GetNaturalSize() to restore ControlSize after relayouting, Scrolling Gap from float...
[platform/core/uifw/dali-toolkit.git] / dali-toolkit / internal / text / text-controller.cpp
index 3d22634..268519b 100644 (file)
@@ -20,6 +20,7 @@
 
 // EXTERNAL INCLUDES
 #include <limits>
+#include <memory.h>
 #include <dali/public-api/adaptor-framework/key.h>
 #include <dali/integration-api/debug.h>
 #include <dali/devel-api/adaptor-framework/clipboard-event-notifier.h>
@@ -28,6 +29,7 @@
 #include <dali-toolkit/internal/text/bidirectional-support.h>
 #include <dali-toolkit/internal/text/character-set-conversion.h>
 #include <dali-toolkit/internal/text/layouts/layout-parameters.h>
+#include <dali-toolkit/internal/text/markup-processor.h>
 #include <dali-toolkit/internal/text/text-controller-impl.h>
 
 namespace
@@ -41,7 +43,6 @@ const float MAX_FLOAT = std::numeric_limits<float>::max();
 const unsigned int POINTS_PER_INCH = 72;
 
 const std::string EMPTY_STRING("");
-const unsigned int ZERO = 0u;
 
 float ConvertToEven( float value )
 {
@@ -60,6 +61,43 @@ namespace Toolkit
 namespace Text
 {
 
+/**
+ * @brief Adds a new font description run for the selected text.
+ *
+ * The new font parameters are added after the call to this method.
+ *
+ * @param[in] eventData The event data pointer.
+ * @param[in] logicalModel The logical model where to add the new font description run.
+ * @param[out] startOfSelectedText Index to the first selected character.
+ * @param[out] lengthOfSelectedText Number of selected characters.
+ */
+FontDescriptionRun& UpdateSelectionFontStyleRun( EventData* eventData,
+                                                 LogicalModelPtr logicalModel,
+                                                 CharacterIndex& startOfSelectedText,
+                                                 Length& lengthOfSelectedText )
+{
+  const bool handlesCrossed = eventData->mLeftSelectionPosition > eventData->mRightSelectionPosition;
+
+  // Get start and end position of selection
+  startOfSelectedText = handlesCrossed ? eventData->mRightSelectionPosition : eventData->mLeftSelectionPosition;
+  lengthOfSelectedText = ( handlesCrossed ? eventData->mLeftSelectionPosition : eventData->mRightSelectionPosition ) - startOfSelectedText;
+
+  // Add the font run.
+  const VectorBase::SizeType numberOfRuns = logicalModel->mFontDescriptionRuns.Count();
+  logicalModel->mFontDescriptionRuns.Resize( numberOfRuns + 1u );
+
+  FontDescriptionRun& fontDescriptionRun = *( logicalModel->mFontDescriptionRuns.Begin() + numberOfRuns );
+
+  fontDescriptionRun.characterRun.characterIndex = startOfSelectedText;
+  fontDescriptionRun.characterRun.numberOfCharacters = lengthOfSelectedText;
+
+  // Recalculate the selection highlight as the metrics may have changed.
+  eventData->mUpdateLeftSelectionPosition = true;
+  eventData->mUpdateRightSelectionPosition = true;
+
+  return fontDescriptionRun;
+}
+
 ControllerPtr Controller::New( ControlInterface& controlInterface )
 {
   return ControllerPtr( new Controller( controlInterface ) );
@@ -67,12 +105,82 @@ ControllerPtr Controller::New( ControlInterface& controlInterface )
 
 void Controller::EnableTextInput( DecoratorPtr decorator )
 {
-  if( !mImpl->mEventData )
+  if( NULL == mImpl->mEventData )
   {
     mImpl->mEventData = new EventData( decorator );
   }
 }
 
+void Controller::SetGlyphType( TextAbstraction::GlyphType glyphType )
+{
+  // Metrics for bitmap & vector based glyphs are different
+  mImpl->mMetrics->SetGlyphType( glyphType );
+
+  // Clear the font-specific data
+  ClearFontData();
+
+  mImpl->RequestRelayout();
+}
+
+void Controller::SetMarkupProcessorEnabled( bool enable )
+{
+  mImpl->mMarkupProcessorEnabled = enable;
+}
+
+bool Controller::IsMarkupProcessorEnabled() const
+{
+  return mImpl->mMarkupProcessorEnabled;
+}
+
+void Controller::SetAutoScrollEnabled( bool enable )
+{
+  DALI_LOG_INFO( gLogFilter, Debug::General, "Controller::SetAutoScrollEnabled[%s] SingleBox[%s]-> [%p]\n", (enable)?"true":"false", ( mImpl->mLayoutEngine.GetLayout() == LayoutEngine::SINGLE_LINE_BOX)?"true":"false", this );
+
+  if ( mImpl->mLayoutEngine.GetLayout() == LayoutEngine::SINGLE_LINE_BOX )
+  {
+    if ( enable )
+    {
+      DALI_LOG_INFO( gLogFilter, Debug::General, "Controller::SetAutoScrollEnabled for SINGLE_LINE_BOX\n" );
+      mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending |
+                                                               LAYOUT                    |
+                                                               ALIGN                     |
+                                                               UPDATE_ACTUAL_SIZE        |
+                                                               UPDATE_DIRECTION          |
+                                                               REORDER );
+
+    }
+    else
+    {
+      DALI_LOG_INFO( gLogFilter, Debug::General, "Controller::SetAutoScrollEnabled Disabling autoscroll\n");
+      mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending |
+                                                               LAYOUT                    |
+                                                               ALIGN                     |
+                                                               UPDATE_ACTUAL_SIZE        |
+                                                               REORDER );
+    }
+
+    mImpl->mAutoScrollEnabled = enable;
+    mImpl->RequestRelayout();
+  }
+  else
+  {
+    DALI_LOG_WARNING( "Attempted AutoScrolling on a non SINGLE_LINE_BOX, request ignored" );
+    mImpl->mAutoScrollEnabled = false;
+  }
+}
+
+bool Controller::IsAutoScrollEnabled() const
+{
+  DALI_LOG_INFO( gLogFilter, Debug::Verbose, "Controller::IsAutoScrollEnabled[%s]\n", (mImpl->mAutoScrollEnabled)?"true":"false" );
+
+  return mImpl->mAutoScrollEnabled;
+}
+
+CharacterDirection Controller::GetAutoScrollDirection() const
+{
+  return mImpl->mAutoScrollDirectionRTL;
+}
+
 void Controller::SetText( const std::string& text )
 {
   DALI_LOG_INFO( gLogFilter, Debug::Verbose, "Controller::SetText\n" );
@@ -80,18 +188,21 @@ void Controller::SetText( const std::string& text )
   // Reset keyboard as text changed
   mImpl->ResetImfManager();
 
-  // Remove the previously set text
+  // Remove the previously set text and style.
   ResetText();
 
+  // Remove the style.
+  ClearStyleData();
+
   CharacterIndex lastCursorIndex = 0u;
 
-  if( mImpl->mEventData )
+  if( NULL != mImpl->mEventData )
   {
     // If popup shown then hide it by switching to Editing state
     if( ( EventData::SELECTING == mImpl->mEventData->mState )          ||
-        ( EventData::SELECTION_CHANGED == mImpl->mEventData->mState )  ||
         ( EventData::EDITING_WITH_POPUP == mImpl->mEventData->mState ) ||
-        ( EventData::EDITING_WITH_GRAB_HANDLE == mImpl->mEventData->mState ) )
+        ( EventData::EDITING_WITH_GRAB_HANDLE == mImpl->mEventData->mState ) ||
+        ( EventData::EDITING_WITH_PASTE_POPUP == mImpl->mEventData->mState ) )
     {
       mImpl->ChangeState( EventData::EDITING );
     }
@@ -99,20 +210,43 @@ void Controller::SetText( const std::string& text )
 
   if( !text.empty() )
   {
+    mImpl->mVisualModel->SetTextColor( mImpl->mTextColor );
+
+    MarkupProcessData markupProcessData( mImpl->mLogicalModel->mColorRuns,
+                                         mImpl->mLogicalModel->mFontDescriptionRuns );
+
+    Length textSize = 0u;
+    const uint8_t* utf8 = NULL;
+    if( mImpl->mMarkupProcessorEnabled )
+    {
+      ProcessMarkupString( text, markupProcessData );
+      textSize = markupProcessData.markupProcessedText.size();
+
+      // This is a bit horrible but std::string returns a (signed) char*
+      utf8 = reinterpret_cast<const uint8_t*>( markupProcessData.markupProcessedText.c_str() );
+    }
+    else
+    {
+      textSize = text.size();
+
+      // This is a bit horrible but std::string returns a (signed) char*
+      utf8 = reinterpret_cast<const uint8_t*>( text.c_str() );
+    }
+
     //  Convert text into UTF-32
     Vector<Character>& utf32Characters = mImpl->mLogicalModel->mText;
-    utf32Characters.Resize( text.size() );
-
-    // This is a bit horrible but std::string returns a (signed) char*
-    const uint8_t* utf8 = reinterpret_cast<const uint8_t*>( text.c_str() );
+    utf32Characters.Resize( textSize );
 
     // Transform a text array encoded in utf8 into an array encoded in utf32.
     // It returns the actual number of characters.
-    Length characterCount = Utf8ToUtf32( utf8, text.size(), utf32Characters.Begin() );
+    Length characterCount = Utf8ToUtf32( utf8, textSize, utf32Characters.Begin() );
     utf32Characters.Resize( characterCount );
 
-    DALI_ASSERT_DEBUG( text.size() >= characterCount && "Invalid UTF32 conversion length" );
-    DALI_LOG_INFO( gLogFilter, Debug::Verbose, "Controller::SetText %p UTF8 size %d, UTF32 size %d\n", this, text.size(), mImpl->mLogicalModel->mText.Count() );
+    DALI_ASSERT_DEBUG( textSize >= characterCount && "Invalid UTF32 conversion length" );
+    DALI_LOG_INFO( gLogFilter, Debug::Verbose, "Controller::SetText %p UTF8 size %d, UTF32 size %d\n", this, textSize, mImpl->mLogicalModel->mText.Count() );
+
+    // The characters to be added.
+    mImpl->mTextUpdateInfo.mNumberOfCharactersToAdd = mImpl->mLogicalModel->mText.Count();
 
     // To reset the cursor position
     lastCursorIndex = characterCount;
@@ -139,7 +273,7 @@ void Controller::SetText( const std::string& text )
 
   mImpl->RequestRelayout();
 
-  if( mImpl->mEventData )
+  if( NULL != mImpl->mEventData )
   {
     // Cancel previously queued events
     mImpl->mEventData->mEventQueue.clear();
@@ -154,7 +288,7 @@ void Controller::SetText( const std::string& text )
 
 void Controller::GetText( std::string& text ) const
 {
-  if( ! mImpl->IsShowingPlaceholderText() )
+  if( !mImpl->IsShowingPlaceholderText() )
   {
     Vector<Character>& utf32Characters = mImpl->mLogicalModel->mText;
 
@@ -171,7 +305,7 @@ void Controller::GetText( std::string& text ) const
 
 unsigned int Controller::GetLogicalCursorPosition() const
 {
-  if( mImpl->mEventData )
+  if( NULL != mImpl->mEventData )
   {
     return mImpl->mEventData->mPrimaryCursorPosition;
   }
@@ -181,7 +315,7 @@ unsigned int Controller::GetLogicalCursorPosition() const
 
 void Controller::SetPlaceholderText( PlaceholderType type, const std::string& text )
 {
-  if( mImpl->mEventData )
+  if( NULL != mImpl->mEventData )
   {
     if( PLACEHOLDER_TYPE_INACTIVE == type )
     {
@@ -194,7 +328,7 @@ void Controller::SetPlaceholderText( PlaceholderType type, const std::string& te
 
     // Update placeholder if there is no text
     if( mImpl->IsShowingPlaceholderText() ||
-        0u == mImpl->mLogicalModel->mText.Count() )
+        ( 0u == mImpl->mLogicalModel->mText.Count() ) )
     {
       ShowPlaceholderText();
     }
@@ -203,7 +337,7 @@ void Controller::SetPlaceholderText( PlaceholderType type, const std::string& te
 
 void Controller::GetPlaceholderText( PlaceholderType type, std::string& text ) const
 {
-  if( mImpl->mEventData )
+  if( NULL != mImpl->mEventData )
   {
     if( PLACEHOLDER_TYPE_INACTIVE == type )
     {
@@ -216,12 +350,9 @@ void Controller::GetPlaceholderText( PlaceholderType type, std::string& text ) c
   }
 }
 
-void Controller::SetMaximumNumberOfCharacters( int maxCharacters )
+void Controller::SetMaximumNumberOfCharacters( Length maxCharacters )
 {
-  if ( maxCharacters >= 0 )
-  {
-    mImpl->mMaximumNumberOfCharacters = maxCharacters;
-  }
+  mImpl->mMaximumNumberOfCharacters = maxCharacters;
 }
 
 int Controller::GetMaximumNumberOfCharacters()
@@ -229,29 +360,26 @@ int Controller::GetMaximumNumberOfCharacters()
   return mImpl->mMaximumNumberOfCharacters;
 }
 
-void Controller::SetDefaultFontFamily( const std::string& defaultFontFamily, bool userDefined )
+void Controller::SetDefaultFontFamily( const std::string& defaultFontFamily )
 {
-  if( !mImpl->mFontDefaults )
+  if( NULL == mImpl->mFontDefaults )
   {
     mImpl->mFontDefaults = new FontDefaults();
   }
 
   mImpl->mFontDefaults->mFontDescription.family = defaultFontFamily;
-  DALI_LOG_INFO( gLogFilter, Debug::General, "Controller::SetDefaultFontFamily %s userDefined: %s\n", defaultFontFamily.c_str(), userDefined ? "true":"false" );
-  mImpl->mUserDefinedFontFamily = userDefined;
+  DALI_LOG_INFO( gLogFilter, Debug::General, "Controller::SetDefaultFontFamily %s\n", defaultFontFamily.c_str());
+  mImpl->mFontDefaults->familyDefined = true;
 
   // Clear the font-specific data
   ClearFontData();
 
-  mImpl->mOperationsPending = ALL_OPERATIONS;
-  mImpl->mRecalculateNaturalSize = true;
-
   mImpl->RequestRelayout();
 }
 
 const std::string& Controller::GetDefaultFontFamily() const
 {
-  if( mImpl->mFontDefaults )
+  if( NULL != mImpl->mFontDefaults )
   {
     return mImpl->mFontDefaults->mFontDescription.family;
   }
@@ -261,7 +389,7 @@ const std::string& Controller::GetDefaultFontFamily() const
 
 void Controller::SetDefaultFontStyle( const std::string& style )
 {
-  if( !mImpl->mFontDefaults )
+  if( NULL == mImpl->mFontDefaults )
   {
     mImpl->mFontDefaults = new FontDefaults();
   }
@@ -271,7 +399,7 @@ void Controller::SetDefaultFontStyle( const std::string& style )
 
 const std::string& Controller::GetDefaultFontStyle() const
 {
-  if( mImpl->mFontDefaults )
+  if( NULL != mImpl->mFontDefaults )
   {
     return mImpl->mFontDefaults->mFontStyle;
   }
@@ -279,83 +407,77 @@ const std::string& Controller::GetDefaultFontStyle() const
   return EMPTY_STRING;
 }
 
-void Controller::SetDefaultFontWidth( FontWidth width )
+void Controller::SetDefaultFontWeight( FontWeight weight )
 {
-  if( !mImpl->mFontDefaults )
+  if( NULL == mImpl->mFontDefaults )
   {
     mImpl->mFontDefaults = new FontDefaults();
   }
 
-  mImpl->mFontDefaults->mFontDescription.width = width;
+  mImpl->mFontDefaults->mFontDescription.weight = weight;
+  mImpl->mFontDefaults->weightDefined = true;
 
   // Clear the font-specific data
   ClearFontData();
 
-  mImpl->mOperationsPending = ALL_OPERATIONS;
-  mImpl->mRecalculateNaturalSize = true;
-
   mImpl->RequestRelayout();
 }
 
-FontWidth Controller::GetDefaultFontWidth() const
+FontWeight Controller::GetDefaultFontWeight() const
 {
-  if( mImpl->mFontDefaults )
+  if( NULL != mImpl->mFontDefaults )
   {
-    return mImpl->mFontDefaults->mFontDescription.width;
+    return mImpl->mFontDefaults->mFontDescription.weight;
   }
 
-  return TextAbstraction::FontWidth::NORMAL;
+  return TextAbstraction::FontWeight::NORMAL;
 }
 
-void Controller::SetDefaultFontWeight( FontWeight weight )
+void Controller::SetDefaultFontWidth( FontWidth width )
 {
-  if( !mImpl->mFontDefaults )
+  if( NULL == mImpl->mFontDefaults )
   {
     mImpl->mFontDefaults = new FontDefaults();
   }
 
-  mImpl->mFontDefaults->mFontDescription.weight = weight;
+  mImpl->mFontDefaults->mFontDescription.width = width;
+  mImpl->mFontDefaults->widthDefined = true;
 
   // Clear the font-specific data
   ClearFontData();
 
-  mImpl->mOperationsPending = ALL_OPERATIONS;
-  mImpl->mRecalculateNaturalSize = true;
-
   mImpl->RequestRelayout();
 }
 
-FontWeight Controller::GetDefaultFontWeight() const
+FontWidth Controller::GetDefaultFontWidth() const
 {
-  if( mImpl->mFontDefaults )
+  if( NULL != mImpl->mFontDefaults )
   {
-    return mImpl->mFontDefaults->mFontDescription.weight;
+    return mImpl->mFontDefaults->mFontDescription.width;
   }
 
-  return TextAbstraction::FontWeight::NORMAL;
+  return TextAbstraction::FontWidth::NORMAL;
 }
 
 void Controller::SetDefaultFontSlant( FontSlant slant )
 {
-  if( !mImpl->mFontDefaults )
+  if( NULL == mImpl->mFontDefaults )
   {
     mImpl->mFontDefaults = new FontDefaults();
   }
 
   mImpl->mFontDefaults->mFontDescription.slant = slant;
+  mImpl->mFontDefaults->slantDefined = true;
 
   // Clear the font-specific data
   ClearFontData();
 
-  mImpl->mOperationsPending = ALL_OPERATIONS;
-  mImpl->mRecalculateNaturalSize = true;
-
   mImpl->RequestRelayout();
 }
 
 FontSlant Controller::GetDefaultFontSlant() const
 {
-  if( mImpl->mFontDefaults )
+  if( NULL != mImpl->mFontDefaults )
   {
     return mImpl->mFontDefaults->mFontDescription.slant;
   }
@@ -365,12 +487,13 @@ FontSlant Controller::GetDefaultFontSlant() const
 
 void Controller::SetDefaultPointSize( float pointSize )
 {
-  if( !mImpl->mFontDefaults )
+  if( NULL == mImpl->mFontDefaults )
   {
     mImpl->mFontDefaults = new FontDefaults();
   }
 
   mImpl->mFontDefaults->mDefaultPointSize = pointSize;
+  mImpl->mFontDefaults->sizeDefined = true;
 
   unsigned int horizontalDpi( 0u );
   unsigned int verticalDpi( 0u );
@@ -384,15 +507,12 @@ void Controller::SetDefaultPointSize( float pointSize )
   // Clear the font-specific data
   ClearFontData();
 
-  mImpl->mOperationsPending = ALL_OPERATIONS;
-  mImpl->mRecalculateNaturalSize = true;
-
   mImpl->RequestRelayout();
 }
 
 float Controller::GetDefaultPointSize() const
 {
-  if( mImpl->mFontDefaults )
+  if( NULL != mImpl->mFontDefaults )
   {
     return mImpl->mFontDefaults->mDefaultPointSize;
   }
@@ -400,18 +520,17 @@ float Controller::GetDefaultPointSize() const
   return 0.0f;
 }
 
-void Controller::UpdateAfterFontChange( std::string& newDefaultFont )
+void Controller::UpdateAfterFontChange( const std::string& newDefaultFont )
 {
-  DALI_LOG_INFO( gLogFilter, Debug::Concise, "Controller::UpdateAfterFontChange");
+  DALI_LOG_INFO( gLogFilter, Debug::Verbose, "Controller::UpdateAfterFontChange");
 
-  if ( !mImpl->mUserDefinedFontFamily ) // If user defined font then should not update when system font changes
+  if( !mImpl->mFontDefaults->familyDefined ) // If user defined font then should not update when system font changes
   {
     DALI_LOG_INFO( gLogFilter, Debug::Concise, "Controller::UpdateAfterFontChange newDefaultFont(%s)\n", newDefaultFont.c_str() );
-    ClearFontData();
     mImpl->mFontDefaults->mFontDescription.family = newDefaultFont;
-    mImpl->UpdateModel( ALL_OPERATIONS );
-    mImpl->QueueModifyEvent( ModifyEvent::TEXT_REPLACED );
-    mImpl->mRecalculateNaturalSize = true;
+
+    ClearFontData();
+
     mImpl->RequestRelayout();
   }
 }
@@ -433,12 +552,19 @@ const Vector4& Controller::GetTextColor() const
   return mImpl->mTextColor;
 }
 
-bool Controller::RemoveText( int cursorOffset, int numberOfChars )
+bool Controller::RemoveText( int cursorOffset,
+                             int numberOfCharacters,
+                             UpdateInputStyleType type )
 {
-  bool removed( false );
+  bool removed = false;
 
-  DALI_LOG_INFO( gLogFilter, Debug::General, "Controller::RemoveText %p mText.Count() %d cursor %d cursorOffset %d numberOfChars %d\n",
-                 this, mImpl->mLogicalModel->mText.Count(), mImpl->mEventData->mPrimaryCursorPosition, cursorOffset, numberOfChars );
+  if( NULL == mImpl->mEventData )
+  {
+    return removed;
+  }
+
+  DALI_LOG_INFO( gLogFilter, Debug::General, "Controller::RemoveText %p mText.Count() %d cursor %d cursorOffset %d numberOfCharacters %d\n",
+                 this, mImpl->mLogicalModel->mText.Count(), mImpl->mEventData->mPrimaryCursorPosition, cursorOffset, numberOfCharacters );
 
   if( !mImpl->IsShowingPlaceholderText() )
   {
@@ -454,22 +580,41 @@ bool Controller::RemoveText( int cursorOffset, int numberOfChars )
       cursorIndex = oldCursorIndex + cursorOffset;
     }
 
-    if( (cursorIndex + numberOfChars) > currentText.Count() )
+    if( ( cursorIndex + numberOfCharacters ) > currentText.Count() )
     {
-      numberOfChars = currentText.Count() - cursorIndex;
+      numberOfCharacters = currentText.Count() - cursorIndex;
     }
 
-    if( (cursorIndex + numberOfChars) <= currentText.Count() )
+    if( ( cursorIndex + numberOfCharacters ) <= mImpl->mTextUpdateInfo.mPreviousNumberOfCharacters )
     {
+      // Mark the paragraphs to be updated.
+      mImpl->mTextUpdateInfo.mCharacterIndex = std::min( cursorIndex, mImpl->mTextUpdateInfo.mCharacterIndex );
+      mImpl->mTextUpdateInfo.mNumberOfCharactersToRemove += numberOfCharacters;
+
+      // Update the input style and remove the text's style before removing the text.
+
+      if( UPDATE_INPUT_STYLE == type )
+      {
+        // Set first the default input style.
+        mImpl->RetrieveDefaultInputStyle( mImpl->mEventData->mInputStyle );
+
+        // Update the input style.
+        mImpl->mLogicalModel->RetrieveStyle( cursorIndex, mImpl->mEventData->mInputStyle );
+      }
+
+      // Updates the text style runs by removing characters. Runs with no characters are removed.
+      mImpl->mLogicalModel->UpdateTextStyleRuns( cursorIndex, -numberOfCharacters );
+
+      // Remove the characters.
       Vector<Character>::Iterator first = currentText.Begin() + cursorIndex;
-      Vector<Character>::Iterator last  = first + numberOfChars;
+      Vector<Character>::Iterator last  = first + numberOfCharacters;
 
       currentText.Erase( first, last );
 
       // Cursor position retreat
       oldCursorIndex = cursorIndex;
 
-      DALI_LOG_INFO( gLogFilter, Debug::General, "Controller::RemoveText %p removed %d\n", this, numberOfChars );
+      DALI_LOG_INFO( gLogFilter, Debug::General, "Controller::RemoveText %p removed %d\n", this, numberOfCharacters );
       removed = true;
     }
   }
@@ -479,7 +624,7 @@ bool Controller::RemoveText( int cursorOffset, int numberOfChars )
 
 void Controller::SetPlaceholderTextColor( const Vector4& textColor )
 {
-  if( mImpl->mEventData )
+  if( NULL != mImpl->mEventData )
   {
     mImpl->mEventData->mPlaceholderTextColor = textColor;
   }
@@ -493,7 +638,7 @@ void Controller::SetPlaceholderTextColor( const Vector4& textColor )
 
 const Vector4& Controller::GetPlaceholderTextColor() const
 {
-  if( mImpl->mEventData )
+  if( NULL != mImpl->mEventData )
   {
     return mImpl->mEventData->mPlaceholderTextColor;
   }
@@ -561,11 +706,347 @@ float Controller::GetUnderlineHeight() const
   return mImpl->mVisualModel->GetUnderlineHeight();
 }
 
+void Controller::SetInputColor( const Vector4& color )
+{
+  if( NULL != mImpl->mEventData )
+  {
+    mImpl->mEventData->mInputStyle.textColor = color;
+    mImpl->mEventData->mInputStyle.isDefaultColor = false;
+
+    if( EventData::SELECTING == mImpl->mEventData->mState )
+    {
+      const bool handlesCrossed = mImpl->mEventData->mLeftSelectionPosition > mImpl->mEventData->mRightSelectionPosition;
+
+      // Get start and end position of selection
+      const CharacterIndex startOfSelectedText = handlesCrossed ? mImpl->mEventData->mRightSelectionPosition : mImpl->mEventData->mLeftSelectionPosition;
+      const Length lengthOfSelectedText = ( handlesCrossed ? mImpl->mEventData->mLeftSelectionPosition : mImpl->mEventData->mRightSelectionPosition ) - startOfSelectedText;
+
+      // Add the color run.
+      const VectorBase::SizeType numberOfRuns = mImpl->mLogicalModel->mColorRuns.Count();
+      mImpl->mLogicalModel->mColorRuns.Resize( numberOfRuns + 1u );
+
+      ColorRun& colorRun = *( mImpl->mLogicalModel->mColorRuns.Begin() + numberOfRuns );
+      colorRun.color = color;
+      colorRun.characterRun.characterIndex = startOfSelectedText;
+      colorRun.characterRun.numberOfCharacters = lengthOfSelectedText;
+
+      // Request to relayout.
+      mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending | COLOR );
+      mImpl->RequestRelayout();
+
+      mImpl->mTextUpdateInfo.mCharacterIndex = startOfSelectedText;
+      mImpl->mTextUpdateInfo.mNumberOfCharactersToRemove = lengthOfSelectedText;
+      mImpl->mTextUpdateInfo.mNumberOfCharactersToAdd = lengthOfSelectedText;
+    }
+  }
+}
+
+const Vector4& Controller::GetInputColor() const
+{
+  if( NULL != mImpl->mEventData )
+  {
+    return mImpl->mEventData->mInputStyle.textColor;
+  }
+
+  // Return the default text's color if there is no EventData.
+  return mImpl->mTextColor;
+
+}
+
+void Controller::SetInputFontFamily( const std::string& fontFamily )
+{
+  if( NULL != mImpl->mEventData )
+  {
+    mImpl->mEventData->mInputStyle.familyName = fontFamily;
+    mImpl->mEventData->mInputStyle.familyDefined = true;
+
+    if( EventData::SELECTING == mImpl->mEventData->mState )
+    {
+      CharacterIndex startOfSelectedText = 0u;
+      Length lengthOfSelectedText = 0u;
+      FontDescriptionRun& fontDescriptionRun = UpdateSelectionFontStyleRun( mImpl->mEventData,
+                                                                            mImpl->mLogicalModel,
+                                                                            startOfSelectedText,
+                                                                            lengthOfSelectedText );
+
+      fontDescriptionRun.familyLength = fontFamily.size();
+      fontDescriptionRun.familyName = new char[fontDescriptionRun.familyLength];
+      memcpy( fontDescriptionRun.familyName, fontFamily.c_str(), fontDescriptionRun.familyLength );
+      fontDescriptionRun.familyDefined = true;
+
+      // The memory allocated for the font family name is freed when the font description is removed from the logical model.
+
+      // Request to relayout.
+      mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending |
+                                                               VALIDATE_FONTS            |
+                                                               SHAPE_TEXT                |
+                                                               GET_GLYPH_METRICS         |
+                                                               LAYOUT                    |
+                                                               UPDATE_ACTUAL_SIZE        |
+                                                               REORDER                   |
+                                                               ALIGN );
+      mImpl->mRecalculateNaturalSize = true;
+      mImpl->RequestRelayout();
+
+      mImpl->mTextUpdateInfo.mCharacterIndex = startOfSelectedText;
+      mImpl->mTextUpdateInfo.mNumberOfCharactersToRemove = lengthOfSelectedText;
+      mImpl->mTextUpdateInfo.mNumberOfCharactersToAdd = lengthOfSelectedText;
+
+      // As the font changes, recalculate the handle positions is needed.
+      mImpl->mEventData->mUpdateLeftSelectionPosition = true;
+      mImpl->mEventData->mUpdateRightSelectionPosition = true;
+      mImpl->mEventData->mScrollAfterUpdatePosition = true;
+    }
+  }
+}
+
+const std::string& Controller::GetInputFontFamily() const
+{
+  if( NULL != mImpl->mEventData )
+  {
+    return mImpl->mEventData->mInputStyle.familyName;
+  }
+
+  // Return the default font's family if there is no EventData.
+  return GetDefaultFontFamily();
+}
+
+void Controller::SetInputFontStyle( const std::string& fontStyle )
+{
+  if( NULL != mImpl->mEventData )
+  {
+    mImpl->mEventData->mInputStyle.fontStyle = fontStyle;
+  }
+}
+
+const std::string& Controller::GetInputFontStyle() const
+{
+  if( NULL != mImpl->mEventData )
+  {
+    return mImpl->mEventData->mInputStyle.fontStyle;
+  }
+
+  // Return the default font's style if there is no EventData.
+  return GetDefaultFontStyle();
+}
+
+void Controller::SetInputFontWeight( FontWeight weight )
+{
+  if( NULL != mImpl->mEventData )
+  {
+    mImpl->mEventData->mInputStyle.weight = weight;
+    mImpl->mEventData->mInputStyle.weightDefined = true;
+
+    if( EventData::SELECTING == mImpl->mEventData->mState )
+    {
+      CharacterIndex startOfSelectedText = 0u;
+      Length lengthOfSelectedText = 0u;
+      FontDescriptionRun& fontDescriptionRun = UpdateSelectionFontStyleRun( mImpl->mEventData,
+                                                                            mImpl->mLogicalModel,
+                                                                            startOfSelectedText,
+                                                                            lengthOfSelectedText );
+
+      fontDescriptionRun.weight = weight;
+      fontDescriptionRun.weightDefined = true;
+
+      // Request to relayout.
+      mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending |
+                                                               VALIDATE_FONTS            |
+                                                               SHAPE_TEXT                |
+                                                               GET_GLYPH_METRICS         |
+                                                               LAYOUT                    |
+                                                               UPDATE_ACTUAL_SIZE        |
+                                                               REORDER                   |
+                                                               ALIGN );
+      mImpl->mRecalculateNaturalSize = true;
+      mImpl->RequestRelayout();
+
+      mImpl->mTextUpdateInfo.mCharacterIndex = startOfSelectedText;
+      mImpl->mTextUpdateInfo.mNumberOfCharactersToRemove = lengthOfSelectedText;
+      mImpl->mTextUpdateInfo.mNumberOfCharactersToAdd = lengthOfSelectedText;
+
+      // As the font might change, recalculate the handle positions is needed.
+      mImpl->mEventData->mUpdateLeftSelectionPosition = true;
+      mImpl->mEventData->mUpdateRightSelectionPosition = true;
+      mImpl->mEventData->mScrollAfterUpdatePosition = true;
+    }
+  }
+}
+
+FontWeight Controller::GetInputFontWeight() const
+{
+  if( NULL != mImpl->mEventData )
+  {
+    return mImpl->mEventData->mInputStyle.weight;
+  }
+
+  return GetDefaultFontWeight();
+}
+
+void Controller::SetInputFontWidth( FontWidth width )
+{
+  if( NULL != mImpl->mEventData )
+  {
+    mImpl->mEventData->mInputStyle.width = width;
+    mImpl->mEventData->mInputStyle.widthDefined = true;
+
+    if( EventData::SELECTING == mImpl->mEventData->mState )
+    {
+      CharacterIndex startOfSelectedText = 0u;
+      Length lengthOfSelectedText = 0u;
+      FontDescriptionRun& fontDescriptionRun = UpdateSelectionFontStyleRun( mImpl->mEventData,
+                                                                            mImpl->mLogicalModel,
+                                                                            startOfSelectedText,
+                                                                            lengthOfSelectedText );
+
+      fontDescriptionRun.width = width;
+      fontDescriptionRun.widthDefined = true;
+
+      // Request to relayout.
+      mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending |
+                                                               VALIDATE_FONTS            |
+                                                               SHAPE_TEXT                |
+                                                               GET_GLYPH_METRICS         |
+                                                               LAYOUT                    |
+                                                               UPDATE_ACTUAL_SIZE        |
+                                                               REORDER                   |
+                                                               ALIGN );
+      mImpl->mRecalculateNaturalSize = true;
+      mImpl->RequestRelayout();
+
+      mImpl->mTextUpdateInfo.mCharacterIndex = startOfSelectedText;
+      mImpl->mTextUpdateInfo.mNumberOfCharactersToRemove = lengthOfSelectedText;
+      mImpl->mTextUpdateInfo.mNumberOfCharactersToAdd = lengthOfSelectedText;
+
+      // As the font might change, recalculate the handle positions is needed.
+      mImpl->mEventData->mUpdateLeftSelectionPosition = true;
+      mImpl->mEventData->mUpdateRightSelectionPosition = true;
+      mImpl->mEventData->mScrollAfterUpdatePosition = true;
+    }
+  }
+}
+
+FontWidth Controller::GetInputFontWidth() const
+{
+  if( NULL != mImpl->mEventData )
+  {
+    return mImpl->mEventData->mInputStyle.width;
+  }
+
+  return GetDefaultFontWidth();
+}
+
+void Controller::SetInputFontSlant( FontSlant slant )
+{
+  if( NULL != mImpl->mEventData )
+  {
+    mImpl->mEventData->mInputStyle.slant = slant;
+    mImpl->mEventData->mInputStyle.slantDefined = true;
+
+    if( EventData::SELECTING == mImpl->mEventData->mState )
+    {
+      CharacterIndex startOfSelectedText = 0u;
+      Length lengthOfSelectedText = 0u;
+      FontDescriptionRun& fontDescriptionRun = UpdateSelectionFontStyleRun( mImpl->mEventData,
+                                                                            mImpl->mLogicalModel,
+                                                                            startOfSelectedText,
+                                                                            lengthOfSelectedText );
+
+      fontDescriptionRun.slant = slant;
+      fontDescriptionRun.slantDefined = true;
+
+      // Request to relayout.
+      mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending |
+                                                               VALIDATE_FONTS            |
+                                                               SHAPE_TEXT                |
+                                                               GET_GLYPH_METRICS         |
+                                                               LAYOUT                    |
+                                                               UPDATE_ACTUAL_SIZE        |
+                                                               REORDER                   |
+                                                               ALIGN );
+      mImpl->mRecalculateNaturalSize = true;
+      mImpl->RequestRelayout();
+
+      mImpl->mTextUpdateInfo.mCharacterIndex = startOfSelectedText;
+      mImpl->mTextUpdateInfo.mNumberOfCharactersToRemove = lengthOfSelectedText;
+      mImpl->mTextUpdateInfo.mNumberOfCharactersToAdd = lengthOfSelectedText;
+
+      // As the font might change, recalculate the handle positions is needed.
+      mImpl->mEventData->mUpdateLeftSelectionPosition = true;
+      mImpl->mEventData->mUpdateRightSelectionPosition = true;
+      mImpl->mEventData->mScrollAfterUpdatePosition = true;
+    }
+  }
+}
+
+FontSlant Controller::GetInputFontSlant() const
+{
+  if( NULL != mImpl->mEventData )
+  {
+    return mImpl->mEventData->mInputStyle.slant;
+  }
+
+  return GetDefaultFontSlant();
+}
+
+void Controller::SetInputFontPointSize( float size )
+{
+  if( NULL != mImpl->mEventData )
+  {
+    mImpl->mEventData->mInputStyle.size = size;
+
+    if( EventData::SELECTING == mImpl->mEventData->mState )
+    {
+      CharacterIndex startOfSelectedText = 0u;
+      Length lengthOfSelectedText = 0u;
+      FontDescriptionRun& fontDescriptionRun = UpdateSelectionFontStyleRun( mImpl->mEventData,
+                                                                            mImpl->mLogicalModel,
+                                                                            startOfSelectedText,
+                                                                            lengthOfSelectedText );
+
+      fontDescriptionRun.size = static_cast<PointSize26Dot6>( size * 64.f );
+      fontDescriptionRun.sizeDefined = true;
+
+      // Request to relayout.
+      mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending |
+                                                               VALIDATE_FONTS            |
+                                                               SHAPE_TEXT                |
+                                                               GET_GLYPH_METRICS         |
+                                                               LAYOUT                    |
+                                                               UPDATE_ACTUAL_SIZE        |
+                                                               REORDER                   |
+                                                               ALIGN );
+      mImpl->mRecalculateNaturalSize = true;
+      mImpl->RequestRelayout();
+
+      mImpl->mTextUpdateInfo.mCharacterIndex = startOfSelectedText;
+      mImpl->mTextUpdateInfo.mNumberOfCharactersToRemove = lengthOfSelectedText;
+      mImpl->mTextUpdateInfo.mNumberOfCharactersToAdd = lengthOfSelectedText;
+
+      // As the font might change, recalculate the handle positions is needed.
+      mImpl->mEventData->mUpdateLeftSelectionPosition = true;
+      mImpl->mEventData->mUpdateRightSelectionPosition = true;
+      mImpl->mEventData->mScrollAfterUpdatePosition = true;
+    }
+  }
+}
+
+float Controller::GetInputFontPointSize() const
+{
+  if( NULL != mImpl->mEventData )
+  {
+    return mImpl->mEventData->mInputStyle.size;
+  }
+
+  // Return the default font's point size if there is no EventData.
+  return GetDefaultPointSize();
+}
+
 void Controller::SetEnableCursorBlink( bool enable )
 {
   DALI_ASSERT_DEBUG( NULL != mImpl->mEventData && "TextInput disabled" );
 
-  if( mImpl->mEventData )
+  if( NULL != mImpl->mEventData )
   {
     mImpl->mEventData->mCursorBlinkEnabled = enable;
 
@@ -579,7 +1060,7 @@ void Controller::SetEnableCursorBlink( bool enable )
 
 bool Controller::GetEnableCursorBlink() const
 {
-  if( mImpl->mEventData )
+  if( NULL != mImpl->mEventData )
   {
     return mImpl->mEventData->mCursorBlinkEnabled;
   }
@@ -589,7 +1070,7 @@ bool Controller::GetEnableCursorBlink() const
 
 const Vector2& Controller::GetScrollPosition() const
 {
-  if( mImpl->mEventData )
+  if( NULL != mImpl->mEventData )
   {
     return mImpl->mEventData->mScrollPosition;
   }
@@ -624,20 +1105,28 @@ Vector3 Controller::GetNaturalSize()
     // Make sure the model is up-to-date before layouting
     mImpl->UpdateModel( onlyOnceOperations );
 
-    // Operations that need to be done if the size changes.
-    const OperationsMask sizeOperations =  static_cast<OperationsMask>( LAYOUT |
-                                                                        ALIGN  |
-                                                                        REORDER );
+    // Layout the text for the new width.
+    mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending | LAYOUT );
+
+    // Set the update info to relayout the whole text.
+    mImpl->mTextUpdateInfo.mParagraphCharacterIndex = 0u;
+    mImpl->mTextUpdateInfo.mRequestedNumberOfCharacters = mImpl->mLogicalModel->mText.Count();
+
+    // Store the actual control's size to restore later.
+    const Size actualControlSize = mImpl->mVisualModel->mControlSize;
 
     DoRelayout( Size( MAX_FLOAT, MAX_FLOAT ),
                 static_cast<OperationsMask>( onlyOnceOperations |
-                                             sizeOperations ),
+                                             LAYOUT ),
                 naturalSize.GetVectorXY() );
 
     // Do not do again the only once operations.
     mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending & ~onlyOnceOperations );
 
     // Do the size related operations again.
+    const OperationsMask sizeOperations =  static_cast<OperationsMask>( LAYOUT |
+                                                                        ALIGN  |
+                                                                        REORDER );
     mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending | sizeOperations );
 
     // Stores the natural size to avoid recalculate it again
@@ -646,6 +1135,12 @@ Vector3 Controller::GetNaturalSize()
 
     mImpl->mRecalculateNaturalSize = false;
 
+    // Clear the update info. This info will be set the next time the text is updated.
+    mImpl->mTextUpdateInfo.Clear();
+
+    // Restore the actual control's size.
+    mImpl->mVisualModel->mControlSize = actualControlSize;
+
     DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--Controller::GetNaturalSize calculated %f,%f,%f\n", naturalSize.x, naturalSize.y, naturalSize.z );
   }
   else
@@ -668,7 +1163,7 @@ float Controller::GetHeightForWidth( float width )
   ProcessModifyEvents();
 
   Size layoutSize;
-  if( width != mImpl->mVisualModel->mControlSize.width )
+  if( fabsf( width - mImpl->mVisualModel->mControlSize.width ) > Math::MACHINE_EPSILON_1000 )
   {
     // Operations that can be done only once until the text changes.
     const OperationsMask onlyOnceOperations = static_cast<OperationsMask>( CONVERT_TO_UTF32  |
@@ -682,26 +1177,43 @@ float Controller::GetHeightForWidth( float width )
     // Make sure the model is up-to-date before layouting
     mImpl->UpdateModel( onlyOnceOperations );
 
-    // Operations that need to be done if the size changes.
-    const OperationsMask sizeOperations =  static_cast<OperationsMask>( LAYOUT |
-                                                                        ALIGN  |
-                                                                        REORDER );
+
+    // Layout the text for the new width.
+    mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending | LAYOUT );
+
+    // Set the update info to relayout the whole text.
+    mImpl->mTextUpdateInfo.mParagraphCharacterIndex = 0u;
+    mImpl->mTextUpdateInfo.mRequestedNumberOfCharacters = mImpl->mLogicalModel->mText.Count();
+
+    // Store the actual control's width.
+    const float actualControlWidth = mImpl->mVisualModel->mControlSize.width;
 
     DoRelayout( Size( width, MAX_FLOAT ),
                 static_cast<OperationsMask>( onlyOnceOperations |
-                                             sizeOperations ),
+                                             LAYOUT ),
                 layoutSize );
 
     // Do not do again the only once operations.
     mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending & ~onlyOnceOperations );
 
     // Do the size related operations again.
+    const OperationsMask sizeOperations =  static_cast<OperationsMask>( LAYOUT |
+                                                                        ALIGN  |
+                                                                        REORDER );
+
     mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending | sizeOperations );
+
+    // Clear the update info. This info will be set the next time the text is updated.
+    mImpl->mTextUpdateInfo.Clear();
+
+    // Restore the actual control's width.
+    mImpl->mVisualModel->mControlSize.width = actualControlWidth;
+
     DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--Controller::GetHeightForWidth calculated %f\n", layoutSize.height );
   }
   else
   {
-    layoutSize = mImpl->mVisualModel->GetActualSize();
+    layoutSize = mImpl->mVisualModel->GetLayoutSize();
     DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--Controller::GetHeightForWidth cached %f\n", layoutSize.height );
   }
 
@@ -710,7 +1222,7 @@ float Controller::GetHeightForWidth( float width )
 
 bool Controller::Relayout( const Size& size )
 {
-  DALI_LOG_INFO( gLogFilter, Debug::Verbose, "-->Controller::Relayout %p size %f,%f\n", this, size.width, size.height );
+  DALI_LOG_INFO( gLogFilter, Debug::Verbose, "-->Controller::Relayout %p size %f,%f, autoScroll[%s]\n", this, size.width, size.height, (mImpl->mAutoScrollEnabled)?"true":"false"  );
 
   if( ( size.width < Math::MACHINE_EPSILON_1000 ) || ( size.height < Math::MACHINE_EPSILON_1000 ) )
   {
@@ -720,40 +1232,61 @@ bool Controller::Relayout( const Size& size )
       mImpl->mVisualModel->mGlyphPositions.Clear();
       glyphsRemoved = true;
     }
+
+    // Clear the update info. This info will be set the next time the text is updated.
+    mImpl->mTextUpdateInfo.Clear();
+
     // Not worth to relayout if width or height is equal to zero.
     DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--Controller::Relayout (skipped)\n" );
+
     return glyphsRemoved;
   }
 
-  if( size != mImpl->mVisualModel->mControlSize )
+  // Whether a new size has been set.
+  const bool newSize = ( size != mImpl->mVisualModel->mControlSize );
+
+  if( newSize )
   {
     DALI_LOG_INFO( gLogFilter, Debug::Verbose, "new size (previous size %f,%f)\n", mImpl->mVisualModel->mControlSize.width, mImpl->mVisualModel->mControlSize.height );
 
-    // Operations that need to be done if the size changes.
+    // Layout operations that need to be done if the size changes.
     mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending |
                                                              LAYOUT                    |
                                                              ALIGN                     |
                                                              UPDATE_ACTUAL_SIZE        |
                                                              REORDER );
+    // Set the update info to relayout the whole text.
+    mImpl->mTextUpdateInfo.mFullRelayoutNeeded = true;
+    mImpl->mTextUpdateInfo.mCharacterIndex = 0u;
+  }
 
-    mImpl->mVisualModel->mControlSize = size;
+  // Whether there are modify events.
+  if( 0u != mImpl->mModifyEvents.Count() )
+  {
+    // Style operations that need to be done if the text is modified.
+    mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending |
+                                                             COLOR );
   }
 
-  // Make sure the model is up-to-date before layouting
+  // Make sure the model is up-to-date before layouting.
   ProcessModifyEvents();
-  mImpl->UpdateModel( mImpl->mOperationsPending );
+  bool updated = mImpl->UpdateModel( mImpl->mOperationsPending );
 
+  // Layout the text.
   Size layoutSize;
-  bool updated = DoRelayout( mImpl->mVisualModel->mControlSize,
-                             mImpl->mOperationsPending,
-                             layoutSize );
+  updated = DoRelayout( size,
+                        mImpl->mOperationsPending,
+                        layoutSize ) || updated;
 
   // Do not re-do any operation until something changes.
   mImpl->mOperationsPending = NO_OPERATION;
 
-  // Keep the current offset and alignment as it will be used to update the decorator's positions.
+  // Whether the text control is editable
+  const bool isEditable = NULL != mImpl->mEventData;
+
+  // Keep the current offset and alignment as it will be used to update the decorator's positions (if the size changes).
   Vector2 offset;
-  if( mImpl->mEventData )
+  if( newSize && isEditable )
   {
     offset = mImpl->mAlignmentOffset + mImpl->mEventData->mScrollPosition;
   }
@@ -761,40 +1294,57 @@ bool Controller::Relayout( const Size& size )
   // After doing the text layout, the alignment offset to place the actor in the desired position can be calculated.
   CalculateTextAlignment( size );
 
-  if( mImpl->mEventData )
+  if( isEditable )
   {
-    // If there is a nex size, the scroll position needs to be clamped.
-    mImpl->ClampHorizontalScroll( layoutSize );
+    if( newSize )
+    {
+      // If there is a new size, the scroll position needs to be clamped.
+      mImpl->ClampHorizontalScroll( layoutSize );
 
-    // Update the decorator's positions.
-    mImpl->mEventData->mDecorator->UpdatePositions( mImpl->mAlignmentOffset + mImpl->mEventData->mScrollPosition - offset );
+      // Update the decorator's positions is needed if there is a new size.
+      mImpl->mEventData->mDecorator->UpdatePositions( mImpl->mAlignmentOffset + mImpl->mEventData->mScrollPosition - offset );
+    }
 
     // Move the cursor, grab handle etc.
     updated = mImpl->ProcessInputEvents() || updated;
   }
 
+  // Clear the update info. This info will be set the next time the text is updated.
+  mImpl->mTextUpdateInfo.Clear();
   DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--Controller::Relayout\n" );
+
   return updated;
 }
 
 void Controller::ProcessModifyEvents()
 {
-  std::vector<ModifyEvent>& events = mImpl->mModifyEvents;
+  Vector<ModifyEvent>& events = mImpl->mModifyEvents;
 
-  for( unsigned int i=0; i<events.size(); ++i )
+  if( 0u == events.Count() )
   {
-    if( ModifyEvent::TEXT_REPLACED == events[0].type )
+    // Nothing to do.
+    return;
+  }
+
+  for( Vector<ModifyEvent>::ConstIterator it = events.Begin(),
+         endIt = events.End();
+       it != endIt;
+       ++it )
+  {
+    const ModifyEvent& event = *it;
+
+    if( ModifyEvent::TEXT_REPLACED == event.type )
     {
       // A (single) replace event should come first, otherwise we wasted time processing NOOP events
-      DALI_ASSERT_DEBUG( 0 == i && "Unexpected TEXT_REPLACED event" );
+      DALI_ASSERT_DEBUG( it == events.Begin() && "Unexpected TEXT_REPLACED event" );
 
       TextReplacedEvent();
     }
-    else if( ModifyEvent::TEXT_INSERTED == events[0].type )
+    else if( ModifyEvent::TEXT_INSERTED == event.type )
     {
       TextInsertedEvent();
     }
-    else if( ModifyEvent::TEXT_DELETED == events[0].type )
+    else if( ModifyEvent::TEXT_DELETED == event.type )
     {
       // Placeholder-text cannot be deleted
       if( !mImpl->IsShowingPlaceholderText() )
@@ -804,26 +1354,31 @@ void Controller::ProcessModifyEvents()
     }
   }
 
-  if( mImpl->mEventData &&
-      0 != events.size() )
+  if( NULL != mImpl->mEventData )
   {
     // When the text is being modified, delay cursor blinking
     mImpl->mEventData->mDecorator->DelayCursorBlink();
   }
 
   // Discard temporary text
-  events.clear();
+  events.Clear();
 }
 
 void Controller::ResetText()
 {
   // Reset buffers.
   mImpl->mLogicalModel->mText.Clear();
-  ClearModelData();
 
   // We have cleared everything including the placeholder-text
   mImpl->PlaceholderCleared();
 
+  mImpl->mTextUpdateInfo.mCharacterIndex = 0u;
+  mImpl->mTextUpdateInfo.mNumberOfCharactersToRemove = mImpl->mTextUpdateInfo.mPreviousNumberOfCharacters;
+  mImpl->mTextUpdateInfo.mNumberOfCharactersToAdd = 0u;
+
+  // Clear any previous text.
+  mImpl->mTextUpdateInfo.mClearAll = true;
+
   // The natural size needs to be re-calculated.
   mImpl->mRecalculateNaturalSize = true;
 
@@ -839,9 +1394,7 @@ void Controller::ResetCursorPosition( CharacterIndex cursorIndex )
     mImpl->mEventData->mPrimaryCursorPosition = cursorIndex;
 
     // Update the cursor if it's in editing mode.
-    if( ( EventData::EDITING == mImpl->mEventData->mState )            ||
-        ( EventData::EDITING_WITH_POPUP == mImpl->mEventData->mState ) ||
-        ( EventData::EDITING_WITH_GRAB_HANDLE == mImpl->mEventData->mState ) )
+    if( EventData::IsEditingState( mImpl->mEventData->mState )  )
     {
       mImpl->mEventData->mUpdateCursorPosition = true;
     }
@@ -860,43 +1413,30 @@ void Controller::ResetScrollPosition()
 
 void Controller::TextReplacedEvent()
 {
-  // Reset buffers.
-  ClearModelData();
-
   // The natural size needs to be re-calculated.
   mImpl->mRecalculateNaturalSize = true;
 
   // Apply modifications to the model
   mImpl->mOperationsPending = ALL_OPERATIONS;
-  mImpl->UpdateModel( ALL_OPERATIONS );
-  mImpl->mOperationsPending = static_cast<OperationsMask>( LAYOUT             |
-                                                           ALIGN              |
-                                                           UPDATE_ACTUAL_SIZE |
-                                                           REORDER );
 }
 
 void Controller::TextInsertedEvent()
 {
   DALI_ASSERT_DEBUG( NULL != mImpl->mEventData && "Unexpected TextInsertedEvent" );
 
-  // TODO - Optimize this
-  ClearModelData();
+  if( NULL == mImpl->mEventData )
+  {
+    return;
+  }
 
   // The natural size needs to be re-calculated.
   mImpl->mRecalculateNaturalSize = true;
 
   // Apply modifications to the model; TODO - Optimize this
   mImpl->mOperationsPending = ALL_OPERATIONS;
-  mImpl->UpdateModel( ALL_OPERATIONS );
-  mImpl->mOperationsPending = static_cast<OperationsMask>( LAYOUT             |
-                                                           ALIGN              |
-                                                           UPDATE_ACTUAL_SIZE |
-                                                           REORDER );
 
   // Queue a cursor reposition event; this must wait until after DoRelayout()
-  if( ( EventData::EDITING == mImpl->mEventData->mState )            ||
-      ( EventData::EDITING_WITH_POPUP == mImpl->mEventData->mState ) ||
-      ( EventData::EDITING_WITH_GRAB_HANDLE == mImpl->mEventData->mState ) )
+  if( EventData::IsEditingState( mImpl->mEventData->mState ) )
   {
     mImpl->mEventData->mUpdateCursorPosition = true;
     mImpl->mEventData->mScrollAfterUpdatePosition = true;
@@ -907,26 +1447,20 @@ void Controller::TextDeletedEvent()
 {
   DALI_ASSERT_DEBUG( NULL != mImpl->mEventData && "Unexpected TextDeletedEvent" );
 
-  // TODO - Optimize this
-  ClearModelData();
+  if( NULL == mImpl->mEventData )
+  {
+    return;
+  }
 
   // The natural size needs to be re-calculated.
   mImpl->mRecalculateNaturalSize = true;
 
   // Apply modifications to the model; TODO - Optimize this
   mImpl->mOperationsPending = ALL_OPERATIONS;
-  mImpl->UpdateModel( ALL_OPERATIONS );
-  mImpl->mOperationsPending = static_cast<OperationsMask>( LAYOUT             |
-                                                           ALIGN              |
-                                                           UPDATE_ACTUAL_SIZE |
-                                                           REORDER );
 
   // Queue a cursor reposition event; this must wait until after DoRelayout()
-  if( 0u == mImpl->mLogicalModel->mText.Count() )
-  {
-    mImpl->mEventData->mUpdateCursorPosition = true;
-  }
-  else
+  mImpl->mEventData->mUpdateCursorPosition = true;
+  if( 0u != mImpl->mLogicalModel->mText.Count() )
   {
     mImpl->mEventData->mScrollAfterDelete = true;
   }
@@ -942,16 +1476,35 @@ bool Controller::DoRelayout( const Size& size,
   // Calculate the operations to be done.
   const OperationsMask operations = static_cast<OperationsMask>( mImpl->mOperationsPending & operationsRequired );
 
-  if( LAYOUT & operations )
+  const CharacterIndex startIndex = mImpl->mTextUpdateInfo.mParagraphCharacterIndex;
+  const Length requestedNumberOfCharacters = mImpl->mTextUpdateInfo.mRequestedNumberOfCharacters;
+
+  if( NO_OPERATION != ( LAYOUT & operations ) )
   {
+    DALI_LOG_INFO( gLogFilter, Debug::Verbose, "-->Controller::DoRelayout LAYOUT & operations\n");
+
     // Some vectors with data needed to layout and reorder may be void
     // after the first time the text has been laid out.
     // Fill the vectors again.
 
-    const Length numberOfGlyphs = mImpl->mVisualModel->mGlyphs.Count();
+    // Calculate the number of glyphs to layout.
+    const Vector<GlyphIndex>& charactersToGlyph = mImpl->mVisualModel->mCharactersToGlyph;
+    const Vector<Length>& glyphsPerCharacter = mImpl->mVisualModel->mGlyphsPerCharacter;
+    const GlyphIndex* const charactersToGlyphBuffer = charactersToGlyph.Begin();
+    const Length* const glyphsPerCharacterBuffer = glyphsPerCharacter.Begin();
 
-    if( 0u == numberOfGlyphs )
+    const CharacterIndex lastIndex = startIndex + ( ( requestedNumberOfCharacters > 0u ) ? requestedNumberOfCharacters - 1u : 0u );
+    const GlyphIndex startGlyphIndex = mImpl->mTextUpdateInfo.mStartGlyphIndex;
+    const Length numberOfGlyphs = ( requestedNumberOfCharacters > 0u ) ? *( charactersToGlyphBuffer + lastIndex ) + *( glyphsPerCharacterBuffer + lastIndex ) - startGlyphIndex : 0u;
+    const Length totalNumberOfGlyphs = mImpl->mVisualModel->mGlyphs.Count();
+
+    if( 0u == totalNumberOfGlyphs )
     {
+      if( NO_OPERATION != ( UPDATE_ACTUAL_SIZE & operations ) )
+      {
+        mImpl->mVisualModel->SetLayoutSize( Size::ZERO );
+      }
+
       // Nothing else to do if there is no glyphs.
       DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--Controller::DoRelayout no glyphs, view updated true\n" );
       return true;
@@ -971,42 +1524,46 @@ bool Controller::DoRelayout( const Size& size,
                                        lineBreakInfo.Begin(),
                                        wordBreakInfo.Begin(),
                                        ( 0u != characterDirection.Count() ) ? characterDirection.Begin() : NULL,
-                                       numberOfGlyphs,
                                        glyphs.Begin(),
                                        glyphsToCharactersMap.Begin(),
-                                       charactersPerGlyph.Begin() );
-
-    // The laid-out lines.
-    // It's not possible to know in how many lines the text is going to be laid-out,
-    // but it can be resized at least with the number of 'paragraphs' to avoid
-    // some re-allocations.
-    Vector<LineRun>& lines = mImpl->mVisualModel->mLines;
-
-    // Delete any previous laid out lines before setting the new ones.
-    lines.Clear();
-
-    // The capacity of the bidirectional paragraph info is the number of paragraphs.
-    lines.Reserve( mImpl->mLogicalModel->mBidirectionalParagraphInfo.Capacity() );
+                                       charactersPerGlyph.Begin(),
+                                       charactersToGlyphBuffer,
+                                       glyphsPerCharacterBuffer,
+                                       totalNumberOfGlyphs );
 
     // Resize the vector of positions to have the same size than the vector of glyphs.
     Vector<Vector2>& glyphPositions = mImpl->mVisualModel->mGlyphPositions;
-    glyphPositions.Resize( numberOfGlyphs );
+    glyphPositions.Resize( totalNumberOfGlyphs );
 
     // Whether the last character is a new paragraph character.
-    layoutParameters.isLastNewParagraph = TextAbstraction::IsNewParagraph( *( textBuffer + ( mImpl->mLogicalModel->mText.Count() - 1u ) ) );
+    mImpl->mTextUpdateInfo.mIsLastCharacterNewParagraph =  TextAbstraction::IsNewParagraph( *( textBuffer + ( mImpl->mLogicalModel->mText.Count() - 1u ) ) );
+    layoutParameters.isLastNewParagraph = mImpl->mTextUpdateInfo.mIsLastCharacterNewParagraph;
+
+    // The initial glyph and the number of glyphs to layout.
+    layoutParameters.startGlyphIndex = startGlyphIndex;
+    layoutParameters.numberOfGlyphs = numberOfGlyphs;
+    layoutParameters.startLineIndex = mImpl->mTextUpdateInfo.mStartLineIndex;
+    layoutParameters.estimatedNumberOfLines = mImpl->mTextUpdateInfo.mEstimatedNumberOfLines;
 
     // Update the visual model.
     viewUpdated = mImpl->mLayoutEngine.LayoutText( layoutParameters,
                                                    glyphPositions,
-                                                   lines,
+                                                   mImpl->mVisualModel->mLines,
                                                    layoutSize );
 
+
     if( viewUpdated )
     {
+      if ( NO_OPERATION != ( UPDATE_DIRECTION & operations ) )
+      {
+        mImpl->mAutoScrollDirectionRTL = false;
+      }
+
       // Reorder the lines
-      if( REORDER & operations )
+      if( NO_OPERATION != ( REORDER & operations ) )
       {
         Vector<BidirectionalParagraphInfoRun>& bidirectionalInfo = mImpl->mLogicalModel->mBidirectionalParagraphInfo;
+        Vector<BidirectionalLineInfoRun>& bidirectionalLineInfo = mImpl->mLogicalModel->mBidirectionalLineInfo;
 
         // Check first if there are paragraphs with bidirectional info.
         if( 0u != bidirectionalInfo.Count() )
@@ -1015,67 +1572,66 @@ bool Controller::DoRelayout( const Size& size,
           const Length numberOfLines = mImpl->mVisualModel->mLines.Count();
 
           // Reorder the lines.
-          Vector<BidirectionalLineInfoRun> lineBidirectionalInfoRuns;
-          lineBidirectionalInfoRuns.Reserve( numberOfLines ); // Reserve because is not known yet how many lines have right to left characters.
+          bidirectionalLineInfo.Reserve( numberOfLines ); // Reserve because is not known yet how many lines have right to left characters.
           ReorderLines( bidirectionalInfo,
-                        lines,
-                        lineBidirectionalInfoRuns );
-
-          // Set the bidirectional info into the model.
-          const Length numberOfBidirectionalInfoRuns = lineBidirectionalInfoRuns.Count();
-          mImpl->mLogicalModel->SetVisualToLogicalMap( lineBidirectionalInfoRuns.Begin(),
-                                                       numberOfBidirectionalInfoRuns );
+                        startIndex,
+                        requestedNumberOfCharacters,
+                        mImpl->mVisualModel->mLines,
+                        bidirectionalLineInfo );
 
           // Set the bidirectional info per line into the layout parameters.
-          layoutParameters.lineBidirectionalInfoRunsBuffer = lineBidirectionalInfoRuns.Begin();
-          layoutParameters.numberOfBidirectionalInfoRuns = numberOfBidirectionalInfoRuns;
-
-          // Get the character to glyph conversion table and set into the layout.
-          layoutParameters.charactersToGlyphsBuffer = mImpl->mVisualModel->mCharactersToGlyph.Begin();
-
-          // Get the glyphs per character table and set into the layout.
-          layoutParameters.glyphsPerCharacterBuffer = mImpl->mVisualModel->mGlyphsPerCharacter.Begin();
+          layoutParameters.lineBidirectionalInfoRunsBuffer = bidirectionalLineInfo.Begin();
+          layoutParameters.numberOfBidirectionalInfoRuns = bidirectionalLineInfo.Count();
 
           // Re-layout the text. Reorder those lines with right to left characters.
           mImpl->mLayoutEngine.ReLayoutRightToLeftLines( layoutParameters,
+                                                         startIndex,
+                                                         requestedNumberOfCharacters,
                                                          glyphPositions );
 
-          // Free the allocated memory used to store the conversion table in the bidirectional line info run.
-          for( Vector<BidirectionalLineInfoRun>::Iterator it = lineBidirectionalInfoRuns.Begin(),
-                 endIt = lineBidirectionalInfoRuns.End();
-               it != endIt;
-               ++it )
+          if ( ( NO_OPERATION != ( UPDATE_DIRECTION & operations ) ) && ( numberOfLines > 0 ) )
           {
-            BidirectionalLineInfoRun& bidiLineInfo = *it;
-
-            free( bidiLineInfo.visualToLogicalMap );
+            const LineRun* const firstline = mImpl->mVisualModel->mLines.Begin();
+            if ( firstline )
+            {
+              mImpl->mAutoScrollDirectionRTL = firstline->direction;
+            }
           }
         }
       } // REORDER
 
       // Sets the actual size.
-      if( UPDATE_ACTUAL_SIZE & operations )
+      if( NO_OPERATION != ( UPDATE_ACTUAL_SIZE & operations ) )
       {
-        mImpl->mVisualModel->SetActualSize( layoutSize );
+        mImpl->mVisualModel->SetLayoutSize( layoutSize );
       }
     } // view updated
+
+    // Store the size used to layout the text.
+    mImpl->mVisualModel->mControlSize = size;
   }
   else
   {
-    layoutSize = mImpl->mVisualModel->GetActualSize();
+    layoutSize = mImpl->mVisualModel->GetLayoutSize();
   }
 
-  if( ALIGN & operations )
+  if( NO_OPERATION != ( ALIGN & operations ) )
   {
     // The laid-out lines.
     Vector<LineRun>& lines = mImpl->mVisualModel->mLines;
 
-    mImpl->mLayoutEngine.Align( layoutSize,
+    mImpl->mLayoutEngine.Align( size,
+                                startIndex,
+                                requestedNumberOfCharacters,
                                 lines );
 
     viewUpdated = true;
   }
-
+#if defined(DEBUG_ENABLED)
+  std::string currentText;
+  GetText( currentText );
+  DALI_LOG_INFO( gLogFilter, Debug::Concise, "Controller::DoRelayout [%p] mImpl->mAutoScrollDirectionRTL[%s] [%s]\n", this, (mImpl->mAutoScrollDirectionRTL)?"true":"false",  currentText.c_str() );
+#endif
   DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--Controller::DoRelayout, view updated %s\n", ( viewUpdated ? "true" : "false" ) );
   return viewUpdated;
 }
@@ -1143,50 +1699,62 @@ LayoutEngine::VerticalAlignment Controller::GetVerticalAlignment() const
   return mImpl->mLayoutEngine.GetVerticalAlignment();
 }
 
-void Controller::CalculateTextAlignment( const Size& size )
+void Controller::CalculateTextAlignment( const Size& controlSize )
 {
-  // Get the direction of the first character.
-  const CharacterDirection firstParagraphDirection = mImpl->mLogicalModel->GetCharacterDirection( 0u );
+  Size layoutSize = mImpl->mVisualModel->GetLayoutSize();
 
-  Size actualSize = mImpl->mVisualModel->GetActualSize();
-  if( fabsf( actualSize.height ) < Math::MACHINE_EPSILON_1000 )
+  if( fabsf( layoutSize.height ) < Math::MACHINE_EPSILON_1000 )
   {
     // Get the line height of the default font.
-    actualSize.height = mImpl->GetDefaultFontLineHeight();
+    layoutSize.height = mImpl->GetDefaultFontLineHeight();
   }
 
-  // If the first paragraph is right to left swap ALIGN_BEGIN and ALIGN_END;
-  LayoutEngine::HorizontalAlignment horizontalAlignment = mImpl->mLayoutEngine.GetHorizontalAlignment();
-  if( firstParagraphDirection &&
-      ( LayoutEngine::HORIZONTAL_ALIGN_CENTER != horizontalAlignment ) )
+  if( LayoutEngine::SINGLE_LINE_BOX == mImpl->mLayoutEngine.GetLayout() )
   {
-    if( LayoutEngine::HORIZONTAL_ALIGN_BEGIN == horizontalAlignment )
-    {
-      horizontalAlignment = LayoutEngine::HORIZONTAL_ALIGN_END;
-    }
-    else
-    {
-      horizontalAlignment = LayoutEngine::HORIZONTAL_ALIGN_BEGIN;
-    }
-  }
+    // Get the direction of the first character.
+    const CharacterDirection firstParagraphDirection = mImpl->mLogicalModel->GetCharacterDirection( 0u );
 
-  switch( horizontalAlignment )
-  {
-    case LayoutEngine::HORIZONTAL_ALIGN_BEGIN:
-    {
-      mImpl->mAlignmentOffset.x = 0.f;
-      break;
-    }
-    case LayoutEngine::HORIZONTAL_ALIGN_CENTER:
+    // If the first paragraph is right to left swap ALIGN_BEGIN and ALIGN_END;
+    LayoutEngine::HorizontalAlignment horizontalAlignment = mImpl->mLayoutEngine.GetHorizontalAlignment();
+    if( firstParagraphDirection )
     {
-      const int intOffset = static_cast<int>( 0.5f * ( size.width - actualSize.width ) ); // try to avoid pixel alignment.
-      mImpl->mAlignmentOffset.x = static_cast<float>( intOffset );
-      break;
+      switch( horizontalAlignment )
+      {
+        case LayoutEngine::HORIZONTAL_ALIGN_BEGIN:
+        {
+          horizontalAlignment = LayoutEngine::HORIZONTAL_ALIGN_END;
+          break;
+        }
+        case LayoutEngine::HORIZONTAL_ALIGN_CENTER:
+        {
+          // Nothing to do.
+          break;
+        }
+        case LayoutEngine::HORIZONTAL_ALIGN_END:
+        {
+          horizontalAlignment = LayoutEngine::HORIZONTAL_ALIGN_BEGIN;
+          break;
+        }
+      }
     }
-    case LayoutEngine::HORIZONTAL_ALIGN_END:
+
+    switch( horizontalAlignment )
     {
-      mImpl->mAlignmentOffset.x = size.width - actualSize.width;
-      break;
+      case LayoutEngine::HORIZONTAL_ALIGN_BEGIN:
+      {
+        mImpl->mAlignmentOffset.x = 0.f;
+        break;
+      }
+      case LayoutEngine::HORIZONTAL_ALIGN_CENTER:
+      {
+        mImpl->mAlignmentOffset.x = floorf( 0.5f * ( controlSize.width - layoutSize.width ) ); // try to avoid pixel alignment.
+        break;
+      }
+      case LayoutEngine::HORIZONTAL_ALIGN_END:
+      {
+        mImpl->mAlignmentOffset.x = controlSize.width - layoutSize.width;
+        break;
+      }
     }
   }
 
@@ -1200,13 +1768,12 @@ void Controller::CalculateTextAlignment( const Size& size )
     }
     case LayoutEngine::VERTICAL_ALIGN_CENTER:
     {
-      const int intOffset = static_cast<int>( 0.5f * ( size.height - actualSize.height ) ); // try to avoid pixel alignment.
-      mImpl->mAlignmentOffset.y = static_cast<float>( intOffset );
+      mImpl->mAlignmentOffset.y = floorf( 0.5f * ( controlSize.height - layoutSize.height ) ); // try to avoid pixel alignment.
       break;
     }
     case LayoutEngine::VERTICAL_ALIGN_BOTTOM:
     {
-      mImpl->mAlignmentOffset.y = size.height - actualSize.height;
+      mImpl->mAlignmentOffset.y = controlSize.height - layoutSize.height;
       break;
     }
   }
@@ -1226,7 +1793,7 @@ void Controller::KeyboardFocusGainEvent()
 {
   DALI_ASSERT_DEBUG( mImpl->mEventData && "Unexpected KeyboardFocusGainEvent" );
 
-  if( mImpl->mEventData )
+  if( NULL != mImpl->mEventData )
   {
     if( ( EventData::INACTIVE == mImpl->mEventData->mState ) ||
         ( EventData::INTERRUPTED == mImpl->mEventData->mState ) )
@@ -1249,9 +1816,9 @@ void Controller::KeyboardFocusLostEvent()
 {
   DALI_ASSERT_DEBUG( mImpl->mEventData && "Unexpected KeyboardFocusLostEvent" );
 
-  if( mImpl->mEventData )
+  if( NULL != mImpl->mEventData )
   {
-    if ( EventData::INTERRUPTED != mImpl->mEventData->mState )
+    if( EventData::INTERRUPTED != mImpl->mEventData->mState )
     {
       mImpl->ChangeState( EventData::INACTIVE );
 
@@ -1271,8 +1838,8 @@ bool Controller::KeyEvent( const Dali::KeyEvent& keyEvent )
 
   bool textChanged( false );
 
-  if( mImpl->mEventData &&
-      keyEvent.state == KeyEvent::Down )
+  if( ( NULL != mImpl->mEventData ) &&
+      ( keyEvent.state == KeyEvent::Down ) )
   {
     int keyCode = keyEvent.keyCode;
     const std::string& keyString = keyEvent.keyPressed;
@@ -1283,10 +1850,10 @@ bool Controller::KeyEvent( const Dali::KeyEvent& keyEvent )
       // Escape key is a special case which causes focus loss
       KeyboardFocusLostEvent();
     }
-    else if( Dali::DALI_KEY_CURSOR_LEFT  == keyCode ||
-             Dali::DALI_KEY_CURSOR_RIGHT == keyCode ||
-             Dali::DALI_KEY_CURSOR_UP    == keyCode ||
-             Dali::DALI_KEY_CURSOR_DOWN  == keyCode )
+    else if( ( Dali::DALI_KEY_CURSOR_LEFT  == keyCode ) ||
+             ( Dali::DALI_KEY_CURSOR_RIGHT == keyCode ) ||
+             ( Dali::DALI_KEY_CURSOR_UP    == keyCode ) ||
+             ( Dali::DALI_KEY_CURSOR_DOWN  == keyCode ) )
     {
       Event event( Event::CURSOR_KEY_EVENT );
       event.p1.mInt = keyCode;
@@ -1296,13 +1863,13 @@ bool Controller::KeyEvent( const Dali::KeyEvent& keyEvent )
     {
       textChanged = BackspaceKeyEvent();
     }
-    else if ( IsKey( keyEvent,  Dali::DALI_KEY_POWER ) )
+    else if( IsKey( keyEvent,  Dali::DALI_KEY_POWER ) )
     {
       mImpl->ChangeState( EventData::INTERRUPTED ); // State is not INACTIVE as expect to return to edit mode.
       // Avoids calling the InsertText() method which can delete selected text
     }
-    else if ( IsKey( keyEvent, Dali::DALI_KEY_MENU ) ||
-              IsKey( keyEvent, Dali::DALI_KEY_HOME ) )
+    else if( IsKey( keyEvent, Dali::DALI_KEY_MENU ) ||
+             IsKey( keyEvent, Dali::DALI_KEY_HOME ) )
     {
       mImpl->ChangeState( EventData::INACTIVE );
       // Menu/Home key behaviour does not allow edit mode to resume like Power key
@@ -1326,8 +1893,8 @@ bool Controller::KeyEvent( const Dali::KeyEvent& keyEvent )
       textChanged = true;
     }
 
-    if ( ( mImpl->mEventData->mState != EventData::INTERRUPTED ) &&
-         ( mImpl->mEventData->mState != EventData::INACTIVE ) )
+    if( ( mImpl->mEventData->mState != EventData::INTERRUPTED ) &&
+        ( mImpl->mEventData->mState != EventData::INACTIVE ) )
     {
       mImpl->ChangeState( EventData::EDITING );
     }
@@ -1341,7 +1908,7 @@ bool Controller::KeyEvent( const Dali::KeyEvent& keyEvent )
     mImpl->mControlInterface.TextChanged();
   }
 
-  return false;
+  return true;
 }
 
 void Controller::InsertText( const std::string& text, Controller::InsertType type )
@@ -1350,6 +1917,12 @@ void Controller::InsertText( const std::string& text, Controller::InsertType typ
   bool maxLengthReached( false );
 
   DALI_ASSERT_DEBUG( NULL != mImpl->mEventData && "Unexpected InsertText" )
+
+  if( NULL == mImpl->mEventData )
+  {
+    return;
+  }
+
   DALI_LOG_INFO( gLogFilter, Debug::Verbose, "Controller::InsertText %p %s (%s) mPrimaryCursorPosition %d mPreEditFlag %d mPreEditStartPosition %d mPreEditLength %d\n",
                  this, text.c_str(), (COMMIT == type ? "COMMIT" : "PRE_EDIT"),
                  mImpl->mEventData->mPrimaryCursorPosition, mImpl->mEventData->mPreEditFlag, mImpl->mEventData->mPreEditStartPosition, mImpl->mEventData->mPreEditLength );
@@ -1361,16 +1934,17 @@ void Controller::InsertText( const std::string& text, Controller::InsertType typ
   Length characterCount( 0u );
 
   // Remove the previous IMF pre-edit (predicitive text)
-  if( mImpl->mEventData &&
-      mImpl->mEventData->mPreEditFlag &&
-      0 != mImpl->mEventData->mPreEditLength )
+  if( mImpl->mEventData->mPreEditFlag &&
+      ( 0u != mImpl->mEventData->mPreEditLength ) )
   {
-    CharacterIndex offset = mImpl->mEventData->mPrimaryCursorPosition - mImpl->mEventData->mPreEditStartPosition;
+    const CharacterIndex offset = mImpl->mEventData->mPrimaryCursorPosition - mImpl->mEventData->mPreEditStartPosition;
 
-    removedPrevious = RemoveText( -static_cast<int>(offset), mImpl->mEventData->mPreEditLength );
+    removedPrevious = RemoveText( -static_cast<int>( offset ),
+                                  mImpl->mEventData->mPreEditLength,
+                                  DONT_UPDATE_INPUT_STYLE );
 
     mImpl->mEventData->mPrimaryCursorPosition = mImpl->mEventData->mPreEditStartPosition;
-    mImpl->mEventData->mPreEditLength = 0;
+    mImpl->mEventData->mPreEditLength = 0u;
   }
   else
   {
@@ -1406,39 +1980,121 @@ void Controller::InsertText( const std::string& text, Controller::InsertType typ
     mImpl->ChangeState( EventData::EDITING );
 
     // Handle the IMF (predicitive text) state changes
-    if( mImpl->mEventData )
+    if( COMMIT == type )
     {
-      if( COMMIT == type )
-      {
-        // IMF manager is no longer handling key-events
-        mImpl->ClearPreEditFlag();
-      }
-      else // PRE_EDIT
+      // IMF manager is no longer handling key-events
+      mImpl->ClearPreEditFlag();
+    }
+    else // PRE_EDIT
+    {
+      if( !mImpl->mEventData->mPreEditFlag )
       {
-        if( !mImpl->mEventData->mPreEditFlag )
-        {
-          DALI_LOG_INFO( gLogFilter, Debug::Verbose, "Entered PreEdit state" );
+        DALI_LOG_INFO( gLogFilter, Debug::Verbose, "Entered PreEdit state" );
 
-          // Record the start of the pre-edit text
-          mImpl->mEventData->mPreEditStartPosition = mImpl->mEventData->mPrimaryCursorPosition;
-        }
+        // Record the start of the pre-edit text
+        mImpl->mEventData->mPreEditStartPosition = mImpl->mEventData->mPrimaryCursorPosition;
+      }
 
-        mImpl->mEventData->mPreEditLength = utf32Characters.Count();
-        mImpl->mEventData->mPreEditFlag = true;
+      mImpl->mEventData->mPreEditLength = utf32Characters.Count();
+      mImpl->mEventData->mPreEditFlag = true;
 
-        DALI_LOG_INFO( gLogFilter, Debug::Verbose, "mPreEditStartPosition %d mPreEditLength %d\n", mImpl->mEventData->mPreEditStartPosition, mImpl->mEventData->mPreEditLength );
-      }
+      DALI_LOG_INFO( gLogFilter, Debug::Verbose, "mPreEditStartPosition %d mPreEditLength %d\n", mImpl->mEventData->mPreEditStartPosition, mImpl->mEventData->mPreEditLength );
     }
 
     const Length numberOfCharactersInModel = mImpl->mLogicalModel->mText.Count();
 
-    // Restrict new text to fit within Maximum characters setting
-    Length maxSizeOfNewText = std::min ( ( mImpl->mMaximumNumberOfCharacters - numberOfCharactersInModel ), characterCount );
+    // Restrict new text to fit within Maximum characters setting.
+    Length maxSizeOfNewText = std::min( ( mImpl->mMaximumNumberOfCharacters - numberOfCharactersInModel ), characterCount );
     maxLengthReached = ( characterCount > maxSizeOfNewText );
 
-    // Insert at current cursor position
+    // The cursor position.
     CharacterIndex& cursorIndex = mImpl->mEventData->mPrimaryCursorPosition;
 
+    // Update the text's style.
+
+    // Updates the text style runs by adding characters.
+    mImpl->mLogicalModel->UpdateTextStyleRuns( cursorIndex, maxSizeOfNewText );
+
+    // Get the character index from the cursor index.
+    const CharacterIndex styleIndex = ( cursorIndex > 0u ) ? cursorIndex - 1u : 0u;
+
+    // Retrieve the text's style for the given index.
+    InputStyle style;
+    mImpl->RetrieveDefaultInputStyle( style );
+    mImpl->mLogicalModel->RetrieveStyle( styleIndex, style );
+
+    // Whether to add a new text color run.
+    const bool addColorRun = ( style.textColor != mImpl->mEventData->mInputStyle.textColor );
+
+    // Whether to add a new font run.
+    const bool addFontNameRun = style.familyName != mImpl->mEventData->mInputStyle.familyName;
+    const bool addFontWeightRun = style.weight != mImpl->mEventData->mInputStyle.weight;
+    const bool addFontWidthRun = style.width != mImpl->mEventData->mInputStyle.width;
+    const bool addFontSlantRun = style.slant != mImpl->mEventData->mInputStyle.slant;
+    const bool addFontSizeRun = style.size != mImpl->mEventData->mInputStyle.size;
+
+    // Add style runs.
+    if( addColorRun )
+    {
+      const VectorBase::SizeType numberOfRuns = mImpl->mLogicalModel->mColorRuns.Count();
+      mImpl->mLogicalModel->mColorRuns.Resize( numberOfRuns + 1u );
+
+      ColorRun& colorRun = *( mImpl->mLogicalModel->mColorRuns.Begin() + numberOfRuns );
+      colorRun.color = mImpl->mEventData->mInputStyle.textColor;
+      colorRun.characterRun.characterIndex = cursorIndex;
+      colorRun.characterRun.numberOfCharacters = maxSizeOfNewText;
+    }
+
+    if( addFontNameRun   ||
+        addFontWeightRun ||
+        addFontWidthRun  ||
+        addFontSlantRun  ||
+        addFontSizeRun )
+    {
+      const VectorBase::SizeType numberOfRuns = mImpl->mLogicalModel->mFontDescriptionRuns.Count();
+      mImpl->mLogicalModel->mFontDescriptionRuns.Resize( numberOfRuns + 1u );
+
+      FontDescriptionRun& fontDescriptionRun = *( mImpl->mLogicalModel->mFontDescriptionRuns.Begin() + numberOfRuns );
+
+      if( addFontNameRun )
+      {
+        fontDescriptionRun.familyLength = mImpl->mEventData->mInputStyle.familyName.size();
+        fontDescriptionRun.familyName = new char[fontDescriptionRun.familyLength];
+        memcpy( fontDescriptionRun.familyName, mImpl->mEventData->mInputStyle.familyName.c_str(), fontDescriptionRun.familyLength );
+        fontDescriptionRun.familyDefined = true;
+
+        // The memory allocated for the font family name is freed when the font description is removed from the logical model.
+      }
+
+      if( addFontWeightRun )
+      {
+        fontDescriptionRun.weight = mImpl->mEventData->mInputStyle.weight;
+        fontDescriptionRun.weightDefined = true;
+      }
+
+      if( addFontWidthRun )
+      {
+        fontDescriptionRun.width = mImpl->mEventData->mInputStyle.width;
+        fontDescriptionRun.widthDefined = true;
+      }
+
+      if( addFontSlantRun )
+      {
+        fontDescriptionRun.slant = mImpl->mEventData->mInputStyle.slant;
+        fontDescriptionRun.slantDefined = true;
+      }
+
+      if( addFontSizeRun )
+      {
+        fontDescriptionRun.size = static_cast<PointSize26Dot6>( mImpl->mEventData->mInputStyle.size * 64.f );
+        fontDescriptionRun.sizeDefined = true;
+      }
+
+      fontDescriptionRun.characterRun.characterIndex = cursorIndex;
+      fontDescriptionRun.characterRun.numberOfCharacters = maxSizeOfNewText;
+    }
+
+    // Insert at current cursor position.
     Vector<Character>& modifyText = mImpl->mLogicalModel->mText;
 
     if( cursorIndex < numberOfCharactersInModel )
@@ -1450,12 +2106,17 @@ void Controller::InsertText( const std::string& text, Controller::InsertType typ
       modifyText.Insert( modifyText.End(), utf32Characters.Begin(), utf32Characters.Begin() + maxSizeOfNewText );
     }
 
+    // Mark the first paragraph to be updated.
+    mImpl->mTextUpdateInfo.mCharacterIndex = std::min( cursorIndex, mImpl->mTextUpdateInfo.mCharacterIndex );
+    mImpl->mTextUpdateInfo.mNumberOfCharactersToAdd += maxSizeOfNewText;
+
+    // Update the cursor index.
     cursorIndex += maxSizeOfNewText;
 
     DALI_LOG_INFO( gLogFilter, Debug::Verbose, "Inserted %d characters, new size %d new cursor %d\n", maxSizeOfNewText, mImpl->mLogicalModel->mText.Count(), mImpl->mEventData->mPrimaryCursorPosition );
   }
 
-  if( 0u == mImpl->mLogicalModel->mText.Count() &&
+  if( ( 0u == mImpl->mLogicalModel->mText.Count() ) &&
       mImpl->IsPlaceholderAvailable() )
   {
     // Show place-holder if empty after removing the pre-edit text
@@ -1464,7 +2125,7 @@ void Controller::InsertText( const std::string& text, Controller::InsertType typ
     mImpl->ClearPreEditFlag();
   }
   else if( removedPrevious ||
-           0 != utf32Characters.Count() )
+           ( 0 != utf32Characters.Count() ) )
   {
     // Queue an inserted event
     mImpl->QueueModifyEvent( ModifyEvent::TEXT_INSERTED );
@@ -1485,8 +2146,7 @@ bool Controller::RemoveSelectedText()
 {
   bool textRemoved( false );
 
-  if ( EventData::SELECTING         == mImpl->mEventData->mState ||
-       EventData::SELECTION_CHANGED == mImpl->mEventData->mState )
+  if( EventData::SELECTING == mImpl->mEventData->mState )
   {
     std::string removedString;
     mImpl->RetrieveSelection( removedString, true );
@@ -1507,33 +2167,49 @@ void Controller::TapEvent( unsigned int tapCount, float x, float y )
 
   if( NULL != mImpl->mEventData )
   {
+    DALI_LOG_INFO( gLogFilter, Debug::Concise, "TapEvent state:%d \n", mImpl->mEventData->mState );
+
     if( 1u == tapCount )
     {
       // This is to avoid unnecessary relayouts when tapping an empty text-field
       bool relayoutNeeded( false );
 
-      if( mImpl->IsShowingRealText() &&
-          EventData::EDITING == mImpl->mEventData->mState )
+      if( ( EventData::EDITING_WITH_POPUP == mImpl->mEventData->mState ) ||
+          ( EventData::EDITING_WITH_PASTE_POPUP == mImpl->mEventData->mState ) )
       {
-        // Show grab handle on second tap
-        mImpl->ChangeState( EventData::EDITING_WITH_GRAB_HANDLE );
-        relayoutNeeded = true;
+        mImpl->ChangeState( EventData::EDITING_WITH_GRAB_HANDLE );  // If Popup shown hide it here so can be shown again if required.
       }
-      else if( EventData::EDITING                  != mImpl->mEventData->mState &&
-               EventData::EDITING_WITH_GRAB_HANDLE != mImpl->mEventData->mState )
+
+      if( mImpl->IsShowingRealText() && ( EventData::INACTIVE != mImpl->mEventData->mState ) )
       {
-        if( mImpl->IsShowingPlaceholderText() &&  ! mImpl->IsFocusedPlaceholderAvailable() )
+        // Already in an active state so show a popup
+        if( !mImpl->IsClipboardEmpty() )
         {
-          // Hide placeholder text
-          ResetText();
+          // Shows Paste popup but could show full popup with Selection options. ( EDITING_WITH_POPUP )
+          mImpl->ChangeState( EventData::EDITING_WITH_PASTE_POPUP );
+        }
+        else
+        {
+          mImpl->ChangeState( EventData::EDITING_WITH_GRAB_HANDLE );
         }
-        // Show cursor on first tap
-        mImpl->ChangeState( EventData::EDITING );
         relayoutNeeded = true;
       }
-      else if( mImpl->IsShowingRealText() )
+      else
       {
-        // Move the cursor
+        if( mImpl->IsShowingPlaceholderText() && !mImpl->IsFocusedPlaceholderAvailable() )
+        {
+          // Hide placeholder text
+          ResetText();
+        }
+
+        if( EventData::INACTIVE == mImpl->mEventData->mState )
+        {
+          mImpl->ChangeState( EventData::EDITING );
+        }
+        else if( !mImpl->IsClipboardEmpty() )
+        {
+          mImpl->ChangeState( EventData::EDITING_WITH_POPUP );
+        }
         relayoutNeeded = true;
       }
 
@@ -1564,10 +2240,11 @@ void Controller::TapEvent( unsigned int tapCount, float x, float y )
 }
 
 void Controller::PanEvent( Gesture::State state, const Vector2& displacement )
+        // Show cursor and grabhandle on first tap, this matches the behaviour of tapping when already editing
 {
   DALI_ASSERT_DEBUG( mImpl->mEventData && "Unexpected PanEvent" );
 
-  if( mImpl->mEventData )
+  if( NULL != mImpl->mEventData )
   {
     Event event( Event::PAN_EVENT );
     event.p1.mInt = state;
@@ -1583,10 +2260,10 @@ void Controller::LongPressEvent( Gesture::State state, float x, float y  )
 {
   DALI_ASSERT_DEBUG( mImpl->mEventData && "Unexpected LongPressEvent" );
 
-  if( state == Gesture::Started &&
-      mImpl->mEventData )
+  if( ( state == Gesture::Started ) &&
+      ( NULL != mImpl->mEventData ) )
   {
-    if( ! mImpl->IsShowingRealText() )
+    if( !mImpl->IsShowingRealText() )
     {
       Event event( Event::LONG_PRESS_EVENT );
       event.p1.mInt = state;
@@ -1621,16 +2298,11 @@ void Controller::LongPressEvent( Gesture::State state, float x, float y  )
 
 void Controller::SelectEvent( float x, float y, bool selectAll )
 {
-  if( mImpl->mEventData )
+  DALI_LOG_INFO( gLogFilter, Debug::Verbose, "Controller::SelectEvent\n" );
+
+  if( NULL != mImpl->mEventData )
   {
-    if ( mImpl->mEventData->mState == EventData::SELECTING )
-    {
-      mImpl->ChangeState( EventData::SELECTION_CHANGED );
-    }
-    else
-    {
-      mImpl->ChangeState( EventData::SELECTING );
-    }
+    mImpl->ChangeState( EventData::SELECTING );
 
     if( selectAll )
     {
@@ -1663,7 +2335,7 @@ void Controller::DecorationEvent( HandleType handleType, HandleState state, floa
 {
   DALI_ASSERT_DEBUG( mImpl->mEventData && "Unexpected DecorationEvent" );
 
-  if( mImpl->mEventData )
+  if( NULL != mImpl->mEventData )
   {
     switch( handleType )
     {
@@ -1718,13 +2390,27 @@ void Controller::PasteText( const std::string& stringToPaste )
   InsertText( stringToPaste, Text::Controller::COMMIT );
   mImpl->ChangeState( EventData::EDITING );
   mImpl->RequestRelayout();
+
+  // Do this last since it provides callbacks into application code
+  mImpl->mControlInterface.TextChanged();
 }
 
 void Controller::PasteClipboardItemEvent()
 {
+  // Retrieve the clipboard contents first
   ClipboardEventNotifier notifier( ClipboardEventNotifier::Get() );
   std::string stringToPaste( notifier.GetContent() );
+
+  // Commit the current pre-edit text; the contents of the clipboard should be appended
+  mImpl->ResetImfManager();
+
+  // Temporary disable hiding clipboard
+  mImpl->SetClipboardHideEnable( false );
+
+  // Paste
   PasteText( stringToPaste );
+
+  mImpl->SetClipboardHideEnable( true );
 }
 
 void Controller::TextPopupButtonTouched( Dali::Toolkit::TextSelectionPopup::Buttons button )
@@ -1747,7 +2433,7 @@ void Controller::TextPopupButtonTouched( Dali::Toolkit::TextSelectionPopup::Butt
         NotifyImfManager();
       }
 
-      if( 0u != mImpl->mLogicalModel->mText.Count() ||
+      if( ( 0u != mImpl->mLogicalModel->mText.Count() ) ||
           !mImpl->IsPlaceholderAvailable() )
       {
         mImpl->QueueModifyEvent( ModifyEvent::TEXT_DELETED );
@@ -1778,7 +2464,7 @@ void Controller::TextPopupButtonTouched( Dali::Toolkit::TextSelectionPopup::Butt
     {
       const Vector2& currentCursorPosition = mImpl->mEventData->mDecorator->GetPosition( PRIMARY_CURSOR );
 
-      if( mImpl->mEventData->mSelectionEnabled  )
+      if( mImpl->mEventData->mSelectionEnabled )
       {
         // Creates a SELECT event.
         SelectEvent( currentCursorPosition.x, currentCursorPosition.y, false );
@@ -1806,18 +2492,18 @@ void Controller::TextPopupButtonTouched( Dali::Toolkit::TextSelectionPopup::Butt
 
 ImfManager::ImfCallbackData Controller::OnImfEvent( ImfManager& imfManager, const ImfManager::ImfEventData& imfEvent )
 {
-  bool update( false );
+  bool update = false;
   bool requestRelayout = false;
 
   std::string text;
-  unsigned int cursorPosition( 0 );
+  unsigned int cursorPosition = 0u;
 
-  switch ( imfEvent.eventName )
+  switch( imfEvent.eventName )
   {
     case ImfManager::COMMIT:
     {
       InsertText( imfEvent.predictiveString, Text::Controller::COMMIT );
-      update=true;
+      update = true;
       requestRelayout = true;
       break;
     }
@@ -1830,11 +2516,13 @@ ImfManager::ImfCallbackData Controller::OnImfEvent( ImfManager& imfManager, cons
     }
     case ImfManager::DELETESURROUNDING:
     {
-      update = RemoveText( imfEvent.cursorOffset, imfEvent.numberOfChars );
+      update = RemoveText( imfEvent.cursorOffset,
+                           imfEvent.numberOfChars,
+                           DONT_UPDATE_INPUT_STYLE );
 
       if( update )
       {
-        if( 0u != mImpl->mLogicalModel->mText.Count() ||
+        if( ( 0u != mImpl->mLogicalModel->mText.Count() ) ||
             !mImpl->IsPlaceholderAvailable() )
         {
           mImpl->QueueModifyEvent( ModifyEvent::TEXT_DELETED );
@@ -1893,20 +2581,26 @@ bool Controller::BackspaceKeyEvent()
 {
   DALI_LOG_INFO( gLogFilter, Debug::Verbose, "Controller::KeyEvent %p DALI_KEY_BACKSPACE\n", this );
 
+  bool removed = false;
+
+  if( NULL == mImpl->mEventData )
+  {
+    return removed;
+  }
+
   // IMF manager is no longer handling key-events
   mImpl->ClearPreEditFlag();
 
-  bool removed( false );
-
-  if ( EventData::SELECTING         == mImpl->mEventData->mState ||
-       EventData::SELECTION_CHANGED == mImpl->mEventData->mState )
+  if( EventData::SELECTING == mImpl->mEventData->mState )
   {
     removed = RemoveSelectedText();
   }
   else if( mImpl->mEventData->mPrimaryCursorPosition > 0 )
   {
     // Remove the character before the current cursor position
-    removed = RemoveText( -1, 1 );
+    removed = RemoveText( -1,
+                          1,
+                          UPDATE_INPUT_STYLE );
   }
 
   if( removed )
@@ -1916,7 +2610,7 @@ bool Controller::BackspaceKeyEvent()
     // Automatic  Upper-case and restarting prediction on an existing word require this.
     NotifyImfManager();
 
-    if( 0u != mImpl->mLogicalModel->mText.Count() ||
+    if( ( 0u != mImpl->mLogicalModel->mText.Count() ) ||
         !mImpl->IsPlaceholderAvailable() )
     {
       mImpl->QueueModifyEvent( ModifyEvent::TEXT_DELETED );
@@ -1933,19 +2627,17 @@ bool Controller::BackspaceKeyEvent()
 
 void Controller::NotifyImfManager()
 {
-  if( mImpl->mEventData )
+  if( NULL != mImpl->mEventData )
   {
-    ImfManager imfManager = ImfManager::Get();
-
-    if( imfManager )
+    if( mImpl->mEventData->mImfManager )
     {
       // Notifying IMF of a cursor change triggers a surrounding text request so updating it now.
       std::string text;
       GetText( text );
-      imfManager.SetSurroundingText( text );
+      mImpl->mEventData->mImfManager.SetSurroundingText( text );
 
-      imfManager.SetCursorPosition( GetLogicalCursorPosition() );
-      imfManager.NotifyCursorPosition();
+      mImpl->mEventData->mImfManager.SetCursorPosition( GetLogicalCursorPosition() );
+      mImpl->mEventData->mImfManager.NotifyCursorPosition();
     }
   }
 }
@@ -1956,6 +2648,11 @@ void Controller::ShowPlaceholderText()
   {
     DALI_ASSERT_DEBUG( mImpl->mEventData && "No placeholder text available" );
 
+    if( NULL == mImpl->mEventData )
+    {
+      return;
+    }
+
     mImpl->mEventData->mIsShowingPlaceholderText = true;
 
     // Disable handles when showing place-holder text
@@ -1967,8 +2664,8 @@ void Controller::ShowPlaceholderText()
     size_t size( 0 );
 
     // TODO - Switch placeholder text styles when changing state
-    if( EventData::INACTIVE != mImpl->mEventData->mState &&
-        0u != mImpl->mEventData->mPlaceholderTextActive.c_str() )
+    if( ( EventData::INACTIVE != mImpl->mEventData->mState ) &&
+        ( 0u != mImpl->mEventData->mPlaceholderTextActive.c_str() ) )
     {
       text = mImpl->mEventData->mPlaceholderTextActive.c_str();
       size = mImpl->mEventData->mPlaceholderTextActive.size();
@@ -1979,9 +2676,11 @@ void Controller::ShowPlaceholderText()
       size = mImpl->mEventData->mPlaceholderTextInactive.size();
     }
 
+    mImpl->mTextUpdateInfo.mCharacterIndex = 0u;
+    mImpl->mTextUpdateInfo.mNumberOfCharactersToRemove = mImpl->mTextUpdateInfo.mPreviousNumberOfCharacters;
+
     // Reset model for showing placeholder.
     mImpl->mLogicalModel->mText.Clear();
-    ClearModelData();
     mImpl->mVisualModel->SetTextColor( mImpl->mEventData->mPlaceholderTextColor );
 
     // Convert text into UTF-32
@@ -1993,9 +2692,12 @@ void Controller::ShowPlaceholderText()
 
     // Transform a text array encoded in utf8 into an array encoded in utf32.
     // It returns the actual number of characters.
-    Length characterCount = Utf8ToUtf32( utf8, size, utf32Characters.Begin() );
+    const Length characterCount = Utf8ToUtf32( utf8, size, utf32Characters.Begin() );
     utf32Characters.Resize( characterCount );
 
+    // The characters to be added.
+    mImpl->mTextUpdateInfo.mNumberOfCharactersToAdd = characterCount;
+
     // Reset the cursor position
     mImpl->mEventData->mPrimaryCursorPosition = 0;
 
@@ -2010,40 +2712,36 @@ void Controller::ShowPlaceholderText()
   }
 }
 
-void Controller::ClearModelData()
+void Controller::ClearFontData()
 {
-  // n.b. This does not Clear the mText from mLogicalModel
-  mImpl->mLogicalModel->mScriptRuns.Clear();
-  mImpl->mLogicalModel->mFontRuns.Clear();
-  mImpl->mLogicalModel->mLineBreakInfo.Clear();
-  mImpl->mLogicalModel->mWordBreakInfo.Clear();
-  mImpl->mLogicalModel->mBidirectionalParagraphInfo.Clear();
-  mImpl->mLogicalModel->mCharacterDirections.Clear();
-  mImpl->mLogicalModel->mBidirectionalLineInfo.Clear();
-  mImpl->mLogicalModel->mLogicalToVisualMap.Clear();
-  mImpl->mLogicalModel->mVisualToLogicalMap.Clear();
-  mImpl->mVisualModel->mGlyphs.Clear();
-  mImpl->mVisualModel->mGlyphsToCharacters.Clear();
-  mImpl->mVisualModel->mCharactersToGlyph.Clear();
-  mImpl->mVisualModel->mCharactersPerGlyph.Clear();
-  mImpl->mVisualModel->mGlyphsPerCharacter.Clear();
-  mImpl->mVisualModel->mGlyphPositions.Clear();
-  mImpl->mVisualModel->mLines.Clear();
-  mImpl->mVisualModel->ClearCaches();
+  if( mImpl->mFontDefaults )
+  {
+    mImpl->mFontDefaults->mFontId = 0u; // Remove old font ID
+  }
+
+  // Set flags to update the model.
+  mImpl->mTextUpdateInfo.mCharacterIndex = 0u;
+  mImpl->mTextUpdateInfo.mNumberOfCharactersToRemove = mImpl->mTextUpdateInfo.mPreviousNumberOfCharacters;
+  mImpl->mTextUpdateInfo.mNumberOfCharactersToAdd = mImpl->mLogicalModel->mText.Count();
+
+  mImpl->mTextUpdateInfo.mClearAll = true;
+  mImpl->mTextUpdateInfo.mFullRelayoutNeeded = true;
+  mImpl->mRecalculateNaturalSize = true;
+
+  mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending |
+                                                           VALIDATE_FONTS            |
+                                                           SHAPE_TEXT                |
+                                                           GET_GLYPH_METRICS         |
+                                                           LAYOUT                    |
+                                                           UPDATE_ACTUAL_SIZE        |
+                                                           REORDER                   |
+                                                           ALIGN );
 }
 
-void Controller::ClearFontData()
+void Controller::ClearStyleData()
 {
-  mImpl->mFontDefaults->mFontId = 0u; // Remove old font ID
-  mImpl->mLogicalModel->mFontRuns.Clear();
-  mImpl->mVisualModel->mGlyphs.Clear();
-  mImpl->mVisualModel->mGlyphsToCharacters.Clear();
-  mImpl->mVisualModel->mCharactersToGlyph.Clear();
-  mImpl->mVisualModel->mCharactersPerGlyph.Clear();
-  mImpl->mVisualModel->mGlyphsPerCharacter.Clear();
-  mImpl->mVisualModel->mGlyphPositions.Clear();
-  mImpl->mVisualModel->mLines.Clear();
-  mImpl->mVisualModel->ClearCaches();
+  mImpl->mLogicalModel->mColorRuns.Clear();
+  mImpl->mLogicalModel->ClearFontDescriptionRuns();
 }
 
 Controller::Controller( ControlInterface& controlInterface )