Merge "Notify multiline hint to IMF context" into devel/master
[platform/core/uifw/dali-toolkit.git] / dali-toolkit / internal / text / text-controller.cpp
index a2fec9a..0b0b77d 100644 (file)
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2016 Samsung Electronics Co., Ltd.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -40,7 +40,6 @@ namespace
 #endif
 
 const float MAX_FLOAT = std::numeric_limits<float>::max();
-const unsigned int POINTS_PER_INCH = 72;
 
 const std::string EMPTY_STRING("");
 
@@ -68,15 +67,19 @@ namespace Text
  *
  * @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 )
+                                                 LogicalModelPtr logicalModel,
+                                                 CharacterIndex& startOfSelectedText,
+                                                 Length& lengthOfSelectedText )
 {
   const bool handlesCrossed = eventData->mLeftSelectionPosition > eventData->mRightSelectionPosition;
 
   // Get start and end position of selection
-  const CharacterIndex startOfSelectedText = handlesCrossed ? eventData->mRightSelectionPosition : eventData->mLeftSelectionPosition;
-  const Length lengthOfSelectedText = ( handlesCrossed ? eventData->mLeftSelectionPosition : eventData->mRightSelectionPosition ) - startOfSelectedText;
+  startOfSelectedText = handlesCrossed ? eventData->mRightSelectionPosition : eventData->mLeftSelectionPosition;
+  lengthOfSelectedText = ( handlesCrossed ? eventData->mLeftSelectionPosition : eventData->mRightSelectionPosition ) - startOfSelectedText;
 
   // Add the font run.
   const VectorBase::SizeType numberOfRuns = logicalModel->mFontDescriptionRuns.Count();
@@ -90,6 +93,7 @@ FontDescriptionRun& UpdateSelectionFontStyleRun( EventData* eventData,
   // Recalculate the selection highlight as the metrics may have changed.
   eventData->mUpdateLeftSelectionPosition = true;
   eventData->mUpdateRightSelectionPosition = true;
+  eventData->mUpdateHighlightBox = true;
 
   return fontDescriptionRun;
 }
@@ -107,6 +111,17 @@ void Controller::EnableTextInput( DecoratorPtr 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;
@@ -117,6 +132,131 @@ 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_LAYOUT_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_LAYOUT_SIZE        |
+                                                               REORDER );
+    }
+
+    mImpl->mAutoScrollEnabled = enable;
+    mImpl->RequestRelayout();
+  }
+  else
+  {
+    DALI_LOG_WARNING( "Attempted AutoScrolling on a non SINGLE_LINE_BOX, request ignored\n" );
+    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;
+}
+
+float Controller::GetAutoScrollLineAlignment() const
+{
+  float offset = 0.f;
+
+  if( mImpl->mVisualModel &&
+      ( 0u != mImpl->mVisualModel->mLines.Count() ) )
+  {
+    offset = ( *mImpl->mVisualModel->mLines.Begin() ).alignmentOffset;
+  }
+
+  return offset;
+}
+
+void Controller::SetHorizontalScrollEnabled( bool enable )
+{
+  if( ( NULL != mImpl->mEventData ) &&
+      mImpl->mEventData->mDecorator )
+  {
+    mImpl->mEventData->mDecorator->SetHorizontalScrollEnabled( enable );
+  }
+}
+
+bool Controller::IsHorizontalScrollEnabled() const
+{
+  if( ( NULL != mImpl->mEventData ) &&
+      mImpl->mEventData->mDecorator )
+  {
+    return mImpl->mEventData->mDecorator->IsHorizontalScrollEnabled();
+  }
+
+  return false;
+}
+
+void Controller::SetVerticalScrollEnabled( bool enable )
+{
+  if( ( NULL != mImpl->mEventData ) &&
+      mImpl->mEventData->mDecorator )
+  {
+    if( mImpl->mEventData->mDecorator )
+    {
+      mImpl->mEventData->mDecorator->SetVerticalScrollEnabled( enable );
+    }
+  }
+}
+
+bool Controller::IsVerticalScrollEnabled() const
+{
+  if( ( NULL != mImpl->mEventData ) &&
+      mImpl->mEventData->mDecorator )
+  {
+    return mImpl->mEventData->mDecorator->IsVerticalScrollEnabled();
+  }
+
+  return false;
+}
+
+void Controller::SetSmoothHandlePanEnabled( bool enable )
+{
+  if( ( NULL != mImpl->mEventData ) &&
+      mImpl->mEventData->mDecorator )
+  {
+    mImpl->mEventData->mDecorator->SetSmoothHandlePanEnabled( enable );
+  }
+}
+
+bool Controller::IsSmoothHandlePanEnabled() const
+{
+  if( ( NULL != mImpl->mEventData ) &&
+      mImpl->mEventData->mDecorator )
+  {
+    return mImpl->mEventData->mDecorator->IsSmoothHandlePanEnabled();
+  }
+
+  return false;
+}
+
 void Controller::SetText( const std::string& text )
 {
   DALI_LOG_INFO( gLogFilter, Debug::Verbose, "Controller::SetText\n" );
@@ -146,6 +286,8 @@ void Controller::SetText( const std::string& text )
 
   if( !text.empty() )
   {
+    mImpl->mVisualModel->SetTextColor( mImpl->mTextColor );
+
     MarkupProcessData markupProcessData( mImpl->mLogicalModel->mColorRuns,
                                          mImpl->mLogicalModel->mFontDescriptionRuns );
 
@@ -179,6 +321,9 @@ void Controller::SetText( const std::string& text )
     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;
 
@@ -210,9 +355,6 @@ void Controller::SetText( const std::string& text )
     mImpl->mEventData->mEventQueue.clear();
   }
 
-  // Notify IMF as text changed
-  NotifyImfManager();
-
   // Do this last since it provides callbacks into application code
   mImpl->mControlInterface.TextChanged();
 }
@@ -221,12 +363,8 @@ void Controller::GetText( std::string& text ) const
 {
   if( !mImpl->IsShowingPlaceholderText() )
   {
-    Vector<Character>& utf32Characters = mImpl->mLogicalModel->mText;
-
-    if( 0u != utf32Characters.Count() )
-    {
-      Utf32ToUtf8( &utf32Characters[0], utf32Characters.Count(), text );
-    }
+    // Retrieves the text string.
+    mImpl->GetText( 0u, text );
   }
   else
   {
@@ -234,16 +372,6 @@ void Controller::GetText( std::string& text ) const
   }
 }
 
-unsigned int Controller::GetLogicalCursorPosition() const
-{
-  if( NULL != mImpl->mEventData )
-  {
-    return mImpl->mEventData->mPrimaryCursorPosition;
-  }
-
-  return 0u;
-}
-
 void Controller::SetPlaceholderText( PlaceholderType type, const std::string& text )
 {
   if( NULL != mImpl->mEventData )
@@ -300,14 +428,11 @@ void Controller::SetDefaultFontFamily( const std::string& defaultFontFamily )
 
   mImpl->mFontDefaults->mFontDescription.family = defaultFontFamily;
   DALI_LOG_INFO( gLogFilter, Debug::General, "Controller::SetDefaultFontFamily %s\n", defaultFontFamily.c_str());
-  mImpl->mFontDefaults->familyDefined = true;
+  mImpl->mFontDefaults->familyDefined = !defaultFontFamily.empty();
 
   // Clear the font-specific data
   ClearFontData();
 
-  mImpl->mOperationsPending = ALL_OPERATIONS;
-  mImpl->mRecalculateNaturalSize = true;
-
   mImpl->RequestRelayout();
 }
 
@@ -321,26 +446,6 @@ const std::string& Controller::GetDefaultFontFamily() const
   return EMPTY_STRING;
 }
 
-void Controller::SetDefaultFontStyle( const std::string& style )
-{
-  if( NULL == mImpl->mFontDefaults )
-  {
-    mImpl->mFontDefaults = new FontDefaults();
-  }
-
-  mImpl->mFontDefaults->mFontStyle = style;
-}
-
-const std::string& Controller::GetDefaultFontStyle() const
-{
-  if( NULL != mImpl->mFontDefaults )
-  {
-    return mImpl->mFontDefaults->mFontStyle;
-  }
-
-  return EMPTY_STRING;
-}
-
 void Controller::SetDefaultFontWeight( FontWeight weight )
 {
   if( NULL == mImpl->mFontDefaults )
@@ -354,12 +459,14 @@ void Controller::SetDefaultFontWeight( FontWeight weight )
   // Clear the font-specific data
   ClearFontData();
 
-  mImpl->mOperationsPending = ALL_OPERATIONS;
-  mImpl->mRecalculateNaturalSize = true;
-
   mImpl->RequestRelayout();
 }
 
+bool Controller::IsDefaultFontWeightDefined() const
+{
+  return mImpl->mFontDefaults->weightDefined;
+}
+
 FontWeight Controller::GetDefaultFontWeight() const
 {
   if( NULL != mImpl->mFontDefaults )
@@ -383,12 +490,14 @@ void Controller::SetDefaultFontWidth( FontWidth width )
   // Clear the font-specific data
   ClearFontData();
 
-  mImpl->mOperationsPending = ALL_OPERATIONS;
-  mImpl->mRecalculateNaturalSize = true;
-
   mImpl->RequestRelayout();
 }
 
+bool Controller::IsDefaultFontWidthDefined() const
+{
+  return mImpl->mFontDefaults->widthDefined;
+}
+
 FontWidth Controller::GetDefaultFontWidth() const
 {
   if( NULL != mImpl->mFontDefaults )
@@ -412,12 +521,14 @@ void Controller::SetDefaultFontSlant( FontSlant slant )
   // Clear the font-specific data
   ClearFontData();
 
-  mImpl->mOperationsPending = ALL_OPERATIONS;
-  mImpl->mRecalculateNaturalSize = true;
-
   mImpl->RequestRelayout();
 }
 
+bool Controller::IsDefaultFontSlantDefined() const
+{
+  return mImpl->mFontDefaults->slantDefined;
+}
+
 FontSlant Controller::GetDefaultFontSlant() const
 {
   if( NULL != mImpl->mFontDefaults )
@@ -438,21 +549,9 @@ void Controller::SetDefaultPointSize( float pointSize )
   mImpl->mFontDefaults->mDefaultPointSize = pointSize;
   mImpl->mFontDefaults->sizeDefined = true;
 
-  unsigned int horizontalDpi( 0u );
-  unsigned int verticalDpi( 0u );
-  mImpl->mFontClient.GetDpi( horizontalDpi, verticalDpi );
-
-  // Adjust the metrics if the fixed-size font should be down-scaled
-  int maxEmojiSize( pointSize/POINTS_PER_INCH * verticalDpi );
-  DALI_LOG_INFO( gLogFilter, Debug::General, "Controller::SetDefaultPointSize %p setting MaxEmojiSize %d\n", this, maxEmojiSize );
-  mImpl->mMetrics->SetMaxEmojiSize( maxEmojiSize );
-
   // Clear the font-specific data
   ClearFontData();
 
-  mImpl->mOperationsPending = ALL_OPERATIONS;
-  mImpl->mRecalculateNaturalSize = true;
-
   mImpl->RequestRelayout();
 }
 
@@ -466,18 +565,17 @@ 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\n");
 
   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();
   }
 }
@@ -499,7 +597,9 @@ 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;
 
@@ -508,8 +608,8 @@ bool Controller::RemoveText( int cursorOffset, int numberOfChars )
     return removed;
   }
 
-  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 );
+  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() )
   {
@@ -525,34 +625,43 @@ 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.
 
-      // Set first the default input style.
-      mImpl->RetrieveDefaultInputStyle( mImpl->mEventData->mInputStyle );
+      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 );
+        // Update the input style.
+        mImpl->mLogicalModel->RetrieveStyle( cursorIndex, mImpl->mEventData->mInputStyle );
+      }
 
-      // Remove the text's style before removing the text.
-      mImpl->mLogicalModel->UpdateTextStyleRuns( cursorIndex, -numberOfChars );
+      // 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 );
+      mImpl->mEventData->mScrollAfterDelete = true;
+
+      DALI_LOG_INFO( gLogFilter, Debug::General, "Controller::RemoveText %p removed %d\n", this, numberOfCharacters );
       removed = true;
     }
   }
@@ -608,6 +717,26 @@ const Vector4& Controller::GetShadowColor() const
   return mImpl->mVisualModel->GetShadowColor();
 }
 
+void Controller::SetDefaultShadowProperties( const std::string& shadowProperties )
+{
+  if( NULL == mImpl->mShadowDefaults )
+  {
+    mImpl->mShadowDefaults = new ShadowDefaults();
+  }
+
+  mImpl->mShadowDefaults->properties = shadowProperties;
+}
+
+const std::string& Controller::GetDefaultShadowProperties() const
+{
+  if( NULL != mImpl->mShadowDefaults )
+  {
+    return mImpl->mShadowDefaults->properties;
+  }
+
+  return EMPTY_STRING;
+}
+
 void Controller::SetUnderlineColor( const Vector4& color )
 {
   mImpl->mVisualModel->SetUnderlineColor( color );
@@ -644,11 +773,83 @@ float Controller::GetUnderlineHeight() const
   return mImpl->mVisualModel->GetUnderlineHeight();
 }
 
+void Controller::SetDefaultUnderlineProperties( const std::string& underlineProperties )
+{
+  if( NULL == mImpl->mUnderlineDefaults )
+  {
+    mImpl->mUnderlineDefaults = new UnderlineDefaults();
+  }
+
+  mImpl->mUnderlineDefaults->properties = underlineProperties;
+}
+
+const std::string& Controller::GetDefaultUnderlineProperties() const
+{
+  if( NULL != mImpl->mUnderlineDefaults )
+  {
+    return mImpl->mUnderlineDefaults->properties;
+  }
+
+  return EMPTY_STRING;
+}
+
+void Controller::SetDefaultEmbossProperties( const std::string& embossProperties )
+{
+  if( NULL == mImpl->mEmbossDefaults )
+  {
+    mImpl->mEmbossDefaults = new EmbossDefaults();
+  }
+
+  mImpl->mEmbossDefaults->properties = embossProperties;
+}
+
+const std::string& Controller::GetDefaultEmbossProperties() const
+{
+  if( NULL != mImpl->mEmbossDefaults )
+  {
+    return mImpl->mEmbossDefaults->properties;
+  }
+
+  return EMPTY_STRING;
+}
+
+void Controller::SetDefaultOutlineProperties( const std::string& outlineProperties )
+{
+  if( NULL == mImpl->mOutlineDefaults )
+  {
+    mImpl->mOutlineDefaults = new OutlineDefaults();
+  }
+
+  mImpl->mOutlineDefaults->properties = outlineProperties;
+}
+
+const std::string& Controller::GetDefaultOutlineProperties() const
+{
+  if( NULL != mImpl->mOutlineDefaults )
+  {
+    return mImpl->mOutlineDefaults->properties;
+  }
+
+  return EMPTY_STRING;
+}
+
+void Controller::SetDefaultLineSpacing( float lineSpacing )
+{
+  //TODO finish implementation
+  mImpl->mLayoutEngine.SetDefaultLineSpacing( lineSpacing );
+}
+
+float Controller::GetDefaultLineSpacing() const
+{
+  return mImpl->mLayoutEngine.GetDefaultLineSpacing();
+}
+
 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 )
     {
@@ -670,6 +871,10 @@ void Controller::SetInputColor( const Vector4& color )
       // 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;
     }
   }
 }
@@ -695,8 +900,12 @@ void Controller::SetInputFontFamily( const std::string& fontFamily )
 
     if( EventData::SELECTING == mImpl->mEventData->mState )
     {
+      CharacterIndex startOfSelectedText = 0u;
+      Length lengthOfSelectedText = 0u;
       FontDescriptionRun& fontDescriptionRun = UpdateSelectionFontStyleRun( mImpl->mEventData,
-                                                                            mImpl->mLogicalModel );
+                                                                            mImpl->mLogicalModel,
+                                                                            startOfSelectedText,
+                                                                            lengthOfSelectedText );
 
       fontDescriptionRun.familyLength = fontFamily.size();
       fontDescriptionRun.familyName = new char[fontDescriptionRun.familyLength];
@@ -706,13 +915,25 @@ void Controller::SetInputFontFamily( const std::string& fontFamily )
       // 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 = ALL_OPERATIONS;
+      mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending |
+                                                               VALIDATE_FONTS            |
+                                                               SHAPE_TEXT                |
+                                                               GET_GLYPH_METRICS         |
+                                                               LAYOUT                    |
+                                                               UPDATE_LAYOUT_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->mUpdateHighlightBox = true;
       mImpl->mEventData->mScrollAfterUpdatePosition = true;
     }
   }
@@ -729,25 +950,6 @@ const std::string& Controller::GetInputFontFamily() const
   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 )
@@ -757,25 +959,53 @@ void Controller::SetInputFontWeight( FontWeight weight )
 
     if( EventData::SELECTING == mImpl->mEventData->mState )
     {
+      CharacterIndex startOfSelectedText = 0u;
+      Length lengthOfSelectedText = 0u;
       FontDescriptionRun& fontDescriptionRun = UpdateSelectionFontStyleRun( mImpl->mEventData,
-                                                                            mImpl->mLogicalModel );
+                                                                            mImpl->mLogicalModel,
+                                                                            startOfSelectedText,
+                                                                            lengthOfSelectedText );
 
       fontDescriptionRun.weight = weight;
       fontDescriptionRun.weightDefined = true;
 
       // Request to relayout.
-      mImpl->mOperationsPending = ALL_OPERATIONS;
+      mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending |
+                                                               VALIDATE_FONTS            |
+                                                               SHAPE_TEXT                |
+                                                               GET_GLYPH_METRICS         |
+                                                               LAYOUT                    |
+                                                               UPDATE_LAYOUT_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->mUpdateHighlightBox = true;
       mImpl->mEventData->mScrollAfterUpdatePosition = true;
     }
   }
 }
 
+bool Controller::IsInputFontWeightDefined() const
+{
+  bool defined = false;
+
+  if( NULL != mImpl->mEventData )
+  {
+    defined = mImpl->mEventData->mInputStyle.weightDefined;
+  }
+
+  return defined;
+}
+
 FontWeight Controller::GetInputFontWeight() const
 {
   if( NULL != mImpl->mEventData )
@@ -795,109 +1025,271 @@ void Controller::SetInputFontWidth( FontWidth width )
 
     if( EventData::SELECTING == mImpl->mEventData->mState )
     {
+      CharacterIndex startOfSelectedText = 0u;
+      Length lengthOfSelectedText = 0u;
       FontDescriptionRun& fontDescriptionRun = UpdateSelectionFontStyleRun( mImpl->mEventData,
-                                                                            mImpl->mLogicalModel );
+                                                                            mImpl->mLogicalModel,
+                                                                            startOfSelectedText,
+                                                                            lengthOfSelectedText );
 
       fontDescriptionRun.width = width;
       fontDescriptionRun.widthDefined = true;
 
       // Request to relayout.
-      mImpl->mOperationsPending = ALL_OPERATIONS;
+      mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending |
+                                                               VALIDATE_FONTS            |
+                                                               SHAPE_TEXT                |
+                                                               GET_GLYPH_METRICS         |
+                                                               LAYOUT                    |
+                                                               UPDATE_LAYOUT_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->mUpdateHighlightBox = true;
+      mImpl->mEventData->mScrollAfterUpdatePosition = true;
+    }
+  }
+}
+
+bool Controller::IsInputFontWidthDefined() const
+{
+  bool defined = false;
+
+  if( NULL != mImpl->mEventData )
+  {
+    defined = mImpl->mEventData->mInputStyle.widthDefined;
+  }
+
+  return defined;
+}
+
+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_LAYOUT_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->mUpdateHighlightBox = true;
+      mImpl->mEventData->mScrollAfterUpdatePosition = true;
+    }
+  }
+}
+
+bool Controller::IsInputFontSlantDefined() const
+{
+  bool defined = false;
+
+  if( NULL != mImpl->mEventData )
+  {
+    defined = mImpl->mEventData->mInputStyle.slantDefined;
+  }
+
+  return defined;
+}
+
+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_LAYOUT_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->mUpdateHighlightBox = true;
       mImpl->mEventData->mScrollAfterUpdatePosition = true;
     }
   }
 }
 
-FontWidth Controller::GetInputFontWidth() const
+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::SetInputLineSpacing( float lineSpacing )
+{
+  if( NULL != mImpl->mEventData )
+  {
+    mImpl->mEventData->mInputStyle.lineSpacing = lineSpacing;
+  }
+}
+
+float Controller::GetInputLineSpacing() const
+{
+  if( NULL != mImpl->mEventData )
+  {
+    return mImpl->mEventData->mInputStyle.lineSpacing;
+  }
+
+  return 0.f;
+}
+
+void Controller::SetInputShadowProperties( const std::string& shadowProperties )
+{
+  if( NULL != mImpl->mEventData )
+  {
+    mImpl->mEventData->mInputStyle.shadowProperties = shadowProperties;
+  }
+}
+
+const std::string& Controller::GetInputShadowProperties() const
+{
+  if( NULL != mImpl->mEventData )
+  {
+    return mImpl->mEventData->mInputStyle.shadowProperties;
+  }
+
+  return GetDefaultShadowProperties();
+}
+
+void Controller::SetInputUnderlineProperties( const std::string& underlineProperties )
 {
   if( NULL != mImpl->mEventData )
   {
-    return mImpl->mEventData->mInputStyle.width;
+    mImpl->mEventData->mInputStyle.underlineProperties = underlineProperties;
   }
-
-  return GetDefaultFontWidth();
 }
 
-void Controller::SetInputFontSlant( FontSlant slant )
+const std::string& Controller::GetInputUnderlineProperties() const
 {
   if( NULL != mImpl->mEventData )
   {
-    mImpl->mEventData->mInputStyle.slant = slant;
-    mImpl->mEventData->mInputStyle.slantDefined = true;
-
-    if( EventData::SELECTING == mImpl->mEventData->mState )
-    {
-      FontDescriptionRun& fontDescriptionRun = UpdateSelectionFontStyleRun( mImpl->mEventData,
-                                                                            mImpl->mLogicalModel );
-
-      fontDescriptionRun.slant = slant;
-      fontDescriptionRun.slantDefined = true;
+    return mImpl->mEventData->mInputStyle.underlineProperties;
+  }
 
-      // Request to relayout.
-      mImpl->mOperationsPending = ALL_OPERATIONS;
-      mImpl->mRecalculateNaturalSize = true;
-      mImpl->RequestRelayout();
+  return GetDefaultUnderlineProperties();
+}
 
-      // As the font might change, recalculate the handle positions is needed.
-      mImpl->mEventData->mUpdateLeftSelectionPosition = true;
-      mImpl->mEventData->mUpdateRightSelectionPosition = true;
-      mImpl->mEventData->mScrollAfterUpdatePosition = true;
-    }
+void Controller::SetInputEmbossProperties( const std::string& embossProperties )
+{
+  if( NULL != mImpl->mEventData )
+  {
+    mImpl->mEventData->mInputStyle.embossProperties = embossProperties;
   }
 }
 
-FontSlant Controller::GetInputFontSlant() const
+const std::string& Controller::GetInputEmbossProperties() const
 {
   if( NULL != mImpl->mEventData )
   {
-    return mImpl->mEventData->mInputStyle.slant;
+    return mImpl->mEventData->mInputStyle.embossProperties;
   }
 
-  return GetDefaultFontSlant();
+  return GetDefaultEmbossProperties();
 }
 
-void Controller::SetInputFontPointSize( float size )
+void Controller::SetInputOutlineProperties( const std::string& outlineProperties )
 {
   if( NULL != mImpl->mEventData )
   {
-    mImpl->mEventData->mInputStyle.size = size;
-
-    if( EventData::SELECTING == mImpl->mEventData->mState )
-    {
-      FontDescriptionRun& fontDescriptionRun = UpdateSelectionFontStyleRun( mImpl->mEventData,
-                                                                            mImpl->mLogicalModel );
-
-      fontDescriptionRun.size = static_cast<PointSize26Dot6>( size * 64.f );
-      fontDescriptionRun.sizeDefined = true;
-
-      // Request to relayout.
-      mImpl->mOperationsPending = ALL_OPERATIONS;
-      mImpl->mRecalculateNaturalSize = true;
-      mImpl->RequestRelayout();
-
-      // As the font might change, recalculate the handle positions is needed.
-      mImpl->mEventData->mUpdateLeftSelectionPosition = true;
-      mImpl->mEventData->mUpdateRightSelectionPosition = true;
-      mImpl->mEventData->mScrollAfterUpdatePosition = true;
-    }
+    mImpl->mEventData->mInputStyle.outlineProperties = outlineProperties;
   }
 }
 
-float Controller::GetInputFontPointSize() const
+const std::string& Controller::GetInputOutlineProperties() const
 {
   if( NULL != mImpl->mEventData )
   {
-    return mImpl->mEventData->mInputStyle.size;
+    return mImpl->mEventData->mInputStyle.outlineProperties;
   }
 
-  // Return the default font's point size if there is no EventData.
-  return GetDefaultPointSize();
+  return GetDefaultOutlineProperties();
 }
 
 void Controller::SetEnableCursorBlink( bool enable )
@@ -928,17 +1320,7 @@ bool Controller::GetEnableCursorBlink() const
 
 const Vector2& Controller::GetScrollPosition() const
 {
-  if( NULL != mImpl->mEventData )
-  {
-    return mImpl->mEventData->mScrollPosition;
-  }
-
-  return Vector2::ZERO;
-}
-
-const Vector2& Controller::GetAlignmentOffset() const
-{
-  return mImpl->mAlignmentOffset;
+  return mImpl->mScrollPosition;
 }
 
 Vector3 Controller::GetNaturalSize()
@@ -963,20 +1345,28 @@ 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
@@ -985,6 +1375,12 @@ 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
@@ -1021,21 +1417,38 @@ 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
@@ -1047,21 +1460,27 @@ float Controller::GetHeightForWidth( float width )
   return layoutSize.height;
 }
 
-bool Controller::Relayout( const Size& size )
+Controller::UpdateTextType 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"  );
+
+  UpdateTextType updateTextType = NONE_UPDATED;
 
   if( ( size.width < Math::MACHINE_EPSILON_1000 ) || ( size.height < Math::MACHINE_EPSILON_1000 ) )
   {
-    bool glyphsRemoved( false );
     if( 0u != mImpl->mVisualModel->mGlyphPositions.Count() )
     {
       mImpl->mVisualModel->mGlyphPositions.Clear();
-      glyphsRemoved = true;
+      updateTextType = MODEL_UPDATED;
     }
+
+    // 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;
+
+    return updateTextType;
   }
 
   // Whether a new size has been set.
@@ -1075,50 +1494,54 @@ bool Controller::Relayout( const Size& size )
     mImpl->mOperationsPending = static_cast<OperationsMask>( mImpl->mOperationsPending |
                                                              LAYOUT                    |
                                                              ALIGN                     |
-                                                             UPDATE_ACTUAL_SIZE        |
+                                                             UPDATE_LAYOUT_SIZE        |
                                                              REORDER );
-
-    mImpl->mVisualModel->mControlSize = size;
+    // Set the update info to relayout the whole text.
+    mImpl->mTextUpdateInfo.mFullRelayoutNeeded = true;
+    mImpl->mTextUpdateInfo.mCharacterIndex = 0u;
   }
 
   // Whether there are modify events.
-  const bool isModifyEventsEmpty = 0u == mImpl->mModifyEvents.Count();
-
-  // Make sure the model is up-to-date before layouting.
-  ProcessModifyEvents();
-  mImpl->UpdateModel( mImpl->mOperationsPending );
-
-  // Style operations that need to be done if the text is modified.
-  if( !isModifyEventsEmpty )
+  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 );
   }
 
-  // Apply the style runs if text is modified.
-  bool updated = mImpl->UpdateModelStyle( mImpl->mOperationsPending );
+  // Make sure the model is up-to-date before layouting.
+  ProcessModifyEvents();
+  bool updated = mImpl->UpdateModel( mImpl->mOperationsPending );
 
   // Layout the text.
   Size layoutSize;
-  updated = DoRelayout( mImpl->mVisualModel->mControlSize,
+  updated = DoRelayout( size,
                         mImpl->mOperationsPending,
                         layoutSize ) || updated;
 
+  if( updated )
+  {
+    updateTextType = MODEL_UPDATED;
+  }
+
   // Do not re-do any operation until something changes.
   mImpl->mOperationsPending = NO_OPERATION;
 
   // 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).
+  // Keep the current offset as it will be used to update the decorator's positions (if the size changes).
   Vector2 offset;
   if( newSize && isEditable )
   {
-    offset = mImpl->mAlignmentOffset + mImpl->mEventData->mScrollPosition;
+    offset = mImpl->mScrollPosition;
   }
 
-  // After doing the text layout, the alignment offset to place the actor in the desired position can be calculated.
-  CalculateTextAlignment( size );
+  if( !isEditable || !IsMultiLineEnabled() )
+  {
+    // After doing the text layout, the vertical offset to place the actor in the desired position can be calculated.
+    CalculateVerticalOffset( size );
+  }
 
   if( isEditable )
   {
@@ -1128,15 +1551,21 @@ bool Controller::Relayout( const Size& size )
       mImpl->ClampHorizontalScroll( layoutSize );
 
       // Update the decorator's positions is needed if there is a new size.
-      mImpl->mEventData->mDecorator->UpdatePositions( mImpl->mAlignmentOffset + mImpl->mEventData->mScrollPosition - offset );
+      mImpl->mEventData->mDecorator->UpdatePositions( mImpl->mScrollPosition - offset );
     }
 
     // Move the cursor, grab handle etc.
-    updated = mImpl->ProcessInputEvents() || updated;
+    if( mImpl->ProcessInputEvents() )
+    {
+      updateTextType = static_cast<UpdateTextType>( updateTextType | DECORATOR_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;
+
+  return updateTextType;
 }
 
 void Controller::ProcessModifyEvents()
@@ -1191,11 +1620,17 @@ 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;
 
@@ -1223,26 +1658,18 @@ void Controller::ResetScrollPosition()
   if( NULL != mImpl->mEventData )
   {
     // Reset the scroll position.
-    mImpl->mEventData->mScrollPosition = Vector2::ZERO;
+    mImpl->mScrollPosition = Vector2::ZERO;
     mImpl->mEventData->mScrollAfterUpdatePosition = true;
   }
 }
 
 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()
@@ -1254,26 +1681,11 @@ void Controller::TextInsertedEvent()
     return;
   }
 
-  // TODO - Optimize this
-  ClearModelData();
-
   // 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::IsEditingState( mImpl->mEventData->mState ) )
-  {
-    mImpl->mEventData->mUpdateCursorPosition = true;
-    mImpl->mEventData->mScrollAfterUpdatePosition = true;
-  }
 }
 
 void Controller::TextDeletedEvent()
@@ -1285,26 +1697,11 @@ void Controller::TextDeletedEvent()
     return;
   }
 
-  // TODO - Optimize this
-  ClearModelData();
-
   // 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()
-  mImpl->mEventData->mUpdateCursorPosition = true;
-  if( 0u != mImpl->mLogicalModel->mText.Count() )
-  {
-    mImpl->mEventData->mScrollAfterDelete = true;
-  }
 }
 
 bool Controller::DoRelayout( const Size& size,
@@ -1317,16 +1714,38 @@ 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;
+
+  // Get the current layout size.
+  layoutSize = mImpl->mVisualModel->GetLayoutSize();
+
+  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_LAYOUT_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;
@@ -1339,8 +1758,6 @@ bool Controller::DoRelayout( const Size& size,
     const Vector<CharacterIndex>& glyphsToCharactersMap = mImpl->mVisualModel->mGlyphsToCharacters;
     const Vector<Length>& charactersPerGlyph = mImpl->mVisualModel->mCharactersPerGlyph;
     const Character* const textBuffer = mImpl->mLogicalModel->mText.Begin();
-    const Vector<GlyphIndex>& charactersToGlyph = mImpl->mVisualModel->mCharactersToGlyph;
-    const Vector<Length>& glyphsPerCharacter = mImpl->mVisualModel->mGlyphsPerCharacter;
 
     // Set the layout parameters.
     LayoutParameters layoutParameters( size,
@@ -1351,43 +1768,44 @@ bool Controller::DoRelayout( const Size& size,
                                        glyphs.Begin(),
                                        glyphsToCharactersMap.Begin(),
                                        charactersPerGlyph.Begin(),
-                                       charactersToGlyph.Begin(),
-                                       glyphsPerCharacter.Begin(),
-                                       numberOfGlyphs );
-
-    // 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() );
+                                       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 = 0u;
+    layoutParameters.startGlyphIndex = startGlyphIndex;
     layoutParameters.numberOfGlyphs = numberOfGlyphs;
+    layoutParameters.startLineIndex = mImpl->mTextUpdateInfo.mStartLineIndex;
+    layoutParameters.estimatedNumberOfLines = mImpl->mTextUpdateInfo.mEstimatedNumberOfLines;
 
     // Update the visual model.
+    Size newLayoutSize;
     viewUpdated = mImpl->mLayoutEngine.LayoutText( layoutParameters,
                                                    glyphPositions,
-                                                   lines,
-                                                   layoutSize );
+                                                   mImpl->mVisualModel->mLines,
+                                                   newLayoutSize );
+
+    viewUpdated = viewUpdated || ( newLayoutSize != layoutSize );
 
     if( viewUpdated )
     {
+      layoutSize = newLayoutSize;
+
+      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;
@@ -1397,69 +1815,52 @@ bool Controller::DoRelayout( const Size& size,
         {
           // Get the lines
           const Length numberOfLines = mImpl->mVisualModel->mLines.Count();
-          const CharacterIndex startIndex = 0u;
-          const Length requestedNumberOfCharacters = mImpl->mLogicalModel->mText.Count();
 
           // Reorder the lines.
           bidirectionalLineInfo.Reserve( numberOfLines ); // Reserve because is not known yet how many lines have right to left characters.
           ReorderLines( bidirectionalInfo,
                         startIndex,
                         requestedNumberOfCharacters,
-                        lines,
+                        mImpl->mVisualModel->mLines,
                         bidirectionalLineInfo );
 
           // Set the bidirectional info per line into the layout parameters.
           layoutParameters.lineBidirectionalInfoRunsBuffer = bidirectionalLineInfo.Begin();
           layoutParameters.numberOfBidirectionalInfoRuns = bidirectionalLineInfo.Count();
 
-          // Set the bidirectional info into the model.
-          mImpl->mLogicalModel->SetVisualToLogicalMap( layoutParameters.lineBidirectionalInfoRunsBuffer,
-                                                       layoutParameters.numberOfBidirectionalInfoRuns,
-                                                       startIndex,
-                                                       requestedNumberOfCharacters );
-
           // 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 = bidirectionalLineInfo.Begin(),
-                 endIt = bidirectionalLineInfo.End();
-               it != endIt;
-               ++it )
+          if ( ( NO_OPERATION != ( UPDATE_DIRECTION & operations ) ) && ( numberOfLines > 0 ) )
           {
-            BidirectionalLineInfoRun& bidiLineInfo = *it;
-
-            free( bidiLineInfo.visualToLogicalMap );
-            bidiLineInfo.visualToLogicalMap = NULL;
+            const LineRun* const firstline = mImpl->mVisualModel->mLines.Begin();
+            if ( firstline )
+            {
+              mImpl->mAutoScrollDirectionRTL = firstline->direction;
+            }
           }
-
-          bidirectionalLineInfo.Clear();
         }
       } // REORDER
 
-      // Sets the actual size.
-      if( UPDATE_ACTUAL_SIZE & operations )
+      // Sets the layout size.
+      if( NO_OPERATION != ( UPDATE_LAYOUT_SIZE & operations ) )
       {
         mImpl->mVisualModel->SetLayoutSize( layoutSize );
       }
     } // view updated
-  }
-  else
-  {
-    layoutSize = mImpl->mVisualModel->GetLayoutSize();
+
+    // Store the size used to layout the text.
+    mImpl->mVisualModel->mControlSize = size;
   }
 
-  if( ALIGN & operations )
+  if( NO_OPERATION != ( ALIGN & operations ) )
   {
     // The laid-out lines.
     Vector<LineRun>& lines = mImpl->mVisualModel->mLines;
 
-    const CharacterIndex startIndex = 0u;
-    const Length requestedNumberOfCharacters = mImpl->mLogicalModel->mText.Count();
-
     mImpl->mLayoutEngine.Align( size,
                                 startIndex,
                                 requestedNumberOfCharacters,
@@ -1467,7 +1868,11 @@ bool Controller::DoRelayout( const Size& size,
 
     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;
 }
@@ -1483,7 +1888,7 @@ void Controller::SetMultiLineEnabled( bool enable )
 
     // Set the flags to redo the layout operations
     const OperationsMask layoutOperations =  static_cast<OperationsMask>( LAYOUT             |
-                                                                          UPDATE_ACTUAL_SIZE |
+                                                                          UPDATE_LAYOUT_SIZE |
                                                                           ALIGN              |
                                                                           REORDER );
 
@@ -1535,7 +1940,7 @@ LayoutEngine::VerticalAlignment Controller::GetVerticalAlignment() const
   return mImpl->mLayoutEngine.GetVerticalAlignment();
 }
 
-void Controller::CalculateTextAlignment( const Size& controlSize )
+void Controller::CalculateVerticalOffset( const Size& controlSize )
 {
   Size layoutSize = mImpl->mVisualModel->GetLayoutSize();
 
@@ -1545,71 +1950,21 @@ void Controller::CalculateTextAlignment( const Size& controlSize )
     layoutSize.height = mImpl->GetDefaultFontLineHeight();
   }
 
-  if( LayoutEngine::SINGLE_LINE_BOX == mImpl->mLayoutEngine.GetLayout() )
-  {
-    // Get the direction of the first character.
-    const CharacterDirection firstParagraphDirection = mImpl->mLogicalModel->GetCharacterDirection( 0u );
-
-    // If the first paragraph is right to left swap ALIGN_BEGIN and ALIGN_END;
-    LayoutEngine::HorizontalAlignment horizontalAlignment = mImpl->mLayoutEngine.GetHorizontalAlignment();
-    if( firstParagraphDirection )
-    {
-      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;
-        }
-      }
-    }
-
-    switch( horizontalAlignment )
-    {
-      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;
-      }
-    }
-  }
-
-  const LayoutEngine::VerticalAlignment verticalAlignment = mImpl->mLayoutEngine.GetVerticalAlignment();
-  switch( verticalAlignment )
+  switch( mImpl->mLayoutEngine.GetVerticalAlignment() )
   {
     case LayoutEngine::VERTICAL_ALIGN_TOP:
     {
-      mImpl->mAlignmentOffset.y = 0.f;
+      mImpl->mScrollPosition.y = 0.f;
       break;
     }
     case LayoutEngine::VERTICAL_ALIGN_CENTER:
     {
-      mImpl->mAlignmentOffset.y = floorf( 0.5f * ( controlSize.height - layoutSize.height ) ); // try to avoid pixel alignment.
+      mImpl->mScrollPosition.y = floorf( 0.5f * ( controlSize.height - layoutSize.height ) ); // try to avoid pixel alignment.
       break;
     }
     case LayoutEngine::VERTICAL_ALIGN_BOTTOM:
     {
-      mImpl->mAlignmentOffset.y = controlSize.height - layoutSize.height;
+      mImpl->mScrollPosition.y = controlSize.height - layoutSize.height;
       break;
     }
   }
@@ -1637,7 +1992,7 @@ void Controller::KeyboardFocusGainEvent()
       mImpl->ChangeState( EventData::EDITING );
       mImpl->mEventData->mUpdateCursorPosition = true; //If editing started without tap event, cursor update must be triggered.
     }
-
+    mImpl->NotifyImfMultiLineStatus();
     if( mImpl->IsShowingPlaceholderText() )
     {
       // Show alternative placeholder-text when editing
@@ -1729,9 +2084,13 @@ 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 ) &&
+         ( Dali::DALI_KEY_SHIFT_LEFT != keyCode ) )
     {
+      // Should not change the state if the key is the shift send by the imf manager.
+      // Otherwise, when the state is SELECTING the text controller can't send the right
+      // surrounding info to the imf.
       mImpl->ChangeState( EventData::EDITING );
     }
 
@@ -1766,26 +2125,28 @@ void Controller::InsertText( const std::string& text, Controller::InsertType typ
   // TODO: At the moment the underline runs are only for pre-edit.
   mImpl->mVisualModel->mUnderlineRuns.Clear();
 
-  Vector<Character> utf32Characters;
-  Length characterCount( 0u );
+  // Keep the current number of characters.
+  const Length currentNumberOfCharacters = mImpl->IsShowingRealText() ? mImpl->mLogicalModel->mText.Count() : 0u;
 
-  // Remove the previous IMF pre-edit (predicitive text)
-  if( mImpl->mEventData->mPreEditFlag &&
-      ( 0 != mImpl->mEventData->mPreEditLength ) )
+  // Remove the previous IMF pre-edit.
+  if( mImpl->mEventData->mPreEditFlag && ( 0u != mImpl->mEventData->mPreEditLength ) )
   {
-    CharacterIndex offset = mImpl->mEventData->mPrimaryCursorPosition - mImpl->mEventData->mPreEditStartPosition;
-
-    removedPrevious = RemoveText( -static_cast<int>(offset), mImpl->mEventData->mPreEditLength );
+    removedPrevious = RemoveText( -static_cast<int>( mImpl->mEventData->mPrimaryCursorPosition - mImpl->mEventData->mPreEditStartPosition ),
+                                  mImpl->mEventData->mPreEditLength,
+                                  DONT_UPDATE_INPUT_STYLE );
 
     mImpl->mEventData->mPrimaryCursorPosition = mImpl->mEventData->mPreEditStartPosition;
-    mImpl->mEventData->mPreEditLength = 0;
+    mImpl->mEventData->mPreEditLength = 0u;
   }
   else
   {
-    // Remove the previous Selection
+    // Remove the previous Selection.
     removedPrevious = RemoveSelectedText();
   }
 
+  Vector<Character> utf32Characters;
+  Length characterCount = 0u;
+
   if( !text.empty() )
   {
     //  Convert text into UTF-32
@@ -1823,7 +2184,7 @@ void Controller::InsertText( const std::string& text, Controller::InsertType typ
     {
       if( !mImpl->mEventData->mPreEditFlag )
       {
-        DALI_LOG_INFO( gLogFilter, Debug::Verbose, "Entered PreEdit state" );
+        DALI_LOG_INFO( gLogFilter, Debug::Verbose, "Entered PreEdit state\n" );
 
         // Record the start of the pre-edit text
         mImpl->mEventData->mPreEditStartPosition = mImpl->mEventData->mPrimaryCursorPosition;
@@ -1837,7 +2198,7 @@ void Controller::InsertText( const std::string& text, Controller::InsertType typ
 
     const Length numberOfCharactersInModel = mImpl->mLogicalModel->mText.Count();
 
-    // Restrict new text to fit within Maximum characters setting
+    // Restrict new text to fit within Maximum characters setting.
     Length maxSizeOfNewText = std::min( ( mImpl->mMaximumNumberOfCharacters - numberOfCharactersInModel ), characterCount );
     maxLengthReached = ( characterCount > maxSizeOfNewText );
 
@@ -1854,10 +2215,11 @@ void Controller::InsertText( const std::string& text, Controller::InsertType typ
 
     // 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;
+    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;
@@ -1939,11 +2301,18 @@ 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 );
   }
 
+  const Length numberOfCharacters = mImpl->IsShowingRealText() ? mImpl->mLogicalModel->mText.Count() : 0u;
+
   if( ( 0u == mImpl->mLogicalModel->mText.Count() ) &&
       mImpl->IsPlaceholderAvailable() )
   {
@@ -1957,6 +2326,16 @@ void Controller::InsertText( const std::string& text, Controller::InsertType typ
   {
     // Queue an inserted event
     mImpl->QueueModifyEvent( ModifyEvent::TEXT_INSERTED );
+
+    mImpl->mEventData->mUpdateCursorPosition = true;
+    if( numberOfCharacters < currentNumberOfCharacters )
+    {
+      mImpl->mEventData->mScrollAfterDelete = true;
+    }
+    else
+    {
+      mImpl->mEventData->mScrollAfterUpdatePosition = true;
+    }
   }
 
   if( maxLengthReached )
@@ -2002,10 +2381,10 @@ void Controller::TapEvent( unsigned int tapCount, float x, float y )
       // This is to avoid unnecessary relayouts when tapping an empty text-field
       bool relayoutNeeded( false );
 
-      if( ( EventData::EDITING_WITH_PASTE_POPUP == mImpl->mEventData->mState ) ||
+      if( ( EventData::EDITING_WITH_POPUP == mImpl->mEventData->mState ) ||
           ( EventData::EDITING_WITH_PASTE_POPUP == mImpl->mEventData->mState ) )
       {
-        mImpl->ChangeState( EventData::EDITING_WITH_GRAB_HANDLE);  // If Popup shown hide it here so can be shown again if required.
+        mImpl->ChangeState( EventData::EDITING_WITH_GRAB_HANDLE );  // If Popup shown hide it here so can be shown again if required.
       }
 
       if( mImpl->IsShowingRealText() && ( EventData::INACTIVE != mImpl->mEventData->mState ) )
@@ -2018,6 +2397,7 @@ void Controller::TapEvent( unsigned int tapCount, float x, float y )
         }
         else
         {
+          // Show cursor and grabhandle on first tap, this matches the behaviour of tapping when already editing
           mImpl->ChangeState( EventData::EDITING_WITH_GRAB_HANDLE );
         }
         relayoutNeeded = true;
@@ -2068,7 +2448,6 @@ 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" );
 
@@ -2130,8 +2509,6 @@ void Controller::SelectEvent( float x, float y, bool selectAll )
 
   if( NULL != mImpl->mEventData )
   {
-    mImpl->ChangeState( EventData::SELECTING );
-
     if( selectAll )
     {
       Event event( Event::SELECT_ALL );
@@ -2232,8 +2609,13 @@ void Controller::PasteClipboardItemEvent()
   // 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 )
@@ -2250,12 +2632,6 @@ void Controller::TextPopupButtonTouched( Dali::Toolkit::TextSelectionPopup::Butt
       mImpl->SendSelectionToClipboard( true ); // Synchronous call to modify text
       mImpl->mOperationsPending = ALL_OPERATIONS;
 
-      // This is to reset the virtual keyboard to Upper-case
-      if( 0u == mImpl->mLogicalModel->mText.Count() )
-      {
-        NotifyImfManager();
-      }
-
       if( ( 0u != mImpl->mLogicalModel->mText.Count() ) ||
           !mImpl->IsPlaceholderAvailable() )
       {
@@ -2264,8 +2640,11 @@ void Controller::TextPopupButtonTouched( Dali::Toolkit::TextSelectionPopup::Butt
       else
       {
         ShowPlaceholderText();
-        mImpl->mEventData->mUpdateCursorPosition = true;
       }
+
+      mImpl->mEventData->mUpdateCursorPosition = true;
+      mImpl->mEventData->mScrollAfterDelete = true;
+
       mImpl->RequestRelayout();
       mImpl->mControlInterface.TextChanged();
       break;
@@ -2273,7 +2652,10 @@ void Controller::TextPopupButtonTouched( Dali::Toolkit::TextSelectionPopup::Butt
     case Toolkit::TextSelectionPopup::COPY:
     {
       mImpl->SendSelectionToClipboard( false ); // Text not modified
-      mImpl->RequestRelayout(); // Handles, Selection Highlight, Popup
+
+      mImpl->mEventData->mUpdateCursorPosition = true;
+
+      mImpl->RequestRelayout(); // Cursor, Handles, Selection Highlight, Popup
       break;
     }
     case Toolkit::TextSelectionPopup::PASTE:
@@ -2315,33 +2697,36 @@ void Controller::TextPopupButtonTouched( Dali::Toolkit::TextSelectionPopup::Butt
 
 ImfManager::ImfCallbackData Controller::OnImfEvent( ImfManager& imfManager, const ImfManager::ImfEventData& imfEvent )
 {
-  bool update = false;
+  // Whether the text needs to be relaid-out.
   bool requestRelayout = false;
 
-  std::string text;
-  unsigned int cursorPosition = 0u;
+  // Whether to retrieve the text and cursor position to be sent to the IMF manager.
+  bool retrieveText = false;
+  bool retrieveCursor = false;
 
   switch( imfEvent.eventName )
   {
     case ImfManager::COMMIT:
     {
       InsertText( imfEvent.predictiveString, Text::Controller::COMMIT );
-      update = true;
       requestRelayout = true;
+      retrieveCursor = true;
       break;
     }
     case ImfManager::PREEDIT:
     {
       InsertText( imfEvent.predictiveString, Text::Controller::PRE_EDIT );
-      update = true;
       requestRelayout = true;
+      retrieveCursor = true;
       break;
     }
     case ImfManager::DELETESURROUNDING:
     {
-      update = RemoveText( imfEvent.cursorOffset, imfEvent.numberOfChars );
+      const bool textDeleted = RemoveText( imfEvent.cursorOffset,
+                                           imfEvent.numberOfChars,
+                                           DONT_UPDATE_INPUT_STYLE );
 
-      if( update )
+      if( textDeleted )
       {
         if( ( 0u != mImpl->mLogicalModel->mText.Count() ) ||
             !mImpl->IsPlaceholderAvailable() )
@@ -2351,19 +2736,18 @@ ImfManager::ImfCallbackData Controller::OnImfEvent( ImfManager& imfManager, cons
         else
         {
           ShowPlaceholderText();
-          mImpl->mEventData->mUpdateCursorPosition = true;
         }
+        mImpl->mEventData->mUpdateCursorPosition = true;
+        mImpl->mEventData->mScrollAfterDelete = true;
+
+        requestRelayout = true;
       }
-      requestRelayout = true;
       break;
     }
     case ImfManager::GETSURROUNDING:
     {
-      GetText( text );
-      cursorPosition = GetLogicalCursorPosition();
-
-      imfManager.SetSurroundingText( text );
-      imfManager.SetCursorPosition( cursorPosition );
+      retrieveText = true;
+      retrieveCursor = true;
       break;
     }
     case ImfManager::VOID:
@@ -2373,12 +2757,6 @@ ImfManager::ImfCallbackData Controller::OnImfEvent( ImfManager& imfManager, cons
     }
   } // end switch
 
-  if( ImfManager::GETSURROUNDING != imfEvent.eventName )
-  {
-    GetText( text );
-    cursorPosition = GetLogicalCursorPosition();
-  }
-
   if( requestRelayout )
   {
     mImpl->mOperationsPending = ALL_OPERATIONS;
@@ -2388,7 +2766,32 @@ ImfManager::ImfCallbackData Controller::OnImfEvent( ImfManager& imfManager, cons
     mImpl->mControlInterface.TextChanged();
   }
 
-  ImfManager::ImfCallbackData callbackData( update, cursorPosition, text, false );
+  std::string text;
+  CharacterIndex cursorPosition = 0u;
+  Length numberOfWhiteSpaces = 0u;
+
+  if( retrieveCursor )
+  {
+    numberOfWhiteSpaces = mImpl->GetNumberOfWhiteSpaces( 0u );
+
+    cursorPosition = mImpl->GetLogicalCursorPosition();
+
+    if( cursorPosition < numberOfWhiteSpaces )
+    {
+      cursorPosition = 0u;
+    }
+    else
+    {
+      cursorPosition -= numberOfWhiteSpaces;
+    }
+  }
+
+  if( retrieveText )
+  {
+    mImpl->GetText( numberOfWhiteSpaces, text );
+  }
+
+  ImfManager::ImfCallbackData callbackData( ( retrieveText || retrieveCursor ), cursorPosition, text, false );
 
   return callbackData;
 }
@@ -2419,16 +2822,13 @@ bool Controller::BackspaceKeyEvent()
   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 )
   {
-    DALI_LOG_INFO( gLogFilter, Debug::Verbose, "Controller::KeyEvent %p DALI_KEY_BACKSPACE RemovedText\n", this );
-    // Notifiy the IMF manager after text changed
-    // Automatic  Upper-case and restarting prediction on an existing word require this.
-    NotifyImfManager();
-
     if( ( 0u != mImpl->mLogicalModel->mText.Count() ) ||
         !mImpl->IsPlaceholderAvailable() )
     {
@@ -2437,30 +2837,14 @@ bool Controller::BackspaceKeyEvent()
     else
     {
       ShowPlaceholderText();
-      mImpl->mEventData->mUpdateCursorPosition = true;
     }
+    mImpl->mEventData->mUpdateCursorPosition = true;
+    mImpl->mEventData->mScrollAfterDelete = true;
   }
 
   return removed;
 }
 
-void Controller::NotifyImfManager()
-{
-  if( NULL != mImpl->mEventData )
-  {
-    if( mImpl->mEventData->mImfManager )
-    {
-      // Notifying IMF of a cursor change triggers a surrounding text request so updating it now.
-      std::string text;
-      GetText( text );
-      mImpl->mEventData->mImfManager.SetSurroundingText( text );
-
-      mImpl->mEventData->mImfManager.SetCursorPosition( GetLogicalCursorPosition() );
-      mImpl->mEventData->mImfManager.NotifyCursorPosition();
-    }
-  }
-}
-
 void Controller::ShowPlaceholderText()
 {
   if( mImpl->IsPlaceholderAvailable() )
@@ -2495,9 +2879,11 @@ 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
@@ -2509,9 +2895,12 @@ 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;
 
@@ -2526,41 +2915,30 @@ void Controller::ShowPlaceholderText()
   }
 }
 
-void Controller::ClearModelData()
-{
-  // 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->mColorRuns.Clear();
-  mImpl->mVisualModel->ClearCaches();
-}
-
 void Controller::ClearFontData()
 {
-  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();
+  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_LAYOUT_SIZE        |
+                                                           REORDER                   |
+                                                           ALIGN );
 }
 
 void Controller::ClearStyleData()