From: Bowon Ryu <bowon.ryu@samsung.com>
Date: Fri, 12 Jul 2024 10:47:29 +0000 (+0900)
Subject: Add async text natural size
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=57330ea341d44314747b57648544f980d836e1dd;p=platform%2Fcore%2Fuifw%2Fdali-toolkit.git

Add async text natural size

RequestAsyncNaturalSize
: Requests asynchronous text natural size computation.

AsyncNaturalSizeComputedSignal
: Signal is emitted when the async natural size computed.

Change-Id: Iaf9a7b757d623e24faf025a43fa861983f6c7616
Signed-off-by: Bowon Ryu <bowon.ryu@samsung.com>
---

diff --git a/dali-toolkit/devel-api/controls/text-controls/text-label-devel.cpp b/dali-toolkit/devel-api/controls/text-controls/text-label-devel.cpp
index 6e2e741..8766f01 100644
--- a/dali-toolkit/devel-api/controls/text-controls/text-label-devel.cpp
+++ b/dali-toolkit/devel-api/controls/text-controls/text-label-devel.cpp
@@ -40,6 +40,11 @@ AsyncTextRenderedSignalType& AsyncTextRenderedSignal(TextLabel textLabel)
   return GetImpl(textLabel).AsyncTextRenderedSignal();
 }
 
+AsyncNaturalSizeComputedSignalType& AsyncNaturalSizeComputedSignal(TextLabel textLabel)
+{
+  return GetImpl(textLabel).AsyncNaturalSizeComputedSignal();
+}
+
 Vector<Vector2> GetTextSize(TextLabel textLabel, const uint32_t startIndex, const uint32_t endIndex)
 {
   return GetImpl(textLabel).GetTextSize(startIndex, endIndex);
@@ -105,6 +110,11 @@ void RequestAsyncRenderWithConstraint(TextLabel textLabel, float widthConstraint
   GetImpl(textLabel).RequestAsyncRenderWithConstraint(widthConstraint, heightConstraint);
 }
 
+void RequestAsyncNaturalSize(TextLabel textLabel)
+{
+  GetImpl(textLabel).RequestAsyncNaturalSize();
+}
+
 } // namespace DevelTextLabel
 
 } // namespace Toolkit
diff --git a/dali-toolkit/devel-api/controls/text-controls/text-label-devel.h b/dali-toolkit/devel-api/controls/text-controls/text-label-devel.h
index f3a66c1..a62255e 100644
--- a/dali-toolkit/devel-api/controls/text-controls/text-label-devel.h
+++ b/dali-toolkit/devel-api/controls/text-controls/text-label-devel.h
@@ -427,6 +427,13 @@ DALI_TOOLKIT_API void RequestAsyncRenderWithFixedWidth(TextLabel textLabel, floa
 DALI_TOOLKIT_API void RequestAsyncRenderWithConstraint(TextLabel textLabel, float widthConstraint, float heightConstraint);
 
 /**
+ * @brief Requests asynchronous text natural size computation.
+ *
+ * @param[in] textLabel The instance of TextLabel.
+ */
+DALI_TOOLKIT_API void RequestAsyncNaturalSize(TextLabel textLabel);
+
+/**
  * @brief Anchor clicked signal type.
  *
  * @note Signal
@@ -450,6 +457,15 @@ using TextFitChangedSignalType = Signal<void(TextLabel)>;
 using AsyncTextRenderedSignalType = Signal<void(TextLabel, float, float)>;
 
 /**
+ * @brief Async natural size computed signal type.
+ *
+ * @note Signal
+ *  - float : computed width.
+ *  - float : computed height.
+ */
+using AsyncNaturalSizeComputedSignalType = Signal<void(TextLabel, float, float)>;
+
+/**
  * @brief This signal is emitted when the anchor is clicked.
  *
  * A callback of the following type may be connected:
@@ -485,6 +501,18 @@ DALI_TOOLKIT_API TextFitChangedSignalType& TextFitChangedSignal(TextLabel textLa
  */
 DALI_TOOLKIT_API AsyncTextRenderedSignalType& AsyncTextRenderedSignal(TextLabel textLabel);
 
+/**
+ * @brief This signal is emitted when the async natural size computed.
+ *
+ * A callback of the following type may be connected:
+ * @code
+ *   void YourCallbackName(TextLabel textLabel);
+ * @endcode
+ * @param[in] textLabel The instance of TextLabel.
+ * @return The signal to connect to.
+ */
+DALI_TOOLKIT_API AsyncNaturalSizeComputedSignalType& AsyncNaturalSizeComputedSignal(TextLabel textLabel);
+
 } // namespace DevelTextLabel
 
 } // namespace Toolkit
diff --git a/dali-toolkit/internal/controls/text-controls/text-label-impl.cpp b/dali-toolkit/internal/controls/text-controls/text-label-impl.cpp
index b04f808..386bdc4 100644
--- a/dali-toolkit/internal/controls/text-controls/text-label-impl.cpp
+++ b/dali-toolkit/internal/controls/text-controls/text-label-impl.cpp
@@ -160,6 +160,7 @@ DALI_ANIMATABLE_PROPERTY_COMPONENT_REGISTRATION(Toolkit,    TextLabel, "textColo
 DALI_SIGNAL_REGISTRATION(Toolkit, TextLabel, "anchorClicked", SIGNAL_ANCHOR_CLICKED)
 DALI_SIGNAL_REGISTRATION(Toolkit, TextLabel, "textFitChanged", SIGNAL_TEXT_FIT_CHANGED)
 DALI_SIGNAL_REGISTRATION(Toolkit, TextLabel, "asyncTextRendered", SIGNAL_ASYNC_TEXT_RENDERED)
+DALI_SIGNAL_REGISTRATION(Toolkit, TextLabel, "asyncNaturalSizeComputed", SIGNAL_ASYNC_NATURAL_SIZE_COMPUTED)
 
 DALI_TYPE_REGISTRATION_END()
 // clang-format on
@@ -1000,6 +1001,14 @@ bool TextLabel::DoConnectSignal(BaseObject* object, ConnectionTrackerInterface*
       labelImpl.AsyncTextRenderedSignal().Connect(tracker, functor);
     }
   }
+  else if(0 == strcmp(signalName.c_str(), SIGNAL_ASYNC_NATURAL_SIZE_COMPUTED))
+  {
+    if(label)
+    {
+      Internal::TextLabel& labelImpl(GetImpl(label));
+      labelImpl.AsyncNaturalSizeComputedSignal().Connect(tracker, functor);
+    }
+  }
   else
   {
     // signalName does not match any signal
@@ -1024,6 +1033,11 @@ DevelTextLabel::AsyncTextRenderedSignalType& TextLabel::AsyncTextRenderedSignal(
   return mAsyncTextRenderedSignal;
 }
 
+DevelTextLabel::AsyncNaturalSizeComputedSignalType& TextLabel::AsyncNaturalSizeComputedSignal()
+{
+  return mAsyncNaturalSizeComputedSignal;
+}
+
 void TextLabel::OnInitialize()
 {
   Actor self = Self();
@@ -1617,6 +1631,37 @@ void TextLabel::AsyncTextFitChanged(float pointSize)
   }
 }
 
+void TextLabel::AsyncSizeComputed(Text::AsyncTextRenderInfo renderInfo)
+{
+  switch (renderInfo.requestType)
+  {
+    case Async::COMPUTE_NATURAL_SIZE:
+    {
+      DALI_LOG_RELEASE_INFO("Natural size : %f, %f\n", renderInfo.renderedSize.width, renderInfo.renderedSize.height);
+      EmitAsyncNaturalSizeComputedSignal(renderInfo.renderedSize.width, renderInfo.renderedSize.height);
+    }
+    break;
+  
+    case Async::COMPUTE_HEIGHT_FOR_WIDTH:
+    {
+      // TODO
+    }
+    break;
+
+    case Async::COMPUTE_LINE_COUNT:
+    {
+      // TODO
+    }
+    break;
+
+    default:
+    {
+      DALI_LOG_ERROR("Unexpected request type recieved : %d\n", renderInfo.requestType);
+    }
+    break;
+  }
+}
+
 void TextLabel::AsyncLoadComplete(Text::AsyncTextRenderInfo renderInfo)
 {
   // Pure Virtual from AsyncTextInterface
@@ -1672,6 +1717,14 @@ void TextLabel::EmitAsyncTextRenderedSignal(float width, float height)
   mAsyncTextRenderedSignal.Emit(handle, width, height);
 }
 
+void TextLabel::EmitAsyncNaturalSizeComputedSignal(float width, float height)
+{
+  Dali::Toolkit::TextLabel handle(GetOwner());
+  Extents padding;
+  padding = Self().GetProperty<Extents>(Toolkit::Control::Property::PADDING);
+  mAsyncNaturalSizeComputedSignal.Emit(handle, width + (padding.start + padding.end), height + (padding.top + padding.bottom));
+}
+
 void TextLabel::OnAccessibilityStatusChanged()
 {
   CommonTextUtils::SynchronizeTextAnchorsInParent(Self(), mController, mAnchorActors);
@@ -1783,6 +1836,19 @@ void TextLabel::EnableControlBackground(const bool enable)
   }
 }
 
+void TextLabel::RequestAsyncNaturalSize()
+{
+  Actor self = Self();
+  Extents padding(0u, 0u, 0u, 0u);
+  Vector2 contentSize(0.0f, 0.0f);
+  Dali::LayoutDirection::Type layoutDirection = mController->GetLayoutDirection(self);
+
+  AsyncTextParameters parameters = GetAsyncTextParameters(contentSize, padding, layoutDirection);
+  parameters.requestType = Async::COMPUTE_NATURAL_SIZE;
+
+  TextVisual::RequestAsyncSizeComputation(mVisual, parameters);
+}
+
 void TextLabel::RequestAsyncRenderWithFixedSize(float width, float height)
 {
   DALI_LOG_RELEASE_INFO("Request size : %f, %f\n", width, height);
@@ -1812,7 +1878,7 @@ void TextLabel::RequestAsyncRenderWithFixedSize(float width, float height)
   }
 
   AsyncTextParameters parameters = GetAsyncTextParameters(contentSize, padding, layoutDirection);
-  parameters.renderType = AsyncTextParameters::FIXED_SIZE;
+  parameters.requestType = Async::RENDER_FIXED_SIZE;
   parameters.manualRender = true;
 
   TextVisual::UpdateAsyncRenderer(mVisual, parameters);
@@ -1849,7 +1915,7 @@ void TextLabel::RequestAsyncRenderWithFixedWidth(float width, float heightConstr
   }
 
   AsyncTextParameters parameters = GetAsyncTextParameters(contentSize, padding, layoutDirection);
-  parameters.renderType = AsyncTextParameters::FIXED_WIDTH;
+  parameters.requestType = Async::RENDER_FIXED_WIDTH;
   parameters.manualRender = true;
 
   TextVisual::UpdateAsyncRenderer(mVisual, parameters);
@@ -1886,7 +1952,7 @@ void TextLabel::RequestAsyncRenderWithConstraint(float widthConstraint, float he
   }
 
   AsyncTextParameters parameters = GetAsyncTextParameters(contentSize, padding, layoutDirection);
-  parameters.renderType = AsyncTextParameters::CONSTRAINT;
+  parameters.requestType = Async::RENDER_CONSTRAINT;
   parameters.manualRender = true;
 
   TextVisual::UpdateAsyncRenderer(mVisual, parameters);
diff --git a/dali-toolkit/internal/controls/text-controls/text-label-impl.h b/dali-toolkit/internal/controls/text-controls/text-label-impl.h
index f3640c2..3cd8c6e 100644
--- a/dali-toolkit/internal/controls/text-controls/text-label-impl.h
+++ b/dali-toolkit/internal/controls/text-controls/text-label-impl.h
@@ -92,6 +92,11 @@ public:
   DevelTextLabel::AsyncTextRenderedSignalType& AsyncTextRenderedSignal();
 
   /**
+   * @copydoc Dali::Toollkit::TextLabel::AsyncNaturalSizeComputedSignal()
+   */
+  DevelTextLabel::AsyncNaturalSizeComputedSignalType& AsyncNaturalSizeComputedSignal();
+
+  /**
    * Connects a callback function with the object's signals.
    * @param[in] object The object providing the signal.
    * @param[in] tracker Used to disconnect the signal.
@@ -271,6 +276,11 @@ public:
    */
   void RequestAsyncRenderWithConstraint(float widthConstraint, float heightConstraint);
 
+  /**
+   * @brief Requests asynchronous text natural size computation.
+   */
+  void RequestAsyncNaturalSize();
+
 
 private: // From Control
   /**
@@ -359,6 +369,12 @@ private: // from AsyncTextInterface
    */
   void AsyncLoadComplete(Text::AsyncTextRenderInfo renderInfo);
 
+  /**
+   * @copydoc Text::AsyncTextInterface::AsyncSizeComputed()
+   */
+  void AsyncSizeComputed(Text::AsyncTextRenderInfo renderInfo);
+
+
 private: // Implementation
   /**
    * Construct a new TextLabel.
@@ -429,6 +445,11 @@ private:
    */
   void EmitAsyncTextRenderedSignal(float width, float height);
 
+  /**
+   * @brief Emits AsyncNaturalSizeComputed signal.
+   */
+  void EmitAsyncNaturalSizeComputedSignal(float width, float height);
+
   void OnAccessibilityStatusChanged();
 
 private: // Data
@@ -443,6 +464,7 @@ private: // Data
   Toolkit::DevelTextLabel::AnchorClickedSignalType  mAnchorClickedSignal;
   Toolkit::DevelTextLabel::TextFitChangedSignalType mTextFitChangedSignal;
   Toolkit::DevelTextLabel::AsyncTextRenderedSignalType mAsyncTextRenderedSignal;
+  Toolkit::DevelTextLabel::AsyncNaturalSizeComputedSignalType mAsyncNaturalSizeComputedSignal;
 
   std::string mLocale;
   Vector2     mSize;
diff --git a/dali-toolkit/internal/text/async-text/async-text-interface.h b/dali-toolkit/internal/text/async-text/async-text-interface.h
index 0deaf8d..0bf1aa4 100644
--- a/dali-toolkit/internal/text/async-text/async-text-interface.h
+++ b/dali-toolkit/internal/text/async-text/async-text-interface.h
@@ -58,6 +58,11 @@ public:
    * @brief Called when the async load complete.
    */
   virtual void AsyncLoadComplete(Text::AsyncTextRenderInfo renderInfo) = 0;
+
+  /**
+   * @brief Called when the async size computed.
+   */
+  virtual void AsyncSizeComputed(Text::AsyncTextRenderInfo renderInfo) = 0;
 };
 
 } // namespace Text
diff --git a/dali-toolkit/internal/text/async-text/async-text-loader-impl.cpp b/dali-toolkit/internal/text/async-text/async-text-loader-impl.cpp
index 623b26e..22e9c23 100644
--- a/dali-toolkit/internal/text/async-text/async-text-loader-impl.cpp
+++ b/dali-toolkit/internal/text/async-text/async-text-loader-impl.cpp
@@ -1071,7 +1071,7 @@ AsyncTextRenderInfo AsyncTextLoader::RenderText(AsyncTextParameters& parameters)
 {
   DALI_LOG_RELEASE_INFO("-->AsyncTextLoader::RenderText\n");
 
-  if(parameters.renderType == AsyncTextParameters::CONSTRAINT)
+  if(parameters.requestType == Async::RENDER_CONSTRAINT)
   {
     Size textNaturalSize = ComputeNaturalSize(parameters);
     // textWidth is widthConstraint
@@ -1081,12 +1081,12 @@ AsyncTextRenderInfo AsyncTextLoader::RenderText(AsyncTextParameters& parameters)
     }
   }
 
-  if(parameters.renderType == AsyncTextParameters::FIXED_WIDTH || parameters.renderType == AsyncTextParameters::CONSTRAINT)
+  if(parameters.requestType == Async::RENDER_FIXED_WIDTH || parameters.requestType == Async::RENDER_CONSTRAINT)
   {
     // In case of CONSTRAINT, the natural size has already been calculated.
     // So we can skip Initialize and Update at this stage.
     // Only the layout is newly calculated to obtain the height.
-    bool layoutOnly = (parameters.renderType == AsyncTextParameters::CONSTRAINT);  
+    bool layoutOnly = (parameters.requestType == Async::RENDER_CONSTRAINT);  
     float height = ComputeHeightForWidth(parameters, parameters.textWidth, layoutOnly);
 
     // textHeight is heightConstraint.
@@ -1166,6 +1166,16 @@ Size AsyncTextLoader::ComputeNaturalSize(AsyncTextParameters& parameters)
   return naturalSize;
 }
 
+AsyncTextRenderInfo AsyncTextLoader::GetNaturalSize(AsyncTextParameters& parameters)
+{
+  Size textNaturalSize = ComputeNaturalSize(parameters);
+  AsyncTextRenderInfo renderInfo;
+  renderInfo.renderedSize = textNaturalSize;
+  renderInfo.requestType  = Async::COMPUTE_NATURAL_SIZE;
+
+  return renderInfo;
+}
+
 AsyncTextRenderInfo AsyncTextLoader::RenderAutoScroll(AsyncTextParameters& parameters)
 {
   DALI_LOG_RELEASE_INFO("-->AsyncTextLoader::RenderAutoScroll\n");
@@ -1177,7 +1187,7 @@ AsyncTextRenderInfo AsyncTextLoader::RenderAutoScroll(AsyncTextParameters& param
   textNaturalSize.width += (parameters.padding.start + parameters.padding.end);
   textNaturalSize.height += (parameters.padding.top + parameters.padding.bottom);
 
-  if(parameters.renderType == AsyncTextParameters::FIXED_WIDTH || parameters.renderType == AsyncTextParameters::CONSTRAINT)
+  if(parameters.requestType == Async::RENDER_FIXED_WIDTH || parameters.requestType == Async::RENDER_CONSTRAINT)
   {
     // The real height calculated during layout should be set.
     parameters.textHeight = textNaturalSize.height - (parameters.padding.top + parameters.padding.bottom);
@@ -1254,7 +1264,7 @@ bool AsyncTextLoader::CheckForTextFit(AsyncTextParameters& parameters, float poi
 
 AsyncTextRenderInfo AsyncTextLoader::RenderTextFit(AsyncTextParameters& parameters)
 {
-  if(parameters.renderType == AsyncTextParameters::CONSTRAINT)
+  if(parameters.requestType == Async::RENDER_CONSTRAINT)
   {
     Size textNaturalSize = ComputeNaturalSize(parameters);
     // textWidth is widthConstraint
@@ -1264,12 +1274,12 @@ AsyncTextRenderInfo AsyncTextLoader::RenderTextFit(AsyncTextParameters& paramete
     }
   }
 
-  if(parameters.renderType == AsyncTextParameters::FIXED_WIDTH || parameters.renderType == AsyncTextParameters::CONSTRAINT)
+  if(parameters.requestType == Async::RENDER_FIXED_WIDTH || parameters.requestType == Async::RENDER_CONSTRAINT)
   {
     // In case of CONSTRAINT, the natural size has already been calculated.
     // So we can skip Initialize and Update at this stage.
     // Only the layout is newly calculated to obtain the height.
-    bool layoutOnly = (parameters.renderType == AsyncTextParameters::CONSTRAINT);  
+    bool layoutOnly = (parameters.requestType == Async::RENDER_CONSTRAINT);  
     float height = ComputeHeightForWidth(parameters, parameters.textWidth, layoutOnly);
 
     // textHeight is heightConstraint
diff --git a/dali-toolkit/internal/text/async-text/async-text-loader-impl.h b/dali-toolkit/internal/text/async-text/async-text-loader-impl.h
index 432a695..f1cefb5 100644
--- a/dali-toolkit/internal/text/async-text/async-text-loader-impl.h
+++ b/dali-toolkit/internal/text/async-text/async-text-loader-impl.h
@@ -89,6 +89,11 @@ public:
    */
   AsyncTextRenderInfo RenderAutoScroll(AsyncTextParameters& parameters);
 
+  /**
+   * @copydoc Dali::AsyncTextLoader::GetNaturalSize()
+   */
+  AsyncTextRenderInfo GetNaturalSize(AsyncTextParameters& parameters);
+
 private:
   // Worker thread
   /**
diff --git a/dali-toolkit/internal/text/async-text/async-text-loader.cpp b/dali-toolkit/internal/text/async-text/async-text-loader.cpp
index 2f8db7f..4143af7 100644
--- a/dali-toolkit/internal/text/async-text/async-text-loader.cpp
+++ b/dali-toolkit/internal/text/async-text/async-text-loader.cpp
@@ -77,6 +77,11 @@ AsyncTextRenderInfo AsyncTextLoader::RenderAutoScroll(AsyncTextParameters& param
   return GetImplementation(*this).RenderAutoScroll(parameters);
 }
 
+AsyncTextRenderInfo AsyncTextLoader::GetNaturalSize(AsyncTextParameters& parameters)
+{
+  return GetImplementation(*this).GetNaturalSize(parameters);
+}
+
 Text::AsyncTextModule& AsyncTextLoader::GetModule()
 {
   return GetImplementation(*this).GetModule();
diff --git a/dali-toolkit/internal/text/async-text/async-text-loader.h b/dali-toolkit/internal/text/async-text/async-text-loader.h
index dd71c00..c370b98 100644
--- a/dali-toolkit/internal/text/async-text/async-text-loader.h
+++ b/dali-toolkit/internal/text/async-text/async-text-loader.h
@@ -43,17 +43,23 @@ class AsyncTextLoader;
 
 } // namespace DALI_INTERNAL
 
-struct AsyncTextParameters
+namespace Async
 {
-  enum RenderType
+  enum RequestType
   {
-    FIXED_SIZE,
-    FIXED_WIDTH,
-    CONSTRAINT
+    RENDER_FIXED_SIZE,
+    RENDER_FIXED_WIDTH,
+    RENDER_CONSTRAINT,
+    COMPUTE_NATURAL_SIZE,
+    COMPUTE_HEIGHT_FOR_WIDTH,
+    COMPUTE_LINE_COUNT
   };
+} // namespace Async
 
+struct AsyncTextParameters
+{
   AsyncTextParameters()
-  : renderType{FIXED_SIZE},
+  : requestType{Async::RENDER_FIXED_SIZE},
     manualRender{false},
     maxTextureSize{0},
     text{},
@@ -122,8 +128,8 @@ struct AsyncTextParameters
   {
   }
 
-  RenderType renderType;
-  bool manualRender : 1;
+  Async::RequestType requestType;
+  bool               manualRender : 1;
 
   int maxTextureSize;     ///< The maximum size of texture.
 
@@ -221,7 +227,8 @@ struct AsyncTextRenderInfo
     isOverlayStyle(false),
     isTextDirectionRTL(false),
     isCutout(false),
-    manualRendered(false)
+    manualRendered(false),
+    requestType(Async::RENDER_FIXED_SIZE)
   {
   }
 
@@ -246,6 +253,7 @@ struct AsyncTextRenderInfo
   bool          isTextDirectionRTL;
   bool          isCutout;
   bool          manualRendered;
+  Async::RequestType requestType;
 };
 
 /**
@@ -329,6 +337,15 @@ public:
    * @return An AsyncTextRenderInfo.
    */
   AsyncTextRenderInfo RenderAutoScroll(AsyncTextParameters& parameters);
+  
+  /**
+   * @brief Gets the natural size of text.
+   *
+   * @param[in] parameters All options required to compute text.
+   *
+   * @return An AsyncTextRenderInfo.
+   */
+  AsyncTextRenderInfo GetNaturalSize(AsyncTextParameters& parameters);
 
   /**
    * @brief Get AsyncTextModule to used in text visual.
diff --git a/dali-toolkit/internal/text/async-text/text-loading-task.cpp b/dali-toolkit/internal/text/async-text/text-loading-task.cpp
index 937baed..5e20227 100644
--- a/dali-toolkit/internal/text/async-text/text-loading-task.cpp
+++ b/dali-toolkit/internal/text/async-text/text-loading-task.cpp
@@ -24,8 +24,6 @@
 #include <dali/integration-api/debug.h>
 #include <dali/integration-api/trace.h>
 
-// FOR TEST
-#include <thread>
 
 namespace Dali
 {
@@ -91,20 +89,54 @@ bool TextLoadingTask::IsReady()
 
 void TextLoadingTask::Load()
 {
-  if(mParameters.isAutoScrollEnabled && !mParameters.isMultiLine)
+  switch (mParameters.requestType)
   {
-    DALI_LOG_RELEASE_INFO("-->TextLoadingTask::Load RenderAutoScroll\n");
-    mRenderInfo = mLoader.RenderAutoScroll(mParameters);
-  }
-  else if(mParameters.isTextFitEnabled || mParameters.isTextFitArrayEnabled)
-  {
-    DALI_LOG_RELEASE_INFO("-->TextLoadingTask::Load RenderTextFit\n");
-    mRenderInfo = mLoader.RenderTextFit(mParameters);
-  }
-  else
-  {
-    DALI_LOG_RELEASE_INFO("-->TextLoadingTask::Load RenderText\n");
-    mRenderInfo = mLoader.RenderText(mParameters);
+    case Text::Async::RENDER_FIXED_SIZE:
+    case Text::Async::RENDER_FIXED_WIDTH:
+    case Text::Async::RENDER_CONSTRAINT:
+    {
+      if(mParameters.isAutoScrollEnabled && !mParameters.isMultiLine)
+      {
+        DALI_LOG_RELEASE_INFO("-->TextLoadingTask::Load RenderAutoScroll\n");
+        mRenderInfo = mLoader.RenderAutoScroll(mParameters);
+      }
+      else if(mParameters.isTextFitEnabled || mParameters.isTextFitArrayEnabled)
+      {
+        DALI_LOG_RELEASE_INFO("-->TextLoadingTask::Load RenderTextFit\n");
+        mRenderInfo = mLoader.RenderTextFit(mParameters);
+      }
+      else
+      {
+        DALI_LOG_RELEASE_INFO("-->TextLoadingTask::Load RenderText\n");
+        mRenderInfo = mLoader.RenderText(mParameters);
+      }
+    }
+    break;
+
+    case Text::Async::COMPUTE_NATURAL_SIZE:
+    {
+      DALI_LOG_RELEASE_INFO("-->TextLoadingTask::Load GetNaturalSize\n");
+      mRenderInfo = mLoader.GetNaturalSize(mParameters);
+    }
+    break;
+  
+    case Text::Async::COMPUTE_HEIGHT_FOR_WIDTH:
+    {
+      // TODO
+    }
+    break;
+
+    case Text::Async::COMPUTE_LINE_COUNT:
+    {
+      // TODO
+    }
+    break;
+
+    default:
+    {
+      DALI_LOG_ERROR("Unexpected request type recieved : %d\n", mParameters.requestType);
+    }
+    break;
   }
 }
 
diff --git a/dali-toolkit/internal/visuals/text/text-visual.cpp b/dali-toolkit/internal/visuals/text/text-visual.cpp
index 52d5c8a..c4c3c77 100644
--- a/dali-toolkit/internal/visuals/text/text-visual.cpp
+++ b/dali-toolkit/internal/visuals/text/text-visual.cpp
@@ -729,6 +729,17 @@ void TextVisual::LoadComplete(bool loadingSuccess, TextInformation textInformati
     Text::AsyncTextRenderInfo renderInfo = textInformation.renderInfo;
     Text::AsyncTextParameters parameters = textInformation.parameters;
 
+    if(parameters.requestType == Text::Async::COMPUTE_NATURAL_SIZE ||
+       parameters.requestType == Text::Async::COMPUTE_HEIGHT_FOR_WIDTH ||
+       parameters.requestType == Text::Async::COMPUTE_LINE_COUNT)
+    {
+      if(mAsyncTextInterface)
+      {
+        mAsyncTextInterface->AsyncSizeComputed(renderInfo);
+        return;
+      }
+    }
+
     // Calculate the size of the visual that can fit the text.
     // The size of the text after it has been laid-out, size of pixel data buffer.
     Size layoutSize(static_cast<float>(renderInfo.width), static_cast<float>(renderInfo.height));
@@ -968,6 +979,20 @@ void TextVisual::SetAsyncTextInterface(Text::AsyncTextInterface* asyncTextInterf
   mAsyncTextInterface = asyncTextInterface;
 }
 
+void TextVisual::RequestAsyncSizeComputation(Text::AsyncTextParameters& parameters)
+{
+  Actor control = mControl.GetHandle();
+  if(!control)
+  {
+    // Nothing to do.
+    return;
+  }
+
+  TextLoadObserver* textLoadObserver = this;
+  Text::AsyncTextManager::Get().RequestLoad(parameters, textLoadObserver);
+  DALI_LOG_RELEASE_INFO("-->TextVisual::RequestAsyncSizeComputation RequestLoad\n");
+}
+
 void TextVisual::UpdateAsyncRenderer(Text::AsyncTextParameters& parameters)
 {
   Actor control = mControl.GetHandle();
@@ -978,7 +1003,7 @@ void TextVisual::UpdateAsyncRenderer(Text::AsyncTextParameters& parameters)
     return;
   }
 
-  if(parameters.renderType == Text::AsyncTextParameters::FIXED_SIZE &&
+  if(parameters.requestType == Text::Async::RENDER_FIXED_SIZE &&
     ((fabsf(parameters.textWidth) < Math::MACHINE_EPSILON_1000) || (fabsf(parameters.textHeight) < Math::MACHINE_EPSILON_1000) || parameters.text.empty()))
   {
     // Remove the texture set and any renderer previously set.
diff --git a/dali-toolkit/internal/visuals/text/text-visual.h b/dali-toolkit/internal/visuals/text/text-visual.h
index 7fba6de..55f46e3 100644
--- a/dali-toolkit/internal/visuals/text/text-visual.h
+++ b/dali-toolkit/internal/visuals/text/text-visual.h
@@ -147,6 +147,16 @@ public:
   };
 
   /**
+   * @brief Instantly requests the async size computation.
+   * @param[in] visual The text visual.
+   * @param[in] parameters The async text parameters.
+   */
+  static void RequestAsyncSizeComputation(Toolkit::Visual::Base visual, Text::AsyncTextParameters& parameters)
+  {
+    GetVisualObject(visual).RequestAsyncSizeComputation(parameters);
+  };
+
+  /**
    * @brief Set the control's async text interface.
    * @param[in] visual The text visual.
    * @param[in] asyncTextInterface The async text interface.
@@ -273,6 +283,12 @@ private:
   void UpdateAsyncRenderer(Text::AsyncTextParameters& parameters);
 
   /**
+   * @brief Requests the async size computation.
+   * @param[in] parameters The async text parameters.
+   */
+  void RequestAsyncSizeComputation(Text::AsyncTextParameters& parameters);
+
+  /**
    * @brief Set the control's async text interface.
    * @param[in] asyncTextInterface The async text interface.
    */