+Size Controller::Relayouter::CalculateLayoutSizeOnRequiredControllerSize(Controller& controller, const Size& requestedControllerSize, const OperationsMask& requestedOperationsMask, bool restoreLinesAndGlyphPositions)
+{
+ DALI_LOG_INFO(gLogFilter, Debug::Verbose, "-->CalculateLayoutSizeOnRequiredControllerSize\n");
+ Size calculatedLayoutSize;
+
+ Controller::Impl& impl = *controller.mImpl;
+ ModelPtr& model = impl.mModel;
+ VisualModelPtr& visualModel = model->mVisualModel;
+
+ // Store the pending operations mask so that it can be restored later on with no modifications made on it
+ // while getting the natural size were reflected on the original mask.
+ OperationsMask operationsPendingBackUp = static_cast<OperationsMask>(impl.mOperationsPending);
+
+ // This is a hotfix for side effect on Scrolling, LineWrap and Invalid position of cursor in TextEditor after calling CalculateLayoutSizeOnRequiredControllerSize.
+ // The number of lines and glyph-positions inside visualModel have been changed by calling DoRelayout with requestedControllerSize.
+ // Store the mLines and mGlyphPositions from visualModel so that they can be restored later on with no modifications made on them.
+ //TODO: Refactor "DoRelayout" and extract common code of size calculation without modifying attributes of mVisualModel, and then blah, blah, etc.
+ Vector<LineRun> linesBackup = visualModel->mLines;
+ Vector<Vector2> glyphPositionsBackup = visualModel->mGlyphPositions;
+
+ // Operations that can be done only once until the text changes.
+ const OperationsMask onlyOnceOperations = static_cast<OperationsMask>(CONVERT_TO_UTF32 |
+ GET_SCRIPTS |
+ VALIDATE_FONTS |
+ GET_LINE_BREAKS |
+ BIDI_INFO |
+ SHAPE_TEXT |
+ GET_GLYPH_METRICS);
+
+ // Set the update info to relayout the whole text.
+ TextUpdateInfo& textUpdateInfo = impl.mTextUpdateInfo;
+ textUpdateInfo.mParagraphCharacterIndex = 0u;
+ textUpdateInfo.mRequestedNumberOfCharacters = model->mLogicalModel->mText.Count();
+
+ // Make sure the model is up-to-date before layouting
+ impl.UpdateModel(onlyOnceOperations);
+
+ // Get a reference to the pending operations member
+ OperationsMask& operationsPending = impl.mOperationsPending;
+
+ // Layout the text for the new width.
+ operationsPending = static_cast<OperationsMask>(operationsPending | requestedOperationsMask);
+
+ // Store the actual control's size to restore later.
+ const Size actualControlSize = visualModel->mControlSize;
+
+ DoRelayout(controller,
+ requestedControllerSize,
+ static_cast<OperationsMask>(onlyOnceOperations |
+ requestedOperationsMask),
+ calculatedLayoutSize);
+
+ // Clear the update info. This info will be set the next time the text is updated.
+ textUpdateInfo.Clear();
+ textUpdateInfo.mClearAll = true;
+
+ // Restore the actual control's size.
+ visualModel->mControlSize = actualControlSize;
+ // Restore the previously backed-up pending operations' mask without the only once operations.
+ impl.mOperationsPending = static_cast<OperationsMask>(operationsPendingBackUp & ~onlyOnceOperations);
+
+ // Restore the previously backed-up mLines and mGlyphPositions from visualModel.
+ if(restoreLinesAndGlyphPositions)
+ {
+ visualModel->mLines = linesBackup;
+ visualModel->mGlyphPositions = glyphPositionsBackup;
+ }
+
+ return calculatedLayoutSize;
+}
+