Handle Emoji clustering for cursor handling

[platform/core/uifw/dali-toolkit.git] / dali-toolkit / internal / text / cursor-helper-functions.cpp

diff --git a/dali-toolkit/internal/text/cursor-helper-functions.cpp b/dali-toolkit/internal/text/cursor-helper-functions.cpp
index c70d530..d895418 100644 (file)
--- a/dali-toolkit/internal/text/cursor-helper-functions.cpp
+++ b/dali-toolkit/internal/text/cursor-helper-functions.cpp
@@ -22,6 +22,8 @@
 #include <dali/integration-api/debug.h>
 
 // INTERNAL INCLUDES
+#include <dali-toolkit/internal/text/characters-helper-functions.h>
+#include <dali-toolkit/internal/text/emoji-helper.h>
 #include <dali-toolkit/internal/text/glyph-metrics-helper.h>
 
 namespace
@@ -153,9 +155,10 @@ LineIndex GetClosestLine(VisualModelPtr visualModel,
       it != endIt;
       ++it, ++lineIndex)
   {
-    const LineRun& lineRun = *it;
+    const LineRun& lineRun    = *it;
+    bool           isLastLine = (it + 1 == endIt);
 
-    totalHeight += GetLineHeight(lineRun);
+    totalHeight += GetLineHeight(lineRun, isLastLine);
 
     if(visualY < totalHeight)
     {
@@ -182,9 +185,10 @@ float CalculateLineOffset(const Vector<LineRun>& lines,
       it != endIt;
       ++it)
   {
-    const LineRun& lineRun = *it;
+    const LineRun& lineRun    = *it;
+    bool           isLastLine = (it + 1 == lines.End());
 
-    offset += GetLineHeight(lineRun);
+    offset += GetLineHeight(lineRun, isLastLine);
   }
 
   return offset;
@@ -456,6 +460,19 @@ CharacterIndex GetClosestCursorIndex(VisualModelPtr         visualModel,
 
   logicalIndex = (bidiLineFetched ? logicalModel->GetLogicalCursorIndex(visualIndex) : visualIndex);
 
+  // Handle Emoji clustering for cursor handling:
+  // Fixing this case:
+  // - When there is Emoji contains multi unicodes and it is layoutted at the end of line (LineWrap case , is not new line case)
+  // - Try to click at the center or at the end of Emoji then the cursor appears inside Emoji
+  // - Example:"FamilyManWomanGirlBoy &#x1F468;&#x200D;&#x1F469;&#x200D;&#x1F467;&#x200D;&#x1F466;"
+  const Script script = logicalModel->GetScript(logicalIndex);
+  if(IsOneOfEmojiScripts(script))
+  {
+    //TODO: Use this clustering for Emoji cases only. This needs more testing to generalize to all scripts.
+    CharacterRun emojiClusteredCharacters = RetrieveClusteredCharactersOfCharacterIndex(visualModel, logicalModel, logicalIndex);
+    logicalIndex                          = emojiClusteredCharacters.characterIndex;
+  }
+
   DALI_LOG_INFO(gLogFilter, Debug::Verbose, "closest visualIndex %d logicalIndex %d\n", visualIndex, logicalIndex);
 
   DALI_ASSERT_DEBUG((logicalIndex <= logicalModel->mText.Count() && logicalIndex >= 0) && "GetClosestCursorIndex - Out of bounds index");
@@ -504,7 +521,9 @@ void GetCursorPosition(GetCursorPositionParameters& parameters,
     cursorInfo.lineOffset = CalculateLineOffset(parameters.visualModel->mLines,
                                                 newLineIndex);
 
-    cursorInfo.lineHeight = GetLineHeight(newLine);
+    // The line height is the addition of the line ascender and the line descender.
+    // However, the line descender has a negative value, hence the subtraction also line spacing should not be included in cursor height.
+    cursorInfo.lineHeight = newLine.ascender - newLine.descender;
 
     index                                = 0u;
     const Length totalNumberOfCharacters = parameters.logicalModel->mText.Count();
@@ -560,7 +579,9 @@ void GetCursorPosition(GetCursorPositionParameters& parameters,
     cursorInfo.lineOffset = CalculateLineOffset(parameters.visualModel->mLines,
                                                 lineIndex);
 
-    cursorInfo.lineHeight = GetLineHeight(line);
+    // The line height is the addition of the line ascender and the line descender.
+    // However, the line descender has a negative value, hence the subtraction also line spacing should not be included in cursor height.
+    cursorInfo.lineHeight = line.ascender - line.descender;
 
     // Calculate the primary cursor.