[WIP][b:eae_mywip_paint] Paint Selection NG.

third_party/WebKit/Source/core/paint/NGTextFragmentPainter.cpp

Index: third_party/WebKit/Source/core/paint/NGTextFragmentPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/NGTextFragmentPainter.cpp b/third_party/WebKit/Source/core/paint/NGTextFragmentPainter.cpp
index 36dd5b96bcd6f705d26cb44b98aa0d624c697f39..aca4e5b8ccb530d19382285a765a897dd4073154 100644
--- a/third_party/WebKit/Source/core/paint/NGTextFragmentPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/NGTextFragmentPainter.cpp
@@ -4,6 +4,7 @@
 
 #include "core/paint/NGTextFragmentPainter.h"
 
+#include "core/editing/FrameSelection.h"
 #include "core/frame/LocalFrame.h"
 #include "core/layout/ng/inline/ng_physical_text_fragment.h"
 #include "core/paint/NGTextPainter.h"
@@ -75,6 +76,42 @@ static void PaintDecorationsExceptLineThrough(
   //}
 }
 
+static std::pair<int, int> SelectionStartEnd(

[yoichio, 2017/06/27 07:54:53]

Much comment is appreciate

+    const NGPhysicalTextFragment* text_fragment) {
+  const SelectionState& selection_state =
+      text_fragment->GetLayoutObject()->GetSelectionState();
+  if (selection_state == SelectionState::kNone)
+    return {0, 0};
+  if (selection_state == SelectionState::kInside)
+    return {0, text_fragment->Text().length()};

[yoichio, 2017/06/27 07:54:53]

Rerturn painting full;
define lewngth;

+
+  const std::pair<int, int> startend_in_ngblockflow =
+      text_fragment->GetLayoutObject()
+          ->GetFrameView()
+          ->GetFrame()
+          .Selection()
+          .LayoutSelectionStartEnd();

[yoichio, 2017/06/27 07:54:53]

Describe much more.

+  int selection_start = std::max<int>(
+      0, startend_in_ngblockflow.first - text_fragment->StartOffset());
+  int selection_end = std::min<int>(
+      text_fragment->Text().length(),
+      startend_in_ngblockflow.second - text_fragment->StartOffset());
+
+  switch (selection_state) {
+    case SelectionState::kStart:
+      return {selection_start, text_fragment->Text().length()};
+    case SelectionState::kEnd:
+      return {0, selection_end};
+    case SelectionState::kStartAndEnd:
+      return {selection_start, selection_end};
+    default:
+      NOTREACHED();
+  }
+
+  NOTREACHED();
+  return {0, 0};
+}
+
 }  // anonymous namespace
 
 void NGTextFragmentPainter::Paint(const Document& document,
@@ -159,8 +196,10 @@ void NGTextFragmentPainter::Paint(const Document& document,
   // 2. Now paint the foreground, including text and decorations.
   int selection_start = 0;
   int selection_end = 0;
-  // if (paint_selected_text_only || paint_selected_text_separately)
-  //  text_fragment_.SelectionStartEnd(selection_start, selection_end);
+  if (paint_selected_text_only || paint_selected_text_separately) {
+    std::tie(selection_start, selection_end) =
+        SelectionStartEnd(text_fragment_);
+  }
 
   // bool respect_hyphen =
   //    selection_end == static_cast<int>(text_fragment_.Len()) &&