Tracking SelectionBounds for all RenderWidgets on the Browser Side (Aura Only)

content/browser/renderer_host/text_input_manager.cc

Index: content/browser/renderer_host/text_input_manager.cc
diff --git a/content/browser/renderer_host/text_input_manager.cc b/content/browser/renderer_host/text_input_manager.cc
index 258c05ee00602ff2cf4a8ed6a1f0a76b71d15b46..6b6fd05c4a99658e81401d7bb8541f474a44839f 100644
--- a/content/browser/renderer_host/text_input_manager.cc
+++ b/content/browser/renderer_host/text_input_manager.cc
@@ -5,6 +5,7 @@
 #include "content/browser/renderer_host/text_input_manager.h"
 
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
+#include "content/common/view_messages.h"
 
 namespace content {
 
@@ -51,6 +52,14 @@ RenderWidgetHostViewBase* TextInputManager::GetActiveView() const {
   return active_view_;
 }
 
+gfx::Rect TextInputManager::GetSelectionBoundsRect() {
+  if (!active_view_)
+    return gfx::Rect();
+
+  return gfx::RectBetweenSelectionBounds(selection_anchor_map_[active_view_],
+                                         selection_focus_map_[active_view_]);
+}
+
 void TextInputManager::UpdateTextInputState(
     RenderWidgetHostViewBase* view,
     const TextInputState& text_input_state) {
@@ -75,6 +84,51 @@ void TextInputManager::UpdateTextInputState(
   NotifyObserversAboutInputStateUpdate(view, changed);
 }
 
+void TextInputManager::SelectionBoundsChanged(

[EhsanK, 2016/06/27 17:18:13]

This will change when we add the same logic for Mac. (some #ifdef and a few
lines for Mac). Android does not need this code path according to the comment on
RenderWidgetHostViewAndroid::SelectionBoundsChanged (cc file).

+    RenderWidgetHostViewBase* view,
+    const ViewHostMsg_SelectionBounds_Params& params) {
+  DCHECK(IsRegistered(view));
+
+  gfx::SelectionBound anchor_bound, focus_bound;
+  anchor_bound.SetEdge(gfx::PointF(params.anchor_rect.origin()),
+                       gfx::PointF(params.anchor_rect.bottom_left()));
+  focus_bound.SetEdge(gfx::PointF(params.focus_rect.origin()),
+                      gfx::PointF(params.focus_rect.bottom_left()));
+
+  if (params.anchor_rect == params.focus_rect) {
+    anchor_bound.set_type(gfx::SelectionBound::CENTER);
+    focus_bound.set_type(gfx::SelectionBound::CENTER);
+  } else {
+    // Whether text is LTR at the anchor handle.
+    bool anchor_LTR = params.anchor_dir == blink::WebTextDirectionLeftToRight;
+    // Whether text is LTR at the focus handle.
+    bool focus_LTR = params.focus_dir == blink::WebTextDirectionLeftToRight;
+
+    if ((params.is_anchor_first && anchor_LTR) ||
+        (!params.is_anchor_first && !anchor_LTR)) {
+      anchor_bound.set_type(gfx::SelectionBound::LEFT);
+    } else {
+      anchor_bound.set_type(gfx::SelectionBound::RIGHT);
+    }
+    if ((params.is_anchor_first && focus_LTR) ||
+        (!params.is_anchor_first && !focus_LTR)) {
+      focus_bound.set_type(gfx::SelectionBound::RIGHT);
+    } else {
+      focus_bound.set_type(gfx::SelectionBound::LEFT);
+    }
+  }
+
+  if (anchor_bound == selection_anchor_map_[view] &&
+      focus_bound == selection_focus_map_[view])
+    return;
+
+  selection_anchor_map_[view] = anchor_bound;
+  selection_focus_map_[view] = focus_bound;
+
+  FOR_EACH_OBSERVER(Observer, observer_list_,
+                    OnSelectionBoundsChanged(this, view));
+}
+
 void TextInputManager::Register(RenderWidgetHostViewBase* view) {
   DCHECK(!IsRegistered(view));