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

content/browser/renderer_host/text_input_manager.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #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 {
 
 namespace {
 
 bool AreDifferentTextInputStates(const content::TextInputState& old_state,
                                  const content::TextInputState& new_state) {
 #if defined(USE_AURA)
   return old_state.type != new_state.type || old_state.mode != new_state.mode ||
          old_state.flags != new_state.flags ||
@@ skipping 26 matching lines @@
 }
 
 const TextInputState* TextInputManager::GetTextInputState() {
   return !!active_view_ ? &text_input_state_map_[active_view_] : nullptr;
 }
 
 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) {
   DCHECK(IsRegistered(view));
 
   // Since |view| is registgered, we already have a previous value for its
   // TextInputState.
   bool changed = AreDifferentTextInputStates(text_input_state_map_[view],
                                              text_input_state);
 
   text_input_state_map_[view] = text_input_state;
 
   // |active_view_| is only updated when the state for |view| is not none.
   if (text_input_state.type != ui::TEXT_INPUT_TYPE_NONE)
     active_view_ = view;
 
   // If the state for |active_view_| is none, then we no longer have an
   // |active_view_|.
   if (active_view_ == view && text_input_state.type == ui::TEXT_INPUT_TYPE_NONE)
     active_view_ = nullptr;
 
   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));
 
   text_input_state_map_[view] = TextInputState();
 }
 
 void TextInputManager::Unregister(RenderWidgetHostViewBase* view) {
   DCHECK(IsRegistered(view));
 
   text_input_state_map_.erase(view);
@@ skipping 18 matching lines @@
 
 void TextInputManager::NotifyObserversAboutInputStateUpdate(
     RenderWidgetHostViewBase* updated_view,
     bool did_update_state) {
   FOR_EACH_OBSERVER(
       Observer, observer_list_,
       OnUpdateTextInputStateCalled(this, updated_view, did_update_state));
 }
 
 }  // namespace content