Reland: Implement Aura side of unified touch text selection for contents

content/browser/renderer_host/input/touch_selection_controller.cc

 // Copyright 2014 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/input/touch_selection_controller.h"
 
 #include "base/auto_reset.h"
 #include "base/logging.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
@@ skipping 28 matching lines @@
       start_orientation_(TOUCH_HANDLE_ORIENTATION_UNDEFINED),
       end_orientation_(TOUCH_HANDLE_ORIENTATION_UNDEFINED),
       is_insertion_active_(false),
       activate_insertion_automatically_(false),
       is_selection_active_(false),
       activate_selection_automatically_(false),
       selection_empty_(false),
       selection_editable_(false),
       temporarily_hidden_(false) {
   DCHECK(client_);
-  HideAndDisallowShowingAutomatically();
+  HideAndDisallowShowingAutomatically(); // XXX: needed?
 }
 
 TouchSelectionController::~TouchSelectionController() {
 }
 
 void TouchSelectionController::OnSelectionBoundsChanged(
     const cc::ViewportSelectionBound& start,
     const cc::ViewportSelectionBound& end) {
   if (!activate_selection_automatically_ &&
       !activate_insertion_automatically_) {
@@ skipping 136 matching lines @@
 
   if (is_selection_active_) {
     bool needs_animate = start_selection_handle_->Animate(frame_time);
     needs_animate |= end_selection_handle_->Animate(frame_time);
     return needs_animate;
   }
 
   return false;
 }
 
+void TouchSelectionController::ActivateSelection(
+    const cc::ViewportSelectionBound& start,
+    const cc::ViewportSelectionBound& end) {
+  if (start.edge_bottom != end.edge_bottom) {
+    ShowSelectionHandlesAutomatically();
+    OnSelectionBoundsChanged(start, end);
+  }
+}
+
 void TouchSelectionController::OnHandleDragBegin(const TouchHandle& handle) {
   if (&handle == insertion_handle_.get()) {
     client_->OnSelectionEvent(INSERTION_DRAG_STARTED, handle.position());
     return;
   }
 
   if (&handle == start_selection_handle_.get()) {
     fixed_handle_position_ =
         end_selection_handle_->position() + GetEndLineOffset();
   } else {
@@ skipping 77 matching lines @@
     client_->OnSelectionEvent(INSERTION_MOVED, position);
 
   insertion_handle_->SetVisible(GetStartVisible(),
                                 GetAnimationStyle(was_active));
   insertion_handle_->SetPosition(position);
 }
 
 void TouchSelectionController::OnSelectionChanged() {
   DeactivateInsertion();
 
-  if (!activate_selection_automatically_)
+  if (!activate_selection_automatically_) // XXX: needed?
     return;
 
   const bool was_active = is_selection_active_;
   ActivateSelection();
 
   const TouchHandle::AnimationStyle animation = GetAnimationStyle(was_active);
   start_selection_handle_->SetVisible(GetStartVisible(), animation);
   end_selection_handle_->SetVisible(GetEndVisible(), animation);
 
   start_selection_handle_->SetPosition(GetStartPosition());
@@ skipping 94 matching lines @@
 }
 
 TouchHandle::AnimationStyle TouchSelectionController::GetAnimationStyle(
     bool was_active) const {
   return was_active && client_->SupportsAnimation()
              ? TouchHandle::ANIMATION_SMOOTH
              : TouchHandle::ANIMATION_NONE;
 }
 
 }  // namespace content