Toggle spoken feedback if two fingers are held down.

ui/chromeos/touch_exploration_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 "ui/chromeos/touch_exploration_controller.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "ui/accessibility/ax_enums.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/aura/window_tree_host.h"
+#include "ui/chromeos/touch_accessibility_enabler.h"
 #include "ui/events/event.h"
 #include "ui/events/event_processor.h"
 #include "ui/events/event_utils.h"
 #include "ui/gfx/geometry/rect.h"
 
 #define SET_STATE(state) SetState(state, __func__)
 #define VLOG_EVENT(event) \
   if (VLOG_IS_ON(1))      \
   VlogEvent(event, __func__)
 
 namespace ui {
 
 namespace {
 
 // Delay between adjustment sounds.
 const int kSoundDelayInMS = 150;
 
 void SetTouchAccessibilityFlag(ui::Event* event) {
   // This flag is used to identify mouse move events that were generated from
   // touch exploration in Chrome code.
   event->set_flags(event->flags() | ui::EF_TOUCH_ACCESSIBILITY);
 }
 
 }  // namespace
 
 TouchExplorationController::TouchExplorationController(
     aura::Window* root_window,
-    TouchExplorationControllerDelegate* delegate)
+    TouchExplorationControllerDelegate* delegate,
+    TouchAccessibilityEnabler* touch_accessibility_enabler)
     : root_window_(root_window),
       delegate_(delegate),
       state_(NO_FINGERS_DOWN),
       anchor_point_state_(ANCHOR_POINT_NONE),
       gesture_provider_(new GestureProviderAura(this, this)),
       prev_state_(NO_FINGERS_DOWN),
-      VLOG_on_(true) {
+      VLOG_on_(true),
+      touch_accessibility_enabler_(touch_accessibility_enabler) {
   DCHECK(root_window);
   root_window->GetHost()->GetEventSource()->AddEventRewriter(this);
 }
 
 TouchExplorationController::~TouchExplorationController() {
   root_window_->GetHost()->GetEventSource()->RemoveEventRewriter(this);
 }
 
 void TouchExplorationController::SetTouchAccessibilityAnchorPoint(
     const gfx::Point& anchor_point) {
@@ skipping 16 matching lines @@
       const ui::KeyEvent& key_event = static_cast<const ui::KeyEvent&>(event);
       VLOG(1) << "\nKeyboard event: " << key_event.name()
               << "\n Key code: " << key_event.key_code()
               << ", Flags: " << key_event.flags()
               << ", Is char: " << key_event.is_char();
     }
     return ui::EVENT_REWRITE_CONTINUE;
   }
   const ui::TouchEvent& touch_event = static_cast<const ui::TouchEvent&>(event);
 
+  // Let TouchAccessibilityEnabler process the unrewritten event.
+  if (touch_accessibility_enabler_)
+    touch_accessibility_enabler_->HandleTouchEvent(touch_event);
+
   if (!exclude_bounds_.IsEmpty()) {
     gfx::Point location = touch_event.location();
     root_window_->GetHost()->ConvertPointFromNativeScreen(&location);
     bool in_exclude_area = exclude_bounds_.Contains(location);
     if (in_exclude_area) {
       if (state_ == NO_FINGERS_DOWN)
         return ui::EVENT_REWRITE_CONTINUE;
       if (touch_event.type() == ui::ET_TOUCH_MOVED ||
           touch_event.type() == ui::ET_TOUCH_PRESSED) {
         return ui::EVENT_REWRITE_DISCARD;
@@ skipping 1086 matching lines @@
       return "TWO_FINGER_TAP";
   }
   return "Not a state";
 }
 
 float TouchExplorationController::GetSplitTapTouchSlop() {
   return gesture_detector_config_.touch_slop * 3;
 }
 
 }  // namespace ui