Implement touch exploration touch typing

ui/chromeos/touch_exploration_controller.h

 // 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.
 
 #ifndef UI_CHROMEOS_TOUCH_EXPLORATION_CONTROLLER_H_
 #define UI_CHROMEOS_TOUCH_EXPLORATION_CONTROLLER_H_
 
 #include "base/macros.h"
 #include "base/timer/timer.h"
 #include "base/values.h"
@@ skipping 176 matching lines @@
 
   // Make synthesized touch events are anchored at this point. This is
   // called when the object with accessibility focus is updated via something
   // other than touch exploration.
   void SetTouchAccessibilityAnchorPoint(const gfx::Point& anchor_point);
 
   // Events within the exclude bounds will not be rewritten.
   // |bounds| are in root window coordinates.
   void SetExcludeBounds(const gfx::Rect& bounds);
 
+  // Updates |lift_activation_bounds_|. See |lift_activation_bounds_| for more
+  // information.
+  void SetLiftActivationBounds(const gfx::Rect& bounds);
+
  private:
   friend class TouchExplorationControllerTestApi;
 
   // Overridden from ui::EventRewriter
   ui::EventRewriteStatus RewriteEvent(
       const ui::Event& event,
       std::unique_ptr<ui::Event>* rewritten_event) override;
   ui::EventRewriteStatus NextDispatchEvent(
       const ui::Event& last_event,
       std::unique_ptr<ui::Event>* new_event) override;
@@ skipping 82 matching lines @@
   base::Closure BindKeyEventWithFlags(const ui::KeyboardCode key, int flags);
 
   std::unique_ptr<ui::MouseEvent> CreateMouseMoveEvent(
       const gfx::PointF& location,
       int flags);
 
   void EnterTouchToMouseMode();
 
   void PlaySoundForTimer();
 
-  void SendSimulatedClick();
+  // Sends a simulated click, if an anchor point was set explicitly. Otherwise,
+  // sends a simulated tap at anchor point.
+  void SendSimulatedClickOrTap();
+
+  // Sends a simulated tap at anchor point.
+  void SendSimulatedTap();
+
+  // Sends a simulated tap, if the anchor point falls within lift activation
+  // bounds.
+  void MaybeSendSimulatedTapInLiftActivationBounds(const ui::TouchEvent& event);
 
   // Some constants used in touch_exploration_controller:
 
   // Within this many dips of the screen edge, the release event generated will
   // reset the state to NoFingersDown.
   const float kLeavingScreenEdge = 6;
 
   // Swipe/scroll gestures within these bounds (in DIPs) will change preset
   // settings.
   const float kMaxDistanceFromEdge = 75;
@@ skipping 197 matching lines @@
 
   // LocatedEvents within this area should be left alone.
   gfx::Rect exclude_bounds_;
 
   // Code that detects a touch-screen gesture to enable or disable
   // accessibility. That handler is always running, whereas this is not,
   // but events need to be sent to TouchAccessibilityEnabler before being
   // rewritten when TouchExplorationController is running.
   TouchAccessibilityEnabler* touch_accessibility_enabler_;
 
+  // Any touch exploration that both starts and ends (touch pressed, and
+  // released) within this rectangle, triggers a simulated single finger tap at
+  // the anchor point on release.
+  gfx::Rect lift_activation_bounds_;
+
   DISALLOW_COPY_AND_ASSIGN(TouchExplorationController);
 };
 
 }  // namespace ui
 
 #endif  // UI_CHROMEOS_TOUCH_EXPLORATION_CONTROLLER_H_