Corner Passthrough for Accessibility

ui/chromeos/touch_exploration_controller.h

Index: ui/chromeos/touch_exploration_controller.h
diff --git a/ui/chromeos/touch_exploration_controller.h b/ui/chromeos/touch_exploration_controller.h
index 12f0bfa2fcebe0e32d1289d5343f9a0d1dfb0552..bad28737907c28ecbe9b11faaa0c97a47761ba4f 100644
--- a/ui/chromeos/touch_exploration_controller.h
+++ b/ui/chromeos/touch_exploration_controller.h
@@ -39,6 +39,11 @@ class TouchExplorationControllerDelegate {
   // Takes an int from 0.0 to 100.0 that indicates the percent the volume
   // should be set to.
   virtual void SetOutputLevel(int volume) = 0;
+
+  // This function should be called whenever the delegate should play an earcon.
+  // In the future a parameter can be passed to indicate what sound should be
+  // played.
+  virtual void PlayEarCon() = 0;
 };
 
 // TouchExplorationController is used in tandem with "Spoken Feedback" to
@@ -165,6 +170,8 @@ class UI_CHROMEOS_EXPORT TouchExplorationController
       const ui::TouchEvent& event, scoped_ptr<ui::Event>* rewritten_event);
   ui::EventRewriteStatus InTwoToOneFinger(
       const ui::TouchEvent& event, scoped_ptr<ui::Event>* rewritten_event);
+  ui::EventRewriteStatus InCornerPassthrough(
+      const ui::TouchEvent& event, scoped_ptr<ui::Event>* rewritten_event);
   ui::EventRewriteStatus InPassthrough(
       const ui::TouchEvent& event, scoped_ptr<ui::Event>* rewritten_event);
   ui::EventRewriteStatus InGestureInProgress(
@@ -285,6 +292,11 @@ class UI_CHROMEOS_EXPORT TouchExplorationController
     // happens until all fingers are up.
     TWO_TO_ONE_FINGER,
 
+    // If the user has pressed and held down the left corner past long press,
+    // then as long as they are holding the corner, all subsequent fingers
+    // registered will be in passthrough.
+    CORNER_PASSTHROUGH,
+
     // If the user is in TWO_TO_ONE_FINGER with two fingers down and presses
     // a third finger, every finger and touch event is passed through until
     // all fingers are released.
@@ -309,8 +321,11 @@ class UI_CHROMEOS_EXPORT TouchExplorationController
     TOP_EDGE = 1 << 1,
     LEFT_EDGE = 1 << 2,
     BOTTOM_EDGE = 1 << 3,
+    BOTTOM_LEFT_CORNER = LEFT_EDGE | BOTTOM_EDGE,

[aboxhall, 2014/07/24 18:26:34]

Very nice!

+    BOTTOM_RIGHT_CORNER = RIGHT_EDGE | BOTTOM_EDGE,
   };
 
+

[aboxhall, 2014/07/24 18:26:34]

nit: rogue newline

[lisayin, 2014/07/25 20:11:57]

Done.

   // Given a point, if it is within the given bounds of an edge, returns the
   // edge. If it is within the given bounds of two edges, returns an int with
   // both bits that represent the respective edges turned on. Otherwise returns
@@ -355,7 +370,8 @@ class UI_CHROMEOS_EXPORT TouchExplorationController
   // the location and id of the touch release is from here.
   scoped_ptr<ui::TouchEvent> last_two_to_one_;
 
-  // A timer to fire the mouse move event after the double-tap delay.
+  // A timer to fire to change states if a pre-set action is not completed in
+  // the allocaated time.

[aboxhall, 2014/07/24 18:26:34]

nit: allocaated (Dutch?)

[lisayin, 2014/07/25 20:11:57]

Done.

   base::OneShotTimer<TouchExplorationController> tap_timer_;

[aboxhall, 2014/07/24 18:26:34]

This may need to be renamed, based on the comment change.
action_timer_?

 
   // A timer to fire an indicating sound when sliding to change volume.
@@ -381,6 +397,10 @@ class UI_CHROMEOS_EXPORT TouchExplorationController
   // This toggles whether VLOGS are turned on or not.
   bool VLOG_on_;
 
+  // Indicates if a finger is in the lower left corner waiting for the timer to
+  // run out.
+  bool waiting_for_corner_passthrough_;
+
   DISALLOW_COPY_AND_ASSIGN(TouchExplorationController);
 };