Add support for rect-based event targeting in views

ui/views/widget/root_view.cc

Index: ui/views/widget/root_view.cc
diff --git a/ui/views/widget/root_view.cc b/ui/views/widget/root_view.cc
index 1185c755153ad47dd10df9f4459358ea97792370..411ffd7d28f3144d2bb22a44bc28715be6c3eb49 100644
--- a/ui/views/widget/root_view.cc
+++ b/ui/views/widget/root_view.cc
@@ -278,10 +278,26 @@ void RootView::DispatchGestureEvent(ui::GestureEvent* event) {
       break;
   }
 
+  // Terry: A runtime flag will specify whether or not fuzzing should be

[tdanderson, 2013/10/07 21:35:21]

I still have to define a --use-rect-based-views-targeting flag and replace
|use_fuzzing| with a check for the existence of this flag.

Since there is no *_switches.{h,cc} files in ui/views/widget/ or any of its
parent directories, is it appropriate to create the new files
ui/views/views_switches.{h,cc} to define the new flag? Or would you prefer
another way?

+  // used here (and will possibly also specify an overlap percentage).
+  bool use_fuzzing = true;
+
+  View* gesture_handler = NULL;
+  if (use_fuzzing) {
+    // Terry: account for any possible transformations on rect?
+    gfx::Rect touch_rect(event->details().bounding_box());
+    gfx::Point origin(touch_rect.origin());
+    View::ConvertPointFromScreen(this, &origin);
+    touch_rect.set_origin(origin);
+    gesture_handler = GetEventHandlerForRect(touch_rect);
+  } else {
+    gesture_handler = GetEventHandlerForPoint(event->location());
+  }
+
   // Walk up the tree until we find a view that wants the gesture event.
-  for (gesture_handler_ = GetEventHandlerForPoint(event->location());
-      gesture_handler_ && (gesture_handler_ != this);
-      gesture_handler_ = gesture_handler_->parent()) {
+  for (gesture_handler_ = gesture_handler;
+       gesture_handler_ && (gesture_handler_ != this);
+       gesture_handler_ = gesture_handler_->parent()) {
     if (!gesture_handler_->enabled()) {
       // Disabled views eat events but are treated as not handled.
       return;