Add support for rect-based event targeting in views

chrome/browser/ui/views/tabs/tab_strip.cc

Index: chrome/browser/ui/views/tabs/tab_strip.cc
diff --git a/chrome/browser/ui/views/tabs/tab_strip.cc b/chrome/browser/ui/views/tabs/tab_strip.cc
index 6841fd93fa618f6d749327c9241325a1900fb213..28c9cc2f1a603ffcd6e9b4c063f7f6f490128fbd 100644
--- a/chrome/browser/ui/views/tabs/tab_strip.cc
+++ b/chrome/browser/ui/views/tabs/tab_strip.cc
@@ -254,16 +254,16 @@ class ResetDraggingStateDelegate
   DISALLOW_COPY_AND_ASSIGN(ResetDraggingStateDelegate);
 };
 
-// If |dest| contains the point |point_in_source| the event handler from |dest|
+// If |dest| intersects the rect |rect_in_source| the event handler from |dest|
 // is returned. Otherwise NULL is returned.
-views::View* ConvertPointToViewAndGetEventHandler(
+views::View* ConvertRectToViewAndGetEventHandler(
     views::View* source,
     views::View* dest,
-    const gfx::Point& point_in_source) {
-  gfx::Point dest_point(point_in_source);
-  views::View::ConvertPointToTarget(source, dest, &dest_point);
-  return dest->HitTestPoint(dest_point) ?
-      dest->GetEventHandlerForPoint(dest_point) : NULL;
+    const gfx::Rect& rect_in_source) {
+  gfx::Rect dest_rect(rect_in_source);
+  views::View::ConvertRectToTarget(source, dest, &dest_rect);
+  return dest->HitTestRect(dest_rect) ?
+      dest->GetEventHandlerForRect(dest_rect) : NULL;
 }
 
 // Gets a tooltip handler for |point_in_source| from |dest|. Note that |dest|
@@ -907,22 +907,25 @@ void TabStrip::UpdateLoadingAnimations() {
 }
 
 bool TabStrip::IsPositionInWindowCaption(const gfx::Point& point) {
-  views::View* v = GetEventHandlerForPoint(point);
+  return IsRectInWindowCaption(gfx::Rect(point, gfx::Size(1, 1)));
+}
+
+bool TabStrip::IsRectInWindowCaption(const gfx::Rect& rect) {
+  views::View* v = GetEventHandlerForRect(rect);
 
   // If there is no control at this location, claim the hit was in the title
   // bar to get a move action.
   if (v == this)
     return true;
 
-  // Check to see if the point is within the non-button parts of the new tab
+  // Check to see if the rect intersects the non-button parts of the new tab
   // button. The button has a non-rectangular shape, so if it's not in the
   // visual portions of the button we treat it as a click to the caption.
-  gfx::Point point_in_newtab_coords(point);
-  View::ConvertPointToTarget(this, newtab_button_, &point_in_newtab_coords);
-  if (newtab_button_->GetLocalBounds().Contains(point_in_newtab_coords) &&
-      !newtab_button_->HitTestPoint(point_in_newtab_coords)) {
+  gfx::Rect rect_in_newtab_coords(rect);
+  View::ConvertRectToTarget(this, newtab_button_, &rect_in_newtab_coords);
+  if (newtab_button_->GetLocalBounds().Intersects(rect_in_newtab_coords) &&
+      !newtab_button_->HitTestRect(rect_in_newtab_coords))
     return true;
-  }
 
   // All other regions, including the new Tab button, should be considered part
   // of the containing Window's client area so that regular events can be
@@ -1428,27 +1431,30 @@ void TabStrip::GetAccessibleState(ui::AccessibleViewState* state) {
   state->role = ui::AccessibilityTypes::ROLE_PAGETABLIST;
 }
 
-views::View* TabStrip::GetEventHandlerForPoint(const gfx::Point& point) {
+views::View* TabStrip::GetEventHandlerForRect(const gfx::Rect& rect) {
+  if (!View::UsePointBasedTargeting(rect))
+    return View::GetEventHandlerForRect(rect);
+
   if (!touch_layout_.get()) {
     // Return any view that isn't a Tab or this TabStrip immediately. We don't
     // want to interfere.
-    views::View* v = View::GetEventHandlerForPoint(point);
+    views::View* v = View::GetEventHandlerForRect(rect);
     if (v && v != this && strcmp(v->GetClassName(), Tab::kViewClassName))
       return v;
 
-    views::View* tab = FindTabHitByPoint(point);
+    views::View* tab = FindTabHitByPoint(rect.CenterPoint());
     if (tab)
       return tab;
   } else {
     if (newtab_button_->visible()) {
       views::View* view =
-          ConvertPointToViewAndGetEventHandler(this, newtab_button_, point);
+          ConvertRectToViewAndGetEventHandler(this, newtab_button_, rect);
       if (view)
         return view;
     }
-    Tab* tab = FindTabForEvent(point);
+    Tab* tab = FindTabForEvent(rect.CenterPoint());
     if (tab)
-      return ConvertPointToViewAndGetEventHandler(this, tab, point);
+      return ConvertRectToViewAndGetEventHandler(this, tab, rect);
   }
   return this;
 }
@@ -2591,6 +2597,13 @@ bool TabStrip::IsPointInTab(Tab* tab,
   return tab->HitTestPoint(point_in_tab_coords);
 }
 
+bool TabStrip::IsRectInTab(Tab* tab,
+                           const gfx::Rect& rect_in_tabstrip_coords) {
+  gfx::Rect rect_in_tab_coords(rect_in_tabstrip_coords);
+  View::ConvertRectToTarget(this, tab, &rect_in_tab_coords);
+  return tab->HitTestRect(rect_in_tab_coords);
+}
+
 int TabStrip::GetStartXForNormalTabs() const {
   int mini_tab_count = GetMiniTabCount();
   if (mini_tab_count == 0)