Introduce ViewTargeterDelegate and MaskedTargeterDelegate

These two classes define the default hit-testing behaviour
for views with and without hit-test masks. Views wishing
to define their own hit-testing behaviour will extend
one of these classes.

BUG=388838
TEST=ViewTargeterTest.DoesIntersectRect

Review URL: https://codereview.chromium.org/336953005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@280713 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 38 insertions, 0 deletions

diff --git a/ui/views/view_targeter_delegate.h b/ui/views/view_targeter_delegate.h
new file mode 100644
index 0000000..134a879
--- /dev/null
+++ b/ui/views/view_targeter_delegate.h
@@ -0,0 +1,38 @@
+// 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_VIEWS_VIEW_TARGETER_DELEGATE_H_
+#define UI_VIEWS_VIEW_TARGETER_DELEGATE_H_
+
+#include "base/macros.h"
+#include "ui/views/views_export.h"
+
+namespace gfx {
+class Rect;
+}
+
+namespace views {
+class View;
+
+// Defines the default behaviour for hit-testing a rectangular region against
+// the bounds of a View. Subclasses of View wishing to define custom
+// hit-testing behaviour can extend this class.
+class VIEWS_EXPORT ViewTargeterDelegate {
+ public:
+  ViewTargeterDelegate() {}
+  virtual ~ViewTargeterDelegate() {}
+
+  // Returns true if the bounds of |target| intersects |rect|, where |rect|
+  // is in the local coodinate space of |target|. Overrides of this method by
+  // a View subclass should enforce DCHECK_EQ(this, target).
+  virtual bool DoesIntersectRect(const View* target,
+                                 const gfx::Rect& rect) const;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ViewTargeterDelegate);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_VIEW_TARGETER_DELEGATE_H_