ui/views/view_targeter_delegate.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_VIEWS_VIEW_TARGETER_DELEGATE_H_
   6 #define UI_VIEWS_VIEW_TARGETER_DELEGATE_H_
   7
   8 #include "base/macros.h"
   9 #include "ui/views/views_export.h"
  10
  11 namespace gfx {
  12 class Rect;
  13 }
  14
  15 namespace views {
  16 class View;
  17
  18 // Defines the default behaviour for hit-testing a rectangular region against
  19 // the bounds of a View. Subclasses of View wishing to define custom
  20 // hit-testing behaviour can extend this class.
  21 class VIEWS_EXPORT ViewTargeterDelegate {
  22  public:
  23   ViewTargeterDelegate() {}
  24   virtual ~ViewTargeterDelegate() {}
  25
  26   // Returns true if the bounds of |target| intersects |rect|, where |rect|
  27   // is in the local coodinate space of |target|. Overrides of this method by
  28   // a View subclass should enforce DCHECK_EQ(this, target).
  29   virtual bool DoesIntersectRect(const View* target,
  30                                  const gfx::Rect& rect) const;
  31
  32  private:
  33   DISALLOW_COPY_AND_ASSIGN(ViewTargeterDelegate);
  34 };
  35
  36 }  // namespace views
  37
  38 #endif  // UI_VIEWS_VIEW_TARGETER_DELEGATE_H_