cc/scrollbar_geometry_stub.h

   1 // Copyright 2012 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 CC_SCROLLBAR_GEOMETRY_STUB_H_
   6 #define CC_SCROLLBAR_GEOMETRY_STUB_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "cc/cc_export.h"
  10 #include <public/WebScrollbarThemeGeometry.h>
  11
  12 namespace cc {
  13
  14 // This subclass wraps an existing scrollbar geometry class so that
  15 // another class can derive from it and override specific functions, while
  16 // passing through the remaining ones.
  17 class CC_EXPORT ScrollbarGeometryStub : public NON_EXPORTED_BASE(WebKit::WebScrollbarThemeGeometry) {
  18 public:
  19     virtual ~ScrollbarGeometryStub();
  20
  21     // Allow derived classes to update themselves from a scrollbar.
  22     void update(WebKit::WebScrollbar*) { }
  23
  24     // WebScrollbarThemeGeometry interface
  25     virtual WebKit::WebScrollbarThemeGeometry* clone() const OVERRIDE;
  26     virtual int thumbPosition(WebKit::WebScrollbar*) OVERRIDE;
  27     virtual int thumbLength(WebKit::WebScrollbar*) OVERRIDE;
  28     virtual int trackPosition(WebKit::WebScrollbar*) OVERRIDE;
  29     virtual int trackLength(WebKit::WebScrollbar*) OVERRIDE;
  30     virtual bool hasButtons(WebKit::WebScrollbar*) OVERRIDE;
  31     virtual bool hasThumb(WebKit::WebScrollbar*) OVERRIDE;
  32     virtual WebKit::WebRect trackRect(WebKit::WebScrollbar*) OVERRIDE;
  33     virtual WebKit::WebRect thumbRect(WebKit::WebScrollbar*) OVERRIDE;
  34     virtual int minimumThumbLength(WebKit::WebScrollbar*) OVERRIDE;
  35     virtual int scrollbarThickness(WebKit::WebScrollbar*) OVERRIDE;
  36     virtual WebKit::WebRect backButtonStartRect(WebKit::WebScrollbar*) OVERRIDE;
  37     virtual WebKit::WebRect backButtonEndRect(WebKit::WebScrollbar*) OVERRIDE;
  38     virtual WebKit::WebRect forwardButtonStartRect(WebKit::WebScrollbar*) OVERRIDE;
  39     virtual WebKit::WebRect forwardButtonEndRect(WebKit::WebScrollbar*) OVERRIDE;
  40     virtual WebKit::WebRect constrainTrackRectToTrackPieces(WebKit::WebScrollbar*, const WebKit::WebRect&) OVERRIDE;
  41     virtual void splitTrack(WebKit::WebScrollbar*, const WebKit::WebRect& track, WebKit::WebRect& startTrack, WebKit::WebRect& thumb, WebKit::WebRect& endTrack) OVERRIDE;
  42
  43 protected:
  44     explicit ScrollbarGeometryStub(scoped_ptr<WebKit::WebScrollbarThemeGeometry>);
  45
  46 private:
  47     scoped_ptr<WebKit::WebScrollbarThemeGeometry> m_geometry;
  48
  49     DISALLOW_COPY_AND_ASSIGN(ScrollbarGeometryStub);
  50 };
  51
  52 }
  53
  54 #endif  // CC_SCROLLBAR_GEOMETRY_STUB_H_