Create abstract common base class for impl scrollbars.

BUG=None

NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/11573015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@173466 0039d316-1c4b-4281-b951-d872f2087c98

cc/cc.gyp

@@ -212,6 +212,7 @@
       'scrollbar_layer.h',
       'scrollbar_layer_impl.cc',
       'scrollbar_layer_impl.h',
+      'scrollbar_layer_impl_base.h',
       'shader.cc',
       'shader.h',
       'shared_quad_state.cc',

cc/scrollbar_layer_impl.cc

@@ -20,7 +20,7 @@ scoped_ptr<ScrollbarLayerImpl> ScrollbarLayerImpl::create(LayerTreeImpl* treeImp
 }
 
 ScrollbarLayerImpl::ScrollbarLayerImpl(LayerTreeImpl* treeImpl, int id)
-    : LayerImpl(treeImpl, id)
+    : ScrollbarLayerImplBase(treeImpl, id)
     , m_scrollbar(this)
     , m_backTrackResourceId(0)
     , m_foreTrackResourceId(0)
@@ -65,6 +65,26 @@ void ScrollbarLayerImpl::setScrollbarData(WebScrollbar* scrollbar)
     m_geometry->update(scrollbar);
 }
 
+float ScrollbarLayerImpl::currentPos() const
+{
+    return m_currentPos;
+}
+
+int ScrollbarLayerImpl::totalSize() const
+{
+    return m_totalSize;
+}
+
+int ScrollbarLayerImpl::maximum() const
+{
+    return m_maximum;
+}
+
+WebKit::WebScrollbar::Orientation ScrollbarLayerImpl::orientation() const
+{
+    return m_orientation;
+}
+
 static gfx::RectF toUVRect(const gfx::Rect& r, const gfx::Rect& bounds)
 {
     return gfx::ScaleRect(r, 1.0 / bounds.width(), 1.0 / bounds.height());

cc/scrollbar_layer_impl.h

@@ -6,17 +6,16 @@
 #define CC_SCROLLBAR_LAYER_IMPL_H_
 
 #include "cc/cc_export.h"
-#include "cc/layer_impl.h"
 #include "cc/scrollbar_geometry_fixed_thumb.h"
+#include "cc/scrollbar_layer_impl_base.h"
 #include <public/WebRect.h>
-#include <public/WebScrollbar.h>
 #include <public/WebVector.h>
 
 namespace cc {
 
 class ScrollView;
 
-class CC_EXPORT ScrollbarLayerImpl : public LayerImpl {
+class CC_EXPORT ScrollbarLayerImpl : public ScrollbarLayerImplBase {
 public:
     static scoped_ptr<ScrollbarLayerImpl> create(LayerTreeImpl* treeImpl, int id);
     virtual ~ScrollbarLayerImpl();
@@ -29,16 +28,16 @@ public:
     void setForeTrackResourceId(ResourceProvider::ResourceId id) { m_foreTrackResourceId = id; }
     void setThumbResourceId(ResourceProvider::ResourceId id) { m_thumbResourceId = id; }
 
-    float currentPos() const { return m_currentPos; }
+    virtual float currentPos() const OVERRIDE;
     void setCurrentPos(float currentPos) { m_currentPos = currentPos; }
 
-    int totalSize() const { return m_totalSize; }
+    virtual int totalSize() const OVERRIDE;
     void setTotalSize(int totalSize) { m_totalSize = totalSize; }
 
-    int maximum() const { return m_maximum; }
+    virtual int maximum() const OVERRIDE;
     void setMaximum(int maximum) { m_maximum = maximum; }
 
-    WebKit::WebScrollbar::Orientation orientation() const { return m_orientation; }
+    virtual WebKit::WebScrollbar::Orientation orientation() const OVERRIDE;
 
     virtual void appendQuads(QuadSink&, AppendQuadsData&) OVERRIDE;
 

cc/scrollbar_layer_impl_base.h

@@ -0,0 +1,30 @@
+// Copyright 2012 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 CC_SCROLLBAR_LAYER_IMPL_BASE_H_
+#define CC_SCROLLBAR_LAYER_IMPL_BASE_H_
+
+#include "cc/cc_export.h"
+#include "cc/layer_impl.h"
+#include <public/WebScrollbar.h>
+
+namespace cc {
+
+class CC_EXPORT ScrollbarLayerImplBase : public LayerImpl {
+public:
+    virtual ~ScrollbarLayerImplBase() { }
+
+    virtual float currentPos() const = 0;
+    virtual int totalSize() const = 0;
+    virtual int maximum() const = 0;
+    virtual WebKit::WebScrollbar::Orientation orientation() const = 0;
+
+protected:
+    ScrollbarLayerImplBase(LayerTreeImpl* treeImpl, int id)
+        : LayerImpl(treeImpl, id) { }
+
+};
+
+} // namespace cc
+#endif // CC_SCROLLBAR_LAYER_IMPL_BASE_H_