Create abstract common base class for impl scrollbars.

cc/scrollbar_layer_impl.cc

 // 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.
 
 #include "cc/scrollbar_layer_impl.h"
 
 #include "cc/quad_sink.h"
 #include "cc/scrollbar_animation_controller.h"
 #include "cc/texture_draw_quad.h"
 #include "ui/gfx/rect_conversions.h"
 
 using WebKit::WebRect;
 using WebKit::WebScrollbar;
 
 namespace cc {
 
 scoped_ptr<ScrollbarLayerImpl> ScrollbarLayerImpl::create(LayerTreeImpl* treeImpl, int id)
 {
     return make_scoped_ptr(new ScrollbarLayerImpl(treeImpl, id));
 }
 
 ScrollbarLayerImpl::ScrollbarLayerImpl(LayerTreeImpl* treeImpl, int id)
-    : LayerImpl(treeImpl, id)
+    : ScrollbarLayerImplBase(treeImpl, id)
     , m_scrollbar(this)
     , m_backTrackResourceId(0)
     , m_foreTrackResourceId(0)
     , m_thumbResourceId(0)
     , m_scrollbarOverlayStyle(WebScrollbar::ScrollbarOverlayStyleDefault)
     , m_orientation(WebScrollbar::Horizontal)
     , m_controlSize(WebScrollbar::RegularScrollbar)
     , m_pressedPart(WebScrollbar::NoPart)
     , m_hoveredPart(WebScrollbar::NoPart)
     , m_isScrollableAreaActive(false)
@@ skipping 24 matching lines @@
     m_isScrollViewScrollbar = scrollbar->isScrollViewScrollbar();
     m_enabled = scrollbar->enabled();
     m_isCustomScrollbar = scrollbar->isCustomScrollbar();
     m_isOverlayScrollbar = scrollbar->isOverlay();
 
     scrollbar->getTickmarks(m_tickmarks);
 
     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());
 }
 
 gfx::Rect ScrollbarLayerImpl::scrollbarLayerRectToContentRect(const gfx::Rect& layerRect) const
 {
     // Don't intersect with the bounds as in layerRectToContentRect() because
     // layerRect here might be in coordinates of the containing layer.
     gfx::RectF contentRect = gfx::ScaleRect(layerRect, contentsScaleX(), contentsScaleY());
@@ skipping 136 matching lines @@
 {
     return m_owner->m_isCustomScrollbar;
 }
 
 const char* ScrollbarLayerImpl::layerTypeAsString() const
 {
     return "ScrollbarLayer";
 }
 
 }  // namespace cc