Refactor cc scrollbar layers to separate solid-color vs desktop.

cc/layers/scrollbar_layer_impl_base.h

Index: cc/layers/scrollbar_layer_impl_base.h
diff --git a/cc/layers/scrollbar_layer_impl_base.h b/cc/layers/scrollbar_layer_impl_base.h
new file mode 100644
index 0000000000000000000000000000000000000000..0a9fe88b65ad2c1e88564a9cfc71131d00155a49
--- /dev/null
+++ b/cc/layers/scrollbar_layer_impl_base.h
@@ -0,0 +1,74 @@
+// Copyright 2012 The Chromium Authors. All rights reserved.

[tfarina, 2013/07/04 22:30:26]

update the year in new files to 2013. applies to other files as well.

[wjmaclean, 2013/07/05 17:06:25]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CC_LAYERS_SCROLLBAR_LAYER_IMPL_BASE_H_
+#define CC_LAYERS_SCROLLBAR_LAYER_IMPL_BASE_H_
+
+#include "cc/base/cc_export.h"
+#include "cc/input/scrollbar.h"
+#include "cc/layers/layer.h"

[tfarina, 2013/07/04 22:30:26]

do you need this include? if you do, can't you forward declare it?

[wjmaclean, 2013/07/05 17:06:25]

It's needed for the constant Layer::INVALID_ID, but I moved the constructor
implementation to the .cc file, some we no longer need it here.

+#include "cc/layers/layer_impl.h"
+
+namespace cc {
+
+class LayerTreeImpl;
+
+class CC_EXPORT ScrollbarLayerImplBase : public LayerImpl {
+ public:
+  int scroll_layer_id() const { return scroll_layer_id_; }
+  void set_scroll_layer_id(int id) { scroll_layer_id_ = id; }
+
+  float CurrentPos() const { return current_pos_; }

[tfarina, 2013/07/04 22:30:26]

unix_hacker(), applies until SetMaximum

[wjmaclean, 2013/07/05 17:06:25]

Done.

+  void SetCurrentPos(float pos) { current_pos_ = pos; }
+  int Maximum() const { return maximum_; }
+  void SetMaximum(int maximum) { maximum_ = maximum; }
+
+  void set_visible_to_total_length_ratio(float ratio) {
+    visible_to_total_length_ratio_ = ratio;
+  }
+
+  void set_vertical_adjust(float vertical_adjust) {
+    vertical_adjust_ = vertical_adjust;
+  }
+
+  ScrollbarOrientation Orientation() const { return orientation_; }

[tfarina, 2013/07/04 22:30:26]

unix_hacker

[wjmaclean, 2013/07/05 17:06:25]

Done.

+
+  virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
+  virtual ScrollbarLayerImplBase* ToScrollbarLayerBase() OVERRIDE;
+
+  virtual gfx::Rect ComputeThumbQuadRect() const = 0;
+
+ protected:
+  ScrollbarLayerImplBase(LayerTreeImpl* tree_impl,
+                         int id,
+                         ScrollbarOrientation orientation)
+      : LayerImpl(tree_impl, id),
+        scroll_layer_id_(Layer::INVALID_ID),
+        current_pos_(0.f),
+        maximum_(0),
+        orientation_(orientation),
+        visible_to_total_length_ratio_(1.f),

[tfarina, 2013/07/04 22:30:26]

can you do all this initialization in the source file instead? I guess clang
isn't complaining because they are all POD?

[wjmaclean, 2013/07/05 17:06:25]

Done.

+        vertical_adjust_(0.f) {}
+  virtual ~ScrollbarLayerImplBase() {}
+
+  gfx::Rect ScrollbarLayerRectToContentRect(gfx::RectF layer_rect) const;
+  gfx::Rect ComputeThumbQuadRectInternal(int thumb_length,
+                                         float track_length,
+                                         int track_start,
+                                         int thumb_thickness) const;
+
+  int scroll_layer_id_;

[tfarina, 2013/07/04 22:30:26]

these data member variables should be private.

See:
http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml?showone=Inheri...

You have exposed other data members in other class in protected section too.

[wjmaclean, 2013/07/05 17:06:25]

Done.

+
+  float current_pos_;
+  int maximum_;
+  ScrollbarOrientation orientation_;
+
+  float visible_to_total_length_ratio_;
+  // Difference between the clip layer's height and the visible viewport
+  // height (which may differ in the presence of top-controls hiding).
+  float vertical_adjust_;
+};

[tfarina, 2013/07/04 22:30:26]

DISALLOW_ ....

[wjmaclean, 2013/07/05 17:06:25]

Done.

+
+}  // namespace cc
+#endif  // CC_LAYERS_SCROLLBAR_LAYER_IMPL_BASE_H_

[tfarina, 2013/07/04 22:30:26]

tinynit: add blank line above.

[wjmaclean, 2013/07/05 17:06:25]

Done.