content/renderer/compositor_bindings/web_scrollbar_layer_impl.cc

// Copyright 2014 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 "content/renderer/compositor_bindings/web_scrollbar_layer_impl.h"

#include "cc/layers/layer.h"
#include "cc/layers/painted_scrollbar_layer.h"
#include "cc/layers/scrollbar_layer_interface.h"
#include "cc/layers/solid_color_scrollbar_layer.h"
#include "content/renderer/compositor_bindings/scrollbar_impl.h"
#include "content/renderer/compositor_bindings/web_layer_impl.h"

using cc::PaintedScrollbarLayer;
using cc::SolidColorScrollbarLayer;

namespace {

cc::ScrollbarOrientation ConvertOrientation(
    blink::WebScrollbar::Orientation orientation) {
  return orientation == blink::WebScrollbar::Horizontal ? cc::HORIZONTAL
                                                        : cc::VERTICAL;
}

}  // namespace

namespace content {

WebScrollbarLayerImpl::WebScrollbarLayerImpl(
    blink::WebScrollbar* scrollbar,
    blink::WebScrollbarThemePainter painter,
    blink::WebScrollbarThemeGeometry* geometry)
    : layer_(new WebLayerImpl(PaintedScrollbarLayer::Create(
          scoped_ptr<cc::Scrollbar>(
              new ScrollbarImpl(make_scoped_ptr(scrollbar),
                                painter,
                                make_scoped_ptr(geometry))).Pass(),
          0))) {
}

WebScrollbarLayerImpl::WebScrollbarLayerImpl(
    blink::WebScrollbar::Orientation orientation,
    int thumb_thickness,
    int track_start,
    bool is_left_side_vertical_scrollbar)
    : layer_(new WebLayerImpl(
          SolidColorScrollbarLayer::Create(ConvertOrientation(orientation),
                                           thumb_thickness,
                                           track_start,
                                           is_left_side_vertical_scrollbar,
                                           0))) {
}

WebScrollbarLayerImpl::~WebScrollbarLayerImpl() {
}

blink::WebLayer* WebScrollbarLayerImpl::layer() {
  return layer_.get();
}

void WebScrollbarLayerImpl::setScrollLayer(blink::WebLayer* layer) {
  cc::Layer* scroll_layer =
      layer ? static_cast<WebLayerImpl*>(layer)->layer() : 0;
  layer_->layer()->ToScrollbarLayer()->SetScrollLayer(scroll_layer->id());
}

void WebScrollbarLayerImpl::setClipLayer(blink::WebLayer* layer) {
  cc::Layer* clip_layer =
      layer ? static_cast<WebLayerImpl*>(layer)->layer() : 0;
  layer_->layer()->ToScrollbarLayer()->SetClipLayer(clip_layer->id());
}

}  // namespace content