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scrollbar_impl.cc
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scrollbar_impl.cc
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// 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 "cc/blink/scrollbar_impl.h"
#include "base/logging.h"
#include "third_party/WebKit/public/platform/WebScrollbar.h"
#include "third_party/WebKit/public/platform/WebScrollbarThemeGeometry.h"
using blink::WebScrollbar;
namespace cc_blink {
ScrollbarImpl::ScrollbarImpl(
std::unique_ptr<WebScrollbar> scrollbar,
blink::WebScrollbarThemePainter painter,
std::unique_ptr<blink::WebScrollbarThemeGeometry> geometry)
: scrollbar_(std::move(scrollbar)),
painter_(painter),
geometry_(std::move(geometry)) {}
ScrollbarImpl::~ScrollbarImpl() {
}
cc::ScrollbarOrientation ScrollbarImpl::Orientation() const {
if (scrollbar_->GetOrientation() == WebScrollbar::kHorizontal)
return cc::HORIZONTAL;
return cc::VERTICAL;
}
bool ScrollbarImpl::IsLeftSideVerticalScrollbar() const {
return scrollbar_->IsLeftSideVerticalScrollbar();
}
bool ScrollbarImpl::HasThumb() const {
return geometry_->HasThumb(scrollbar_.get());
}
bool ScrollbarImpl::IsOverlay() const {
return scrollbar_->IsOverlay();
}
gfx::Point ScrollbarImpl::Location() const {
return scrollbar_->Location();
}
int ScrollbarImpl::ThumbThickness() const {
gfx::Rect thumb_rect = geometry_->ThumbRect(scrollbar_.get());
if (scrollbar_->GetOrientation() == WebScrollbar::kHorizontal)
return thumb_rect.height();
return thumb_rect.width();
}
int ScrollbarImpl::ThumbLength() const {
gfx::Rect thumb_rect = geometry_->ThumbRect(scrollbar_.get());
if (scrollbar_->GetOrientation() == WebScrollbar::kHorizontal)
return thumb_rect.width();
return thumb_rect.height();
}
gfx::Rect ScrollbarImpl::TrackRect() const {
return geometry_->TrackRect(scrollbar_.get());
}
float ScrollbarImpl::ThumbOpacity() const {
return painter_.ThumbOpacity();
}
bool ScrollbarImpl::NeedsPaintPart(cc::ScrollbarPart part) const {
if (part == cc::THUMB)
return painter_.ThumbNeedsRepaint();
return painter_.TrackNeedsRepaint();
}
bool ScrollbarImpl::UsesNinePatchThumbResource() const {
return painter_.UsesNinePatchThumbResource();
}
gfx::Size ScrollbarImpl::NinePatchThumbCanvasSize() const {
return geometry_->NinePatchThumbCanvasSize(scrollbar_.get());
}
gfx::Rect ScrollbarImpl::NinePatchThumbAperture() const {
return geometry_->NinePatchThumbAperture(scrollbar_.get());
}
void ScrollbarImpl::PaintPart(cc::PaintCanvas* canvas,
cc::ScrollbarPart part,
const gfx::Rect& content_rect) {
if (part == cc::THUMB) {
painter_.PaintThumb(canvas, content_rect);
return;
}
// The following is a simplification of ScrollbarThemeComposite::paint.
painter_.PaintScrollbarBackground(canvas, content_rect);
if (geometry_->HasButtons(scrollbar_.get())) {
gfx::Rect back_button_start_paint_rect =
geometry_->BackButtonStartRect(scrollbar_.get());
painter_.PaintBackButtonStart(canvas, back_button_start_paint_rect);
gfx::Rect back_button_end_paint_rect =
geometry_->BackButtonEndRect(scrollbar_.get());
painter_.PaintBackButtonEnd(canvas, back_button_end_paint_rect);
gfx::Rect forward_button_start_paint_rect =
geometry_->ForwardButtonStartRect(scrollbar_.get());
painter_.PaintForwardButtonStart(canvas, forward_button_start_paint_rect);
gfx::Rect forward_button_end_paint_rect =
geometry_->ForwardButtonEndRect(scrollbar_.get());
painter_.PaintForwardButtonEnd(canvas, forward_button_end_paint_rect);
}
gfx::Rect track_paint_rect = geometry_->TrackRect(scrollbar_.get());
painter_.PaintTrackBackground(canvas, track_paint_rect);
bool thumb_present = geometry_->HasThumb(scrollbar_.get());
if (thumb_present) {
painter_.PaintForwardTrackPart(canvas, track_paint_rect);
painter_.PaintBackTrackPart(canvas, track_paint_rect);
}
painter_.PaintTickmarks(canvas, track_paint_rect);
}
} // namespace cc_blink