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// Copyright 2019 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/layers/scrollbar_layer_base.h"
#include "cc/layers/painted_overlay_scrollbar_layer.h"
#include "cc/layers/painted_scrollbar_layer.h"
#include "cc/layers/scrollbar_layer_impl_base.h"
#include "cc/layers/solid_color_scrollbar_layer.h"
namespace cc {
ScrollbarLayerBase::ScrollbarLayerBase(ScrollbarOrientation orientation,
bool is_left_side_vertical_scrollbar)
: orientation_(orientation),
is_left_side_vertical_scrollbar_(is_left_side_vertical_scrollbar) {}
ScrollbarLayerBase::~ScrollbarLayerBase() = default;
scoped_refptr<ScrollbarLayerBase> ScrollbarLayerBase::CreateOrReuse(
scoped_refptr<Scrollbar> scrollbar,
ScrollbarLayerBase* existing_layer) {
DCHECK(scrollbar);
ScrollbarLayerType needed_type = kPainted;
if (scrollbar->IsSolidColor()) {
needed_type = kSolidColor;
} else if (scrollbar->UsesNinePatchThumbResource()) {
DCHECK(scrollbar->IsOverlay());
needed_type = kPaintedOverlay;
}
if (existing_layer &&
(existing_layer->GetScrollbarLayerType() != needed_type ||
// We don't support change of these fields in a layer.
existing_layer->orientation() != scrollbar->Orientation() ||
existing_layer->is_left_side_vertical_scrollbar() !=
scrollbar->IsLeftSideVerticalScrollbar())) {
existing_layer = nullptr;
}
switch (needed_type) {
case kSolidColor:
return SolidColorScrollbarLayer::CreateOrReuse(
std::move(scrollbar),
static_cast<SolidColorScrollbarLayer*>(existing_layer));
case kPainted:
return PaintedScrollbarLayer::CreateOrReuse(
std::move(scrollbar),
static_cast<PaintedScrollbarLayer*>(existing_layer));
case kPaintedOverlay:
return PaintedOverlayScrollbarLayer::CreateOrReuse(
std::move(scrollbar),
static_cast<PaintedOverlayScrollbarLayer*>(existing_layer));
}
NOTREACHED();
return nullptr;
}
void ScrollbarLayerBase::SetScrollElementId(ElementId element_id) {
if (element_id == scroll_element_id_)
return;
scroll_element_id_ = element_id;
SetNeedsCommit();
}
void ScrollbarLayerBase::PushPropertiesTo(LayerImpl* layer) {
Layer::PushPropertiesTo(layer);
auto* scrollbar_layer_impl = static_cast<ScrollbarLayerImplBase*>(layer);
DCHECK_EQ(scrollbar_layer_impl->orientation(), orientation_);
DCHECK_EQ(scrollbar_layer_impl->is_left_side_vertical_scrollbar(),
is_left_side_vertical_scrollbar_);
scrollbar_layer_impl->SetScrollElementId(scroll_element_id_);
}
bool ScrollbarLayerBase::IsScrollbarLayerForTesting() const {
return true;
}
} // namespace cc
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