| /* |
| * Copyright (C) 2008 Apple Inc. All Rights Reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_LAYOUT_SCROLLBAR_PART_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_LAYOUT_SCROLLBAR_PART_H_ |
| |
| #include "third_party/blink/renderer/core/layout/layout_block.h" |
| #include "third_party/blink/renderer/core/scroll/scroll_types.h" |
| |
| namespace blink { |
| |
| class LayoutScrollbar; |
| class ScrollableArea; |
| |
| class LayoutScrollbarPart final : public LayoutBlock { |
| public: |
| static LayoutScrollbarPart* CreateAnonymous(Document*, |
| ScrollableArea*, |
| LayoutScrollbar* = nullptr, |
| ScrollbarPart = kNoPart); |
| |
| const char* GetName() const override { return "LayoutScrollbarPart"; } |
| |
| PaintLayerType LayerTypeRequired() const override { return kNoPaintLayer; } |
| |
| void UpdateLayout() override; |
| |
| static int ComputeScrollbarWidth(int visible_size, const ComputedStyle*); |
| static int ComputeScrollbarHeight(int visible_size, const ComputedStyle*); |
| |
| // Scrollbar parts needs to be rendered at device pixel boundaries. |
| LayoutUnit MarginTop() const override { |
| DCHECK(IsIntegerValue(LayoutBlock::MarginTop())); |
| return LayoutBlock::MarginTop(); |
| } |
| LayoutUnit MarginBottom() const override { |
| DCHECK(IsIntegerValue(LayoutBlock::MarginBottom())); |
| return LayoutBlock::MarginBottom(); |
| } |
| LayoutUnit MarginLeft() const override { |
| DCHECK(IsIntegerValue(LayoutBlock::MarginLeft())); |
| return LayoutBlock::MarginLeft(); |
| } |
| LayoutUnit MarginRight() const override { |
| DCHECK(IsIntegerValue(LayoutBlock::MarginRight())); |
| return LayoutBlock::MarginRight(); |
| } |
| |
| bool IsOfType(LayoutObjectType type) const override { |
| return type == kLayoutObjectLayoutScrollbarPart || |
| LayoutBlock::IsOfType(type); |
| } |
| ScrollableArea* GetScrollableArea() const { return scrollable_area_; } |
| |
| // Must call setStyleWithWritingModeOfParent() instead. |
| void SetStyle(scoped_refptr<ComputedStyle>) = delete; |
| |
| protected: |
| void StyleWillChange(StyleDifference, |
| const ComputedStyle& new_style) override; |
| void StyleDidChange(StyleDifference, const ComputedStyle* old_style) override; |
| void ImageChanged(WrappedImagePtr, CanDeferInvalidation) override; |
| |
| private: |
| LayoutScrollbarPart(ScrollableArea*, LayoutScrollbar*, ScrollbarPart); |
| |
| void ComputePreferredLogicalWidths() override; |
| |
| // Have all padding getters return 0. The important point here is to avoid |
| // resolving percents against the containing block, since scroll bar corners |
| // don't always have one (so it would crash). Scroll bar corners are not |
| // actually laid out, and they don't have child content, so what we return |
| // here doesn't really matter. |
| LayoutUnit PaddingTop() const override { return LayoutUnit(); } |
| LayoutUnit PaddingBottom() const override { return LayoutUnit(); } |
| LayoutUnit PaddingLeft() const override { return LayoutUnit(); } |
| LayoutUnit PaddingRight() const override { return LayoutUnit(); } |
| |
| void LayoutHorizontalPart(); |
| void LayoutVerticalPart(); |
| |
| void UpdateScrollbarWidth(); |
| void UpdateScrollbarHeight(); |
| |
| void SetNeedsPaintInvalidation(); |
| |
| bool AllowsOverflowClip() const override { return false; } |
| |
| UntracedMember<ScrollableArea> scrollable_area_; |
| UntracedMember<LayoutScrollbar> scrollbar_; |
| ScrollbarPart part_; |
| }; |
| |
| DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutScrollbarPart, IsLayoutScrollbarPart()); |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_LAYOUT_SCROLLBAR_PART_H_ |