| /* |
| * 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_CUSTOM_SCROLLBAR_PART_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_LAYOUT_CUSTOM_SCROLLBAR_PART_H_ |
| |
| #include "third_party/blink/renderer/core/layout/layout_replaced.h" |
| #include "third_party/blink/renderer/core/scroll/scroll_types.h" |
| |
| namespace blink { |
| |
| class CustomScrollbar; |
| class ScrollableArea; |
| |
| class CORE_EXPORT LayoutCustomScrollbarPart final : public LayoutReplaced { |
| public: |
| static LayoutCustomScrollbarPart* CreateAnonymous(Document*, |
| ScrollableArea*, |
| CustomScrollbar* = nullptr, |
| ScrollbarPart = kNoPart); |
| |
| const char* GetName() const override { return "LayoutCustomScrollbarPart"; } |
| |
| PaintLayerType LayerTypeRequired() const override { return kNoPaintLayer; } |
| |
| // Computes thickness of the scrollbar (which defines thickness of all parts). |
| // For kScrollbarBGPart only. This can be called during style update. |
| // Percentage size will be ignored. |
| int ComputeThickness() const; |
| |
| // Computes size of the part in the direction of the scrollbar orientation. |
| // This doesn't apply to kScrollbarBGPart because its length is not determined |
| // by the style of the part of itself. For kThumbPart this returns the |
| // minimum length of the thumb. The length may depend on the size of the |
| // containing box, so this function can only be called after the size is |
| // available. |
| int ComputeLength() const; |
| |
| LayoutUnit MarginTop() const override; |
| LayoutUnit MarginBottom() const override; |
| LayoutUnit MarginLeft() const override; |
| LayoutUnit MarginRight() const override; |
| |
| bool IsOfType(LayoutObjectType type) const override { |
| return type == kLayoutObjectLayoutCustomScrollbarPart || |
| LayoutReplaced::IsOfType(type); |
| } |
| ScrollableArea* GetScrollableArea() const { return scrollable_area_; } |
| |
| private: |
| LayoutCustomScrollbarPart(ScrollableArea*, CustomScrollbar*, ScrollbarPart); |
| |
| void UpdateFromStyle() override; |
| void StyleDidChange(StyleDifference, const ComputedStyle* old_style) override; |
| void ImageChanged(WrappedImagePtr, CanDeferInvalidation) override; |
| |
| // A scrollbar part's Location() and PhysicalLocation() are relative to the |
| // scrollbar (instead of relative to any LayoutBox ancestor), and both are |
| // in physical coordinates. |
| LayoutBox* LocationContainer() const override { return nullptr; } |
| |
| // A scrollbar part is not in the layout tree and is not laid out like other |
| // layout objects. CustomScrollbar will call scrollbar parts' SetFrameRect() |
| // from its SetFrameRect() when needed. |
| void UpdateLayout() override { NOTREACHED(); } |
| |
| // 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 SetNeedsPaintInvalidation(); |
| |
| void RecordPercentLengthStats() const; |
| |
| int ComputeSize(SizeType size_type, |
| const Length& length, |
| int container_size) const; |
| int ComputeWidth(int container_width) const; |
| int ComputeHeight(int container_height) const; |
| |
| UntracedMember<ScrollableArea> scrollable_area_; |
| UntracedMember<CustomScrollbar> scrollbar_; |
| |
| ScrollbarPart part_; |
| }; |
| |
| DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutCustomScrollbarPart, |
| IsLayoutCustomScrollbarPart()); |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_LAYOUT_CUSTOM_SCROLLBAR_PART_H_ |