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/*
* This file is part of the select element renderer in WebCore.
*
* Copyright (C) 2006-2023 Apple Inc. All rights reserved.
* Copyright (C) 2014 Google 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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.
*/
#pragma once
#include "RenderBlockFlow.h"
#include "ScrollableArea.h"
namespace WebCore {
class HTMLOptGroupElement;
class HTMLOptionElement;
class HTMLSelectElement;
class RenderListBox final : public RenderBlockFlow, public ScrollableArea {
WTF_MAKE_ISO_ALLOCATED(RenderListBox);
public:
RenderListBox(HTMLSelectElement&, RenderStyle&&);
virtual ~RenderListBox();
HTMLSelectElement& selectElement() const;
void selectionChanged();
void setOptionsChanged(bool changed) { m_optionsChanged = changed; }
int listIndexAtOffset(const LayoutSize&) const;
LayoutRect itemBoundingBoxRect(const LayoutPoint&, int index) const;
std::optional<LayoutRect> localBoundsOfOption(const HTMLOptionElement&) const;
std::optional<LayoutRect> localBoundsOfOptGroup(const HTMLOptGroupElement&) const;
bool scrollToRevealElementAtListIndex(int index);
bool listIndexIsVisible(int index);
int scrollToward(const IntPoint&); // Returns the new index or -1 if no scroll occurred
int size() const;
bool scroll(ScrollDirection, ScrollGranularity, unsigned stepCount = 1, Element** stopElement = nullptr, RenderBox* startBox = nullptr, const IntPoint& wheelEventAbsolutePoint = IntPoint()) override;
bool scrolledToTop() const final;
bool scrolledToBottom() const final;
bool scrolledToLeft() const final;
bool scrolledToRight() const final;
private:
bool isVisibleToHitTesting() const final;
void willBeDestroyed() override;
void element() const = delete;
ASCIILiteral renderName() const override { return "RenderListBox"_s; }
bool isListBox() const override { return true; }
void updateFromElement() override;
bool hasControlClip() const override { return true; }
void paintObject(PaintInfo&, const LayoutPoint&) override;
LayoutRect controlClipRect(const LayoutPoint&) const override;
bool isPointInOverflowControl(HitTestResult&, const LayoutPoint& locationInContainer, const LayoutPoint& accumulatedOffset) override;
bool logicalScroll(ScrollLogicalDirection, ScrollGranularity, unsigned stepCount = 1, Element** stopElement = nullptr) override;
void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
void computePreferredLogicalWidths() override;
LayoutUnit baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;
LogicalExtentComputedValues computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop) const override;
void layout() override;
void addFocusRingRects(Vector<LayoutRect>&, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer = nullptr) const override;
bool canBeProgramaticallyScrolled() const override { return true; }
void autoscroll(const IntPoint&) override;
void stopAutoscroll() override;
virtual bool shouldPanScroll() const { return true; }
void panScroll(const IntPoint&) override;
int verticalScrollbarWidth() const override;
int scrollLeft() const override;
int scrollTop() const override;
int scrollWidth() const override;
int scrollHeight() const override;
void setScrollLeft(int, const ScrollPositionChangeOptions&) override;
void setScrollTop(int, const ScrollPositionChangeOptions&) override;
bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) override;
// ScrollableArea interface.
bool hasSteppedScrolling() const final { return true; }
void setScrollOffset(const ScrollOffset&) final;
ScrollPosition scrollPosition() const final;
ScrollPosition minimumScrollPosition() const final;
ScrollPosition maximumScrollPosition() const final;
void invalidateScrollbarRect(Scrollbar&, const IntRect&) final;
bool isActive() const final;
bool isScrollCornerVisible() const final { return false; } // We don't support resize on list boxes yet. If we did these would have to change.
IntRect scrollCornerRect() const final { return IntRect(); }
void invalidateScrollCornerRect(const IntRect&) final { }
IntRect convertFromScrollbarToContainingView(const Scrollbar&, const IntRect&) const final;
IntRect convertFromContainingViewToScrollbar(const Scrollbar&, const IntRect&) const final;
IntPoint convertFromScrollbarToContainingView(const Scrollbar&, const IntPoint&) const final;
IntPoint convertFromContainingViewToScrollbar(const Scrollbar&, const IntPoint&) const final;
Scrollbar* verticalScrollbar() const final { return m_vBar.get(); }
IntSize contentsSize() const final;
IntSize visibleSize() const final { return IntSize(width(), height()); }
IntPoint lastKnownMousePositionInView() const final;
bool isHandlingWheelEvent() const final;
bool shouldSuspendScrollAnimations() const final;
bool forceUpdateScrollbarsOnMainThreadForPerformanceTesting() const final;
ScrollableArea* enclosingScrollableArea() const final;
bool isScrollableOrRubberbandable() final;
bool hasScrollableOrRubberbandableAncestor() final;
IntRect scrollableAreaBoundingBox(bool* = nullptr) const final;
bool mockScrollbarsControllerEnabled() const final;
void logMockScrollbarsControllerMessage(const String&) const final;
String debugDescription() const final;
void didStartScrollAnimation() final;
// NOTE: This should only be called by the overridden setScrollOffset from ScrollableArea.
void scrollTo(int newOffset);
using PaintFunction = Function<void(PaintInfo&, const LayoutPoint&, int listItemIndex)>;
void paintItem(PaintInfo&, const LayoutPoint&, const PaintFunction&);
void setHasVerticalScrollbar(bool hasScrollbar);
Ref<Scrollbar> createScrollbar();
void destroyScrollbar();
int maximumNumberOfItemsThatFitInPaddingBottomArea() const;
int numberOfVisibleItemsInPaddingTop() const;
int numberOfVisibleItemsInPaddingBottom() const;
void computeFirstIndexesVisibleInPaddingTopBottomAreas();
LayoutUnit itemHeight() const;
enum class ConsiderPadding : bool { No, Yes };
int numVisibleItems(ConsiderPadding = ConsiderPadding::No) const;
int numItems() const;
LayoutUnit listHeight() const;
std::optional<int> optionRowIndex(const HTMLOptionElement&) const;
float deviceScaleFactor() const final;
void paintScrollbar(PaintInfo&, const LayoutPoint&);
void paintItemForeground(PaintInfo&, const LayoutPoint&, int listIndex);
void paintItemBackground(PaintInfo&, const LayoutPoint&, int listIndex);
void scrollToRevealSelection();
bool shouldPlaceVerticalScrollbarOnLeft() const final { return RenderBlockFlow::shouldPlaceVerticalScrollbarOnLeft(); }
bool m_optionsChanged { true };
bool m_scrollToRevealSelectionAfterLayout { false };
bool m_inAutoscroll { false };
int m_optionsWidth { 0 };
RefPtr<Scrollbar> m_vBar;
int m_indexOffset { 0 };
std::optional<int> m_indexOfFirstVisibleItemInsidePaddingTopArea;
std::optional<int> m_indexOfFirstVisibleItemInsidePaddingBottomArea;
};
} // namepace WebCore
SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::RenderListBox)
static bool isType(const WebCore::RenderObject& widget) { return widget.isListBox(); }
static bool isType(const WebCore::ScrollableArea& area) { return area.isListBox(); }
SPECIALIZE_TYPE_TRAITS_END()
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