125 lines
5.4 KiB
C++
125 lines
5.4 KiB
C++
/*
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* Copyright (C) 2008 Apple Inc. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef ScrollbarTheme_h
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#define ScrollbarTheme_h
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#include "GraphicsContext.h"
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#include "IntRect.h"
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#include "ScrollTypes.h"
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namespace WebCore {
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class PlatformMouseEvent;
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class ScrollableArea;
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class Scrollbar;
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class ScrollView;
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#if ENABLE(RUBBER_BANDING)
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class GraphicsLayer;
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#endif
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class ScrollbarTheme {
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WTF_MAKE_NONCOPYABLE(ScrollbarTheme); WTF_MAKE_FAST_ALLOCATED;
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public:
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ScrollbarTheme() = default;
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virtual ~ScrollbarTheme() {};
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virtual void updateEnabledState(Scrollbar&) { }
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virtual bool paint(Scrollbar&, GraphicsContext&, const IntRect& /*damageRect*/) { return false; }
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virtual ScrollbarPart hitTest(Scrollbar&, const IntPoint&) { return NoPart; }
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virtual int scrollbarThickness(ScrollbarControlSize = ScrollbarControlSize::Regular, ScrollbarExpansionState = ScrollbarExpansionState::Expanded) { return 0; }
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virtual ScrollbarButtonsPlacement buttonsPlacement() const { return ScrollbarButtonsSingle; }
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virtual bool supportsControlTints() const { return false; }
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virtual bool usesOverlayScrollbars() const { return false; }
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virtual void usesOverlayScrollbarsChanged() { }
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virtual void updateScrollbarOverlayStyle(Scrollbar&) { }
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virtual void themeChanged() {}
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virtual bool invalidateOnMouseEnterExit() { return false; }
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void invalidateParts(Scrollbar& scrollbar, ScrollbarControlPartMask mask)
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{
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if (mask & BackButtonStartPart)
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invalidatePart(scrollbar, BackButtonStartPart);
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if (mask & ForwardButtonStartPart)
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invalidatePart(scrollbar, ForwardButtonStartPart);
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if (mask & BackTrackPart)
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invalidatePart(scrollbar, BackTrackPart);
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if (mask & ThumbPart)
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invalidatePart(scrollbar, ThumbPart);
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if (mask & ForwardTrackPart)
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invalidatePart(scrollbar, ForwardTrackPart);
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if (mask & BackButtonEndPart)
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invalidatePart(scrollbar, BackButtonEndPart);
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if (mask & ForwardButtonEndPart)
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invalidatePart(scrollbar, ForwardButtonEndPart);
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}
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virtual void invalidatePart(Scrollbar&, ScrollbarPart) { }
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virtual void paintScrollCorner(ScrollableArea& area, GraphicsContext& context, const IntRect& cornerRect) { defaultPaintScrollCorner(area, context, cornerRect); }
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static void defaultPaintScrollCorner(ScrollableArea&, GraphicsContext& context, const IntRect& cornerRect) { context.fillRect(cornerRect, Color::white); }
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virtual void paintTickmarks(GraphicsContext&, Scrollbar&, const IntRect&) { }
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virtual void paintOverhangAreas(ScrollView&, GraphicsContext&, const IntRect&, const IntRect&, const IntRect&) { }
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#if ENABLE(RUBBER_BANDING)
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virtual void setUpOverhangAreasLayerContents(GraphicsLayer*, const Color&) { }
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virtual void setUpContentShadowLayer(GraphicsLayer*) { }
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#endif
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virtual ScrollbarButtonPressAction handleMousePressEvent(Scrollbar&, const PlatformMouseEvent&, ScrollbarPart);
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virtual bool shouldSnapBackToDragOrigin(Scrollbar&, const PlatformMouseEvent&) { return false; }
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virtual bool shouldDragDocumentInsteadOfThumb(Scrollbar&, const PlatformMouseEvent&) { return false; }
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virtual int thumbPosition(Scrollbar&) { return 0; } // The position of the thumb relative to the track.
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virtual int thumbLength(Scrollbar&) { return 0; } // The length of the thumb along the axis of the scrollbar.
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virtual int trackPosition(Scrollbar&) { return 0; } // The position of the track relative to the scrollbar.
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virtual int trackLength(Scrollbar&) { return 0; } // The length of the track along the axis of the scrollbar.
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virtual int maxOverlapBetweenPages() { return std::numeric_limits<int>::max(); }
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virtual Seconds initialAutoscrollTimerDelay() { return 250_ms; }
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virtual Seconds autoscrollTimerDelay() { return 50_ms; }
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virtual void registerScrollbar(Scrollbar&) { }
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virtual void unregisterScrollbar(Scrollbar&) { }
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virtual bool isMockTheme() const { return false; }
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WEBCORE_EXPORT static ScrollbarTheme& theme();
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private:
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static ScrollbarTheme& nativeTheme(); // Must be implemented to return the correct theme subclass.
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};
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}
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#endif
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