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/*
* 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 ScrollbarTheme_h
#define ScrollbarTheme_h
#include "platform/PlatformExport.h"
#include "platform/geometry/IntRect.h"
#include "platform/graphics/paint/DisplayItem.h"
#include "platform/scroll/ScrollTypes.h"
namespace blink {
class GraphicsContext;
class PlatformMouseEvent;
class ScrollbarThemeClient;
class PLATFORM_EXPORT ScrollbarTheme {
WTF_MAKE_NONCOPYABLE(ScrollbarTheme); WTF_MAKE_FAST_ALLOCATED;
public:
ScrollbarTheme() { }
virtual ~ScrollbarTheme() { }
virtual void updateEnabledState(ScrollbarThemeClient*) { }
virtual bool paint(ScrollbarThemeClient*, GraphicsContext*, const IntRect& damageRect);
virtual ScrollbarPart hitTest(ScrollbarThemeClient*, const IntPoint&);
virtual int scrollbarThickness(ScrollbarControlSize = RegularScrollbar) { return 0; }
virtual int scrollbarMargin() const { return 0; }
virtual ScrollbarButtonsPlacement buttonsPlacement() const { return ScrollbarButtonsSingle; }
virtual bool supportsControlTints() const { return false; }
virtual bool usesOverlayScrollbars() const { return false; }
virtual void updateScrollbarOverlayStyle(ScrollbarThemeClient*) { }
virtual bool invalidateOnMouseEnterExit() { return false; }
void invalidateParts(ScrollbarThemeClient* scrollbar, ScrollbarControlPartMask mask)
{
if (mask & BackButtonStartPart)
invalidatePart(scrollbar, BackButtonStartPart);
if (mask & ForwardButtonStartPart)
invalidatePart(scrollbar, ForwardButtonStartPart);
if (mask & BackTrackPart)
invalidatePart(scrollbar, BackTrackPart);
if (mask & ThumbPart)
invalidatePart(scrollbar, ThumbPart);
if (mask & ForwardTrackPart)
invalidatePart(scrollbar, ForwardTrackPart);
if (mask & BackButtonEndPart)
invalidatePart(scrollbar, BackButtonEndPart);
if (mask & ForwardButtonEndPart)
invalidatePart(scrollbar, ForwardButtonEndPart);
}
virtual void invalidatePart(ScrollbarThemeClient*, ScrollbarPart);
virtual void paintScrollCorner(GraphicsContext*, const IntRect& cornerRect);
virtual void paintTickmarks(GraphicsContext*, ScrollbarThemeClient*, const IntRect&) { }
virtual void paintOverhangBackground(GraphicsContext*, const IntRect&, const IntRect&, const IntRect&);
virtual void paintOverhangShadows(GraphicsContext*, const IntSize&, const IntRect&, const IntRect&, const IntRect&) { }
virtual bool shouldCenterOnThumb(ScrollbarThemeClient*, const PlatformMouseEvent&);
virtual bool shouldSnapBackToDragOrigin(ScrollbarThemeClient*, const PlatformMouseEvent&);
virtual bool shouldDragDocumentInsteadOfThumb(ScrollbarThemeClient*, const PlatformMouseEvent&) { return false; }
// The position of the thumb relative to the track.
virtual int thumbPosition(ScrollbarThemeClient*);
// The length of the thumb along the axis of the scrollbar.
virtual int thumbLength(ScrollbarThemeClient*);
// The position of the track relative to the scrollbar.
virtual int trackPosition(ScrollbarThemeClient*);
// The length of the track along the axis of the scrollbar.
virtual int trackLength(ScrollbarThemeClient*);
virtual bool hasButtons(ScrollbarThemeClient*) = 0;
virtual bool hasThumb(ScrollbarThemeClient*) = 0;
virtual IntRect backButtonRect(ScrollbarThemeClient*, ScrollbarPart, bool painting = false) = 0;
virtual IntRect forwardButtonRect(ScrollbarThemeClient*, ScrollbarPart, bool painting = false) = 0;
virtual IntRect trackRect(ScrollbarThemeClient*, bool painting = false) = 0;
virtual IntRect thumbRect(ScrollbarThemeClient*);
virtual int thumbThickness(ScrollbarThemeClient*);
virtual int minimumThumbLength(ScrollbarThemeClient*);
virtual void splitTrack(ScrollbarThemeClient*, const IntRect& track, IntRect& startTrack, IntRect& thumb, IntRect& endTrack);
virtual void paintScrollbarBackground(GraphicsContext*, ScrollbarThemeClient*) { }
virtual void paintTrackBackground(GraphicsContext*, ScrollbarThemeClient*, const IntRect&) { }
virtual void paintTrackPiece(GraphicsContext*, ScrollbarThemeClient*, const IntRect&, ScrollbarPart) { }
virtual void paintButton(GraphicsContext*, ScrollbarThemeClient*, const IntRect&, ScrollbarPart) { }
virtual void paintThumb(GraphicsContext*, ScrollbarThemeClient*, const IntRect&) { }
virtual int maxOverlapBetweenPages() { return std::numeric_limits<int>::max(); }
virtual double initialAutoscrollTimerDelay() { return 0.25; }
virtual double autoscrollTimerDelay() { return 0.05; }
virtual IntRect constrainTrackRectToTrackPieces(ScrollbarThemeClient*, const IntRect& rect) { return rect; }
virtual void registerScrollbar(ScrollbarThemeClient*) { }
virtual void unregisterScrollbar(ScrollbarThemeClient*) { }
virtual bool isMockTheme() const { return false; }
static ScrollbarTheme* theme();
static void setMockScrollbarsEnabled(bool flag);
static bool mockScrollbarsEnabled();
DisplayItemClient displayItemClient() const { return static_cast<DisplayItemClientInternalVoid*>((void*)this); }
protected:
bool paintInternal(ScrollbarThemeClient*, GraphicsContext*, const IntRect& damageRect);
private:
static ScrollbarTheme* nativeTheme(); // Must be implemented to return the correct theme subclass.
static bool gMockScrollbarsEnabled;
};
}
#endif
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