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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"
#include "platform/scroll/Scrollbar.h"
#include "public/platform/WebScrollbarButtonsPlacement.h"
namespace blink {
class CullRect;
class GraphicsContext;
class PlatformMouseEvent;
class PLATFORM_EXPORT ScrollbarTheme {
WTF_MAKE_NONCOPYABLE(ScrollbarTheme);
USING_FAST_MALLOC(ScrollbarTheme);
public:
ScrollbarTheme() {}
virtual ~ScrollbarTheme() {}
// If true, then scrollbars with this theme will be painted every time
// Scrollbar::setNeedsPaintInvalidation is called. If false, then only parts
// which are explicitly invalidated will be repainted.
virtual bool shouldRepaintAllPartsOnInvalidation() const { return true; }
virtual void updateEnabledState(const ScrollbarThemeClient&) {}
virtual bool paint(const Scrollbar&, GraphicsContext&, const CullRect&);
virtual ScrollbarPart hitTest(const ScrollbarThemeClient&, const IntPoint&);
// This returns a fixed value regardless of device-scale-factor.
// This returns thickness when scrollbar is painted. i.e. It's not 0 even in
// overlay scrollbar mode.
// See also Scrollbar::scrollbarThickness().
virtual int scrollbarThickness(ScrollbarControlSize = RegularScrollbar) {
return 0;
}
virtual int scrollbarMargin() const { return 0; }
virtual WebScrollbarButtonsPlacement buttonsPlacement() const {
return WebScrollbarButtonsPlacementSingle;
}
virtual bool supportsControlTints() const { return false; }
virtual bool usesOverlayScrollbars() const { return false; }
virtual void updateScrollbarOverlayColorTheme(const ScrollbarThemeClient&) {}
// If true, scrollbars that become invisible (i.e. overlay scrollbars that
// fade out) should be marked as disabled. This option exists since Mac and
// Aura overlays implement the fade out differently, with Mac painting code
// fading out the scrollbars. Aura scrollbars require disabling the scrollbar
// to prevent painting it.
virtual bool shouldDisableInvisibleScrollbars() const { return true; }
virtual bool invalidateOnMouseEnterExit() { return false; }
virtual bool invalidateOnWindowActiveChange() const { return false; }
// Returns parts of the scrollbar which must be repainted following a change
// in the thumb position, given scroll positions before and after.
virtual ScrollbarPart invalidateOnThumbPositionChange(
const ScrollbarThemeClient&,
float oldPosition,
float newPosition) const {
return AllParts;
}
// Returns parts of the scrollbar which must be repainted following a change
// in enabled state.
virtual ScrollbarPart invalidateOnEnabledChange() const { return AllParts; }
virtual void paintScrollCorner(GraphicsContext&,
const DisplayItemClient&,
const IntRect& cornerRect);
virtual void paintTickmarks(GraphicsContext&,
const Scrollbar&,
const IntRect&);
virtual bool shouldCenterOnThumb(const ScrollbarThemeClient&,
const PlatformMouseEvent&);
virtual bool shouldSnapBackToDragOrigin(const ScrollbarThemeClient&,
const PlatformMouseEvent&);
virtual bool shouldDragDocumentInsteadOfThumb(const ScrollbarThemeClient&,
const PlatformMouseEvent&) {
return false;
}
// The position of the thumb relative to the track.
int thumbPosition(const ScrollbarThemeClient& scrollbar) {
return thumbPosition(scrollbar, scrollbar.currentPos());
}
virtual double overlayScrollbarFadeOutDelaySeconds() const;
virtual double overlayScrollbarFadeOutDurationSeconds() const;
// The position the thumb would have, relative to the track, at the specified
// scroll position.
virtual int thumbPosition(const ScrollbarThemeClient&, float scrollPosition);
// The length of the thumb along the axis of the scrollbar.
virtual int thumbLength(const ScrollbarThemeClient&);
// The position of the track relative to the scrollbar.
virtual int trackPosition(const ScrollbarThemeClient&);
// The length of the track along the axis of the scrollbar.
virtual int trackLength(const ScrollbarThemeClient&);
// The opacity to be applied to the thumb.
virtual float thumbOpacity(const ScrollbarThemeClient&) const { return 1.0f; }
virtual bool hasButtons(const ScrollbarThemeClient&) = 0;
virtual bool hasThumb(const ScrollbarThemeClient&) = 0;
virtual IntRect backButtonRect(const ScrollbarThemeClient&,
ScrollbarPart,
bool painting = false) = 0;
virtual IntRect forwardButtonRect(const ScrollbarThemeClient&,
ScrollbarPart,
bool painting = false) = 0;
virtual IntRect trackRect(const ScrollbarThemeClient&,
bool painting = false) = 0;
virtual IntRect thumbRect(const ScrollbarThemeClient&);
virtual int thumbThickness(const ScrollbarThemeClient&);
virtual int minimumThumbLength(const ScrollbarThemeClient&);
virtual void splitTrack(const ScrollbarThemeClient&,
const IntRect& track,
IntRect& startTrack,
IntRect& thumb,
IntRect& endTrack);
virtual void paintScrollbarBackground(GraphicsContext&, const Scrollbar&) {}
virtual void paintTrackBackground(GraphicsContext&,
const Scrollbar&,
const IntRect&) {}
virtual void paintTrackPiece(GraphicsContext&,
const Scrollbar&,
const IntRect&,
ScrollbarPart) {}
virtual void paintButton(GraphicsContext&,
const Scrollbar&,
const IntRect&,
ScrollbarPart) {}
virtual void paintThumb(GraphicsContext&, const Scrollbar&, 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(const 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();
protected:
virtual int tickmarkBorderWidth() { return 0; }
static DisplayItem::Type buttonPartToDisplayItemType(ScrollbarPart);
static DisplayItem::Type trackPiecePartToDisplayItemType(ScrollbarPart);
private:
static ScrollbarTheme&
nativeTheme(); // Must be implemented to return the correct theme subclass.
static bool gMockScrollbarsEnabled;
};
} // namespace blink
#endif
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