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/*
* Copyright (C) 2004, 2006 Apple Computer, 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 COMPUTER, 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 COMPUTER, 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 Scrollbar_h
#define Scrollbar_h
#include <wtf/RefCounted.h>
#include "ScrollTypes.h"
#include "Timer.h"
#include "Widget.h"
#include <wtf/MathExtras.h>
#include <wtf/PassRefPtr.h>
namespace WebCore {
class GraphicsContext;
class IntRect;
class ScrollbarClient;
class ScrollbarTheme;
class PlatformMouseEvent;
// These match the numbers we use over in WebKit (WebFrameView.m).
const int cScrollbarPixelsPerLineStep = 40;
const int cAmountToKeepWhenPaging = 40;
class Scrollbar : public Widget, public RefCounted<Scrollbar> {
protected:
Scrollbar(ScrollbarClient*, ScrollbarOrientation, ScrollbarControlSize, ScrollbarTheme* = 0);
public:
virtual ~Scrollbar();
// Must be implemented by platforms that can't simply use the Scrollbar base class. Right now the only platform that is not using the base class is GTK.
static PassRefPtr<Scrollbar> createNativeScrollbar(ScrollbarClient* client, ScrollbarOrientation orientation, ScrollbarControlSize size);
void setClient(ScrollbarClient* client) { m_client = client; }
ScrollbarClient* client() const { return m_client; }
ScrollbarOrientation orientation() const { return m_orientation; }
int value() const { return lroundf(m_currentPos); }
float currentPos() const { return m_currentPos; }
int pressedPos() const { return m_pressedPos; }
int visibleSize() const { return m_visibleSize; }
int totalSize() const { return m_totalSize; }
int maximum() const { return m_totalSize - m_visibleSize; }
ScrollbarControlSize controlSize() const { return m_controlSize; }
int lineStep() const { return m_lineStep; }
int pageStep() const { return m_pageStep; }
float pixelStep() const { return m_pixelStep; }
ScrollbarPart pressedPart() const { return m_pressedPart; }
ScrollbarPart hoveredPart() const { return m_hoveredPart; }
virtual void setHoveredPart(ScrollbarPart);
virtual void setPressedPart(ScrollbarPart);
void setSteps(int lineStep, int pageStep, int pixelsPerStep = 1);
bool setValue(int);
void setProportion(int visibleSize, int totalSize);
void setPressedPos(int p) { m_pressedPos = p; }
bool scroll(ScrollDirection, ScrollGranularity, float multiplier = 1.0f);
virtual void paint(GraphicsContext*, const IntRect& damageRect);
bool enabled() const { return m_enabled; }
virtual void setEnabled(bool e);
bool isWindowActive() const;
// These methods are used for platform scrollbars to give :hover feedback. They will not get called
// when the mouse went down in a scrollbar, since it is assumed the scrollbar will start
// grabbing all events in that case anyway.
bool mouseMoved(const PlatformMouseEvent&);
bool mouseExited();
// Used by some platform scrollbars to know when they've been released from capture.
bool mouseUp();
bool mouseDown(const PlatformMouseEvent&);
#if PLATFORM(QT)
// For platforms that wish to handle context menu events.
// FIXME: This is misplaced. Normal hit testing should be used to populate a correct
// context menu. There's no reason why the scrollbar should have to do it.
bool contextMenu(const PlatformMouseEvent& event);
#endif
// Takes an event and accounts for any transforms that might occur on the scrollbar. Returns
// a new event that has had all of the transforms applied.
PlatformMouseEvent transformEvent(const PlatformMouseEvent&);
ScrollbarTheme* theme() const { return m_theme; }
virtual void setParent(ScrollView*);
virtual void setFrameRect(const IntRect&);
virtual void invalidateRect(const IntRect&);
bool suppressInvalidation() const { return m_suppressInvalidation; }
void setSuppressInvalidation(bool s) { m_suppressInvalidation = s; }
virtual void styleChanged() { }
protected:
virtual void updateThumbPosition();
virtual void updateThumbProportion();
void autoscrollTimerFired(Timer<Scrollbar>*);
void startTimerIfNeeded(double delay);
void stopTimerIfNeeded();
void autoscrollPressedPart(double delay);
ScrollDirection pressedPartScrollDirection();
ScrollGranularity pressedPartScrollGranularity();
void moveThumb(int pos);
ScrollbarClient* m_client;
ScrollbarOrientation m_orientation;
ScrollbarControlSize m_controlSize;
ScrollbarTheme* m_theme;
int m_visibleSize;
int m_totalSize;
float m_currentPos;
int m_lineStep;
int m_pageStep;
float m_pixelStep;
ScrollbarPart m_hoveredPart;
ScrollbarPart m_pressedPart;
int m_pressedPos;
bool m_enabled;
Timer<Scrollbar> m_scrollTimer;
bool m_overlapsResizer;
bool m_suppressInvalidation;
};
}
#endif
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