/*
* 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.
*/
#include "config.h"
#include "ScrollBar.h"
#include <algorithm>
using std::max;
using std::min;
namespace WebCore {
Scrollbar::Scrollbar(ScrollbarClient* client, ScrollbarOrientation orientation, ScrollbarControlSize controlSize)
: m_client(client)
, m_orientation(orientation)
, m_controlSize(controlSize)
, m_visibleSize(0)
, m_totalSize(0)
, m_currentPos(0)
, m_lineStep(0)
, m_pageStep(0)
, m_pixelStep(1)
{
}
bool Scrollbar::setValue(int v)
{
v = max(min(v, m_totalSize - m_visibleSize), 0);
if (value() == v)
return false; // Our value stayed the same.
m_currentPos = v;
updateThumbPosition();
if (client())
client()->valueChanged(this);
return true;
}
void Scrollbar::setProportion(int visibleSize, int totalSize)
{
if (visibleSize == m_visibleSize && totalSize == m_totalSize)
return;
m_visibleSize = visibleSize;
m_totalSize = totalSize;
updateThumbProportion();
}
void Scrollbar::setSteps(int lineStep, int pageStep, int pixelsPerStep)
{
m_lineStep = lineStep;
m_pageStep = pageStep;
m_pixelStep = 1.0f / pixelsPerStep;
}
bool Scrollbar::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier)
{
float step = 0;
if ((direction == ScrollUp && m_orientation == VerticalScrollbar) || (direction == ScrollLeft && m_orientation == HorizontalScrollbar))
step = -1;
else if ((direction == ScrollDown && m_orientation == VerticalScrollbar) || (direction == ScrollRight && m_orientation == HorizontalScrollbar))
step = 1;
if (granularity == ScrollByLine)
step *= m_lineStep;
else if (granularity == ScrollByPage)
step *= m_pageStep;
else if (granularity == ScrollByDocument)
step *= m_totalSize;
else if (granularity == ScrollByPixel)
step *= m_pixelStep;
float newPos = m_currentPos + step * multiplier;
float maxPos = m_totalSize - m_visibleSize;
newPos = max(min(newPos, maxPos), 0.0f);
if (newPos == m_currentPos)
return false;
int oldValue = value();
m_currentPos = newPos;
updateThumbPosition();
if (value() != oldValue && client())
client()->valueChanged(this);
// return true even if the integer value did not change so that scroll event gets eaten
return true;
}
}