void Scrollbar::moveThumb(int pos)
{
if (!m_scrollableArea)
return;
int delta = pos - m_pressedPos;
// Drag the thumb.
int thumbPos = thumbPosition();
int thumbLen = thumbLength();
int trackLen = trackLength();
if (delta > 0)
delta = std::min(trackLen - thumbLen - thumbPos, delta);
else if (delta < 0)
delta = std::max(-thumbPos, delta);
float minPos = m_scrollableArea->minimumScrollPosition(m_orientation);
float maxPos = m_scrollableArea->maximumScrollPosition(m_orientation);
if (delta) {
float newPosition = static_cast<float>(thumbPos + delta) * (maxPos - minPos) / (trackLen - thumbLen) + minPos;
m_scrollableArea->scrollToOffsetWithoutAnimation(m_orientation, newPosition);
}
}
int ScrollbarThemeQt::thumbPosition(Scrollbar* scrollbar)
{
if (scrollbar->enabled())
return (int)((float)scrollbar->currentPos() * (trackLength(scrollbar) - thumbLength(scrollbar)) / scrollbar->maximum());
return 0;
}
bool PlatformScrollbar::handleMouseMoveEvent(const PlatformMouseEvent& evt)
{
const QPoint pos = convertFromContainingWindow(evt.pos());
//qDebug() << "PlatformScrollbar::handleMouseMoveEvent" << m_opt.rect << pos << evt.pos();
m_opt.state |= QStyle::State_MouseOver;
const QPoint topLeft = m_opt.rect.topLeft();
m_opt.rect.moveTo(QPoint(0, 0));
QStyle::SubControl sc = QApplication::style()->hitTestComplexControl(QStyle::CC_ScrollBar, &m_opt, pos, 0);
m_opt.rect.moveTo(topLeft);
if (m_pressedPart == QStyle::SC_ScrollBarSlider) {
// Drag the thumb.
int thumbPos = thumbPosition();
int thumbLen = thumbLength();
int trackLen = trackLength();
int maxPos = trackLen - thumbLen;
int delta = 0;
if (m_orientation == HorizontalScrollbar)
delta = pos.x() - m_pressedPos;
else
delta = pos.y() - m_pressedPos;
if (delta > 0)
// The mouse moved down/right.
delta = min(maxPos - thumbPos, delta);
else if (delta < 0)
// The mouse moved up/left.
delta = max(-thumbPos, delta);
if (delta != 0) {
setValue((int)((float)(thumbPos + delta) * (m_totalSize - m_visibleSize) / (trackLen - thumbLen)));
m_pressedPos += thumbPosition() - thumbPos;
}
return true;
}
if (m_pressedPart != QStyle::SC_None)
m_pressedPos = m_orientation == HorizontalScrollbar ? pos.x() : pos.y();
if (sc != m_hoveredPart) {
if (m_pressedPart != QStyle::SC_None) {
if (sc == m_pressedPart) {
// The mouse is moving back over the pressed part. We
// need to start up the timer action again.
startTimerIfNeeded(cNormalTimerDelay);
invalidate();
} else if (m_hoveredPart == m_pressedPart) {
// The mouse is leaving the pressed part. Kill our timer
// if needed.
stopTimerIfNeeded();
invalidate();
}
} else {
invalidate();
}
m_hoveredPart = sc;
}
return true;
}
int PlatformScrollbar::thumbPosition() const
{
if (isEnabled())
return (int)((float)m_currentPos * (trackLength() - thumbLength()) / (m_totalSize - m_visibleSize));
return 0;
}
int ScrollbarThemeComposite::thumbPosition(Scrollbar* scrollbar)
{
if (scrollbar->enabled())
return scrollbar->currentPos() * (trackLength(scrollbar) - thumbLength(scrollbar)) / scrollbar->maximum();
return 0;
}
