void PlatformScrollbar::handleMouseMoveEventWhenCapturing(const PlatformMouseEvent& e)
{
IntPoint pos = convertFromContainingWindow(e.pos());
updateMousePosition(pos.x(), pos.y());
if (m_captureStart != Thumb) {
// FIXME: Invalidate only the portions that actually changed
invalidate();
return;
}
int xCancelDistance, yCancelDistance, backgroundSpan, thumbGirth, delta;
// NOTE: The cancel distance calculations are based on the behavior of the
// MSVC8 main window scrollbar + some guessing/extrapolation
if (orientation() == HorizontalScrollbar) {
xCancelDistance = kOffEndMultiplier * horizontalScrollbarHeight();
yCancelDistance = kOffSideMultiplier * horizontalScrollbarHeight();
backgroundSpan = m_segmentRects[AfterThumb].right() -
m_segmentRects[BeforeThumb].x();
thumbGirth = m_segmentRects[Thumb].right() - m_segmentRects[Thumb].x();
delta = pos.x() - m_dragOrigin.thumbPos;
} else {
xCancelDistance = kOffSideMultiplier * verticalScrollbarWidth();
yCancelDistance = kOffEndMultiplier * verticalScrollbarWidth();
backgroundSpan = m_segmentRects[AfterThumb].bottom() -
m_segmentRects[BeforeThumb].y();
thumbGirth = m_segmentRects[Thumb].bottom() - m_segmentRects[Thumb].y();
delta = pos.y() - m_dragOrigin.thumbPos;
}
// Snap scrollbar back to drag origin if mouse gets too far away
if ((m_lastNativePos.x() <
(m_segmentRects[BeforeThumb].x() - xCancelDistance)) ||
(m_lastNativePos.x() >
(m_segmentRects[AfterThumb].right() + xCancelDistance)) ||
(m_lastNativePos.y() <
(m_segmentRects[BeforeThumb].y() - yCancelDistance)) ||
(m_lastNativePos.y() >
(m_segmentRects[AfterThumb].bottom() + yCancelDistance)))
delta = 0;
// Convert delta from pixel coords to scrollbar logical coords
if (backgroundSpan > thumbGirth) {
if (setValue(m_dragOrigin.scrollVal + (delta *
(m_totalSize - m_visibleSize) / (backgroundSpan - thumbGirth)))) {
m_needsLayout = true;
// FIXME: Invalidate only the portions that actually changed
invalidate();
}
}
}
PlatformScrollbar::PlatformScrollbar(ScrollbarClient* client, ScrollbarOrientation orientation, ScrollbarControlSize size)
: Scrollbar(client, orientation, size)
, m_pressedPos(0)
, m_pressedPart(QStyle::SC_None)
, m_hoveredPart(QStyle::SC_None)
, m_scrollTimer(this, &PlatformScrollbar::autoscrollTimerFired)
{
QStyle *s = QApplication::style();
m_opt.state = QStyle::State_Active | QStyle::State_Enabled;
m_opt.sliderValue = m_opt.sliderPosition = 0;
m_opt.upsideDown = false;
setEnabled(true);
if (size != RegularScrollbar)
m_opt.state |= QStyle::State_Mini;
if (orientation == HorizontalScrollbar) {
m_opt.rect.setHeight(horizontalScrollbarHeight(size));
m_opt.orientation = Qt::Horizontal;
m_opt.state |= QStyle::State_Horizontal;
} else {
m_opt.rect.setWidth(verticalScrollbarWidth(size));
m_opt.orientation = Qt::Vertical;
m_opt.state &= ~QStyle::State_Horizontal;
}
}
void PlatformScrollbar::paint(GraphicsContext* graphicsContext, const IntRect& damageRect)
{
if (controlSize() != RegularScrollbar) {
m_opt.state |= QStyle::State_Mini;
} else {
m_opt.state &= ~QStyle::State_Mini;
}
m_opt.orientation = (orientation() == VerticalScrollbar) ? Qt::Vertical : Qt::Horizontal;
QStyle *s = QApplication::style();
if (orientation() == HorizontalScrollbar) {
m_opt.rect.setHeight(horizontalScrollbarHeight(controlSize()));
m_opt.state |= QStyle::State_Horizontal;
} else {
m_opt.rect.setWidth(verticalScrollbarWidth(controlSize()));
m_opt.state &= ~QStyle::State_Horizontal;
}
if (graphicsContext->paintingDisabled() || !m_opt.rect.isValid())
return;
QRect clip = m_opt.rect.intersected(damageRect);
// Don't paint anything if the scrollbar doesn't intersect the damage rect.
if (clip.isEmpty())
return;
QPainter *p = graphicsContext->platformContext();
p->save();
p->setClipRect(clip);
m_opt.sliderValue = value();
m_opt.sliderPosition = value();
m_opt.pageStep = m_visibleSize;
m_opt.singleStep = m_lineStep;
m_opt.minimum = 0;
m_opt.maximum = qMax(0, m_totalSize - m_visibleSize);
if (m_pressedPart != QStyle::SC_None) {
m_opt.activeSubControls = m_pressedPart;
} else {
m_opt.activeSubControls = m_hoveredPart;
}
const QPoint topLeft = m_opt.rect.topLeft();
#ifdef Q_WS_MAC
QApplication::style()->drawComplexControl(QStyle::CC_ScrollBar, &m_opt, p, 0);
#else
p->translate(topLeft);
m_opt.rect.moveTo(QPoint(0, 0));
// The QStyle expects the background to be already filled
p->fillRect(m_opt.rect, m_opt.palette.background());
QApplication::style()->drawComplexControl(QStyle::CC_ScrollBar, &m_opt, p, 0);
m_opt.rect.moveTo(topLeft);
#endif
p->restore();
}
void PlatformScrollbar::layout()
{
#if PLATFORM(WIN_OS)
if (!m_needsLayout)
return;
m_needsLayout = false;
const IntRect invalid(-1, -1, 0, 0);
if (m_totalSize <= 0) {
for (int i = 0; i < NumSegments; ++i)
m_segmentRects[i] = invalid;
return;
}
int buttonGirth, backgroundSpan, thumbGirth;
RECT box = {0};
LONG* changingCoord1, * changingCoord2;
// For both orientations, we allow the buttonGirth to determine the
// backgroundSpan directly, to avoid rounding errors.
if (orientation() == HorizontalScrollbar) {
buttonGirth = scrollButtonGirth(SM_CXHSCROLL, width(), &backgroundSpan);
thumbGirth = scrollThumbGirth(SM_CXHTHUMB, backgroundSpan);
box.bottom += horizontalScrollbarHeight();
changingCoord1 = &box.left;
changingCoord2 = &box.right;
} else {
buttonGirth = scrollButtonGirth(SM_CYVSCROLL, height(),
&backgroundSpan);
thumbGirth = scrollThumbGirth(SM_CYVTHUMB, backgroundSpan);
box.right += verticalScrollbarWidth();
changingCoord1 = &box.top;
changingCoord2 = &box.bottom;
}
// Scrollbar: |<|--------|XXX|------|>|
// Start arrow: |<|
*changingCoord2 += buttonGirth;
m_segmentRects[Arrow1] = gfx::RECTToSkIRect(box);
if (thumbGirth >= backgroundSpan) {
if (backgroundSpan == 0) {
m_segmentRects[Track] = invalid;
} else {
// Track: |-------------------|
*changingCoord1 = *changingCoord2;
*changingCoord2 += backgroundSpan;
m_segmentRects[Track] = gfx::RECTToSkIRect(box);
}
m_segmentRects[BeforeThumb] = invalid;
m_segmentRects[Thumb] = invalid;
m_segmentRects[AfterThumb] = invalid;
} else {
m_segmentRects[Track] = invalid;
const int thumbOffset = (m_totalSize <= m_visibleSize) ? 0 : (value() *
(backgroundSpan - thumbGirth) / (m_totalSize - m_visibleSize));
// Before thumb: |--------|
*changingCoord1 = *changingCoord2;
*changingCoord2 += thumbOffset;
m_segmentRects[BeforeThumb] = gfx::RECTToSkIRect(box);
// Thumb: |XXX|
*changingCoord1 = *changingCoord2;
*changingCoord2 += thumbGirth;
m_segmentRects[Thumb] = gfx::RECTToSkIRect(box);
// After thumb: |------|
*changingCoord1 = *changingCoord2;
*changingCoord2 += backgroundSpan - (thumbOffset + thumbGirth);
m_segmentRects[AfterThumb] = gfx::RECTToSkIRect(box);
}
// End arrow: |>|
*changingCoord1 = *changingCoord2;
*changingCoord2 += buttonGirth;
m_segmentRects[Arrow2] = gfx::RECTToSkIRect(box);
// Changed layout, so need to update m_mouseOver and m_autorepeatTimer
updateMousePositionInternal();
// DO NOT invalidate() here. We already invalidate()d for this layout when
// setting m_needsLayout = true; by the time we reach this point, we're
// called by paint(), so invalidate() is not only unnecessary but will
// waste effort.
#endif
}
int PlatformScrollbar::width() const
{
return orientation() == VerticalScrollbar ?
verticalScrollbarWidth(controlSize()) : Widget::width();
}