/*
* The following is assumed:
* (hadj && vadj) || (!hadj && !vadj)
*/
void ScrollView::setGtkAdjustments(GtkAdjustment* hadj, GtkAdjustment* vadj)
{
ASSERT(!hadj == !vadj);
if (m_horizontalAdjustment) {
g_signal_handlers_disconnect_by_func(G_OBJECT(m_horizontalAdjustment), (gpointer)adjustmentChanged, this);
g_signal_handlers_disconnect_by_func(G_OBJECT(m_verticalAdjustment), (gpointer)adjustmentChanged, this);
g_object_unref(m_horizontalAdjustment);
g_object_unref(m_verticalAdjustment);
}
m_horizontalAdjustment = hadj;
m_verticalAdjustment = vadj;
if (m_horizontalAdjustment) {
g_signal_connect(m_horizontalAdjustment, "value-changed", G_CALLBACK(adjustmentChanged), this);
g_signal_connect(m_verticalAdjustment, "value-changed", G_CALLBACK(adjustmentChanged), this);
/*
* disable the scrollbars (if we have any) as the GtkAdjustment over
*/
setHasVerticalScrollbar(false);
setHasHorizontalScrollbar(false);
g_object_ref(m_horizontalAdjustment);
g_object_ref(m_verticalAdjustment);
}
updateScrollbars(m_scrollOffset);
}
void RenderLayerScrollableArea::updateAfterStyleChange(const RenderStyle* oldStyle)
{
if (!canHaveOverflowScrollbars(box()))
return;
if (!m_scrollDimensionsDirty)
updateScrollableAreaSet(hasScrollableHorizontalOverflow() || hasScrollableVerticalOverflow());
EOverflow overflowX = box().style()->overflowX();
EOverflow overflowY = box().style()->overflowY();
// To avoid doing a relayout in updateScrollbarsAfterLayout, we try to keep any automatic scrollbar that was already present.
bool needsHorizontalScrollbar = (hasHorizontalScrollbar() && overflowDefinesAutomaticScrollbar(overflowX)) || overflowRequiresScrollbar(overflowX);
bool needsVerticalScrollbar = (hasVerticalScrollbar() && overflowDefinesAutomaticScrollbar(overflowY)) || overflowRequiresScrollbar(overflowY);
setHasHorizontalScrollbar(needsHorizontalScrollbar);
setHasVerticalScrollbar(needsVerticalScrollbar);
// With overflow: scroll, scrollbars are always visible but may be disabled.
// When switching to another value, we need to re-enable them (see bug 11985).
if (needsHorizontalScrollbar && oldStyle && oldStyle->overflowX() == OSCROLL && overflowX != OSCROLL) {
ASSERT(hasHorizontalScrollbar());
m_hBar->setEnabled(true);
}
if (needsVerticalScrollbar && oldStyle && oldStyle->overflowY() == OSCROLL && overflowY != OSCROLL) {
ASSERT(hasVerticalScrollbar());
m_vBar->setEnabled(true);
}
}
/*
* The following is assumed:
* (hadj && vadj) || (!hadj && !vadj)
*/
void ScrollView::setGtkAdjustments(GtkAdjustment* hadj, GtkAdjustment* vadj, bool resetValues)
{
ASSERT(!hadj == !vadj);
m_horizontalAdjustment = hadj;
m_verticalAdjustment = vadj;
// Reset the adjustments to a sane default
if (m_horizontalAdjustment) {
ScrollbarGtk* hScrollbar = reinterpret_cast<ScrollbarGtk*>(horizontalScrollbar());
if (hScrollbar)
hScrollbar->attachAdjustment(m_horizontalAdjustment);
ScrollbarGtk* vScrollbar = reinterpret_cast<ScrollbarGtk*>(verticalScrollbar());
if (vScrollbar)
vScrollbar->attachAdjustment(m_verticalAdjustment);
// We used to reset everything to 0 here, but when page cache
// is enabled we reuse FrameViews that are cached. Since their
// size is not going to change when being restored, (which is
// what would cause the upper limit in the adjusments to be
// set in the normal case), we make sure they are up-to-date
// here. This is needed for the parent scrolling widget to be
// able to report correct values.
m_horizontalAdjustment->lower = 0;
m_horizontalAdjustment->upper = resetValues ? 0 : frameRect().width();
m_horizontalAdjustment->value = resetValues ? 0 : scrollOffset().width();
gtk_adjustment_changed(m_horizontalAdjustment);
gtk_adjustment_value_changed(m_horizontalAdjustment);
m_verticalAdjustment->lower = 0;
m_verticalAdjustment->upper = resetValues ? 0 : frameRect().height();
m_verticalAdjustment->value = resetValues ? 0 : scrollOffset().height();
gtk_adjustment_changed(m_verticalAdjustment);
gtk_adjustment_value_changed(m_verticalAdjustment);
} else {
ScrollbarGtk* hScrollbar = reinterpret_cast<ScrollbarGtk*>(horizontalScrollbar());
if (hScrollbar)
hScrollbar->detachAdjustment();
ScrollbarGtk* vScrollbar = reinterpret_cast<ScrollbarGtk*>(verticalScrollbar());
if (vScrollbar)
vScrollbar->detachAdjustment();
}
/* reconsider having a scrollbar */
setHasVerticalScrollbar(false);
setHasHorizontalScrollbar(false);
}
void ScrollView::setHorizontalAdjustment(GtkAdjustment* hadj, bool resetValues)
{
ASSERT(!parent() || !hadj);
if (parent())
return;
m_horizontalAdjustment = hadj;
if (!m_horizontalAdjustment) {
MainFrameScrollbarGtk* hScrollbar = reinterpret_cast<MainFrameScrollbarGtk*>(horizontalScrollbar());
if (hScrollbar)
hScrollbar->detachAdjustment();
return;
}
// We may be lacking scrollbars when returning to a cached
// page, this kicks the page to recreate the scrollbars.
setHasHorizontalScrollbar(true);
MainFrameScrollbarGtk* hScrollbar = reinterpret_cast<MainFrameScrollbarGtk*>(horizontalScrollbar());
hScrollbar->attachAdjustment(m_horizontalAdjustment.get());
// We used to reset everything to 0 here, but when page cache
// is enabled we reuse FrameViews that are cached. Since their
// size is not going to change when being restored, (which is
// what would cause the upper limit in the adjusments to be
// set in the normal case), we make sure they are up-to-date
// here. This is needed for the parent scrolling widget to be
// able to report correct values.
int horizontalPageStep = max(max<int>(frameRect().width() * Scrollbar::minFractionToStepWhenPaging(), frameRect().width() - Scrollbar::maxOverlapBetweenPages()), 1);
gtk_adjustment_configure(m_horizontalAdjustment.get(),
resetValues ? 0 : scrollOffset().width(), 0,
resetValues ? 0 : contentsSize().width(),
resetValues ? 0 : Scrollbar::pixelsPerLineStep(),
resetValues ? 0 : horizontalPageStep,
resetValues ? 0 : frameRect().width());
}
FramelessScrollView::~FramelessScrollView()
{
// Remove native scrollbars now before we lose the connection to the HostWindow.
setHasHorizontalScrollbar(false);
setHasVerticalScrollbar(false);
}
void RenderLayerScrollableArea::updateAfterLayout()
{
m_scrollDimensionsDirty = true;
IntSize originalScrollOffset = adjustedScrollOffset();
computeScrollDimensions();
// Layout may cause us to be at an invalid scroll position. In this case we need
// to pull our scroll offsets back to the max (or push them up to the min).
IntSize clampedScrollOffset = clampScrollOffset(adjustedScrollOffset());
if (clampedScrollOffset != adjustedScrollOffset())
scrollToOffset(clampedScrollOffset);
if (originalScrollOffset != adjustedScrollOffset())
scrollToOffsetWithoutAnimation(-scrollOrigin() + adjustedScrollOffset());
bool hasHorizontalOverflow = this->hasHorizontalOverflow();
bool hasVerticalOverflow = this->hasVerticalOverflow();
{
// Hits in compositing/overflow/automatically-opt-into-composited-scrolling-after-style-change.html.
DisableCompositingQueryAsserts disabler;
// overflow:scroll should just enable/disable.
if (box().style()->overflowX() == OSCROLL)
horizontalScrollbar()->setEnabled(hasHorizontalOverflow);
if (box().style()->overflowY() == OSCROLL)
verticalScrollbar()->setEnabled(hasVerticalOverflow);
}
// overflow:auto may need to lay out again if scrollbars got added/removed.
bool autoHorizontalScrollBarChanged = box().hasAutoHorizontalScrollbar() && (hasHorizontalScrollbar() != hasHorizontalOverflow);
bool autoVerticalScrollBarChanged = box().hasAutoVerticalScrollbar() && (hasVerticalScrollbar() != hasVerticalOverflow);
if (autoHorizontalScrollBarChanged || autoVerticalScrollBarChanged) {
if (box().hasAutoHorizontalScrollbar())
setHasHorizontalScrollbar(hasHorizontalOverflow);
if (box().hasAutoVerticalScrollbar())
setHasVerticalScrollbar(hasVerticalOverflow);
layer()->updateSelfPaintingLayer();
if (box().style()->overflowX() == OAUTO || box().style()->overflowY() == OAUTO) {
if (!m_inOverflowRelayout) {
// Our proprietary overflow: overlay value doesn't trigger a layout.
m_inOverflowRelayout = true;
SubtreeLayoutScope layoutScope(box());
layoutScope.setNeedsLayout(&box());
if (box().isRenderBlock()) {
RenderBlock& block = toRenderBlock(box());
block.scrollbarsChanged(autoHorizontalScrollBarChanged, autoVerticalScrollBarChanged);
block.layoutBlock(true);
} else {
box().layout();
}
m_inOverflowRelayout = false;
}
}
}
{
// Hits in compositing/overflow/automatically-opt-into-composited-scrolling-after-style-change.html.
DisableCompositingQueryAsserts disabler;
// Set up the range (and page step/line step).
if (Scrollbar* horizontalScrollbar = this->horizontalScrollbar()) {
int clientWidth = box().pixelSnappedClientWidth();
horizontalScrollbar->setProportion(clientWidth, overflowRect().width());
}
if (Scrollbar* verticalScrollbar = this->verticalScrollbar()) {
int clientHeight = box().pixelSnappedClientHeight();
verticalScrollbar->setProportion(clientHeight, overflowRect().height());
}
}
bool hasOverflow = hasScrollableHorizontalOverflow() || hasScrollableVerticalOverflow();
updateScrollableAreaSet(hasOverflow);
if (hasOverflow) {
DisableCompositingQueryAsserts disabler;
positionOverflowControls(IntSize());
}
}
~ScrollViewPrivate()
{
setHasHorizontalScrollbar(false);
setHasVerticalScrollbar(false);
}