void RenderFrame::layout()
{
FrameView* view = static_cast<FrameView*>(widget());
RenderView* root = view ? view->frame()->contentRenderer() : 0;
// Do not expand frames which has zero width or height
if (!width() || !height() || !root) {
updateWidgetPosition();
if (view)
view->layout();
setNeedsLayout(false);
return;
}
HTMLFrameElementBase* element = static_cast<HTMLFrameElementBase*>(node());
if (element->scrollingMode() == ScrollbarAlwaysOff && !root->isFrameSet()) {
setNeedsLayout(false);
return;
}
// Update the dimensions to get the correct width and height
updateWidgetPosition();
if (root->preferredLogicalWidthsDirty())
root->computePreferredLogicalWidths();
// Expand the frame by setting frame height = content height
setWidth(max(view->contentsWidth() + borderAndPaddingWidth(), width()));
setHeight(max(view->contentsHeight() + borderAndPaddingHeight(), height()));
// Update one more time
updateWidgetPosition();
setNeedsLayout(false);
}
void RenderFrameBase::layoutWithFlattening(bool fixedWidth, bool fixedHeight)
{
FrameView* childFrameView = static_cast<FrameView*>(widget());
RenderView* childRoot = childFrameView ? static_cast<RenderView*>(childFrameView->frame()->contentRenderer()) : 0;
// Do not expand frames which has zero width or height
if (!width() || !height() || !childRoot) {
updateWidgetPosition();
if (childFrameView)
childFrameView->layout();
setNeedsLayout(false);
return;
}
// need to update to calculate min/max correctly
updateWidgetPosition();
if (childRoot->preferredLogicalWidthsDirty())
childRoot->computePreferredLogicalWidths();
// if scrollbars are off, and the width or height are fixed
// we obey them and do not expand. With frame flattening
// no subframe much ever become scrollable.
HTMLFrameElementBase* element = static_cast<HTMLFrameElementBase*>(node());
bool isScrollable = element->scrollingMode() != ScrollbarAlwaysOff;
// consider iframe inset border
int hBorder = borderLeft() + borderRight();
int vBorder = borderTop() + borderBottom();
// make sure minimum preferred width is enforced
if (isScrollable || !fixedWidth) {
setWidth(max(width(), childRoot->minPreferredLogicalWidth() + hBorder));
// update again to pass the new width to the child frame
updateWidgetPosition();
childFrameView->layout();
}
// expand the frame by setting frame height = content height
if (isScrollable || !fixedHeight || childRoot->isFrameSet())
setHeight(max(height(), childFrameView->contentsHeight() + vBorder));
if (isScrollable || !fixedWidth || childRoot->isFrameSet())
setWidth(max(width(), childFrameView->contentsWidth() + hBorder));
updateWidgetPosition();
ASSERT(!childFrameView->layoutPending());
ASSERT(!childRoot->needsLayout());
ASSERT(!childRoot->firstChild() || !childRoot->firstChild()->firstChild() || !childRoot->firstChild()->firstChild()->needsLayout());
setNeedsLayout(false);
}
void RenderFrameBase::peformLayoutWithFlattening(bool hasFixedWidth, bool hasFixedHeight)
{
if (!childRenderView())
return;
if (!shouldExpandFrame(width(), height(), hasFixedWidth, hasFixedHeight)) {
if (updateWidgetPosition() == ChildWidgetState::Destroyed)
return;
childView()->layout();
return;
}
// need to update to calculate min/max correctly
if (updateWidgetPosition() == ChildWidgetState::Destroyed)
return;
// if scrollbars are off, and the width or height are fixed
// we obey them and do not expand. With frame flattening
// no subframe much ever become scrollable.
bool isScrollable = frameOwnerElement().scrollingMode() != ScrollbarAlwaysOff;
// consider iframe inset border
int hBorder = borderLeft() + borderRight();
int vBorder = borderTop() + borderBottom();
// make sure minimum preferred width is enforced
if (isScrollable || !hasFixedWidth) {
ASSERT(childRenderView());
setWidth(std::max(width(), childRenderView()->minPreferredLogicalWidth() + hBorder));
// update again to pass the new width to the child frame
if (updateWidgetPosition() == ChildWidgetState::Destroyed)
return;
childView()->layout();
}
ASSERT(childView());
// expand the frame by setting frame height = content height
if (isScrollable || !hasFixedHeight || childRenderView()->isFrameSet())
setHeight(std::max<LayoutUnit>(height(), childView()->contentsHeight() + vBorder));
if (isScrollable || !hasFixedWidth || childRenderView()->isFrameSet())
setWidth(std::max<LayoutUnit>(width(), childView()->contentsWidth() + hBorder));
if (updateWidgetPosition() == ChildWidgetState::Destroyed)
return;
ASSERT(!childView()->layoutPending());
ASSERT(!childRenderView()->needsLayout());
ASSERT(!childRenderView()->firstChild() || !childRenderView()->firstChild()->firstChildSlow() || !childRenderView()->firstChild()->firstChildSlow()->needsLayout());
}
void QScrollAreaPrivate::updateScrollBars()
{
Q_Q(QScrollArea);
if (!widget)
return;
QSize p = viewport->size();
QSize m = q->maximumViewportSize();
QSize min = qSmartMinSize(widget);
QSize max = qSmartMaxSize(widget);
if (resizable) {
if ((widget->layout() ? widget->layout()->hasHeightForWidth() : widget->sizePolicy().hasHeightForWidth())) {
QSize p_hfw = p.expandedTo(min).boundedTo(max);
int h = widget->heightForWidth( p_hfw.width() );
min = QSize(p_hfw.width(), qMax(p_hfw.height(), h));
}
}
if ((resizable && m.expandedTo(min) == m && m.boundedTo(max) == m)
|| (!resizable && m.expandedTo(widget->size()) == m))
p = m; // no scroll bars needed
if (resizable)
widget->resize(p.expandedTo(min).boundedTo(max));
QSize v = widget->size();
hbar->setRange(0, v.width() - p.width());
hbar->setPageStep(p.width());
vbar->setRange(0, v.height() - p.height());
vbar->setPageStep(p.height());
updateWidgetPosition();
}
void AdvScrollArea::resizeEvent(QResizeEvent* e) {
std::cout << "RESIZE TO: " << e->size().width() << ":"<< e->size().height() << std::endl;
Q_UNUSED(e);
// scrollbar size
unsigned int scrS = 16;
unsigned int top = (headerH.widget) ? (headerH.height) : (0);
unsigned int left = (headerV.widget) ? (headerV.width) : (0);
// area
unsigned int areaW = width() - scrS - left;
unsigned int areaH = height() - scrS - top;
area->setGeometry(left, top, areaW, areaH);
area->setMaximumSize(areaW, areaH);
// scrollbar position
scrollV->setGeometry(width()-scrS, top, scrS, height()-scrS-top);
scrollH->setGeometry(left, height()-scrS, width()-scrS-left, scrS);
// scrollbar values
updateScrollBars();
// move the widget
updateWidgetPosition();
}
void QScrollAreaPrivate::updateScrollBars()
{
Q_Q(QScrollArea);
if (!widget)
return;
QSize p = viewport->size();
QSize m = q->maximumViewportSize();
QSize min = qSmartMinSize(widget);
QSize max = qSmartMaxSize(widget);
if ((resizable && m.expandedTo(min) == m && m.boundedTo(max) == m)
|| (!resizable && m.expandedTo(widget->size()) == m))
p = m; // no scroll bars needed
if (resizable)
widget->resize(p.expandedTo(min).boundedTo(max));
QSize v = widget->size();
hbar->setRange(0, v.width() - p.width());
hbar->setPageStep(p.width());
vbar->setRange(0, v.height() - p.height());
vbar->setPageStep(p.height());
updateWidgetPosition();
}
void QcScrollArea::updateScrollBars() {
QSize areaSize = viewport()->size();
QSize widgetSize = scrollWidget->size();
verticalScrollBar()->setPageStep(widgetSize.height());
horizontalScrollBar()->setPageStep(widgetSize.width());
verticalScrollBar()->setRange(0, widgetSize.height() - areaSize.height());
horizontalScrollBar()->setRange(0, widgetSize.width() - areaSize.width());
updateWidgetPosition();
}
void MyScrollArea::updateArea()
{
//! [1]
QSize areaSize = viewport()->size();
QSize widgetSize = widget->size();
verticalScrollBar()->setPageStep(areaSize.height());
horizontalScrollBar()->setPageStep(areaSize.width());
verticalScrollBar()->setRange(0, widgetSize.height() - areaSize.height());
horizontalScrollBar()->setRange(0, widgetSize.width() - areaSize.width());
updateWidgetPosition();
//! [1]
}
AdvScrollArea::AdvScrollArea(QWidget* parent) :
QWidget(parent), content(nullptr) {
// both scrollbars
scrollV = new QScrollBar(Qt::Vertical, this);
scrollH = new QScrollBar(Qt::Horizontal, this);
// connect events
connect(scrollV, SIGNAL(valueChanged(int)), this, SLOT(onScrollV()));
connect(scrollH, SIGNAL(valueChanged(int)), this, SLOT(onScrollH()));
// the widget accepting the content
area = new QWidget(this);
updateScrollBars();
updateWidgetPosition();
}
void AdvScrollArea::onScrollH() {
updateWidgetPosition();
}
void MyScrollArea::scrollContentsBy(int /*dx*/, int /*dy*/)
{
updateWidgetPosition();
}
void QcScrollArea::scrollContentsBy ( int dx, int dy ) {
updateWidgetPosition();
}
