void QProxyLayout::setLayout(QGraphicsLayout *l)
{
proxy = l;
updateGeometry();
if (parentLayoutItem())
parentLayoutItem()->updateGeometry();
}
/*!
\reimp
*/
void QGraphicsLayout::updateGeometry()
{
Q_D(QGraphicsLayout);
if (QGraphicsLayout::instantInvalidatePropagation()) {
d->activated = false;
QGraphicsLayoutItem::updateGeometry();
QGraphicsLayoutItem *parentItem = parentLayoutItem();
if (!parentItem)
return;
if (parentItem->isLayout())
static_cast<QGraphicsLayout *>(parentItem)->invalidate();
else
parentItem->updateGeometry();
} else {
QGraphicsLayoutItem::updateGeometry();
if (QGraphicsLayoutItem *parentItem = parentLayoutItem()) {
if (parentItem->isLayout()) {
parentItem->updateGeometry();
} else {
invalidate();
}
}
}
}
void QProxyLayoutItem::setItem(QGraphicsLayoutItem *o)
{
if (other == o)
return;
other = o;
if (enabled && other)
other->setGeometry(geometry);
updateGeometry();
if (parentLayoutItem())
parentLayoutItem()->updateGeometry();
}
/*!
Activates the layout, causing all items in the layout to be immediately
rearranged. This function is based on calling count() and itemAt(), and
then calling setGeometry() on all items sequentially. When activated,
the layout will adjust its geometry to its parent's contentsRect().
The parent will then invalidate any layout of its own.
If called in sequence or recursively, e.g., by one of the arranged items
in response to being resized, this function will do nothing.
Note that the layout is free to use geometry caching to optimize this
process. To forcefully invalidate any such cache, you can call
invalidate() before calling activate().
\sa invalidate()
*/
void QGraphicsLayout::activate()
{
Q_D(QGraphicsLayout);
if (d->activated)
return;
d->activateRecursive(this);
// we don't call activate on a sublayout, but somebody might.
// Therefore, we walk to the parentitem of the toplevel layout.
QGraphicsLayoutItem *parentItem = this;
while (parentItem && parentItem->isLayout())
parentItem = parentItem->parentLayoutItem();
if (!parentItem)
return;
Q_ASSERT(!parentItem->isLayout());
if (QGraphicsLayout::instantInvalidatePropagation()) {
QGraphicsWidget *parentWidget = static_cast<QGraphicsWidget*>(parentItem);
if (!parentWidget->parentLayoutItem()) {
// we've reached the topmost widget, resize it
bool wasResized = parentWidget->testAttribute(Qt::WA_Resized);
parentWidget->resize(parentWidget->size());
parentWidget->setAttribute(Qt::WA_Resized, wasResized);
}
setGeometry(parentItem->contentsRect()); // relayout children
} else {
setGeometry(parentItem->contentsRect()); // relayout children
parentLayoutItem()->updateGeometry();
}
}
/*!
\reimp
*/
void QGraphicsLayout::updateGeometry()
{
QGraphicsLayoutItem::updateGeometry();
if (QGraphicsLayoutItem *parentItem = parentLayoutItem()) {
if (parentItem->isLayout()) {
parentItem->updateGeometry();
} else {
invalidate();
}
}
}
/*!
Destroys the QGraphicsLayoutItem object.
*/
QGraphicsLayoutItem::~QGraphicsLayoutItem()
{
QGraphicsLayoutItem *parentLI = parentLayoutItem();
if (parentLI && parentLI->isLayout()) {
QGraphicsLayout *lay = static_cast<QGraphicsLayout*>(parentLI);
// this is not optimal
for (int i = lay->count() - 1; i >= 0; --i) {
if (lay->itemAt(i) == this) {
lay->removeAt(i);
break;
}
}
}
}
/*!
This virtual event handler receives all events for the managed
widget. QGraphicsLayout uses this event handler to listen for layout
related events such as geometry changes, layout changes or layout
direction changes.
\a e is a pointer to the event.
You can reimplement this event handler to track similar events for your
own custom layout.
\sa QGraphicsWidget::event(), QGraphicsItem::sceneEvent()
*/
void QGraphicsLayout::widgetEvent(QEvent *e)
{
switch (e->type()) {
case QEvent::GraphicsSceneResize:
if (isActivated()) {
setGeometry(parentLayoutItem()->contentsRect());
} else {
activate(); // relies on that activate() will call updateGeometry()
}
break;
case QEvent::LayoutRequest:
activate();
break;
case QEvent::LayoutDirectionChange:
invalidate();
break;
default:
break;
}
}
/*!
Activates the layout, causing all items in the layout to be immediately
rearranged. This function is based on calling count() and itemAt(), and
then calling setGeometry() on all items sequentially. When activated,
the layout will adjust its geometry to its parent's contentsRect().
The parent will then invalidate any layout of its own.
If called in sequence or recursively, e.g., by one of the arranged items
in response to being resized, this function will do nothing.
Note that the layout is free to use geometry caching to optimize this
process. To forcefully invalidate any such cache, you can call
invalidate() before calling activate().
\sa invalidate()
*/
void QGraphicsLayout::activate()
{
Q_D(QGraphicsLayout);
if (d->activated)
return;
d->activateRecursive(this);
// we don't call activate on a sublayout, but somebody might.
// Therefore, we walk to the parentitem of the toplevel layout.
QGraphicsLayoutItem *parentItem = this;
while (parentItem && parentItem->isLayout())
parentItem = parentItem->parentLayoutItem();
if (!parentItem)
return;
Q_ASSERT(!parentItem->isLayout());
setGeometry(parentItem->contentsRect()); // relayout children
if (!QGraphicsLayout::instantInvalidatePropagation()) {
parentLayoutItem()->updateGeometry();
}
}
/*!
Activates the layout, causing all items in the layout to be immediately
rearranged. This function is based on calling count() and itemAt(), and
then calling setGeometry() on all items sequentially. When activated,
the layout will adjust its geometry to its parent's contentsRect().
The parent will then invalidate any layout of its own.
If called in sequence or recursively, e.g., by one of the arranged items
in response to being resized, this function will do nothing.
Note that the layout is free to use geometry caching to optimize this
process. To forcefully invalidate any such cache, you can call
invalidate() before calling activate().
\sa invalidate()
*/
void QGraphicsLayout::activate()
{
Q_D(QGraphicsLayout);
if (d->activated)
return;
d->activateRecursive(this);
// we don't call activate on a sublayout, but somebody might.
// Therefore, we walk to the parentitem of the toplevel layout.
QGraphicsLayoutItem *parentItem = this;
while (parentItem && parentItem->isLayout())
parentItem = parentItem->parentLayoutItem();
if (!parentItem)
return;
Q_ASSERT(!parentItem->isLayout());
setGeometry(parentItem->contentsRect()); // relayout children
// ### bug, should be parentItem ?
parentLayoutItem()->updateGeometry(); // bubble up; will set activated to false
// ### too many resizes? maybe we should walk up the chain to the
// ### top-level layouted layoutItem and call activate there.
}
