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added ensureItemVisible(QGraphicsItem*)

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svn path=/trunk/KDE/kdelibs/; revision=1031380
This commit is contained in:
Giulio Camuffo 2009-10-04 20:08:37 +00:00
parent 2147d8e090
commit 81b39250cb
2 changed files with 60 additions and 20 deletions
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70
widgets/scrollwidget.cpp
View File

@ -24,6 +24,7 @@
#include <QGraphicsGridLayout>
#include <QApplication>
#include <QWidget>
#include <QTimer>
//KDE
#include <kmimetype.h>
@ -182,6 +183,38 @@ public:
scrollingWidget->setFlag(QGraphicsItem::ItemClipsChildrenToShape, true);
}
void makeRectVisible()
{
QRectF viewRect = scrollingWidget->boundingRect();
//ensure the rect is not outside the widget bounding rect
QRectF mappedRect = QRectF(QPointF(qBound((qreal)0.0, rectToBeVisible.x(), widget->size().width() - rectToBeVisible.width()),
qBound((qreal)0.0, rectToBeVisible.y(), widget->size().height() - rectToBeVisible.height())),
rectToBeVisible.size());
mappedRect = widget->mapToItem(scrollingWidget, mappedRect).boundingRect();
if (viewRect.contains(mappedRect)) {
return;
}
QPointF delta(0, 0);
if (mappedRect.top() < 0) {
delta.setY(-mappedRect.top());
} else if (mappedRect.bottom() > viewRect.bottom()) {
delta.setY(viewRect.bottom() - mappedRect.bottom());
}
if (mappedRect.left() < 0) {
delta.setX(-mappedRect.left());
} else if (mappedRect.right() > viewRect.right()) {
delta.setX(viewRect.right() - mappedRect.right());
}
animId = Animator::self()->moveItem(
widget, Plasma::Animator::SlideOutMovement,
(widget->pos() + delta).toPoint());
}
ScrollWidget *q;
QGraphicsWidget *scrollingWidget;
QGraphicsWidget *widget;
@ -196,6 +229,7 @@ public:
ScrollBar *horizontalScrollBar;
Qt::ScrollBarPolicy horizontalScrollBarPolicy;
QString styleSheet;
QRectF rectToBeVisible;
bool dragging;
int animId;
};
@ -284,32 +318,30 @@ void ScrollWidget::ensureRectVisible(const QRectF &rect)
return;
}
QRectF viewRect = d->scrollingWidget->boundingRect();
//ensure the rect is not outside the widget bounding rect
QRectF mappedRect = QRectF(QPointF(qBound((qreal)0.0, rect.x(), d->widget->size().width()-rect.width()),
qBound((qreal)0.0, rect.y(), d->widget->size().height()-rect.height())), rect.size());
mappedRect = d->widget->mapToItem(d->scrollingWidget, mappedRect).boundingRect();
if (viewRect.contains(mappedRect)) {
d->rectToBeVisible = rect;
d->makeRectVisible();
}
void ScrollWidget::ensureItemVisible(QGraphicsItem *item)
{
if (!d->widget || !item) {
return;
}
QPointF delta(0, 0);
QGraphicsItem *parentOfItem = item->parentItem();
while (parentOfItem != d->widget) {
if (!parentOfItem) {
return;
}
if (mappedRect.top() < 0) {
delta.setY(-mappedRect.top());
} else if (mappedRect.bottom() > viewRect.bottom()) {
delta.setY(viewRect.bottom() - mappedRect.bottom());
parentOfItem = parentOfItem->parentItem();
}
if (mappedRect.left() < 0) {
delta.setX(-mappedRect.left());
} else if (mappedRect.right() > viewRect.right()) {
delta.setX(viewRect.right() - mappedRect.right());
}
QRectF rect(d->widget->mapFromScene(item->scenePos()), item->boundingRect().size());
d->rectToBeVisible = rect;
d->animId = Animator::self()->moveItem(
d->widget, Plasma::Animator::SlideOutMovement,
(d->widget->pos() + delta).toPoint());
// We need to wait for the parent item to resize...
QTimer::singleShot(0, this, SLOT(makeRectVisible()));
}
qreal ScrollWidget::horizontalScrollValue() const

10
widgets/scrollwidget.h
View File

@ -106,6 +106,14 @@ public:
*/
void ensureRectVisible(const QRectF &rect);
/**
* Scroll the view until the given item is visible
*
* @param item item we want visible
* @since 4.4
*/
void ensureItemVisible(QGraphicsItem *item);
/**
* The horizontal scroll value, between 0 and 100
* @since 4.4
@ -169,7 +177,7 @@ private:
Q_PRIVATE_SLOT(d, void verticalScroll(int value))
Q_PRIVATE_SLOT(d, void horizontalScroll(int value))
Q_PRIVATE_SLOT(d, void makeRectVisible())
};
} // namespace Plasma