void KItemListView::setItemOffset(qreal offset)
{
+ if (m_layouter->itemOffset() == offset) {
+ return;
+ }
+
m_layouter->setItemOffset(offset);
if (m_header) {
m_header->setPos(-offset, 0);
}
- if (!m_layoutTimer->isActive()) {
- doLayout(NoAnimation);
- }
+
+ // Don't check whether the m_layoutTimer is active: Changing the
+ // item offset must always trigger a synchronous layout, otherwise
+ // the smooth-scrolling might get jerky.
+ doLayout(NoAnimation);
}
qreal KItemListView::itemOffset() const
return;
}
- if (m_model->count() > 0) {
- prepareLayoutForIncreasedItemCount(rect.size(), LayouterSize);
+ const QSizeF newSize = rect.size();
+ if (m_itemSize.isEmpty()) {
+ // The item size is dynamic:
+ // Changing the geometry does not require to do an expensive
+ // update of the visible-roles sizes, only the stretched sizes
+ // need to be adjusted to the new size.
+ updateStretchedVisibleRolesSizes();
+
+ if (m_useHeaderWidths) {
+ QSizeF dynamicItemSize = m_layouter->itemSize();
+
+ if (m_itemSize.width() < 0) {
+ const qreal requiredWidth = visibleRolesSizesWidthSum();
+ if (newSize.width() > requiredWidth) {
+ dynamicItemSize.setWidth(newSize.width());
+ }
+ const qreal headerWidth = qMax(newSize.width(), requiredWidth);
+ m_header->resize(headerWidth, m_header->size().height());
+ }
+
+ if (m_itemSize.height() < 0) {
+ const qreal requiredHeight = visibleRolesSizesHeightSum();
+ if (newSize.height() > requiredHeight) {
+ dynamicItemSize.setHeight(newSize.height());
+ }
+ // TODO: KItemListHeader is not prepared for vertical alignment
+ }
+
+ m_layouter->setItemSize(dynamicItemSize);
+ }
+
+ // Triggering a synchronous layout is fine from a performance point of view,
+ // as with dynamic item sizes no moving animation must be done.
+ m_layouter->setSize(newSize);
+ doLayout(Animation);
} else {
- m_layouter->setSize(rect.size());
- }
+ // The item size is not dynamic and most probably the geometry change results
+ // in animated position changes of the items. Trigger an asynchronous relayout
+ // with m_layoutTimer to prevent performance bottlenecks.
+ if (m_model->count() > 0) {
+ prepareLayoutForIncreasedItemCount(newSize, LayouterSize);
+ } else {
+ m_layouter->setSize(newSize);
+ }
- if (!m_layoutTimer->isActive()) {
- m_layoutTimer->start();
+ if (!m_layoutTimer->isActive()) {
+ m_layoutTimer->start();
+ }
}
-
- // Changing the geometry does not require to do an expensive
- // update of the visible-roles sizes, only the stretched sizes
- // need to be adjusted to the new size.
- updateStretchedVisibleRolesSizes();
}
int KItemListView::itemAt(const QPointF& pos) const
bool KItemListView::isAboveSelectionToggle(int index, const QPointF& pos) const
{
+ if (!m_enabledSelectionToggles) {
+ return false;
+ }
+
const KItemListWidget* widget = m_visibleItems.value(index);
if (widget) {
const QRectF selectionToggleRect = widget->selectionToggleRect();
return m_visibleItems.values();
}
-void KItemListView::resizeEvent(QGraphicsSceneResizeEvent* event)
-{
- QGraphicsWidget::resizeEvent(event);
- if (m_itemSize.isEmpty() && m_useHeaderWidths) {
- QSizeF dynamicItemSize = m_layouter->itemSize();
- const QSizeF newSize = event->newSize();
-
- if (m_itemSize.width() < 0) {
- const qreal requiredWidth = visibleRolesSizesWidthSum();
- if (newSize.width() > requiredWidth) {
- dynamicItemSize.setWidth(newSize.width());
- }
- const qreal headerWidth = qMax(newSize.width(), requiredWidth);
- m_header->resize(headerWidth, m_header->size().height());
- }
-
- if (m_itemSize.height() < 0) {
- const qreal requiredHeight = visibleRolesSizesHeightSum();
- if (newSize.height() > requiredHeight) {
- dynamicItemSize.setHeight(newSize.height());
- }
- // TODO: KItemListHeader is not prepared for vertical alignment
- }
-
- m_layouter->setItemSize(dynamicItemSize);
- }
-}
-
void KItemListView::slotItemsInserted(const KItemRangeList& itemRanges)
{
updateVisibleRolesSizes(itemRanges);
}
m_layouter->markAsDirty();
- if (m_model->count() == count && maximumScrollOffset() > size().height()) {
- const int scrollBarExtent = style()->pixelMetric(QStyle::PM_ScrollBarExtent);
- QSizeF layouterSize = m_layouter->size();
- if (scrollOrientation() == Qt::Vertical) {
- layouterSize.rwidth() -= scrollBarExtent;
- } else {
- layouterSize.rheight() -= scrollBarExtent;
+ if (m_model->count() == count && m_activeTransactions == 0) {
+ // Check whether a scrollbar is required to show the inserted items. In this case
+ // the size of the layouter will be decreased before calling doLayout(): This prevents
+ // an unnecessary temporary animation due to the geometry change of the inserted scrollbar.
+ const bool verticalScrollOrientation = (scrollOrientation() == Qt::Vertical);
+ const bool decreaseLayouterSize = ( verticalScrollOrientation && maximumScrollOffset() > size().height()) ||
+ (!verticalScrollOrientation && maximumScrollOffset() > size().width());
+ if (decreaseLayouterSize) {
+ const int scrollBarExtent = style()->pixelMetric(QStyle::PM_ScrollBarExtent);
+ QSizeF layouterSize = m_layouter->size();
+ if (verticalScrollOrientation) {
+ layouterSize.rwidth() -= scrollBarExtent;
+ } else {
+ layouterSize.rheight() -= scrollBarExtent;
+ }
+ m_layouter->setSize(layouterSize);
}
- m_layouter->setSize(layouterSize);
}
if (!hasMultipleRanges) {
m_layouter->markAsDirty();
if (!hasMultipleRanges) {
+ // The decrease-layout-size optimization in KItemListView::slotItemsInserted()
+ // assumes an updated geometry. If items are removed during an active transaction,
+ // the transaction will be temporary deactivated so that doLayout() triggers a
+ // geometry update if necessary.
+ const int activeTransactions = m_activeTransactions;
+ m_activeTransactions = 0;
doLayout(Animation, index, -count);
+ m_activeTransactions = activeTransactions;
}
}
return;
}
- const int firstVisibleIndex = m_layouter->firstVisibleIndex();
- const int lastVisibleIndex = m_layouter->lastVisibleIndex();
+ int firstVisibleIndex = m_layouter->firstVisibleIndex();
if (firstVisibleIndex < 0) {
emitOffsetChanges();
return;
const qreal maxOffsetToShowFullRange = maximumScrollOffset() - visibleOffsetRange;
if (scrollOffset() > maxOffsetToShowFullRange) {
m_layouter->setScrollOffset(qMax(qreal(0), maxOffsetToShowFullRange));
+ firstVisibleIndex = m_layouter->firstVisibleIndex();
}
- // Determine all items that are completely invisible and might be
- // reused for items that just got (at least partly) visible.
- // Items that do e.g. an animated moving of their position are not
- // marked as invisible: This assures that a scrolling inside the view
- // can be done without breaking an animation.
- QList<int> reusableItems;
- QHashIterator<int, KItemListWidget*> it(m_visibleItems);
- while (it.hasNext()) {
- it.next();
- KItemListWidget* widget = it.value();
- const int index = widget->index();
- const bool invisible = (index < firstVisibleIndex) || (index > lastVisibleIndex);
- if (invisible && !m_animation->isStarted(widget)) {
- widget->setVisible(false);
- reusableItems.append(index);
+ const int lastVisibleIndex = m_layouter->lastVisibleIndex();
- if (m_grouped) {
- recycleGroupHeaderForWidget(widget);
- }
- }
- }
+ QList<int> reusableItems = recycleInvisibleItems(firstVisibleIndex, lastVisibleIndex);
// Assure that for each visible item a KItemListWidget is available. KItemListWidget
// instances from invisible items are reused. If no reusable items are
const bool itemsInserted = (changedCount > 0);
if (itemsRemoved && (i >= changedIndex + changedCount + 1)) {
// The item is located after the removed items. Animate the moving of the position.
- m_animation->start(widget, KItemListViewAnimation::MovingAnimation, newPos);
- applyNewPos = false;
+ applyNewPos = !moveWidget(widget, newPos);
} else if (itemsInserted && i >= changedIndex) {
// The item is located after the first inserted item
if (i <= changedIndex + changedCount - 1) {
// The item was already there before, so animate the moving of the position.
// No moving animation is done if the item is animated by a create animation: This
// prevents a "move animation mess" when inserting several ranges in parallel.
- m_animation->start(widget, KItemListViewAnimation::MovingAnimation, newPos);
- applyNewPos = false;
+ applyNewPos = !moveWidget(widget, newPos);
}
} else if (!itemsRemoved && !itemsInserted && !wasHidden) {
// The size of the view might have been changed. Animate the moving of the position.
- m_animation->start(widget, KItemListViewAnimation::MovingAnimation, newPos);
- applyNewPos = false;
+ applyNewPos = !moveWidget(widget, newPos);
}
}
emitOffsetChanges();
}
+QList<int> KItemListView::recycleInvisibleItems(int firstVisibleIndex, int lastVisibleIndex)
+{
+ // Determine all items that are completely invisible and might be
+ // reused for items that just got (at least partly) visible.
+ // Items that do e.g. an animated moving of their position are not
+ // marked as invisible: This assures that a scrolling inside the view
+ // can be done without breaking an animation.
+
+ QList<int> items;
+
+ QHashIterator<int, KItemListWidget*> it(m_visibleItems);
+ while (it.hasNext()) {
+ it.next();
+ KItemListWidget* widget = it.value();
+ const int index = widget->index();
+ const bool invisible = (index < firstVisibleIndex) || (index > lastVisibleIndex);
+ if (invisible && !m_animation->isStarted(widget)) {
+ widget->setVisible(false);
+ items.append(index);
+
+ if (m_grouped) {
+ recycleGroupHeaderForWidget(widget);
+ }
+ }
+ }
+
+ return items;
+}
+
+bool KItemListView::moveWidget(KItemListWidget* widget, const QPointF& newPos)
+{
+ // The moving-animation should only be started, if it is done within one
+ // row or one column. Otherwise instead of a moving-animation a
+ // create-animation on the new position will be used instead. This is done
+ // to prevent "irritating" moving-animations.
+ const QPointF oldPos = widget->pos();
+ const qreal xDiff = qAbs(oldPos.x() - newPos.x());
+ const qreal yDiff = qAbs(oldPos.y() - newPos.y());
+ if (xDiff <= m_itemSize.width() || yDiff <= m_itemSize.height()) {
+ // The moving animation is done inside a column or a row.
+ m_animation->start(widget, KItemListViewAnimation::MovingAnimation, newPos);
+ return true;
+ }
+
+ m_animation->stop(widget);
+ m_animation->start(widget, KItemListViewAnimation::CreateAnimation);
+ return false;
+}
+
void KItemListView::emitOffsetChanges()
{
const qreal newScrollOffset = m_layouter->scrollOffset();
projects / dolphin.git / blobdiff