void ScrollAnchor::adjust() {
if (!m_queued)
return;
m_queued = false;
DCHECK(m_scroller);
if (!m_anchorObject)
return;
IntSize adjustment = computeAdjustment();
if (adjustment.isZero())
return;
if (m_scrollAnchorDisablingStyleChanged) {
// Note that we only clear if the adjustment would have been non-zero.
// This minimizes redundant calls to findAnchor.
// TODO(skobes): add UMA metric for this.
clearSelf();
DEFINE_STATIC_LOCAL(EnumerationHistogram, suppressedBySanaclapHistogram,
("Layout.ScrollAnchor.SuppressedBySanaclap", 2));
suppressedBySanaclapHistogram.count(1);
return;
}
m_scroller->setScrollOffset(
m_scroller->getScrollOffset() + FloatSize(adjustment), AnchoringScroll);
// Update UMA metric.
DEFINE_STATIC_LOCAL(EnumerationHistogram, adjustedOffsetHistogram,
("Layout.ScrollAnchor.AdjustedScrollOffset", 2));
adjustedOffsetHistogram.count(1);
UseCounter::count(scrollerLayoutBox(m_scroller)->document(),
UseCounter::ScrollAnchored);
}
void ScrollAnchor::setScroller(ScrollableArea* scroller) {
DCHECK(m_scroller != scroller);
DCHECK(scroller);
DCHECK(scroller->isRootFrameViewport() || scroller->isFrameView() ||
scroller->isPaintLayerScrollableArea());
m_scroller = scroller;
clearSelf();
}
void ScrollAnchor::notifyBeforeLayout() {
if (m_queued) {
m_scrollAnchorDisablingStyleChanged |=
computeScrollAnchorDisablingStyleChanged();
return;
}
DCHECK(m_scroller);
ScrollOffset scrollOffset = m_scroller->getScrollOffset();
float blockDirectionScrollOffset =
scrollerLayoutBox(m_scroller)->isHorizontalWritingMode()
? scrollOffset.height()
: scrollOffset.width();
if (blockDirectionScrollOffset == 0) {
clearSelf();
return;
}
if (!m_anchorObject) {
findAnchor();
if (!m_anchorObject)
return;
m_anchorObject->setIsScrollAnchorObject();
m_savedRelativeOffset =
computeRelativeOffset(m_anchorObject, m_scroller, m_corner);
}
m_scrollAnchorDisablingStyleChanged =
computeScrollAnchorDisablingStyleChanged();
FrameView* frameView = scrollerLayoutBox(m_scroller)->frameView();
ScrollableArea* owningScroller =
m_scroller->isRootFrameViewport()
? &toRootFrameViewport(m_scroller)->layoutViewport()
: m_scroller.get();
frameView->enqueueScrollAnchoringAdjustment(owningScroller);
m_queued = true;
}
//自定义 右键菜单
void MusicList::contextMenuEvent(QContextMenuEvent *event)
{
//播放列表右键菜单
if (this->currentItem() == this->topLevelItem(0))
{
QMenu menu_rootDir;
menu_rootDir.addAction(tr("清空所有列表"), this, SLOT(clearAll()));
menu_rootDir.exec(event ->globalPos());
return;
}
for (int i=0; i<this->topLevelItemCount(); i++)
{
if (this->currentItem() == this->topLevelItem(i))
{
//创建节点菜单
QMenu menu_rootDir;
menu_rootDir.addAction(tr("删除"), this, SLOT(remove_rootDir()));
menu_rootDir.addAction(tr("重命名"), this, SLOT(renameToplevel(QTreeWidgetItem *item)));
menu_rootDir.addAction(tr("清空所有列表"), this, SLOT(clearAll()));
menu_rootDir.exec(event ->globalPos());
return;
}
}
//音乐右键菜单
QStringList otherToplevel; // 选中列表外的其他列表（用于添加到其他列表）
QString activedToplevel = this->topLevelItem(get_current_rootDir())->text(0); // 被右键选中的列表的名字
for(int i=0; i<this->topLevelItemCount(); i++) // 遍历选中之外的其他列表的名字
{
QString toplevelText = this->topLevelItem(i)->text(0);
if (toplevelText == activedToplevel)
{
continue;
}
otherToplevel.append(toplevelText);
}
//创建二级菜单
QMenu menu_child;
menu_child.setIcon(QIcon(":/Images/menu_add.png"));
menu_child.setTitle(tr("添加到..."));
for (int i=0; i<this->topLevelItemCount(); ++i)
{
if (this->topLevelItem(i) != this->topLevelItem(get_current_rootDir()))
{
menu_child.addAction(musicMenuActionList[i]);
}
}
connect(&menu_child, SIGNAL(triggered(QAction*)), this, SLOT(add_otherMusicList(QAction*)));
// for (int i=0; i<otherToplevel.count(); i++)
// {
// menu_child.addAction(otherToplevel.at(i), this, SLOT(add_otherMusicList()));
// }
//创建项目菜单
QMenu menu_item;
menu_item.addAction(QIcon(":/Images/menu_play.png"), tr("立即播放"), this, SLOT(rightBtnPlay()));
menu_item.addMenu(&menu_child);
menu_item.addAction(QIcon(":/Images/miniWindow_hover.png"), tr("移出列表"), this, SLOT(removeSelection()));
menu_item.addAction(QIcon(":/Images/closeWindow_hover.png"), tr("删除歌曲及文件"), this, SLOT(deleteSelection()));
menu_item.addAction(QIcon(":/Images/menu_clear.png"), tr("清空本列表"), this, SLOT(clearSelf()));
menu_item.exec(event ->globalPos());
return;
}
void ScrollAnchor::notifyRemoved(LayoutObject* layoutObject) {
if (m_anchorObject == layoutObject)
clearSelf();
}
