C++ (Cpp) QGraphicsLinearLayout::removeAt示例

void ActivityManager::sortActivities() {
  QGraphicsLinearLayout *layout = static_cast<QGraphicsLinearLayout *>(static_cast<QGraphicsWidget *>(extender()->item("Activities")->widget())->layout());
  // remove all activities from the layout
  while (layout->count())
    layout->removeAt(0);
  // insert all activities to a map
  QMap<QString, ActivityWidget *> activities;
  foreach (ActivityWidget *activity, m_activities.values())
    activities.insertMulti(activity->name(), activity);
  // add activities into the layout at ascending order of their names
  foreach (ActivityWidget *activity, activities.values())
    layout->addItem(activity);
}

示例#2

显示文件

文件： TabsView.cpp 项目： ErrAza/amarok

void
TabsView::updateScrollBarVisibility()
{
    QGraphicsLinearLayout *lo = static_cast<QGraphicsLinearLayout*>( layout() );
    if( m_scrollBar->maximum() == 0 )
    {
        if( lo->count() > 2 && lo->itemAt( 1 ) == m_scrollBar )
        {
            lo->removeAt( 1 );
            m_scrollBar->hide();
        }
    }
    else if( lo->count() == 2 )
    {
        lo->insertItem( 1, m_scrollBar );
        m_scrollBar->show();
    }
}