C++ (Cpp) QListView::firstChild示例

QListViewItem * ListViewDnd::itemAt( QPoint pos )
{
    QListView * src = (QListView *) this->src;
    int headerHeight = (int)(src->header()->height());
    pos.ry() -= headerHeight;
    QListViewItem * result = src->itemAt( pos );

    if ( result && ( pos.ry() < (src->itemPos(result) + result->height()/2) ) )
	result = result->itemAbove();

    // Wind back if has parent, and we're in flat mode
    while ( result && result->parent() && (dMode & Flat) )
	result = result->parent();

    // Wind back if has parent, and we're in flat mode
    while ( result && !result->isVisible() && result->parent() )
	result = result->parent();

    if ( !result && src->firstChild() && (pos.y() > src->itemRect(src->firstChild()).bottom()) ) {
	result = src->lastItem();
	if ( !result->isVisible() )
	    // Handle special case where last item is actually hidden
	    result = result->itemAbove();
    }

    return result;
}

示例#2

显示文件

文件： listviewdnd.cpp 项目： AliYousuf/univ-aca-mips

void ListViewDnd::updateLine( const QPoint & dragPos )
{
    QListViewItem * item = itemAt(dragPos);
    QListView * src = (QListView *) this->src;

    int ypos = item ? 
	( src->itemRect( item ).bottom() - ( line->height() / 2 ) ) : 
	( src->itemRect( src->firstChild() ).top() );

    int xpos = dropDepth( item, dragPos ) * src->treeStepSize();
    line->resize( src->viewport()->width() - xpos, line->height() );
    line->move( xpos, ypos );
}