How to draw different backgrounds using QStyledItemDelegate?

Question

How to draw different backgrounds using QStyledItemDelegate?

Problem

I have an object QTreeViewand QStandardItemModelas a model for viewing a widget;
For some element, I set the data using a method setDatato share it with a parameter;
Therefore, I need to highlight different background pixmap for QStandardItemelements that have an icon and some text data;
And you do not want to redraw all the objects of the objects, I mean the icon and the text. Just change the background.

Firstly, I thought that:

I could set CSS stylesheets in Qt Designerfor an object with two different background images, BUT QStandardItem does not have a method setProperty ...

Example:

QTreeView#treeView::item[ROLE="AAA"],
QTreeView#treeView::branch[ROLE="AAA"]
{
    height: 25px;
    border: none;
    color: #564f5b;
    background-image: url(:/backgrounds/images/row1.png);
    background-position: top left;
}

QTreeView#treeView::item[ROLE="BBB"],
QTreeView#treeView::branch[ROLE="BBB"]
{
    height: 25px;
    border: none;
    color: #564f5b;
    background-image: url(:/backgrounds/images/row2.png);
    background-position: top left;
}

, QStyledItemDelegate reimplement paint, . , QStyledItemDelegate::paint( painter, opt, index ); drawPixmap...

:

QStyleOptionViewItemV4 opt = option; //   QTBUG-4310
opt.state &= ~QStyle::State_HasFocus; //      

QStyledItemDelegate::paint( painter, opt, index );    

// HERE I WANT TO CHANGE BACKGROUND (DEFAULT IS ALREADY SET IN DESIGNER WITH ABOVE CODE)
if( index.data( SORT_ROLE ).toBool() )
{
    const QPixmap pixmap( ":/backgrounds/images/backgrounds/contractor_row__high_priority.png" );
    painter->drawPixmap( option.rect, pixmap, pixmap.rect() );

    QStyledItemDelegate::paint( painter, opt, index );
}

, ...

+3

qt qt4 qstyleditemdelegate

mosg 25 '12 16:16

2

- , .

, , , , .

+1

cmannett85 25 '12 16:31

mosg · Accepted Answer · 2012-05-28T12:23:31+0000

:

Designer:

QTreeView#treeView
{
    border: none;
    background-color:#f0f0f1;
}   

QTreeView#treeView::item,
QTreeView#treeView::branch
{
    height: 25px;
    border: none;
    color: #564f5b;
}

QTreeView#treeView::item:selected,
QTreeView#treeView::branch:selected
{
    border-bottom: none;
    color: #ffffff;    
    background-image: url(:/backgrounds/images/backgrounds/kontragents_row_selection.png);
    background-position: top left;  

}

QTreeView#treeView::item:selected:!active,
QTreeView#treeView::branch:selected:!active
{
    color: #ffffff;
}

paint():

void paint( QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index ) const
 {
      QStyleOptionViewItemV4 opt = option; //   QTBUG-4310
      opt.state &= ~QStyle::State_HasFocus; //     

      QBrush brush = opt.backgroundBrush;
      brush.setTexture( QPixmap( index.data( SORT_ROLE ).toBool()
           ? BACKGROUND_HIGH_PRIORITY
           : BACKGROUND_STANDARD ) );

      // FILL BACKGROUND     
      painter->save();
      painter->fillRect( opt.rect, brush );
      painter->restore();

      // DRAW ICON & TEXT
      QStyledItemDelegate::paint( painter, opt, index );

      // IF ( CHILD ) THEN PAINT OVER ONLY! BRANCH RECT
      bool isIndexParent = !index.parent().isValid();
      if( !isIndexParent )
      {
           QRect rect( 0, opt.rect.y(), 20, opt.rect.height() );

           if( opt.state & QStyle::State_Selected )
           {
                brush.setTexture( QPixmap( BACKGROUND_SELECTED ) );
           }

           painter->save();
           painter->fillRect( rect, brush );
           painter->restore();
      }
 }

QTreeView:

!:)

PS: , , ...

How to draw different backgrounds using QStyledItemDelegate?

More articles: