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The target for this method is setCSS, which, as you will see in a moment, is the name of a binding on the label element The method attribute is set to evaluateIn, which means the data to be used in this method call is the value of the select box You will evaluate this input to the selection box and pass that to the setCSS binding The workhorse of this application is the label element You can achieve the functionality I have been discussing the update of the label via binding with the text and via binding with the selection list by creating a couple of bindings on the label The first of these bindings is associated with the element called textBoxText, which is the Atlas identifier for the text box control (see its declaration).

Setting up a label in the viewport of the custom view SingleItemView::SingleItemView( QWidget *parent ) : QAbstractItemView( parent ) { QGridLayout *layout = new QGridLayout( this->viewport() ); label = new QLabel(); layout->addWidget( label, 0, 0 ); label->setAlignment( Qt::AlignCenter ); label->setSizePolicy( QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding ) ); label->setText( tr("<i>No data</i>") ); } In the constructor, a standard text is set; in the updateText method, the actual text is set Listing 5-19 shows the implementation of the method It works by looking at the number of QModelIndex objects it gets from the selection model s selection method The selection method returns indexes to all selected items in the model If the number of selected items is zero, the text is set to No data When one item is selected, the value of that item is shown.

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Up to this point, you ve used CodeConditions and configured Handlers in the code beside to determine if an activity should be executed The other option is RuleConditionReference, which points to a RuleCondition definition in a rules file associated with the workflow Open the VBIfElseSequentialExample from 3 Click the Branch1 activity and open the Properties window You ll see the property called Condition In the example in 3, you selected CodeCondition, but if you click the drop-down box you ll see you can choose either Code Condition or Declarative Rule Condition, as shown in Figure 5-1..

Otherwise, meaning more than one selected item, a text informing the user that only one item can be shown is displayed The value of the selected item is retrieved through the model s data method and the currentIndex method As long as at least one item is selected, the combination of these methods will return the value from the current item Listing 5-19 Updating the text of the label void SingleItemView::updateText() { switch( selectionModel()->selection()indexes()count() ) { case 0:.

label->setText( tr("<i>No data.</i>") ); break; case 1: label->setText( model()->data( currentIndex() ).toString() ); break; default: label->setText( tr("<i>Too many items selected.<br>" "Can only show one item at a time.</i>") ); break; } } Because a large part of the view s job is to show items, the views need to have methods for telling what is visible and where. Because the view shows only one item, you are left with an all-or-nothing situation. The method visualRect, shown in Listing 5-20, returns a rectangle containing a given model index. The method simply checks whether it is the visible item if so, the area of the entire view is returned; otherwise, an empty rectangle is returned. There are more methods working in the same way: visualRegionForSelection, isIndexHidden, and indexAt. All these methods check to see whether the given model index is the one that is shown and then returns accordingly. Listing 5-20. Determining what is visible and what is not QRect SingleItemView::visualRect( const QModelIndex &index ) const { if( selectionModel()->selection().indexes().count() != 1 ) return QRect(); if( currentIndex() != index ) return QRect(); return rect(); } The purpose of some methods is to return valid values to maintain a predefined interface, which is the job of the methods shown in Listing 5-21. Because the scroll bars are left unused, and only one item is shown at a time, these methods are left as close to empty as possible. Listing 5-21. Returning valid responses without taking action int SingleItemView::horizontalOffset() const { return horizontalScrollBar()->value(); }

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