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By selecting the checkbox on the left, the checkbox on the right will change its value, and it will be the opposite value of the left one. In addition, the text box on the right will change its text to reflect the value of the left checkbox. Coolest of all, you can type in the text box, and if you change false to true, or vice versa, the checkboxes will update accordingly. So, if you type true, the left checkbox will be selected, and the right one will be cleared. How does this work Well, let s first look at the Atlas Script that implements it.

Start by creating a delegate to show integer values as a bar. The delegate can be seen in action in the table view shown in Figure 5-5. The bars range from 0 100, where 0 is just a thin line in blue, and 100 is a full green bar. If the value exceeds 100, the bar turns red to indicate that it is out of range.

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Figure 5-5. The BarDelegate class is used to show integer values as bars. Because it is a delegate for showing bars, the new class is called BarDelegate and is built on the QAbstractItemDelegate class. The abstract item delegate class is the base class of all delegates. The class declaration is shown in Listing 5-9. The code can be considered a boilerplate for all delegates managing the showing of values because both methods to override are clearly stated in the documentation for the QAbstractItemDelegate base class. The purpose of the method is easy to guess from its name. The paint(QPainter*, const QStyleOptionViewItem&, const QModelIndex&) method draws the item, whereas sizeHint(const QStyleOptionViewItem&, const QmodelIndex&) indicates how large the each item wants to be.

This activity, like several others in this chapter, has been covered previously. The EventDriven activity is a container for other activities. The EventDriven activity is triggered by an event, and the first activity must wait for some external event to occur. Within a Sequential workflow, you must use a Listen activity. The Listen activity is a composite activity made up of two EventDriven activities (this will be covered more in 7). You can use a Delay activity as the first activity within the EventDriven activity to pause workflow first. Then, when the delay has expired, the next activity within the EventDriven activity is executed. In this case, the Delay activity acts as an event to trigger the next activity within the EventDriven activity.

The following is the complete Atlas Script for this page (you can see the whole page, including the HTML markup, in the download for this chapter): <script type="text/xml-script"> <page xmlns:script="http://schemas.microsoft.com/xml-script/2005"> <components> <textBox targetElement="textBox">

Listing 5-9. The class declaration of the custom delegate class BarDelegate : public QAbstractItemDelegate { public: BarDelegate( QObject *parent = 0 ); void paint( QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index ) const; QSize sizeHint( const QStyleOptionViewItem &option, const QModelIndex &index ) const; }; The sizeHint method is shown in Listing 5-10. It simply returns a size that is large enough yet doesn t exceed the size limitations. Remember that this is just a hint; the real size can be changed by Qt for layout issues or by the user by adjusting the size of rows and columns. Listing 5-10. Returning a size hint for the custom delegate QSize BarDelegate::sizeHint( const QStyleOptionViewItem &option, const QModelIndex &index ) const { return QSize( 45, 15 ); } The sizeHint method is very straightforward; the paint method is more interesting (see Listing 5-11). The first if statement checks whether the item is selected by testing the state of the style option. (Style options are used to control the appearance of everything in Qt applications.) The styling system responsible for making Qt applications look like native applications uses style option objects for palettes, areas, visual states, and everything else that affects the appearance of objects on the screen. There are numerous style object classes almost one for every graphical element. All inherit the QStyleOption class. Listing 5-11. Painting the value for the custom delegate void BarDelegate::paint( QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index ) const { if( option.state & QStyle::State_Selected ) painter->fillRect( option.rect, option.palette.highlight() ); int value = index.model()->data( index, Qt::DisplayRole ).toInt(); double factor = (double)value/100.0; painter->save(); if( factor > 1 ) {

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