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Caution Trying to specify signal or slot argument values when connecting will cause your code to fail at

In the previous example, you saw the floatingWindowBehavior and how you can use it to implement a pop-up menu. You can also use this behavior to implement true floating windows where you can drag and drop to rearrange information on your screen. You are probably familiar with this if you have used portals such as Live.com or Start.com that allow you to arrange the screen according to your preferences. In this example, you ll do exactly that. You ll have a page with a number of HTML panes in it that can be rearranged as you desire. This uses the <floatingBehavior> control to implement this functionality. This is the power of behaviors. You simply have to identify an element and add the behavior to it.

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update(); emit valueChanged( m_value ); } In Listing 6-23 you can see the implementation of the paintEvent method Before you look at the code, you should know how the autoFillBackground property works As long as it is set to true (the default), the widget s background is filled with the appropriate color before the paintEvent method is entered This means that we do not have to worry about clearing the widget's area before painting to it The radius and factor helper variables are calculated in the paintEvent method Then a QPainter object is created to draw the widget First the pen is set to black, and the outer circle is drawn; then the brush is set to black, and the inner circle is drawn The pen is used to draw the contour of the circle; the brush is used to fill it.

By default, both are set to draw nothing, so setting the pen only before drawing the outer circle gives a circle contour Listing 6-23 Painting the outer and inner circles void CircleBar::paintEvent( QPaintEvent *event ) { int radius = width()/2; double factor = m_value/1000; QPainter p( this ); psetPen( Qt::black ); pdrawEllipse( 0, 0, width()-1, width()-1 ); psetBrush( Qt::black ); pdrawEllipse( (int)(radius*(10-factor)), (int)(radius*(10-factor)), (int)((width()-1)*factor)+1, (int)((width()-1)*factor)+1 ); } The final piece of the CircleBar widget is the wheelEvent method (see Listing 6-24) First the event is accepted before the value is updated using setValue The delta value of the QWheelEvent object tells how many eighths of a degree the scroll movement is Most mice scroll 15 degrees at a time, so each click in the scroll wheel corresponds to a delta of 120.

You can see this example in action in Figure 5-21.

In this chapter, to make the IfElse activities easier to change, you re going to remove the CodeConditions from all the IfElse activities within the Purchase Order application and replace them with Declarative Rule Conditions. By doing this, if the workflow was in production, the rules could be changed on the fly without needing to redistribute the application or even rebuild the application. Instead, the rules file could be changed. To begin, open the VBPurchaseOrderConsole application. Open the PurchaseOrderProcess workflow and click each of the left and right branches of the various IfElse activities. Change the Condition property to None for now. After you change the CodeCondition to None, you ll see a red exclamation point appear near that branch of the IfElse activity, as shown in Figure 5-17.

I chose to divide the delta value by 20 before using it to change the value I picked the value 20 by feel the bar is resized quickly enough while still giving enough precision Listing 6-24 Updating the value from scroll wheel movements void CircleBar::wheelEvent( QWheelEvent *event ) { event->accept(); setValue( value() + event->delta()/20 ); }.

Custom widgets consist of two parts: properties visible to the rest of the application (value and setValue) and event handlers (paintEvent and wheelEvent). Almost all custom widgets reimplement the paintEvent method, while the rest of the event handlers to reimplement are picked by determining which are needed to implement the functionality wanted.

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