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Working with the Mouse Wheel The mouse wheel is usually considered a part of the mouse, but the event has a separate event object. The object contains the position of the mouse pointer when the event occurs as well as the orientation of the wheel and the size of the scrolling (delta). The event handler is shown in Listing 6-15. The mouse wheel event is first sent to the widget under the mouse pointer. If it is not handled there, it is passed on to the widget with focus. Listing 6-15. The wheel is separate from the rest of the mouse. void EventWidget::wheelEvent( QWheelEvent * event ) { emit gotEvent( QString("wheelEvent( x:%1, y:%2, delta:%3, orientation:%4 )")

<hover> <setProperty target="panel2" property="cssClass" value="hover"/> </hover> <unhover> <setProperty target="panel2" property="cssClass" value="start"/> </unhover> </hoverBehavior> </behaviors> </control> </components> </page> </script> When configuring hover behaviors, you should also configure the unhover event, which will typically return control to its default state if you change it (as in this case) or make any pop-up menus disappear. To configure the hover behavior, you use the <hoverBehavior> tag and set its unHoverDelay attribute to the number of milliseconds you want to wait before the action will take place. The action in this case involves changing the CSS class of the target element when you hover over it, changing its CSS class to hover when you hover over it, and changing its CSS class to start once you leave it: You can see the styles here: <style> .start{background-color:yellow;border:dashed 2px black;} .hover{font-size:40pt;background-color:yellow;border:dashed 2px black;} </style> As you can see from the styles, after hovering over the panel, the font size gets set to 40 points. Returning to the start class removes this and sets the panel to its default view. You can see the effect of the hover behavior in Figure 5-19. You will see an extension to this, allowing for a custom context menu, in the next section. This will demonstrate how you can use the pop-up behavior to generate a clickable pop-up menu that can be used for a linkable tooltip, context menu, or smart tag.

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.arg( event->x() ) .arg( event->y() ) .arg( event->delta() ).arg( event->orientation()==Qt::Horizontal "Horizontal":"Vertical" ) ); } There are more event handlers implemented in the EventWidget class. You can learn a lot about widgets by trying out different things on the widget and then studying the log.

Creating an event filter is easier than inheriting a widget class and overriding an event handling class An event filter is a class inheriting QObject that implements the eventFilter(QObject*, QEvent*) method The method makes it possible to intercept events before they reach their destinations The events can then be filtered (let through or stopped) Event filters can be used to implement many special functions, such as mouse gestures and recognizing key sequences They can be used to enhance widgets or to change a widget s behavior without having to subclass the widget Let s try an event filter that removes any numerical key presses from the event queue The class declaration and implementation is shown in Listing 6-16 The interesting part is the eventFilter method, which has two arguments: a pointer to the destination QObject (dest) and a pointer to the QEvent object (event).

In this example, you will use the hover behavior to trigger the appearance of a context menu that pops up when you hover over a specific word. The context menu will be a list of three hyperlinks. This can be a useful navigational structure where the links are hidden until you need them, instead of them taking up valuable screen real estate when they are not needed. You can see this in action in Figure 5-20.

Figure 1-5. Sequential Workflow design area To further prepare for 2 and creating your first workflow projects, create a new State Machine workflow console application called VBFirstStateMachineWFConsoleApplication, and a State Machine Library called VBFirstStateMachineWFLibrary. When you open the projects, you ll notice the same differences in the Solution Explorer between the console application and the library. Also compare the Toolbox of a State Machine workflow to that of a Sequential workflow project. A few differences will be discussed and shown in 2. Finally, notice that the design area is different for the State Machine workflow, as shown in Figure 1-6. There s no starting point, just a container for the first state.

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