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keyReleaseEvent. You usually cannot rely on seeing the keyReleaseEvent the user might move the focus between widgets (using the mouse) before releasing the key. If you need to ensure that your widget gets all keyboard events, use the grabKeyboard and releaseKeyboard methods. When a widget grabs the keyboard, all key events are sent to it regardless of which widget currently has the focus. The event handler in the listing shows modifier keys and the text of the pressed key. The modifiers are stored as a bit mask, and several can be active at once. Listing 6-12. A keyboard event handling method void EventWidget::keyPressEvent( QKeyEvent * event ) { emit gotEvent( QString("keyPressEvent( text:%1, modifiers:%2 )") .arg( event->text() ) .arg( event->modifiers()==0 tr("NoModifier"):( (event->modifiers() & Qt::ShiftModifier ==0 tr(""): tr("ShiftModifier "))+ (event->modifiers() & Qt::ControlModifier ==0 tr(""): tr("ControlModifier "))+ (event->modifiers() & Qt::AltModifier ==0 tr(""): tr("AltModifier "))+ (event->modifiers() & Qt::MetaModifier ==0 tr(""): tr("MetaModifier "))+ (event->modifiers() & Qt::KeypadModifier ==0 tr(""): tr("KeypadModifier "))+ (event->modifiers()&Qt::GroupSwitchModifier ==0 tr(""): tr("GroupSwitchModifier")) ) ) ); }

The context menu event is triggered when the user tries to bring up a context menu (the menu that appears when right-clicking on something usually offering actions such as cut, copy, and paste). This event can be triggered with both the mouse and the keyboard. The event object contains the source of the request (reason) and the coordinates of the mouse pointer when the event occurs. The handler is shown in Listing 6-13. If a context menu event is ignored, it is reinterpreted and sent as a mouse event, if possible. All event objects carrying the mouse position have the pos() and globalPos() methods. The pos method is the position in widget-local coordinates, which is good for updating the widget itself. If you want to create a new widget at the location of the event, you need to use the global coordinates instead. The positions consist of x and y coordinates, which can be obtained directly from the event object through the x, y, globalX, and globalY methods. Listing 6-13. A context menu has been requested. void EventWidget::contextMenuEvent( QContextMenuEvent * event ) { emit gotEvent( QString("contextMenuEvent( x:%1, y:%2, reason:%3 )")

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The HTML for this page is here: <div class="description"> <h3><u>Example 9: Hover behavior</u></h3> <div id="panel2">This element is associated to the hoverBehavior.</div> </div> As you can see, it is straightforward. You simply create a <div> element on the page and enter the text into it. In this example, you will change the style of this element when you hover over it for 500 milliseconds. To achieve this, you can use Atlas Script to define the client-side controls and their associated behaviors: <script type="text/xml-script"> <page xmlns:script="http://schemas.microsoft.com/xml-script/2005"> <components> <control targetElement="panel2" cssClass="start"> <behaviors> <hoverBehavior unhoverDelay="500">

.arg(event->x()) .arg(event->y()) .arg(event->reason()==QContextMenuEvent::Other "Other" : (event->reason()==QContextMenuEvent::Keyboard "Keyboard" : "Mouse")) ); } The context menu event carries the mouse position, as does the QMouseEvent. The mouse events are mousePressEvent, mouseReleaseEvent, mouseMoveEvent, and mouseDoubleClickEvent. You can see the latter in Listing 6-14. The handler shows the button as well as the x and y coordinates. When dealing with mouse events, it is important to understand that the movement event is sent only as long as a mouse button is pressed. If you need to get the movement event at all times, you must enable mouse tracking with the mouseTracking property. If you want to get all the mouse events, you can use the mouse just as you can use the keyboard. Use the methods grabMouse() and releaseMouse() for this. Just be careful because a bug occurring while the mouse is grabbed can prevent mouse interaction for all applications. The rule is to grab only when necessary, to release as soon as possible, and to never ever forget to release the mouse. Listing 6-14. A mouse event handling method void EventWidget::mouseDoubleClickEvent( QMouseEvent * event ) { emit gotEvent( QString("mouseDoubleClickEvent( x:%1, y:%2, button:%3 )") .arg( event->x() ) .arg( event->y() ) .arg( event->button()==Qt::LeftButton "LeftButton": event->button()==Qt::RightButton "RightButton": event->button()==Qt::MidButton "MidButton": event->button()==Qt::XButton1 "XButton1": "XButton2" ) ); }

Figure 1-4. Sequential Workflow Console Application in the Solution Explorer The Toolbox within VS2005 for a workflow project is different from a typical project using the selected language. Instead of controls such as text boxes or grid views , the Toolbox contains a control for each of the activities from the WF Basic Activity Library (the out-of-the-box activities). The formal design area is where the controls from the Toolbox will be placed. The design area is the area with the Sequential workflow starting point already defined, waiting for the next activity to be placed next in the flow, as shown in Figure 1-5.

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