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By checking whether the event is a key press event using type, you know that the event pointer can be cast to a QKeyEvent pointer The QKeyEvent class has the text method that you use to determine whether the key pressed is a number If the key press is from a numerical key, true is returned, indicating that the filter handled the event This stops the event from reaching the destination object For all other events, the value of the base class implementation is returned, which will result in either handling the event by the base class filter or letting it pass through the final destination object Listing 6-16 The event filtering class KeyboardFilter stops key presses for numeric keys.

class KeyboardFilter : public QObject { public: KeyboardFilter( QObject *parent = 0 ) : QObject( parent ) {} protected: bool eventFilter( QObject *dist, QEvent *event ) { if( event->type() == QEvent::KeyPress ) { QKeyEvent *keyEvent = static_cast<QKeyEvent*>( event ); static QString digits = QString("1234567890"); if( digitsindexOf( keyEvent->text() ) != -1 ) return true; }.

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To better understand how this is implemented, let s take a look at the source code. This is the HTML for the page: <form id="form1" runat="server"> <atlas:ScriptManager runat="server" ID="ScriptManager1"> <Scripts> <atlas:ScriptReference ScriptName="AtlasUIDragDrop" /> </Scripts> </atlas:ScriptManager> <div class="description"> <hr /> <h3><u>Example 10: Pop-up component and hover behavior</u></h3> The following example demonstrates the pop-up menu that will appear when the mouse hovers over the highlighted element. You can use it to implement a custom menu for multiple hyperlinks on an element: <p></p> A terrific resource for technical information is the <a id="hoverLink" class="hoverlabel">Microsoft</a> family of web sites <div id="popup" style="visibility:hidden;display:none;border:solid 1px black; background-color:lightyellow;filter:alpha(opacity=80);">

return QObject::eventFilter(dist, event); } }; To test the event filter, you can install it on a QLineEdit (its source code is shown in Listing 6-17). The QLineEdit and KeyboardFilter objects are created like any other objects. Then the installEventFilter(QObject*) is used to install the filter on the line edit before the editor is shown. Listing 6-17. To use an event filter, you must install it on a widget. The events to that widget are then passed through the filter. int main( int argc, char **argv ) { QApplication app( argc, argv ); QLineEdit lineEdit; KeyboardFilter filter; lineEdit.installEventFilter( &filter ); lineEdit.show(); return app.exec(); } Try using the line edit. The key presses are filtered, but numbers can still be forced into the editor by using the clipboard. You must be careful when implementing and applying event filters there might be hard-to-foresee side effects. If you are careful when designing your filters you can enhance applications by filtering, reacting to, and redirecting events making interaction easier for the user. An example is to catch keyboard events in a draw area, redirecting them to a text editor, and moving the focus. This saves the user from clicking the text editor before entering text, making the application more user-friendly.

Figure 1-6. State Machine workflow design area Close all the projects that are open. The final project to create is the Workflow Activity Library project. Call this project VBFirstWorkflowActivityLibrary. When you open this project, again you ll notice a different design area, as shown in Figure 1-7. This design area allows you to create new activities from the existing out-of-the-box activities. These are called composite activities. The Workflow Activity Library project is similar to creating a class library. This allows you to customize existing activities and create your own, to be reused within other projects.

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