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menu = menuBar()->addMenu( tr("&File") ); menu->addAction( newAction ); menu->addAction( closeAction ); menu->addSeparator(); menu->addAction( exitAction ); ... windowMenu = menuBar()->addMenu( tr("&Window") ); connect( windowMenu, SIGNAL(aboutToShow()), this, SLOT(updateWindowList()) ); ... } The updateWindowList slot is shown in Listing 4-13. In the slot, the menu is cleared before the predefined actions are added. After that, each window is added as an action, and the first nine windows are prefixed by a number that acts as a shortcut if keyboard navigation is used (the user has pressed Alt+W to reach the Window menu). A Window menu with more than nine documents open is shown in Figure 4-5. Listing 4-13. Updating the Window menu void MdiWindow::updateWindowList() { windowMenu->clear(); windowMenu->addAction( tileAction ); windowMenu->addAction( cascadeAction ); windowMenu->addSeparator(); windowMenu->addAction( nextAction ); windowMenu->addAction( previousAction ); windowMenu->addAction( separatorAction ); int i=1; foreach( QWidget *w, workspace->windowList() ) { QString text; if( i<10 ) text = QString("&%1 %2").arg( i++ ).arg( w->windowTitle() ); else text = w->windowTitle(); QAction *action = windowMenu->addAction( text ); action->setCheckable( true ); action->setChecked( w == activeDocument() ); connect( action, SIGNAL(triggered()), mapper, SLOT(map()) ); mapper->setMapping( action, w ); } }

Figure 4-5. Window menu with more than nine open documents In the foreach loop where the windows are listed, each window is represented by a QAction. These actions are created from a QString and belong to the windowMenu object, which means that the call to clear() first in the slot deletes them properly. The triggered signal from each action is connected to the map() slot of the signal mapping object. The call to setMapping(QObject*, QWidget*) then associates the emitting action with the correct document window. As you remember, the mapped signal from the signal mapping object is connected to the setActiveWindow slot of workspace. The signal mapping object makes sure that the right QWidget* is sent as an argument, with the mapped signal depending on the source of the original signal connected to map. If there were no document windows to add to the list, the separatorAction would be left dangling as a separator with no items under it which is why it s hidden instead of disabled in the enableActions slot.

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In this case, if IntCounter is less than or equal to 1, the workflow will terminate Add a Terminate activity to the right branch of the IfElse condition and call this activity TerminateError View the code for the workflow again and add TerminateErrorError = "Counter<=1" to the New sub just under the SuspendErrorError property assignment This provides a reason for the workflow to be terminated Also, set the default value of IntCounter to 1 The completed Sub New is as follows: Public Sub New() MyBaseNew() InitializeComponent() SuspendErrorError = "counter>1" TerminateErrorError = "Counter<=1" End Sub Open the Modulevb file and find the OnWorkflowTerminated sub, which should already be created by default Replace the consolewriteline with MsgBox(eExceptionMessage) The completed OnWorkflowTerminated looks like the following: Shared Sub OnWorkflowTerminated(ByVal sender As Object, ByVal e As WorkflowTerminatedEventArgs) MsgBox(eExceptionMessage) WaitHandle.

Thus, the pendulum has swung back toward the thin client/fat server approach. Ironically, the thin client is probably fatter than the original servers, because it s an operating system that can support a browser that is extended to support XML (through parsers), scripting (through interpreters), and other plug-ins, as well as Java or .NET virtual machines! With all these runtime elements available to developers and a consistent server-side API (through the .NET Framework or Java server side), rich, high-performing applications built on a client/server model are now fully possible.

The difference between an SDI application and an MDI application is the way the documents are handled. This difference shows clearly in the methods for creating and closing new documents. Starting with the fileNew() slot of the main window shown in Listing 4-14, you can see that the trick is to create a new document window instead of a new main window. As a new window is created, some connections need to be taken care of as well. As soon as the copyAvailable(bool) signal is emitted, the currently active document has lost the selection or has a new selection. This has to be reflected by the copy-and-cut actions and it is what the two connect calls do. When another document is activated, the status enabled by copy-and-cut is managed in the enableActions() slot.

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