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When it comes to creating the actions of the main window, the process is fairly similar to that used for the SDI application. The major differences are listed here: The document windows are closed by removing them from the workspace, not by closing the main window containing the document. The actions for the Window menu include tile window, cascade window, next window, and previous window. The actions that are connected directly to the document in the SDI application are connected to the main window in the MDI application. Listing 4-9 shows parts of the createActions method. First, you can see that closeAction is connected to closeActiveWindow() of workspace. Then you can see one of the Window menu items: tileAction. It is connected to the corresponding slot of workspace and causes the workspace to tile all the contained documents so that all can be seen at once. The other actions for arranging the document windows are cascade windows, next window, and previous window. They are set up in the same way as the tile action: simply connect the action s triggered signal to the appropriate slot of the workspace. The next action is the separatorAction, which acts as a separator. Why it is created here will become clear soon. All you need to know now is that it is used to make the Window menu look as expected. Listing 4-9. Creating actions for the MDI application void MdiWindow::createActions() { ... closeAction = new QAction( tr("&Close"), this ); closeAction->setShortcut( tr("Ctrl+W") );

closeAction->setStatusTip( tr("Close this document") ); connect( closeAction, SIGNAL(triggered()), workspace, SLOT(closeActiveWindow()) ); .. tileAction = new QAction( tr("&Tile"), this ); tileAction->setStatusTip( tr("Tile windows") ); connect( tileAction, SIGNAL(triggered()), workspace, SLOT(tile()) ); .. separatorAction = new QAction( this ); separatorAction->setSeparator( true ); .. } It is important to ensure that only the available actions are enabled, which prevents confusion for the user by showing available menu items and toolbar buttons for tasks that aren t valid in the application s current state For instance, you can t paste something when you don t have a document open that makes no sense Thus, the pasteAction action must be disabled whenever you have no active document In Listing 4-10, the method enableActions() is shown alongside the helper method activeDocument() The latter takes the QWidget* return value from QWorkspace::activeWindow and casts it into the handier DocumentWindow* using qobject_cast.

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First, it didn t always work, and the nature of configuration, changing the Windows registry, often failed or worse, broke other applications. ActiveX controls were rarely selfcontained and usually installed runtime support files. Different versions of these support files could easily be installed on top of each other, a common occurrence leading to broken applications (called DLL Hell). The second problem was security. A user s computer, when connected to the Internet, could effectively allow code to run, written by anybody, and the ActiveX technology was fully native, not restricted by the Java or HTML sandboxes (more about these in a moment); therefore, a user could innocently go to a web page that downloaded an ActiveX control that wrought havoc or stole vital information from their system. As such, many users refused to use them, and many corporate administrators even disallowed them from use within the enterprise. The virtual nature of Java and HTML where applications and pages were coded to work on a specific virtual machine offered better security; these machines couldn t do anything malicious,

WorkflowInstance class. Wfinstance can now hold a copy of the WorkflowInstance class that was suspended. Add another line: wfinstance = e.WorkflowInstance Notice that WorkflowInstance is a property of the WorkflowSuspendedEventsArgs class. It represents the workflow instance that was suspended, and everything about that workflow instance. Add one last line of code: wfinstance.resume() The resulting OnWorkflowSuspended is as follows: Shared Sub OnWorkflowSuspended(ByVal sender As Object, ByVal e As WorkflowSuspendedEventArgs) Dim wfinstance As WorkflowInstance wfinstance = e.WorkflowInstance wfinstance.Resume() WaitHandle.Set() End Sub The next step in this example is to add a Code activity to the left IfElse branch. Call this Code activity CodeResume, and add Handlers for ExecutionCode. Within the ExecutionCode sub for CodeResume, add Msgbox("Workflow Resumed"). The completed sub is as follows: Private Sub CodeResume_ExecuteCode(ByVal sender As System.Object, ByVal e As System.EventArgs) MsgBox("Workflow Resumed") End Sub When the workflow is resumed, this Code activity will be executed and the message box will appear. Debug the workflow; the first message box appears when the workflow is suspended and the second when the workflow resumes. The final step in this example is to allow the user to determine what to do next. Add a message box that allows the user to determine if the workflow should be resumed or terminated. Use the following block of code within the OnWorkflowSuspended sub: Shared Sub OnWorkflowSuspended(ByVal sender As Object, ByVal e As WorkflowSuspendedEventArgs) Dim wfinstance As WorkflowInstance wfinstance = e.WorkflowInstance If MsgBox(e.Error & " Do you want to continue ", MsgBoxStyle.YesNo, "Workflow Suspended") = MsgBoxResult.Yes Then wfinstance.Resume() Else wfinstance.Terminate("User Choice") WaitHandle.Set() End If End Sub

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