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Figure 4-4. Workflow with Delay and Suspend activities Add a breakpoint to the Delay1 activity and debug the workflow. You ll notice the Delay1 activity is executed, and the workflow pauses for 30 seconds. Then the left branch of the IfElse activity is executed, because that s the branch whose condition is True. Finally, the SuspendError activity is executed. However, notice that nothing happens. The console application remains open, and so does the workflow. The Suspend activity paused the workflow; however, the workflow doesn t know what to do when it s suspended. A little more coding is involved to make the Suspend activity work, so stop the debugging of the workflow. Open the Module1.vb file to open the code for the console application. Find the line of code that creates a new instance of the WorkflowRuntime class: Dim workflowRuntime As New WorkflowRuntime()) Right-click WorkflowRuntime() and choose Go To Definition to open the Object Browser. This takes you to the object model for the WorkflowRuntime class. If you scroll down the right side of the Object Browser, you ll see events such as WofkflowStarted, WorkflowSuspended, and WorkflowTerminated. These are all events that can be raised within the WorkflowRuntime class. Now you need to add code to Module1 to handle the WorkflowSuspended event, so when the event is raised the workflow runtime will know what actions to perform. Add the following sub to handle the WorkflowSuspended event: Shared Sub OnWorkflowSuspended(ByVal sender As Object, ByVal e As WorkflowSuspendedEventArgs) Msgbox(e.Error) WaitHandle.Set() End Sub

The close event can have several sources: the user might have clicked Close or Exit from the File menu, or the user might have closed the window by using features of the current platform. If the close event s source is the application exiting, an ignored close event means that no more windows will be closed. The user cancels the entire process of exiting, not just the closing of the current window, which makes it possible to cancel the entire closing-down process of the entire application using the Cancel button of the QMessageBox shown from a single document In 8, you will learn that it is really easy to integrate saving changes at close if you extend the isSafeToClose method. The structure looks unnecessarily complex now because you need to be able to handle the save before closing option as well.

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This example was a simple one, showing how you can manipulate CSS classes on the underlying controls by using the various methods available to Atlas client-side controls. In addition, you saw how event delegates can be added to controls to allow for complex functionality to be performed upon an event. As you work through this chapter, I will expand on this example to show you how to achieve more sophisticated functionality.

To create from the SdiWindow class, you need to provide a trivial main function that initializes a QApplication object before creating and showing an SdiWindow. The application then runs by itself, creating new windows for new documents and finishing when all documents have been closed. To build it, you also have to create a project file using the file created from running qmake -project is enough. Then simply run qmake followed by make to compile and link the application.

To compare the SDI and MDI approaches and learn about their differences, you will create an MDI application based on the same theme used in the previous section. A screenshot of the application is provided in Figure 4-3.

Notice the eError parameter to the message box Reason is a property of the WorkflowSuspendedEventsArgs class, and can be used to provide a reason for the workflow being suspended This sub displays to the user the reason the workflow was suspended However, first the workflow runtime must know that this sub is going to handle the WorkflowSuspended event To do this, add the following code within the Main sub after the other AddHandler statement: AddHandler workflowRuntimeWorkflowSuspended, AddressOf OnWorkflowSuspended This line of code tells the WorkflowRuntime class that there s a Handler called OnWorkflowSuspended, which should be executed when the WorkflowSuspended event of the WorkflowRuntime class is raised The resulting Sub Main is as follows: Shared Sub Main() Dim workflowRuntime As New WorkflowRuntime() AddHandler workflowRuntimeWorkflowCompleted, AddressOf OnWorkflowCompleted AddHandler workflowRuntimeWorkflowTerminated, AddressOf OnWorkflowTerminated AddHandler workflowRuntimeWorkflowSuspended, AddressOf OnWorkflowSuspended Dim workflowInstance As WorkflowInstance workflowInstance = workflowRuntimeCreateWorkflow(GetType(Workflow1)) workflowInstanceStart() WaitHandle.

You can achieve the same functionality using Atlas Script instead of JavaScript. In this case, the same HTML is used, but the following XML-based Atlas Script is used instead of the JavaScript code you saw earlier: <script type="text/xml-script"> <page xmlns:script="http://schemas.microsoft.com/xml-script/2005"> <components> <control targetElement="panel" cssClass="normal"> <bindings> <binding id="setCss" dataContext="colorSelect" dataPath="selectedValue" property="cssClass" /> </bindings> </control> <select targetElement="colorSelect"> <selectionChanged> <invokeMethod target="setCss" method="evaluateIn" /> </selectionChanged> </select>

In the application, each document is given a smaller window inside the main window, which is implemented using a document widget class and a QWorkspace. The workspace is the area that contains all the document windows. From the user s viewpoint, the MDI application is identical to the SDI application, except for the Window menu shown in Figure 4-4, which makes it possible to arrange the document windows and to move to a document other than the currently active document.

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