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In the SDI application, possible user actions are divided between the document, the main window, and the application. The same is valid for the MDI application, except that all events for the document must pass through the main window because the main window must decide which document widget to pass the event to. Let s start with a look at the document widget class. You can see the class definition in Listing 4-6. Listing 4-6. Document widget class for the MDI application class DocumentWindow : public QTextEdit { Q_OBJECT public: DocumentWindow( QWidget *parent = 0 ); protected: void closeEvent( QCloseEvent *event ); bool isSafeToClose(); }; The document class in an MDI application can be compared with a slim version of the SDI application s main window. All that it contains are the specifics for the document, so it entails stripping all application global code as well as functions for creating new documents. The class inherits the QTextEdit class and gets the same interface. The isSafeToClose and closeEvent methods interact just as in the SDI example, while the constructor looks slightly different. Listing 4-7 shows the constructor, which tells Qt to delete the document window as

<button targetElement="cursorButton"> <click> <invokeMethod target="panel" method="toggleCssClass"> <parameters className="special" /> </invokeMethod> <setProperty target="cursorLabel" property="text" value="Cursor set" /> <setProperty target="cursorButton" property="enabled" value="true" /> </click> </button> <label targetElement="cursorLabel" text="Regular cursor" /> </components> </page> </script>

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WaitOne() End Sub Now that the Handler is in place, start debugging the workflow again Again, you ll see the workflow move through the Delay1 activity, to the IfElse activity, and finally to the Suspend activity The message box then appears but has no contents This is because the Error property of the WorkflowSuspendedEventsArgs class must be set To set this property, you have to provide a value to the Error property of the Suspend activity Stop the debugging and return to the code of the workflow Within the Sub New, add the following line: SuspendErrorError = "counter>1" This line sets the Error property of the SuspendError activity and lets the user know the reason the workflow is suspended is that counter is greater than 1 The resulting Sub New is as follows: Public Sub New() MyBaseNew() InitializeComponent() SuspendError.

soon as it has been closed before setting the title and making the connection between the modification status of the document and the windowModified property of the document window itself Listing 4-7 Constructor of the document widget class DocumentWindow::DocumentWindow( QWidget *parent ) : QTextEdit( parent ) { setAttribute( Qt::WA_DeleteOnClose ); setWindowTitle( QString("%1[*]" )arg("unnamed") ); connect( document(), SIGNAL(modificationChanged(bool)), this, SLOT(setWindowModified(bool)) ); } That s all there is to the document window simply setting a title and setting up a connection to let Qt indicate whether the document has been modified Again, the method of adding unnamed to the window title using the arg method gives the translator more freedom when it comes to adapting the text The [*] part of the window title is used by Qt to show or hide an asterisk to indicate whether the file has been modified Let s move on to the main window.

It is shown in Listing 4-8 and looks very much like the rest of the SDI application s constructor with one small addition The highlighted lines in the listing show how a QWorkspace is created and set as the central widget of the main window A workspace is a widget that treats all widgets put in it as MDI children (Refer to Figure 4-3 the two documents are widgets put inside the workspace) Next, the signal windowActivated from the workspace is connected to enableActions of the main window The windowActivated signal is emitted as soon as the currently active window is changed, either because the user changed documents or because the user closed the last document Either way, you have to make sure that only the relevant actions are enabled (You ll return to this soon) Listing 4-8.

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