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The qobject_cast function uses the type information available for all QObjects and descending classes to provide typesafe casting If the requested cast can t be made, 0 is returned The activeDocument method returns NULL (or 0) if there is no active window or if the active window is not the DocumentWindow type It is used in the enableActions method Two Boolean values are used to make the code easier to read: hasDocuments and hasSelection If the workspace has an active document of the right type, most items are enabled, and the separatorAction is visible The copy-and-cut actions require not only a document but also a valid selection, so they are enabled only if hasSelection is true Listing 4-10.

Enabling and disabling actions DocumentWindow *MdiWindow::activeDocument() { return qobject_cast<DocumentWindow*>(workspace->activeWindow()); } void MdiWindow::enableActions() { bool hasDocuments = (activeDocument() != 0 ); closeAction->setEnabled( hasDocuments ); pasteAction->setEnabled( hasDocuments ); tileAction->setEnabled( hasDocuments ); cascadeAction->setEnabled( hasDocuments ); nextAction->setEnabled( hasDocuments ); previousAction->setEnabled( hasDocuments ); separatorAction->setVisible( hasDocuments );.

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and therefore applications written to run on them also couldn t. The user was effectively safe, though limited in the scope of what they could do. At the end of the 1990s, Microsoft unveiled the successor to ActiveX (among others) in its Java-like .NET Framework. This framework would form Microsoft s strategic positioning for many years. Like Java, it provided a virtual machine (the common language runtime [CLR]) on which applications would run. These applications could do only what the CLR allowed and were called managed applications. The .NET Framework was much more sophisticated than the Java virtual machine, allowing for desktop and web applications with differing levels of functionality (depending on which was used). This was part of managing the code. With the .NET Framework came a new language, C#, but this wasn t the only language that could be used with .NET it was a multilanguage, single-runtime platform that provided great flexibility. The .NET Framework was revolutionary because it united the client-application experience and connected-application experience across a unified runtime, which ActiveX tried but ultimately failed to do. Because the same platform could be written for both, the result was that the user experience would be similar across both (see Figure 1-7). Coupled with the emergence of Extensible Markup Language (XML), a language similar to HTML but specialized for handling data instead of presentation, web application development was finally coming of age.

bool hasSelection = hasDocuments && activeDocument()->textCursor().hasSelection(); cutAction->setEnabled( hasSelection ); copyAction->setEnabled( hasSelection ); } The helper function activeDocument is used in several places. One example passes the signals from the main window to the actual document window. The functions for doing this are shown in Listing 4-11. All QActions such as menu items and toolbar buttons must be passed through the main window like this when building an MDI-based application. Listing 4-11. Passing signals from the main window to the document widget void MdiWindow::editCut() { activeDocument()->cut(); } void MdiWindow::editCopy() { activeDocument()->copy(); } void MdiWindow::editPaste() { activeDocument()->paste(); }

Notice the Terminate method call Again, in this example Terminate is a method of the WofkflowInstance class This isn t the Terminate activity, but just a method This method terminates the workflow, and is the same as the Terminate activity that you ll add later Debug the workflow again, and when prompted say Yes to resume the workflow You ll see the workflow resumed message box If you execute the workflow again and choose No, the workflow will terminate This ability to resume a workflow from the point it stopped can be important If there s an error within a workflow and the user can make a choice and resume the workflow, this is better than having the workflow terminate However, you can choose to terminate a workflow if a condition is either met or not met.

Closely related to enabling and disabling actions is the functionality to handle the Window menu. The Window menu (refer to Figure 4-4) enables the user to arrange document windows and switch between different documents. Listing 4-12 shows how menus are created. All menus except the Window menu are created by putting the actions in them, just as in the SDI application. The Window menu is different because it changes as documents are opened and closed over time. Since you need to be able to alter it, a pointer to it called windowMenu is kept in the class. Instead of adding actions to the menu, now the signal aboutToShow() from the menu is connected to the custom slot updateWindowList() that populates the menu. The aboutToShow signal is emitted just before the menu is shown to the user, so the menu always has valid contents. Listing 4-12. Creating the Window menu void MdiWindow::createMenus() { QMenu *menu;

Figure 1-7. The .NET Framework provides consistent browser, desktop, and server application programming interfaces (APIs).

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