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toolbar = addToolBar( tr("File") ); toolbar->addAction( newAction ); ... } Refer to Listing 4-1 again you will see that after the actions have been added to the menus and toolbars, the final call in the constructor creates a status bar and displays the message "Done" in it. The statusBar() method works just like menuBar(): the bar is created and returned at the first call and then a pointer to it is returned in subsequent calls.

You will use the QTextEdit class as your document class because it contains all the functionality you need. It can handle creating and editing text, as well as copying and pasting to and from the clipboard. This leaves you with only the tasks of implementing the functionality for creating new documents and closing any open documents. Creating new documents is easy. All it takes is bringing up a new main window the constructor shown in Listing 4-1 will do all the hard work. Listing 4-4 shows the trivial implementation of the fileNew() slot. It creates a new window and then shows it. Listing 4-4. Creating a new document void SdiWindow::fileNew() { (new SdiWindow())->show(); } Closing documents is more complex because a document (or the window containing a document) can be closed in many different ways. One possible cause is the window manager telling the window to close for various reasons. For example, perhaps the user is trying to close the window by clicking the close button in the title bar. Or the computer is shutting down. Or the user is choosing Exit or Close from the File menu of the application. To intercept all these user actions that end up in attempts to close the current window, you can implement an event handler for the close event by overriding the closeEvent(QCloseEvent*) method. Listing 4-5 shows the SDI application implementation. Listing 4-5. Closing a document void SdiWindow::closeEvent( QCloseEvent *event ) { if( isSafeToClose() ) event->accept(); else event->ignore(); } bool SdiWindow::isSafeToClose() { if( isWindowModified() )

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Another style you can change on the <div> element is the cursor that is used when the mouse hovers over it. You can do this in this example with a click of the button to toggle it between the default cursor and a hand cursor. The label indicates the status of the current cursor. You ll now look at how these controls are initialized. First the button you set this up by constructing a Sys.UI.Button control with cursorButton, which is the ID of the underlying HTML control: // Set up the buttons, and attach the click event var btnCursor = new Sys.UI.Button($('cursorButton')); btnCursor.initialize(); btnCursor.click.add(onCursorButtonClick); Then you assign the onCursorButtonClick function as the delegate event for when the user clicks the button. This function looks like this: function onCursorButtonClick() { if (g_panel.containsCssClass('special')) { g_panel.removeCssClass('special'); g_label.set_text("Regular cursor"); } else { g_panel.addCssClass('special'); g_label.set_text("Hand pointer cursor"); } }

{ switch( QMessageBox::warning( this, tr("SDI"), tr("The document has unsaved changes.\n" "Do you want to save it before it is closed "), QMessageBox::Discard | QMessageBox::Cancel ) ) { case QMessageBox::Cancel: return false; default: return true; } } return true; } You can choose to accept() or ignore() an event: ignoring a close event leaves the window open, and accepting it closes the window. To ensure that it is safe to close the window, use the isSafeToClose method, which ascertains whether the document has been modified using isWindowModified(). If the document hasn t been modified, it is safe to close it. If the document has been modified, ask the user whether it is okay to discard the changes using a QMessageBox.

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