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The parent parameter specifies the parent widget. The default is a null pointer, meaning that the dialog has no parent. 13 signals: 14 void findNext(const QString &str, Qt::CaseSensitivity cs); 15 void findPrevious(const QString &str, Qt::CaseSensitivity cs); The signals section declares two signals that the dialog emits when the user clicks the Find button. If the Search backward option is enabled, the dialog emits findPrevious(); otherwise, it emits findNext(). The signals keyword is actually a macro.

The function is declared in QObject and every subclass that contains the Q_OBJECT macro. It's a good habit to surround user-visible strings with TR(), even if you don't have immediate plans for translating your applications to other languages. Translating Qt applications is covered in Chapter 17. In the string literals, we use ampersands ('&') to indicate shortcut keys. For example, line 11 creates a Find button, which the user can activate by pressing Alt+F on platforms that support shortcut keys.

Shape-Changing Dialogs We have seen how to create dialogs that always show the same widgets whenever they are used. In some cases, it is desirable to provide dialogs that can change shape. The two most common kinds of shapechanging dialogs are extension dialogs and multi-page dialogs. Both types of dialog can be implemented in Qt, either purely in code or using Qt Designer. Extension dialogs usually present a simple appearance but have a toggle button that allows the user to switch between the dialog's simple and extended appearances.

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