Code required to fix #80. Additional configuration modifications required to take advantage of new feature.

src/typica.w

 |restoreSizeAndPosition()| and |saveSizeAndPosition()| methods should be
 considered depreciated.
 
+Version 1.6 adds a new property for handling the |windowModified| property
+such that an appropriate prompt is provided to confirm or cancel close events.
+
 @<Class declarations@>=
 class ScriptQMainWindow : public QMainWindow@/
 {@t\1@>@/
 	Q_OBJECT@;@/
+	Q_PROPERTY(QString closePrompt READ closePrompt WRITE setClosePrompt)@;@/
 	public:@/
-		ScriptQMainWindow();@/
+		ScriptQMainWindow();
+		QString closePrompt();@/
 	@t\4@>public slots@t\kern-3pt@>:@/
 		void show();
 		void saveSizeAndPosition(const QString &key);
 		void restoreSizeAndPosition(const QString &key);
-		void displayStatus(const QString &message = QString());@/
+		void displayStatus(const QString &message = QString());
+		void setClosePrompt(QString prompt);@/
 	protected:@/
 		void closeEvent(QCloseEvent *event);
 		void showEvent(QShowEvent *event);@/
 	signals:@/
 		void aboutToClose(void);@t\2@>@/
+	private:@/
+		QString cprompt;
 }@t\kern-3pt@>;
 
 @ The implementation of these functions is simple.
 
 @<Functions for scripting@>=
-ScriptQMainWindow::ScriptQMainWindow()@+: QMainWindow(NULL)@/
+ScriptQMainWindow::ScriptQMainWindow()@+: QMainWindow(NULL),
+	cprompt(tr("Closing this window may result in loss of data. Continue?"))@/
 {
 	/* Nothing needs to be done here. */
 }
 	QMainWindow::show();
 }
 
+@ When a close event occurs, we check the |windowModified| property to
+determine if closing the window could result in loss of data. If this is
+true, we allow the event to be cancelled. Otherwise, a signal is emitted which
+allows scripts to perform any cleanup that may be required before closing the
+window and the window geometry data is saved before allowing the window to
+close.
+
+@<Functions for scripting@>=
 void ScriptQMainWindow::closeEvent(QCloseEvent *event)
 {
+	if(isWindowModified()) {
+		@<Allow close event to be cancelled@>@;
+	}
 	emit aboutToClose();
 	@<Save window geometry@>@;
 	event->accept();
 }
 
+@ The prompt text for our confirmation window is provided through the
+|closePrompt| property.
+
+@<Allow close event to be cancelled@>=
+QMessageBox::StandardButton result;
+result = QMessageBox::warning(this, "Typica", closePrompt(),
+                              QMessageBox::Ok | QMessageBox::Cancel);
+if(result == QMessageBox::Cancel)
+{
+	event->ignore();
+	return;
+}
+
+@ Implementation of the |closePrompt| property is trivial.
+
+@<Functions for scripting@>=
+QString ScriptQMainWindow::closePrompt()
+{
+	return cprompt;
+}
+
+void ScriptQMainWindow::setClosePrompt(QString prompt)
+{
+	cprompt = prompt;
+}
+
 @ Window geometry management from version 1.4 on makes use of the window ID to
 produce an appropriate QSettings key. This decision relies on the ID being set
 before any show or close events are received and it relies on every distinct