Add a method to ExtractDelegate for querying if the extraction has been cancelled.

custom_widgets/help_about_dialog.h

@@ -0,0 +1,28 @@
+#ifndef HELP_ABOUT_DIALOG_H
+#define HELP_ABOUT_DIALOG_H
+
+#include <QDialog>
+
+class QTabWidget;
+class QTextBrowser;
+
+class HelpAboutDialog : public QDialog
+{
+Q_OBJECT
+public:
+	HelpAboutDialog(QWidget * parent=0);
+	HelpAboutDialog(const QString & pathAbout,const QString & pathHelp,QWidget * parent =0);
+	~HelpAboutDialog();
+public slots:
+	void loadAboutInformation(const QString & path);
+	void loadHelp(const QString & path);
+
+private:
+	QTabWidget *tabWidget;
+	QTextBrowser *aboutText;
+	QTextBrowser *helpText;
+	QString fileToString(const QString & path);
+};
+
+
+#endif // HELP_ABOUT_DIALOG_H