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

YACReaderLibrary/comics_view_transition.h

@@ -0,0 +1,17 @@
+#ifndef COMICS_VIEW_TRANSITION_H
+#define COMICS_VIEW_TRANSITION_H
+
+#include <QWidget>
+
+class ComicsViewTransition : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit ComicsViewTransition(QWidget *parent = 0);
+    QSize sizeHint();
+
+protected:
+    void paintEvent(QPaintEvent *);
+};
+
+#endif // COMICS_VIEW_TRANSITION_H