first push

filter.h

@@ -0,0 +1,24 @@
+#ifndef FILTER_H
+#define FILTER_H
+
+#include <QObject>
+
+class filter : public QObject
+{
+    Q_OBJECT
+
+private:
+    bool m_ctrlPressed;
+
+public:
+    explicit filter(QObject *parent = 0);
+
+protected:
+    bool eventFilter(QObject *obj, QEvent *ev);
+
+signals:
+    void ctrlPressed();
+    void ctrlReleased();
+};
+
+#endif // FILTER_H