* A mouse shake detecting BMessageFilter that's easily integrated in any app.

* A test app for it. I added a src/test/kits/shared folder as i found it was the
 most logical place for it. Shake it up.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32602 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/shared/ShakeTrackingFilter.h

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2009, Alexandre Deckner, [email protected]
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef SHAKE_TRACKING_FILTER_H
+#define SHAKE_TRACKING_FILTER_H
+
+
+#include <MessageFilter.h>
+#include <Point.h>
+
+class BView;
+class BHandler;
+class BMessageRunner;
+
+namespace BPrivate {
+
+class LowPassFilter {
+public:
+						LowPassFilter(uint32 size);
+						~LowPassFilter();
+
+			void	    Input(const BPoint& p);
+			BPoint		Output() const;
+private:
+	BPoint* fPoints;
+	uint32	fSize;
+	BPoint	fSum;
+};
+
+
+class ShakeTrackingFilter : public BMessageFilter {
+public:
+								ShakeTrackingFilter(
+									BView* targetView,
+									uint32 messageWhat,
+									uint32 countThreshold = 2,
+									bigtime_t timeTreshold = 400000);
+
+								~ShakeTrackingFilter();
+
+			filter_result		Filter(BMessage* message, BHandler** _target);
+
+private:
+			BView*				fTargetView;
+			uint32				fMessageWhat;
+
+			BMessageRunner*		fCancelRunner;
+			LowPassFilter		fLowPass;
+			BPoint				fLastDelta;
+			BPoint				fLastPosition;
+			uint32				fCounter;
+			uint32				fCountThreshold;
+			bigtime_t			fTimeThreshold;
+};
+
+}	// namespace BPrivate
+
+using BPrivate::ShakeTrackingFilter;
+using BPrivate::LowPassFilter;
+
+#endif	// SHAKE_TRACKING_FILTER_H