#ifndef MANIPULATEOBSERVER_H_
#define MANIPULATEOBSERVER_H_

#include "Device.h"
#include "RadiantSelectionSystem.h"
#include <gdk/gdkevents.h>

/* greebo: This is the class handling the manipulate-related mouse operations, it basically just
 * passes all the mouse clicks back to the SelectionSystem. The callbacks are invoked from
 * RadiantWindowObserver, which is registered in the GlobalWindowObservers list
 */
class ManipulateObserver {
	GdkEventButton* _event;
public:
	DeviceVector _epsilon;
	const View* _view;

	// Updates the internal event pointer
	void setEvent(GdkEventButton* event) {
		_event = event;
	}

	// greebo: Handles the mouseDown event and checks whether a manipulator can be made active
	bool mouseDown(DeviceVector position) {
		return GlobalSelectionSystem().SelectManipulator(*_view, &position[0], &_epsilon[0]);
	}

	/* greebo: Pass the mouse movement to the current selection.
	 * This is connected to the according mouse events by the RadiantWindowObserver class
	 */
	void mouseMoved(DeviceVector position) {
		GlobalSelectionSystem().MoveSelected(*_view, &position[0]);
	}

	// The mouse operation is finished, update the selection and unconnect the callbacks
	void mouseUp(DeviceVector position) {
		// Notify the selectionsystem about the ended operation
		GlobalSelectionSystem().endMove();

		// Unconnect this method from the callbacks
		g_mouseMovedCallback.clear();
		g_mouseUpCallback.clear();
	}

	typedef MemberCaller1<ManipulateObserver, DeviceVector, &ManipulateObserver::mouseMoved> MouseMovedCaller;
	typedef MemberCaller1<ManipulateObserver, DeviceVector, &ManipulateObserver::mouseUp> MouseUpCaller;
};

#endif /*MANIPULATEOBSERVER_H_*/
