/*
 * ImageHolder.h
 *
 *  Created on: Oct 5, 2011
 *      Author: Gapchich Vladislav
 */

#ifndef __IMAGEHOLDER_H__
#define __IMAGEHOLDER_H__

#include <QLabel>

struct BoundingBox {
	QRect rect;
	int label_ID_;
};

struct Polygon {
	QPolygon poly;
	int label_ID_;
};

enum ZoomDirection {
	NoZoom,
	ZoomIn,
	ZoomOut
};

class QListWidgetItem;
class QPixmap;

class ImageHolder : public QLabel
{
	Q_OBJECT
protected:
	void keyPressEvent(QKeyEvent *anEvent);
	void mouseMoveEvent(QMouseEvent *anEvent);
	void mousePressEvent(QMouseEvent *anEvent);
	void mouseReleaseEvent(QMouseEvent *anEvent);
	void paintEvent (QPaintEvent *anEvent);

	void triggerBoundBox(
		const QPoint &aNewPos,
		const QPoint &anOldPos,
		QRect *aNewBox
		);
	void triggerPolygon(
		const QPoint &aPoint,
		QPolygon *aNewPoly
		);
	void drawBoundingBoxes(
		QPainter *aPainter,
		QPen *aPen
		);
	void drawPolygons(
		QPainter *aPainter,
		QPen *aPen
		);

public:
	enum Tool {
		NoTool,
		BoundingBoxTool,
		PolygonTool,
		TaggingTool
	};

	enum State {
		StandBy,
		NewSelection
	};

	ImageHolder(QWidget *aParent = 0);
	virtual ~ImageHolder();

	void setTool(Tool aTool);
	void setBoundingBoxList(QList< BoundingBox > *aBBoxList);
	void setPolygonList(QList< Polygon > *aPolyList);
	void setLabelColorList(QList< uint > *aLabelColorList);
	void setMainLabelNum(int *aNum);
	void setImage(QPixmap *anImage);
	void scaleImage(ZoomDirection aDirection, double scaleFactor);
	State state();
	Tool tool();


public slots:
	void clearAll();
	void clearLast();
	void confirmSelection();
	void focusOnArea(QListWidgetItem *anItem);
	void clearFocusOnArea();
	void undo();
	void redo();

signals:
	void selectionStarted();
	void imageScaled();

private:
	bool repaint_needed_;

	QList< BoundingBox > *list_bounding_box_;
	QList< Polygon > *list_polygon_;
	QList< uint > *list_label_color_;
	QList< QPoint > list_poly_history_;
	QPixmap *image_;
	int *main_label_;
	BoundingBox bounding_box_;
	Polygon polygon_;
	int keyboard_modifier_;

	QPoint prev_cursor_pos_;

	Tool tool_;
	State state_;

	int focused_selection_;
	Tool focused_selection_type_;

	double scale_;
};

#endif /* IMAGEHOLDER_H_ */

/*
 *
 */