UML_Editor/CompositionLine.java at main · wei-juncheng/UML_Editor · GitHub

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public class CompositionLine extends MainButton {

	public CompositionLine(String button_name, GUI m) {
		super(button_name, m);
		// TODO Auto-generated constructor stub
	}

	public void CanvasPressEvent(int x, int y, MainObject obj) {
		System.out.println("Press!");
		MainObject.connection_port  nearest_port = obj.get_nearest_port(x, y);
		ObjectCompositionLine ass_line = new ObjectCompositionLine(obj, nearest_port);
		//滑鼠還在拖曳時，先加進temp_line，等release時再加進ass_line

//		main_GUI.canvas_area.line.add(ass_line);
		main_GUI.canvas_area.temp_line = ass_line;

	}

	public void CanvasEnterEvent(int x, int y, MainObject obj) {
		System.out.println("Enter!");
		System.out.println("CanvasMoveEvent X:"+x+" Y:"+y);

		//當滑鼠按住拖曳時，進入其他物件
		if(main_GUI.canvas_area.pressed_obj!=null && main_GUI.canvas_area.pressed_obj != obj) {
			System.out.println("滑鼠按住拖曳時，進入其他物件");
			main_GUI.canvas_area.entered_obj = obj;
			System.out.println("Enter another oject and create line");
			//給他終點就可以產生線段了
			main_GUI.canvas_area.temp_line.end_obj = obj;
			main_GUI.canvas_area.temp_line.end_port = obj.get_nearest_port(x, y);
		}else if(main_GUI.canvas_area.pressed_obj!=null && main_GUI.canvas_area.pressed_obj == obj && main_GUI.canvas_area.temp_line.end_obj != null){
			// 進入原本的物件，association線段將不會建立
			//把終點拿掉，他就不會畫線段了
			main_GUI.canvas_area.temp_line.end_obj = null;
			main_GUI.canvas_area.temp_line.end_port = null;
		}

	}

	public void CanvasReleaseEvent(int x, int y , MainObject obj) {

		//當按住滑鼠拖曳，且mouse release的時候進入其他物件，則畫線
		if(main_GUI.canvas_area.pressed_obj!=null && main_GUI.canvas_area.entered_obj!=null) {
			main_GUI.canvas_area.line.add(main_GUI.canvas_area.temp_line);
		}
		main_GUI.canvas_area.temp_line = null;
		main_GUI.canvas_area.entered_obj = null;
		main_GUI.canvas_area.pressed_obj = null;
	}

	public void CanvasExitEvent(int x, int y , MainObject obj) {

		//當按住滑鼠拖曳 離開某物件，且這個物件不是當初press的那一個
		if(main_GUI.canvas_area.pressed_obj!=null &&  obj != main_GUI.canvas_area.pressed_obj) {
			//歸零
			main_GUI.canvas_area.entered_obj = null;

			//把終點拿掉，他就不會畫線段了
			main_GUI.canvas_area.temp_line.end_obj = null;
			main_GUI.canvas_area.temp_line.end_port = null;
		}

	}

}