| gvSIG desktop 1

/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2007 IVER T.I. and Generalitat Valenciana.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 */

package org.gvsig.raster.beans.canvas;

import java.awt.Color;

import java.awt.Cursor;

import java.awt.Graphics;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.awt.event.MouseMotionListener;

import java.util.ArrayList;

import java.util.Iterator;

import javax.swing.JPanel;

/**

 * Canvas donde se pintan objetos GLine

 * 14-oct-2007

 * @author Nacho Brodin (nachobrodin@gmail.com)

 */

public class GCanvas  extends JPanel implements MouseListener, MouseMotionListener {

        private static final long   serialVersionUID = 5431466034535083594L;

        private Color               backgroundColor = Color.WHITE;

        private ArrayList           drawableElements = new ArrayList();

        public static final int     DEFAULT_CURSOR = Cursor.DEFAULT_CURSOR;

        private boolean hasMouse = false;

        // Tama?o de los bordes para el canvas

        private int               borderX1               = 0;

        private int               borderX2               = 0;

        private int               borderY1               = 0;

        private int               borderY2               = 0;

        private ArrayList           actionCommandListeners = new ArrayList();

        /**

         * Contructor.Inicializa el objeto asignando color de fondo. Considera que el objeto

         * GLine ya tiene su color asignado.

         * @param line Objeto l?nea

         * @param backgroundColor

         */

        public GCanvas(Color backgroundColor) {

                this.backgroundColor = backgroundColor;

                addMouseListener(this);

                addMouseMotionListener(this);

        }

        public void addBorder(int x1, int y1, int x2, int y2) {

                borderX1 += x1;

                borderX2 += x2;

                borderY1 += y1;

                borderY2 += y2;

        }

        /**

         * A?adir un listener a la lista de eventos

         * @param listener

         */

        public void addValueChangedListener(IGCanvasListener listener) {

                if (!actionCommandListeners.contains(listener))

                        actionCommandListeners.add(listener);

        }

        /**

         * Borrar un listener de la lista de eventos

         * @param listener

         */

        public void removeValueChangedListener(IGCanvasListener listener) {

                actionCommandListeners.remove(listener);

        }

        /**

         * Invocar a los eventos asociados al componente

         */

        public void callDataChanged(String key, Object value) {

                Iterator iterator = actionCommandListeners.iterator();

                while (iterator.hasNext()) {

                        IGCanvasListener listener = (IGCanvasListener) iterator.next();

                        listener.actionDataChanged(new GCanvasEvent(this, key, value));

                }

        }

        /**

         * Invocar a los eventos asociados al componente

         */

        public void callDataDragged(String key, Object value) {

                Iterator iterator = actionCommandListeners.iterator();

                while (iterator.hasNext()) {

                        IGCanvasListener listener = (IGCanvasListener) iterator.next();

                        listener.actionDataDragged(new GCanvasEvent(this, key, value));

                }

        }

        /**

         * A?ade un elemento dibujable a la lista

         * @param element

         */

        public void addDrawableElement(DrawableElement element) {

                if (drawableElements.contains(element))

                        return;

                element.setCanvas(this);

                element.firstActions();

                drawableElements.add(element);

        }

        /**

         * Reemplaza un elemento dibujable si encuentra uno de su mismo tipo

         * @param element

         */

        public void replaceDrawableElement(DrawableElement element) {

                for (int i = 0; i < drawableElements.size(); i++) {

                        if (element.getClass().isAssignableFrom(drawableElements.get(i).getClass())) {

                                drawableElements.set(i, element);

                                element.setCanvas(this);

                                break;

                        }

                }

        }

        /**

         * Obtiene todos los elementos dibujable que sean una instancia de c1

         * @param c1

         * @return ArrayList de DrawableElements

         */

        public ArrayList getDrawableElements(Class c1) {

                ArrayList elements = new ArrayList();

                for (int i = 0; i < drawableElements.size(); i++) {

                        if (c1.isInstance(drawableElements.get(i)))

                                elements.add(drawableElements.get(i));

                }

                return elements;

        }

        /**

         * Reemplaza un elemento dibujable si encuentra uno del tipo especificado en el 

         * parametro c1

         * @param element

         * @param c1

         */

        public void replaceDrawableElement(DrawableElement element, Class cl) {

                for (int i = 0; i < drawableElements.size(); i++) {

                        if (cl.isInstance(drawableElements.get(i))) {

                                drawableElements.set(i, element);

                                element.setCanvas(this);

                                break;

                        }

                }

        }

        /**

         * Elimina un elemento dibujable

         * @param Class clase del elemento a eliminar

         */

        public void removeDrawableElement(Class cl) {

                for (int i = 0; i < drawableElements.size(); i++)

                        if (cl.isInstance(drawableElements.get(i)))

                                drawableElements.remove(i);

        }

        /**

         * Asigna una lista de elementos dibujables

         * @return

         */

        public void setDrawableElements(ArrayList list) {

                drawableElements.clear();

                for (int i = 0; i < list.size(); i++)

                        if (list.get(i) instanceof DrawableElement)

                                drawableElements.add(list.get(i));

                repaint();

        }

        /**

         * Inicializa el fondo y dibuja el gr?fico sobre el canvas.

         */

        public void paint(Graphics g) {

                if (g == null) return;

                g.setColor(backgroundColor);

                g.fillRect(0, 0, getWidth(), getHeight());

                for (int i = 0; i < drawableElements.size(); i++) 

                        ((DrawableElement)drawableElements.get(i)).draw(g);

        }

        /**

         * Ejecuta las acciones antes del primer dibujado de todos

         * los elementos dibujables

         */

        public void execFirstDrawActions() {

                for (int i = 0; i < drawableElements.size(); i++) 

                        ((DrawableElement)drawableElements.get(i)).firstDrawActions();

        }

        /**

         * Obtiene la posici?n m?nima en X del canvas donde comenzar a dibujar

         * @return

         */

        public int getCanvasMinX() {

                return borderX1;

        }

        /**

         * Obtiene la posici?n m?nima en Y del canvas donde comenzar a dibujar

         * @return

         */

        public int getCanvasMinY() {

                return borderY1;

        }

        /**

         * Obtiene la posici?n m?xima en X del canvas donde terminar el dibujado

         * @return

         */

        public int getCanvasMaxX() {

                return getWidth() - borderX2;

        }

        /**

         * Obtiene la posici?n m?xima en Y del canvas donde terminar el dibujado

         * @return

         */

        public int getCanvasMaxY() {

                return getHeight() - borderY2;

        }

        /**

         * Obtiene el ancho del canvas sumando a partir de getCanvasX donde termina el ?rea de dibujo

         * @return

         */

        public int getCanvasWidth() {

                return getWidth() - (borderX1 + borderX2);

        }

        /**

         * Obtiene el alto del canvas sumando a partir de getCanvasY donde termina el ?rea de dibujo

         * @return

         */

        public int getCanvasHeight() {

                return getHeight() - (borderY1 + borderY2);

        }

        /*

         * (non-Javadoc)

         * @see java.awt.event.MouseListener#mousePressed(java.awt.event.MouseEvent)

         */

        public void mousePressed(MouseEvent e) {

                for (int i = drawableElements.size() - 1; i >= 0 ; i--)

                        if (!((DrawableElement) drawableElements.get(i)).mousePressed(e))

                                return;

        }

        /*

         * (non-Javadoc)

         * @see java.awt.event.MouseListener#mouseReleased(java.awt.event.MouseEvent)

         */

        public void mouseReleased(MouseEvent e) {

                for (int i = drawableElements.size() - 1; i >= 0 ; i--)

                        if (!((DrawableElement) drawableElements.get(i)).mouseReleased(e))

                                return;

                this.mouseMoved(e);

        }

        /*

         * (non-Javadoc)

         * @see java.awt.event.MouseMotionListener#mouseDragged(java.awt.event.MouseEvent)

         */

        public void mouseDragged(MouseEvent e) {

                for (int i = drawableElements.size() - 1; i >= 0 ; i--)

                        if (!((DrawableElement) drawableElements.get(i)).mouseDragged(e))

                                return;

        }

        /*

         * (non-Javadoc)

         * @see java.awt.event.MouseMotionListener#mouseMoved(java.awt.event.MouseEvent)

         */

        public void mouseMoved(MouseEvent e) {

                for (int i = drawableElements.size() - 1; i >= 0 ; i--)

                        if (!((DrawableElement) drawableElements.get(i)).mouseMoved(e))

                                return;

                setCursor(new Cursor(Cursor.DEFAULT_CURSOR));

        }

        /*

         * (non-Javadoc)

         * @see java.awt.event.MouseListener#mouseEntered(java.awt.event.MouseEvent)

         */

        public void mouseEntered(MouseEvent e) {

                hasMouse = true;

                repaint();

                for (int i = drawableElements.size() - 1; i >= 0 ; i--)

                        if (!((DrawableElement) drawableElements.get(i)).mouseEntered(e))

                                return;

        }

        /*

         * (non-Javadoc)

         * @see java.awt.event.MouseListener#mouseExited(java.awt.event.MouseEvent)

         */

        public void mouseExited(MouseEvent e) {

                hasMouse = false;

                repaint();

                for (int i = drawableElements.size() - 1; i >= 0 ; i--)

                        if (!((DrawableElement) drawableElements.get(i)).mouseExited(e))

                                return;

        }

        /**

         * Devuelve si en ese momento el raton esta sobre el canvas

         * @return

         */

        public boolean isMouse() {

                return hasMouse;

        }

        public void mouseClicked(MouseEvent e) {}

}