ColorPicker.java

/**
* Copyright (c) 2012-2013 Nokia Corporation. All rights reserved.
* Nokia and Nokia Connecting People are registered trademarks of Nokia Corporation. 
* Oracle and Java are trademarks or registered trademarks of Oracle and/or its
* affiliates. Other product and company names mentioned herein may be trademarks
* or trade names of their respective owners. 
* See LICENSE.TXT for license information.
*/

package com.nokia.example.paint.views.components;

import com.nokia.example.paint.Main;
import com.nokia.example.paint.helpers.ImageLoader;
import com.nokia.example.paint.helpers.Rectangle;
import java.util.Vector;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;

/*
 * Color picker dialog.
 */
public class ColorPicker {

    private Image palette;
    private int x = 4;
    private int y = 27;
    private Rectangle area;
    private Vector listeners;
    private boolean isShown = false;

    public ColorPicker(int screenWidth) {
        listeners = new Vector();
        palette = ImageLoader.getInstance().loadImage("/color_panel.png");
        if (screenWidth > 240) {
            x = (screenWidth - palette.getWidth()) / 2;
        }
        area = new Rectangle(x + 14, y + 17, 200, 233);

    }

    public void render(Graphics g) {
        if (isShown) {
            g.drawImage(palette, x, y, Graphics.TOP | Graphics.LEFT);
        }
    }

    public void dragged(int x, int y) {
        selectColor(x, y);
    }

    public void pressed(int x, int y) {
        selectColor(x, y);
        // hide me
        Main.getInstance().getDrawArea().hideColorPicker();
    }

    public void addListener(ColorChangeListener listener) {
        listeners.addElement(listener);
    }

    public void show() {
        isShown = true;
    }

    public void hide() {
        isShown = false;
    }

    public boolean isVisible() {
        return isShown;
    }

    private void selectColor(int x, int y) {
        if (area.isPointInside(x, y)) {
            int[] argb = new int[1];
            palette.getRGB(argb, 0, 1, x - this.x, y - this.y, 1, 1);
            int rgb = argb[0] & 0x00FFFFFF;
            int l = listeners.size();
            for (int i = 0; i < l; i++) {
                ColorChangeListener listener = (ColorChangeListener) listeners.elementAt(i);
                listener.colorChanged(rgb);
            }
        }

    }
}