softbutton.java

手机电子书阅读软件基本框架

/********************************************************************
 * 
 * 版权说明，此程序仅供学习参考。不能用于商业
 * 
 ********************************************************************/
package org.pook.ui;

import javax.microedition.lcdui.Graphics;

import org.pook.ui.core.Platform;
import org.pook.ui.event.CommandListener;

/**
 * <b>类名：SoftButton.java</b> </br> 编写日期: 2006-9-14 <br/> 程序功能描述�? <br/> Demo:
 * <br/> Bug: <br/>
 * 
 * 程序变更日期 �?<br/> 变更作�?? �?<br/> 变更说明 �?<br/>
 * 
 * @author wuhua </br> <a href="mailto:[e-mail]">[e-mail]</a>
 */
public class SoftButton extends Part {
	/** 软键 * */

	private  CommandListener commandListener;

	private Command left;

	private Command right;

	private Command middle;

	/**
	 * 构�?�固定位置的软键�?
	 * 
	 */
	public SoftButton() {
		super(0, Platform.HEIGHT - 20, Platform.WIDTH, Platform.HEIGHT);
	}

	/**
	 * 添加�?�?
	 * 
	 * @param item
	 */
	public void addCommand(Command cmd) {
		if (cmd.type == Command.LEFT)
			this.left = cmd;
		else if (cmd.type == Command.RIGHT) {
			this.right = cmd;
		} else if (cmd.type == Command.MIDDLE) {
			 
			this.middle = cmd;
		}

	}

	/** 删除相应的Command */
	public void removeCommand(int type) {
		if (type == Command.LEFT)
			left = null;
		else if (type == Command.MIDDLE)
			middle = null;
		else if (type == Command.RIGHT)
			right = null;
	}

	/**
	 * 注册监视�?
	 */
	public void setCommandListener(
		 CommandListener commandListener) {

		this.commandListener = commandListener;

	}

	public void paint(Graphics g) {
		paintCmdsImpl(g);
	}

	/**
	 * 绘制cmds
	 */
	private void paintCmdsImpl(Graphics g) {
		fillCmdsClip(g);
		paintCmdNames(g);
	}

	// 填充cmds区域
	private void fillCmdsClip(Graphics g) {
		
		if (Platform.HEIGHT - 20 > this.view[HEIGHT]) {
			view[Y] = Platform.HEIGHT - 20;
			view[HEIGHT] = Platform.HEIGHT;
		}
		g.setColor(bgColor);
		g.fillRect(view[X], view[Y], view[WIDTH], view[HEIGHT]);
		
		g.setColor(0x000000);
		//画条白线
		g.drawLine(view[X],view[Y],view[WIDTH],view[Y]);
	 
	}

	private void paintCmdNames(Graphics g) {
		g.setFont(this.font);
		g.setColor(fontColor);

		if (left != null) {
			g.drawString(left.name, 2, view[Y] + 2, Graphics.TOP
					| Graphics.LEFT);
		}

		if (middle != null) {

			g.drawString(middle.name, view[WIDTH] / 2, view[Y] + 2,
					Graphics.HCENTER | Graphics.TOP);
		}
		if (right != null) {
			g.drawString(right.name, view[WIDTH] - 2, view[Y] + 2, Graphics.TOP
					| Graphics.RIGHT);
		}
	}

	/**
	 * 按钮的动�?
	 */
	public void onClick(int keyCode) {
		if (this.commandListener == null)
			return;
		if (keyCode == Platform.KEY_SOFT_LEFT && cmdIsExist(left)) {
			commandListener.commandAction(left);
		} else if (keyCode == Platform.KEY_SOFT_RIGHT && cmdIsExist(right)) {
			commandListener.commandAction(right);
		} else if (keyCode == Platform.KEY_ENTER) {
			if (cmdIsExist(left) && left.priority == Command.FIRST_PRIORITY) {
				commandListener.commandAction(left);
				return;
			}

			if (cmdIsExist(right) && right.priority == Command.FIRST_PRIORITY) {
				commandListener.commandAction(right);
			}

		}

	}

	// 判断是否存在这个命令,如果为空,或�?�标题为""则表示不存在
	private boolean cmdIsExist(Command cmd) {
		if (cmd == null || cmd.equals(""))
			return false;
		else
			return true;

	}

}