createtool.java

用java实现的画图程序

package com.sunking.tp.tool;
import java.awt.*;
import java.awt.event.MouseEvent;
import javax.swing.*;
import com.sunking.tp.framework.*;
/**
 *
 * <p>Title: </p>
 * <p>Description: 创建组件工具</p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author <a href="mailto:[e-mail]">SunKing</a>
 * @version 1.0
 */
public class CreateTool extends AbstractTool {
    int index = 3;
    JTPComponent btt;
    JTPComponent source;
    Point lastPoint;
    /**
     *
     * @param desk 所属绘图桌面
     * @param c 被创建组件的原型
     * @param icon 图标
     */
    public CreateTool(Desktop desk,JTPComponent c,Icon icon) {
        super(desk);
        setToolTip("Create");
        setIcon(icon);
        source = c;
    }
    /**
     *启用工具
     */
    public void enabledTool() {
        super.enabledTool();
        desk.setCursor(new Cursor(Cursor.CROSSHAIR_CURSOR));
    }
    public void mousePressed(MouseEvent e) {
        lastPoint = e.getPoint();
        btt = (JTPComponent)(source.clone());//复制一个做为新创建的组件
        btt.setText("["+index+++"]"+source.getText());
        ((Component)btt).setLocation(e.getPoint());
        ((Container)desk).add(((Component)btt), null);
    }
    public void mouseReleased(MouseEvent e) {
		/**
		*长宽为0时表示未创建
		*/
        if(((Component)btt).getWidth() == 0 || ((Component)btt).getHeight() == 0){
            ((Container)desk).remove(((Component)btt));
        }
        lastPoint = null;
        btt = null;
        desk.setTool(null);
    }
	/**
	*拖动组件时改变大小
	*/
    public void mouseDragged(MouseEvent e){
        if(btt!=null&&lastPoint != null){
            int x=e.getX(),y=e.getY(),m=lastPoint.x,n=lastPoint.y;
            int tmp=0;
            if(x<m){tmp=x;x=m;m=tmp;}
            if(y<n){tmp=y;y=n;n=tmp;}
            ((Component)btt).setBounds(m,n,x-m,y-n);
            ((Container)desk).repaint();
        }
    }
}