本文为大家分享了swing实现窗体拖拽和拉伸的具体代码，供大家参考，具体内容如下
当用setundecorated(true) 后 jframe去掉标题栏后就得自己写拖拽和拉伸功能了。
下面是效果图，我的截图软件不能够截取除系统默认光标外的光标，所以各个方向光标变化在图中没有体现
代码如下：
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import javax.swing.*;
import java.awt.*;
/**
* 窗体拖拽和拉伸
*/
public class winresizedemo {
private jframe jf;
public winresizedemo(){
jf=new jframe();
jf.setundecorated(true);//去标边界和标题栏
jf.setlocationrelativeto(null);//窗口置中
jf.setsize(400,400);
jf.setdefaultcloseoperation(jframe.exit_on_close);
resizeevent dg = new resizeevent(jf);
/**添加两个监听器**/
jf.addmouselistener(dg);
jf.addmousemotionlistener(dg);
jf.setvisible(true);
}
public static void main(string [] args){
new winresizedemo();
}
}
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import javax.swing.*;
import java.awt.*;
import java.awt.event.mouseadapter;
import java.awt.event.mouseevent;
/**
* 实现窗口各个方向拉伸以及拖动。
*/
public class resizeevent extends mouseadapter{
public jframe jf;
private point prepos,curpos,jfpos;
private static final double breadth = 15.0;//边界拉伸范围
private int dragtype;
private static final int drag_move = 1;
private static final int drag_up = 2;
private static final int drag_upleft = 3;
private static final int drag_upright = 4;
private static final int drag_left = 5;
private static final int drag_right = 6;
private static final int drag_bottom = 7;
private static final int drag_bottomleft = 8;
private static final int drag_bottomright = 9;
public resizeevent(jframe jf){
this.jf = jf;
}
@override
public void mousepressed(mouseevent e){
prepos = e.getlocationonscreen();
}
@override
public void mousemoved(mouseevent e){
areacheck(e.getpoint());
}
@override
public void mousedragged(mouseevent e){
curpos = e.getlocationonscreen();
jfpos = jf.getlocation();
dragaction();
prepos = curpos;
}
private void dragaction(){
switch(dragtype){
case drag_move:
jf.setlocation(jfpos.x+curpos.x-prepos.x,
jfpos.y+curpos.y-prepos.y);
break;
case drag_up://x位置不变，y位置变化，并且height变化
jf.setlocation(jfpos.x,
jfpos.y+curpos.y-prepos.y);
jf.setsize(jf.getwidth(), jf.getheight()-(curpos.y-prepos.y));
break;
case drag_left://y位置不变，x位置变化，width变化
jf.setlocation(jfpos.x+curpos.x-prepos.x,
jfpos.y);
jf.setsize(jf.getwidth()-(curpos.x-prepos.x), jf.getheight());
break;
case drag_right://x,y位置不变，width变化
jf.setlocation(jfpos.x,
jfpos.y);
jf.setsize(jf.getwidth()+(curpos.x-prepos.x), jf.getheight());
break;
case drag_bottom://x,y位置不变，height变化
jf.setlocation(jfpos.x,
jfpos.y);
jf.setsize(jf.getwidth(), jf.getheight()+(curpos.y-prepos.y));
break;
case drag_upleft://x,y位置均变化，h,w均变化
jf.setlocation(jfpos.x+curpos.x-prepos.x,
jfpos.y+curpos.y-prepos.y);
jf.setsize(jf.getwidth()-(curpos.x-prepos.x), jf.getheight()-(curpos.y-prepos.y));
break;
case drag_bottomright://x,y位置均不变，h,w变化
jf.setlocation(jfpos.x,
jfpos.y);
jf.setsize(jf.getwidth()+(curpos.x-prepos.x), jf.getheight()+(curpos.y-prepos.y));
break;
case drag_upright://x位置不变，y,w,h变化
jf.setlocation(jfpos.x,
jfpos.y+curpos.y-prepos.y);
jf.setsize(jf.getwidth()+(curpos.x-prepos.x), jf.getheight()-(curpos.y-prepos.y));
break;
case drag_bottomleft://y不变，xwh变化
jf.setlocation(jfpos.x+curpos.x-prepos.x,
jfpos.y);
jf.setsize(jf.getwidth()-(curpos.x-prepos.x), jf.getheight()+(curpos.y-prepos.y));
break;
default:
break;
}
}
private boolean areacheck(point p){
if(p.getx()<=breadth && p.gety()<=breadth){
dragtype = drag_upleft;
jf.setcursor(new cursor(cursor.nw_resize_cursor));
}else if(p.getx()>breadth
&& p.getx()<(jf.getwidth()-breadth)
&& p.gety()<=breadth){
dragtype = drag_up;
jf.setcursor(new cursor(cursor.n_resize_cursor));
}else if(p.getx()>=(jf.getwidth()-breadth) && p.gety()<=breadth){
dragtype = drag_upright;
jf.setcursor(new cursor(cursor.ne_resize_cursor));
}else if(p.getx()<=breadth
&& p.gety()<(jf.getheight()-breadth)
&& p.gety()>breadth){
dragtype = drag_left;
jf.setcursor(new cursor(cursor.w_resize_cursor));
}else if(p.getx()>=(jf.getwidth()-breadth)
&& p.gety()<(jf.getheight()-breadth)
&& p.gety()>breadth){
dragtype = drag_right;
jf.setcursor(new cursor(cursor.e_resize_cursor));
}else if(p.getx()<=breadth
&& p.gety()>=(jf.getheight()-breadth)){
dragtype = drag_bottomleft;
jf.setcursor(new cursor(cursor.sw_resize_cursor));
}else if(p.getx()>breadth
&& p.getx()<(jf.getwidth()-breadth)
&& p.gety()>=(jf.getheight()-breadth)){
dragtype = drag_bottom;
jf.setcursor(new cursor(cursor.s_resize_cursor));
}else if(p.getx()>=(jf.getwidth()-breadth)
&& p.gety()>=(jf.getheight()-breadth)){
dragtype = drag_bottomright;
jf.setcursor(new cursor(cursor.se_resize_cursor));
}else{
dragtype = drag_move;
jf.setcursor(new cursor(cursor.move_cursor));
return false;
}
return true;
}
}
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持快网idc。
原文链接：http://blog.csdn.net/a694543965/article/details/78027743
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