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; } } |
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服务器之家。
原文链接：http://blog.csdn.net/a694543965/article/details/78027743
