本文為大家分享了swing實現窗體拖拽和拉伸的具體代碼，供大家參考，具體內容如下
當用setundecorated(true) 后 jframe去掉標題欄后就得自己寫拖拽和拉伸功能了。
下面是效果圖，我的截圖軟件不能夠截取除系統默認光標外的光標，所以各個方向光標變化在圖中沒有體現
代碼如下：
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import javax.swing.*; import java.awt.*; /** * 窗體拖拽和拉伸 */public class winresizedemo { private jframe jf; public winresizedemo(){ jf=new jframe(); jf.setundecorated(true);//去標邊界和標題欄 jf.setlocationrelativeto(null);//窗口置中 jf.setsize(400,400); jf.setdefaultcloseoperation(jframe.exit_on_close); resizeevent dg = new resizeevent(jf); /**添加兩個監聽器**/ 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; /** * 實現窗口各個方向拉伸以及拖動。 */public class resizeevent extends mouseadapter{ public jframe jf; private point prepos,curpos,jfpos; private static final double breadth = 15.0;//邊界拉伸范圍 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位置不變，y位置變化，并且height變化 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位置不變，x位置變化，width變化 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位置不變，width變化 jf.setlocation(jfpos.x, jfpos.y); jf.setsize(jf.getwidth()+(curpos.x-prepos.x), jf.getheight()); break; case drag_bottom://x,y位置不變，height變化 jf.setlocation(jfpos.x, jfpos.y); jf.setsize(jf.getwidth(), jf.getheight()+(curpos.y-prepos.y)); break; case drag_upleft://x,y位置均變化，h,w均變化 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位置均不變，h,w變化 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位置不變，y,w,h變化 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不變，xwh變化 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內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：http://blog.csdn.net/a694543965/article/details/78027743
