基於swing實現窗體拖拽和拉伸

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) 後JFrame去掉標題欄後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：

 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(); } }

 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;//邊界拉伸範圍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，並且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武林網。