Swing技术----------组件重定位（完美实现）
来源：互联网 发布：狄威周比利 知乎 编辑：程序博客网 时间：2024/06/01 09:44
import java.awt.Cursor;import java.awt.Point;import java.awt.Rectangle;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import javax.swing.JButton;import javax.swing.JComponent;import javax.swing.JFrame;import javax.swing.JList;import javax.swing.JPanel;import javax.swing.JTable;import javax.swing.JTree;class DnDAdapter extends MouseAdapter{ //每个组件的信息，在进入组件时获得。 private JComponent jcom; private Point jcomOriginPoint;//组件在容器内的坐标 private int jcomWidth,jcomHeight; //与定位、缩放相关信息 private int a=10;//鼠标检测边沿大小 private Point pointMoved;//移动时，容器内坐标 private CurType curCuror;// private enum CurType {LeftTop,LeftBottom,RightTop,RightBottom,Top,Bottom,Left,Right,Center} //光标区域判断 private CurType getCurType(MouseEvent e) { Point p=e.getPoint();//getPoint返回组件内的坐标 //左上角 0<x<a,0<y<a if((p.x>=0 && p.x<=a)&&(p.y>=0&&p.y<=a)) return CurType.LeftTop; //右下角 w-a<x<w h-a<y<h else if((p.x>=jcomWidth-a&&p.x<=jcomWidth)&&(p.y>=jcomHeight-a&&p.y<=jcomHeight)) return CurType.RightBottom; //右上角w-a<x<w,0<y<a else if((p.x>=jcomWidth-a&&p.x<=jcomWidth)&&(p.y>=0&&p.y<=a)) return CurType.RightTop; //左下角0<x<a,h-a<y<h else if((p.x>=0&&p.x<=a)&&(p.y>=jcomHeight-a&&p.y<=jcomHeight)) return CurType.LeftBottom; //垂直：w-a<x<w && a<y<h-a 右边 else if( p.x>=jcomWidth-a && p.x<=jcomWidth && p.y>=a && p.y<=jcomHeight-a) return CurType.Right; //垂直：0<x<a,a<y<h-a 左边 else if(p.x>=0 && p.x<=a && p.y>=a && p.y<=jcomHeight-a) return CurType.Left; //水平 a<x<w-a && 0<y<a 上边 else if((p.x>=a&&p.x<=jcomWidth-a) &&p.y>=0&&p.y<=a) return CurType.Top; //水平 a<x<w-a &&h-a<y<h 下边 else if((p.x>=a&&p.x<=jcomWidth-a) &&p.y>=jcomHeight-a&&p.y<=jcomHeight) return CurType.Bottom; //中间 else //jcom.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));//没有这句鼠标会一直保持形状 return CurType.Center; } private void setCurType(MouseEvent e) { switch(getCurType(e)) { case LeftTop: jcom.setCursor(Cursor.getPredefinedCursor(Cursor.NW_RESIZE_CURSOR)); curCuror=CurType.LeftTop; break; case LeftBottom: jcom.setCursor(Cursor.getPredefinedCursor(Cursor.SW_RESIZE_CURSOR)); curCuror=CurType.LeftBottom; break; case RightTop: jcom.setCursor(Cursor.getPredefinedCursor(Cursor.NE_RESIZE_CURSOR)); curCuror=CurType.RightTop; break; case RightBottom: jcom.setCursor(Cursor.getPredefinedCursor(Cursor.SE_RESIZE_CURSOR)); curCuror=CurType.RightBottom; break; case Top: jcom.setCursor(Cursor.getPredefinedCursor(Cursor.N_RESIZE_CURSOR)); curCuror=CurType.Top; break; case Bottom: jcom.setCursor(Cursor.getPredefinedCursor(Cursor.N_RESIZE_CURSOR)); curCuror=CurType.Bottom; break; case Left: jcom.setCursor(Cursor.getPredefinedCursor(Cursor.E_RESIZE_CURSOR)); curCuror=CurType.Left; break; case Right: jcom.setCursor(Cursor.getPredefinedCursor(Cursor.E_RESIZE_CURSOR)); curCuror=CurType.Right; break; default: jcom.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR)); curCuror=CurType.Center; break; } } private void setPosition(MouseEvent e) { Point pointNow=e.getLocationOnScreen(); int incX=pointNow.x-pointMoved.x;//增量是相对于最后一次移动的点。 int incY=pointNow.y-pointMoved.y; /// //System.out.print("PointNow:("+pointNow.x+","+pointNow.y+")\t"); //System.out.println("PointMoved:("+pointMoved.x+","+pointMoved.y+")\t"); Rectangle rect=new Rectangle(); switch(curCuror) { case LeftTop: rect.x=jcomOriginPoint.x+incX; rect.y=jcomOriginPoint.y+incY; rect.width=jcomWidth-incX; rect.height=jcomHeight-incY; break; case LeftBottom: rect.x=jcomOriginPoint.x+incX; rect.y=jcomOriginPoint.y; rect.width=jcomWidth-incX; rect.height=jcomHeight+incY; break; case RightTop: rect.x=jcomOriginPoint.x; rect.y=jcomOriginPoint.y+incY; rect.width=jcomWidth+incX; rect.height=jcomHeight-incY; break; case RightBottom: rect.x=jcomOriginPoint.x; rect.y=jcomOriginPoint.y; rect.width=jcomWidth+incX; rect.height=jcomHeight+incY; break; //////////////////////////////////////////// case Top: rect.x=jcomOriginPoint.x; rect.y=jcomOriginPoint.y+incY; rect.width=jcomWidth; rect.height=jcomHeight-incY; break; case Bottom: rect.x=jcomOriginPoint.x; rect.y=jcomOriginPoint.y; rect.width=jcomWidth; rect.height=jcomHeight+incY; break; case Left: rect.x=jcomOriginPoint.x+incX; rect.y=jcomOriginPoint.y; rect.width=jcomWidth-incX; rect.height=jcomHeight; break; case Right://右缩放 rect.x=jcomOriginPoint.x; rect.y=jcomOriginPoint.y; rect.width=jcomWidth+incX; rect.height=jcom.getHeight(); break; /////////////////////////////////////////////// case Center://移动 rect.x=jcomOriginPoint.x+incX; rect.y=jcomOriginPoint.y+incY; rect.width=jcom.getWidth();//防止出现恢复原大小问题。 rect.height=jcom.getHeight(); break; default: break; } jcom.setBounds(rect); } @Override public void mouseMoved(MouseEvent e) { pointMoved=e.getLocationOnScreen(); jcom=(JComponent)e.getSource();//防止抖动关键在这一点 jcomOriginPoint=jcom.getLocation();//获取组件在父窗口的位置 jcomWidth=jcom.getWidth(); jcomHeight=jcom.getHeight();// System.out.print("Old--------------------");// System.out.print("Position:("+jcomOriginPoint.x+","+jcomOriginPoint.y+")\t");// System.out.println(" Width:"+jcomWidth+" Height:"+jcomHeight); /////////////////////////////////////////// setCurType(e); //super.mouseMoved(e); } public void mouseDragged(MouseEvent e) { //相对于移动最后一点的增量 setPosition(e); super.mouseDragged(e); }}public class App { public static void main(String[] args) { JFrame frm=new JFrame(); JPanel panel=new JPanel(null); frm.setSize(600 , 600); frm.setLocation(100, 100); frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); panel.setSize(600, 600); ///////////////////////////////////////// JButton btn=new JButton("Button"); btn.setSize(100, 100); btn.setLocation(100, 100); DnDAdapter dnd=new DnDAdapter(); btn.addMouseMotionListener(dnd); //btn.addMouseListener(dnd); //btn.removeMouseMotionListener(l); panel.add(btn); frm.add(panel); frm.setVisible(true); }}
