Implementierung von Fensterzieh- und -vergrößerungsfunktionen basierend auf Swing

This article shares the specific code for implementing window dragging and stretching in Swing for everyone's reference, and the specific content is as follows

After using setUndecorated(true), when the JFrame removes the title bar, you need to write the dragging and stretching function yourself.

Below is the effect diagram, my screenshot software cannot capture cursors other than the system default cursor, so the change of cursors in all directions is not reflected in the figure

The code is as follows:

import javax.swing.*; 
import java.awt.*; 
/** 
 * Window dragging and stretching 
 */ 
public class winReSizeDemo { 
 private JFrame jf; 
 public winReSizeDemo(){ 
  jf=new JFrame(); 
  jf.setUndecorated(true);//Remove the border and title bar 
  jf.setLocationRelativeTo(null);//Center the window 
  jf.setSize(400,400); 
  jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
  reSizeEvent dg = new reSizeEvent(jf); 
  /**Add two listeners**/ 
  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; 
/** 
 * Implement the stretching and dragging of the window in all directions. 
 */ 
public class reSizeEvent extends MouseAdapter{ 
 public JFrame jf; 
 private Point prePos, curPos, jfPos; 
 private static final double BREADTH = 15.0;//Bereich der Dehnung 
 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 Position unverändert, y Position geändert und Höhe geändert 
    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 Position unverändert, x Position geändert, Breite geändert 
    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 Position unverändert, Breite geändert 
    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)); 
  && p.getX() < (jf.getWidth() 
    dragType = DRAG_BOTTOM;-BREADTH) 
    && p.getY() <= BREADTH){ 
   dragType = DRAG_UP; 
   jf.setCursor(new Cursor(Cursor.N_RESIZE_CURSOR)); 
  }-BREADTH) && p.getY() <= BREADTH){ 
   dragType = DRAG_UPRIGHT; 
   jf.setCursor(new Cursor(Cursor.NE_RESIZE_CURSOR)); 
  jf.setCursor(new Cursor(Cursor.SW_RESIZE_CURSOR)); 
    && p.getY() < (jf.getHeight(){-BREADTH) 
    && p.getY() > BREADTH){ 
   dragType = DRAG_LEFT; 
   jf.setCursor(new Cursor(Cursor.W_RESIZE_CURSOR)); 
  }-BREADTH) 
    && p.getY() < (jf.getHeight(){-BREADTH) 
    && p.getY() > BREADTH){ 
   dragType = DRAG_RIGHT; 
   jf.setCursor(new Cursor(Cursor.E_RESIZE_CURSOR)); 
  jf.setCursor(new Cursor(Cursor.SW_RESIZE_CURSOR)); 
    && p.getY() >= (jf.getHeight()-BREADTH) 
   else if (p.getX() > BREADTH 
   } 
  && p.getX() < (jf.getWidth() 
    dragType = DRAG_BOTTOM;-BREADTH) 
    && p.getY() >= (jf.getHeight()-BREADTH) 
   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呐喊教程。

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