Trascina e ridimensiona JFrame non decorato

Question

Attualmente, sto usando il seguente codice per trascinare e spostare i miei JFrames non registrati.

private void initialiseGUI(Component component){ 
    //<editor-fold defaultstate="collapsed" desc="code"> 
    component.addMouseListener(new MouseAdapter() { 
     public void mousePressed(MouseEvent e) { 
      posX = e.getX(); 
      posY = e.getY(); 
     } 
    }); 

    component.addMouseMotionListener(new MouseAdapter() { 
     public void mouseDragged(MouseEvent evt) { 
      //sets frame position when mouse dragged    
      Rectangle rectangle = getBounds(); 
      getGUI().setBounds(evt.getXOnScreen() - posX, evt.getYOnScreen() - posY, rectangle.width, rectangle.height); 
     } 
    }); 
    //</editor-fold> 
} 

Cosa devo scrivere in modo che l'utente possa ridimensionarla come una finestra decorata, trascinando il lato?

Answer 1

È possibile controllare la classe ComponentResizer di Rob Camick. Abbastanza semplice e diretto da usare.

Proprio un'istanza ComponentResizer e registrare il telaio con qualcosa di simile:

JFrame frame = new JFrame(); 
ComponentResizer cr = new ComponentResizer(); 
cr.registerComponent(frame); 
cr.setSnapSize(new Dimension(10, 10)); 
cr.setMaximumSize(new Dimension(...)); 
cr.setMinimumSize(new Dimension(...)); 

Ecco un esempio utilizzando la classe

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import javax.swing.border.LineBorder; 

public class UndecoratedExample { 

    private JFrame frame = new JFrame(); 

    class MainPanel extends JPanel { 

     public MainPanel() { 
      setBackground(Color.gray); 
     } 

     @Override 
     public Dimension getPreferredSize() { 
      return new Dimension(400, 400); 
     } 
    } 

    class BorderPanel extends JPanel { 

     private JLabel label; 
     int pX, pY; 

     public BorderPanel() { 
      label = new JLabel(" X "); 
      label.setOpaque(true); 
      label.setBackground(Color.RED); 
      label.setForeground(Color.WHITE); 

      setBackground(Color.black); 
      setLayout(new FlowLayout(FlowLayout.RIGHT)); 

      add(label); 

      label.addMouseListener(new MouseAdapter() { 
       public void mouseReleased(MouseEvent e) { 
        System.exit(0); 
       } 
      }); 
      addMouseListener(new MouseAdapter() { 
       public void mousePressed(MouseEvent me) { 
        // Get x,y and store them 
        pX = me.getX(); 
        pY = me.getY(); 

       } 

       public void mouseDragged(MouseEvent me) { 

        frame.setLocation(frame.getLocation().x + me.getX() - pX, 
          frame.getLocation().y + me.getY() - pY); 
       } 
      }); 

      addMouseMotionListener(new MouseMotionAdapter() { 
       public void mouseDragged(MouseEvent me) { 

        frame.setLocation(frame.getLocation().x + me.getX() - pX, 
          frame.getLocation().y + me.getY() - pY); 
       } 
      }); 
     } 
    } 

    class OutsidePanel extends JPanel { 

     public OutsidePanel() { 
      setLayout(new BorderLayout()); 
      add(new MainPanel(), BorderLayout.CENTER); 
      add(new BorderPanel(), BorderLayout.PAGE_START); 
      setBorder(new LineBorder(Color.BLACK, 5)); 
     } 
    } 

    private void createAnsShowGui() { 
     ComponentResizer cr = new ComponentResizer(); 
     cr.setMinimumSize(new Dimension(300, 300)); 
     cr.setMaximumSize(new Dimension(800, 600)); 
     cr.registerComponent(frame); 
     cr.setSnapSize(new Dimension(10, 10)); 
     frame.setUndecorated(true); 
     frame.add(new OutsidePanel()); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.pack(); 
     frame.setLocationRelativeTo(null); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 
      public void run() { 
       new UndecoratedExample().createAnsShowGui(); 
      } 
     }); 
    } 
} 

Answer 2

Recentemente ho costruito il mio prototipo di questo . Forse lo troverai utile.

Utilizza 2 componenti diversi uno sull'altro. A differenza di Rob Camick's ComponentResizer su cui questo è ispirato, gli ascoltatori del mouse impostati sui componenti in JFrame saranno funzionali. Non otterrai JFrame per catturare tutti gli eventi del mouse, rendendo inutile collegare gli ascoltatori ai componenti in JFrame. Cattura gli eventi del mouse solo quando e dove deve essere visualizzata una freccia a due punte.

La chiave è questo metodo nel componente superiore:

@Override 
public boolean contains(int x, int y) { 
    return x < insets.left || y < insets.top 
      || getHeight() - y < insets.bottom 
      || getWidth() - x < insets.right; 
} 

Ecco il codice:

import java.awt.Component; 
import java.awt.Point; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseMotionListener; 

public class BackgroundComponentDragger implements MouseMotionListener { 

    private Component controlledComponent; 

    /* 
    * Point where cursor was last clicked. 
    */ 
    private Point originPoint; 

    public BackgroundComponentDragger(Component component) { 
     this.controlledComponent = component; 
    } 

    @Override 
    public void mouseDragged(MouseEvent e) { 
     Point currentFramePosition = controlledComponent.getLocation(); 
     Point newFramePosition = new Point(currentFramePosition.x + e.getX() 
       - originPoint.x, currentFramePosition.y + e.getY() - originPoint.y); 
     controlledComponent.setLocation(newFramePosition); 
    } 

    @Override 
    public void mouseMoved(MouseEvent e) { 
     originPoint = e.getPoint(); 
    } 
} 



import java.awt.Component; 
import java.awt.Cursor; 
import java.awt.Dimension; 
import java.awt.Insets; 
import java.awt.Point; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseMotionListener; 
import java.util.HashMap; 
import java.util.Map; 

public class ComponentBorderDragger implements MouseMotionListener { 

    private Component controlledComponent; 

    private byte direction; 
    protected static final byte NORTH = 1; 
    protected static final byte WEST = 2; 
    protected static final byte SOUTH = 4; 
    protected static final byte EAST = 8; 

    private Cursor sourceCursor; 

    private static Map<Byte, Integer> cursors = new HashMap<Byte, Integer>(); 
    { 
     cursors.put((byte) 1, Cursor.N_RESIZE_CURSOR); 
     cursors.put((byte) 2, Cursor.W_RESIZE_CURSOR); 
     cursors.put((byte) 4, Cursor.S_RESIZE_CURSOR); 
     cursors.put((byte) 8, Cursor.E_RESIZE_CURSOR); 
     cursors.put((byte) 3, Cursor.NW_RESIZE_CURSOR); 
     cursors.put((byte) 9, Cursor.NE_RESIZE_CURSOR); 
     cursors.put((byte) 6, Cursor.SW_RESIZE_CURSOR); 
     cursors.put((byte) 12, Cursor.SE_RESIZE_CURSOR); 
    } 

    private Insets dragInsets; 
    private Dimension minSize; 

    private Point basePoint; 

    public ComponentBorderDragger(Component controlledComponent, Insets dragInsets, 
      Dimension minSize) { 
     super(); 
     this.controlledComponent = controlledComponent; 
     this.dragInsets = dragInsets; 
     this.minSize = minSize; 
    } 

    @Override 
    public void mouseDragged(MouseEvent e) { 
     if (direction == 0) { 
      return; 
     } 

     Point newPoint = e.getPoint(); 
     int x, y, width, height, newBasePointX, newBasePointY; 
     x = controlledComponent.getX(); 
     y = controlledComponent.getY(); 
     width = controlledComponent.getWidth(); 
     height = controlledComponent.getHeight(); 
     newBasePointX = newPoint.x; 
     newBasePointY = newPoint.y; 

     if ((direction & EAST) == EAST) { 
      int newWidth; 
      newWidth = Math.max(minSize.width, width + newPoint.x 
        - basePoint.x); 
      width = newWidth; 
     } 
     if ((direction & SOUTH) == SOUTH) { 
      int novoAlto; 
      novoAlto = Math.max(minSize.height, height + newPoint.y 
        - basePoint.y); 
      height = novoAlto; 
     } 
     if ((direction & WEST) == WEST) { 
      int newWidth, newX; 
      newWidth = Math.max(minSize.width, width - newPoint.x 
        + basePoint.x); 
      newX = Math.min(x + width - minSize.width, x + newPoint.x 
        - basePoint.x); 

      // Changing coordenates of new base point to refer to the new component position 
      newBasePointX -= newX - x; 
      x = newX; 
      width = newWidth; 
     } 
     if ((direction & NORTH) == NORTH) { 
      int newHeigth, newY; 
      newHeigth = Math.max(minSize.height, height - newPoint.y 
        + basePoint.y); 
      newY = Math.min(y + height - minSize.height, y + newPoint.y 
        - basePoint.y); 
      // Changing coordenates of new base point to refer to the new component position 
      newBasePointY -= newY - y; 
      y = newY; 
      height = newHeigth; 
     } 
     controlledComponent.setBounds(x, y, width, height); 
     basePoint = new Point(newBasePointX, newBasePointY); 
    } 

    @Override 
    public void mouseMoved(MouseEvent e) { 
     Component originator = e.getComponent(); 
     if (direction == 0) { 
      sourceCursor = originator.getCursor(); 
     } 
     calculateDirection(e.getPoint(), e.getComponent().getSize()); 
     setCursor(e.getComponent()); 
     basePoint = e.getPoint(); 
    } 

    private void setCursor(Component component) { 
     if (direction == 0) { 
      component.setCursor(sourceCursor); 
     } else { 
      int cursorType = cursors.get(direction); 
      Cursor cursor = Cursor.getPredefinedCursor(cursorType); 
      component.setCursor(cursor); 
     } 
    } 

    private void calculateDirection(Point point, Dimension componentSize) { 
     direction = 0; 
     if (point.x < dragInsets.left) { 
      direction |= WEST; 
     } 
     if (point.y < dragInsets.top) { 
      direction |= NORTH; 
     } 
     if (point.x > componentSize.width - dragInsets.right) { 
      direction |= EAST; 
     } 
     if (point.y > componentSize.height - dragInsets.bottom) { 
      direction |= SOUTH; 
     } 
    } 
} 


import java.awt.Insets; 

import javax.swing.JComponent; 

public class FrameComponent extends JComponent { 

    private static final long serialVersionUID = 3383070502274306213L; 

    private Insets insets; 

    @Override 
    public boolean contains(int x, int y) { 
     return x < insets.left || y < insets.top || getHeight() - y < insets.bottom || getWidth() - x < insets.right; 
    } 

    public FrameComponent(Insets insets) { 
     this.insets = insets; 
    } 
} 


import java.awt.Dimension; 
import java.awt.Insets; 
import java.awt.Toolkit; 
import java.awt.event.ComponentAdapter; 
import java.awt.event.ComponentEvent; 

import javax.swing.JFrame; 
import javax.swing.JPanel; 

public class GUI { 

    private JFrame compoundFrame; 
    private JPanel backgroundPanel; 

    Dimension gUISize = new Dimension(400, 400); 

    public GUI() { 
     buildResizeableFrame(); 
    } 

    public void activate() { 
     compoundFrame.setVisible(true); 
    } 

    private void buildResizeableFrame() { 
     compoundFrame = new JFrame(); 
     FrameComponent frame = new FrameComponent(new Insets(5, 5, 5, 5)); 
     backgroundPanel = new JPanel(); 
     compoundFrame.setLayout(null); 
     compoundFrame.add(frame); 
     compoundFrame.add(backgroundPanel); 
     setFrameSizeController(frame, backgroundPanel); 
     setFrameController(frame); 
     setBackgroundPanelController(backgroundPanel); 
     Dimension dimPant = Toolkit.getDefaultToolkit().getScreenSize(); 
     compoundFrame.setBounds(dimPant.width/4, dimPant.height/4, dimPant.width/2, dimPant.height/2); 
     compoundFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     compoundFrame.setUndecorated(true); 
    } 

    private void setFrameSizeController(FrameComponent frame, JPanel panel) { 
     compoundFrame.addComponentListener(new ComponentAdapter() { 
      @Override 
      public void componentResized(ComponentEvent e) { 
       Dimension sizeIn = ((JFrame) e.getComponent()).getContentPane().getSize(); 
       frame.setSize(sizeIn); 
       panel.setSize(sizeIn); 
      } 
     }); 
    } 

    private void setFrameController(FrameComponent frame) { 
     ComponentBorderDragger controller = new ComponentBorderDragger(compoundFrame, 
       new Insets(5, 5, 5, 5), new Dimension(10, 10)); 
     frame.addMouseMotionListener(controller); 
    } 

    private void setBackgroundPanelController(JPanel panel) { 
     panel.addMouseMotionListener(new BackgroundComponentDragger(compoundFrame)); 
    } 

    public static void main(String[] args) { 
     new GUI().activate(); 
    } 
} 

Nota: Questo codice imposta un LayoutManager nullo e un ascoltatore al contenitore per ridimensionare il componente interno quando necessario. Questa pratica è scoraggiata. Questa logica dovrebbe essere spostata su un gestore di layout personalizzato.