装飾されていないJFrameをドラッグしてサイズを変更する

Question

現在、次のコードを使用して、コード化されていないJFrameをドラッグアンド移動しています。

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>
}

ユーザーが側面をドラッグして装飾されたウィンドウのようにサイズを変更できるようにするには、何を書く必要がありますか？

Answer 1

Mr Rob Camickの ComponentResizer クラスをチェックできます。非常にシンプルで簡単に使用できます。

ComponentResizerをインスタンス化し、次のようなフレームを登録するだけです。

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(...));

クラスの使用例を次に示します。

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

私は最近、このための独自のプロトタイプを作成しました。多分あなたはこれが役に立つと思うでしょう。

2つの異なるコンポーネントを重ねて使用します。これが触発された Rob CamickのComponentResizer とは異なり、JFrameのコンポーネントに設定されたマウスリスナーは機能します。 JFrameですべてのマウスイベントをキャプチャすることはできないため、リスナーをJFrameのコンポーネントにアタッチすることは無意味です。両方向矢印を表示する必要がある場合と場所でのみ、マウスイベントをキャプチャします。

重要なのは、トップコンポーネントのこのメソッドです。

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

コードは次のとおりです。

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();
    }
}

注：このコードは、nullのLayoutManagerとリスナーをコンテナーに設定して、必要に応じて内部コンポーネントのサイズを変更します。この方法はお勧めしません。このロジックは、カスタムレイアウトマネージャーに移動する必要があります。