java - 境界長方形を描画して、記録する領域を選択します

Question

画面に半透明の長方形を描くにはどうすればよいですか? JFrameJFrames には通常のクローズ、最小化、最大化のオプションが右上にあるため、これは不可能です。
もし本当にスイングが上手いのなら、どうやって空中に引き寄せられるのだろうか？それをまったく挿入せずにJFrame？それが何であるか、そしてそれを実装する方法を教えてください...

Answer 1

頭に浮かぶ当面のアイデアはjava.awt.Robot、スクリーンショットをキャプチャし、それをフレームのないウィンドウにペイントするために使用することです。そこから、長方形を描くだけです。

例で更新

...しばらく時間がかかりました...

public class SelectionRectangle {

    public static void main(String[] args) {
        new SelectionRectangle();
    }

    public SelectionRectangle() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Test");
                frame.setUndecorated(true);
                frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new BackgroundPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }

        });
    }

    public class BackgroundPane extends JPanel {

        private BufferedImage background;
        private Point mouseAnchor;
        private Point dragPoint;

        private SelectionPane selectionPane;

        public BackgroundPane() {
            selectionPane = new SelectionPane();
            try {
                Robot bot = new Robot();
                background = bot.createScreenCapture(getScreenViewableBounds());
            } catch (AWTException ex) {
                Logger.getLogger(SelectionRectangle.class.getName()).log(Level.SEVERE, null, ex);
            }

            selectionPane = new SelectionPane();
            setLayout(null);
            add(selectionPane);

            MouseAdapter adapter = new MouseAdapter() {
                @Override
                public void mousePressed(MouseEvent e) {
                    mouseAnchor = e.getPoint();
                    dragPoint = null;
                    selectionPane.setLocation(mouseAnchor);
                    selectionPane.setSize(0, 0);
                }

                @Override
                public void mouseDragged(MouseEvent e) {
                    dragPoint = e.getPoint();
                    int width = dragPoint.x - mouseAnchor.x;
                    int height = dragPoint.y - mouseAnchor.y;

                    int x = mouseAnchor.x;
                    int y = mouseAnchor.y;

                    if (width < 0) {
                        x = dragPoint.x;
                        width *= -1;
                    }
                    if (height < 0) {
                        y = dragPoint.y;
                        height *= -1;
                    }
                    selectionPane.setBounds(x, y, width, height);
                    selectionPane.revalidate();
                    repaint();
                }

            };
            addMouseListener(adapter);
            addMouseMotionListener(adapter);

        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g.create();
            g2d.drawImage(background, 0, 0, this);
            g2d.dispose();
        }

    }

    public class SelectionPane extends JPanel {

        private JButton button;
        private JLabel label;

        public SelectionPane() {
            button = new JButton("Close");
            setOpaque(false);

            label = new JLabel("Rectangle");
            label.setOpaque(true);
            label.setBorder(new EmptyBorder(4, 4, 4, 4));
            label.setBackground(Color.GRAY);
            label.setForeground(Color.WHITE);
            setLayout(new GridBagLayout());

            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            add(label, gbc);

            gbc.gridy++;
            add(button, gbc);

            button.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    SwingUtilities.getWindowAncestor(SelectionPane.this).dispose();
                }
            });

            addComponentListener(new ComponentAdapter() {
                @Override
                public void componentResized(ComponentEvent e) {
                    label.setText("Rectangle " + getX() + "x" + getY() + "x" + getWidth() + "x" + getHeight());
                }
            });

        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g.create();
            g2d.setColor(new Color(128, 128, 128, 64));
            g2d.fillRect(0, 0, getWidth(), getHeight());

            float dash1[] = {10.0f};
            BasicStroke dashed =
                            new BasicStroke(3.0f,
                            BasicStroke.CAP_BUTT,
                            BasicStroke.JOIN_MITER,
                            10.0f, dash1, 0.0f);
            g2d.setColor(Color.BLACK);
            g2d.setStroke(dashed);
            g2d.drawRect(0, 0, getWidth() - 3, getHeight() - 3);
            g2d.dispose();
        }

    }

    public static Rectangle getScreenViewableBounds() {
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice gd = ge.getDefaultScreenDevice();

        return getScreenViewableBounds(gd);
    }

    public static Rectangle getScreenViewableBounds(GraphicsDevice gd) {
        Rectangle bounds = new Rectangle(0, 0, 0, 0);
        if (gd != null) {
            GraphicsConfiguration gc = gd.getDefaultConfiguration();
            bounds = gc.getBounds();

            Insets insets = Toolkit.getDefaultToolkit().getScreenInsets(gc);

            bounds.x += insets.left;
            bounds.y += insets.top;
            bounds.width -= (insets.left + insets.right);
            bounds.height -= (insets.top + insets.bottom);
        }
        return bounds;
    }
}

SnipItの例で更新

一部の人々は、画面の上部に配置された透明なウィンドウを使用することを提案しましたが、これは実際には機能しません。透明なウィンドウは、マウスイベントを可能にする何かがペイントされていない限り、実際にはマウスのクリックに応答しないためです。閉じ込められる。

選択メカニズムとしてウィンドウを使用することも提案されていますが、これは有効な答えですが、ユーザーが選択長方形をクリックしてドラッグするだけでよいため、（個人的には）不適切な解決策であることがわかります（IMHO ）。

別のアプローチは、SnipItのようなものを使用することです。

public class SnipIt {

    public static void main(String[] args) {
        new SnipIt();
    }

    public SnipIt() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame();
                frame.setUndecorated(true);
                // This works differently under Java 6
                frame.setBackground(new Color(0, 0, 0, 0));
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new SnipItPane());
                frame.setBounds(getVirtualBounds());
                frame.setVisible(true);
            }
        });
    }

    public class SnipItPane extends JPanel {

        private Point mouseAnchor;
        private Point dragPoint;

        private SelectionPane selectionPane;

        public SnipItPane() {
            setOpaque(false);
            setLayout(null);
            selectionPane = new SelectionPane();
            add(selectionPane);
            MouseAdapter adapter = new MouseAdapter() {
                @Override
                public void mousePressed(MouseEvent e) {
                    mouseAnchor = e.getPoint();
                    dragPoint = null;
                    selectionPane.setLocation(mouseAnchor);
                    selectionPane.setSize(0, 0);
                }

                @Override
                public void mouseDragged(MouseEvent e) {
                    dragPoint = e.getPoint();
                    int width = dragPoint.x - mouseAnchor.x;
                    int height = dragPoint.y - mouseAnchor.y;

                    int x = mouseAnchor.x;
                    int y = mouseAnchor.y;

                    if (width < 0) {
                        x = dragPoint.x;
                        width *= -1;
                    }
                    if (height < 0) {
                        y = dragPoint.y;
                        height *= -1;
                    }
                    selectionPane.setBounds(x, y, width, height);
                    selectionPane.revalidate();
                    repaint();
                }
            };
            addMouseListener(adapter);
            addMouseMotionListener(adapter);
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);

            Graphics2D g2d = (Graphics2D) g.create();

            Rectangle bounds = new Rectangle(0, 0, getWidth(), getHeight());
            Area area = new Area(bounds);
            area.subtract(new Area(selectionPane.getBounds()));

            g2d.setColor(new Color(192, 192, 192, 64));
            g2d.fill(area);

        }
    }

    public class SelectionPane extends JPanel {

        private JButton button;
        private JLabel label;

        public SelectionPane() {
            button = new JButton("Close");
            setOpaque(false);

            label = new JLabel("Rectangle");
            label.setOpaque(true);
            label.setBorder(new EmptyBorder(4, 4, 4, 4));
            label.setBackground(Color.GRAY);
            label.setForeground(Color.WHITE);
            setLayout(new GridBagLayout());

            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            add(label, gbc);

            gbc.gridy++;
            add(button, gbc);

            button.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    SwingUtilities.getWindowAncestor(SelectionPane.this).dispose();
                }
            });

            addComponentListener(new ComponentAdapter() {
                @Override
                public void componentResized(ComponentEvent e) {
                    label.setText("Rectangle " + getX() + "x" + getY() + "x" + getWidth() + "x" + getHeight());
                }
            });

        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g.create();
            // I've chosen NOT to fill this selection rectangle, so that
            // it now appears as if you're "cutting" away the selection
//            g2d.setColor(new Color(128, 128, 128, 64));
//            g2d.fillRect(0, 0, getWidth(), getHeight());

            float dash1[] = {10.0f};
            BasicStroke dashed =
                    new BasicStroke(3.0f,
                    BasicStroke.CAP_BUTT,
                    BasicStroke.JOIN_MITER,
                    10.0f, dash1, 0.0f);
            g2d.setColor(Color.BLACK);
            g2d.setStroke(dashed);
            g2d.drawRect(0, 0, getWidth() - 3, getHeight() - 3);
            g2d.dispose();
        }
    }

    public static Rectangle getVirtualBounds() {

        Rectangle bounds = new Rectangle(0, 0, 0, 0);

        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice lstGDs[] = ge.getScreenDevices();
        for (GraphicsDevice gd : lstGDs) {

            bounds.add(gd.getDefaultConfiguration().getBounds());

        }

        return bounds;

    }
}

Answer 2

マルチ モニター サポートを @MadProgrammer からの回答例に更新します。

なしExtendedState(JFrame.MAXIMIZED_BOTH)とpack()

public SelectionRectangle() {
    EventQueue.invokeLater(new Runnable() {
        @Override
        public void run() {
            try {
                UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
            } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
            }

            JFrame frame = new JFrame("Test");
            frame.setUndecorated(true);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setLayout(new BorderLayout());
            frame.add(new BackgroundPane());

            frame.setResizable( false );
            frame.setBounds( getScreenViewableBounds() );

            frame.setVisible(true);
        }

    });
}

---

public static Rectangle getScreenViewableBounds() {
    GraphicsDevice[] devices = GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices();
    int minx = Integer.MAX_VALUE;
    int miny = Integer.MAX_VALUE;
    int maxx = Integer.MIN_VALUE;
    int maxy = Integer.MIN_VALUE;
    for( GraphicsDevice device : devices ) {
        for( GraphicsConfiguration config : device.getConfigurations() ) {
            Rectangle bounds = config.getBounds();
            minx = Math.min( minx, bounds.x );
            miny = Math.min( miny, bounds.y );
            maxx = Math.max( maxx, bounds.x + bounds.width );
            maxy = Math.max( maxy, bounds.y + bounds.height );
        }
    }
    return new Rectangle( new Point(minx, miny), new Dimension(maxx - minx, maxy - miny) );
}

Answer 3

基本的な境界線を作成するために、装飾されていない透明なフレームを使用できます。

public class ScreenRectangle extends JFrame {

    public ScreenRectangle() {
        this.setUndecorated(true);
        this.setBackground(new Color(0, 0, 0, 0.25F));
        // opacity ranges 0.0-1.0 and is the fourth paramater
        this.add(new DrawPanel());
    }

    private class DrawPanel extends JPanel {

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.drawRect(0, 0, this.getWidth(), this.getHeight());
            // any other drawing
        } 
    }
}

フレームも必要かもしれませんsetOpaqueし、パネルサイズを扱う必要があるかもしれませんが、これが一般的な考え方です。