java - 使用每像素透明度时 JScrollPane 中的滚动速度非常慢

Question

我正在使用 AWTUtilities.setWindowOpaque() 使用每像素透明度在 JFrame , 包含 JScrollPane .当透明度打开时，该 Pane 中的滚动非常缓慢且滞后，否则不会。在 Windows 7 和 JDK 6 上尝试这个。

public class MainFrame extends JFrame {
    super();

    setUndecorated(true);
    AWTUtilities.setWindowOpaque(this, false); //this turns JScrollPane inside of this JFrame slow and laggy
}

有人发过这个吗？谢谢!

Answer 1

我看不到任何滚动问题，也没有为基于良好 Swing 规则的代码创建测试场景，此代码对于处理器和 GPU、Java6、Win7 64b 来说太难了



从代码

import com.sun.awt.AWTUtilities;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.table.TableModel;

public class ViewPortFlickeringOriginal {

    private JFrame frame = new JFrame("Table");
    private JViewport viewport = new JViewport();
    private Rectangle RECT = new Rectangle();
    private Rectangle RECT1 = new Rectangle();
    private JTable table = new JTable(50, 3);
    private javax.swing.Timer timer;
    private int count = 0;
    private GradientViewPortOriginal tableViewPort;
    private static boolean loggerOpacity;
    private JPanel panel = new JPanel();
    private static JButton button;

    public ViewPortFlickeringOriginal() {
        tableViewPort = new GradientViewPortOriginal(table);
        viewport = tableViewPort.getViewport();
        viewport.addChangeListener(new ChangeListener() {

            @Override
            public void stateChanged(ChangeEvent e) {
                if (tableViewPort.bolStart) {
                    RECT = table.getCellRect(0, 0, true);
                    RECT1 = table.getCellRect(table.getRowCount() - 1, 0, true);
                    Rectangle viewRect = viewport.getViewRect();
                    if (viewRect.intersects(RECT)) {
                        System.out.println("Visible RECT -> " + RECT);
                        tableViewPort.paintBackGround(new Color(250, 150, 150));
                    } else if (viewRect.intersects(RECT1)) {
                        System.out.println("Visible RECT1 -> " + RECT1);
                        tableViewPort.paintBackGround(new Color(150, 250, 150));
                    } else {
                        System.out.println("Visible RECT1 -> ???? ");
                        tableViewPort.paintBackGround(new Color(150, 150, 250));
                    }
                }
            }
        });
        frame.add(tableViewPort);
        button = new JButton("Change Opacity for Java6 / Win7");
        button.setBounds(100, 100, 50, 50);
        button.setVisible(true);
        panel.add(button);
        loggerOpacity = true;
        button.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent evt) {
                Object src = evt.getSource();
                if (src == button && loggerOpacity) {
                    AWTUtilities.setWindowOpacity(frame, 0.80f);
                }
            }
        });
        frame.add(panel, BorderLayout.SOUTH);
        frame.setPreferredSize(new Dimension(600, 300));
        frame.pack();
        frame.setLocation(50, 100);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        RepaintManager.setCurrentManager(new RepaintManager() {

            @Override
            public void addDirtyRegion(JComponent c, int x, int y, int w, int h) {
                Container con = c.getParent();
                while (con instanceof JComponent) {
                    if (!con.isVisible()) {
                        return;
                    }
                    if (con instanceof GradientViewPortOriginal) {
                        c = (JComponent) con;
                        x = 0;
                        y = 0;
                        w = con.getWidth();
                        h = con.getHeight();
                    }
                    con = con.getParent();
                }
                super.addDirtyRegion(c, x, y, w, h);
            }
        });
        frame.setVisible(true);
        start();
    }

    private void start() {
        timer = new javax.swing.Timer(100, updateCol());
        timer.start();
    }

    public Action updateCol() {
        return new AbstractAction("text load action") {

            private static final long serialVersionUID = 1L;

            @Override
            public void actionPerformed(ActionEvent e) {

                System.out.println("updating row " + (count + 1));
                TableModel model = table.getModel();
                int cols = model.getColumnCount();
                int row = 0;
                for (int j = 0; j < cols; j++) {
                    row = count;
                    table.changeSelection(row, 0, false, false);
                    timer.setDelay(100);
                    Object value = "row " + (count + 1) + " item " + (j + 1);
                    model.setValueAt(value, count, j);
                }
                count++;
                if (count >= table.getRowCount()) {
                    timer.stop();
                    table.changeSelection(0, 0, false, false);
                    java.awt.EventQueue.invokeLater(new Runnable() {

                        @Override
                        public void run() {
                            table.clearSelection();
                            tableViewPort.bolStart = true;
                        }
                    });
                }
            }
        };
    }

    public static void main(String[] args) {
        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                ViewPortFlickeringOriginal viewPortFlickering = new ViewPortFlickeringOriginal();
            }
        });
    }
}

class GradientViewPortOriginal extends JScrollPane {

    private static final long serialVersionUID = 1L;
    private final int h = 50;
    private BufferedImage img = null;
    private BufferedImage shadow = new BufferedImage(1, h, BufferedImage.TYPE_INT_ARGB);
    private JViewport viewPort;
    public boolean bolStart = false;

    public GradientViewPortOriginal(JComponent com) {
        super(com);
        viewPort = this.getViewport();
        viewPort.setScrollMode(JViewport.BLIT_SCROLL_MODE);
        viewPort.setScrollMode(JViewport.BACKINGSTORE_SCROLL_MODE);
        viewPort.setScrollMode(JViewport.SIMPLE_SCROLL_MODE);
        paintBackGround(new Color(250, 150, 150));
    }

    public void paintBackGround(Color g) {
        Graphics2D g2 = shadow.createGraphics();
        g2.setPaint(g);
        g2.fillRect(0, 0, 1, h);
        g2.setComposite(AlphaComposite.DstIn);
        g2.setPaint(new GradientPaint(0, 0, new Color(0, 0, 0, 0f), 0, h,
                new Color(0.1f, 0.8f, 0.8f, 0.5f)));
        g2.fillRect(0, 0, 1, h);
        g2.dispose();
    }

    @Override
    public void paint(Graphics g) {
        if (img == null || img.getWidth() != getWidth() || img.getHeight() != getHeight()) {
            img = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB);
        }
        Graphics2D g2 = img.createGraphics();
        super.paint(g2);
        Rectangle bounds = getViewport().getVisibleRect();
        g2.scale(bounds.getWidth(), -1);
        int y = (getColumnHeader() == null) ? 0 : getColumnHeader().getHeight();
        g2.drawImage(shadow, bounds.x, -bounds.y - y - h, null);
        g2.scale(1, -1);
        g2.drawImage(shadow, bounds.x, bounds.y + bounds.height - h + y, null);
        g2.dispose();
        g.drawImage(img, 0, 0, null);
    }
}

但我能够演示 JScrollPane 的延迟滚动包含其他 JComponents，如 JTable 或 JList 或 JTextArea 或 JTextPane

import java.awt.Color;
import java.awt.Component;
import java.awt.GridLayout;
import java.awt.event.AdjustmentEvent;
import java.awt.event.AdjustmentListener;
import javax.swing.*;

public class ListPanel extends JFrame {

    private static final long serialVersionUID = 1L;

    public ListPanel() {
        setLayout(new GridLayout(0, 2, 10, 10));
        DefaultListModel model = new DefaultListModel();
        model.addElement(createButtons("one"));
        model.addElement(createButtons("two"));
        model.addElement(createButtons("three"));
        model.addElement(createButtons("four"));
        model.addElement(createButtons("five"));
        model.addElement(createButtons("six"));
        model.addElement(createButtons("seven"));
        model.addElement(createButtons("eight"));
        model.addElement(createButtons("nine"));
        model.addElement(createButtons("ten"));
        model.addElement(createButtons("eleven"));
        model.addElement(createButtons("twelwe"));
        JList list = new JList(model);
        list.setCellRenderer(new PanelRenderer());
        JScrollPane scroll1 = new JScrollPane(list);
        final JScrollBar scrollBar = scroll1.getVerticalScrollBar();
        scrollBar.addAdjustmentListener(new AdjustmentListener() {

            @Override
            public void adjustmentValueChanged(AdjustmentEvent e) {
                System.out.println("JScrollBar's current value = " + scrollBar.getValue());
            }
        });
        add(scroll1);
        JScrollPane scroll2 = new JScrollPane(createPanel());
        add(scroll2);        
        final JScrollBar scrollBar1 = scroll2.getVerticalScrollBar();
        scrollBar1.addAdjustmentListener(new AdjustmentListener() {

            @Override
            public void adjustmentValueChanged(AdjustmentEvent e) {
                System.out.println("JScrollBar's current value = " + scrollBar1.getValue());
            }
        });

    }

    public static JPanel createPanel() {
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(0, 1, 1, 1));
        panel.add(createButtons("one"));
        panel.add(createButtons("two"));
        panel.add(createButtons("three"));
        panel.add(createButtons("four"));
        panel.add(createButtons("five"));
        panel.add(createButtons("six"));
        panel.add(createButtons("seven"));
        panel.add(createButtons("eight"));
        panel.add(createButtons("nine"));
        panel.add(createButtons("ten"));
        panel.add(createButtons("eleven"));
        panel.add(createButtons("twelwe"));
        return panel;
    }

    public static JButton createButtons(String text) {
        JButton button = new JButton(text);
        return button;
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                ListPanel frame = new ListPanel();
                frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
                //frame.pack();
                frame.setSize(270, 200);
                frame.setVisible(true);
            }
        });
    }

    class PanelRenderer implements ListCellRenderer {

        @Override
        public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
            JButton renderer = (JButton) value;
            renderer.setBackground(isSelected ? Color.red : list.getBackground());
            return renderer;
        }
    }
}