BorderFactory 和 Metal L&F 问题

Question

我看到了一个奇怪的行为。 L&F 套装是金属。

UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");

如果我在 JPanel 上设置了 Border border1，然后我在同一个 JPanel 上将 Border 更改为 border2，当工具提示在 border2 上传递时，重绘会重绘 border1。这仅发生在 L&F Metal 上，带有 LineBorder、TitledBorder....

Answer 1

public class BorderTest {

private JFrame jFrame;
private Container contentPane;
private ColorsBoard colorsBoard;

public BorderTest() {
    super();

    ToolTipManager.sharedInstance().setInitialDelay(10);
    ToolTipManager.sharedInstance().setDismissDelay(1500);
    jFrame = new JFrame();

    contentPane = jFrame.getContentPane();
    contentPane.setLayout(new BorderLayout());

    jFrame.setPreferredSize(new Dimension(700, 500));
    colorsBoard = new ColorsBoard();
    contentPane.add(colorsBoard, BorderLayout.CENTER);

    JLabel label = new JLabel(""
            + "<html>Click two or three small squares. <br/>"
            + "LineBorder's are set. <br/>"
            + "Then pass the tooltips over the red borders. <br/>"
            + "The red LineBorders' are back to blue. <br/>"
            + "This phenomen appears only in Metal L&F. </html>");
    contentPane.add(label, BorderLayout.EAST);

    jFrame.pack();
    jFrame.setVisible(true);
}

public static void main(String[] args) {
     try {
            UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");

        new BorderTest();
    } catch (Exception e) {
            e.printStackTrace();
    }
}
}

class ColorsBoard extends JPanel {

private int squareSize = 315;
private int horizontal = 8;    //number of squares H
private int vertical = 8;      //number of squares V

private SquaredPanel[] squarePanels;   
int index = 0;
public int lastClickedSquare = -1;

// the chess board like JPanel.

public ColorsBoard() {
    squarePanels= new SquaredPanel[horizontal * vertical];
    this.setPreferredSize(new Dimension(squareSize, squareSize));
    setLayout(null);
}

// fill with squares (SquaredPanel)

protected synchronized void paintComponent(Graphics g) {
    super.paintComponent(g);

    int tileSizeH = squareSize / horizontal;
    int tileSizeV = squareSize / vertical;

    g.setColor(Color.LIGHT_GRAY);
    g.fillRect(0, 0, getWidth(), getHeight());

    for(int i = 0; i < horizontal*vertical; i++) {
        squarePanels[i] = new SquaredPanel(this);
    }

    index = 0;
    for (int i = 0; i < horizontal; i++) {
        for (int j = 0; j < vertical; j++) {
                if(index == horizontal * vertical) break;
                    squarePanels[index].setBackground(Color.gray);
                    squarePanels[index].setSize(tileSizeH - 1, tileSizeV - 1);
                    squarePanels[index].setLocation(i * tileSizeH, j * tileSizeV);
                    squarePanels[index].setName("index " + index);
                    squarePanels[index].setIndex(index);
                    add(squarePanels[index]);
                    index++;
            }
        }
    }

public void eraseLastBlueBorder(int lastClickedSquare2) {
    if (lastClickedSquare == -1) {
        lastClickedSquare = lastClickedSquare2;
        return;
    }
    if(!squarePanels[lastClickedSquare].isRed)(squarePanels[lastClickedSquare]).cleanBorder();
    lastClickedSquare = lastClickedSquare2;
}
}

class SquaredPanel extends JPanel {

private String name;
protected Boolean isRed = false;
private int index;
private Border theBorder =  (new LineBorder(Color.gray, 2));

protected Border getTheBorder() {
    return theBorder;
}

public SquaredPanel(ColorsBoard colorsBoard) {
    super();

    addMouseListener(new MouseListener(){
        public void mouseClicked(MouseEvent e) {
        }
        public void mousePressed(MouseEvent e) {
        }
        public void mouseReleased(MouseEvent e) {
            colorsBoard.eraseLastBlueBorder(index);
            setTitleBorder("RED");
        }
        public void mouseEntered(MouseEvent e) {
            setToolTipText(name);
        }
        public void mouseExited(MouseEvent e) {
            setToolTipText(null);
        }
      });
}

// the setBorder call
    protected void setTitleBorder(String title) {
        theBorder = (new LineBorder(title == "BLUE" ? Color.red : Color.blue, 2));
        setBorder(theBorder);
    }


public synchronized void cleanBorder() {
    setTitleBorder("BLUE");
}

public void setName(String name) {
    this.name = name;
}

public void setIndex(int k) {
    index = k;
}
}

Answer 2

happens in Metal L&F only.

即使你没有专门设置LAF，你还是有问题。

If I set a Border border1 on a JPanel, then I change the Border to border2 on the same JPanel, when a tooltip passes on border2, repaint redraws border1

与工具提示无关。

只需点击几个方块，然后调整框架大小，所有边框都会重新涂成蓝色。

问题出在你的ColorsBoardclass.

您不应覆盖 paintComponent() 方法来创建组件。

一个画法只用于画画

只要 Swing 确定需要重新绘制组件，就会调用 paintComponent() 方法。这就是调整框架大小也会导致问题的原因。您正在重新创建所有组件。

解决方法：

不要覆盖 paintComponent() 方法！
在 class
不要使用空布局。而是在面板上使用 GridLayout 并将您的方块添加到网格中。
在构造函数中使用setBackground(Color.LIGHT_GRAY)设置背景

还有：

删除方法中的所有 synchronized 关键字。不需要它们。
不要使用“==”来比较对象。使用equals(...)方法。

BorderFactory 和 Metal L&F 问题

BorderFactory and Metal L&F issues

java

swing

border