问GridBagLayout单元格中对象的对齐方式
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Stack Overflow用户

提问于 2018-12-05 23:17:40

回答 1查看 56关注 0票数 0

我正在尝试学习如何使用JAVA的GUI库Swing。我正在尝试做的是在一行中放置2个磁盘图像，并在它们下面的一行中放置3个打印机图像。每个磁盘图像应位于两个打印机图像的中间。我(不幸的是)正在使用GridBagLayout来实现这一点。我试图构建一个12列的网格，让每个打印机取4个，每个磁盘取6个。然后，我尝试将对象的锚点设置为GridBagConstraints.PAGE_END，这样图像就位于单元的底部中间部分。无论我做什么，我都不能让磁盘正确地对齐，我花了大量的时间试图解决这个问题。

下面是我创建对象的函数：

private void placeIcon(Container pane, GridBagConstraints c, int x, int y, String imagePath,
                               String imageLabel, int gridWidth) {
    BufferedImage printerIcon;
    try {
        printerIcon = ImageIO.read(new File(imagePath));
    } catch (IOException e) {
        e.printStackTrace();
        return;
    }

    JLabel textLabel = new JLabel(imageLabel + Integer.toString(x + 1),
                                SwingConstants.CENTER);
    JPanel iconPanel = new JPanel();
    iconPanel.setLayout(new GridBagLayout());
    textLabel.setPreferredSize(new Dimension(100,10));

    GridBagConstraints iconConstr = new GridBagConstraints();
    iconConstr.gridx = 0;
    iconConstr.gridy = 0;
    iconConstr.insets = new Insets(10, 3, 1, 3);
    iconConstr.anchor = GridBagConstraints.PAGE_END;
    iconConstr.weightx = 1;
    iconConstr.weighty = 1;
    iconPanel.add(textLabel, iconConstr);

    JLabel iconLabel = new JLabel(new ImageIcon(printerIcon));
    iconLabel.setPreferredSize(new Dimension(250,250));
    iconConstr.gridx = 0;
    iconConstr.gridy = 1;
    iconConstr.insets = new Insets(1, 3, 1, 3);
    iconConstr.anchor = GridBagConstraints.PAGE_END;
    iconConstr.weightx = 1;
    iconConstr.weighty = 1;
    iconPanel.add(iconLabel, iconConstr);

    c.gridx = x;
    c.gridy = y;
    c.weightx = 1;
    c.weighty = 1;
    c.anchor = GridBagConstraints.PAGE_END;
    c.gridwidth = gridWidth;
    c.insets = new Insets(25, 10, 1, 10);
    pane.add(iconPanel, c);
}

像这样调用它来创建打印机和磁盘映像：

    private void placeAllPrinterIcons(Container pane, GridBagConstraints c, int yPos) {
    String imgPath = "bin/images/printer_icon.png";
    String label = "Printer ";
    placeIcon(pane, c, 0, yPos, imgPath, label, 4);
    placeIcon(pane, c, 4, yPos, imgPath, label, 4);
    placeIcon(pane, c, 8, yPos, imgPath, label, 4);
}

private void placeAllDiskIcons(Container pane, GridBagConstraints c, int yPos) {
    String imgPath = "bin/images/disk_icon.png";
    String label = "Disk ";
    placeIcon(pane, c, 0, yPos, imgPath, label, 6);
    placeIcon(pane, c, 6, yPos, imgPath, label, 6);
}

        Container pane = getContentPane();
    pane.setLayout(new GridBagLayout());

    GridBagConstraints c = new GridBagConstraints();
    c.fill = GridBagConstraints.HORIZONTAL;

    placeAllDiskIcons(pane, c, 0);
    placeAllPrinterIcons(pane, c, 1);

当前的GUI如下所示，标签需要修复：