我们如何在GridLayout中显示网格线？ [英] How do we show the gridline in GridLayout?

问题描述

我们如何在GridLayout中显示网格线？在Java？

How do we show the gridline in GridLayout? in Java?

JPanel panel = new JPanel(new GridLayout(10,10));
panel.setBorder(BorderFactory.createEmptyBorder(2,2,2,2));

for (int i =0; i<(10*10); i++){
   panel.add(new JLabel("Label"));
}

推荐答案

我会尝试这样做通过在添加组件时为组件添加边框。这样做的简单方法就是使用 BorderFactory.createLineBorder（），如下所示：

I would try to do it by adding borders to the components as they are added. The simple way to do it is just using BorderFactory.createLineBorder(), like this:

JPanel panel = new JPanel(new GridLayout(10,10));
panel.setBorder(BorderFactory.createEmptyBorder(2,2,2,2));

for (int i =0; i<(10*10); i++){
    final JLabel label = new JLabel("Label");
    label.setBorder(BorderFactory.createLineBorder(Color.BLACK));
    panel.add(label);
}

然而，这将使细胞之间的边界比边缘更厚面板，因为外边缘只有一个像素厚的边框，内边缘将有两个一像素厚的边框。要解决此问题，您可以使用 BorderFactory.createMatteBorder（）仅在任何地方绘制一个像素宽的边框：

However, that will give you thicker borders between the cells than at the edges of the panel, because the outer edges will only have a one-pixel thick border and the inside edges will have two one-pixel thick borders together. To work around that, you can use BorderFactory.createMatteBorder() to only draw one-pixel-wide borders everywhere:

final int borderWidth = 1;
final int rows = 10;
final int cols = 10;
JPanel panel = new JPanel(new GridLayout(rows, cols));
panel.setBorder(BorderFactory.createEmptyBorder(2,2,2,2));

for (int row = 0; row < rows; row++) {
    for (int col = 0; col < cols; col++) {
        final JLabel label = new JLabel("Label");
        if (row == 0) {
            if (col == 0) {
                // Top left corner, draw all sides
                label.setBorder(BorderFactory.createLineBorder(Color.BLACK));
            }
            else {
                // Top edge, draw all sides except left edge
                label.setBorder(BorderFactory.createMatteBorder(borderWidth, 
                                                                0, 
                                                                borderWidth, 
                                                                borderWidth, 
                                                                Color.BLACK));
            }
        }
        else {
            if (col == 0) {
                // Left-hand edge, draw all sides except top
                label.setBorder(BorderFactory.createMatteBorder(0, 
                                                                borderWidth, 
                                                                borderWidth, 
                                                                borderWidth, 
                                                                Color.BLACK));
            }
            else {
                // Neither top edge nor left edge, skip both top and left lines
                label.setBorder(BorderFactory.createMatteBorder(0, 
                                                                0, 
                                                                borderWidth, 
                                                                borderWidth, 
                                                                Color.BLACK));
            }
        }
        panel.add(label);
    }
}

这应该给你宽度<$ c $的边框c> borderWidth 无处不在，单元格之间和外边缘。

This should give you borders of width borderWidth everywhere, both between cells and along the outside edges.

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