删除GridBagLayout中按钮周围的空间 [英] Removing space around buttons in GridBagLayout
问题描述
我有这个令人烦恼的来源，用于演示另一个问题中提到的游戏画面的布局。它将按钮（或标签，可在启动时选择）放入 GridBagLayout 。
I have this vexing source written to demonstrate a layout for a game screen mentioned on another question. It puts buttons (or labels, choosable at start-up) into a GridBagLayout.
如果您选择在提示时不使用按钮（在GUI出现之前），整个GUI都很好而且紧凑，没有间隙。但是如果你选择使用按钮，它（如果你的设置就像我的那样）看起来像这样..
If you choose to not use buttons when prompted (before the GUI appears) the entire GUI is nice and compact with no gaps. But if you choose to use buttons it will (if your set up is like mine) look something like this..
注意红色水平线。这是面板显示的BG颜色。当GUI使用标签时，不会看到这些行。稍微拉伸GUI以查看它甚至没有在每行之后放置一条红线（有九行） - 尽管每行使用按钮（相同的组件）。
Note the red horizontal lines. That is the BG color of the panel showing through. Those lines are not seen when the GUI uses labels. Stretch the GUI a bit to see that it is not even putting a red line after every row (there are nine rows) - though each row uses buttons (the same components).
如何在使用按钮时删除额外的垂直空间？
我认为它必须是我在配置时忘记做的事情按钮或行权重，但我无法弄清楚是什么！
I figure it must be something I'm forgetting to do when configuring the buttons or the row weights, but I cannot figure out what!
import java.awt.*;
import java.awt.image.BufferedImage;
import javax.swing.*;
import java.net.URL;
import javax.imageio.ImageIO;
public class SoccerField {
private JPanel ui = null;
int[] x = {0, 35, 70, 107, 142, 177, 212, 247, 282, 315};
int[] y = {0, 45, 85, 140, 180, 225, 265, 280, 320, 345};
boolean buttons;
SoccerField() {
initUI();
}
public void initUI() {
int result = JOptionPane.showConfirmDialog(ui, "Use buttons?");
buttons = result == JOptionPane.OK_OPTION;
if (ui != null) {
return;
}
ui = new JPanel(new GridBagLayout());
ui.setBackground(Color.RED);
try {
URL url = new URL("http://i.stack.imgur.com/9E5ky.jpg");
BufferedImage img = ImageIO.read(url);
BufferedImage field = img.getSubimage(100, 350, 315, 345);
BufferedImage[] bi = subSampleImageColumns(field);
BufferedImage[][] fieldParts = new BufferedImage[bi.length][];
for (int ii=0; ii<bi.length; ii++) {
fieldParts[ii] = subSampleImageRows(bi[ii]);
}
for (int ii=0; ii<fieldParts[0].length; ii++) {
for (int jj=0; jj<fieldParts.length; jj++) {
addImageToPanel(ui, fieldParts[ii][jj], ii, jj);
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
private void addImageToPanel(JPanel panel, BufferedImage img, int row, int col) {
Insets insets = new Insets(0,0,0,0);
GridBagConstraints gbc = new GridBagConstraints(
row, col,
1, 1,
.5, .5,
GridBagConstraints.CENTER,
GridBagConstraints.BOTH,
insets, 0, 0);
ImageIcon ii = new ImageIcon(img);
JButton b = new JButton(ii);
b.setBorder(null);
b.setBorderPainted(false);
b.setContentAreaFilled(false);
Component c = buttons ? b : new JLabel(ii);
panel.add(c, gbc);
}
private BufferedImage[] subSampleImageColumns(BufferedImage img) {
System.out.println("Image Size: " + img.getWidth() + "," + img.getHeight());
BufferedImage[] imageRows = new BufferedImage[x.length - 1];
for (int ii = 0; ii < x.length - 1; ii++) {
BufferedImage bi = img.getSubimage(
x[ii], 0, x[ii + 1] - x[ii], img.getHeight());
imageRows[ii] = bi;
}
return imageRows;
}
private BufferedImage[] subSampleImageRows(BufferedImage img) {
BufferedImage[] imageRows = new BufferedImage[y.length - 1];
for (int ii = 0; ii < y.length - 1; ii++) {
BufferedImage bi = img.getSubimage(
0, y[ii], img.getWidth(), y[ii + 1] - y[ii]);
imageRows[ii] = bi;
}
return imageRows;
}
public JComponent getUI() {
return ui;
}
public static void main(String[] args) {
Runnable r = new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception useDefault) {
}
SoccerField o = new SoccerField();
JFrame f = new JFrame(o.getClass().getSimpleName());
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
f.setLocationByPlatform(true);
f.setContentPane(o.getUI());
f.pack();
//f.setMinimumSize(f.getSize());
f.setVisible(true);
}
};
SwingUtilities.invokeLater(r);
}
}
推荐答案
注意到按钮的首选高度似乎没有正确计算按钮（在某些情况下）。
Noticed that the preferred height of the buttons doesn't seem to be calculated correctly for the buttons (in some cases).
在标签高度为40的情况下，按钮的高度为41.
In the cases where the height of the label is 40, the height of the button was 41.
它的按钮总是调整为奇数？
Its like the button will always resize to an odd number?
我更改了代码：
//int[] y = {0, 45, 85, 140, 180, 225, 265, 280, 320, 345};
int[] y = {0, 45, 86, 139, 180, 225, 266, 279, 320, 345};
它似乎有效。
啊，刚刚找到原因。您还需要：
Ah, just found the reason. You also need:
b.setFocusPainted(false);
这篇关于删除GridBagLayout中按钮周围的空间的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
