如何设置一个按钮的大小？ [英] How can I set size of a button?

问题描述

我把我的按钮在网格布局一个JPane。然后，我把的JPanel与BoxLayout.Y_AXIS其他的JPanel。我想在GridLayout的按钮，不散。我用tmp.setSize（30,30），它不工作。我也尝试使用新的网格布局（X，Y，4,4），但我无法找出X和Y。那么，什么是做这个东西的正确方法？

I put my buttons in a JPane with GridLayout. Then I put JPanel into another JPanel with BoxLayout.Y_AXIS. I want buttons in the GridLayout to be square. I use tmp.setSize(30,30) and it does not work. I also try to use new GridLayout(X, Y, 4, 4) but I cannot figure out what X and Y are. So, what is the correct way to do this stuff?

新增：

我还是解决不了问题。这里是什么我试图做code：

I still cannot solve the problem. Here is the code of what I am trying to do:

import javax.swing.*;
import java.awt.*;

public class PanelModel {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Colored Trails");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel mainPanel = new JPanel();
        mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));

        JPanel firstPanel = new JPanel();
        firstPanel.setLayout(new GridLayout(4, 4));
        JButton btn;
        for (int i=1; i<=4; i++) {
            for (int j=1; j<=4; j++) {
                btn = new JButton();
                btn.setPreferredSize(new Dimension(100, 100));
                firstPanel.add(btn);
            }
        }

        JPanel secondPanel = new JPanel();
        secondPanel.setLayout(new GridLayout(5, 13));
        for (int i=1; i<=5; i++) {
            for (int j=1; j<=13; j++) {
                btn = new JButton();
                btn.setPreferredSize(new Dimension(40, 40));
                secondPanel.add(btn);
            }
        }

        mainPanel.add(firstPanel);
        mainPanel.add(secondPanel);
        frame.add(mainPanel);

        frame.setSize(400,600);
        frame.setVisible(true);
    }
}

问题是Java试图使 firstPanel 和 secondPanel 相等的宽度！此外，Java的尝试以填充窗口的所有高度。如何删除这种行为？

The problem is that Java tries to make width of the firstPanel and secondPanel equal! Moreover, Java tries to to fill all height of the window. How can I remove this behavior?

推荐答案

code的下位做你问什么。只要确保你分配足够的空间，以便在按钮上的文字变为可见

The following bit of code does what you ask for. Just make sure that you assign enough space so that the text on the button becomes visible

JFrame frame = new JFrame("test");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
JPanel panel = new JPanel(new GridLayout(4,4,4,4));

for(int i=0 ; i<16 ; i++){
    JButton btn = new JButton(String.valueOf(i));
    btn.setPreferredSize(new Dimension(40, 40));
    panel.add(btn);
}
frame.setContentPane(panel);
frame.pack();
frame.setVisible(true);

的X和Y（在GridLayout的构造的两个第一参数）指明在网格（分别）的行和列的数目。您可以让其中一个为0，如果您希望这个值是无限的。

The X and Y (two first parameters of the GridLayout constructor) specify the number of rows and columns in the grid (respectively). You may leave one of them as 0 if you want that value to be unbounded.

修改

我修改所提供的code，我相信现在符合所期望的那样：

I've modified the provided code and I believe it now conforms to what is desired:

JFrame frame = new JFrame("Colored Trails");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JPanel mainPanel = new JPanel();
mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));

JPanel firstPanel = new JPanel();
firstPanel.setLayout(new GridLayout(4, 4));
firstPanel.setMaximumSize(new Dimension(400, 400));
JButton btn;
for (int i=1; i<=4; i++) {
    for (int j=1; j<=4; j++) {
        btn = new JButton();
        btn.setPreferredSize(new Dimension(100, 100));
        firstPanel.add(btn);
    }
}

JPanel secondPanel = new JPanel();
secondPanel.setLayout(new GridLayout(5, 13));
secondPanel.setMaximumSize(new Dimension(520, 200));
for (int i=1; i<=5; i++) {
    for (int j=1; j<=13; j++) {
        btn = new JButton();
        btn.setPreferredSize(new Dimension(40, 40));
        secondPanel.add(btn);
    }
}

mainPanel.add(firstPanel);
mainPanel.add(secondPanel);
frame.setContentPane(mainPanel);

frame.setSize(520,600);
frame.setMinimumSize(new Dimension(520,600));
frame.setVisible(true);

基本上我现在设置板的preferred大小和该帧的最小尺寸。

Basically I now set the preferred size of the panels and a minimum size for the frame.

这篇关于如何设置一个按钮的大小？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！