调整登录屏幕按钮的大小 [英] Resize the button of login screen

问题描述

我想调整按钮的大小.我怎样才能做到这一点?

我想将我的登录按钮和文本输入调整为小.我希望我的登录屏幕在中间显示得很好.

解决方案

首先尝试不同的布局管理器，而不是 GridLayout，例如 GridBagLayout:

backPanel = new JPanel(new BorderLayout());midPanel = new JPanel(new GridBagLayout());bottomPanel = new JPanel(new GridBagLayout());//bottomPanel.setLayout(new BorderLayout());//final FrameTestBase = new FrameTestBase();loginButton = new JButton("登录");bottomPanel.add(loginButton);usernameLabel = new JLabel(" 用户名:");passwordLabel = new JLabel(" 密码:");usernameText = new JTextField(20);passwordField = new JPasswordField(20);GridBagConstraints gbc = new GridBagConstraints();gbc.gridx = 0;gbc.gridy = 0;gbc.insets = new Insets(2, 2, 2, 2);midPanel.add(usernameLabel, gbc);gbc.gridx++;midPanel.add(usernameText, gbc);gbc.gridx = 0;gbc.gridy++;midPanel.add(passwordLabel, gbc);gbc.gridx++;midPanel.add(passwordField, gbc);bottomPanel.add(loginButton);backPanel.add(midPanel);backPanel.add(bottomPanel, BorderLayout.SOUTH);

查看在容器内布置组件 和 如何使用 GridBagLayout 了解更多详情.>

例如，您可以使用frame.setLocationRelativeTo(null);轻松地在屏幕中间显示一个窗口

import java.awt.BorderLayout;导入 java.awt.EventQueue;导入 java.awt.GridBagConstraints;导入 java.awt.GridBagLayout;导入 java.awt.Insets;导入 javax.swing.JButton;导入 javax.swing.JFrame;导入 javax.swing.JLabel;导入 javax.swing.JPanel;导入 javax.swing.JPasswordField;导入 javax.swing.JTextField;导入 javax.swing.UIManager;导入 javax.swing.UnsupportedLookAndFeelException;公共类登录示例{公共静态无效主(字符串 [] args){新的登录示例();}公共登录示例(){EventQueue.invokeLater(new Runnable() {@覆盖公共无效运行(){尝试 {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {ex.printStackTrace();}JFrame frame = new JFrame("测试");frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.add(new LoginPane());框架.pack();frame.setLocationRelativeTo(null);frame.setVisible(true);}});}公共类 LoginPane 扩展 JPanel {私人最终JPanel backPanel；私人最终 JPanel midPanel；私人最终 JPanel 底部面板；私有最终 JButton 登录按钮；私有最终 JLabel 用户名标签；私人最终 JLabel 密码标签；private final JTextField usernameText；私人最终 JPasswordField passwordField;公共登录窗格(){backPanel = new JPanel(new BorderLayout());midPanel = new JPanel(new GridBagLayout());bottomPanel = new JPanel(new GridBagLayout());loginButton = new JButton("登录");bottomPanel.add(loginButton);usernameLabel = new JLabel(" 用户名:");passwordLabel = new JLabel(" 密码:");usernameText = new JTextField(20);passwordField = new JPasswordField(20);GridBagConstraints gbc = new GridBagConstraints();gbc.gridx = 0;gbc.gridy = 0;gbc.insets = new Insets(2, 2, 2, 2);midPanel.add(usernameLabel, gbc);gbc.gridx++;midPanel.add(usernameText, gbc);gbc.gridx = 0;gbc.gridy++;midPanel.add(passwordLabel, gbc);gbc.gridx++;midPanel.add(passwordField, gbc);bottomPanel.add(loginButton);backPanel.add(midPanel);backPanel.add(bottomPanel, BorderLayout.SOUTH);setLayout(new BorderLayout());添加(后面板)；}}}

I want to resize the button. How can I do that?

I want to resize my login button to be small and my textinput. I want my log in screen to be display nice in middle.

解决方案

Start by trying different layout managers, other than GridLayout, like GridBagLayout for example:

backPanel = new JPanel(new BorderLayout());
midPanel = new JPanel(new GridBagLayout());
bottomPanel = new JPanel(new GridBagLayout());
//bottomPanel.setLayout(new BorderLayout());
//final FrameTestBase = new FrameTestBase();

loginButton = new JButton(" Login ");
bottomPanel.add(loginButton);

usernameLabel = new JLabel(" Username : ");
passwordLabel = new JLabel(" Password : ");

usernameText = new JTextField(20);
passwordField = new JPasswordField(20);

GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.insets = new Insets(2, 2, 2, 2);

midPanel.add(usernameLabel, gbc);
gbc.gridx++;
midPanel.add(usernameText, gbc);
gbc.gridx = 0;
gbc.gridy++;
midPanel.add(passwordLabel, gbc);
gbc.gridx++;
midPanel.add(passwordField, gbc);

bottomPanel.add(loginButton);
backPanel.add(midPanel);
backPanel.add(bottomPanel, BorderLayout.SOUTH);

Take a look at Laying Out Components Within a Container and How to Use GridBagLayout for more details.

You can easily display a window in the middle of the screen by using frame.setLocationRelativeTo(null);, for example

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class LoginExample {

    public static void main(String[] args) {
        new LoginExample();
    }

    public LoginExample() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new LoginPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class LoginPane extends JPanel {
        private final JPanel backPanel;
        private final JPanel midPanel;
        private final JPanel bottomPanel;
        private final JButton loginButton;
        private final JLabel usernameLabel;
        private final JLabel passwordLabel;
        private final JTextField usernameText;
        private final JPasswordField passwordField;

        public LoginPane() {
            backPanel = new JPanel(new BorderLayout());
            midPanel = new JPanel(new GridBagLayout());
            bottomPanel = new JPanel(new GridBagLayout());

            loginButton = new JButton(" Login ");
            bottomPanel.add(loginButton);

            usernameLabel = new JLabel(" Username : ");
            passwordLabel = new JLabel(" Password : ");

            usernameText = new JTextField(20);
            passwordField = new JPasswordField(20);

            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.insets = new Insets(2, 2, 2, 2);

            midPanel.add(usernameLabel, gbc);
            gbc.gridx++;
            midPanel.add(usernameText, gbc);
            gbc.gridx = 0;
            gbc.gridy++;
            midPanel.add(passwordLabel, gbc);
            gbc.gridx++;
            midPanel.add(passwordField, gbc);

            bottomPanel.add(loginButton);
            backPanel.add(midPanel);
            backPanel.add(bottomPanel, BorderLayout.SOUTH);

            setLayout(new BorderLayout());
            add(backPanel);
        }

    }

}

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