如何设置JSlider的大小? [英] How to set size of a JSlider?

问题描述

我在网上搜索了此问题的解决方案，但没有找到任何有效的方法.

I have searched the web for a solution to this problem and didn't find anything that worked.

我在 JPanel 中有一个垂直 JSlider，它使用 GridBagLayout 和 GridBagConstraints 来定位面板上的对象.

I have a vertical JSlider inside a JPanel that uses GridBagLayout and a GridBagConstraints for positioning the objects on the panel.

目前我有以下代码:

    gbc.gridy = 1;
    add(button1,gbc);

    gbc.gridy = 2;
    add(button2,gbc);

    gbc.gridy = 3;
    add(slider,gbc);

对象沿面板垂直放置.

滑块始终以相同的大小(长度)显示.尝试使用 setPreferredSize - 没有用.试图使用 gridheight 以便必须跨两行滑块 - 也不起作用.尝试更改滑块的实际最小值和最大值，但没有帮助.

The slider always appears in the same size (length). Tried to use setPreferredSize - didn't work. Tried to use gridheight in order to have to slider cross two rows - didn't work either. Tried to change the actual min and max values of the slider, didn't help.

GridBagLayout 不应该尊重首选大小吗?

还尝试在主 JPanel 内创建另一个 JPanel，将其布局设置为 FlowLayout、BoxLayout 或 GridLayout，并将滑块添加到其中.没有改变任何事情.很奇怪.

Also tried creating anoter JPanel inside the main JPanel, set it's layout to FlowLayout, BoxLayout or GridLayout, and add the slider to it. Didn't change a thing. Very weird.

有什么想法吗?

推荐答案

使用不同的布局管理器(或将滑块放在具有不同布局管理器的嵌套 JPanel 中)，这将 拉伸 JSlider.在示例中，我使用 BorderLayout

Use a different layout manager (or put the slider in a nested JPanel with a different layout manager), that will stretch the JSlider. In the example I use BorderLayout

import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.SwingUtilities;

public class DifferentSizeSlider extends JPanel{
    public DifferentSizeSlider() {
        JPanel topPanel = new JPanel(new BorderLayout());
        topPanel.add(new JSlider());

        JPanel bottomPanel = new JPanel(new GridLayout(1, 2));
        bottomPanel.add(new JSlider());
        bottomPanel.add(new JPanel());

        setLayout(new GridLayout(2, 1));
        add(topPanel);
        add(bottomPanel);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable(){
            public void run() {
                JOptionPane.showMessageDialog(null, new DifferentSizeSlider());
            }
        });
    }
}

<小时>

编辑与您的代码示例

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JButton;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.SwingUtilities;

public class DifferentSizeSlider extends JPanel{
    public DifferentSizeSlider() {
        JPanel topPanel = new JPanel(new BorderLayout());
        topPanel.setPreferredSize(new Dimension(400, 50));
        topPanel.add(new JSlider());

        JButton jbtOne = new JButton("Button");
        JButton jbtTwo = new JButton("Button");

        GridBagConstraints gbc = new GridBagConstraints();
        setLayout(new GridBagLayout());

        gbc.gridy = 0;
        add(jbtOne,gbc);  

        gbc.gridy = 1;
        add(jbtTwo,gbc);

        gbc.gridy = 2;
        add(topPanel, gbc);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable(){
            public void run() {
                JOptionPane.showMessageDialog(null, new DifferentSizeSlider());
            }
        });
    }
}

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