使用Grid/FlowLayout的JProgressbar宽度 [英] JProgressbar width using Grid/FlowLayout

问题描述

我正在开发一个看起来像这样的下载器:

I'm working on a downloader which looks like this at the moment:

JFrame使用BorderLayout. 在北方，我有一个JPanel(FlowLayout).在SOUTH中也有一个JPanel(FlowLayout)，在WEST中我只有一个JTextArea(在JScrollPane中).这一切都正确显示.但是，在EAST中，我目前有一个JPanel(GridLayout(10，1)).

The JFrame uses a BorderLayout. In the NORTH, I have a JPanel(FlowLayout). In the SOUTH there is also a JPanel(FlowLayout), in the WEST I just have a JTextArea (in a JScrollPane). This is all shown correctly. However, in the EAST I currently have a JPanel(GridLayout(10, 1)).

我想在EAST部分显示最多10个JProgressBar，这些JProgressBar是动态添加到面板上或从面板上删除的.问题是，我无法让它们看起来像我想要的样子:我希望JProgressBars的宽度填满整个EAST部分，因为1)这使应用程序看起来更对称，并且2)ProgressBars可能包含目前不适合使用的长字符串.我试过将包含GridLayout(10，1)的JPanel放在一个布局中，然后将该布局放在EAST部分中，但是那也不起作用.

I want to show up to 10 JProgressBars in the EAST section which are added and removed from the panel dynamically. The problem is, I can not get them to look like I want to them to look: I want the JProgressBars' width to fill up the entire EAST section because 1) This gives the app a more symmetrical look and 2) The ProgressBars may contain long strings that don't fit at the moment. I've tried putting the JPanel that contains the GridLayout(10, 1) in a flowlayout and then put that flowlayout in the EAST section, but that didn't work either.

我的代码(SSCCE)当前如下:

My code (SSCCE) is currently as follows:

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashMap;
import java.util.Map;

public class Main {

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

    private static class DownloadFrame extends JFrame {

        private JButton downloadButton;
        private JTextField threadIdTextField;
        private JTextArea downloadStatusTextArea;
        private JScrollPane scrollPane;
        private JTextField downloadLocationTextField;
        private JButton downloadLocationButton;

        private JPanel North;
        private JPanel South;
        private JPanel ProgressBarPanel;

        private Map<String, JProgressBar> progressBarMap;

        public DownloadFrame() {
            InitComponents();
            InitLayout();
            AddComponents();
            AddActionListeners();

            setVisible(true);
            setSize(700, 300);
        }

        private void InitComponents() {
            downloadButton = new JButton("Dowload");
            threadIdTextField = new JTextField(6);
            downloadStatusTextArea = new JTextArea(10, 30);
            scrollPane = new JScrollPane(downloadStatusTextArea, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
            downloadLocationTextField = new JTextField(40);
            downloadLocationButton = new JButton("...");
            North = new JPanel();
            South = new JPanel();
            ProgressBarPanel = new JPanel();
            progressBarMap = new HashMap<String, JProgressBar>();
        }

        private void InitLayout() {
            North.setLayout(new FlowLayout());
            South.setLayout(new FlowLayout());
            ProgressBarPanel.setLayout(new GridLayout(10, 1));
        }

        private void AddComponents() {
            North.add(threadIdTextField);
            North.add(downloadButton);
            add(North, BorderLayout.NORTH);

            add(ProgressBarPanel, BorderLayout.EAST);

            South.add(downloadLocationTextField);
            South.add(downloadLocationButton);
            add(South, BorderLayout.SOUTH);

            add(scrollPane, BorderLayout.WEST);
        }

        private void AddActionListeners() {
            downloadButton.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    addNewProgessBar(threadIdTextField.getText());
                }
            });
        }

        public void addNewProgessBar(String threadId) {
            JProgressBar progressBar = new JProgressBar();
            progressBar.setStringPainted(true);
            progressBarMap.put(threadId, progressBar);
            drawProgessBars();
        }

        void drawProgessBars() {
            ProgressBarPanel.removeAll();
            for (JProgressBar progressBar : progressBarMap.values()) {
                ProgressBarPanel.add(progressBar);
            }
            validate();
            repaint();
        }

    }
}

谢谢.

EDIT

EDIT

最简单的解决方案:更改

Easiest solution: change

add(ProgressBarPanel, BorderLayout.EAST);

到

add(ProgressBarPanel, BorderLayout.CENTER);

推荐答案

import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashMap;
import java.util.Map;

public class Main {

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

    private static class DownloadFrame extends JFrame {

        private JButton downloadButton;
        private JTextField threadIdTextField;
        private JTextArea downloadStatusTextArea;
        private JScrollPane scrollPane;
        private JTextField downloadLocationTextField;
        private JButton downloadLocationButton;

        private JPanel North;
        private JPanel South;
        private JPanel ProgressBarPanel;

        private Map<String, JProgressBar> progressBarMap;

        public DownloadFrame() {
            InitComponents();
            AddComponents();
            AddActionListeners();

            pack();
            setVisible(true);
            //setSize(700, 300);
        }

        private void InitComponents() {
            setLayout(new BorderLayout());
            downloadButton = new JButton("Dowload");
            threadIdTextField = new JTextField(6);
            downloadStatusTextArea = new JTextArea(10, 30);
            scrollPane = new JScrollPane(downloadStatusTextArea, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
            downloadLocationTextField = new JTextField(40);
            downloadLocationButton = new JButton("...");
            North = new JPanel(new FlowLayout());
            South = new JPanel(new FlowLayout());
            ProgressBarPanel = new JPanel(new GridLayout(0, 1));
            ProgressBarPanel.setBorder(new LineBorder(Color.black));
            ProgressBarPanel.setPreferredSize(new Dimension(300,20));
            progressBarMap = new HashMap<String, JProgressBar>();
        }

        private void AddComponents() {
            North.add(threadIdTextField);
            North.add(downloadButton);
            add(North, BorderLayout.NORTH);

            add(ProgressBarPanel, BorderLayout.EAST);

            South.add(downloadLocationTextField);
            South.add(downloadLocationButton);
            add(South, BorderLayout.SOUTH);

            add(scrollPane, BorderLayout.WEST);
        }

        private void AddActionListeners() {
            downloadButton.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    addNewProgessBar(threadIdTextField.getText());
                }
            });
        }

        public void addNewProgessBar(String threadId) {
            JProgressBar progressBar = new JProgressBar();
            progressBar.setStringPainted(true);
            progressBarMap.put(threadId, progressBar);
            drawProgessBars();
        }

        void drawProgessBars() {
            ProgressBarPanel.removeAll();
            for (JProgressBar progressBar : progressBarMap.values()) {
                ProgressBarPanel.add(progressBar);
            }
            validate();
            repaint();
        }

    }
}

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