Question

Messaging GUI

我的程序存在这个问题，我似乎无法弄清楚为什么会发生这种情况。应该发生的是，当你输入下面输入区域中的某个东西时，它应该采取并将它放在黑线实际上是textarea框的位置。通常它的工作原理除外，当我将editable设置为false和换行设置时，会发生这种情况，并且大小应该在整个面板上延伸到图像。我已经在相关代码下面了。我已经绞尽脑汁几个小时，需要一个新的视角。

private JTextArea message  = new JTextArea(5,20);
private JLabel date = new JLabel();
private ImageIcon img = new ImageIcon(getClass().getResource("/assignment1/img/silhouette.png"));   
private JLabel ImageLabel = new JLabel();



public MessagePanel(String pmessage, Date timestamp) {
    this.setLayout(new GridBagLayout());
    this.setBorder(BorderFactory.createLineBorder(new Color(0, 0, 0)));
    this.setPreferredSize(new Dimension(550,150));

    ImageLabel.setBorder(BorderFactory.createLineBorder(new Color(0, 0, 0)));
    message.setBorder(BorderFactory.createLineBorder(new Color(0, 0, 0)));
    ImageLabel.setIcon(img);

    message.setEditable(false);
    message.append(pmessage);
    message.setLineWrap(true);
    message.setWrapStyleWord(true);
    message.setCaretPosition(message.getDocument().getLength());
    //message.setText(pmessage);
    message.setPreferredSize(new Dimension(400,100));


    SimpleDateFormat f = new SimpleDateFormat("dd/MM/yyyy hh:mm a");
    date.setText(f.format(timestamp));

    GridBagConstraints messageConst = new GridBagConstraints();
    messageConst.gridx = 0;
    messageConst.gridy = 0;
    messageConst.fill = GridBagConstraints.HORIZONTAL;


    //messageConst.anchor = java.awt.GridBagConstraints.NORTHWEST;
    messageConst.insets = new Insets(12, 83, 0, 0);

    GridBagConstraints iconConst = new GridBagConstraints();
    iconConst.gridx = 1;
    iconConst.gridy = 0;
    iconConst.anchor = java.awt.GridBagConstraints.NORTHWEST;
    iconConst.insets = new Insets(49, 425, 0, 11);

    GridBagConstraints dateConst = new GridBagConstraints();
    dateConst.gridx = 0;
    dateConst.gridy = 1;
    dateConst.gridwidth = 2;
    dateConst.ipadx = 70;
    dateConst.anchor = GridBagConstraints.NORTHWEST;
    dateConst.insets = new Insets(6, 460,0, 11);

    this.add(message,messageConst);
    this.add(date,dateConst);
    this.add(ImageLabel,iconConst);
}

Answer 1

不要使用可能影响dateConst.ipadx = 70;尊重文字区域首选大小的GridBagLayout，而是尝试使用messageConst.weightx = 1;。

问题可能是GridBagLayout查看了文本区域的可用空间，并确定没有足够的空间来支持它的首选大小，并决定使用它的最小尺寸（通常不是很大））

<强>更新

所以我快速浏览了一下代码并想出了这个......

enter image description here

要记住的事情，insest增加给定细胞的重量，使其变大，这将推动其他细胞周围，而不是总是很好。

EAST位于右侧，WEST位于左侧;）

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.LineBorder;

public class TestTextArea100 {

    public static void main(String[] args) {
        new TestTextArea100();
    }

    public TestTextArea100() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

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

    public class TestPane extends JPanel {

        private JTextArea message = new JTextArea(5, 20);
        private JLabel date = new JLabel();
        private JLabel ImageLabel = new JLabel();

        public TestPane() {
            this.setLayout(new GridBagLayout());
            this.setBorder(BorderFactory.createLineBorder(new Color(0, 0, 0)));
            this.setPreferredSize(new Dimension(550, 150));

            ImageLabel.setBorder(BorderFactory.createLineBorder(new Color(0, 0, 0)));
            message.setBorder(BorderFactory.createLineBorder(new Color(0, 0, 0)));
            ImageLabel.setText(":)");
            ImageLabel.setBorder(new LineBorder(Color.RED));

            message.setEditable(false);
            message.append("Blah");
            message.setLineWrap(true);
            message.setWrapStyleWord(true);
            message.setCaretPosition(message.getDocument().getLength());
            //message.setText(pmessage);
            message.setPreferredSize(new Dimension(400, 100));

            SimpleDateFormat f = new SimpleDateFormat("dd/MM/yyyy hh:mm a");
            date.setText(f.format(new Date()));

            GridBagConstraints messageConst = new GridBagConstraints();
            messageConst.gridx = 0;
            messageConst.gridy = 0;
            messageConst.weightx = 1;
            messageConst.weighty = 1;
            messageConst.fill = GridBagConstraints.BOTH;

            messageConst.insets = new Insets(12, 12, 12, 12);

            GridBagConstraints iconConst = new GridBagConstraints();
            iconConst.gridx = 1;
            iconConst.gridy = 0;
            iconConst.insets = new Insets(12, 12, 12, 12);

            GridBagConstraints dateConst = new GridBagConstraints();
            dateConst.gridx = 0;
            dateConst.gridy = 1;
            dateConst.gridwidth = 2;
            dateConst.anchor = GridBagConstraints.EAST;

            this.add(message, messageConst);
            this.add(date, dateConst);
            this.add(ImageLabel, iconConst);
        }
    }

}

Textarea在不可编辑且换行符合时无法正常工作

1 个答案: