Question

我正在尝试为我的即时通讯程序创建一个自定义聊天对话窗口。对话框由一个带有JFrame和一些额外属性的单独类组成。我可以创建JFrame和几个组件（发送消息按钮，用于键入消息的文本字段，以及应该包含我的JTextPane的滚动窗格）。不幸的是，JTextPane不会出现，只有滚动窗格的灰色框（我假设它是什么）。

以下是我的自定义对话窗口的代码。包裹instantmessenger;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.text.Document;


public class ChatDialogue extends JComponent{
private BuddyConversation owner;


/** COMPONENTS *****************************/
private JFrame window;
private javax.swing.JButton btnSendMessage;
private javax.swing.JLabel jLabel1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextPane textMessages;
private javax.swing.JTextField textNewMessage;
/*******************************************/


public ChatDialogue(String username, BuddyConversation owner){
    this.owner = owner;
    initComponents(username);
}
private void btnSendMessageActionPerformed(java.awt.event.ActionEvent evt){
    owner.addMessage(textNewMessage.getText());
}
public javax.swing.JTextPane getMessageBox(){
    return textMessages;
}
private void initComponents(String toUser){
    window = new JFrame();
    window.setAlwaysOnTop(true);
    window.setBounds(new java.awt.Rectangle(0, 0, 200, 400));
    window.setMaximizedBounds(new java.awt.Rectangle(0, 0, 200, 12312312));
    window.setMaximumSize(new java.awt.Dimension(200, 12312312));
    window.setMinimumSize(new java.awt.Dimension(200, 375));
    window.setTitle("Chat with " + toUser);

    textMessages = new javax.swing.JTextPane();
    jScrollPane1 = new javax.swing.JScrollPane(textMessages);
     jLabel1 = new javax.swing.JLabel();
    textNewMessage = new javax.swing.JTextField();
    btnSendMessage = new javax.swing.JButton();

    javax.swing.GroupLayout windowLayout = new javax.swing.GroupLayout(window.getContentPane());
    window.getContentPane().setLayout(windowLayout);
    windowLayout.setHorizontalGroup(
        windowLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(windowLayout.createSequentialGroup()
            .addContainerGap()
            .addGroup(windowLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jScrollPane1)
                .addComponent(textNewMessage)
                .addGroup(windowLayout.createSequentialGroup()
                    .addGroup(windowLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jLabel1)
                        .addComponent(btnSendMessage))
                    .addGap(0, 29, Short.MAX_VALUE)))
            .addContainerGap())
    );
    windowLayout.setVerticalGroup(
        windowLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(windowLayout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 198, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(jLabel1)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(textNewMessage, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addComponent(btnSendMessage)
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
    );
    btnSendMessage.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btnSendMessageActionPerformed(evt);
        }
    });
    /** ADD COMPONENTS TO JFRAME ******************************************/
    //window.getContentPane().add(jLabel1);
    //window.getContentPane().add(jScrollPane1);
    //window.getContentPane().add(textNewMessage);
    //window.getContentPane().add(btnSendMessage);
    //window.add(textMessages);
    /**********************************************************************/

    jScrollPane1.setViewportView(textMessages);

    jLabel1.setText("Put your message her and then hit enter or something or press the button");

    btnSendMessage.setText("Send Message");

    jScrollPane1.setVisible(true);
    textMessages.setVisible(true);
    window.invalidate();
    window.repaint();
    window.pack();
    window.revalidate();
    window.setVisible(true);
    }
}

所以现在就像我之前所说的那样，唯一显示的是灰色轮廓，其中文本和滚动窗格应该去。我在主GUI中的设计编辑器中创建了JFrame设计，然后将自动生成的代码复制并粘贴到我的自定义类中......

底部的代码只是让我一直在努力让它发挥作用。我本来可以把它改成普通的文本字段或其他东西并让它起作用，但我不能不知道我做错了什么。非常感谢帮助。

Answer 1

window.setBounds(new java.awt.Rectangle(0, 0, 200, 400));
window.setMaximizedBounds(new java.awt.Rectangle(0, 0, 200, 12312312));
window.setMaximumSize(new java.awt.Dimension(200, 12312312));
window.setMinimumSize(new java.awt.Dimension(200, 375));

请参阅Should I avoid the use of set(Preferred|Maximum|Minimum)Size methods in Java Swing?（是）。

所以上面应该是：

window.pack();
window.setMinimumSize(window.getSize()); //this is a rare exception to the rule

请注意，帧将在屏幕的坐标0,0（左上角）结束。对于帧定位，您无法前往setLocationByPlatform(true)。有关演示，请参阅this answer。

Answer 2

安德鲁·汤普森关于setBounds的指针就是为我解决了这个问题。删除对setBounds和setMaximumBounds的调用以某种方式清除了我的textpane所遇到的一些特定于平台的问题。对于其他人来说，原始代码显然工作正常。谢谢！

JTextPane内部没有显示动态添加的JFrame

2 个答案: