停止Swing中事件的默认行为 [英] Stopping default behavior of events in Swing

问题描述

<$ p $

我通过点击发送按钮调用一个方法中的下列代码，或者在一段代码中的消息文本字段中输入。 p> //在类ChatWindow
private void messageTextAreaKeyPressed（java.awt.event.KeyEvent evt）{//由Netbeans GUI设计器创建的调用此方法的事件处理程序。
if（evt.getKeyCode（）== java.awt.event.KeyEvent.VK_ENTER）{
sendMessage（）;
}
}
public void sendMessage（）{
String currentMessage = messageTextArea.getText（）;
addMessage（你，currentMessage）;
app.sendMessage（currentMessage，1）;
messageTextArea.setText（）;
}


最后一位代码将空白文本区域。但是，通过按Enter按钮发送消息而不是空，文本框包含换行符。

我的猜测是，在我的事件处理程序运行后，那么正在添加换行符。如何停止添加换行符？

解决方案

尝试添加 evt.consume（） code> sendMessage（）

  private void messageTextAreaKeyPressed（java.awt.event.KeyEvent evt）{
 if（evt.getKeyCode（）== java.awt.event.KeyEvent.VK_ENTER）{
 sendMessage（）; 
 evt.consume（）; 
} 
} 
  

I have the following bit of code in a method called by clicking the send button, or pressing enter in the message text field in a piece of code.

// In class ChatWindow
private void messageTextAreaKeyPressed(java.awt.event.KeyEvent evt) { // Event handler created by Netbeans GUI designer to call this method.           
    if(evt.getKeyCode() == java.awt.event.KeyEvent.VK_ENTER) {
        sendMessage();
    }
}   
public void sendMessage() {
    String currentMessage = messageTextArea.getText();
    addMessage("You", currentMessage);
    app.sendMessage(currentMessage, 1);
    messageTextArea.setText("");
}

The last bit of code blanks the text area. However, after a message is sent by pressing the enter button, rather than being empty, the text box contains a newline.

My guess is that after my event handler runs, THEN the newline character is being added. How to I stop the newline being added?

解决方案

try adding evt.consume() after your call to sendMessage()

private void messageTextAreaKeyPressed(java.awt.event.KeyEvent evt) { 
 if(evt.getKeyCode() == java.awt.event.KeyEvent.VK_ENTER) {
    sendMessage();
    evt.consume();
 }
}  

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