在Java文本框中设置文本颜色 [英] Set the text color in a Java textbox

问题描述

如何在运行时在Java Swing文本框中设置文本的颜色？在启动时，颜色是灰色的，当用户输入文本框时，我希望将颜色更改为正常的文本颜色。我目前使用以下代码：

How does one set the color of text in a Java Swing textbox at run-time? At startup, the color is grayish and when the user enters the textbox, I wish to change the color to the normal text color. I am currently using the following code:

private void txtScheduleInfoFocusGained(java.awt.event.FocusEvent evt)                                            
    {                                                
        try
        {
            if (currentClassIsNewClass() && txtScheduleInfo.getDocument().getText(0, txtScheduleInfo.getDocument().getLength()).equals(PASTE_SI_HERE))
            {
                txtScheduleInfo.setText("");
                txtScheduleInfo.setForeground(java.awt.SystemColor.textText);
            }
        }
        catch (BadLocationException ex)
        {
            JOptionPane.showMessageDialog(this, "BLE\nContact Zian", "Unexpected Problem", JOptionPane.ERROR_MESSAGE);
        }
    }  

此时，当代码运行时，

At this time, when the code runs, the text still shows up in gray.

其他代码：

声明（作为字段）：

Additional Code:
Declaration (as a field):

   private javax.swing.JTextPane txtScheduleInfo;

实例化：

txtScheduleInfo = new javax.swing.JTextPane();

初始化：

txtScheduleInfo.setForeground(java.awt.SystemColor.textInactiveText);
txtScheduleInfo.setText("Paste schedule information here");
txtScheduleInfo.addFocusListener(new java.awt.event.FocusAdapter() {
    public void focusGained(java.awt.event.FocusEvent evt) {
        txtScheduleInfoFocusGained(evt);
    }
    public void focusLost(java.awt.event.FocusEvent evt) {
        txtScheduleInfoFocusLost(evt);
    }
});

推荐答案

private void txtScheduleInfoFocusGained(java.awt.event.FocusEvent evt)                                            
    {                                                
        try
        {
            if (currentClassIsNewClass() && txtScheduleInfo.getDocument().getText(0, txtScheduleInfo.getDocument().getLength()).equals(PASTE_SI_HERE))
            {
                txtScheduleInfo.setForeground(java.awt.SystemColor.textText);
                txtScheduleInfo.setText("");
            }
        }
        catch (BadLocationException ex)
        {
            JOptionPane.showMessageDialog(this, "BLE\nContact Zian", "Unexpected Problem", JOptionPane.ERROR_MESSAGE);
        }
    }

（唯一的变化是交换订单。 '在清除文本之前设置前景颜色。）

(The only change is swapping the order. Now you're setting the foreground colour before clearing the text.)

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