问题描述
我有一个JTextPane组件，我正在尝试将用户键入的文本设置为同时加下划线和删除线。
I have a JTextPane component and I am trying to style the text that will be typed by the user to be both underline and strikethrough at the same time.
应该将下一个类型字符的删除线属性设置为true的相关代码片段为：
The relevant snippet of code that that should set the strikethrough attribute of the next typed character to true is this:
JEditorPane editor = getEditor(e);
if (editor != null) {
StyledEditorKit kit = getStyledEditorKit(editor);
MutableAttributeSet attr = kit.getInputAttributes();
SimpleAttributeSet sas = new SimpleAttributeSet();
StyleConstants.setStrikeThrough(sas, true);
setCharacterAttributes(editor, sas, false);
}
这样可以将文本设为删除线，但如果它已经设置为下划线，它丢失了下划线样式信息。仔细看看StyleConstants.setStrikeThrough（...）背后的实际代码我注意到下划线和删除线属性的CSS样式标签将是相同的（即文本装饰），当值更新时保存属性的哈希表，它将被覆盖。
This does style the text as strikethrough, but if it was already styled as underline, it loses the underline styling information. Taking a close look at the actual code behind StyleConstants.setStrikeThrough(...) I have noticed that the CSS styling tag for both underline and strikethrough attributes will be the same (i.e. "text-decoration") and when the value is updated in the hashtable holding the attributes, it will be overriden.
这意味着代码如下：
StyleConstants.setStrikeThrough(sas, true);
StyleConstants.setUnderlineThrough(sas, true);
将导致下一个打字字符加下划线而没有删除线。我检查了属性值，对于text-decoration属性，值是下划线，而我期待直通，下划线。
will result in the next typed character being underlined without a strikethrough. I've checked the attribute values and for the "text-decoration" attribute the value is "underline", whereas I was expecting "line-through,underline".
有谁知道如何以一个干净的Swing兼容方式实现这一目标？我的方法有问题吗？在JTextPane样式的核心是否有一个潜在的假设，即文本不应该同时删除和下划线？
Does anyone know how to achieve this in a clean Swing compliant way? Is there something wrong in my approach? Is there an underlying assumption at the core of JTextPane styling that text should not be strikethrough and underline at the same time?
推荐答案
为什么不使用 StyledDocument 并使用两个 Style ： primary 和 secondary ，其中 primary 是 secondary 的父样式：
Why not working with StyledDocument and using two Style: primary and secondary, where primary is parent style of secondary:
StyledDocument styleDocument = jTextPane1.getStyledDocument();
Style primaryStyle = styleDocument.addStyle("Primary", null);
Style secondaryStyle = styleDocument.addStyle("Secondary", primaryStyle);
StyleConstants.setFontFamily(primaryStyle, "American Captain");
StyleConstants.setFontSize(primaryStyle, 24);
// StyleConstants.setFontFamily(secondaryStyle, "Bira PERSONAL USE ONLY");
StyleConstants.setFontSize(secondaryStyle, 20);
StyleConstants.setForeground(primaryStyle, new Color(0x552AFF));
StyleConstants.setForeground(secondaryStyle, Color.black);
StyleConstants.setStrikeThrough(secondaryStyle, true);
StyleConstants.setUnderline(primaryStyle, true);
try {
styleDocument.insertString(0, "Title with American Captain font\n\n", primaryStyle);
styleDocument.insertString(styleDocument.getLength(), "Font demonstration with JTextPane. "
+ "Seriously, it is powerful and has the power to do all kind of styling with text. "
+ "check it out, check its mighty power and be embrassed\n", secondaryStyle);
} catch (BadLocationException ex) {
Logger.getLogger(JTextPaneTest.class.getName()).log(Level.SEVERE, null, ex);
}
修改：
是的，答案仍然在于使用 DefaultStyleDocument 并进行扩展。上面的例子应该让我们知道在插入带有 styleDocument.insertString（int offs，String str，AttributeSet a）的字符串时，方法。当我们使用 Style 的样式是如何工作的 KeyBoard 或复制粘贴插入数据时，关联 StyleDocument 的 insertString 函数总是被调用。
Yes, the answer still lies in the preference of using DefaultStyleDocument and extending it. The above example should give an idea how styling with Style works while inserting string with styleDocument.insertString(int offs, String str, AttributeSet a) method. When we are inserting data using KeyBoard or copy-paste the associating StyleDocument's insertString function always gets called.
因此，要像文本编辑器一样设置样式想要的，你所要做的就是扩展 DefaultStyleDocument 并覆盖这个 insertString 函数并传递你的特定样式属性想。
So, to style like a text editor as you are wanting, all you have to do is to extends the DefaultStyleDocument and override this insertString function and pass the specific style attribute you want.
满足您的完整要求的演示示例应该明确这一点。
A Demo example satisfying your complete requirement should make this things clear.
class CStyleDocument extends DefaultStyledDocument
{
private Style primaryStyle;
public CStyleDocument() {
super();
primaryStyle = this.addStyle("Primary", null);
}
public Style getAttrStyle()
{
return primaryStyle;
}
@Override
public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
super.insertString(offs, str, primaryStyle);
}
}
public class JTextPaneTest extends javax.swing.JFrame {
CStyleDocument styleDocument;
public JTextPaneTest() {
initComponents();
styleDocument = new CStyleDocument();
jTextPane1.setDocument(styleDocument);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
jTextPane1 = new javax.swing.JTextPane();
jPanel1 = new javax.swing.JPanel();
boldSelButton = new javax.swing.JToggleButton();
ulSelButton = new javax.swing.JToggleButton();
strkSelButton = new javax.swing.JToggleButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setMinimumSize(new java.awt.Dimension(400, 200));
jScrollPane1.setViewportView(jTextPane1);
getContentPane().add(jScrollPane1, java.awt.BorderLayout.CENTER);
boldSelButton.setText("Bold");
boldSelButton.addChangeListener(new javax.swing.event.ChangeListener() {
public void stateChanged(javax.swing.event.ChangeEvent evt) {
boldSelButtonStateChanged(evt);
}
});
jPanel1.add(boldSelButton);
ulSelButton.setText("Under Lined");
ulSelButton.addChangeListener(new javax.swing.event.ChangeListener() {
public void stateChanged(javax.swing.event.ChangeEvent evt) {
ulSelButtonStateChanged(evt);
}
});
jPanel1.add(ulSelButton);
strkSelButton.setText("Strike Through");
strkSelButton.addChangeListener(new javax.swing.event.ChangeListener() {
public void stateChanged(javax.swing.event.ChangeEvent evt) {
strkSelButtonStateChanged(evt);
}
});
jPanel1.add(strkSelButton);
getContentPane().add(jPanel1, java.awt.BorderLayout.PAGE_START);
pack();
}// </editor-fold>
private void boldSelButtonStateChanged(javax.swing.event.ChangeEvent evt) {
StyleConstants.setBold(styleDocument.getAttrStyle(), ((JToggleButton)evt.getSource()).isSelected());
jTextPane1.requestFocus();
}
private void ulSelButtonStateChanged(javax.swing.event.ChangeEvent evt) {
StyleConstants.setUnderline(styleDocument.getAttrStyle(), ((JToggleButton)evt.getSource()).isSelected());
jTextPane1.requestFocus();
}
private void strkSelButtonStateChanged(javax.swing.event.ChangeEvent evt) {
StyleConstants.setStrikeThrough(styleDocument.getAttrStyle(), ((JToggleButton)evt.getSource()).isSelected());
jTextPane1.requestFocus();
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
JFrame frame = new JTextPaneTest();
frame.setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JToggleButton boldSelButton;
private javax.swing.JPanel jPanel1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextPane jTextPane1;
private javax.swing.JToggleButton strkSelButton;
private javax.swing.JToggleButton ulSelButton;
// End of variables declaration
}
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