JEditorPane，HTMLEditorKit - 自定义动作插入自定义标记

Question

我与JEditorPane相信。我需要简单的编辑器。我已经解决了加载和修改包含自定义（两个）标签的HTML的问题（请参阅my older post）。它正确显示文档，我现在甚至可以编辑它。我可以写文字，删除字符或我的自定义元素。我赢得了一场战斗，但还没有赢得战争。令人遗憾的是，下一步也是非常有问题的。我无法插入自定义标签。

我有一个自定义操作：

import my.own.HTMLEditorKit; //extends standard HTMLEditorKit 
import my.own.HTMLDocument; //extends standard HTMLDocument 

class InsertElementAction extends StyledTextAction { 
    private static final long serialVersionUID = 1L; 

    public InsertElementAction(String actionName) { 
     super(actionName); 
    } 

    @Override 
    public void actionPerformed(ActionEvent e) { 
     JEditorPane editor = getEditor(e); 

     if (editor == null) 
      return; 

     HTMLDocument doc = (HTMLDocument) editor.getDocument(); 
     HTMLEditorKit ekit = (HTMLEditorKit) editor.getEditorKit(); 
     int offset = editor.getSelectionStart(); 

     try { 
      ekit.insertHTML(doc, offset, "<span>ahoj</span>", 0, 0, HTML.Tag.SPAN); 
      Element ele = doc.getRootElements()[0]; 
      ele = ele.getElement(1).getElement(0); 
      doc.setInnerHTML(ele, "<bar medium=\"#DEFAULT\" type=\"packaged\" source=\"identifier\" />"); 
     } 
     catch (BadLocationException ble) { 
      throw new Error(ble); 
     } 
     catch (IOException ioe) { 
      throw new Error(ioe); 
     } 
    } 
} 

它workts正常。我可以插入span元素。但是我不能用这种方式插入非标准标签。我只能插入code，span等，但不能插入我的标签。对于我的标签我被迫使用：

ekit.insertHTML(doc, offset, "x<bar medium=\"#DEFAULT\" type=\"packaged\" source=\"identifier\" />x", 0, 0, null); 

有两个关键问题

1. 自定义标签必须与非whispace字符（在此，x）
2. 来界定当前元素的当我插入span元素为<p>paragraph</p>体拆分

，我得到<p>par<span>ahoj</span>agraph</p>预期。如何将未知标签全部插入body元素的子元素中，结果（例如未知标签x）为<p>par</p><x>ahoj</x><p>agraph</p>。

这项工作让人筋疲力尽。自从几周以来，我就相信这个相对简单的任务。我已经浪费了。如果插入不上班，我就废了...所有

Answer 1

我已经找到了解决办法。该标签被插入这样：

ModifiedHTMLDocument doc = (ModifiedHTMLDocument) editor.getDocument(); 
int offset = editor.getSelectionStart(); 
//insert our special tag (if the tag is not bounded with non-whitespace character, nothing happens) 
doc.insertHTML(offset, "-<specialTag />-"); 
//remove leading and trailing minuses 
doc.remove(offset, 1); //at the current position is the minus before tag inserted 
doc.remove(offset + 1, 1); //the next sign is minus after new tag (the tag is nowhere) 
//Note: no, you really cannot do that: doc.remove(offset, 2), because then the tag is deleted 

我ModifiedHTMLDocument包含方法insertHTML()，它调用由反射隐藏medhod：

public void insertHTML(int offset, String htmlText) throws BadLocationException, IOException { 
    if (getParser() == null) 
     throw new IllegalStateException("No HTMLEditorKit.Parser"); 

    Element elem = getCurrentElement(offset); 

    //the method insertHTML is not visible 
    try { 
     Method insertHTML = javax.swing.text.html.HTMLDocument.class.getDeclaredMethod("insertHTML", 
       new Class[] {Element.class, int.class, String.class, boolean.class}); 
     insertHTML.setAccessible(true); 
     insertHTML.invoke(this, new Object[] {elem, offset, htmlText, false}); 
    } 
    catch (Exception e) { 
     throw new IOException("The method insertHTML() could not be invoked", e); 
    } 
} 

我们的砖框的最后一块是一种方法寻找当前元素：

public Element getCurrentElement(int offset) { 
    ElementIterator ei = new ElementIterator(this); 
    Element elem, currentElem = null; 
    int elemLength = Integer.MAX_VALUE; 

    while ((elem = ei.next()) != null) { //looking for closest element 
     int start = elem.getStartOffset(), end = elem.getEndOffset(), len = end - start; 
     if (elem.isLeaf() || elem.getName().equals("html")) 
      continue; 
     if (start <= offset && offset < end && len <= elemLength) { 
      currentElem = elem; 
      elemLength = len; 
     } 
    } 

    return currentElem; 
} 

此方法也是ModifiedHTMLDocument类的成员。

该解决方案不纯，但它暂时解决了这个问题。我希望我会找到更好的套件。我正在考虑JWebEngine。这应该是目前可怜的HTMLEditorKit的替代品，但我不知道，它是否允许我添加自定义标签。

Answer 2

希望这有助于 http://java-sl.com/custom_tag_html_kit.html