如何在JEditorPane中更改HTMLDocument的特定元素的颜色? [英] How can I change the color of a particular element of a HTMLDocument in a JEditorPane?
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问题描述
我基本上想实现将鼠标悬停在链接上时更改其颜色的功能.当我将鼠标悬停在链接上时触发的HyperlinkEvent将HTML元素交给我,但是它不允许我在其上设置任何样式属性,而且我不知道如何获取具有可设置属性的元素.
I basically want to implement changing the color of the links when I hover over them. The HyperlinkEvent that is triggered when I mouse over the link hands me the HTML element, but it won't let me set any style attributes on it, and I can't figure out how to get the elements that do have settable attributes.
推荐答案
我想出了我想要使用样式化文档以及HTMLEditorKit提供的一些帮助来完成的工作:
I figured out what I wanted to do using styled documents and bit of help from the HTMLEditorKit:
public class HighlightHyperlinkExample {
private static Element lastHyperlinkElementEntered;
private static JEditorPane textPane;
public static void main(String[] args) {
textPane = new JEditorPane();
textPane.setContentType(new HTMLEditorKit().getContentType());
JScrollPane scrollPane = new JScrollPane(textPane);
textPane.setText(
"Sample text with <a href=\"x\">a link</a> and another <a href=\"x\">link</a>.");
initListeners();
JFrame frame = new JFrame();
frame.add(scrollPane);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
private static void initListeners() {
textPane.addMouseListener(new MouseAdapter() {
@Override
public void mouseExited(MouseEvent e) {
removeHyperlinkHighlight();
}
});
textPane.addMouseMotionListener(new MouseMotionListener() {
public void mouseDragged(MouseEvent e) {
}
public void mouseMoved(MouseEvent e) {
Point pt = new Point(e.getX(), e.getY());
int pos = textPane.viewToModel(pt);
if (pos >= 0) {
HTMLDocument hdoc = (HTMLDocument) textPane.getDocument();
Element elem = hdoc.getCharacterElement(pos);
if (elem != null) {
AttributeSet a = elem.getAttributes();
AttributeSet anchor = (AttributeSet) a.getAttribute(HTML.Tag.A);
if (anchor != null) {
//only highlight anchor tags
highlightHyperlink(elem);
} else {
removeHyperlinkHighlight();
}
}
}
}
});
}
private static void removeHyperlinkHighlight() {
changeColor(lastHyperlinkElementEntered, Color.BLUE);
lastHyperlinkElementEntered = null;
}
private static void highlightHyperlink(Element hyperlinkElement) {
if (hyperlinkElement != lastHyperlinkElementEntered) {
lastHyperlinkElementEntered = hyperlinkElement;
changeColor(hyperlinkElement, Color.RED);
}
}
private static void changeColor(Element el, Color color) {
if (lastHyperlinkElementEntered != null) {
HTMLDocument doc = (HTMLDocument) textPane.getDocument();
int start = el.getStartOffset();
int end = el.getEndOffset();
StyleContext ss = doc.getStyleSheet();
Style style = ss.addStyle("HighlightedHyperlink", null);
style.addAttribute(StyleConstants.Foreground, color);
doc.setCharacterAttributes(start, end - start, style, false);
}
}
}
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