java - Java Swing 的荧光笔如何在边缘情况下工作？

Question

我有这个代码:

JTextArea textComp;

Highlighter hilite = textComp.getHighlighter();

if (word.toString().equals(pattern[i])) 
{
    hilite.addHighlight(posStart, (posEnd), myHighlighter);
    break;
}

word 是一个 StringBuilder

假设 if 中的条件匹配并且 hilite.addHighlight(posStart, (posEnd), myHighlighter); - 该语句将被执行。 然后 textComp 包含

int myVar

我尝试像这样突出显示

int myVar

当时，posStart = 0 和 posEnd = 3。但是当我在 textArea 中输入一些内容时，荧光笔会像这样延伸到末尾:

int myVar

谁能帮我解决这个问题吗？

如果我发表声明:

hilite.addHighlight(posStart, (posEnd-1), myHighlighter);

然后使用posStart=0, posEnd=3，然后仅

*in*t myVar this happens. i.e "in" is highlighted but "t" is not!

编辑 功能:

Highlighter.HighlightPainter myHighlighter = new MyHighlightPainter(
                    Color.LIGHT_GRAY);

            try {
                Highlighter hilite = textComp.getHighlighter();
                Document doc = textComp.getDocument();
                String text = doc.getText(0, doc.getLength());
                String[] words = text.split(" ");

                                int posEnd, posStart = 0;
                while (text.length() > posStart) {
                    posEnd = posStart;
                    StringBuilder word = new StringBuilder();
                    while (posEnd < text.length() && text.charAt(posEnd) != ' ') {
                        word.append(text.charAt(posEnd++));
                    }
                    for (int i = 0; i < pattern.length; i++) {

                        if (word.toString().equals(pattern[i])) {
                            hilite.addHighlight(posStart, (posEnd-1), myHighlighter);
                            break;
                        }

                    }
                    posStart = posStart + posEnd + 1;
                }
            } catch (BadLocationException e) {
            }

Answer 1

actually I was wondering how this Highlighter works!

是的，API 令人困惑。我相信第一个索引是包容性的，最后一个索引是排除性的。

每当我在搜索单词时突出显示时，我都会使用如下代码:

String text = "one two three four...";
String search "three";

int offset = text.indexOf(search);

if (offset != -1)
    textPane.getHighlighter().addHighlight(offset, offset + search.length(), painter);