Java Code Examples for javax.swing.JTextArea#setSelectionStart()

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Example 1

Source File: MainView.java From HiJson with Apache License 2.0

4 votes

/**
 * 文本内容查找定位
 * @param key 要查找的字符串
 * @param ignoreCase 是否区分大小写
 * @param down  查找方向（向上false，向下true）
 * @param isFirst 是否从开头开始查找
 * @return
 */
public boolean startSegmentFindOrReplaceOperation(JTextArea textArea, String key, boolean ignoreCase, boolean down,boolean isFirst) {
    int length = key.length();
    Document doc = textArea.getDocument();
    int offset = textArea.getCaretPosition();
    int charsLeft = doc.getLength() - offset;
    if(charsLeft <=0 ){
        offset = 0;
        charsLeft = doc.getLength() - offset;
    }
    if (!down) {
        offset -= length;
        offset--;
        charsLeft = offset;
    }
    if(isFirst){
        offset = 0;
        charsLeft = doc.getLength() - offset;
    }
    Segment text = new Segment();
    text.setPartialReturn(true);
    try {
        while (charsLeft > 0) {
            doc.getText(offset, length, text);
            if ((ignoreCase == true && text.toString().equalsIgnoreCase(key))
                    || (ignoreCase == false && text.toString().equals(key))) {
                textArea.requestFocus();////焦点,才能能看到效果
                textArea.setSelectionStart(offset);
                textArea.setSelectionEnd(offset + length);
                return true;
            }
            charsLeft--;
            if (down) {
                offset++;
            } else {
                offset--;
            }

        }
    } catch (Exception e) {

    }
    return false;
}