Question

我遇到了上述方法的奇怪行为。有一个遗留组件用于显示xml文件内容，它在java6中工作，但是当我切换到1.7_10时，它失败，因为结束偏移超出了视图的界限。

我对此问题进行了一些研究，发现以下方法javax.swing.text.ParagraphView.findEdgeSpan（View，int，int，int，int）

这是方法的代码：

/**
 * Binary search for the longest non-breakable fragment at the view edge.
 */
private float findEdgeSpan(View v, int axis, int fp, int p0, int p1) {
    int len = p1 - p0;
    if (len <= 1) {
        // further fragmentation is not possible
        return v.getMinimumSpan(axis);
    } else {
        int mid = p0 + len / 2;
        boolean startEdge = mid > fp;
        // initial view is breakable hence must support fragmentation
        View f = startEdge ?
            v.createFragment(fp, mid) : v.createFragment(mid, fp);
        boolean breakable = f.getBreakWeight(
                axis, 0, f.getMaximumSpan(axis)) > View.BadBreakWeight;
        if (breakable == startEdge) {
            p1 = mid;
        } else {
            p0 = mid;
        }
        return findEdgeSpan(f, axis, fp, p0, p1);
    }
}

它创建视图的片段然后在此片段上运行，但偏移边界取自外部视图。传递给createFragment的债券可能会超出f边界。

有人可以解释这是否是正确的行为？

在javax.swing.text.View.createFragment的javadoc中：

Parameters:
    p0 the starting offset >= 0. This should be a value greater or equal to the element starting offset and less than the element ending offset.
    p1 the ending offset > p0. This should be a value less than or equal to the elements end offset and greater than the elements starting offset.

据我所知，p1不应该大于view的endOffset，不是吗？

javax.swing.text.View.createFragment java7中的奇怪行为

0 个答案: