java - 水平滚动条不适用于 JScrollPane

问题描述

这是我的 Miglayout 应用程序插件：

这是 MigLayout 的初始化代码，布局占用主面板 100% 的空间：

resPanel.setLayout(new BoxLayout(resPanel, BoxLayout.Y_AXIS));
mainPanel.setLayout(new MigLayout("", "[][grow][grow][]", "[][][][grow]"));
mainPanel.add(new JLabel("Class expression"), "wrap");
mainPanel.add(owlDescriptionEditor, "growx,span 3");
mainPanel.add(calcButton, "wrap");
mainPanel.add(new JLabel("Definitions found"), "span 2");
mainPanel.add(new JLabel("Target signature"), "span 2,wrap");
JScrollPane jsp = new JScrollPane(resPanel);
mainPanel.add(jsp, "growy, growx, span 2");
jsp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
mainPanel.add(new JScrollPane(deltaList), "growx,growy,span 2");

问题不在于左侧列表的水平滚动条，即带有 BoxLayout 的 JPanel，即使我为此调用了 setVerticalScrollBarPolicy。JPanel 使用此循环动态填充：

static void updateList(JPanel panel, Collection<OWLClassExpression> list) {
    panel.removeAll();
    for (int i = 0; i < 3; i++) {
        for (OWLClassExpression p : list) {
            String name = ((OWLNamedObject) p).getIRI().getShortForm();
            JEditorPane jep = new JEditorPane("text/html", name+"QWQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ");
            jep.setPreferredSize(new Dimension(200,20));
            jep.setEditable(false);
            jep.setOpaque(false);
            panel.add(jep);
        }
    }
    panel.add( Box.createVerticalStrut(400) );
}

我必须添加最后一行才能使垂直滚动条正常工作。如果我不添加它，那么它也会丢失，即使它具有底部额外空白空间的副作用。如何使滚动条正常工作？

标签： javaswingjscrollpanemiglayout

jep.setPreferredSize(new Dimension(200,20));

不要硬编码首选尺寸。

每个组件将根据组件dynamcially的属性（文本、字体等）确定自己的首选大小。

然后布局管理器可以dynamically根据每个组件的首选大小确定面板的大小，并在需要时出现滚动条。

此外，在您完成将所有组件添加到您需要使用的面板后：

panel.revalidate();

调用布局管理器，以便计算面板的新大小。

java - 水平滚动条不适用于 JScrollPane

问题描述

解决方案

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