水平滚动条不适用于 JScrollPane

Question

这是我的带有 Miglayout 的应用程序插件：

这是MigLayout初始化代码，布局占主面板的100%space：

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");

问题是左侧列表的水平滚动条不起作用，这是带有 BoxLayout 的 JPanel，即使我为它调用了 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，即使它在底部有额外空 space 的副作用。如何让滚动条正常工作？

Answer 1

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

不要对首选尺寸进行硬编码。

每个组件将dynamcially根据组件的属性（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，并在需要时显示滚动条。

此外，在您将所有组件添加到面板后，您还需要使用：

panel.revalidate();

调用布局管理器以便计算面板的新尺寸。

水平滚动条不适用于 JScrollPane

Horisontal scrollbar not working for JScrollPane

java

swing

jscrollpane

miglayout