Java GridBagConstraints异常

Question

我在尝试执行此代码时遇到异常：java.lang.IllegalArgumentException: cannot add to layout: constraints must be a GridBagConstraint：

    //creating the right splitpane
    JSplitPane sp = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
    GridBagLayout paneLayout = new GridBagLayout();
    sp.setLayout(paneLayout);
    sp.setContinuousLayout(true);
    sp.setDividerLocation(100);

    //setting constraints
    c = this.setConstraints(GridBagConstraints.ABOVE_BASELINE_TRAILING, GridBagConstraints.NORTH, 1, 1, 2, 2, .5, .5, new Insets(1,1,1,1), 5, 5);
    paneLayout.setConstraints(treeView, c);
    c = this.setConstraints(GridBagConstraints.BELOW_BASELINE_TRAILING, GridBagConstraints.SOUTH, 0, 0, 2, 2, .5, .5, new Insets(1,1,1,1), 5, 5);
    paneLayout.setConstraints(info, c);

    //adding components
    sp.setTopComponent(treeView); // Line with the error
    sp.setBottomComponent(info);

setConstraints执行此操作：

private GridBagConstraints setConstraints(int fill, int anchor, int gheight, int gwidth, int x, int y, double d, double e, Insets insets, int padx, int pady){
    GridBagConstraints c = new GridBagConstraints();
    c.fill = fill;
    c.anchor = anchor;
    c.gridheight = gheight;
    c.gridwidth = gwidth;
    c.gridx = x;
    c.gridy = y;
    c.weightx = d;
    c.weighty = e;
    c.insets = insets;
    c.ipadx = padx;
    c.ipady = pady;
    return c;   
}

我认为我要么缺少一些简单的东西，要么就是一个更大的错误，我无法做任何事情。你说什么？

MirroredFate

Answer 1

JSplitPane有自己的布局管理器 - 你不应该将它改为GridBagLayout。如果要在窗格中使用GridBagLayout，请创建一个JPanel以放入JSplitPane，并将该面板的布局设置为GridBagLayout。然后将面板放在JSplitPane和面板中的控件中。