java - gridbaglayout垂直间隙

Question

我正在制作一个带有一些按钮的面板。

但我希望按钮相互接触，换句话说，我希望垂直间隙消失。但不应调整按钮的大小。我该如何继续执行此操作？

我的代码:

this.setLayout(new GridBagLayout());
    GridBagConstraints constraints = new GridBagConstraints();

    constraints.fill = GridBagConstraints.HORIZONTAL;
    constraints.gridwidth = 2;
    constraints.weightx = 1D;
    constraints.weighty = 1D;
    constraints.gridx = 0;
    constraints.gridy = 0;
    int row = 0;
    for (MainAction actie : mainActions) {
        constraints.gridy = row;
        row++;
        SelectedActionButton but = new SelectedActionButton(selectedActionModel, actie);
        this.add(but, constraints);

    }
    constraints.gridwidth = 1;
    constraints.weightx = 0.5D;
    row *=2;
    for (AbstractAction actie : objectActions) {
        constraints.gridy = row/2;
        constraints.gridx = row%2;
        row++;
        SelectedObjectButton but = new SelectedObjectButton(selectedObjectModel, actie);
        but.setMargin(new Insets(0, 0, 0, 0));
        this.add(but, constraints);
    }

提前致谢

Answer 1

更改以下行

constraints.weighty = 1D;

至

constraints.weighty = 0D;

将解决您的问题。

更新:要将所有按钮向北对齐，您可以在最后一行添加一个额外的组件，占用所有可用空间:

constraints.weighty = 1D;
constraints.gridy = row;
this.add(Box.createGlue(), constraints);