Question

我有一个createUI（）函数，可以将JPanel加载到NORTH，SOUTH，EAST。

private void createUI() {
    add(createToolBar(), BorderLayout.NORTH);
    add(createDataView(), BorderLayout.SOUTH);
    add(createHistoryView(), BorderLayout.EAST);

    createMenuBar();

    setTitle("My Application");

}

每个组件都显示在正确的位置，但是，它们都是固定大小的JPanel。我想知道JPanel是否可以完全填充BorderLayout区域。

例如，createDataView（）是一个带表的简单Jpanel。我希望它能够水平扩展，并且具有固定的高度。

private JPanel createDataView(){
        JPanel panel = new JPanel();

        String data[][] = {{"001","vinod","Bihar","India","Biology","65","First"},
                           {"002","Raju","ABC","Kanada","Geography","58","second"},
                           {"003","Aman","Delhi","India","computer","98","Dictontion"},
                           {"004","Ranjan","Bangloor","India","chemestry","90","Dictontion"},
                           {"004","Ranjan","Bangloor","India","chemestry","90","Dictontion"}};
        String col[] = {"Roll","Name","State","country","Math","Marks","Grade"};
        JTable table = new JTable(data,col);
        table.setPreferredScrollableViewportSize(new Dimension(900,100));
        JTableHeader header = table.getTableHeader();
        header.setBackground(Color.yellow);
        JScrollPane pane = new JScrollPane(table);
        table.setAutoResizeMode(JTable.WIDTH);
        table.doLayout();
        panel.add(pane);
        return panel;
}

现在我依靠手动设置尺寸。但是，我想获得当前窗口宽度，并将其设置如下。

table.setPreferredScrollableViewportSize(new Dimension(900,100));

Answer 1

新JPanel的默认布局为FlowLayout; GridLayout可能是数据视图的替代方案。您可以比较A Visual Guide to Layout Managers中的可能性。

JPanel panel = new JPanel(new GridLayout(1, 0));

附录：你的setAutoResizeMode()看起来很可疑; JTable.WIDTH ~~不可能~~只是巧合的有效值。 GridLayout适用于默认值JTable.AUTO_RESIZE_SUBSEQUENT_COLUMNS，但您可以尝试使用其他设置。

table.setAutoResizeMode(JTable.WIDTH);

Answer 2

使用borderlayout，NORTH，SOUTH，EAST和WEST边框都采用包含面板的默认大小，但CENTER会扩展到占用所有剩余空间。我建议将createDataView放在布局的这一部分。

Java Swing：相对定位和自动调整大小？

2 个答案: