Question

我有以下代码片段，其中TestClass正在扩展使用SpringLayout的jPanel，其中我无法添加垂直滚动条。

你能帮帮我们吗？



        public class TestClass extends JPanel {

            private SpringLayout layout;
            private Spring s, sprWest;
            private JComboBox comboDevice = new JComboBox();
            private JComboBox comboCommand = new JComboBox();
            private JLabel lblDevice = new JLabel("Select the Device:");
            private JLabel lblCommand = new JLabel("Select Command:");
            private JButton btnCommand = new JButton("Save");

            public TestClass () {
                layout = new SpringLayout();
                s = Spring.constant(0, 60, 60);
                setLayout(layout);
            }

            public void populateFields(){
                add(lblCommand);
                add(comboCommand);


                sprLblEast = Spring.sum(s, Spring.max(layout.getConstraints(lblCommand).getWidth(), layout.getConstraints(lblDevice).getWidth()));
                Spring strut = Spring.constant(10);

                layout.putConstraint(SpringLayout.NORTH, lblCommand, strut, SpringLayout.SOUTH, comboDevice);
                layout.putConstraint(SpringLayout.NORTH, comboCommand, strut, SpringLayout.SOUTH, comboDevice);
                layout.putConstraint(SpringLayout.EAST, lblCommand, sprLblEast, SpringLayout.WEST, this);
                layout.putConstraint(SpringLayout.WEST, comboCommand, Spring.sum(s, layout.getConstraints(lblCommand).getWidth()), SpringLayout.WEST, lblCommand);
                layout.putConstraint(SpringLayout.EAST, this, sprLblEast, SpringLayout.WEST, comboCommand);

                List cmdList = getCommandList();
                for (int index = 0; index < cmdList.size(); index++) {
                    comboCommand.addItem(cmdName);
                }
                validate();
                repaint();
            }
    }

Answer 1

我会使用ScrollPane

ScrollPane mainWindow = new ScrollPane(ScrollPane.SCROLLBARS_AS_NEEDED); mainWindow.add(this);

但您必须使用除TestClass之外的其他对象作为视图，此处为mainWindow。

你也可以使用Swing的JScrollPane：tutorial for JScrollPane

如何将垂直滚动条添加到Java中具有SpringLayout的Jpanel？

1 个答案: