[英]How to add vertical scrollbar to Jpanel which is having SpringLayout in Java?
I have below snippet of code in which TestClass is extending jPanel which is using SpringLayout, in which I'm not able to add vertical scrollbar. 我在下面的代码段中,TestClass扩展了使用SpringLayout的jPanel,在其中我无法添加垂直滚动条。
Could you please help me guys? 你能帮我吗?
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();
}
}
I would sugest use of ScrollPane
我建议使用
ScrollPane
ScrollPane mainWindow = new ScrollPane(ScrollPane.SCROLLBARS_AS_NEEDED); mainWindow.add(this);
but You would have to use another object than Your TestClass
as view, here it would be mainWindow
. 但是您必须使用
TestClass
以外的其他对象作为视图,这里是mainWindow
。
You could use also JScrollPane from Swing: tutorial for JScrollPane 您也可以使用Swing 中的JScrollPane : JScrollPane教程
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