我需要确保当我选择一个特定的单选按钮时,会出现一个包含三个JSpinner和三个JLabel的JPanel。
我写了这段代码:
JRadioButton custom = new JRadioButton("Custom");
SpinnerModel spinnerModel = new SpinnerNumberModel(2, 0, 80, 1);
JSpinner height = new JSpinner(spinnerModel);
SpinnerModel spinnerModel2 = new SpinnerNumberModel(2, 0, 80, 1);
JSpinner width = new JSpinner(spinnerModel2);
SpinnerModel spinnerModelMine = new SpinnerNumberModel(1, 0, 99, 1);
JSpinner mines = new JSpinner(spinnerModelMine);
当我选择自定义JRadioButton时,应显示此JPanel:
GroupLayout panelEstGroupLayout = new GroupLayout(panelEst);
panelEstGroupLayout.setHorizontalGroup(
panelEstGroupLayout.createParallelGroup(Alignment.LEADING)
.addGroup
(
panelEstGroupLayout.createSequentialGroup()
.addGap(5)
.addGroup
(
panelEstGroupLayout.createParallelGroup(Alignment.TRAILING)
.addComponent(startGame)
.addComponent(boxTotal, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
)
)
.addGroup
(
panelEstGroupLayout.createSequentialGroup()
.addContainerGap()
.addGroup
(
panelEstGroupLayout.createParallelGroup(Alignment.TRAILING)
.addGroup
(
Alignment.LEADING, panelEstGroupLayout.createSequentialGroup()
.addGap(6)
.addComponent(heightLabel, GroupLayout.PREFERRED_SIZE, 74, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.UNRELATED)
.addComponent(widthLabel, GroupLayout.PREFERRED_SIZE, 74, GroupLayout.PREFERRED_SIZE)
.addGap(18)
.addComponent(minesLabel, GroupLayout.PREFERRED_SIZE, 74, GroupLayout.PREFERRED_SIZE)
)
.addGroup
(
Alignment.LEADING, panelEstGroupLayout.createSequentialGroup()
.addComponent(height, GroupLayout.PREFERRED_SIZE, 84, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(width, GroupLayout.PREFERRED_SIZE, 84, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(mines, GroupLayout.PREFERRED_SIZE, 84, GroupLayout.PREFERRED_SIZE)
)
)
)
);
panelEstGroupLayout.setVerticalGroup(
panelEstGroupLayout.createParallelGroup(Alignment.LEADING)
.addGroup(panelEstGroupLayout.createSequentialGroup()
.addGap(5)
.addComponent(boxTotal, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addGroup(panelEstGroupLayout.createParallelGroup(Alignment.LEADING)
.addGroup(panelEstGroupLayout.createSequentialGroup()
.addGap(74)
.addComponent(startGame))
.addGroup(Alignment.TRAILING, panelEstGroupLayout.createSequentialGroup()
.addPreferredGap(ComponentPlacement.UNRELATED)
.addGroup(panelEstGroupLayout.createParallelGroup(Alignment.BASELINE)
.addComponent(heightLabel, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(widthLabel, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(minesLabel, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addPreferredGap(ComponentPlacement.RELATED)
.addGroup(panelEstGroupLayout.createParallelGroup(Alignment.BASELINE)
.addComponent(height)
.addComponent(width, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addComponent(mines, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(43)))
.addGap(0))
);
我将此代码插入到条件为if(custom.isSelected())
的if中,但它不起作用。为什么呢?
答案 0 :(得分:3)
您应该为单选按钮注册一个动作侦听器,当它被更改时,您可以根据单选按钮状态隐藏/取消隐藏或禁用/启用面板。
关于创建面板的时间,您可以选择立即创建面板,但在需要之前将其隐藏/禁用。或者你只能在动作进入后创建它。我个人更喜欢在开始时创建所有元素,而不是在整个代码中分发GUI元素。