我想将KeyStrokes添加到CheckBoxes组中,因此当用户点击1时,键击将选择/取消选择第一个JCheckBox。
我已经制作了这部分代码,但它没有用,有人能指出我正确的方向吗?
for (int i=1;i<11;i++)
{
boxy[i]=new JCheckBox();
boxy[i].getInputMap().put(KeyStroke.getKeyStroke((char) i),("key_"+i));
boxy[i].getActionMap().put(("key_"+i), new AbstractAction() {
public void actionPerformed(ActionEvent e) {
JCheckBox checkBox = (JCheckBox)e.getSource();
checkBox.setSelected(!checkBox.isSelected());
}});
pnlOdpovede.add(boxy[i]);
}
答案 0 :(得分:2)
问题是您使用类型为WHEN_FOCUSED的checkBox注册了绑定:它们仅对keyPressed时关注的特定复选框有效。
假设您想要独立于focusOwner切换选定状态,另一种方法是将keyBindings注册到checkBoxes的父容器,并添加一些逻辑来查找要切换其选择状态的组件:
// a custom action doing the toggle
public static class ToggleSelection extends AbstractAction {
public ToggleSelection(String id) {
putValue(ACTION_COMMAND_KEY, id);
}
@Override
public void actionPerformed(ActionEvent e) {
Container parent = (Container) e.getSource();
AbstractButton child = findButton(parent);
if (child != null) {
child.setSelected(!child.isSelected());
}
}
private AbstractButton findButton(Container parent) {
String childId = (String) getValue(ACTION_COMMAND_KEY);
for (int i = 0; i < parent.getComponentCount(); i++) {
Component child = parent.getComponent(i);
if (child instanceof AbstractButton && childId.equals(child.getName())) {
return (AbstractButton) child;
}
}
return null;
}
}
// register with the checkbox' parent
for (int i=1;i<11;i++) {
String id = "key_" + i;
boxy[i]=new JCheckBox();
boxy[i].setName(id);
pnlOdpovede.getInputMap(WHEN_ANCESTOR_OF_FOCUSED_COMPONENT)
.put(KeyStroke.getKeyStroke((char) i), id);
pnlOdpovede.getActionMap().put(id, new ToggleSelection(id));
pnlOdpovede.add(boxy[i]);
}
BTW:假设你的checkBoxes有Actions(它们应该:-),ToggleAction可以触发那些Actions而不是手动切换选择。这approach is used in a recent thread