如果点击JList上的选定索引,我希望它取消选择.换句话说,点击索引实际上会切换他们的选择.看起来不像这样被支持,所以我试过
list.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent evt)
{
java.awt.Point point = evt.getPoint();
int index = list.locationToIndex(point);
if (list.isSelectedIndex(index))
list.removeSelectionInterval(index,index);
}
});
这里的问题是在JList已经对鼠标事件进行操作后被调用,所以它会取消选择所有内容.所以我试图删除所有的JList的MouseListener,添加自己的,然后添加所有的默认监听器.这没有工作,因为JList将在我取消选择之后重新选择索引.无论如何,我最终想到的是
MouseListener[] mls = list.getMouseListeners();
for (MouseListener ml : mls)
list.removeMouseListener(ml);
list.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent evt)
{
java.awt.Point point = evt.getPoint();
final int index = list.locationToIndex(point);
if (list.isSelectedIndex(index))
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
list.removeSelectionInterval(index,index);
}
});
}
});
for (MouseListener ml : mls)
list.addMouseListener(ml);
…和那个工作.但我不喜欢有没有更好的办法？
解决方法
看一下示例“ListSelectionModel：启用切换选择模式”：
http://java.sun.com/products/jfc/tsc/tech_topics/jlist_1/jlist.html
http://java.sun.com/products/jfc/tsc/tech_topics/jlist_1/jlist.html
我已经对多选列表框进行了修改(将setSelectionInterval更改为addSelectionInterval),如果您在鼠标停止时单击以取消选择并移动鼠标,则可以消除重新选择的问题(移动手势启动检查以进行添加和去掉).
objList.setSelectionModel(new DefaultListSelectionModel() {
private static final long serialVersionUID = 1L;
boolean gestureStarted = false;
@Override
public void setSelectionInterval(int index0,int index1) {
if(!gestureStarted){
if (isSelectedIndex(index0)) {
super.removeSelectionInterval(index0,index1);
} else {
super.addSelectionInterval(index0,index1);
}
}
gestureStarted = true;
}
@Override
public void setValueIsAdjusting(boolean isAdjusting) {
if (isAdjusting == false) {
gestureStarted = false;
}
}
});
