在不使用Ctrl / Command键的情况下在JList中选择多个项目

I am looking for a way to select multiple items within a JList by just clicking each item.

我正在寻找一种方法来通过单击每个项目来选择JList中的多个项目。

The normal way to do this is to hold the command/ctrl key and then click.

执行此操作的常规方法是按住命令/ ctrl键，然后单击。

I think it would be more intuitive just to allow the user to click the items on and off without the need to hold an additional key.

我认为只需允许用户点击和关闭项目而无需持有其他密钥就更直观了。

4 个解决方案

#1

Think twice before changing default behavior. Unless you have some special use-case, I'd not like my List to work different than everywhere else :)

在更改默认行为之前请三思。除非你有一些特殊的用例，否则我不喜欢我的List工作与其他地方不同:)

Having said that, you should be able to use your own ListSelectionModel:

话虽如此，您应该能够使用自己的ListSelectionModel：

list.setSelectionModel(new DefaultListSelectionModel() {
    @Override
    public void setSelectionInterval(int index0, int index1) {
        if(super.isSelectedIndex(index0)) {
            super.removeSelectionInterval(index0, index1);
        }
        else {
            super.addSelectionInterval(index0, index1);
        }
    }
});

#2

For that you'd normally use a checkbox group of JCheckBox items.

为此，您通常使用JCheckBox项目的复选框组。

Users are already used with the fact that they need to press CTRL to select multiple items in a listbox. You should not change the default experience/expectation.

用户已经习惯使用CTRL来选择列表框中的多个项目。您不应该更改默认体验/期望。

#3

list.setSelectionModel(new DefaultListSelectionModel() {
    private int i0 = -1;
    private int i1 = -1;

    public void setSelectionInterval(int index0, int index1) {
        if(i0 == index0 && i1 == index1){
            if(getValueIsAdjusting()){
                 setValueIsAdjusting(false);
                 setSelection(index0, index1);
            }
        }else{
            i0 = index0;
            i1 = index1;
            setValueIsAdjusting(false);
            setSelection(index0, index1);
        }
    }
    private void setSelection(int index0, int index1){
        if(super.isSelectedIndex(index0)) {
            super.removeSelectionInterval(index0, index1);
        }else {
            super.addSelectionInterval(index0, index1);
        }
    }
});

#4

I think you can easily accomplish this by attaching a mouse listener on your JList and selecting programatically the item in the listener code. Of course you will probably need some code to determine which item was pressed basing on some coordinates.

我认为您可以通过在JList上附加鼠标侦听器并以编程方式选择侦听器代码中的项目来轻松实现此目的。当然，您可能需要一些代码来确定基于某些坐标按下了哪个项目。

#1