Swing双击

Question

当尝试通过双击从列表中选择项目时，它为两个列表都选择了一次，但在通过单击选择之后！

    listScrollPanel.setViewportView(categoryList);
    subCategoryList.setModel(new javax.swing.AbstractListModel() {
        String[] strings = {"Sub-category 1", "Sub-category 2", "Sub-category 3", "Sub-category 4", "Sub-category 5", "Sub-category 6"};
    });
subCategoryList.addMouseListener(new java.awt.event.MouseAdapter() {
    @Override
    public void mouseClicked(java.awt.event.MouseEvent evt) {
        infoBox(Integer.toString(evt.getClickCount()), subCategory);
        if (evt.getClickCount() == 2) {
            subCategoryList.addListSelectionListener(new javax.swing.event.ListSelectionListener() {
                @Override
                public void valueChanged(javax.swing.event.ListSelectionEvent evt) {
                    subCategoryListValueChanged(evt);
                }
            });
        }
    }
});
private void subCategoryListValueChanged(javax.swing.event.ListSelectionEvent evt) {

    subCategory = (String) subCategoryList.getSelectedValue();
    labelSC.setText(CAT_HEADER);
    listScrollPanel.setViewportView(categoryList);
}
private static void infoBox(String Message, String location) {
    JOptionPane.showMessageDialog(null, Message, location, JOptionPane.INFORMATION_MESSAGE);
}

如何让他只听双击？我有双击后的categoryList和ListSelection更改viewportView为subCategory，这是一样的工作！但他们在前2次双击后就反应了单击！

Answer 1

每次发生双击事件时，都会添加一个新的ListSelectionListener。它们中的每一个都会对单击鼠标做出响应。您可以单独使用MouseListener：

subCategoryList.addMouseListener(new MouseAdapter() {
    @Override
    public void mouseClicked(MouseEvent evt) {
        if (evt.getClickCount() == 2) {
           String selectedValue = subCategoryList.getSelectedValue();
           // do stuff with selectedValue...
        }
    }
});