我想在 listView 的行上使用上下文菜单项。在 listView 的 MOUSE_CLICKED 事件的事件处理程序中,getSelectionModel().getSelectedItem() 返回选中的项目,没关系。但是,当我处理 contextMenuItem 的 onAction 事件时,它返回 null。但是,以图形方式选择了该项目。有没有办法在第一次事件处理后“保留”选择?
这是代码的相关部分:
ListView<Text> nameList = new ListView<>();
final ContextMenu cCm = new ContextMenu();
MenuItem cItem = new MenuItem("someText");
cCm.getItems().add(cItem);
...
nameList.addEventHandler(MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent e) {
if (e.getButton() == MouseButton.SECONDARY) {
//its OK here:
System.out.println(nameList.getSelectionModel().getSelectedItem().getText());
cCm.show(nameList, e.getScreenX(), e.getScreenY());
}
}
});
cItem.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent e) {
final Stage dialog = new Stage();
dialog.initModality(Modality.WINDOW_MODAL);
//nullPointerException on the following:
Text t = new Text(nameList.getSelectionModel().getSelectedItem().getText());
//showing dialog, etc.