如何从控制器类打开 JavaFX FileChooser？
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How do I open the JavaFX FileChooser from a controller class?
提问by Electric Coffee
My problem is that all the examples of using FileChooserrequires you to pass in a stage. Only problem is that my UI is defined in an fxmlfile, which uses a controller class separate from the main stage.
我的问题是所有使用的例子都FileChooser需要你通过一个阶段。唯一的问题是我的 UI 是在一个fxml文件中定义的，该文件使用与主阶段分开的控制器类。
@FXML protected void locateFile(ActionEvent event) {
FileChooser chooser = new FileChooser();
chooser.setTitle("Open File");
chooser.showOpenDialog(???);
}
What do I put at the ???to make it work? Like I said, I don't have any references to any stages in the controller class, so what do I do?
我在里面放了什么才能???让它工作？就像我说的，我没有对控制器类中的任何阶段进行任何引用，那我该怎么办？
采纳答案by James_D
For any node in your scene (for example, the root node; but any node you have injected with @FXMLwill do), do
对于场景中的任何节点（例如，根节点；但您注入的任何节点都@FXML可以），请执行
chooser.showOpenDialog(node.getScene().getWindow());
回答by Mansueli
You don't have to stick with the Stage created in the Application you can either:
您不必坚持使用在应用程序中创建的舞台，您可以：
@FXML protected void locateFile(ActionEvent event) {
FileChooser chooser = new FileChooser();
chooser.setTitle("Open File");
File file = chooser.showOpenDialog(new Stage());
}
Or if you want to keep using the same stage then you have to pass the stage to the controller before:
或者，如果您想继续使用同一个舞台，那么您必须先将舞台传递给控制器：
FXMLLoader loader = new FXMLLoader(getClass().getResource("yourFXMLDocument.fxml"));
Parent root = (Parent)loader.load();
MyController myController = loader.getController();
myController.setStage(stage);
and you will have the main stage of the Application there to be used as you please.
您将可以随意使用应用程序的主要阶段。
回答by spinnaker15136
From a menu item
从菜单项
public class SerialDecoderController implements Initializable {
@FXML
private MenuItem fileOpen;
@Override
public void initialize(URL url, ResourceBundle rb) {
// TODO
}
public void fileOpen (ActionEvent event) {
FileChooser fileChooser = new FileChooser();
fileChooser.setTitle("Open Resource File");
fileChooser.showOpenDialog(fileOpen.getParentPopup().getScene().getWindow());
}
回答by luke8800gts
Alternatively, what worked for me: simply put null.
或者，对我有用的是：简单地将null.
@FXML
private void onClick(ActionEvent event) {
File file = fileChooser.showOpenDialog(null);
if (file != null) {
//TODO
}
}
