JavaFX：以编程方式关闭报警框（或任何对话框）

Question

alert = new Alert(AlertType.CONFIRMATION);
alert.setTitle("Title");
alert.setHeaderText("Some Text");
alert.setContentText("Choose your option.");
buttonTypeOne = new ButtonType("Yes");
buttonTypeCancel = new ButtonType("No", ButtonData.CANCEL_CLOSE);
alert.getButtonTypes().setAll(buttonTypeOne, buttonTypeCancel);
Optional<ButtonType> result = alert.showAndWait();

编辑：包括示例代码-

>

mainapp.Java-负责处理应用程序的Java类

controller.java-相应的控制器文件

design.FXML-通过mainapp.java加载并由controller.java控制的应用程序的FXML文件

compute.java-执行计算的另一个java类。

公共类Compute{Alert Alert；

public void function1{
  Platform.runLater(new Runnable(){
      public void run(){
      alert = new Alert(AlertType.CONFIRMATION);
      alert.setTitle("Title");
      alert.setHeaderText("Some Text");
      alert.setContentText("Choose your option.");
      buttonTypeOne = new ButtonType("Yes");
      buttonTypeCancel = new ButtonType("No", ButtonData.CANCEL_CLOSE);
      alert.getButtonTypes().setAll(buttonTypeOne, buttonTypeCancel);

      Optional<ButtonType> result = alert.showAndWait();
      if (result.get() == buttonTypeOne){
      // ... user chose "One"
      } else {
      // ... user chose CANCEL or closed the dialog
      }

      }
  });
}

public void function2{
 //......Does some long computation here 
 //.... If the computation finishes before the user chooses 'Yes' or 'No' on alert box
//...Then close the alertbox here and execute the code corresponding to buttonTypeCancel


//..I tried alert.close(); and alert.hide(); but doesn't work.
}

}

还有，有没有其他的解决方案可以做到这一点呢？最初，我想让compute.java中的任何javafx代码保持干净，但不知道如何保持干净。

Answer 1

试试这个

public void function2 {
    Button cancelButton = ( Button ) alert.getDialogPane().lookupButton( buttonTypeCancel );
    cancelButton.fire();
}

或更一般的

public void function2 {
    for ( ButtonType bt : alert.getDialogPane().getButtonTypes() )
    {
        if ( bt.getButtonData() == ButtonBar.ButtonData.CANCEL_CLOSE )
        {
            Button cancelButton = ( Button ) alert.getDialogPane().lookupButton( bt );
            cancelButton.fire();
            break;
        }
    }
}

完整示例：

@Override
public void start( final Stage primaryStage )
{
    Alert alert = new Alert( Alert.AlertType.CONFIRMATION );
    alert.setTitle( "Title" );
    alert.setHeaderText( "Some Text" );
    alert.setContentText( "Choose your option." );
    ButtonType buttonTypeOne = new ButtonType( "Yes" );
    alert.initModality( Modality.NONE );
    ButtonType buttonTypeCancel = new ButtonType( "No", ButtonBar.ButtonData.CANCEL_CLOSE );
    alert.getButtonTypes().setAll( buttonTypeOne, buttonTypeCancel );

    Button b = new Button( "close alert" );
    b.setOnAction(( ActionEvent event ) ->
    {
        for ( ButtonType bt : alert.getDialogPane().getButtonTypes() )
        {
            System.out.println( "bt = " + bt );
            if ( bt.getButtonData() == ButtonBar.ButtonData.CANCEL_CLOSE )
            {
                Button cancelButton = ( Button ) alert.getDialogPane().lookupButton( bt );
                cancelButton.fire();
                break;
            }
        }
    });

    final Scene scene = new Scene( new Group( b ), 400, 300 );
    primaryStage.setScene( scene );
    primaryStage.show();

    Optional<ButtonType> result = alert.showAndWait();
    if ( result.get() == buttonTypeOne )
    {
        System.out.println( "one " );
    }
    else if( result.get() == buttonTypeCancel )
    {
        System.out.println( "cancel " );
    }
}