MX:button - enable/disable selected (in code)

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  Hello

  Congratulations for the beautiful JavaFX, I think it will be in the future.

  How I can the devil/activate a button based on a property?

  Or this associated with a method, so more buttons in a toolbar can share the same method?

  For example, a complex application may have most of the buttons in the menu disabled if no project is open.

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  I don't know the Swing framework you use, although I did a bit of programming Swing in my day. At the time, if I remember correctly, I subclass AbstractAction and substitute their isEnabled() to manage the enabled/disabled state of button groups.

  In JavaFX, State of controls such as if they are enabled is managed by an observable property API. Have a quick look at the tutorial for that. In short, an observable property is a value that can be set and can be observed via a listener for changes in its value. The properties can be bound; binding of one property to another basically registers a listener for changes in a property that updates a second property, when these changes occur.

  Nodes have a disableProperty, which when set to true will disable this node and all nodes below the graphic scene. So if you want to disable a button under certain conditions, you can do

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  If you have a container with buttons that should all be disabled under the same conditions, you can bind the property disable of container:

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  Here is a complete example, where some of the buttons in a toolbar are activated when something is selected in a list:

  import javafx.application.Application;
  import javafx.beans.binding.Bindings;
  import javafx.beans.value.ObservableValue;
  import javafx.collections.FXCollections;
  import javafx.event.ActionEvent;
  import javafx.event.EventHandler;
  import javafx.geometry.Insets;
  import javafx.geometry.Pos;
  import javafx.scene.Scene;
  import javafx.scene.control.Button;
  import javafx.scene.control.ListView;
  import javafx.scene.control.ToolBar;
  import javafx.scene.layout.BorderPane;
  import javafx.scene.layout.HBox;
  import javafx.stage.Stage;
  
  public class DisableButtonDemo extends Application {
  
      @Override
      public void start(Stage primaryStage) {
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          final ListView list = new ListView<>(
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          final Button clearSelectionButton = new Button("Clear selection");
          clearSelectionButton.setOnAction(new EventHandler() {
              @Override
              public void handle(ActionEvent event) {
                  list.getSelectionModel().clearSelection();
              }
          });
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          Button editButton = new Button("Edit");
          Button deleteButton = new Button("Delete");
  //
          // Bind disable property of buttons:
          ObservableValue emptySelection = Bindings.isEmpty(list.getSelectionModel().getSelectedItems());
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  //
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          HBox clearSelectionButtonContainer = new HBox();
          clearSelectionButtonContainer.setAlignment(Pos.CENTER);
          clearSelectionButtonContainer.getChildren().add(clearSelectionButton);
  //
          final Insets padding = new Insets(10);
          clearSelectionButtonContainer.setPadding(padding);
  //
          BorderPane root = new BorderPane();
          root.setPadding(padding);
          root.setTop(toolbar);
          root.setCenter(list);
          root.setBottom(clearSelectionButtonContainer);
  //
          Scene scene = new Scene(root, 600, 600);
          primaryStage.setScene(scene);
          primaryStage.show();
      }
  //
      public static void main(String[] args) {
          launch(args);
      }
  }
  

  Notice how I used the class Bindings to create value to bind the disable property. The class of links has a ton of useful methods to create links.

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