Question

我想开发一个简单的例子，我可以选择带按钮的TreeView节点（在某些情况下点击图像等）。我创建了这个简单的示例：

package click.treenodeclicktest;

import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class MainApp extends Application
{
    @Override
    public void start(Stage stage) throws Exception
    {
        HBox hb = new HBox(initTree(), initPanel());

        Scene scene = new Scene(hb, 800, 800);

        stage.setTitle("JavaFX and Maven");
        stage.setScene(scene);
        stage.show();
    }

    public TreeView<String> initTree()
    {
        TreeItem<String> treeItemRoot = new TreeItem<>("Root");

        TreeItem<String> nodeItemA = new TreeItem<>("Item A");
        TreeItem<String> nodeItemB = new TreeItem<>("Item B");
        TreeItem<String> nodeItemC = new TreeItem<>("Item C");
        treeItemRoot.getChildren().addAll(nodeItemA, nodeItemB, nodeItemC);

        TreeItem<String> nodeItemA1 = new TreeItem<>("Item A1");
        TreeItem<String> nodeItemA2 = new TreeItem<>("Item A2");
        TreeItem<String> nodeItemA3 = new TreeItem<>("Item A3");
        nodeItemA.getChildren().addAll(nodeItemA1, nodeItemA2, nodeItemA3);

        TreeView<String> treeView = new TreeView<>(treeItemRoot);

        return treeView;
    }

    public HBox initPanel()
    {
        Button bt1 = new Button("Item A1");
        Button bt2 = new Button("Item A2");
        Button bt3 = new Button("Item A3");

        HBox hb = new HBox(bt1, bt2, bt3);
        hb.setPadding(new Insets(80, 80, 80, 80));

        return hb;
    }

    public static void main(String[] args)
    {
        launch(args);
    }

}

问题是当我点击按钮时如何选择树节点。例如，当我点击按钮Item A1时，我想选择树同上Item A1。

Answer 1

您的Button需要对treeView的引用以及对要选择的对象的引用。所以你不得不让它们可用。然后你可以打电话：

bt1.setOnAction( new EventHandler<ActionEvent>()
{
  @Override
  public void handle( final ActionEvent event )
  {
    treeView.getSelectionModel().select( nodeItemA1 );
  }
} );

<强> - 编辑 -

我接受了您的代码并对其进行了修改，以满足您的请求，但请记住，可能不希望将所有DataObjects定义为您班级中的私有成员。它只是为了说明如何选择节点：

public class MainApp extends Application
{
  private TreeView<String> treeView;

  private TreeItem<String> treeItemRoot;
  private TreeItem<String> nodeItemA;
  private TreeItem<String> nodeItemB;
  private TreeItem<String> nodeItemC;
  private TreeItem<String> nodeItemA1;
  private TreeItem<String> nodeItemA2;
  private TreeItem<String> nodeItemA3;

  @Override
  public void start( final Stage stage ) throws Exception
  {
    HBox hb = new HBox( initTree(), initPanel() );

    Scene scene = new Scene( hb, 800, 800 );

    stage.setTitle( "JavaFX and Maven" );
    stage.setScene( scene );
    stage.show();
  }

  public TreeView<String> initTree()
  {
    treeItemRoot = new TreeItem<>( "Root" );

    nodeItemA = new TreeItem<>( "Item A" );
    nodeItemB = new TreeItem<>( "Item B" );
    nodeItemC = new TreeItem<>( "Item C" );
    treeItemRoot.getChildren().addAll( nodeItemA, nodeItemB, nodeItemC );

    nodeItemA1 = new TreeItem<>( "Item A1" );
    nodeItemA2 = new TreeItem<>( "Item A2" );
    nodeItemA3 = new TreeItem<>( "Item A3" );
    nodeItemA.getChildren().addAll( nodeItemA1, nodeItemA2, nodeItemA3 );

    treeView = new TreeView<>( treeItemRoot );

    return treeView;
  }

  public HBox initPanel()
  {
    Button bt1 = new Button( "Item A1" );
    bt1.setOnAction( new EventHandler<ActionEvent>()
    {
      @Override
      public void handle( final ActionEvent event )
      {
        treeView.getSelectionModel().select( nodeItemA1 );
      }
    } );

    Button bt2 = new Button( "Item A2" );
    bt2.setOnAction( new EventHandler<ActionEvent>()
    {
      @Override
      public void handle( final ActionEvent event )
      {
        treeView.getSelectionModel().select( nodeItemA2 );
      }
    } );

    Button bt3 = new Button( "Item A3" );
    bt3.setOnAction( new EventHandler<ActionEvent>()
    {
      @Override
      public void handle( final ActionEvent event )
      {
        treeView.getSelectionModel().select( nodeItemA3 );
      }
    } );

    HBox hb = new HBox( bt1, bt2, bt3 );
    hb.setPadding( new Insets( 80, 80, 80, 80 ) );

    return hb;
  }

  public static void main( final String[] args )
  {
    launch( args );
  }
}

单击按钮选择树节点

1 个答案: