防止 JavaFX 中的手风琴折叠 [英] Prevent an accordion in JavaFX from collapsing

问题描述

是否有一种简单的方法可以防止 JavaFX 2.1 中的手风琴完全折叠?我有一个带有几个条目的手风琴，但如果用户单击活动的手风琴条目，它会折叠手风琴.

Is there an easy way of preventing an accordion in JavaFX 2.1 from fully collapsing? I have an accordion with a few entries but if the user clicks the active accordion entry it collapses the accordion.

我可能可以使用鼠标点击侦听器来检查检查并采取相应的行动，但这感觉应该比完成更简单.

I could probably use a mouse click listener to check do the check and act accordingly but this feels like it should be even simpler than that to accomplish.

推荐答案

为当前展开的手风琴窗格添加一个监听器，并通过修改它的可折叠属性来防止它被用户折叠.

Add a listener to the currently expanded accordion pane and prevent it from being collapsed by the user by modifying it's collapsible property.

这是一个示例应用:

import javafx.application.Application;
import javafx.application.Platform;
import javafx.beans.value.*;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.Stage;

public class AccordionSample extends Application {
  public static void main(String[] args) { launch(args); }
  @Override public void start(Stage primaryStage) {
    // create some titled panes to go in an accordion.
    TitledPane adminPane = new TitledPane("Animals", 
      VBoxBuilder.create().style("-fx-padding: 10").spacing(10).children(
        ButtonBuilder.create().text("Zebra").maxWidth(Double.MAX_VALUE).build(),
        ButtonBuilder.create().text("Shrew").maxWidth(Double.MAX_VALUE).build()
      ).build()            
    );
    TitledPane viewPane = new TitledPane("Vegetables", 
      VBoxBuilder.create().style("-fx-padding: 10").spacing(10).children(
        ButtonBuilder.create().text("Eggplant").maxWidth(Double.MAX_VALUE).build(),
        ButtonBuilder.create().text("Carrot").maxWidth(Double.MAX_VALUE).build()
      ).build()            
    );

    // create an accordion, ensuring the currently expanded pane can not be clicked on to collapse.
    Accordion accordion = new Accordion();
    accordion.getPanes().addAll(adminPane, viewPane);
    accordion.expandedPaneProperty().addListener(new ChangeListener<TitledPane>() {
      @Override public void changed(ObservableValue<? extends TitledPane> property, final TitledPane oldPane, final TitledPane newPane) {
        if (oldPane != null) oldPane.setCollapsible(true);
        if (newPane != null) Platform.runLater(new Runnable() { @Override public void run() { 
          newPane.setCollapsible(false); 
        }});
      }
    });
    for (TitledPane pane: accordion.getPanes()) pane.setAnimated(false);
    accordion.setExpandedPane(accordion.getPanes().get(0));

    // layout the scene.
    StackPane layout = new StackPane();
    layout.setStyle("-fx-padding: 10; -fx-background-color: cornsilk;");
    layout.getChildren().add(accordion);
    primaryStage.setScene(new Scene(layout));
    primaryStage.show();
  }
}

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