（翻译）第二十六回 JavaFX2.0 标题窗格TitledPane和手风琴控件Accordion

原文地址http://download.oracle.com/javafx/2.0/ui_controls/accordion-titledpane.htm#CACGBAHI

 

 

 

标题窗格就是带有标题的面板，可以被打开和关闭，也可以被包进任何Node元素，诸如UI控件、图片、计入布局容器的元素组。

标题窗格可以用手风琴控件来形成组。手风琴控件能创建多个窗格而每次只显示一个。Figure 20-1 是带有3个标题窗格的手风琴控件。

 

Figure 20-1 Accordion with Three Titled Panes

Description of "Figure 20-1 Accordion with Three Titled Panes"

 

JavaFX SDK API中的 Accordion 和 TitledPane 类用来实现这样的控件。

创建Titled Panes

创建TitledPane 控件要定义一个标题和一些内容。可以使用TitledPane 类的带有两个参数的构造方法，或者单独使用setText 和setContent 方法也行。两种方法都在Example 20-1 中 .

Example 20-1 Declaring a TitledPane Object

//using a two-parameter constructor
TitledPane tp = new TitledPane("My Titled Pane", new Button("Button"));
//applying methods
TitledPane tp = new TitledPane();
tp.setText("My Titled Pane");
tp.setContent(new Button("Button"));

它们的效果系统，都是 Figure 20-2 .

Figure 20-2 Titled Pane with a Button

Description of "Figure 20-2 Titled Pane with a Button"

 

标题窗格可以改变大小来适应它的内容。可以添加多行文本，结果见Figure 20-3 .

Figure 20-3 Titled Pane with Some Text

Description of "Figure 20-3 Titled Pane with Some Text"

不要明确指定标题窗格的最小、最大和优先的高度值，这样在打开关闭时可能导致难以预料的行为。

 Example 20-2 在的代码添加了几个控件到标题窗格，然后加入到了GridPane 布局容器。

 

Example 20-2 Titled Pane with the GridPane Layout Container

TitledPane gridTitlePane = new TitledPane();


GridPane grid = new GridPane();
grid.setVgap(4);
grid.setPadding(new Insets(5, 5, 5, 5));
grid.add(new Label("First Name: "), 0, 0);
grid.add(new TextField(), 1, 0);
grid.add(new Label("Last Name: "), 0, 1);
grid.add(new TextField(), 1, 1);
grid.add(new Label("Email: "), 0, 2);
grid.add(new TextField(), 1, 2);        
gridTitlePane.setText("Grid");


gridTitlePane.setContent(grid);

 

运行的结果是 Figure 20-4 。

Figure 20-4 Titled Pane that Contains Several Controls

Description of "Figure 20-4 Titled Pane that Contains Several Controls"

可以定义标题窗格打开关闭的方式。默认地，标题窗格是可伸缩的，它们的移动也是动画。如果要阻止标题窗格关闭，将setCollapsible方法 设为false。 也可以将 setAnimated 方法设为false来关闭动画打开效果。 Example 20-3 中的代码实现了该任务。

 

Example 20-3 Adjusting the Style of a Titled Pane

TitledPane tp = new TitledPane();
//prohibit closing
tp.setCollapsible(false);
//prohibit animating
tp.setAnimated(false);

 

将Titled Panes加入到Accordion

在应用中，可以单独使用标题窗格，也可以使用Accordion 把控件编组。同样也不要指定手风琴控件的高度值。

将几个标题窗格加入到手风琴很类似把开关按钮加入到开关组：每次只能打开手风琴中的一个标题窗格。Example 20-4 创建了3个标题窗格并加入到了手风琴中。

 

Example 20-4 Accordion and Three Titled Panes

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Accordion;
import javafx.scene.control.TitledPane;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
 
public class TitledPaneSample extends Application {
    final String[] imageNames = new String[]{"Apples", "Flowers", "Leaves"};
    final Image[] images = new Image[imageNames.length];
    final ImageView[] pics = new ImageView[imageNames.length];
    final TitledPane[] tps = new TitledPane[imageNames.length];
           
    public static void main(String[] args) {
        launch(args);
    }
 
    @Override public void start(Stage stage) {
        stage.setTitle("TitledPane");
        Scene scene = new Scene(new Group(), 80, 180);
        scene.setFill(Color.GHOSTWHITE);
                               
        final Accordion accordion = new Accordion ();

   
        
        for (int i = 0; i < imageNames.length; i++) {

          
            images[i] = new 

                Image(getClass().getResourceAsStream(imageNames[i] + ".jpg"));

            pics[i] = new ImageView(images[i]);

            tps[i] = new TitledPane(imageNames[i],pics[i]);

        }   
        accordion.getPanes().addAll(tps);

        accordion.setExpandedPane(tps[0]);

        Group root = (Group)scene.getRoot();
        root.getChildren().add(accordion);
        stage.setScene(scene);
        stage.show();
    }
}

 

用循环创建了3个标题窗格，每个的内容都是ImageView 对象。把标题窗格加入到手风琴中要使用getPanes 和addAll 方法。可以用add 方法代替addAll 方法来加入单个标题窗格。

默认地，应用启动后所有窗格都关着。setExpandedPane方法指定了带有苹果图片的窗格要打开。见 Figure 20-5 .

Figure 20-5 Accordion with Three Titled Panes

Description of "Figure 20-5 Accordion with Three Titled Panes"

处理Accordion事件

可以使用标题窗格和手风琴程序不同的数据。Example 20-5 创建了一个单独的标题窗格放进GridPane 悲剧容器和三个标题窗格放进手风琴中。单独的窗格包含了一个email客户端元素，手风琴使得选择窗格会显示相应的图片。

 

Example 20-5 Implementing ChangeListener for an Accordion

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.geometry.Insets;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Accordion;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.control.TitledPane;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
 
public class TitledPaneSample extends Application {
    final String[] imageNames = new String[]{"Apples", "Flowers", "Leaves"};
    final Image[] images = new Image[imageNames.length];
    final ImageView[] pics = new ImageView[imageNames.length];
    final TitledPane[] tps = new TitledPane[imageNames.length];
    final Label label = new Label("N/A");
       
    public static void main(String[] args) {
        launch(args);
    }
 
    @Override public void start(Stage stage) {
        stage.setTitle("TitledPane");
        Scene scene = new Scene(new Group(), 800, 250);
        scene.setFill(Color.GHOSTWHITE);
        
        // --- GridPane container
        TitledPane gridTitlePane = new TitledPane();
        GridPane grid = new GridPane();
        grid.setVgap(4);
        grid.setPadding(new Insets(5, 5, 5, 5));
        grid.add(new Label("To: "), 0, 0);
        grid.add(new TextField(), 1, 0);
        grid.add(new Label("Cc: "), 0, 1);
        grid.add(new TextField(), 1, 1);
        grid.add(new Label("Subject: "), 0, 2);
        grid.add(new TextField(), 1, 2);        
        grid.add(new Label("Attachment: "), 0, 3);
        grid.add(label,1, 3);
        gridTitlePane.setText("Grid");
        gridTitlePane.setContent(grid);
        
        // --- Accordion
        final Accordion accordion = new Accordion ();                
        for (int i = 0; i < imageNames.length; i++) {
            images[i] = new 
                Image(getClass().getResourceAsStream(imageNames[i] + ".jpg"));
            pics[i] = new ImageView(images[i]);
            tps[i] = new TitledPane(imageNames[i],pics[i]); 
        }   
        accordion.getPanes().addAll(tps);        
        accordion.expandedPaneProperty().addListener(new

            ChangeListener<TitledPane>() {

                public void changed(ObservableValue<? extends TitledPane> ov,

                    TitledPane old_val, TitledPane new_val) {

                        if (new_val != null) {

                            label.setText(accordion.getExpandedPane().getText() + 

                                ".jpg");

                        }

             }

        });

        
        HBox hbox = new HBox(10);
        hbox.setPadding(new Insets(20, 0, 0, 20));
        hbox.getChildren().setAll(gridTitlePane, accordion);
 
        Group root = (Group)scene.getRoot();
        root.getChildren().add(hbox);
        stage.setScene(scene);
        stage.show();
    }
}

 

当打开手风琴中的标题窗格时，手风琴的 expandedPaneProperty 属性就会改变。ChangeListener对象通报了该变化，而手风琴中打开的标题窗格就构建一个文件名，该文件名就作为相应 Label对象的文本。

Figure 20-6 是应用启动后的样子，Attachment标签是"N/A,"因为没有窗格被选中。

 

Figure 20-6 Initial View of the TitledPaneSample Application

Description of "Figure 20-6 Initial View of the TitledPaneSample Application"

 

如果打开的是Leaves标题窗格，Attachment标签就变成"Leaves.jpg,"见Figure 20-7 .

Figure 20-7 TitledPaneSample Application with the Leaves Titled Pane Expanded

Description of "Figure 20-7 TitledPaneSample Application with the Leaves Titled Pane Expanded"

TitledPane 和Accordion 类都继承了Node类，所以可以应用特效和使用CSS。