Libgdx 之CheckBox ScrollPane

CheckBox 复选框

CheckBox extends TextButton，其实CheckBox就是继承自TextButton，然后里面添加了 Image 控件，可以知道CheckBox的状态是否被选中， checkBox.isChecked()

ScrollPane 滑动列表

ScrollPane extends WidgetGroup, 默认大小是(150, 150)，大小也是由preferred size来决定的。
其实这2个控件很简单，通过源码很容易理解怎样使用

public class CheckTest extends ApplicationAdapter {    CheckBox checkBox;    ScrollPane scrollPane;    Stage stage;    Skin skin;    @Override    public void create() {        stage = new Stage();        Gdx.input.setInputProcessor(stage);        skin = new Skin(Gdx.files.internal("uiskin.json"));        checkBox = new CheckBox("CheckBox", skin);        checkBox.addListener(new ChangeListener() {            @Override            public void changed(ChangeEvent event, Actor actor) {                if (checkBox.isChecked()) {                    Gdx.app.log("TAG", "box is checked");                } else {                    Gdx.app.log("TAG", "box is unchecked");                }            }        });        final List<String> list2 = new List<String>(skin);        String[] items = {"item5", "item6", "item7", "item8"};        list2.setItems(items);        list2.pack();        scrollPane = new ScrollPane(list2, skin);        scrollPane.setHeight(scrollPane.getHeight()*0.4f);        scrollPane.setPosition(0, 40 + checkBox.getHeight());        scrollPane.addListener(new ChangeListener() {            @Override            public void changed(ChangeEvent event, Actor actor) {                // 其实是内部的Actor来处理的响应函数                System.out.println(""+list2.getSelected());            }        });        stage.addActor(checkBox);        stage.addActor(scrollPane);    }    @Override    public void render() {        Gdx.gl.glClearColor(0.39f, 0.58f, 0.92f, 1.0f);        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);        stage.act();        stage.draw();    }    @Override    public void dispose() {        stage.dispose();        skin.dispose();    }