import tripleplay.ui.Background; //导入依赖的package包/类
@Override public void wasShown () {
    // Create the root object that holds all the objects for the screen.
    super.wasShown();
    root = iface.createRoot(
            AxisLayout.vertical().gap(15),
            SimpleStyles.newSheet(),
            layer);
    root.addStyles(Style.BACKGROUND.is(
            Background.bordered(0xFFCCCCCC, 0xFF99CCFF, 5).inset(5, 10)));
    root.setSize(width(), height());

    // Create a label at the top of the screen with a title.
    root.add(new Label("Button Demo").addStyles(Style.FONT.is(TITLE_FONT)));

    // Create the button and tell it to change its name when you click it.
    final Button button = new Button("Click Me");
    root.add(button.onClick(new UnitSlot() { 
        public void onEmit () {
            button.text.update("Clicked");
        }
    }));
}
 

import tripleplay.ui.Background; //导入依赖的package包/类
@Override public void wasAdded () {
    super.wasAdded();
    int cols = Math.max(1, MathUtil.ifloor(width() / 200));
    Root root = _root.set(iface.createRoot(new TableLayout(cols).gaps(10, 10),
                                           SimpleStyles.newSheet(), layer));
    root.addStyles(Style.BACKGROUND.is(Background.solid(0xFF99CCFF).inset(10)),
                   Style.VALIGN.top);
    root.setSize(width(), height());

    Background configBG = Background.solid(0xFFCCCCCC).inset(10);
    root.add(TableLayout.colspan(new Label("PlayN Performance Tests").addStyles(
                                     Style.FONT.is(HEADER_FONT)), cols));
    root.add(BouncingQuads.config().addStyles(Style.BACKGROUND.is(configBG)));
    root.add(ScrollingQuads.config().addStyles(Style.BACKGROUND.is(configBG)));
    root.add(ParticleBurst.config().addStyles(Style.BACKGROUND.is(configBG)));
}
 

import tripleplay.ui.Background; //导入依赖的package包/类
@Override public void create (final Showcase game, Closeable.Set onClose) {
  GroupLayer layer = new GroupLayer();
  game.rootLayer.add(layer);
  onClose.add(layer);

  // create our UI manager and configure it to process pointer events
  Interface iface = new Interface(game.plat, game.paint);
  onClose.add(iface);

  // create our demo interface
  final Root root = iface.createRoot(AxisLayout.vertical().gap(15),
                                     SimpleStyles.newSheet(game.plat.graphics()));
  root.setSize(game.plat.graphics().viewSize);
  root.addStyles(Style.BACKGROUND.is(Background.solid(0xFF99CCFF).inset(5)));
  layer.add(root.layer);

  Group buttons;
  root.add(new Label("PlayN Demos:"),
           buttons = new Group(AxisLayout.vertical().offStretch()),
           new Label("ESC/BACK key or two-finger tap returns to menu from demo").addStyles(
             Style.TEXT_WRAP.is(true)),
           new Label("(renderer: " + game.plat.graphics().getClass().getSimpleName() + " " +
                     game.plat.graphics().viewSize + ")"),
           new Label("(device: " + game.deviceService.info() + ")").addStyles(
             Style.TEXT_WRAP.is(true)));

  int key = 1;
  for (final Showcase.Demo demo : game.demos) {
    Button button = new Button(key++ + " - " + demo.name);
    buttons.add(button);
    button.clicked().connect(new UnitSlot() {
      @Override public void onEmit() { game.activateDemo(demo); }
    });
  }

  // wire up keyboard shortcuts
  onClose.add(game.plat.input().keyboardEvents.connect(new Keyboard.KeySlot() {
    public void onEmit (Keyboard.KeyEvent event) {
      // this is a bit hacky, but serves our purpose
      int demoIndex = event.key.ordinal() - Key.K1.ordinal();
      if (demoIndex >= 0 && demoIndex < game.demos.size()) {
        game.activateDemo(game.demos.get(demoIndex));
      }
    }
  }));

  // resize our root if the view rotates
  onClose.add(game.rotate.connect(new UnitSlot() {
    public void onEmit () { root.setSize(game.plat.graphics().viewSize); }
  }));
}
 

import tripleplay.ui.Background; //导入依赖的package包/类
private void createUI() {
    Root root = iface.createRoot(AxisLayout.vertical(), SimGameStyle.newSheet(game().plat.graphics()), layer)
            .setSize(size());
    root.add(new Label("Loading...").addStyles(Style.COLOR.is(Palette.FOREGROUND)));
    root.addStyles(Style.BACKGROUND.is(Background.solid(Palette.BACKGROUND)));
}