java - 如何在 Codename One 中应用多种布局？

Question

我一直在尝试自定义代号一中的商业主题。到目前为止我已经添加了额外的按钮。现在我正在尝试让这些按钮受到 y 轴框布局的约束，但我目前收到了 IllegalArgumentException。我已将表单设置为边框布局:

Form hi = new Form("Welcome", new BorderLayout(BorderLayout.CENTER_BEHAVIOR_CENTER_ABSOLUTE));
Button Customer = new Button("Customer");
Button gpsProduct = new Button("Find A product Near You");
Button learnMore = new Button("Learn More");
Button Website = new Button("Visit Our Website");
hi.add(BoxLayout.Y_AXIS, Customer).
   add(BoxLayout.Y_AXIS, learnMore).
   add(BoxLayout.Y_AXIS, gpsProduct).
   add(BoxLayout.Y_AXIS, Website);
hi.show();

Answer 1

框布局 Y 不是边框布局的约束。目前还不清楚您希望它看起来如何，但我猜您想要这样的东西，它将一个接一个地排列组件:

Form hi = new Form("Welcome", BoxLayout.y());
Button Customer = new Button("Customer");
Button gpsProduct = new Button("Find A product Near You");
Button learnMore = new Button("Learn More");
Button Website = new Button("Visit Our Website");
hi.add(Customer).
   add(learnMore).
   add(gpsProduct).
   add(Website);
hi.show();

以下是两个将框放置在边框布局父级中的嵌套示例:

Form hi = new Form("Welcome", new BorderLayout());
Button Customer = new Button("Customer");
Button gpsProduct = new Button("Find A product Near You");
Button learnMore = new Button("Learn More");
Button Website = new Button("Visit Our Website");
Container box = new Container(BoxLayout.y());
box.add(Customer).
   add(learnMore).
   add(gpsProduct).
   add(Website);
hi.add(BorderLayout.CENTER, box);
hi.show();

这可以简写为:

Form hi = new Form("Welcome", new BorderLayout());
Button Customer = new Button("Customer");
Button gpsProduct = new Button("Find A product Near You");
Button learnMore = new Button("Learn More");
Button Website = new Button("Visit Our Website");
hi.add(BorderLayout.CENTER, 
      BoxLayout.encloseY(Customer, learnMore, gpsProduct, Website););
hi.show();