CodeNameOne动态创建的表单，如何“返回" [英] CodeNameOne Dynamically created Form, how to "Back"

问题描述

在按钮的actionListener中，我们想动态创建一个Form.

In an actionListener for a button we would like to create a Form on the fly.

例如类似

Button b = new Button("Clickme");
b.setActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent evt) {
        Form f = new Form();
        Container c = new Container();
        ...
        f.addComponent(c);
        f.show();
    }
});

哪个可以正常工作.....但是后退"按钮不起作用

Which works fine..... but "back" button will not work

有人知道在actionListener中实现动态表单或通过Action Listener跳转到预定义表单的正确方法吗?

Does anyone know the correct way of implementing a dynamic form in an actionListener, or jumping to a predefined form through and action Listener?

谢谢

詹姆斯

推荐答案

您需要创建一个back命令并将其与以下形式相关联:

You need to create a back command and associate it with the form:

Command back = new Command("Back") {
     public void actionPerformed(ActionEvent ev) {
         // notice that when showing a previous form it is best to use showBack() so the 
         // transition runs in reverse
         showPreviousForm();
     }
};
f.setBackCommand(back);

您可以在完全手工编码的厨房水槽演示中看到这一点.

You can see this in the kitchen sink demo which is entirely hand coded.

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