Java - 替换 JFrame 中的组件 [英] Java - replace compoment in JFrame

问题描述

我正在努力使用 Java GUI - 提前感谢您的任何帮助！我有一个 JFrame，其中有几个组件:button (Jbutton) 触发动作侦听器，comp 这是我试图替换 JScrollPane 里面有一个组件(不管是什么类型的组件，可以是文本字段、表格或任何东西).

I am struggling with java GUI - thanks for any help in advance! I have a JFrame in which I have several components: button (Jbutton) that triggers action listener, comp which is a component Im trying to replace a JScrollPane with a component in it (it doesnt matter what type of component, could be text field, table or anything).

我想触发一个操作 - 删除组件，在删除组件的同一位置放置一个新组件并重新绘制窗口(我使用它来显示不同类型的文本字段和 JTables).这就是我所拥有的:

I would like to trigger an action - delete the component, place a new one on the same place as the deleted one and repaint the window (I am using this to show different types of text fields and JTables). This is what I have:

JScrollPane sp = new JScrollPane(comp);
this.add(sp, BorderLayout.CENTER);
//this works so far - first time I display this is ok!

private void replace() {
 comp = new Component(...); //name and type of the components is not important
 sp = new JSCrollPane(comp);
 this.remove(sp); //remove old component
 add(sp, BorderLayout.CENTER);
 repaint();
 revalidate();
}

为什么函数不能代替工作?它不做任何事情(它改变了逻辑中的组件，所以如果我访问 comp 的内容，它会刷新但它仍然显示旧的).

Why doesnt function replace work? It doesnt do anything (it changes the component in logic so if I access the content of comp, it is refreshed but it still shows the old one).

我写的有点象征性，因为我的代码很长...感谢您的帮助！忘记了我的代码中的一行..

I wrote it kinda symbolic, cause my code is very long... Thanks for any help! edit: forgot one line in my code..

推荐答案

您不必像之前那样尝试移除滚动窗格.

It's not necessary for you to try to remove the scroll pane as you did.

要更改滚动窗格显示的组件，只需进行以下调用:

To change the component shown by the scroll pane simply make this call:

sp.setViewportView(new Component(...));

在该调用之后，旧组件从视图中移除并替换为新组件.

after that call, the old component is removed from view and replaced by the new component.

所以你的代码应该看起来像这样:

So your code should look somewhat like this:

JScrollPane sp = new JScrollPane(comp);
this.add(sp, BorderLayout.CENTER);

private void replace() {
    comp = new Component(...); //name and type of the components is not important
    sp.setViewportView(comp);
}

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