动态添加组件到JDialog [英] Dynamically Add Components to a JDialog

问题描述

当用户单击JDialog上的按钮时，我无法将JComponents添加到JDialog。基本上我希望它看起来像这样：

I am having trouble adding JComponents to a JDialog when the user clicks a button on the JDialog. Basically I want it to look like this:

然后，当用户点击添加新字段时，我希望它看起来像这样：

Then, when the user clicks "Add New Field" I want it to look like this:

我似乎无法获得添加新JLabel或JTextField的对话框。任何人都可以指出我正确的方向吗？

I cannot seem to get the dialog to add the new JLabel or JTextField. Can anyone point me in the right direction?

编辑：这是添加新字段按钮的操作（只是尝试标签现在）。

EDIT: This is the action for the "Add New Field" button (Just trying a label now).

@Action
public void addNewField()
{
    Container contentPane = getContentPane();
    JLabel label = new JLabel ("welkom");
    contentPane.add(label, BorderLayout.CENTER);
}

解决方案：

我使用了mre的解决方案并让它发挥作用。这是我的最终功能：

I used mre's solution and got it to work. Here is my final function:

@Action
public void addNewField()
{
    System.out.println("New Field...");
    Container contentPane = getContentPane();
    JLabel label = new JLabel ("welcome");
    label.setBounds(10,10,100,10); //some random value that I know is in my dialog
    contentPane.add(label);

    contentPane.validate();
    contentPane.repaint();
    this.pack();
}

我的另一个问题是我使用的是免费设计布局在NetBeans中，这意味着我的标签可能处于某种奇怪的位置，而不是在我的对话框中（只是一个猜测）。我用 label.setBounds（）解决了这个问题，以便它显示我想要的确切位置。

Another one of my problems is that I am using a "Free Design" layout in NetBeans, which meant that my label was probably in some weird position rather than being in the bounds of my dialog (just a guess). I solved this problem with label.setBounds() so that it showed exactly where I wanted it to.

推荐答案

从容器中动态添加/删除组件时，需要调用 revalidate（） / validate（） 和 repaint（） 。前者将强制容器再次布局其组件，后者将删除任何视觉工件。

When dynamically adding/removing components from a container, it's necessary to invoke revalidate()/validate() and repaint() afterward. The former will force the container to layout its components again and the latter will remove any visual "artifacts".

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