将组件动态添加到 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 JComponent 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.有人能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(现在只是尝试一个标签).

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 的解决方案并使其正常工作.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在 NetBeans 中使用了自由设计"布局，这意味着我的标签可能处于某个奇怪的位置，而不是在我的对话框的边界内(只是猜测).我用 label.setBounds() 解决了这个问题，以便它准确地显示我想要的位置.

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

在容器中动态添加/删除组件时，需要调用 revalidate()/validate() 和 repaint() 之后.前者将强制容器重新布局其组件，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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