[英]Can't see components in JScrollPane
I'm using a JScrollPane to hold a JTextArea for a large area of text. 我正在使用JScrollPane来保存一个大文本区域的JTextArea。 I add the TextArea directly to the JFrame, it works fine. 我直接将TextArea添加到JFrame,它工作正常。 But I add it to the scrollpane and add the scrollpane, I don't see the textarea. 但是我将其添加到滚动窗格并添加滚动窗格,但看不到文本区域。 Here's my SSCCE: 这是我的SSCCE:
public class foo extends JFrame{
//gui elements
JTextArea chatMonitor = new JTextArea();
JScrollPane textPane = new JScrollPane();
ChatFrame(final String nickname, final String login, final String server, final String channel){
setSize(500,500);
chatMonitor.setEditable(false);
chatMonitor.setVisible(true);
textPane.add(chatMonitor);
textPane.setAutoscrolls(true);
textPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
textPane.setVisible(true);
add(textPane);
}
}
Assuming textPane
is a JScrollPane
, you should never be adding components to it. 假设textPane
是JScrollPane
,则永远不要向其添加组件。
Instead use JScrollPane#setViewportView(Component)
而是使用JScrollPane#setViewportView(Component)
JScrollPane
is made of a number components which work together to provide you the functionality required to make the component scrollable... JScrollPane
由许多组件组成,这些组件可以共同为您提供使组件可滚动所需的功能...
JScrollPane
has a JViewport
, which is used to contain the component you want to be scrolled. JScrollPane
有一个JViewport
,它用于包含要滚动的组件。 You need to "apply" the component to the view. 您需要将组件“应用”到视图。
Take a closer look at How to use Scroll Panes for more details 详细了解如何使用滚动窗格
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