如何重新计算JComponent的首选大小? [英] How do i recalculate preferred size of a JComponent?

问题描述

我知道这样的事实，当我创建JComponent的实例时，它具有自己的首选大小.现在，让我们假设我手动设置了JComponent的PreferredSize，其尺寸为0 x0.我希望该Component重置"其自己的preferredSize.我该怎么办?

I know the fact that when I create an instance of a JComponent, it has it's own preferred size. Now let's suppose that I setPreferredSize that JComponent manually with a dimension of 0 x 0. And i want that Component to "reset" its own preferredSize. How do I do that?

推荐答案

1)将首选大小设置为null会将组件重置为重新计算其首选大小，就像从未设置过一样.

1) Setting preferred size to null should reset the component back to getting its preferred size calculated as if it was never set.

component.setPreferredSize(null);

这可能无法满足您的要求，具体取决于您发出的信号是应该重做布局的方式-但至少从技术上讲，这是对您问题的回答.

This might not do what you want, depending on how you signal that the layout should be redone - but at least it is technically the answer to your question.

2)通常建议不要使用setPreferredSize，请参见

2) It is generally advised to not use setPreferredSize, see this post

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