为什么在设置新的Border后我的JTextField发生了变化 [英] Why my JTextField has changed after set new Border

问题描述

我想知道为什么设置新的Border后，我的元素JTextField会改变高度:

I would like to know why my element JTextField has change height after setting a new Border:

  packagesAddField.setBorder(BorderFactory.createLineBorder(Color.RED));

在此代码之后，我的JTextField更改了高度(距上端约1px，距页脚约1px).有可能，当我设置一些边框时，他可以更改组件的外观吗?

after this code my JTextField changing a height (about 1px from upper and 1px from footer). It is possible, when i set some border he can change appearance of component?

推荐答案

总之，不要. setBorder() API建议您将边框添加到封闭容器中

In a word, don't. The setBorder() API recommends that you add the border to the enclosing container:

尽管从技术上讲，您可以在继承自JComponent的任何对象上设置边框，但是许多标准Swing组件的外观实现都无法与用户设置的边框很好地配合.通常，当您要在JPanel或JLabel以外的标准Swing组件上设置边框时，建议您将组件放在JPanel中，并在JPanel上设置边框.

Although technically you can set the border on any object that inherits from JComponent, the look and feel implementation of many standard Swing components doesn't work well with user-set borders. In general, when you want to set a border on a standard Swing component other than JPanel or JLabel, we recommend that you put the component in a JPanel and set the border on the JPanel.

或者，考虑使用 InputVerifier .

Alternatively, consider an InputVerifier.

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