DocumentFilter:为什么调用 replace() 而不是 insertString()? [英] DocumentFilter: Why is replace() invoked and not insertString()?

问题描述

我已经实现了一个 DocumentFilter 子类，当我在 JTextComponent 中输入文本时，过滤器的 replace() 方法是被调用，而不是 insertString()(从未被调用).知道这是为什么吗?

I've implemented a DocumentFilter subclass, and when I type text into the JTextComponent, the replace() method of the filter is invoked, and not insertString() (which is never invoked). Any idea why that is?

推荐答案

insertString(...) 方法在您使用 Document.insertString(...) 方法.

The insertString(...) method is invoked when you update the Document directly, by using the Document.insertString(...) method.

replace(...) 方法在用户输入文本或用户调用操作(剪切、粘贴) 与文本字段关联.

The replace(...) method is invoked when the Document is updated by methods of the View (ie. the JTextField) when the user enters text or the user invokes Actions (cut, paste) associated with the text field.

我想总是替换更容易，然后让替换逻辑检查是否需要删除/插入.

I guess its is easier to always to a replace and then let the replace logic check to see if remove/insert is required.

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