为什么 GWT 的 RichTextArea 实现 HasInitializeHandlers？
...调用 onInitialize 方法后，我可以对 RichTextArea 执行哪些以前无法执行的操作？
注意这是来自 GWT Google 小组的交叉帖子，该小组没有做出回应。
...and what can I do with my RichTextArea after the onInitialize method has been called that I cannot do before?
N.B. This is a cross-post from the GWT Google group, which produced no response.
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InitializeEvent在小部件附加到其父级后立即触发。依赖于附加到其父级的小部件的代码，因此 DOM 不应该在该点之前执行。RichTextArea小部件使用iframe，这似乎是某些功能仅在创建后才可用的原因，也取决于特定的浏览器。我没有在附加小部件后需要初始化代码的所有特定情况的完整列表。但RichTextArea小部件的一个特定示例是，如果您想将焦点设置在该小部件上，则必须附加该小部件。您可以通过扩展
RichTextArea小部件并重写onLoad方法来获得相同的行为，但这需要创建一个新类。An
InitializeEventis fired just after the widget is attached to it's parent. Code that depends on the widget being attached to it's parents and thus the DOM shouldn't be executed before that point.The
RichTextAreawidget uses aniframeand this seems to be the cause that some functionality is only available after creation, also depending on the specific browser. I have no full list of all specific cases where you need to initialize code after the widget is attached. But one example specific theRichTextAreawidget is if you want to set the focus on the widget the widget must be attached.You could get the same behavior by extending the
RichTextAreawidget and overriding theonLoadmethod, but that requires creating a new class.