| oldRect | 元素的旧尺寸。 |
| newRect | 元素的新尺寸。 |
GeometryChangedEvent 返回已初始化的事件。
从事件池获取一个事件并用指定的值初始化该事件。请使用此方法而不是实例化新事件。使用 Dispose() 可将事件释放回事件池。
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