提供一组值,用于描述特定 VisualElement 的目标使用模式。
None | 没有适用的特殊提示。 |
DynamicTransform | 标记经常更改其变换(即位置、旋转、缩放)的 VisualElement。 指定时,此标志会提示系统为重复出现的变换更改优化 VisualElement 的渲染。VisualElement 的顶点变换将尽可能由 GPU 在目标平台上完成。 请注意,此提示有效应用于的 VisualElements 数会受目标平台功能的限制。对于此类平台,建议仅对变换更改频率最高的 VisualElements 优先使用此提示。 |
GroupTransform | 标记一个 VisualElement,其中托管许多应用了 DynamicTransform 的子项。 此提示的一个常见用例是 VisualElement,它表示一个“viewport”,其中存在许多可以分别移动的 DynamicTransform VisualElements,此外,该“viewport”元素还经常改变其变换。但是,如果前面提及的 "viewport" 元素的内容基本为静态(非移动),那么在该元素中使用 DynamicTransform 提示已足够,而不必使用 GroupTransform。 在内部,用 GroupTransform 提示的元素将强制单独的绘制批处理使用自己的世界变换值,但同时,无论何时 GroupTransform 元素中发生变换更改,它都将避免更改其所有后代的变换。 |
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