The vertex positions are transformed from clip-space to window space via the Perspective Divide and the Viewport Transform.

经过视角除法和视口变换两步，顶点的位置就从裁剪空间变换到了窗口空间。

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You don't want ThickBox to cover the entire window, let alone extend beyond the edges of the viewport.

您不想让ThickBox覆盖整个窗口，更不想让它延伸到视区以外。

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For example, when a top-level window is moved completely off-screen or a child object is moved outside the boundaries of the container's viewport.

例如，在顶级窗口完全移动到屏幕之外或者某个子对象移动到容器视区边界外部的时候。

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For example, when a top-level window is moved completely off-screen or a child object is moved outside the boundaries of the container's viewport.

例如，在顶级窗口完全移动到屏幕之外或者某个子对象移动到容器视区边界外部的时候。

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