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我想知道如何在堆栈中补间 sliverAppBar 和 listview 的高度,以从列表中创建单个元素的效果,从应用栏顶部开始,然后在滚动时,在其后面设置动画。它与具有附加堆栈高度属性动画的视差 srcoll 类似的效果这是该行为的示例动画