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This scenario verifies that the cyan "container" element scrolls properly with squashing enabled. The "container" element should not squash into a composited layer mapping owned by the fixed position layer or its descendant, since this would make it behave like a fixed position element during composited scrolling.
CASE 1, original layer tree:
{
"bounds": [785, 4050],
"children": [
{
"bounds": [785, 4050],
"contentsOpaque": true,
"drawsContent": true,
"children": [
{
"bounds": [400, 200],
"contentsOpaque": true,
"drawsContent": true,
"backfaceVisibility": "hidden",
"backgroundColor": "#0000FF",
"children": [
{
"bounds": [50, 50],
"contentsOpaque": true,
"drawsContent": true,
"backfaceVisibility": "hidden",
"backgroundColor": "#FF0000"
}
]
},
{
"position": [100, 50],
"bounds": [200, 4000],
"contentsOpaque": true,
"drawsContent": true,
"backgroundColor": "#00FFFF"
}
]
}
]
}
CASE 2, scrolling y to 80, the "container" element should remain positioned with respect to the scrolled document, the fixed-pos layer compensates for the new scroll position:
{
"bounds": [785, 4050],
"children": [
{
"bounds": [785, 4050],
"contentsOpaque": true,
"drawsContent": true,
"children": [
{
"position": [0, 80],
"bounds": [400, 200],
"contentsOpaque": true,
"drawsContent": true,
"backfaceVisibility": "hidden",
"backgroundColor": "#0000FF",
"children": [
{
"bounds": [50, 50],
"contentsOpaque": true,
"drawsContent": true,
"backfaceVisibility": "hidden",
"backgroundColor": "#FF0000"
}
]
},
{
"position": [100, 50],
"bounds": [200, 4000],
"contentsOpaque": true,
"drawsContent": true,
"backgroundColor": "#00FFFF"
}
]
}
]
}
|
