Fix update drag error that made NestedScrollView un-scrollable #127718
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Still scanning issues to see if there are other test cases here, it looks like this has been reported a lot of different ways over the years. @nt4f04uNd and @xu-baolin might like to see this, no worries if you are unavailable to check it out, but if you can I'd be interested to see what you think. :) |
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| || totalInnerExtent > (viewportDimension - maxScrollExtent) | ||
| // There is no outer extent. The inner extent was computed based on the | ||
| // full viewport dimension and is accurate for the whole NestedScrollView. | ||
| || (maxScrollExtent == 0 && totalInnerExtent > 0); |
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I think I need time to check if this change works for all the problem cases 😄
Will feedback in the next few days.
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| } | ||
| maxInnerExtent = math.max( | ||
| maxInnerExtent, | ||
| position.maxScrollExtent - position.minScrollExtent, |
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In fact, maxInnerExtent is not the total extension of the inner scrollable, but the maximum scrolling space inside, right?
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| final double maxScrollExtent = this.maxScrollExtent + overlapExtent; | ||
| final bool extentAllows = | ||
| // There is already room to scroll in the outer scroll view. | ||
| minScrollExtent != maxScrollExtent |
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This should be this.minScrollExtent != this.maxScrollExtent.
Thinking of this case, the overlapExtent > 0(just pinned the sliver bar) and the inner scrollable has a little extent that can not scrolling, we should not set this can drag, right?
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| minScrollExtent != maxScrollExtent | ||
| // The inner extent exceeds the bounds of the viewport, accounting for the | ||
| // outer extent. | ||
| || totalInnerExtent > (viewportDimension - maxScrollExtent) |
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If this is right, we just should change extentAllows to
final bool extentAllows = this.minScrollExtent != this.maxScrollExtent || totalInnerExtent > 0
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So I realized this is not accounting for the physics at all! Which reminded me of #82391... so I changed it to what i think it should really be. Even if the extent is not enough to scroll, I don't want to completely ignore AlwaysScrollableScrollPhysics, which should always scroll even if it is not long enough.
nt4f04uNd
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May 30, 2023
| // app bar should not have to consume scrolling before the inner body of the | ||
| // NestedScrollView scrolls. However, when calculating the drag here, 0 | ||
| // could result in scrolling being disabled unexpectedly if the inner scroll | ||
| // view by itself were not long enough to allow scrolling on its own. |
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Great comment!
I have to admit that this was pretty tricky for me to wrap my head around this ;-)
I am not very familiar with the internals of NestedScrollView, so I'll leave this to @xu-baolin to review
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I was actually able to make it even simpler. :)
This was referenced Jun 1, 2023
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auto label is removed for flutter/flutter, pr: 127718, due to - The status or check suite Google testing has failed. Please fix the issues identified (or deflake) before re-applying this label. |
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Roll Flutter from 0b74153 to 8a5c22e (46 revisions) flutter/flutter@0b74153...8a5c22e 2023-06-07 [email protected] Super tiny MediaQuery doc update (flutter/flutter#127904) 2023-06-07 [email protected] Revert "Make inspector weakly referencing the inspected objects." 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(plus some more docs)
Fixes #76760
Fixes #82391
Fixes #45619
Fixes #117316
Fixes #110956
Fixes #127282
Fixes #32563
Fixes #46089
Fixes #79077
Part of fixing #62833
This fixes (a bunch of) issues that have been reported differently over the years, but all have the same root cause. Sometimes the NestedScrollView would incorrectly calculate whether or not there is enough content to allow scrolling. This would only apply to drag scrolling (not mouse wheel scrolling for example). This did not relate to how the extent of the NestedScrollView is computed, but just the logic that enabled the actual drag gestures. This fixes that. :)
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