add Sheet.addPostLayoutCallback static method #413
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Expanding [Sheet] using [SheetController] might not always work, e.g. you are trying to animate the sheet and expand controller at the same time (see: jamesblasco#412) You can use [addPostLayoutCallback] in order to defer your call to the moment [RenderSheetViewport] has finished [RenderSheetViewport.performLayout] Additionally you can provide [timeout] after which this callback should be called anyway incase [RenderSheetViewport.performLayout] doesn't start. Usually (this has not been super benchmarked!) layout starts under 50ms, putting 100ms to be on the safe side - YMMV
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What is this PR about?
Addresses issue #412, adds the
Sheet.addPostLayoutCallbackwhich allows to deferSheetControllercalls.Why do I need this?
Expanding
SheetusingSheetControllermight not always work, e.g. you are trying to animate the sheet and expand controller at the same time (see: #412). You can useaddPostLayoutCallbackin order to defer your call to the momentRenderSheetViewporthas finishedRenderSheetViewport.performLayoutAdditionally you can providetimeoutafter which this callback should be called anyway incaseRenderSheetViewport.performLayoutdoesn't start. Usually (this has not been super benchmarked!) layout starts under 50ms, putting 100ms to be on the safe side - YMMVSidenote
This is the best solution I could come up with, studying all the complexities of this package. This still doesn't fix the core issue, which is performing layout and expanding sheet at the same time - which just ends with
setPixels(0.0)(as shown in the bug report). This PR adds rather ugly static method that provides a bit more reliable workaround than use ofFuture.delay.