* Reland "Nnbd widgets (#64672)"
This reverts commit 127e67902e8bbb0dcbfb3351b8fd00f7cbdf0178.
* remove non-nullable enforcement on AsyncSnapshot
* make data param non-nullable for AsyncSnapshot.withData
* make some Text params non-nullable
* migrate widget to nullsafety
* remove double blank line after license
* address review comments in actions.dart
* nullable ObjectKey.value
* use local variable oldElement
* make State.build non-nullable
* make State.context non-nullable
* newline at eof
* make ProxyWidget.child non-nullable
* make _InactiveElements.debugContains non-nullable
* make Element.depth non-nullable
* make ProxyElement.build non-nullable
* make StatefulElement.state non-nullable
* remove 'Notice that'
* avoid cast of list in RenderObjectElement.updateChildren
* make IndexedSlot.value non-nullable
* avoid cast of list in MultiChildRenderObjectElement.mount
* make some WidgetsApp parameters non-nullable
* hitTest take non-nullable position
* make ScrollableState.position non-nullable
* use _pixels instead of pixels
* make ViewportOffset.pixels non-nullable
* make param and return type of IndexedWidgetBuilder non-nullable
* unused_import
* make context param non-nullable for Builder in animated_list.dart
* make ScrollMetrics.viewportDimension non-nullable
* make ScrollMetrics.{min,max}ScrollExtent non-nullable
* make _Location.file non-nullable
* _WidgetForTypeTests.createElement throw UnimplementedError
* update _NullWidget.build error message
* make _ShortcutsState.manager non-nullable
* Fix childCount issues for NNBD
* fix childCount computation on web
* increase max value on js side to compute childCount
* make aspect parameter of dependOnInheritedWidgetOfExactType nullable
* merge has{min,max}ScrollExtent into hasScrollExtents
* update focus_manager.dart
* address review comments in icon.dart
* address review comments in image.dart
* address review comments in routes.dart
* address review comments in scroll_activity.dart
* update doc comments
* make UserScrollNotification.direction non-nullable and required
* rename hasScrollExtents to hasContentDimensions
* unnecessary late
Co-authored-by: Ian Hickson <ian@hixie.ch>
* Update project.pbxproj files to say Flutter rather than Chromium
Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright.
* Update the copyright notice checker to require a standard notice on all files
* Update copyrights on Dart files. (This was a mechanical commit.)
* Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine.
Some were already marked "The Flutter Authors", not clear why. Their
dates have been normalized. Some were missing the blank line after the
license. Some were randomly different in trivial ways for no apparent
reason (e.g. missing the trailing period).
* Clean up the copyrights in non-Dart files. (Manual edits.)
Also, make sure templates don't have copyrights.
* Fix some more ORGANIZATIONNAMEs
* Upgrade everything except matcher.
* Roll matcher (and test)
* Adjust tests that depend on flutter:test directly to depend on a shim
* Require use of package:test shim and remove other references to package:test
* Manually fix every use of Point.x and Point.y
Some of these were moved to dx/dy, but not all.
* Manually convert uses of the old gradient API
* Remove old reference to Point.
* Mechanical changes
I applied the following at the root of the Flutter repository:
git ls-files -z | xargs -0 sed -i 's/\bPoint[.]origin\b/Offset.zero/g'
git ls-files -z | xargs -0 sed -i 's/\bPoint[.]lerp\b/Offset.lerp/g'
git ls-files -z | xargs -0 sed -i 's/\bnew Point\b/new Offset/g'
git ls-files -z | xargs -0 sed -i 's/\bconst Point\b/const Offset/g'
git ls-files -z | xargs -0 sed -i 's/\bstatic Point /static Offset /g'
git ls-files -z | xargs -0 sed -i 's/\bfinal Point /final Offset /g'
git ls-files -z | xargs -0 sed -i 's/^\( *\)Point /\1Offset /g'
git ls-files -z | xargs -0 sed -i 's/ui[.]Point\b/ui.Offset/g'
git ls-files -z | xargs -0 sed -i 's/(Point\b/(Offset/g'
git ls-files -z | xargs -0 sed -i 's/\([[{,]\) Point\b/\1 Offset/g'
git ls-files -z | xargs -0 sed -i 's/@required Point\b/@required Offset/g'
git ls-files -z | xargs -0 sed -i 's/<Point>/<Offset>/g'
git ls-files -z | xargs -0 sed -i 's/[.]toOffset()//g'
git ls-files -z | xargs -0 sed -i 's/[.]toPoint()//g'
git ls-files -z | xargs -0 sed -i 's/\bshow Point, /show /g'
git ls-files -z | xargs -0 sed -i 's/\bshow Point;/show Offset;/g'
* Mechanical changes - dartdocs
I applied the following at the root of the Flutter repository:
git ls-files -z | xargs -0 sed -i 's/\ba \[Point\]/an [Offset]/g'
git ls-files -z | xargs -0 sed -i 's/\[Point\]/[Offset]/g'
* Further improvements and a test
* Fix minor errors from rebasing...
* Roll engine
This patch adds grid supports to slivers and introduces a ScrollGrid
convenience class for making the common types of scrollable grids.
This patch also deploys ScrollGrid in an example in the Flutter Gallery.
Add SliverList
A SliverList is a linear layout of box children in a viewport that all
have a common, fixed extent along the scroll axis. The layout is similar
to a SliverBlock but more efficient.
