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Error message when TextSelectionOverlay finds no Overlay (#29329)

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Hans Muller 2019-03-14 09:19:47 -07:00 committed by GitHub
parent 97a8120969
commit 4e84256642
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1 changed files with 4 additions and 1 deletions
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packages/flutter/lib/src/widgets/text_selection.dart
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@ -254,7 +254,10 @@ class TextSelectionOverlay {
assert(context != null),
_value = value {
final OverlayState overlay = Overlay.of(context);
assert(overlay != null);
assert(overlay != null,
'No Overlay widget exists above $context.\n'
'Usually the Navigator created by WidgetsApp provides the overlay. Perhaps your '
'app content was created above the Navigator with the WidgetsApp builder parameter.');
_toolbarController = AnimationController(duration: fadeDuration, vsync: overlay);
}