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Merge pull request #470 from digitalfabrik/419-fix-map-orientation
Reenable rotation to and from landscape mode on Android
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| import 'dart:math'; | ||
| import 'package:flutter/material.dart'; | ||
|
|
||
| /// A widget which resizes the child widget twice when the orientation changes. | ||
| /// | ||
| /// * Firstly, the child put in a container with the following constraints: | ||
| /// `width = height = max(parentMaxWidth, parentMaxHeight)`. This creates a square. | ||
| /// * Secondly, the child is resized to | ||
| /// `width = parentMaxWidth, height = parentMaxHeight. This sizes the child according to the parent constraints. This | ||
| /// resize only happens if the child is already initialized. If it is not yet initialized then the resize is delayed. | ||
| class ScreenParentResizer extends StatelessWidget { | ||
| final Widget child; | ||
| final bool childInitialized; | ||
|
|
||
| const ScreenParentResizer({ | ||
| Key? key, | ||
| required this.child, | ||
| required this.childInitialized, | ||
| }) : super(key: key); | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| return LayoutBuilder( | ||
| builder: (BuildContext context, BoxConstraints constraints) { | ||
| return _InnerScreenParentResizer( | ||
| childInitialized: childInitialized, | ||
| constraints: constraints, | ||
| child: child, | ||
| ); | ||
| }, | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| class _InnerScreenParentResizer extends StatefulWidget { | ||
| final Widget? child; | ||
| final bool childInitialized; | ||
| final BoxConstraints constraints; | ||
|
|
||
| const _InnerScreenParentResizer({ | ||
| Key? key, | ||
| required Widget this.child, | ||
| required this.childInitialized, | ||
| required this.constraints, | ||
| }) : super(key: key); | ||
|
|
||
| @override | ||
| State createState() => _InnerScreenParentResizerState(); | ||
| } | ||
|
|
||
| class _InnerScreenParentResizerState extends State<_InnerScreenParentResizer> { | ||
| Orientation? _lastBuildOrientation; | ||
| Orientation? _initialOrientationUpdate; | ||
|
|
||
| @override | ||
| void didChangeDependencies() { | ||
| super.didChangeDependencies(); | ||
|
|
||
| // As soon as the child is initialized we trigger the orientation update | ||
| if (widget.childInitialized) { | ||
| setState(() { | ||
| _lastBuildOrientation = _initialOrientationUpdate; | ||
| }); | ||
| } | ||
| } | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| final maximum = max( | ||
| widget.constraints.maxWidth, | ||
| widget.constraints.maxHeight, | ||
| ); | ||
|
|
||
| final currentOrientation = MediaQuery.of(context).orientation; | ||
| final isOverDrawingSquare = currentOrientation != _lastBuildOrientation; | ||
|
|
||
| if (isOverDrawingSquare) { | ||
| // We only trigger a resize if the child component finished initializing | ||
| if (widget.childInitialized) { | ||
| setState(() { | ||
| _lastBuildOrientation = currentOrientation; | ||
| }); | ||
| } else { | ||
| _initialOrientationUpdate = currentOrientation; | ||
| } | ||
| } | ||
|
|
||
| final width = isOverDrawingSquare ? maximum : null; | ||
| final height = isOverDrawingSquare ? maximum : null; | ||
|
|
||
| return OverflowBox( | ||
| alignment: Alignment.topLeft, | ||
| maxHeight: height, | ||
| maxWidth: width, | ||
| child: widget.child, | ||
| ); | ||
| } | ||
| } |