How to use Flutter to build a bottom sheet widget which is able to drag up to full screen?
Use the DraggableBottomSheet
widget with the Stack
widget:
Here's the gist for the entire page in this^ GIF, or try the Codepen.
Here's the structure of the entire page:
@override
Widget build(BuildContext context) {
return Scaffold(
body: Stack(
children: <Widget>[
CustomGoogleMap(),
CustomHeader(),
DraggableScrollableSheet(
initialChildSize: 0.30,
minChildSize: 0.15,
builder: (BuildContext context, ScrollController scrollController) {
return SingleChildScrollView(
controller: scrollController,
child: CustomScrollViewContent(),
);
},
),
],
),
);
}
In the Stack
:
- The Google map is the lower most layer.
- The Header (search field + horizontally scrolling chips) is above the map.
- The DraggableBottomSheet is above the Header.
Some useful parameters as defined in draggable_scrollable_sheet.dart
:
/// The initial fractional value of the parent container's height to use when
/// displaying the widget.
///
/// The default value is `0.5`.
final double initialChildSize;
/// The minimum fractional value of the parent container's height to use when
/// displaying the widget.
///
/// The default value is `0.25`.
final double minChildSize;
/// The maximum fractional value of the parent container's height to use when
/// displaying the widget.
///
/// The default value is `1.0`.
final double maxChildSize;
Neither the modal nor the persistent bottomsheets can be dragged into view. The persistent bottomsheet must be triggered open (e.g., by pressing a button) & THEN it may be dragged up & down until finally out of view. I wish there was an option to allow it to be dragged into view...
Rubber should meet your needs; I gave it a try but it always freaks out when I call setstate (so a no go for me)... Let me know if you have the same problems.