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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| import 'dart:math'; | ||
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| import 'package:flutter/material.dart'; | ||
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| /// | ||
| const defaultPopupWidth = 250.0; | ||
|
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| /// Renderer used to show popup window overlay | ||
| class PopupOverlayRenderer { | ||
| OverlayEntry? _overlayEntry; | ||
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| /// Max width of popup window | ||
| final double maxWidth; | ||
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| /// [PopupOverlayRenderer] constructor | ||
| PopupOverlayRenderer({this.maxWidth = defaultPopupWidth}); | ||
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| /// Render overlay entry on the screen with dismiss logic | ||
| OverlayEntry render( | ||
| BuildContext context, { | ||
| required Offset position, | ||
| required WidgetBuilder popupBuilder, | ||
| }) { | ||
| // final Offset _popupPosition = _calculatePosition(context, position); | ||
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| final _createdEntry = OverlayEntry( | ||
| builder: (context) => GestureDetector( | ||
| behavior: HitTestBehavior.opaque, | ||
| onTap: dismiss, | ||
| child: Material( | ||
| color: Colors.transparent, | ||
| child: Stack( | ||
| children: [ | ||
| Positioned( | ||
| child: CustomSingleChildLayout( | ||
| delegate: PopupOverlayLayoutDelegate(maxWidth, position), | ||
| child: popupBuilder(context), | ||
| ), | ||
| ) | ||
| ], | ||
| ), | ||
| ), | ||
| ), | ||
| ); | ||
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| Overlay.of(context).insert(_createdEntry); | ||
| _overlayEntry = _createdEntry; | ||
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| return _createdEntry; | ||
| } | ||
|
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| /// Remove popup | ||
| void dismiss() { | ||
| _overlayEntry?.remove(); | ||
| } | ||
| } | ||
|
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| /// Class that calculates where to place popup window on the screen | ||
| class PopupOverlayLayoutDelegate extends SingleChildLayoutDelegate { | ||
| /// max width of popup window | ||
| final double maxWidth; | ||
|
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| /// desired position of popup window | ||
| final Offset position; | ||
|
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| /// [PopupOverlayLayoutDelegate] constructor | ||
| const PopupOverlayLayoutDelegate(this.maxWidth, this.position); | ||
|
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| @override | ||
| Offset getPositionForChild(Size size, Size childSize) { | ||
| return _calculatePosition(size, position, childSize); | ||
| } | ||
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| Offset _calculatePosition(Size size, Offset position, Size childSize) { | ||
| final _popupRect = Rect.fromCenter( | ||
| center: position, | ||
| width: childSize.width, | ||
| height: childSize.height, | ||
| ); | ||
| const _screenBorderPadding = 10.0; | ||
| print("size: $size"); | ||
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| double dx = _popupRect.left; | ||
| // limiting X offset | ||
| dx = max(_screenBorderPadding, dx); | ||
| final rightBorderPosition = dx + childSize.width; | ||
| final rightScreenBorderOverflow = rightBorderPosition - size.width; | ||
| if (rightScreenBorderOverflow >= 0) { | ||
| dx -= rightScreenBorderOverflow + _screenBorderPadding; | ||
| } | ||
|
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| const _verticalMargin = 30.0; | ||
| // under the desired position | ||
| double dy = position.dy + _verticalMargin; | ||
| final bottomBorderPosition = dy + childSize.height; | ||
| final bottomScreenBorderOverflow = bottomBorderPosition - size.height; | ||
| // if not enough space underneath, rendering above the desired position | ||
| if (bottomScreenBorderOverflow >= 0) { | ||
| final newBottomBorderPosition = position.dy - childSize.height; | ||
| dy = newBottomBorderPosition - _verticalMargin; | ||
| } | ||
|
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| return Offset(dx, dy); | ||
| } | ||
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| @override | ||
| bool shouldRelayout(covariant PopupOverlayLayoutDelegate oldDelegate) { | ||
| return false; | ||
| } | ||
| } |