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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| /* | ||
| * This file is part of BoxBox (https://github.com/BrightDV/BoxBox). | ||
| * | ||
| * BoxBox is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Lesser General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * BoxBox is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Lesser General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Lesser General Public License | ||
| * along with BoxBox. If not, see <http://www.gnu.org/licenses/>. | ||
| * | ||
| * Copyright (c) 2022-2023, BrightDV | ||
| */ | ||
|
|
||
| import 'package:flutter/material.dart'; | ||
|
|
||
| // Originally form https://github.com/Sangwan5688/BlackHole/blob/main/lib/CustomWidgets/custom_physics.dart | ||
|
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| class PagingScrollPhysics extends ScrollPhysics { | ||
| final double itemDimension; | ||
|
|
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| const PagingScrollPhysics({required this.itemDimension, super.parent}); | ||
|
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| @override | ||
| PagingScrollPhysics applyTo(ScrollPhysics? ancestor) { | ||
| return PagingScrollPhysics( | ||
| itemDimension: itemDimension, | ||
| parent: buildParent(ancestor), | ||
| ); | ||
| } | ||
|
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||
| Tolerance toleranceFor(ScrollMetrics metrics) { | ||
| double devicePixelRatio = | ||
| MediaQueryData.fromWindow(WidgetsBinding.instance.window) | ||
| .devicePixelRatio / | ||
| WidgetsBinding.instance.window.physicalSize.height; | ||
| return Tolerance( | ||
| velocity: 1.0 / (50 * devicePixelRatio), // logical pixels per second | ||
| distance: 1.0 / devicePixelRatio, // logical pixels | ||
| ); | ||
| } | ||
|
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| double _getPage(ScrollMetrics position) { | ||
| return position.pixels / itemDimension; | ||
| } | ||
|
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| double _getPixels(double page) { | ||
| return page * itemDimension; | ||
| } | ||
|
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| double _getTargetPixels( | ||
| ScrollMetrics position, | ||
| Tolerance tolerance, | ||
| double velocity, | ||
| ) { | ||
| double page = _getPage(position); | ||
| if (velocity < -tolerance.velocity) { | ||
| page -= 0.5; | ||
| } else if (velocity > tolerance.velocity) { | ||
| page += 0.5; | ||
| } | ||
| return _getPixels(page.roundToDouble()); | ||
| } | ||
|
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||
| @override | ||
| Simulation? createBallisticSimulation( | ||
| ScrollMetrics position, | ||
| double velocity, | ||
| ) { | ||
| if ((velocity <= 0.0 && position.pixels <= position.minScrollExtent) || | ||
| (velocity >= 0.0 && position.pixels >= position.maxScrollExtent)) { | ||
| return super.createBallisticSimulation(position, velocity); | ||
| } | ||
| final Tolerance tolerance = toleranceFor(position); | ||
| final double target = _getTargetPixels(position, tolerance, velocity); | ||
| if (target != position.pixels) { | ||
| return ScrollSpringSimulation( | ||
| spring, | ||
| position.pixels, | ||
| target, | ||
| velocity, | ||
| tolerance: tolerance, | ||
| ); | ||
| } | ||
| return null; | ||
| } | ||
|
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| @override | ||
| bool get allowImplicitScrolling => false; | ||
| } |