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using System; |
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using System.Collections.Generic; |
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using System.Linq; |
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using uiwidgets; |
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using Unity.UIWidgets.animation; |
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using Unity.UIWidgets.async; |
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using Unity.UIWidgets.ui; |
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using Unity.UIWidgets.scheduler; |
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using UnityEngine; |
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using Color = Unity.UIWidgets.ui.Color; |
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namespace UIWidgetsSample |
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{ |
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{ |
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/// Used for pagination (infinite scroll) together with [onEndReached].
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/// When true, indicates that there are no more pages to load and
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/// pagination will not be triggered.
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public readonly bool? isLastPage; |
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/// Used for pagination (infinite scroll) together with [onEndReached].
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/// When true, indicates that there are no more pages to load and
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/// pagination will not be triggered.
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public readonly bool? isLastPage; |
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/// Item builder
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public readonly ItemBuilder itemBuilder; |
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} |
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/// [ChatList] widget state
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public class _ChatListState : SingleTickerProviderStateMixin<ChatList> |
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public class _ChatListState : SingleTickerProviderStateMixin<ChatList> |
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public AnimationController _controller ; |
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public Animation<float> _animation; |
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private bool _isNextPageLoading; |
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public List<object> _oldData ; |
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public Animation<float> _animation; |
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public AnimationController _controller; |
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public bool _isNextPageLoading; |
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public List<object> _oldData; |
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public override void initState() |
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{ |
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base.initState(); |
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curve: Curves.easeOutQuad, |
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parent: _controller |
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); |
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_isNextPageLoading = false; |
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_oldData = new List<object>(); |
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_oldData.AddRange(widget.items); |
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} |
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private void _calculateDiffs(List<object> oldList) |
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{ |
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_oldData = new List<object>(widget.items); |
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/*var diffResult = calculateListDiff<object>( |
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oldList, |
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widget.items, |
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equalityChecker: (item1, item2) => |
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{ |
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if (item1 is Dictionary<string, object> && item2 is Dictionary<string, object>) |
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{ |
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var message1 = item1["message"]! as ChatComponents.Message; |
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var message2 = item2["message"]! as ChatComponents.Message; |
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return message1.id == message2.id; |
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} |
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return item1 == item2; |
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} |
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); |
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foreach (var update in diffResult.getUpdates(batch: false)) |
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update.when( |
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insert: (pos, count) => { _listKey.currentState?.insertItem(pos); }, |
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remove: (pos, count) => |
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{ |
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var item = oldList[pos]; |
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_listKey.currentState?.removeItem( |
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pos, |
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(_, animation) => _buildRemovedMessage(item, animation) |
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); |
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}, |
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change: (pos, payload) => { }, |
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move: (from, to) => { } |
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); |
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foreach (var item1 in widget.items) |
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{ |
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if (item1 is Dictionary<string, object> ) |
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{ |
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var message1 = ((Dictionary<string, object>)item1)["message"] as ChatComponents.Message; |
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if(message1!=null) |
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_listKey.currentState?.insertItem(0); |
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} |
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} |
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foreach (var item1 in oldList) |
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{ |
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foreach (var item2 in widget.items) |
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{ |
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if (item1 is Dictionary<string, object> && item2 is Dictionary<string, object>) |
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{ |
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var message1 = ((Dictionary<string, object>)item1)["message"]! as ChatComponents.Message; |
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var message2 = ((Dictionary<string, object>)item2)["message"]! as ChatComponents.Message; |
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return message1.id == message2.id; |
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} |
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return item1 == item2; |
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} |
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} |
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}*/ |
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// Hacky solution to reconsider
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private void _scrollToBottomIfNeeded(List<object> oldList) |
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{ |
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if (widget.onEndReached == null || widget.isLastPage == true) return false; |
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if (notification.metrics.pixels >= |
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notification.metrics.maxScrollExtent * |
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(widget.onEndReachedThreshold ?? 0.75)) |
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var _onEndReachedThreshold = |
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widget.onEndReachedThreshold == null ? 0.75f : (float) widget.onEndReachedThreshold; |
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if (notification.metrics.pixels >= notification.metrics.maxScrollExtent * _onEndReachedThreshold) |
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if (widget.items.isEmpty() || _isNextPageLoading) return false; |
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if (widget.items.isEmpty() || _isNextPageLoading) |
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return false; |
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_controller.duration = new TimeSpan(); |
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_controller.forward(); |
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SchedulerBinding.instance.addPostFrameCallback(stamp => |
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{ |
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_controller.duration = TimeSpan.Zero; |
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_controller.forward(); |
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setState(() => { _isNextPageLoading = true; }); |
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setState(() => { _isNextPageLoading = true; }); |
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widget.onEndReached().whenComplete(() => |
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{ |
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_controller.duration = TimeSpan.FromMilliseconds(300); |
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_controller.reverse(); |
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setState(() => { _isNextPageLoading = false; }); |
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widget.onEndReached().whenComplete(() => |
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{ |
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_controller.duration = TimeSpan.FromMilliseconds(300); |
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_controller.reverse(); |
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setState(() => { _isNextPageLoading = false; }); |
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}); |
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}); |
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} |
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initialItemCount: widget.items.Count, |
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key: _listKey, |
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itemBuilder: (_, index, animation) => |
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_buildNewMessage(index, animation) |
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{ |
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return _buildNewMessage(index, animation); |
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} |
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) |
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), |
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new SliverPadding( |
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shiyun wen
4 年前