Adjust project structure
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using System.Collections;
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using System.Collections.Generic;
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using System.Collections.Specialized;
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using System.Windows;
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using System.Windows.Data;
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using HandyControl.Data;
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using HandyControl.Tools;
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namespace HandyControl.Controls
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{
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public class CoverView : RegularItemsControl
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{
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private readonly CoverViewContent _viewContent;
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private CoverViewItem _selectedItem;
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private IEnumerable _itemsSourceInternal;
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private readonly Dictionary<object, CoverViewItem> _entryDic = new Dictionary<object, CoverViewItem>();
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private bool _isRefresh;
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public CoverView()
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{
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_viewContent = new CoverViewContent();
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AddHandler(SelectableItem.SelectedEvent, new RoutedEventHandler(CoverViewItem_OnSelected));
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_viewContent.SetBinding(CoverViewContent.ContentHeightProperty, new Binding(ItemContentHeightProperty.Name) { Source = this });
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_viewContent.SetBinding(WidthProperty, new Binding(ActualWidthProperty.Name) { Source = this });
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}
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private void CoverViewItem_OnSelected(object sender, RoutedEventArgs e)
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{
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if (e.OriginalSource is CoverViewItem item)
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{
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if (_selectedItem == null)
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{
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item.IsSelected = true;
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_selectedItem = item;
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if (_viewContent != null)
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{
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_viewContent.Content = item.Content;
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_viewContent.ContentTemplate = ItemTemplate;
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UpdateCoverViewContent(true);
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}
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return;
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}
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if (!Equals(_selectedItem, item))
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{
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_selectedItem.IsSelected = false;
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item.IsSelected = true;
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_selectedItem = item;
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if (_viewContent != null)
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{
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_viewContent.Content = item.Content;
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UpdateCoverViewContent(true);
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}
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return;
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}
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if (_viewContent != null)
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{
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_viewContent.Content = null;
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_viewContent.ContentTemplate = null;
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UpdateCoverViewContent(false);
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}
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_selectedItem.IsSelected = false;
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_selectedItem = null;
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}
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}
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public override void OnApplyTemplate()
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{
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base.OnApplyTemplate();
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if (_viewContent.Style == null)
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{
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_viewContent.Style = CoverViewContentStyle;
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}
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if (_selectedItem != null)
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{
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UpdateCoverViewContent(_selectedItem != null);
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}
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}
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protected override DependencyObject GetContainerForItemOverride() => new CoverViewItem();
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private void SetBindingForItem(FrameworkElement item)
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{
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item.SetBinding(MarginProperty, new Binding(ItemMarginProperty.Name) { Source = this });
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item.SetBinding(WidthProperty, new Binding(ItemWidthProperty.Name) { Source = this });
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item.SetBinding(HeightProperty, new Binding(ItemHeightProperty.Name) { Source = this });
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item.SetBinding(HeaderedSelectableItem.HeaderTemplateProperty, new Binding(ItemHeaderTemplateProperty.Name) { Source = this });
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}
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protected override bool IsItemItsOwnContainerOverride(object item) => item is CoverViewItem;
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public static readonly DependencyProperty CoverViewContentStyleProperty = DependencyProperty.Register(
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"CoverViewContentStyle", typeof(Style), typeof(CoverView), new PropertyMetadata(default(Style)));
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public Style CoverViewContentStyle
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{
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get => (Style)GetValue(CoverViewContentStyleProperty);
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set => SetValue(CoverViewContentStyleProperty, value);
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}
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internal static readonly DependencyProperty GroupsProperty = DependencyProperty.Register(
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"Groups", typeof(int), typeof(CoverView),
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new FrameworkPropertyMetadata(ValueBoxes.Int5Box, FrameworkPropertyMetadataOptions.AffectsMeasure,
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OnGroupsChanged), IsGroupsValid);
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internal static void OnGroupsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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if (d is CoverView ctl)
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{
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ctl.UpdateCoverViewContent(ctl._viewContent.IsOpen);
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}
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}
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private static bool IsGroupsValid(object value)
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{
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var v = (int)value;
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return v >= 1;
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}
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public int Groups
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{
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get => (int)GetValue(GroupsProperty);
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set => SetValue(GroupsProperty, value);
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}
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public static readonly DependencyProperty ItemContentHeightProperty = DependencyProperty.Register(
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"ItemContentHeight", typeof(double), typeof(CoverView), new PropertyMetadata(ValueBoxes.Double300Box),
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value => ValidateHelper.IsInRangeOfPosDouble(value, true));
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public double ItemContentHeight
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{
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get => (double)GetValue(ItemContentHeightProperty);
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set => SetValue(ItemContentHeightProperty, value);
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}
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public static readonly DependencyProperty ItemContentHeightFixedProperty = DependencyProperty.Register(
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"ItemContentHeightFixed", typeof(bool), typeof(CoverView), new PropertyMetadata(ValueBoxes.TrueBox));
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public bool ItemContentHeightFixed
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{
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get => (bool)GetValue(ItemContentHeightFixedProperty);
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set => SetValue(ItemContentHeightFixedProperty, value);
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}
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public static readonly DependencyProperty ItemHeaderTemplateProperty = DependencyProperty.Register(
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"ItemHeaderTemplate", typeof(DataTemplate), typeof(CoverView), new PropertyMetadata(default(DataTemplate)));
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public DataTemplate ItemHeaderTemplate
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{
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get => (DataTemplate) GetValue(ItemHeaderTemplateProperty);
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set => SetValue(ItemHeaderTemplateProperty, value);
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}
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protected override void OnRenderSizeChanged(SizeChangedInfo sizeInfo)
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{
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base.OnRenderSizeChanged(sizeInfo);
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Groups = (int)(sizeInfo.NewSize.Width / (ItemWidth + ItemMargin.Left + ItemMargin.Right));
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}
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protected override void Refresh()
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{
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if (ItemsHost == null) return;
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_entryDic.Clear();
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_isRefresh = true;
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foreach (var item in Items)
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{
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AddItem(item);
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}
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_isRefresh = false;
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GenerateIndex();
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UpdateCoverViewContent(_viewContent.IsOpen);
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}
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/// <summary>
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/// 更新内容视图
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/// </summary>
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private void UpdateCoverViewContent(bool isOpen)
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{
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if (_selectedItem == null) return;
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ItemsHost.Children.Remove(_viewContent);
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if (!ItemContentHeightFixed)
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{
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_viewContent.ManualHeight = 0;
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if (_viewContent.Content is FrameworkElement element)
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{
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element.VerticalAlignment = VerticalAlignment.Top;
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element.Arrange(new Rect(new Size(double.MaxValue, double.MaxValue)));
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_viewContent.ManualHeight = element.ActualHeight;
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}
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}
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UpdateCoverViewContentPosition();
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if (_viewContent.CanSwitch)
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{
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_viewContent.IsOpen = isOpen;
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}
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}
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/// <summary>
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/// 更新内容视图位置
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/// </summary>
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private void UpdateCoverViewContentPosition()
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{
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if (_viewContent.Parent != null)
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{
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ItemsHost.Children.Remove(_viewContent);
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}
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var total = Items.Count + 1;
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var totalRow = total / Groups + (total % Groups > 0 ? 1 : 0);
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if (total <= Groups)
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{
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ItemsHost.Children.Add(_viewContent);
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}
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else
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{
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var row = _selectedItem.Index / Groups + 1;
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if (row == totalRow)
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{
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ItemsHost.Children.Add(_viewContent);
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}
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else
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{
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ItemsHost.Children.Insert(row * Groups, _viewContent);
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}
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}
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_viewContent.UpdatePosition(_selectedItem.Index, Groups, _selectedItem.DesiredSize.Width);
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}
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protected override void OnItemsSourceChanged(IEnumerable oldValue, IEnumerable newValue)
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{
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if (_itemsSourceInternal != null)
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{
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if (_itemsSourceInternal is INotifyCollectionChanged s)
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{
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s.CollectionChanged -= InternalCollectionChanged;
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}
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Items.Clear();
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ClearItems();
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}
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_itemsSourceInternal = newValue;
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if (_itemsSourceInternal != null)
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{
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if (_itemsSourceInternal is INotifyCollectionChanged s)
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{
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s.CollectionChanged += InternalCollectionChanged;
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}
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foreach (var item in _itemsSourceInternal)
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{
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AddItem(item);
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}
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}
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if (ItemsHost != null)
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{
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GenerateIndex();
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}
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}
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private void ClearItems()
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{
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_selectedItem = null;
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_viewContent.Content = null;
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_viewContent.ContentTemplate = null;
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if (ItemsHost != null)
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{
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ItemsHost.Children.Remove(_viewContent);
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ItemsHost.Children.Clear();
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}
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_entryDic.Clear();
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}
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private void RemoveItem(object item)
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{
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if (_entryDic.TryGetValue(item, out var entry))
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{
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if (ReferenceEquals(entry, _selectedItem))
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{
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_selectedItem = null;
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if (_viewContent != null)
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{
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_viewContent.Content = null;
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_viewContent.IsOpen = false;
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ItemsHost.Children.Remove(_viewContent);
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}
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}
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ItemsHost.Children.Remove(entry);
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Items.Remove(item);
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_entryDic.Remove(item);
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}
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}
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private void AddItem(object item) => InsertItem(_entryDic.Count, item);
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private void InsertItem(int index, object item)
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{
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if (ItemsHost == null)
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{
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Items.Insert(index, item);
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_entryDic.Add(item, null);
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}
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else
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{
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DependencyObject container;
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if (IsItemItsOwnContainerOverride(item))
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{
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container = item as DependencyObject;
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}
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else
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{
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container = GetContainerForItemOverride();
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PrepareContainerForItemOverride(container, item);
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}
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if (container is CoverViewItem element)
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{
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SetBindingForItem(element);
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element.Style = ItemContainerStyle;
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if (element.Header == null)
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{
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element.Header = item;
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}
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_entryDic[item] = element;
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ItemsHost.Children.Insert(index, element);
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if (IsLoaded && !_isRefresh && _itemsSourceInternal != null)
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{
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Items.Insert(index, item);
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}
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}
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}
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}
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/// <summary>
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/// 生成序号
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/// </summary>
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private void GenerateIndex()
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{
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var index = 0;
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foreach (var item in Items)
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{
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_entryDic[item].Index = index++;
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}
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}
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private void InternalCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
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{
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if (ItemsHost == null) return;
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if (e.Action == NotifyCollectionChangedAction.Reset)
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{
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if (_entryDic.Count == 0) return;
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ClearItems();
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Items.Clear();
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return;
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}
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if (e.OldItems != null)
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{
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foreach (var item in e.OldItems)
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{
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RemoveItem(item);
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}
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}
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if (e.NewItems != null)
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{
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if (_viewContent.IsOpen)
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{
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ItemsHost.Children.Remove(_viewContent);
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}
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var count = 0;
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foreach (var item in e.NewItems)
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{
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var index = e.NewStartingIndex + count++;
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InsertItem(index, item);
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}
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}
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GenerateIndex();
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if (_viewContent.IsOpen)
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{
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UpdateCoverViewContentPosition();
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}
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}
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protected override void OnItemsChanged(object sender, NotifyCollectionChangedEventArgs e)
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{
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if (_itemsSourceInternal != null) return;
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InternalCollectionChanged(sender, e);
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}
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protected override void OnItemTemplateChanged(DependencyPropertyChangedEventArgs e)
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{
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}
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protected override void OnItemContainerStyleChanged(DependencyPropertyChangedEventArgs e)
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{
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}
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}
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}
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