Initial commit.
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Burak Kaan Köse
382
Wino.Mail/Controls/Advanced/WinoListView.cs
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382
Wino.Mail/Controls/Advanced/WinoListView.cs
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using System;
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using System.Linq;
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using System.Windows.Input;
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using CommunityToolkit.Mvvm.Messaging;
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using Microsoft.UI.Xaml.Controls;
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using MoreLinq;
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using Serilog;
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using Windows.UI.Xaml;
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using Windows.UI.Xaml.Controls;
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using Wino.Core.Domain.Enums;
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using Wino.Core.Domain.Models.MailItem;
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using Wino.Extensions;
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using Wino.Mail.ViewModels.Data;
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using Wino.Mail.ViewModels.Messages;
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namespace Wino.Controls.Advanced
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{
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/// <summary>
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/// Custom ListView control that handles multiple selection with Extended/Multiple selection mode
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/// and supports threads.
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/// </summary>
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public class WinoListView : ListView, IDisposable
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{
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private ILogger logger = Log.ForContext<WinoListView>();
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private const string PART_ScrollViewer = "ScrollViewer";
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private ScrollViewer internalScrollviewer;
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/// <summary>
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/// Gets or sets whether this ListView belongs to thread items.
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/// This is important for detecting selected items etc.
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/// </summary>
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public bool IsThreadListView
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{
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get { return (bool)GetValue(IsThreadListViewProperty); }
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set { SetValue(IsThreadListViewProperty, value); }
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}
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public ICommand ItemDeletedCommand
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{
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get { return (ICommand)GetValue(ItemDeletedCommandProperty); }
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set { SetValue(ItemDeletedCommandProperty, value); }
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}
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public ICommand LoadMoreCommand
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{
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get { return (ICommand)GetValue(LoadMoreCommandProperty); }
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set { SetValue(LoadMoreCommandProperty, value); }
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}
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public static readonly DependencyProperty LoadMoreCommandProperty = DependencyProperty.Register(nameof(LoadMoreCommand), typeof(ICommand), typeof(WinoListView), new PropertyMetadata(null));
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public static readonly DependencyProperty IsThreadListViewProperty = DependencyProperty.Register(nameof(IsThreadListView), typeof(bool), typeof(WinoListView), new PropertyMetadata(false));
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public static readonly DependencyProperty ItemDeletedCommandProperty = DependencyProperty.Register(nameof(ItemDeletedCommand), typeof(ICommand), typeof(WinoListView), new PropertyMetadata(null));
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public WinoListView()
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{
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CanDragItems = true;
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IsItemClickEnabled = true;
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IsMultiSelectCheckBoxEnabled = true;
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IsRightTapEnabled = true;
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SelectionMode = ListViewSelectionMode.Extended;
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ShowsScrollingPlaceholders = false;
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SingleSelectionFollowsFocus = true;
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DragItemsCompleted += ItemDragCompleted;
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DragItemsStarting += ItemDragStarting;
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SelectionChanged += SelectedItemsChanged;
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ItemClick += MailItemClicked;
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ProcessKeyboardAccelerators += ProcessDelKey;
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}
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protected override void OnApplyTemplate()
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{
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base.OnApplyTemplate();
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internalScrollviewer = GetTemplateChild(PART_ScrollViewer) as ScrollViewer;
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if (internalScrollviewer == null)
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{
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logger.Warning("WinoListView does not have an internal ScrollViewer. Infinite scrolling behavior might be effected.");
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return;
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}
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internalScrollviewer.ViewChanged -= InternalScrollVeiwerViewChanged;
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internalScrollviewer.ViewChanged += InternalScrollVeiwerViewChanged;
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}
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private double lastestRaisedOffset = 0;
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private int lastItemSize = 0;
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// TODO: This is buggy. Does not work all the time. Debug.
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private void InternalScrollVeiwerViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
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{
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if (internalScrollviewer == null) return;
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// No need to raise init request if there are no items in the list.
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if (Items.Count == 0) return;
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// If the scrolling is finished, check the current viewport height.
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if (e.IsIntermediate)
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{
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var currentOffset = internalScrollviewer.VerticalOffset;
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var maxOffset = internalScrollviewer.ScrollableHeight;
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if (currentOffset + 10 >= maxOffset && lastestRaisedOffset != maxOffset && Items.Count != lastItemSize)
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{
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// We must load more.
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lastestRaisedOffset = maxOffset;
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lastItemSize = Items.Count;
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LoadMoreCommand?.Execute(null);
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}
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}
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}
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private void ProcessDelKey(UIElement sender, Windows.UI.Xaml.Input.ProcessKeyboardAcceleratorEventArgs args)
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{
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if (args.Key == Windows.System.VirtualKey.Delete)
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{
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args.Handled = true;
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ItemDeletedCommand?.Execute((int)MailOperation.SoftDelete);
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}
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}
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private void ItemDragCompleted(ListViewBase sender, DragItemsCompletedEventArgs args)
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{
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if (args.Items.Any(a => a is MailItemViewModel))
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{
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args.Items.Cast<MailItemViewModel>().ForEach(a => a.IsCustomFocused = false);
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}
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}
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private void ItemDragStarting(object sender, DragItemsStartingEventArgs args)
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{
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// Dragging multiple mails from different accounts/folders are supported with the condition below:
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// All mails belongs to the drag will be matched on the dropped folder's account.
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// Meaning that if users drag 1 mail from Account A/Inbox and 1 mail from Account B/Inbox,
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// and drop to Account A/Inbox, the mail from Account B/Inbox will NOT be moved.
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if (IsThreadListView)
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{
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var allItems = args.Items.Cast<MailItemViewModel>();
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// Highlight all items
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allItems.ForEach(a => a.IsCustomFocused = true);
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// Set native drag arg properties.
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var dragPackage = new MailDragPackage(allItems.Cast<IMailItem>());
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args.Data.Properties.Add(nameof(MailDragPackage), dragPackage);
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}
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else
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{
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var dragPackage = new MailDragPackage(args.Items.Cast<IMailItem>());
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args.Data.Properties.Add(nameof(MailDragPackage), dragPackage);
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}
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}
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private void MailItemClicked(object sender, ItemClickEventArgs e)
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{
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if (e.ClickedItem is ThreadMailItemViewModel clickedThread)
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{
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clickedThread.IsThreadExpanded = !clickedThread.IsThreadExpanded;
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if (!clickedThread.IsThreadExpanded)
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{
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SelectedItems.Clear();
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}
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}
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}
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public void ChangeSelectionMode(ListViewSelectionMode selectionMode)
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{
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SelectionMode = selectionMode;
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if (!IsThreadListView)
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{
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Items.Where(a => a is ThreadMailItemViewModel).Cast<ThreadMailItemViewModel>().ForEach(c =>
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{
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var threadListView = GetThreadInternalListView(c);
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if (threadListView != null)
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{
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threadListView.SelectionMode = selectionMode;
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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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/// Finds the container for given mail item and adds it to selected items.
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/// </summary>
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/// <param name="mailItemViewModel">Mail to be added to selected items.</param>
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/// <returns>Whether selection was successful or not.</returns>
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public bool SelectMailItemContainer(MailItemViewModel mailItemViewModel)
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{
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var itemContainer = ContainerFromItem(mailItemViewModel);
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// This item might be in thread container.
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if (itemContainer == null)
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{
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bool found = false;
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Items.Where(a => a is ThreadMailItemViewModel).Cast<ThreadMailItemViewModel>().ForEach(c =>
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{
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if (!found)
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{
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var threadListView = GetThreadInternalListView(c);
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if (threadListView != null)
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found = threadListView.SelectMailItemContainer(mailItemViewModel);
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}
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});
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return found;
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}
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SelectedItems.Add(mailItemViewModel);
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return true;
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}
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/// <summary>
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/// Recursively clears all selections except the given mail.
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/// </summary>
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/// <param name="exceptViewModel">Exceptional mail item to be not unselected.</param>
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/// <param name="preserveThreadExpanding">Whether expansion states of thread containers should stay as it is or not.</param>
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public void ClearSelections(MailItemViewModel exceptViewModel = null, bool preserveThreadExpanding = false)
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{
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SelectedItems.Clear();
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Items.Where(a => a is ThreadMailItemViewModel).Cast<ThreadMailItemViewModel>().ForEach(c =>
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{
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var threadListView = GetThreadInternalListView(c);
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if (threadListView == null)
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return;
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if (exceptViewModel != null)
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{
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if (!threadListView.SelectedItems.Contains(exceptViewModel))
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{
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if (!preserveThreadExpanding)
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{
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c.IsThreadExpanded = false;
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}
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threadListView.SelectedItems.Clear();
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}
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}
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else
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{
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if (!preserveThreadExpanding)
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{
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c.IsThreadExpanded = false;
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}
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threadListView.SelectedItems.Clear();
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}
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});
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}
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/// <summary>
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/// Recursively selects all mails, including thread items.
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/// </summary>
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public void SelectAllWino()
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{
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SelectAll();
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Items.Where(a => a is ThreadMailItemViewModel).Cast<ThreadMailItemViewModel>().ForEach(c =>
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{
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c.IsThreadExpanded = true;
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var threadListView = GetThreadInternalListView(c);
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threadListView?.SelectAll();
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});
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}
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// SelectedItems changed.
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private void SelectedItemsChanged(object sender, SelectionChangedEventArgs e)
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{
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if (e.RemovedItems != null)
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{
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foreach (var removedItem in e.RemovedItems)
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{
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if (removedItem is MailItemViewModel removedMailItemViewModel)
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{
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// Mail item un-selected.
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removedMailItemViewModel.IsSelected = false;
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WeakReferenceMessenger.Default.Send(new MailItemSelectionRemovedEvent(removedMailItemViewModel));
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}
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}
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}
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if (e.AddedItems != null)
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{
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foreach (var addedItem in e.AddedItems)
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{
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if (addedItem is MailItemViewModel addedMailItemViewModel)
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{
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// Mail item selected.
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addedMailItemViewModel.IsSelected = true;
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WeakReferenceMessenger.Default.Send(new MailItemSelectedEvent(addedMailItemViewModel));
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}
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else if (addedItem is ThreadMailItemViewModel threadMailItemViewModel)
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{
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threadMailItemViewModel.IsThreadExpanded = true;
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// Don't select thread containers.
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SelectedItems.Remove(addedItem);
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}
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}
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}
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if (!IsThreadListView)
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{
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if (SelectionMode == ListViewSelectionMode.Extended && SelectedItems.Count == 1)
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{
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// Only 1 single item is selected in extended mode for main list view.
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// We should un-select all thread items.
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Items.Where(a => a is ThreadMailItemViewModel).Cast<ThreadMailItemViewModel>().ForEach(c =>
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{
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// c.IsThreadExpanded = false;
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var threadListView = GetThreadInternalListView(c);
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threadListView?.SelectedItems.Clear();
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});
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}
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}
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else
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{
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if (SelectionMode == ListViewSelectionMode.Extended && SelectedItems.Count == 1)
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{
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// Tell main list view to unselect all his items.
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if (SelectedItems[0] is MailItemViewModel selectedMailItemViewModel)
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{
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WeakReferenceMessenger.Default.Send(new ResetSingleMailItemSelectionEvent(selectedMailItemViewModel));
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}
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}
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}
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}
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private WinoListView GetThreadInternalListView(ThreadMailItemViewModel threadMailItemViewModel)
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{
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var itemContainer = ContainerFromItem(threadMailItemViewModel);
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if (itemContainer is ListViewItem listItem)
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{
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var expander = listItem.GetChildByName<Expander>("ThreadExpander");
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if (expander != null)
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return expander.Content as WinoListView;
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}
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return null;
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}
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public void Dispose()
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{
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DragItemsCompleted -= ItemDragCompleted;
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DragItemsStarting -= ItemDragStarting;
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SelectionChanged -= SelectedItemsChanged;
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ItemClick -= MailItemClicked;
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ProcessKeyboardAccelerators -= ProcessDelKey;
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if (internalScrollviewer != null)
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{
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internalScrollviewer.ViewChanged -= InternalScrollVeiwerViewChanged;
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}
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}
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}
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}
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