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d944b8728c
Committing this sample for posterity's sake. This is the product of an experiment: "can an extension know when it's page was opened / closed?" And without changing the actual SDK, this **is** possible. It relies on the fact that CmdPal (the host) needs to register for the `ItemsChanged` event on list pages, and it does that when the page is loaded, and it unregisters itself when the page is closed. This does require manually implementing `IListPage` - you can't just `override` the `event` in the base class ([that's illegal](https://learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca1070)), and using `new` to shadow it doesn't work either (probably for cswinrt reasons). This is the best I came up with.
83 lines
2.5 KiB
C#
83 lines
2.5 KiB
C#
// Copyright (c) Microsoft Corporation
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// The Microsoft Corporation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using Microsoft.CommandPalette.Extensions;
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using Microsoft.CommandPalette.Extensions.Toolkit;
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using Windows.Foundation;
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namespace SamplePagesExtension;
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internal sealed partial class OnLoadPage : IListPage
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{
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private readonly List<ListItem> _items = new();
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public IIconInfo Icon => new IconInfo("\uE8AB"); // switch
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public string Title => "Load/Unload sample";
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public string PlaceholderText => "This page changes each time you load it";
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public ICommandItem EmptyContent => new CommandItem() { Icon = new IconInfo("\uE8AB"), Title = "This page starts empty", Subtitle = "but go back and open it again" };
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public IFilters Filters => null;
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public IGridProperties GridProperties => null;
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public bool HasMoreItems => false;
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public string SearchText => string.Empty;
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public bool ShowDetails => false;
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public OptionalColor AccentColor => default;
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public bool IsLoading => false;
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public string Id => string.Empty;
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public string Name => "Open";
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#pragma warning disable CS0067 // The event is never used
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public event TypedEventHandler<object, IPropChangedEventArgs> PropChanged;
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private event TypedEventHandler<object, IItemsChangedEventArgs> InternalItemsChanged;
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#pragma warning restore CS0067 // The event is never used
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public event TypedEventHandler<object, IItemsChangedEventArgs> ItemsChanged
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{
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add
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{
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InternalItemsChanged += value;
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var nowString = DateTime.Now.ToString("T", CultureInfo.CurrentCulture);
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var item = new ListItem(new NoOpCommand())
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{
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Title = $"Loaded {nowString}",
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Icon = new IconInfo("\uECCB"), // Radio button on
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};
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_items.Add(item);
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}
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remove
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{
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InternalItemsChanged -= value;
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var nowString = DateTime.Now.ToString("T", CultureInfo.CurrentCulture);
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var item = new ListItem(new NoOpCommand())
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{
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Title = $"Unloaded {nowString}",
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Icon = new IconInfo("\uECCA"), // Radio button off
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};
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_items.Add(item);
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}
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}
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public IListItem[] GetItems() => _items.ToArray();
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public void LoadMore()
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{
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}
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}
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