Code Quality: Added extension helper for media files (#13828)

Author: yaira2

src/Files.App/Helpers/ContentLayout/AdaptiveLayoutHelpers.cs

@@ -1,15 +1,9 @@
 // Copyright (c) 2023 Files Community
 // Licensed under the MIT License. See the LICENSE.
 
-using CommunityToolkit.Mvvm.DependencyInjection;
-using Files.App.Utils;
-using Files.App.ViewModels;
 using Files.App.ViewModels.Previews;
-using Files.Core.Services.Settings;
+using Files.Shared.Helpers;
 using IniParser.Model;
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using Windows.Storage;
 using static Files.App.Constants.AdaptiveLayout;
 using IO = System.IO;
@@ -118,7 +112,8 @@ static bool IsImage(ListedItem item)
 
 			static bool IsMedia(ListedItem item)
 				=> !string.IsNullOrEmpty(item.FileExtension)
-				&& MediaPreviewViewModel.ContainsExtension(item.FileExtension.ToLowerInvariant());
+				&& (FileExtensionHelpers.IsAudioFile(item.FileExtension) 
+				|| FileExtensionHelpers.IsVideoFile(item.FileExtension));
 		}
 
 		private enum Layouts

src/Files.App/ViewModels/Previews/MediaPreviewViewModel.cs

@@ -20,14 +20,6 @@ public MediaSource Source
 
 		public MediaPreviewViewModel(ListedItem item) : base(item) { }
 
-		// TODO: Use existing helper mothods
-		public static bool ContainsExtension(string extension)
-			=> extension is
-			// Video
-			".mp4" or ".webm" or ".ogg" or ".mov" or ".qt" or ".mp4" or ".m4v" or ".mp4v" or ".3g2" or ".3gp2" or ".3gp" or ".3gpp" or ".mkv"
-			// Audio
-			or ".mp3" or ".m4a" or ".wav" or ".wma" or ".aac" or ".adt" or ".adts" or ".cda" or ".flac";
-
 		public void TogglePlayback()
 			=> TogglePlaybackRequested?.Invoke(this, null);
 

src/Files.App/ViewModels/UserControls/PreviewPaneViewModel.cs

@@ -198,7 +198,7 @@ private async Task<UserControl> GetBuiltInPreviewControlAsync(ListedItem item, b
 
 			var ext = item.FileExtension.ToLowerInvariant();
 
-			if (MediaPreviewViewModel.ContainsExtension(ext))
+			if (FileExtensionHelpers.IsAudioFile(ext) || FileExtensionHelpers.IsVideoFile(ext))
 			{
 				var model = new MediaPreviewViewModel(item);
 				await model.LoadAsync();

src/Files.Shared/Helpers/FileExtensionHelpers.cs

@@ -34,6 +34,26 @@ public static bool IsImageFile(string? fileExtensionToCheck)
 		{
 			return HasExtension(fileExtensionToCheck, ".png", ".bmp", ".jpg", ".jpeg", ".gif", ".tiff", ".tif");
 		}
+		
+		/// <summary>
+		/// Check if the file extension is an audio file.
+		/// </summary>
+		/// <param name="fileExtensionToCheck">The file extension to check.</param>
+		/// <returns><c>true</c> if the fileExtensionToCheck is an audio file; otherwise, <c>false</c>.</returns>
+		public static bool IsAudioFile(string? fileExtensionToCheck)
+		{
+			return HasExtension(fileExtensionToCheck, ".mp3", ".m4a", ".wav", ".wma", ".aac", ".adt", ".adts", ".cda", ".flac");
+		}
+		
+		/// <summary>
+		/// Check if the file extension is a video file.
+		/// </summary>
+		/// <param name="fileExtensionToCheck">The file extension to check.</param>
+		/// <returns><c>true</c> if the fileExtensionToCheck is a video file; otherwise, <c>false</c>.</returns>
+		public static bool IsVideoFile(string? fileExtensionToCheck)
+		{
+			return HasExtension(fileExtensionToCheck, ".mp4", ".webm", ".ogg", ".mov", ".qt", ".m4v", ".mp4v", ".3g2", ".3gp2", ".3gp", ".3gpp", ".mkv");
+		}
 
 		/// <summary>
 		/// Check if the file extension is a PowerShell script.