Fix: Fixed issue where resizing window would reload preview (#14227)

Author: hishitetsu

src/Files.App/ViewModels/MainPageViewModel.cs

@@ -36,6 +36,27 @@ public TabBarItem? SelectedTabItem
 			set => SetProperty(ref selectedTabItem, value);
 		}
 
+		private bool shouldViewControlBeDisplayed;
+		public bool ShouldViewControlBeDisplayed
+		{
+			get => shouldViewControlBeDisplayed;
+			set => SetProperty(ref shouldViewControlBeDisplayed, value);
+		}
+
+		private bool shouldPreviewPaneBeActive;
+		public bool ShouldPreviewPaneBeActive
+		{
+			get => shouldPreviewPaneBeActive;
+			set => SetProperty(ref shouldPreviewPaneBeActive, value);
+		}
+
+		private bool shouldPreviewPaneBeDisplayed;
+		public bool ShouldPreviewPaneBeDisplayed
+		{
+			get => shouldPreviewPaneBeDisplayed;
+			set => SetProperty(ref shouldPreviewPaneBeDisplayed, value);
+		}
+
 		// Commands
 
 		public ICommand NavigateToNumberedTabKeyboardAcceleratorCommand { get; }

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

@@ -129,7 +129,7 @@ private void ContentPageContext_PropertyChanged(object? sender, PropertyChangedE
 					else
 						SelectedItem = null;
 
-					var shouldUpdatePreview = ((MainWindow.Instance.Content as Frame)?.Content as MainPage)?.ShouldPreviewPaneBeActive;
+					var shouldUpdatePreview = ((MainWindow.Instance.Content as Frame)?.Content as MainPage)?.ViewModel.ShouldPreviewPaneBeActive;
 					if (shouldUpdatePreview == true)
 						_ = UpdateSelectedItemPreviewAsync();
 					break;

src/Files.App/Views/MainPage.xaml

@@ -11,7 +11,6 @@
 	xmlns:sidebar="using:Files.App.UserControls.Sidebar"
 	xmlns:tabbar="using:Files.App.UserControls.TabBar"
 	xmlns:toolkit="using:CommunityToolkit.WinUI.UI.Controls"
-	xmlns:triggers="using:CommunityToolkit.WinUI.UI.Triggers"
 	xmlns:uc="using:Files.App.UserControls"
 	xmlns:viewmodels="using:Files.App.ViewModels"
 	xmlns:wctconverters="using:CommunityToolkit.WinUI.UI.Converters"
@@ -238,8 +237,8 @@
 					Grid.ColumnSpan="3"
 					x:Load="False"
 					Loaded="NavToolbar_Loaded"
-					ShowPreviewPaneButton="{x:Bind ShouldPreviewPaneBeDisplayed, Mode=OneWay}"
-					ShowViewControlButton="{x:Bind ShouldViewControlBeDisplayed, Mode=OneWay}"
+					ShowPreviewPaneButton="{x:Bind ViewModel.ShouldPreviewPaneBeDisplayed, Mode=OneWay}"
+					ShowViewControlButton="{x:Bind ViewModel.ShouldViewControlBeDisplayed, Mode=OneWay}"
 					TabIndex="2" />
 
 				<!--  Page Content  -->
@@ -255,7 +254,7 @@
 					x:Name="PaneSplitter"
 					Grid.Row="1"
 					Grid.Column="1"
-					x:Load="{x:Bind ShouldPreviewPaneBeActive, Mode=OneWay}"
+					x:Load="{x:Bind ViewModel.ShouldPreviewPaneBeActive, Mode=OneWay}"
 					ManipulationCompleted="PaneSplitter_ManipulationCompleted"
 					ManipulationStarted="PaneSplitter_ManipulationStarted"
 					ResizeBehavior="BasedOnAlignment"
@@ -267,7 +266,7 @@
 					Grid.Row="1"
 					Grid.Column="2"
 					HorizontalContentAlignment="Stretch"
-					x:Load="{x:Bind ShouldPreviewPaneBeActive, Mode=OneWay}"
+					x:Load="{x:Bind ViewModel.ShouldPreviewPaneBeActive, Mode=OneWay}"
 					Loaded="PreviewPane_Loaded"
 					Unloaded="PreviewPane_Unloaded" />
 

src/Files.App/Views/MainPage.xaml.cs

@@ -12,7 +12,6 @@
 using Microsoft.UI.Xaml.Controls;
 using Microsoft.UI.Xaml.Input;
 using Microsoft.UI.Xaml.Navigation;
-using System.Runtime.CompilerServices;
 using Windows.ApplicationModel;
 using Windows.Foundation.Metadata;
 using Windows.Services.Store;
@@ -21,7 +20,7 @@
 
 namespace Files.App.Views
 {
-	public sealed partial class MainPage : Page, INotifyPropertyChanged
+	public sealed partial class MainPage : Page
 	{
 		public IUserSettingsService UserSettingsService { get; }
 		public IApplicationService ApplicationService { get; }
@@ -62,6 +61,7 @@ public MainPage()
 			if (FilePropertiesHelpers.FlowDirectionSettingIsRightToLeft)
 				FlowDirection = FlowDirection.RightToLeft;
 
+			ViewModel.PropertyChanged += ViewModel_PropertyChanged;
 			UserSettingsService.OnSettingChangedEvent += UserSettingsService_OnSettingChangedEvent;
 
 			_updateDateDisplayTimer = DispatcherQueue.CreateTimer();
@@ -363,7 +363,7 @@ private void SidebarControl_Loaded(object sender, RoutedEventArgs e)
 		/// </summary>
 		private void UpdatePositioning()
 		{
-			if (PreviewPane is null || !ShouldPreviewPaneBeActive)
+			if (PreviewPane is null || !ViewModel.ShouldPreviewPaneBeActive)
 			{
 				PaneRow.MinHeight = 0;
 				PaneRow.MaxHeight = double.MaxValue;
@@ -434,39 +434,23 @@ private void PaneSplitter_ManipulationCompleted(object sender, ManipulationCompl
 			this.ChangeCursor(InputSystemCursor.Create(InputSystemCursorShape.Arrow));
 		}
 
-		public bool ShouldViewControlBeDisplayed => SidebarAdaptiveViewModel.PaneHolder?.ActivePane?.InstanceViewModel?.IsPageTypeNotHome ?? false;
-
-		public bool ShouldPreviewPaneBeActive => UserSettingsService.InfoPaneSettingsService.IsEnabled && ShouldPreviewPaneBeDisplayed;
-
-		public bool ShouldPreviewPaneBeDisplayed
+		private void LoadPaneChanged()
 		{
-			get
-			{
-				var isHomePage = !(SidebarAdaptiveViewModel.PaneHolder?.ActivePane?.InstanceViewModel?.IsPageTypeNotHome ?? false);
-				var isMultiPane = SidebarAdaptiveViewModel.PaneHolder?.IsMultiPaneActive ?? false;
-				var isBigEnough = MainWindow.Instance.Bounds.Width > 450 && MainWindow.Instance.Bounds.Height > 450 || RootGrid.ActualWidth > 700 && MainWindow.Instance.Bounds.Height > 360;
-				var isEnabled = (!isHomePage || isMultiPane) && isBigEnough;
+			var isHomePage = !(SidebarAdaptiveViewModel.PaneHolder?.ActivePane?.InstanceViewModel?.IsPageTypeNotHome ?? false);
+			var isMultiPane = SidebarAdaptiveViewModel.PaneHolder?.IsMultiPaneActive ?? false;
+			var isBigEnough = MainWindow.Instance.Bounds.Width > 450 && MainWindow.Instance.Bounds.Height > 450 || RootGrid.ActualWidth > 700 && MainWindow.Instance.Bounds.Height > 360;
 
-				return isEnabled;
-			}
-		}
+			ViewModel.ShouldPreviewPaneBeDisplayed = (!isHomePage || isMultiPane) && isBigEnough;
+			ViewModel.ShouldPreviewPaneBeActive = UserSettingsService.InfoPaneSettingsService.IsEnabled && ViewModel.ShouldPreviewPaneBeDisplayed;
+			ViewModel.ShouldViewControlBeDisplayed = SidebarAdaptiveViewModel.PaneHolder?.ActivePane?.InstanceViewModel?.IsPageTypeNotHome ?? false;
 
-		private void LoadPaneChanged()
-		{
-			OnPropertyChanged(nameof(ShouldViewControlBeDisplayed));
-			OnPropertyChanged(nameof(ShouldPreviewPaneBeActive));
-			OnPropertyChanged(nameof(ShouldPreviewPaneBeDisplayed));
 			UpdatePositioning();
 		}
 
-		public event PropertyChangedEventHandler? PropertyChanged;
-
-		private void OnPropertyChanged([CallerMemberName] string propertyName = "")
+		private async void ViewModel_PropertyChanged(object? sender, PropertyChangedEventArgs e)
 		{
-			PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
-
-			if (propertyName == nameof(ShouldPreviewPaneBeActive) && ShouldPreviewPaneBeActive)
-				_ = Ioc.Default.GetRequiredService<InfoPaneViewModel>().UpdateSelectedItemPreviewAsync();
+			if (e.PropertyName == nameof(ViewModel.ShouldPreviewPaneBeActive) && ViewModel.ShouldPreviewPaneBeActive)
+				await Ioc.Default.GetRequiredService<InfoPaneViewModel>().UpdateSelectedItemPreviewAsync();
 		}
 
 		private void RootGrid_PreviewKeyDown(object sender, KeyRoutedEventArgs e)