feat: 起動時のウィンドウちらつきを軽減する対策

- ウィンドウ生成直後にWin32でウィンドウ色を直接指定してみる

Author: neelabo

NeeView/App.xaml.cs

@@ -24,7 +24,6 @@ public partial class App : Application
 
 
         private bool _isSplashScreenVisible;
-        public SplashScreen? _splashScreen;
         private bool _isTerminated;
         private readonly int _tickBase = System.Environment.TickCount;
         private CommandLineOption? _option;
@@ -365,19 +364,11 @@ public void ShowSplashScreen(BootSetting bootSetting)
 
                 using var span = DebugSpan();
                 var resourceName = "Resources/SplashScreen.png";
-                _splashScreen = new SplashScreen(resourceName);
-                _splashScreen.Show(true, true);
+                var splashScreen = new SplashScreen(resourceName);
+                splashScreen.Show(true, true);
             }
         }
 
-        /// <summary>
-        /// Close SplashScreen
-        /// </summary>
-        public void CloseSplashScreen()
-        {
-            //_splashScreen?.Close(TimeSpan.FromMilliseconds(0));
-        }
-
         /// <summary>
         /// 多重起動用実行可能判定
         /// </summary>

NeeView/MainWindow/MainWindow.xaml.cs

@@ -2,6 +2,7 @@
 
 using NeeLaboratory.ComponentModel;
 using NeeLaboratory.Generators;
+using NeeView.Interop;
 using NeeView.Native;
 using NeeView.Setting;
 using NeeView.Threading;
@@ -12,6 +13,7 @@
 using System.Linq;
 using System.Windows;
 using System.Windows.Input;
+using System.Windows.Interop;
 using System.Windows.Media;
 
 namespace NeeView
@@ -389,12 +391,24 @@ private void OnRendering(object? sender, EventArgs e)
             LayoutFrame();
         }
 
-
-        // ウィンドウソース初期化後イベント
-        private void MainWindow_SourceInitialized(object sender, EventArgs e)
+        // ウィンドウソース初期化後
+        protected override void OnSourceInitialized(EventArgs e)
         {
+            base.OnSourceInitialized(e);
+
             Debug.WriteLine($"App.MainWindow.SourceInitialized: {App.Current.Stopwatch.ElapsedMilliseconds}ms");
 
+            if (App.Current.Resources["Window.Background"] is SolidColorBrush brush)
+            {
+                // Win32 の背景ブラシを設定して起動時のちらつきを軽減するテスト
+                var hwnd = new WindowInteropHelper(this).Handle;
+                int color = brush.Color.B << 16 | brush.Color.G << 8 | brush.Color.R;
+                IntPtr blackBrush = NativeMethods.CreateSolidBrush(color);
+                const int GCLP_HBRBACKGROUND = -10;
+                NativeMethods.SetClassLongPtr(hwnd, GCLP_HBRBACKGROUND, blackBrush);
+                NativeMethods.InvalidateRect(hwnd, IntPtr.Zero, true);
+            }
+
             // Chrome の情報を最新にする
             _windowController.Refresh();
 
@@ -405,13 +419,15 @@ private void MainWindow_SourceInitialized(object sender, EventArgs e)
             Debug.WriteLine($"App.MainWindow.SourceInitialized.Done: {App.Current.Stopwatch.ElapsedMilliseconds}ms");
         }
 
+        private void MainWindow_SourceInitialized(object sender, EventArgs e)
+        {
+        }
+
         // ウィンドウ表示開始
         private void MainWindow_Loaded(object sender, RoutedEventArgs e)
         {
             Debug.WriteLine($"App.MainWindow.Loaded: {App.Current.Stopwatch.ElapsedMilliseconds}ms");
 
-            App.Current.CloseSplashScreen();
-
             MessageDialog.OwnerWindow = this;
 
             _dpiProvider.SetDipScale(VisualTreeHelper.GetDpi(this));

NeeView/NeeView/Interop/Gid32.cs

@@ -1,15 +1,14 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NeeView.Interop
 {
     internal static partial class NativeMethods
     {
         [DllImport("gdi32.dll")]
         internal static extern bool DeleteObject(IntPtr hObject);
+
+        [DllImport("gdi32.dll")]
+        internal static extern IntPtr CreateSolidBrush(int color);
     }
 }

NeeView/NeeView/Interop/User32.cs

@@ -152,5 +152,11 @@ internal static partial class NativeMethods
 
         [DllImport("user32", SetLastError = true, CharSet = CharSet.Auto)]
         internal extern static void RemoveClipboardFormatListener(nint hwnd);
+
+        [DllImport("user32", EntryPoint = "SetClassLongPtr")]
+        internal static extern IntPtr SetClassLongPtr(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
+
+        [DllImport("user32")]
+        internal static extern bool InvalidateRect(IntPtr hWnd, IntPtr rect, bool erase);
     }
 }