feature: remember main window position (#1315)

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/ViewModels/Launcher.cs

@@ -118,13 +118,8 @@ public Launcher(string startupRepo)
                 UpdateTitle();
         }
 
-        public void Quit(double width, double height)
+        public void Quit()
         {
-            var pref = Preferences.Instance;
-            pref.Layout.LauncherWidth = width;
-            pref.Layout.LauncherHeight = height;
-            pref.Save();
-
             _ignoreIndexChange = true;
 
             foreach (var one in Pages)

src/ViewModels/LayoutInfo.cs

@@ -1,5 +1,4 @@
 using Avalonia.Controls;
-
 using CommunityToolkit.Mvvm.ComponentModel;
 
 namespace SourceGit.ViewModels
@@ -18,6 +17,18 @@ public double LauncherHeight
             set;
         } = 720;
 
+        public int LauncherPositionX
+        {
+            get;
+            set;
+        } = int.MinValue;
+
+        public int LauncherPositionY
+        {
+            get;
+            set;
+        } = int.MinValue;
+
         public WindowState LauncherWindowState
         {
             get;

src/Views/Launcher.axaml

@@ -11,8 +11,7 @@
                     x:Name="ThisControl"
                     Icon="/App.ico"
                     Title="{Binding Title}"
-                    MinWidth="1024" MinHeight="600"
-                    WindowStartupLocation="CenterScreen">
+                    MinWidth="1024" MinHeight="600">
   <Grid>
     <Grid.RowDefinitions>
       <RowDefinition Height="{Binding #ThisControl.CaptionHeight}"/>

src/Views/Launcher.axaml.cs

@@ -42,13 +42,6 @@ public bool HasRightCaptionButton
 
         public Launcher()
         {
-            var layout = ViewModels.Preferences.Instance.Layout;
-            if (layout.LauncherWindowState != WindowState.Maximized)
-            {
-                Width = layout.LauncherWidth;
-                Height = layout.LauncherHeight;
-            }
-
             if (OperatingSystem.IsMacOS())
             {
                 HasLeftCaptionButton = true;
@@ -65,6 +58,31 @@ public Launcher()
             }
 
             InitializeComponent();
+            PositionChanged += OnPositionChanged;
+
+            var layout = ViewModels.Preferences.Instance.Layout;
+            Width = layout.LauncherWidth;
+            Height = layout.LauncherHeight;
+
+            var x = layout.LauncherPositionX;
+            var y = layout.LauncherPositionY;
+            if (x != int.MinValue && y != int.MinValue && Screens is { } screens)
+            {
+                var position = new PixelPoint(x, y);
+                var size = new PixelSize((int)layout.LauncherWidth, (int)layout.LauncherHeight);
+                var desiredRect = new PixelRect(position, size);
+                for (var i = 0; i < screens.ScreenCount; i++)
+                {
+                    var screen = screens.All[i];
+                    if (screen.WorkingArea.Contains(desiredRect))
+                    {
+                        Position = position;
+                        return;
+                    }
+                }
+            }
+
+            WindowStartupLocation = WindowStartupLocation.CenterScreen;
         }
 
         public void BringToTop()
@@ -113,6 +131,18 @@ protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs chang
             }
         }
 
+        protected override void OnSizeChanged(SizeChangedEventArgs e)
+        {
+            base.OnSizeChanged(e);
+
+            if (WindowState == WindowState.Normal)
+            {
+                var layout = ViewModels.Preferences.Instance.Layout;
+                layout.LauncherWidth = Width;
+                layout.LauncherHeight = Height;
+            }
+        }
+
         protected override void OnKeyDown(KeyEventArgs e)
         {
             var vm = DataContext as ViewModels.Launcher;
@@ -311,7 +341,20 @@ protected override void OnClosing(WindowClosingEventArgs e)
             base.OnClosing(e);
 
             if (!Design.IsDesignMode && DataContext is ViewModels.Launcher launcher)
-                launcher.Quit(Width, Height);
+            {
+                ViewModels.Preferences.Instance.Save();
+                launcher.Quit();
+            }
+        }
+
+        private void OnPositionChanged(object sender, PixelPointEventArgs e)
+        {
+            if (WindowState == WindowState.Normal)
+            {
+                var layout = ViewModels.Preferences.Instance.Layout;
+                layout.LauncherPositionX = Position.X;
+                layout.LauncherPositionY = Position.Y;
+            }
         }
 
         private void OnOpenWorkspaceMenu(object sender, RoutedEventArgs e)