[GTK3] Use GTK window state management functions instead of GDK

src/Gtk/Avalonia.Gtk3/Interop/Native.cs

@@ -236,17 +236,17 @@ namespace Avalonia.Gtk3.Interop
             [UnmanagedFunctionPointer(CallingConvention.Cdecl), GtkImport(GtkDll.Gdk)]
             public delegate GdkWindowState gdk_window_get_state(IntPtr window);
 
-            [UnmanagedFunctionPointer(CallingConvention.Cdecl), GtkImport(GtkDll.Gdk)]
+            [UnmanagedFunctionPointer(CallingConvention.Cdecl), GtkImport(GtkDll.Gtk)]
-            public delegate void gdk_window_iconify(IntPtr window);
+            public delegate void gtk_window_iconify(GtkWindow window);
 
-            [UnmanagedFunctionPointer(CallingConvention.Cdecl), GtkImport(GtkDll.Gdk)]
+            [UnmanagedFunctionPointer(CallingConvention.Cdecl), GtkImport(GtkDll.Gtk)]
-            public delegate void gdk_window_deiconify(IntPtr window);
+            public delegate void gtk_window_deiconify(GtkWindow window);
 
-            [UnmanagedFunctionPointer(CallingConvention.Cdecl), GtkImport(GtkDll.Gdk)]
+            [UnmanagedFunctionPointer(CallingConvention.Cdecl), GtkImport(GtkDll.Gtk)]
-            public delegate void gdk_window_maximize(IntPtr window);
+            public delegate void gtk_window_maximize(GtkWindow window);
 
-            [UnmanagedFunctionPointer(CallingConvention.Cdecl), GtkImport(GtkDll.Gdk)]
+            [UnmanagedFunctionPointer(CallingConvention.Cdecl), GtkImport(GtkDll.Gtk)]
-            public delegate void gdk_window_unmaximize(IntPtr window);
+            public delegate void gtk_window_unmaximize(GtkWindow window);
 
             [UnmanagedFunctionPointer(CallingConvention.Cdecl), GtkImport(GtkDll.Gdk)]
             public delegate void gtk_window_set_geometry_hints(GtkWindow window, IntPtr geometry_widget, ref GdkGeometry geometry, GdkWindowHints geom_mask);
@@ -437,10 +437,10 @@ namespace Avalonia.Gtk3.Interop
         public static D.gdk_window_get_origin GdkWindowGetOrigin;
         public static D.gdk_window_get_pointer GdkWindowGetPointer;
         public static D.gdk_window_get_state GdkWindowGetState;
-        public static D.gdk_window_iconify GdkWindowIconify;
+        public static D.gtk_window_iconify GtkWindowIconify;
-        public static D.gdk_window_deiconify GdkWindowDeiconify;
+        public static D.gtk_window_deiconify GtkWindowDeiconify;
-        public static D.gdk_window_maximize GdkWindowMaximize;
+        public static D.gtk_window_maximize GtkWindowMaximize;
-        public static D.gdk_window_unmaximize GdkWindowUnmaximize;
+        public static D.gtk_window_unmaximize GtkWindowUnmaximize;
         public static D.gdk_window_begin_move_drag GdkWindowBeginMoveDrag;
         public static D.gdk_window_begin_resize_drag GdkWindowBeginResizeDrag;
         public static D.gdk_event_request_motions GdkEventRequestMotions;

src/Gtk/Avalonia.Gtk3/WindowImpl.cs

@@ -32,15 +32,14 @@ namespace Avalonia.Gtk3
             }
             set
             {
-                var w = Native.GtkWidgetGetWindow(GtkWidget);
                 if (value == WindowState.Minimized)
-                    Native.GdkWindowIconify(w);
+                    Native.GtkWindowIconify(GtkWidget);
                 else if (value == WindowState.Maximized)
-                    Native.GdkWindowMaximize(w);
+                    Native.GtkWindowMaximize(GtkWidget);
                 else
                 {
-                    Native.GdkWindowUnmaximize(w);
+                    Native.GtkWindowUnmaximize(GtkWidget);
-                    Native.GdkWindowDeiconify(w);
+                    Native.GtkWindowDeiconify(GtkWidget);
                 }
             }
         }