feat: add option to disable animation.

src/Ursa/Controls/OverlayShared/OverlayDialogHost.Dialog.cs

@@ -126,9 +126,12 @@ public partial class OverlayDialogHost
                 {
                     _modalCount--;
                     HasModal = _modalCount > 0;
+                    if (!IsAnimationDisabled)
+                    {
                         await _maskDisappearAnimation.RunAsync(layer.Mask);
                     }
                 }
+            }
             
             ResetZIndices();
         }
@@ -156,7 +159,10 @@ public partial class OverlayDialogHost
         SetToPosition(control);
         control.AddHandler(OverlayFeedbackElement.ClosedEvent, OnDialogControlClosing);
         control.AddHandler(DialogControlBase.LayerChangedEvent, OnDialogLayerChanged);
+        if (!IsAnimationDisabled)
+        {
             _maskAppearAnimation.RunAsync(mask);
+        }
         _modalCount++;
         HasModal = _modalCount > 0;
         control.IsClosed = false;

src/Ursa/Controls/OverlayShared/OverlayDialogHost.Drawer.cs

@@ -28,6 +28,12 @@ public partial class OverlayDialogHost
         SetDrawerPosition(control);
         control.AddHandler(OverlayFeedbackElement.ClosedEvent, OnDrawerControlClosing);
         var animation = CreateAnimation(control.Bounds.Size, control.Position, true);
+        if (IsAnimationDisabled)
+        {
+            ResetDrawerPosition(control, this.Bounds.Size);
+        }
+        else
+        {
             if (mask is null)
             {
                 await animation.RunAsync(control);
@@ -37,6 +43,7 @@ public partial class OverlayDialogHost
                 await Task.WhenAll(animation.RunAsync(control), _maskAppearAnimation.RunAsync(mask));
             }
         }
+    }
     
     internal async void AddModalDrawer(DrawerControlBase control)
     {
@@ -52,8 +59,15 @@ public partial class OverlayDialogHost
         HasModal = _modalCount > 0;
         control.AddHandler(OverlayFeedbackElement.ClosedEvent, OnDrawerControlClosing);
         var animation = CreateAnimation(control.Bounds.Size, control.Position);
+        if (IsAnimationDisabled)
+        {
+            ResetDrawerPosition(control, this.Bounds.Size);
+        }
+        else
+        {
             await Task.WhenAll(animation.RunAsync(control), _maskAppearAnimation.RunAsync(mask));
         }
+    }
 
     private void SetDrawerPosition(DrawerControlBase control)
     {
@@ -150,16 +164,21 @@ public partial class OverlayDialogHost
                 _modalCount--;
                 HasModal = _modalCount > 0;
                 layer.Mask.RemoveHandler(PointerPressedEvent, ClickMaskToCloseDialog);
+                if (!IsAnimationDisabled)
+                {
                     var disappearAnimation = CreateAnimation(control.Bounds.Size, control.Position, false);
                     await Task.WhenAll(disappearAnimation.RunAsync(control), _maskDisappearAnimation.RunAsync(layer.Mask));
+                }
                 Children.Remove(layer.Mask);
-                
             }
             else
+            {
+                if (!IsAnimationDisabled)
                 {
                     var disappearAnimation = CreateAnimation(control.Bounds.Size, control.Position, false);
                     await disappearAnimation.RunAsync(control);
                 }
+            }
             Children.Remove(control);
             ResetZIndices();
         }

src/Ursa/Controls/OverlayShared/OverlayDialogHost.Shared.cs

@@ -15,7 +15,7 @@ public partial class OverlayDialogHost: Canvas
     private static readonly Animation _maskAppearAnimation;
     private static readonly Animation _maskDisappearAnimation;
 
-    private readonly List<DialogPair> _layers = new List<DialogPair>();
+    private readonly List<DialogPair> _layers = new List<DialogPair>(10);
     
     private class DialogPair
     {
@@ -44,6 +44,8 @@ public partial class OverlayDialogHost: Canvas
         private set => SetAndRaise(HasModalProperty, ref _hasModal, value);
     }
 
+    public bool IsAnimationDisabled { get; set; }
+    
     static OverlayDialogHost()
     {
         ClipToBoundsProperty.OverrideDefaultValue<OverlayDialogHost>(true);