From acf11efb32ae7a3348a8bbbe13189639cdeeb90b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Javier=20Su=C3=A1rez?= <javiersuarezruiz@hotmail.com>
Date: Fri, 13 May 2022 12:30:52 +0200
Subject: [PATCH] Fix GraphicsView to support gestures on Windows (#7077)

---
 .../Pages/Others/GraphicsViewPage.xaml        | 20 +++++++++++++++++--
 .../Pages/Others/GraphicsViewPage.xaml.cs     | 18 +++++++++++++++++
 .../src/Core/HandlerImpl/GraphicsView.Impl.cs |  1 +
 .../Windows/PlatformTouchGraphicsView.cs      | 15 ++++----------
 4 files changed, 41 insertions(+), 13 deletions(-)

diff --git a/src/Controls/samples/Controls.Sample/Pages/Others/GraphicsViewPage.xaml b/src/Controls/samples/Controls.Sample/Pages/Others/GraphicsViewPage.xaml
index 8c150d9b9fb3..61e62346f0ae 100644
--- a/src/Controls/samples/Controls.Sample/Pages/Others/GraphicsViewPage.xaml
+++ b/src/Controls/samples/Controls.Sample/Pages/Others/GraphicsViewPage.xaml
@@ -18,7 +18,17 @@
                 Margin="12"
                 Text="Invalidate"
                 Clicked="OnButtonClicked"/>
-            <Label x:Name="labelInteractions" Margin="12" />
+            <StackLayout 
+                Margin="12">
+                <Label 
+                    Text="GraphicsView Interactions" />
+                <Label 
+                    x:Name="labelInteractions" />
+                <Label 
+                    Text="GraphicsView Gestures" />
+                <Label 
+                    x:Name="labelGestures" />
+            </StackLayout>
             <GraphicsView
                 x:Name="GraphicsView"
                 HeightRequest="500"
@@ -30,7 +40,13 @@
                 StartHoverInteraction="GraphicsView_StartHoverInteraction"
                 MoveHoverInteraction="GraphicsView_MoveHoverInteraction"
                 EndHoverInteraction="GraphicsView_EndHoverInteraction"
-                Drawable="{StaticResource GraphicsDrawable}"/>
+                Drawable="{StaticResource GraphicsDrawable}">
+                <GraphicsView.GestureRecognizers>
+                    <TapGestureRecognizer Tapped="GraphicsView_Tapped" />
+                    <PanGestureRecognizer PanUpdated="GraphicsView_PanUpdated" />
+                    <PinchGestureRecognizer PinchUpdated="GraphicsView_PinchUpdated" />
+                </GraphicsView.GestureRecognizers>
+            </GraphicsView>
         </StackLayout>
     </views:BasePage.Content>
 </views:BasePage>
\ No newline at end of file
diff --git a/src/Controls/samples/Controls.Sample/Pages/Others/GraphicsViewPage.xaml.cs b/src/Controls/samples/Controls.Sample/Pages/Others/GraphicsViewPage.xaml.cs
index 4842d04bc170..0ea198e07e0c 100644
--- a/src/Controls/samples/Controls.Sample/Pages/Others/GraphicsViewPage.xaml.cs
+++ b/src/Controls/samples/Controls.Sample/Pages/Others/GraphicsViewPage.xaml.cs
@@ -37,12 +37,30 @@ void GraphicsView_MoveHoverInteraction(object sender, TouchEventArgs e)
 		void GraphicsView_EndHoverInteraction(object sender, EventArgs e)
 			=> UpdateInteractions("End Hover");
 
+		void GraphicsView_Tapped(object sender, EventArgs args)
+			=> UpdateGestures("TapGestureRecognizer");
+
+		void GraphicsView_PanUpdated(object sender, PanUpdatedEventArgs args)
+			=> UpdateGestures("PanGestureRecognizer");
+
+		void GraphicsView_PinchUpdated(object sender, PinchGestureUpdatedEventArgs args)
+			=> UpdateGestures("PinchGestureRecognizer ");
+
 		void UpdateInteractions(string name, TouchEventArgs e)
 		{
 			Dispatcher.DispatchAsync(() =>
 				labelInteractions.Text = $"{name}: "
 					+ string.Join(", ", e.Touches.Select(t => $"[{Math.Round(t.X, 1)},{Math.Round(t.Y, 1)}]"))
 					+ $" IsInsideBounds: {e.IsInsideBounds}");
+			
+			Dispatcher.DispatchAsync(() =>
+				labelGestures.Text = string.Empty);
+		}
+
+		void UpdateGestures(string name)
+		{
+			Dispatcher.DispatchAsync(() =>	
+				labelGestures.Text = $"{name}");
 		}
 
 		void UpdateInteractions(string name)
diff --git a/src/Controls/src/Core/HandlerImpl/GraphicsView.Impl.cs b/src/Controls/src/Core/HandlerImpl/GraphicsView.Impl.cs
index fb5f2b649243..045b16ddc10f 100644
--- a/src/Controls/src/Core/HandlerImpl/GraphicsView.Impl.cs
+++ b/src/Controls/src/Core/HandlerImpl/GraphicsView.Impl.cs
@@ -34,6 +34,7 @@ public void Invalidate()
 		void IGraphicsView.EndHoverInteraction() => EndHoverInteraction?.Invoke(this, EventArgs.Empty);
 
 		void IGraphicsView.EndInteraction(PointF[] points, bool isInsideBounds) => EndInteraction?.Invoke(this, new TouchEventArgs(points, isInsideBounds));
+		
 		void IGraphicsView.StartHoverInteraction(PointF[] points) => StartHoverInteraction?.Invoke(this, new TouchEventArgs(points, true));
 
 		void IGraphicsView.MoveHoverInteraction(PointF[] points) => MoveHoverInteraction?.Invoke(this, new TouchEventArgs(points, true));
diff --git a/src/Core/src/Platform/Windows/PlatformTouchGraphicsView.cs b/src/Core/src/Platform/Windows/PlatformTouchGraphicsView.cs
index 97c9287faedd..b4d479e65472 100644
--- a/src/Core/src/Platform/Windows/PlatformTouchGraphicsView.cs
+++ b/src/Core/src/Platform/Windows/PlatformTouchGraphicsView.cs
@@ -1,7 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
-using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Controls;
 using Microsoft.Maui.Graphics.Win2D;
 using Microsoft.UI.Xaml.Input;
 using Microsoft.Maui.Graphics;
@@ -17,6 +14,8 @@ public class PlatformTouchGraphicsView : UserControl
 
 		public PlatformTouchGraphicsView()
 		{
+			ManipulationMode = ManipulationModes.All;
+
 			Content = _platformGraphicsView = new W2DGraphicsView();
 		}
 
@@ -36,15 +35,12 @@ PointF[] GetViewPoints(PointerRoutedEventArgs e)
 
 		protected override void OnPointerEntered(PointerRoutedEventArgs e)
 		{
-			e.Handled = true;
 			_isInBounds = true;
 			_graphicsView?.StartHoverInteraction(GetViewPoints(e));
 		}
 
 		protected override void OnPointerCanceled(PointerRoutedEventArgs e)
 		{
-			e.Handled = true;
-
 			if (_isTouching)
 			{
 				_isTouching = false;
@@ -55,7 +51,6 @@ protected override void OnPointerCanceled(PointerRoutedEventArgs e)
 
 		protected override void OnPointerExited(PointerRoutedEventArgs e)
 		{
-			e.Handled = true;
 			_isInBounds = false;
 
 			_graphicsView?.EndHoverInteraction();
@@ -69,7 +64,6 @@ protected override void OnPointerExited(PointerRoutedEventArgs e)
 
 		protected override void OnPointerMoved(PointerRoutedEventArgs e)
 		{
-			e.Handled = true;
 			var points = GetViewPoints(e);
 
 			_graphicsView?.MoveHoverInteraction(points);
@@ -80,7 +74,6 @@ protected override void OnPointerMoved(PointerRoutedEventArgs e)
 
 		protected override void OnPointerPressed(PointerRoutedEventArgs e)
 		{
-			e.Handled = true;
 			var points = GetViewPoints(e);
 			_isTouching = true;
 			_graphicsView?.StartInteraction(points);
@@ -102,4 +95,4 @@ protected override void OnPointerReleased(PointerRoutedEventArgs e)
 
 		public void Disconnect() => _graphicsView = null;
 	}
-}
+}
\ No newline at end of file