[GTK] Add support for ClickGestureRecognizer (#3971)

* [GTK] Add support for ClickGestureRecognizer

* Add ClickGestureGalleryPage to test ClickGestureRecognizer

Xamarin.Forms.Controls/ControlGalleryPages/ClickGestureGalleryPage.cs

@@ -0,0 +1,121 @@
+using System;
+
+namespace Xamarin.Forms.Controls
+{
+	public class ClickGestureGalleryPage : ContentPage
+	{
+		Command clickCommand;
+		BoxView changeColorBoxView;
+
+		public ClickGestureGalleryPage()
+		{
+			clickCommand = new Command<Color>(HandleClickCommand);
+			var vertical = new StackLayout
+			{
+				VerticalOptions = LayoutOptions.Center,
+				HorizontalOptions = LayoutOptions.Center,
+				Spacing = 40
+			};
+
+			var horizontal = new StackLayout
+			{
+				Orientation = StackOrientation.Horizontal,
+				Spacing = 20,
+				HorizontalOptions = LayoutOptions.Center,
+				VerticalOptions = LayoutOptions.Center
+			};
+			vertical.Children.Add(horizontal);
+
+			var singleClickLabel = new Label
+			{
+				Text = "Click me!",
+				BackgroundColor = Color.PaleGreen
+			};
+			var singleClickGesture = new ClickGestureRecognizer
+			{
+				Command = clickCommand,
+				CommandParameter = Color.PaleGreen,
+				NumberOfClicksRequired = 1,
+				Buttons = ButtonsMask.Primary
+			};
+			singleClickLabel.GestureRecognizers.Add(singleClickGesture);
+			horizontal.Children.Add(singleClickLabel);
+
+			var doubleClickLabel = new Label
+			{
+				Text = "Double click me!!",
+				BackgroundColor = Color.Aqua
+			};
+			var doubleClickGesture = new ClickGestureRecognizer
+			{
+				Command = clickCommand,
+				CommandParameter = Color.Aqua,
+				NumberOfClicksRequired = 2,
+				Buttons = ButtonsMask.Primary
+			};
+			doubleClickLabel.GestureRecognizers.Add(doubleClickGesture);
+			horizontal.Children.Add(doubleClickLabel);
+
+			var tripleClicklabel = new Label
+			{
+				Text = "Triple click me!!!",
+				BackgroundColor = Color.Olive
+			};
+			var tripleClickGesture = new ClickGestureRecognizer
+			{
+				Command = clickCommand,
+				CommandParameter = Color.Olive,
+				NumberOfClicksRequired = 3,
+				Buttons = ButtonsMask.Primary
+			};
+			tripleClicklabel.GestureRecognizers.Add(tripleClickGesture);
+			horizontal.Children.Add(tripleClicklabel);
+
+			var rightClickLabel = new Label
+			{
+				Text = "Right click me¡",
+				BackgroundColor = Color.Coral
+			};
+			var rigthClickGesture = new ClickGestureRecognizer
+			{
+				Command = clickCommand,
+				CommandParameter = Color.Coral,
+				NumberOfClicksRequired = 1,
+				Buttons = ButtonsMask.Secondary
+			};
+			rightClickLabel.GestureRecognizers.Add(rigthClickGesture);
+			horizontal.Children.Add(rightClickLabel);
+
+			var doubleRightClickLabel = new Label
+			{
+				Text = "Double right click me¡¡",
+				BackgroundColor = Color.Gold
+			};
+			var doubleRigthClickGesture = new ClickGestureRecognizer
+			{
+				Command = clickCommand,
+				CommandParameter = Color.Gold,
+				NumberOfClicksRequired = 2,
+				Buttons = ButtonsMask.Secondary
+			};
+			doubleRightClickLabel.GestureRecognizers.Add(doubleRigthClickGesture);
+			horizontal.Children.Add(doubleRightClickLabel);
+
+
+			changeColorBoxView = new BoxView
+			{
+				VerticalOptions = LayoutOptions.CenterAndExpand,
+				HorizontalOptions = LayoutOptions.CenterAndExpand,
+				WidthRequest = 200,
+				HeightRequest = 50
+			};
+			vertical.Children.Add(changeColorBoxView);
+			Content = vertical;
+		}
+
+		void HandleClickCommand(Color backgroundColor)
+		{
+			changeColorBoxView.BackgroundColor = backgroundColor;
+		}
+	}
+}

Xamarin.Forms.Controls/CoreGallery.cs

@@ -287,6 +287,7 @@ namespace Xamarin.Forms.Controls
 				new GalleryPageFactory(() => new PanGestureGalleryPage(), "Pan gesture Gallery"),
 				new GalleryPageFactory(() => new SwipeGestureGalleryPage(), "Swipe gesture Gallery"),
 				new GalleryPageFactory(() => new PinchGestureTestPage(), "Pinch gesture Gallery"),
+				new GalleryPageFactory(() => new ClickGestureGalleryPage(), "Click gesture Gallery"),
 				new GalleryPageFactory(() => new AutomationIdGallery(), "AutomationID Gallery"),
 				new GalleryPageFactory(() => new LayoutPerformanceGallery(), "Layout Perf Gallery"),
 				new GalleryPageFactory(() => new ListViewSelectionColor(), "ListView SelectionColor Gallery"),

Xamarin.Forms.Platform.GTK/VisualElementTracker.cs

@@ -244,7 +244,7 @@ namespace Xamarin.Forms.Platform.GTK
 
 			_container.ButtonPressEvent -= OnContainerButtonPressEvent;
 
-			if (gestures.GetGesturesFor<TapGestureRecognizer>(g => g.NumberOfTapsRequired == 1).Any())
+			if (gestures.GetGesturesFor<TapGestureRecognizer>().Any() || gestures.GetGesturesFor<ClickGestureRecognizer>().Any())
 			{
 				_container.ButtonPressEvent += OnContainerButtonPressEvent;
 			}
@@ -339,7 +339,8 @@ namespace Xamarin.Forms.Platform.GTK
 
 		private void OnContainerButtonPressEvent(object o, ButtonPressEventArgs args)
 		{
-			if (args.Event.Button != 1)
+			var button = args.Event.Button;
+			if (button != 1 && button != 3)
 			{
 				return;
 			}
@@ -349,21 +350,47 @@ namespace Xamarin.Forms.Platform.GTK
 			if (view == null)
 				return;
 
-			if (args.Event.Type == Gdk.EventType.TwoButtonPress)
+			int numClicks = 0;
+			switch (args.Event.Type)
 			{
-				IEnumerable<TapGestureRecognizer> doubleTapGestures = view.GestureRecognizers
-					.GetGesturesFor<TapGestureRecognizer>(g => g.NumberOfTapsRequired == 2);
-
-				foreach (TapGestureRecognizer recognizer in doubleTapGestures)
-					recognizer.SendTapped(view);
+				case Gdk.EventType.ThreeButtonPress:
+					numClicks = 3;
+					break;
+				case Gdk.EventType.TwoButtonPress:
+					numClicks = 2;
+					break;
+				case Gdk.EventType.ButtonPress:
+					numClicks = 1;
+					break;
+				default:
+					return;
 			}
-			else
+
+			// Taps or Clicks
+			if (button == 1)
 			{
 				IEnumerable<TapGestureRecognizer> tapGestures = view.GestureRecognizers
-					.GetGesturesFor<TapGestureRecognizer>(g => g.NumberOfTapsRequired == 1);
+					.GetGesturesFor<TapGestureRecognizer>(g => g.NumberOfTapsRequired == numClicks);
 
 				foreach (TapGestureRecognizer recognizer in tapGestures)
 					recognizer.SendTapped(view);
+
+				IEnumerable<ClickGestureRecognizer> clickGestures = view.GestureRecognizers
+					.GetGesturesFor<ClickGestureRecognizer>(g => g.NumberOfClicksRequired == numClicks &&
+															g.Buttons == ButtonsMask.Primary);
+
+				foreach (ClickGestureRecognizer recognizer in clickGestures)
+					recognizer.SendClicked(view, ButtonsMask.Primary);
+			}
+			else
+			{
+				// right click
+				IEnumerable<ClickGestureRecognizer> rightClickGestures = view.GestureRecognizers
+					.GetGesturesFor<ClickGestureRecognizer>(g => g.NumberOfClicksRequired == numClicks &&
+															g.Buttons == ButtonsMask.Secondary);
+
+				foreach (ClickGestureRecognizer recognizer in rightClickGestures)
+					recognizer.SendClicked(view, ButtonsMask.Secondary);
 			}
 		}