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Diffstat (limited to 'Xamarin.Forms.Controls/ControlGalleryPages/PanGestureGalleryPage.cs')
-rw-r--r--Xamarin.Forms.Controls/ControlGalleryPages/PanGestureGalleryPage.cs96
1 files changed, 96 insertions, 0 deletions
diff --git a/Xamarin.Forms.Controls/ControlGalleryPages/PanGestureGalleryPage.cs b/Xamarin.Forms.Controls/ControlGalleryPages/PanGestureGalleryPage.cs
new file mode 100644
index 00000000..b37e8e48
--- /dev/null
+++ b/Xamarin.Forms.Controls/ControlGalleryPages/PanGestureGalleryPage.cs
@@ -0,0 +1,96 @@
+´╗┐using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Xamarin.Forms.Controls
+{
+ public class PanGestureGalleryPage : ContentPage
+ {
+ public class PanContainer : ContentView
+ {
+ public PanContainer ()
+ {
+ var pan = new PanGestureRecognizer
+ {
+ TouchPoints = 1
+ };
+
+ pan.PanUpdated += (object s, PanUpdatedEventArgs e) =>
+ {
+ switch (e.StatusType) {
+
+ case GestureStatus.Started: break;
+
+ case GestureStatus.Running:
+ Content.TranslationX = e.TotalX;
+ Content.TranslationY = e.TotalY;
+ break;
+
+ default:
+ Content.TranslationX = Content.TranslationY = 0;
+ break;
+ }
+ };
+
+ var pinch = new PinchGestureRecognizer ();
+
+ double xOffset = 0;
+ double yOffset = 0;
+ double startScale = 1;
+
+ pinch.PinchUpdated += (sender, e) =>
+ {
+
+ if (e.Status == GestureStatus.Started) {
+ startScale = Content.Scale;
+ Content.AnchorX = Content.AnchorY = 0;
+ }
+ if (e.Status == GestureStatus.Running) {
+
+ _currentScale += (e.Scale - 1) * startScale;
+ _currentScale = Math.Max (1, _currentScale);
+
+ var renderedX = Content.X + xOffset;
+ var deltaX = renderedX / Width;
+ var deltaWidth = Width / (Content.Width * startScale);
+ var originX = (e.ScaleOrigin.X - deltaX) * deltaWidth;
+
+ var renderedY = Content.Y + yOffset;
+ var deltaY = renderedY / Height;
+ var deltaHeight = Height / (Content.Height * startScale);
+ var originY = (e.ScaleOrigin.Y - deltaY) * deltaHeight;
+
+ double targetX = xOffset - (originX * Content.Width) * (_currentScale - startScale);
+ double targetY = yOffset - (originY * Content.Height) * (_currentScale - startScale);
+
+ Content.TranslationX = targetX.Clamp (-Content.Width * (_currentScale - 1), 0);
+ Content.TranslationY = targetY.Clamp (-Content.Height * (_currentScale - 1), 0);
+
+ Content.Scale = _currentScale;
+ }
+ if (e.Status == GestureStatus.Completed) {
+ xOffset = Content.TranslationX;
+ yOffset = Content.TranslationY;
+ }
+ };
+
+ GestureRecognizers.Add (pinch);
+
+ GestureRecognizers.Add (pan);
+ }
+
+ double _currentScale = 1;
+ }
+
+ public PanGestureGalleryPage ()
+ {
+ var image = new Image { Source = "http://placehold.it/2000x2000", BackgroundColor = Color.Gray, WidthRequest = 2000, HeightRequest = 2000, VerticalOptions = LayoutOptions.Center, HorizontalOptions = LayoutOptions.Center };
+
+ var panme = new PanContainer { Content = image };
+
+ Content = new StackLayout { Children = { new Label { Text = "Use two fingers to pinch. Use one finger to pan." }, panme }, Padding = new Thickness (20) };
+ }
+ }
+} \ No newline at end of file