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using System;
using NUnit.Framework;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Core.UnitTests
{
public class PinchGestureRecognizerTests : BaseTestFixture
{
[Test]
public void Constructor ()
{
var pinch = new PinchGestureRecognizer ();
}
[Test]
public void PinchStartedTest ()
{
var view = new View ();
var pinch = new PinchGestureRecognizer ();
GestureStatus result = GestureStatus.Canceled;
var point = new Point (10, 10);
var resultPoint = Point.Zero;
pinch.PinchUpdated += (object sender, PinchGestureUpdatedEventArgs e) => {
result = e.Status;
resultPoint = e.ScaleOrigin;
};
((IPinchGestureController)pinch).SendPinchStarted (view,point);
Assert.AreEqual (GestureStatus.Started, result);
Assert.AreEqual (point, resultPoint);
}
[Test]
public void PinchCompletedTest ()
{
var view = new View ();
var pinch = new PinchGestureRecognizer ();
GestureStatus result = GestureStatus.Canceled;
pinch.PinchUpdated += (object sender, PinchGestureUpdatedEventArgs e) => {
result = e.Status;
};
((IPinchGestureController)pinch).SendPinchEnded (view);
Assert.AreEqual (GestureStatus.Completed, result);
}
[Test]
public void PinchUpdatedTest ()
{
var view = new View ();
var pinch = new PinchGestureRecognizer ();
var point = new Point (10, 10);
var resultPoint = Point.Zero;
double result = -1;
pinch.PinchUpdated += (object sender, PinchGestureUpdatedEventArgs e) => {
result = e.Scale;
resultPoint = e.ScaleOrigin;
};
((IPinchGestureController)pinch).SendPinch (view, 2, point);
Assert.AreEqual (2, result);
}
[Test]
public void OnlyOnePinchGesturePerViewTest ()
{
var view = new View ();
view.GestureRecognizers.Add(new PinchGestureRecognizer ());
Assert.Throws<InvalidOperationException> (() => view.GestureRecognizers.Add (new PinchGestureRecognizer ()));
}
}
}
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