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src/Xfx.Controls.Droid/Forms.Internals/GestureManager.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,177 @@ | ||
| using System; | ||
| using System.ComponentModel; | ||
| using System.Linq; | ||
| using Android.Support.V4.View; | ||
| using Android.Views; | ||
| using Xamarin.Forms; | ||
| using Xamarin.Forms.Platform.Android; | ||
| using View = Xamarin.Forms.View; | ||
|
|
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| namespace Xfx.Controls.Droid.Forms.Internals | ||
| { | ||
| internal class GestureManager : IDisposable | ||
| { | ||
| IVisualElementRenderer _renderer; | ||
| readonly Lazy<GestureDetector> _tapAndPanDetector; | ||
| readonly Lazy<ScaleGestureDetector> _scaleDetector; | ||
|
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| bool _disposed; | ||
| bool _inputTransparent; | ||
| bool _isEnabled; | ||
|
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| VisualElement Element => _renderer?.Element; | ||
|
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| View View => _renderer?.Element as View; | ||
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| global::Android.Views.View Control => _renderer?.View; | ||
|
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| public GestureManager(IVisualElementRenderer renderer) | ||
| { | ||
| _renderer = renderer; | ||
| _renderer.ElementChanged += OnElementChanged; | ||
|
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| _tapAndPanDetector = new Lazy<GestureDetector>(InitializeTapAndPanDetector); | ||
| _scaleDetector = new Lazy<ScaleGestureDetector>(InitializeScaleDetector); | ||
| } | ||
|
|
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| public bool OnTouchEvent(MotionEvent e) | ||
| { | ||
| if (Control == null) | ||
| { | ||
| return false; | ||
| } | ||
|
|
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| if (!_isEnabled || _inputTransparent) | ||
| { | ||
| return false; | ||
| } | ||
|
|
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| if (!DetectorsValid()) | ||
| { | ||
| return false; | ||
| } | ||
|
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| var eventConsumed = false; | ||
| if (ViewHasPinchGestures()) | ||
| { | ||
| eventConsumed = _scaleDetector.Value.OnTouchEvent(e); | ||
| } | ||
|
|
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| eventConsumed = _tapAndPanDetector.Value.OnTouchEvent(e) || eventConsumed; | ||
|
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| return eventConsumed; | ||
| } | ||
|
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| public void Dispose() | ||
| { | ||
| Dispose(true); | ||
| GC.SuppressFinalize(this); | ||
| } | ||
|
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| bool DetectorsValid() | ||
| { | ||
| // Make sure we're not testing for gestures on old motion events after our | ||
| // detectors have already been disposed | ||
|
|
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| if (_scaleDetector.IsValueCreated && _scaleDetector.Value.Handle == IntPtr.Zero) | ||
| { | ||
| return false; | ||
| } | ||
|
|
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| if (_tapAndPanDetector.IsValueCreated && _tapAndPanDetector.Value.Handle == IntPtr.Zero) | ||
| { | ||
| return false; | ||
| } | ||
|
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| return true; | ||
| } | ||
|
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| GestureDetector InitializeTapAndPanDetector() | ||
| { | ||
| var context = Control.Context; | ||
| var listener = new InnerGestureListener(new TapGestureHandler(() => View), | ||
| new PanGestureHandler(() => View, context.FromPixels)); | ||
|
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| return new GestureDetector(context, listener); | ||
| } | ||
|
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| ScaleGestureDetector InitializeScaleDetector() | ||
| { | ||
| var context = Control.Context; | ||
| var listener = new InnerScaleListener(new PinchGestureHandler(() => View), context.FromPixels); | ||
| var detector = new ScaleGestureDetector(context, listener, Control.Handler); | ||
| ScaleGestureDetectorCompat.SetQuickScaleEnabled(detector, true); | ||
|
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| return detector; | ||
| } | ||
|
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| bool ViewHasPinchGestures() | ||
| { | ||
| return View != null && View.GestureRecognizers.OfType<PinchGestureRecognizer>().Any(); | ||
| } | ||
|
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| void OnElementChanged(object sender, VisualElementChangedEventArgs e) | ||
| { | ||
| if (e.OldElement != null) | ||
| { | ||
| e.OldElement.PropertyChanged -= OnElementPropertyChanged; | ||
| } | ||
|
|
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| if (e.NewElement != null) | ||
| { | ||
| e.NewElement.PropertyChanged += OnElementPropertyChanged; | ||
| } | ||
|
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| UpdateInputTransparent(); | ||
| UpdateIsEnabled(); | ||
| } | ||
|
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| void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e) | ||
| { | ||
| if (e.PropertyName == VisualElement.InputTransparentProperty.PropertyName) | ||
| UpdateInputTransparent(); | ||
| else if (e.PropertyName == VisualElement.IsEnabledProperty.PropertyName) | ||
| UpdateIsEnabled(); | ||
| } | ||
|
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| protected void Dispose(bool disposing) | ||
| { | ||
| if (_disposed) | ||
| { | ||
| return; | ||
| } | ||
|
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| _disposed = true; | ||
|
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| if (disposing) | ||
| { | ||
| if (Element != null) | ||
| { | ||
| Element.PropertyChanged -= OnElementPropertyChanged; | ||
| } | ||
|
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| _renderer = null; | ||
| } | ||
| } | ||
|
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| void UpdateInputTransparent() | ||
| { | ||
| if (Element == null) | ||
| { | ||
| return; | ||
| } | ||
|
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| _inputTransparent = Element.InputTransparent; | ||
| } | ||
|
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| void UpdateIsEnabled() | ||
| { | ||
| if (Element == null) | ||
| { | ||
| return; | ||
| } | ||
|
|
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| _isEnabled = Element.IsEnabled; | ||
| } | ||
| } | ||
| } |
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