public void SetTranslationInView(Xamarin.Forms.Point translation, Xamarin.Forms.VisualElement view)
{
//NOT really supported in Android
//TODO take account of view
_currentTranslation = translation;
_currentPoint = translation;
_previousPoint = translation;
}
public static void CancelAllAnimations(this Xamarin.Forms.VisualElement view)
{
if (view == null)
{
throw new ArgumentNullException(@"view");
}
Xamarin.Forms.ViewExtensions.CancelAnimations(view);
}
public void SetElement(Xamarin.Forms.VisualElement element)
{
var contentView = new Xamarin.Forms.ContentView();
var renderer = Xamarin.Forms.Platform.Android.Platform.CreateRendererWithContext(contentView, Context);
var oldElement = this.element;
if (oldElement != null)
{
oldElement.SurfaceInvalidated -= Invalidate;
oldElement.FocusChangeRequested -= OnFocusChangeRequested;
oldElement.PropertyChanged -= OnElementPropertyChanged;
// clear all values
oldElement.Gesture?.Clear();
oldElement.OnUnbind();
SetOnTouchListener(null);
if (element.BackgroundColor != oldElement.BackgroundColor)
{
UpdateBackgroundColor();
}
}
var newElement = element as TElement;
this.element = newElement;
newElement.SurfaceInvalidated += Invalidate;
newElement.FocusChangeRequested += OnFocusChangeRequested;
UpdateFlowDirection();
UpdateIsEnabled();
// Ensure renderer for marker is set
UpdateMarker();
if (newElement.Background != null)
{
UpdateBackground();
}
element.PropertyChanged += OnElementPropertyChanged;
var gesture = newElement.Gesture;
if (gesture != null)
{
gesture.Clear();
gesture.OnInitialize(this);
SetOnTouchListener(gesture);
}
if (_tracker == null)
{
// Can't set up the tracker in the constructor because it access the Element (for now)
_tracker = new VisualElementTracker(this);
}
if (!string.IsNullOrEmpty(element.StyleId))
{
ContentDescription = element.StyleId;
}
Invalidate();
OnElementChanged(oldElement, newElement);
}
public void AddTouchMoveHandler(Xamarin.Forms.VisualElement xamarinVisual, EventHandler <TouchEventArgs> handler)
{
IVisualElementRenderer renderer = Platform.GetRenderer(xamarinVisual);
Panel panel = renderer as Panel;
panel.PointerMoved += this.Panel_PointerMoved;
TouchEventsHelper helper = GetOrCreateTouchEventsHelper(panel);
helper.touchMoveHandlers.Add(handler);
}
private void SetNativeView(Xamarin.Forms.VisualElement view)
{
var renderer = Platform.CreateRenderer(view);
renderer.NativeView.Frame = UIScreen.MainScreen.Bounds;
renderer.NativeView.AutoresizingMask = UIViewAutoresizing.All;
renderer.NativeView.ContentMode = UIViewContentMode.ScaleToFill;
renderer.Element.Layout(UIScreen.MainScreen.Bounds.ToRectangle());
Window.RootViewController.View.AddSubview(renderer.NativeView);
}
protected Xamarin.Forms.Point GetLocationInAncestorView(Xamarin.Forms.Point location, Xamarin.Forms.VisualElement view)
{
var targetViewRenderer = view.GetRenderer();
var targetView = targetViewRenderer.ViewGroup;
var parent = NativeView;
var returnPoint = location;
while (parent != null && parent != targetView)
{
returnPoint.X += parent.Left;
returnPoint.Y += parent.Top;
parent = NativeView.Parent as View;
}
return(returnPoint);
}
public virtual Xamarin.Forms.Point LocationOfTouch(int touchIndex, Xamarin.Forms.VisualElement view)
{
return(GetLocationInAncestorView(FirstTouchPoint, view));
}
public Xamarin.Forms.Point GetTranslationInView(Xamarin.Forms.VisualElement view)
{
//not supported like in iOS right now.
return(new Xamarin.Forms.Point(-_currentTranslation.X, -_currentTranslation.Y));
}
public Xamarin.Forms.Point GetVelocityInView(Xamarin.Forms.VisualElement view)
{
return(_velocity);
// throw new NotImplementedException ("need to write velocity");
}
public void SetTranslationInView(Xamarin.Forms.Point translation, Xamarin.Forms.VisualElement view)
{
//Experimental android support
_rawTranslation = translation;
}
public override Xamarin.Forms.Point LocationInView(Xamarin.Forms.VisualElement view)
{
return(GetLocationInAncestorView(_currentScreenPoint, view));
}
public Xamarin.Forms.Point GetTranslationInView(Xamarin.Forms.VisualElement view)
{
return(new Xamarin.Forms.Point(_rawTranslation.X, _rawTranslation.Y));
}
public Xamarin.Forms.Point GetVelocityInView(Xamarin.Forms.VisualElement view)
{
return(_velocity);
}
protected Xamarin.Forms.Point GetLocationInAncestorView(Xamarin.Forms.Point location, Xamarin.Forms.VisualElement view)
{
int[] nativeViewLocation = new int[2];
NativeView.GetLocationOnScreen(nativeViewLocation);
var nativeViewLocationOnScreen = new Xamarin.Forms.Point(nativeViewLocation [0], nativeViewLocation [1]);
var offsetLocation = new Xamarin.Forms.Point(location.X + nativeViewLocationOnScreen.X, location.Y + nativeViewLocationOnScreen.Y);
var targetViewRenderer = view.GetRenderer();
var targetView = targetViewRenderer.ViewGroup;
int[] targetViewLocation = new int[2];
targetView.GetLocationOnScreen(targetViewLocation);
var nativeViewScreenLocation = new Xamarin.Forms.Point(targetViewLocation [0], targetViewLocation [1]);
var returnPoint = offsetLocation;
returnPoint.X -= nativeViewScreenLocation.X;
returnPoint.Y -= nativeViewScreenLocation.Y;
Console.WriteLine("offsetLocation {0} nativeViewLocationOnScreen {1} returnPoint", offsetLocation, nativeViewLocationOnScreen);
Console.WriteLine("location {0} parentViewLoc {1} returnPoint {2}", location, nativeViewScreenLocation, returnPoint);
return(returnPoint);
}
