void LayoutSidebar(bool animate)
{
if (_gestureActive)
{
return;
}
if (animate)
{
UIView.BeginAnimations(FlyoutAnimationName);
}
FlyoutTransition.LayoutViews(View.Bounds, IsOpen ? 1 : 0, Flyout.ViewController.View, Detail.View, _flyoutBehavior);
if (animate)
{
UIView.SetAnimationCurve(AnimationCurve);
UIView.SetAnimationDuration(AnimationDuration);
UIView.CommitAnimations();
View.LayoutIfNeeded();
}
if (IsOpen && _flyoutBehavior == FlyoutBehavior.Flyout)
{
AddTapoffView();
}
else
{
RemoveTapoffView();
}
}
void HandlePanGesture(UIPanGestureRecognizer pan)
{
var translation = pan.TranslationInView(View).X;
double openProgress = 0;
double openLimit = Flyout.ViewController.View.Frame.Width;
if (IsOpen)
{
openProgress = 1 - (-translation / openLimit);
}
else
{
openProgress = translation / openLimit;
}
openProgress = Math.Min(Math.Max(openProgress, 0.0), 1.0);
var openPixels = openLimit * openProgress;
switch (pan.State)
{
case UIGestureRecognizerState.Changed:
_gestureActive = true;
if (TapoffView == null)
{
AddTapoffView();
}
if (_flyoutAnimation != null)
{
TapoffView.Layer.RemoveAllAnimations();
_flyoutAnimation?.StopAnimation(true);
_flyoutAnimation = null;
}
TapoffView.Layer.Opacity = (float)openProgress;
FlyoutTransition.LayoutViews(View.Bounds, (nfloat)openProgress, Flyout.ViewController.View, Detail.View, _flyoutBehavior);
break;
case UIGestureRecognizerState.Ended:
_gestureActive = false;
if (IsOpen)
{
if (openProgress < .8)
{
IsOpen = false;
}
}
else
{
if (openProgress > 0.2)
{
IsOpen = true;
}
}
LayoutSidebar(true);
break;
}
}
void LayoutSidebar(bool animate)
{
if (_gestureActive)
{
return;
}
if (animate && _flyoutAnimation != null)
{
return;
}
if (!animate && _flyoutAnimation != null)
{
_flyoutAnimation.StopAnimation(true);
_flyoutAnimation = null;
}
if (Forms.IsiOS10OrNewer)
{
if (IsOpen)
{
UpdateTapoffView();
}
if (animate && TapoffView != null)
{
var tapOffViewAnimation = CABasicAnimation.FromKeyPath(@"opacity");
tapOffViewAnimation.BeginTime = 0;
tapOffViewAnimation.Duration = AnimationDurationInSeconds;
tapOffViewAnimation.SetFrom(NSNumber.FromFloat(TapoffView.Layer.Opacity));
tapOffViewAnimation.SetTo(NSNumber.FromFloat(IsOpen ? 1 : 0));
tapOffViewAnimation.FillMode = CAFillMode.Forwards;
tapOffViewAnimation.RemovedOnCompletion = false;
_flyoutAnimation = new UIViewPropertyAnimator(AnimationDurationInSeconds, UIViewAnimationCurve.EaseOut, () =>
{
FlyoutTransition.LayoutViews(View.Bounds, IsOpen ? 1 : 0, Flyout.ViewController.View, Detail.View, _flyoutBehavior);
if (TapoffView != null)
{
TapoffView.Layer.AddAnimation(tapOffViewAnimation, "opacity");
}
});
_flyoutAnimation.AddCompletion((p) =>
{
if (p == UIViewAnimatingPosition.End)
{
if (TapoffView != null)
{
TapoffView.Layer.Opacity = IsOpen ? 1 : 0;
TapoffView.Layer.RemoveAllAnimations();
}
UpdateTapoffView();
_flyoutAnimation = null;
}
});
_flyoutAnimation.StartAnimation();
View.LayoutIfNeeded();
}
else if (_flyoutAnimation == null)
{
FlyoutTransition.LayoutViews(View.Bounds, IsOpen ? 1 : 0, Flyout.ViewController.View, Detail.View, _flyoutBehavior);
UpdateTapoffView();
if (TapoffView != null)
{
TapoffView.Layer.Opacity = IsOpen ? 1 : 0;
}
}
}
else
{
if (animate)
{
UIView.BeginAnimations(FlyoutAnimationName);
}
FlyoutTransition.LayoutViews(View.Bounds, IsOpen ? 1 : 0, Flyout.ViewController.View, Detail.View, _flyoutBehavior);
if (animate)
{
UIView.SetAnimationCurve(AnimationCurve);
UIView.SetAnimationDuration(AnimationDurationInSeconds);
UIView.CommitAnimations();
View.LayoutIfNeeded();
}
UpdateTapoffView();
}
void UpdateTapoffView()
{
if (IsOpen && _flyoutBehavior == FlyoutBehavior.Flyout)
{
AddTapoffView();
}
else
{
RemoveTapoffView();
}
}
}
