protected void StartInteractiveTransition(IUIViewControllerContextTransitioning transitionCtx)
{
SlidingViewController sliding = this.SlidingViewController;
UIViewController topController = sliding.GetViewControllerForKey(ECSlidingViewController.ECTransitionContextTopViewControllerKey);
// Disable user interaction of top controller's view
topController.View.UserInteractionEnabled = false;
if (_interactive)
{
UIViewController underController = sliding.GetViewControllerForKey(ECSlidingViewController.ECTransitionContextUnderLeftControllerKey);
RectangleF underViewInitialFrame = sliding.GetInitialFrameForViewController(underController);
RectangleF underViewFinalFrame = sliding.GetFinalFrameForViewController(underController);
// Update frame of under controller view
underController.View.Frame = underViewInitialFrame.IsEmpty ? underViewFinalFrame : underViewInitialFrame;
// Insert under view below top view
sliding.ContainerView.InsertSubviewBelow(underController.View, topController.View);
// Do some calculation
float finalLeftEdge = sliding.GetFinalFrameForViewController(topController).GetMinX();
float initialLeftEdge = sliding.GetInitialFrameForViewController(topController).GetMinX();
_fullWidth = Math.Abs(finalLeftEdge - initialLeftEdge);
_positiveLeftToRight = initialLeftEdge < finalLeftEdge;
}
else
{
this.AnimationController.AnimateTransition(transitionCtx);
}
// Enable user interaction of top controller's view
topController.View.UserInteractionEnabled = true;
}
internal void PanChanged(SlidingViewController slidingController, UIView topView, float translationX, float velocityX)
{
if (!_interactive)
{
return;
}
RectangleF initialFrame = _initialTopViewFrame;
float newLeftEdge = initialFrame.X + translationX;
// Calculate left edge
if (newLeftEdge < 0)
{
newLeftEdge = 0;
}
else if (newLeftEdge > slidingController.AnchorRightRevealAmount)
{
newLeftEdge = slidingController.AnchorRightRevealAmount;
}
// Update top view frame
initialFrame.X = newLeftEdge;
topView.Frame = initialFrame;
// Update transition
float percentComplete = ((!_positiveLeftToRight ? translationX * -1f : translationX) / _fullWidth);
percentComplete = percentComplete < 0 ? 0 : percentComplete;
percentComplete = percentComplete > 100 ? 100 : percentComplete;
slidingController.UpdateInteractiveTransition(percentComplete);
}
internal void PanBegan(SlidingViewController slidingController, UIView topView, float translationX, float velocityX)
{
bool movingRight = velocityX > 0;
_initialTopViewFrame = ((CALayer)topView.Layer.PresentationLayer).Frame;
_interactive = true;
ECSlidingViewControllerTopViewPosition pos = slidingController.CurrentTopViewPosition;
// Move sliding panel
if (ECSlidingViewControllerTopViewPosition.Centered == pos && slidingController.UnderLeftViewController != null && movingRight)
{
slidingController.AnchorTopViewToRightAnimated(true);
}
else if (ECSlidingViewControllerTopViewPosition.Centered == pos && slidingController.UnderRightViewController != null && !movingRight)
{
slidingController.AnchorTopViewToLeftAnimated(true);
}
else if (ECSlidingViewControllerTopViewPosition.AnchoredLeft == pos || ECSlidingViewControllerTopViewPosition.AnchoredRight == pos)
{
slidingController.ResetTopViewAnimated(true);
}
else
{
_interactive = false;
}
}
internal void PanEnded(SlidingViewController slidingController, UIView topView, float translationX, float velocityX)
{
if (!_interactive)
{
return;
}
_panningRight = velocityX > 0;
_interactive = false;
// Update gravity direction
this.Gravity.GravityDirection = _panningRight ? new CGVector(2f, 0f) : new CGVector(-2f, 0f);
// Update push behavior
this.Push.Angle = 0;
this.Push.Magnitude = velocityX;
this.Push.Active = true;
// Add composite behavior
this.Animator.AddBehavior(this.Composite);
}
internal void PanEnded(SlidingViewController slidingController, UIView topView, float translationX, float velocityX)
{
if (!_interactive) return;
_panningRight = velocityX > 0;
_interactive = false;
// Update gravity direction
this.Gravity.GravityDirection = _panningRight ? new CGVector(2f, 0f) : new CGVector(-2f, 0f);
// Update push behavior
this.Push.Angle = 0;
this.Push.Magnitude = velocityX;
this.Push.Active = true;
// Add composite behavior
this.Animator.AddBehavior(this.Composite);
}
internal void PanChanged(SlidingViewController slidingController, UIView topView, float translationX, float velocityX)
{
if (!_interactive) return;
RectangleF initialFrame = _initialTopViewFrame;
float newLeftEdge = initialFrame.X + translationX;
// Calculate left edge
if (newLeftEdge < 0)
{
newLeftEdge = 0;
}
else if (newLeftEdge > slidingController.AnchorRightRevealAmount)
{
newLeftEdge = slidingController.AnchorRightRevealAmount;
}
// Update top view frame
initialFrame.X = newLeftEdge;
topView.Frame = initialFrame;
// Update transition
float percentComplete = ((!_positiveLeftToRight ? translationX * -1f : translationX) / _fullWidth);
percentComplete = percentComplete < 0 ? 0 : percentComplete;
percentComplete = percentComplete > 100 ? 100 : percentComplete;
slidingController.UpdateInteractiveTransition(percentComplete);
}
internal void PanBegan(SlidingViewController slidingController, UIView topView, float translationX, float velocityX)
{
bool movingRight = velocityX > 0;
_initialTopViewFrame = ((CALayer)topView.Layer.PresentationLayer).Frame;
_interactive = true;
ECSlidingViewControllerTopViewPosition pos = slidingController.CurrentTopViewPosition;
// Move sliding panel
if (ECSlidingViewControllerTopViewPosition.Centered == pos && slidingController.UnderLeftViewController != null && movingRight)
{
slidingController.AnchorTopViewToRightAnimated (true);
}
else if (ECSlidingViewControllerTopViewPosition.Centered == pos && slidingController.UnderRightViewController != null && !movingRight)
{
slidingController.AnchorTopViewToLeftAnimated (true);
}
else if (ECSlidingViewControllerTopViewPosition.AnchoredLeft == pos || ECSlidingViewControllerTopViewPosition.AnchoredRight == pos)
{
slidingController.ResetTopViewAnimated(true);
}
else
{
_interactive = false;
}
}
public override void AnimateTransition(IUIViewControllerContextTransitioning transitionCtx)
{
SlidingViewController sliding = this.SlidingViewController;
// Get constant from uikit
IntPtr handle = Dlfcn.dlopen(MonoTouch.Constants.UIKitLibrary, 0);
NSString UITransitionContextToViewControllerKey = Dlfcn.GetStringConstant(handle, "UITransitionContextToViewControllerKey");
Dlfcn.dlclose(handle);
// Get controllers
UIViewController topController = sliding.GetViewControllerForKey(ECSlidingViewController.ECTransitionContextTopViewControllerKey);
UIViewController toController = sliding.GetViewControllerForKey(UITransitionContextToViewControllerKey);
RectangleF topViewInitialFrame = sliding.GetInitialFrameForViewController(topController);
RectangleF topViewFinalFrame = sliding.GetFinalFrameForViewController(topController);
// Update top view frame
topController.View.Frame = topViewInitialFrame;
// Reset layer transforms
CATransform3D transform = CATransform3D.Identity;
transform.m34 = -0.002f;
sliding.ContainerView.Layer.SublayerTransform = transform;
UIViewController underController;
float revealWidth = 0f;
bool resetting = false;
if (topController == toController)
{
underController = sliding.GetViewControllerForKey(ECSlidingViewController.ECTransitionContextUnderLeftControllerKey);
revealWidth = sliding.GetInitialFrameForViewController(topController).X;
resetting = true;
}
else
{
underController = sliding.GetViewControllerForKey(UITransitionContextToViewControllerKey);
revealWidth = sliding.GetFinalFrameForViewController(topController).X;
resetting = false;
}
RectangleF underViewInitialFrame = sliding.GetInitialFrameForViewController(underController);
RectangleF underViewFinalFrame = sliding.GetFinalFrameForViewController(underController);
underController.View.Frame = underViewInitialFrame.IsEmpty ? underViewFinalFrame : underViewInitialFrame;
underController.View.RemoveFromSuperview();
float underViewHalfwayPoint = revealWidth / 2;
RectangleF leftSideFrame = new RectangleF(0, 0, underViewHalfwayPoint, underController.View.Bounds.Height);
RectangleF rightSideFrame = new RectangleF(underViewHalfwayPoint, 0, underViewHalfwayPoint, underController.View.Bounds.Height);
UIView leftSideView = underController.View.ResizableSnapshotView(leftSideFrame, true, UIEdgeInsets.Zero);
UIView rightSideView = underController.View.ResizableSnapshotView(rightSideFrame, true, UIEdgeInsets.Zero);
leftSideView.Layer.AnchorPoint = new PointF(0f, 0.5f);
leftSideView.Frame = leftSideFrame;
rightSideView.Layer.Frame = rightSideFrame;
rightSideView.Layer.AnchorPoint = new PointF(1F, 0F);
if (resetting)
{
this.UnfoldLayers(leftSideView.Layer, rightSideView.Layer);
}
else
{
this.FoldLayers(leftSideView.Layer, rightSideView.Layer);
}
sliding.ContainerView.Layer.InsertSublayerBelow(leftSideView.Layer, topController.View.Layer);
sliding.ContainerView.Layer.InsertSublayerBelow(rightSideView.Layer, topController.View.Layer);
// Animate panel
UIView.Animate(
this.TransitionDuration(transitionCtx),
new NSAction(
delegate()
{
UIView.SetAnimationCurve(UIViewAnimationCurve.Linear);
if (this.CoordinatorAnimations != null)
{
this.CoordinatorAnimations(transitionCtx);
}
topController.View.Frame = topViewFinalFrame;
if (resetting)
{
this.FoldLayers(leftSideView.Layer, rightSideView.Layer);
}
else
{
this.UnfoldLayers(leftSideView.Layer, rightSideView.Layer);
}
}
),
new NSAction(
delegate()
{
sliding.ContainerView.Layer.SublayerTransform = CATransform3D.Identity;
leftSideView.RemoveFromSuperview();
rightSideView.RemoveFromSuperview();
bool topViewReset = (resetting && !sliding.TransitionWasCancelled) || (!resetting && sliding.TransitionWasCancelled);
topController.View.Frame = sliding.TransitionWasCancelled ? sliding.GetInitialFrameForViewController(topController) : sliding.GetFinalFrameForViewController(topController);
if (topViewReset)
{
underController.View.RemoveFromSuperview();
}
else
{
underController.View.Frame = sliding.TransitionWasCancelled ? sliding.GetInitialFrameForViewController(underController) : sliding.GetFinalFrameForViewController(underController);
sliding.ContainerView.InsertSubviewBelow(underController.View, topController.View);
}
if (this.CoordinatorCompletion != null)
{
this.CoordinatorCompletion(transitionCtx);
}
sliding.CompleteTransition(true);
}
)
);
}