void PanGestureTriggered()
{
if (IsPanningLeft() && !IsRightMenuOpen() && !CanOpenLeftMenu())
{
return;
}
if (IsPanningRight() && !IsLeftMenuOpen() && !CanOpenRightMenu())
{
return;
}
if (PanGesture.State == UIGestureRecognizerState.Began)
{
contentViewControllerFrame = contentViewController.View.Frame;
leftMenuWasOpenAtPanBegin = IsLeftMenuOpen();
rightMenuWasOpenAtPanBegin = IsRightMenuOpen();
if (!leftMenuWasOpenAtPanBegin && IsPanningLeft() && !rightMenuWasOpenAtPanBegin && leftMenuViewController != null)
{
LoadLeftMenuViewControllerViewIfNeeded(); // Menu is closed, load it if needed
contentViewController.View.EndEditing(true); // Dismiss any open keyboards.
leftMenuViewController.BeginAppearanceTransition(true, true); // Menu is appearing
}
if (!rightMenuWasOpenAtPanBegin && IsPanningRight() && !leftMenuWasOpenAtPanBegin && rightMenuViewController != null)
{
LoadRightMenuViewControllerViewIfNeeded();
contentViewController.View.EndEditing(true);
rightMenuViewController.BeginAppearanceTransition(true, true);
}
if (IsPanningLeft() && !IsRightMenuOpen() && rightMenuViewController != null && rightMenuViewController.View.Superview != null)
{
rightMenuViewController.View.Hidden = true;
}
else if (IsPanningRight() && !IsLeftMenuOpen() && leftMenuViewController != null && leftMenuViewController.View.Superview != null)
{
leftMenuViewController.View.Hidden = true;
}
}
PointF translation = PanGesture.TranslationInView(PanGesture.View);
RectangleF frame = contentViewControllerFrame;
frame.X += translation.X;
float offsetXWhenMenuIsOpen = OffsetXWhenMenuIsOpen();
if (IsPanningLeft() && !rightMenuWasOpenAtPanBegin)
{
if (frame.X < 0)
{
frame.X = 0;
}
else if (frame.X > offsetXWhenMenuIsOpen)
{
frame.X = offsetXWhenMenuIsOpen;
}
}
else if (IsPanningRight() && !leftMenuWasOpenAtPanBegin)
{
if (frame.X > 0)
{
frame.X = 0;
}
else if (frame.X < offsetXWhenMenuIsOpen)
{
frame.X = offsetXWhenMenuIsOpen;
}
}
PanGesture.View.Frame = frame;
if (PanGesture.State == UIGestureRecognizerState.Ended)
{
PointF velocity = PanGesture.VelocityInView(PanGesture.View);
if (IsPanningLeft() && !rightMenuWasOpenAtPanBegin)
{
frame = LeftMenuOpen(velocity, frame, offsetXWhenMenuIsOpen);
}
else if (IsPanningLeft() && rightMenuWasOpenAtPanBegin)
{
frame = RightMenuClose(velocity, frame);
if (leftMenuViewController != null)
{
leftMenuViewController.View.Hidden = false;
}
}
else if (IsPanningRight() && !leftMenuWasOpenAtPanBegin)
{
frame = RightMenuOpen(velocity, frame, offsetXWhenMenuIsOpen);
}
else if (IsPanningRight() && leftMenuWasOpenAtPanBegin)
{
frame = LeftMenuClose(velocity, frame);
if (rightMenuViewController != null)
{
rightMenuViewController.View.Hidden = false;
}
}
contentViewControllerFrame = frame;
}
}
private bool IsPanningRight()
{
PointF velocity = PanGesture.VelocityInView(PanGesture.View);
return(velocity.X < 0);
}