public void CloseDrawer()
{
TapGestureRecognizer.Enabled = false;
UIView.AnimateNotify(0.2, () => {
TopView.Frame = TopViewFrame;
}, (finished) => {
DrawerTransitioning?.Invoke(this, new DrawerTransitioningEventArgs(DrawerTransitioningState.Closed));
updateStatusBarAppearance();
});
}
public async Task <bool> CloseDrawerAsync()
{
TapGestureRecognizer.Enabled = false;
var finished = await UIView.AnimateNotifyAsync(0.2, () => {
TopView.Frame = TopViewFrame;
});
DrawerTransitioning?.Invoke(this, new DrawerTransitioningEventArgs(DrawerTransitioningState.Closed));
updateStatusBarAppearance();
return(finished);
}
void handleLtrPanGesture(UIPanGestureRecognizer pan)
{
switch (pan.State)
{
case UIGestureRecognizerState.Began:
pendingStatusBarAppearanceUpdate = true;
break;
case UIGestureRecognizerState.Changed:
var ltrCurrentTranslation = pan.TranslationInView(pan.View);
// if panning right-to-left ltrCurrentTranslation.X will be negative
// setting pan.Enabled to false causes this method to be called again with
// pan.State == Cancelled, so we'll reenable the gesture in Cancelled: case
if (ltrCurrentTranslation.X < 0)
{
pan.Enabled = false;
return;
}
// if panning up or down more than left-to-right, kill this gesture recognizer
// to allow only the TopViewControllers scrollview, tableview, etc. to scroll
if (NMath.Abs(ltrCurrentTranslation.Y) > ltrCurrentTranslation.X)
{
pan.Enabled = false;
return;
}
var frame = TopViewFrame;
frame.X += ltrCurrentTranslation.X;
TopView.Frame = frame;
if (pendingStatusBarAppearanceUpdate)
{
pendingStatusBarAppearanceUpdate = false;
DrawerTransitioning?.Invoke(this, new DrawerTransitioningEventArgs(DrawerTransitioningState.Transitioning));
updateStatusBarAppearance();
}
break;
case UIGestureRecognizerState.Ended:
case UIGestureRecognizerState.Cancelled:
pan.Enabled = true;
// the TopView's frame was never moved because the pan was the wrong direction
// or the pan was a vertical scroll, so no reason to do anything here
if (pendingStatusBarAppearanceUpdate)
{
pendingStatusBarAppearanceUpdate = false;
return;
}
// if the drawer has been opened at least 50%, finish opening, otherwise close
var finalFrame = TopView.Frame.X > (DrawerWidth / 2) ? TopViewFrameOpen : TopViewFrame;
UIView.AnimateNotify(0.1, () => {
TopView.Frame = finalFrame;
}, (finished) => {
TapGestureRecognizer.Enabled = DrawerOpen;
DrawerTransitioning?.Invoke(this, new DrawerTransitioningEventArgs(DrawerOpen ? DrawerTransitioningState.Open : DrawerTransitioningState.Closed));
updateStatusBarAppearance();
});
break;
}
}
void handleTapGesture(UITapGestureRecognizer tap)
{
DrawerTransitioning?.Invoke(this, new DrawerTransitioningEventArgs(DrawerTransitioningState.Transitioning));
CloseDrawer();
}
