private void SetupPage()
{
if (_visiblePageIndex != SelectedIndex && ItemsSource != null)
{
_currentView = (MycoView)ItemTemplate.CreateContent();
_currentView.BindingContext = ItemsSource[SelectedIndex];
_currentView.Parent = this;
_currentView.Layout(new Rectangle(0, 0, Bounds.Width, Bounds.Height));
_currentView.TranslationX = 0;
if (_nextView != null)
{
_nextView.Parent = null;
_nextView = null;
}
_visiblePageIndex = SelectedIndex;
Invalidate();
}
else if (ItemsSource == null)
{
_currentView = null;
_nextView = null;
Invalidate();
}
}
public static Task <bool> FadeTo(this MycoView view, double opacity, uint length = 250, Easing easing = null)
{
if (view == null)
{
throw new ArgumentNullException("mycoview");
}
if (easing == null)
{
easing = Easing.Linear;
}
var tcs = new TaskCompletionSource <bool>();
var weakView = new WeakReference <MycoView>(view);
Action <double> fade = f =>
{
MycoView v;
if (weakView.TryGetTarget(out v))
{
v.Opacity = f;
}
};
new Animation(fade, view.Opacity, opacity, easing).Commit(view, "FadeTo", 16, length, finished: (f, a) => tcs.SetResult(a));
return(tcs.Task);
}
protected virtual void OnTouchUp(MycoView view, double x, double y, bool canceled)
{
if (TouchUp != null)
{
TouchUp(view, new TouchUpEventArgs(x, y, canceled));
}
}
void IMycoPanGestureRecognizerController.SendPanCompleted(MycoView view)
{
if (PanCompleted != null)
{
PanCompleted(this, new EventArgs());
}
}
public static Task <bool> TranslateTo(this MycoView view, double x, double y, uint length = 250, Easing easing = null)
{
if (view == null)
{
throw new ArgumentNullException("mycoview");
}
easing = easing ?? Easing.Linear;
var tcs = new TaskCompletionSource <bool>();
var weakView = new WeakReference <MycoView>(view);
Action <double> translateX = f =>
{
MycoView v;
if (weakView.TryGetTarget(out v))
{
v.TranslationX = f;
}
};
Action <double> translateY = f =>
{
MycoView v;
if (weakView.TryGetTarget(out v))
{
v.TranslationY = f;
}
};
new Animation {
{ 0, 1, new Animation(translateX, view.TranslationX, x) }, { 0, 1, new Animation(translateY, view.TranslationY, y) }
}.Commit(view, "TranslateTo", 16, length, easing,
(f, a) => tcs.SetResult(a));
return(tcs.Task);
}
void IMycoPanGestureRecognizerController.SendPanUpdatedWithUpdate(MycoView view, double updateX, double updateY)
{
if (PanUpdated != null)
{
PanUpdated(this, new PanEventArgs(updateX, updateY));
}
}
protected virtual void OnTouchDown(MycoView view, double x, double y)
{
if (TouchDown != null)
{
TouchDown(view, new TouchDownEventArgs(x, y));
}
}
void IMycoPanGestureRecognizerController.SendPanStarted(MycoView view)
{
_lastOffsetX = 0;
_lastOffsetY = 0;
if (PanStarted != null)
{
PanStarted(this, new EventArgs());
}
}
void IMycoPanGestureRecognizerController.SendPanUpdatedWithOffset(MycoView view, double offsetX, double offsetY)
{
if (PanUpdated != null)
{
PanUpdated(this, new PanEventArgs(offsetX - _lastOffsetX, offsetY - _lastOffsetY));
}
_lastOffsetX = offsetX;
_lastOffsetY = offsetY;
}
void IMycoSwipeGestureRecognizerController.SendSwipeRight(MycoView view)
{
if (SwipeRightCommand != null)
{
SwipeRightCommand.Execute(SwipeRightCommandParameter);
}
if (SwipeRight != null)
{
SwipeRight(view, new EventArgs());
}
}
public async Task AnimateToPage(int index)
{
// really animate to new page ?
if (_visiblePageIndex != index && _nextView == null && ItemsSource != null)
{
// get animation direction
var translation = _visiblePageIndex < index ? Width : -Width;
// indicate this is the one that is visible
_visiblePageIndex = index;
// save selected
SelectedIndex = index;
// get view to move to
_nextView = (MycoView)ItemTemplate.CreateContent();
_nextView.BindingContext = ItemsSource[index];
_nextView.Parent = this;
_nextView.Layout(new Rectangle(0, 0, Bounds.Width, Bounds.Height));
// setup the next view offscreen
_nextView.TranslationX = translation;
// view to set to once complete
var targetView = _nextView;
var oldView = _currentView;
// animate new in, ol dout
await Task.WhenAll(_nextView.TranslateTo(0, 0, 250, Easing.CubicInOut), _currentView.TranslateTo(-translation, 0, 250, Easing.CubicInOut));
// setup the current view
_currentView = targetView;
// null out old view
oldView.Parent = null;
oldView = null;
// allow next animation
_nextView = null;
}
}
private void SetupPage()
{
if (_visiblePageIndex != SelectedIndex && SelectedIndex >= 0 && SelectedIndex < Children.Count)
{
// only show the current view
_currentView = Children[SelectedIndex];
_currentView.IsVisible = true;
_currentView.Layout(new Rectangle(0, 0, Bounds.Width, Bounds.Height));
_currentView.TranslationX = 0;
if (_nextView != null)
{
_nextView.IsVisible = false;
_nextView = null;
}
_visiblePageIndex = SelectedIndex;
Invalidate();
}
}
protected override void OnTouchUp(MycoView view, double x, double y, bool canceled)
{
base.OnTouchUp(view, x, y, canceled);
var point = new Point(x, y);
var totalTapTime = (DateTime.Now - _downTime).TotalMilliseconds;
if (totalTapTime > TapMinimum && totalTapTime < TapMaximum && point.Distance(_downTapLocation) < TapMaxMovement && !canceled)
{
if (Command != null)
{
Command.Execute(CommandParameter);
}
if (Tapped != null)
{
Tapped(view, new TapEventArgs(x, y));
}
}
}
public async Task AnimateToPage(int index)
{
// really animate to new page ?
if (index >= 0 && index < Children.Count && _visiblePageIndex != index && _nextView == null)
{
// get animation direction
var translation = _visiblePageIndex < index ? Width : -Width;
// indicate this is the one that is visible
_visiblePageIndex = index;
// save selected
SelectedIndex = index;
// get view to move to
_nextView = Children[index];
_nextView.IsVisible = true;
_nextView.Layout(new Rectangle(0, 0, Bounds.Width, Bounds.Height));
// setup the next view offscreen
_nextView.TranslationX = translation;
// view to set to once complete
var targetView = _nextView;
var oldView = _currentView;
// animate new in, ol dout
await Task.WhenAll(_nextView.TranslateTo(0, 0, 250, Easing.CubicInOut), _currentView.TranslateTo(-translation, 0, 250, Easing.CubicInOut));
// setup the current view
_currentView = targetView;
// null out old view
oldView.IsVisible = false;
// allow next animation
_nextView = null;
}
}
void IMycoGestureRecognizerController.SendTouchDown(MycoView view, double x, double y)
{
OnTouchDown(view, x, y);
}
void IMycoGestureRecognizerController.SendTouchUp(MycoView view, double x, double y, bool canceled)
{
OnTouchUp(view, x, y, canceled);
}
protected override void OnTouchDown(MycoView view, double x, double y)
{
base.OnTouchDown(view, x, y);
_downTime = DateTime.Now;
_downTapLocation = new Point(x, y);
}
