/// <summary>
/// Shows given callout
/// </summary>
/// <param name="callout">Callout to show</param>
public void ShowCallout(Callout callout)
{
if (callout == null)
{
return;
}
// Set absolute layout constrains
AbsoluteLayout.SetLayoutFlags(callout, AbsoluteLayoutFlags.None);
// Add it to MapView
if (!((AbsoluteLayout)Content).Children.Contains(callout))
{
Device.BeginInvokeOnMainThread(() => ((AbsoluteLayout)Content).Children.Add(callout));
}
// Add it to list of active Callouts
_callouts.Add(callout);
// When Callout is closed by close button
callout.CalloutClosed += (s, e) => HideCallout((Callout)s);
// Inform Callout
callout.Show();
}
internal CalloutClickedEventArgs(Callout callout, Position point, Point screenPoint, int numOfTaps)
{
Callout = callout;
Point = point;
ScreenPoint = screenPoint;
NumOfTaps = numOfTaps;
}
/// <summary>
/// Creates a callout at the given position
/// </summary>
/// <returns>The callout</returns>
/// <param name="position">Position of callout</param>
public Callout CreateCallout(Position position)
{
Device.BeginInvokeOnMainThread(() =>
{
_callout = new Callout(_mapControl)
{
Anchor = position
};
});
// My interpretation (PDD): This while keeps looping until the asynchronous call
// above has created a callout.
// An alternative might be to avoid CreateCallout from a non-ui thread by throwing
// early.
while (_callout == null)
{
;
}
var result = _callout;
_callout = null;
return(result);
}
/// <summary>
/// Creates a callout at the given position
/// </summary>
/// <returns>The callout</returns>
/// <param name="position">Position of callout</param>
public Callout CreateCallout(Position position)
{
if (position == null)
{
return(null);
}
Device.BeginInvokeOnMainThread(() => {
callout = new Callout(_mapControl)
{
Anchor = position,
};
});
while (callout == null)
{
;
}
var result = callout;
callout = null;
return(result);
}
/// <summary>
/// Hides given callout
/// </summary>
/// <param name="callout">Callout to hide</param>
public void HideCallout(Callout callout)
{
if (callout == null)
{
return;
}
// Inform Callout
callout.Hide();
// Remove it from list of active Callouts
_callouts.Remove(callout);
// Remove it from MapView
if (((AbsoluteLayout)Content).Children.Contains(callout))
{
Device.BeginInvokeOnMainThread(() => ((AbsoluteLayout)Content).Children.Remove(callout));
}
}
