// --------------------------------------------------------------------------
//
// CONSTRUCTORS
//
// --------------------------------------------------------------------------
public App()
{
// Create the orange image that goes on the main screen of the app
var orangeImage = new CustomImage {
Aspect = Aspect.Fill
};
orangeImage.Source = "orange_square.png";
// Create a ContentPage to use as the view of the app.
var page = new ContentPage {
Content = new StackLayout {
VerticalOptions = LayoutOptions.Center,
Children = { orangeImage }
}
};
// When the image dispatches a tap event (custom event, see CustomImage.cs),
// then display an alert.
orangeImage.TapEvent += (object sender, PointEventArgs e) => {
page.DisplayAlert("Tap!", String.Format("({0}, {1})", e.X, e.Y), "Cancel");
};
// Set the main page of the app.
MainPage = page;
}
// ---------------------------------------------------------------------------
//
// METHODS
//
// ---------------------------------------------------------------------------
//
// Use this method to customize the native control as desired
//
protected override void OnElementChanged(ElementChangedEventArgs<Image> e) {
base.OnElementChanged (e);
if (e.NewElement != null) {
// Grab the Xamarin.Forms element from the incoming event
formsElement = e.NewElement as CustomImage;
// Grab the native implementation of the Xamarin.Forms element from the incoming event
nativeElement = Control as ImageView;
// Use this object to handle the touch events coming from the native elemtn
nativeElement.SetOnTouchListener (this);
// Create a gesture detector, and use this object to handle its events
_gestureDetector = new GestureDetector (this);
}
}
// ---------------------------------------------------------------------------
//
// METHODS
//
// ---------------------------------------------------------------------------
//
// Set up the custom renderer. In this case, that means set up the gesture
// recognizer.
//
protected override void OnElementChanged(ElementChangedEventArgs<Image> e) {
base.OnElementChanged (e);
if (e.NewElement != null) {
// Grab the Xamarin.Forms control (not native)
formsElement = e.NewElement as CustomImage;
// Grab the native representation of the Xamarin.Forms control
nativeElement = Control as UIImageView;
// Set up a tap gesture recognizer on the native control
nativeElement.UserInteractionEnabled = true;
UITapGestureRecognizer tgr = new UITapGestureRecognizer (TapHandler);
nativeElement.AddGestureRecognizer (tgr);
}
}
// --------------------------------------------------------------------------
//
// CONSTRUCTORS
//
// --------------------------------------------------------------------------
public App () {
// Create the orange image that goes on the main screen of the app
var orangeImage = new CustomImage { Aspect = Aspect.Fill };
orangeImage.Source = "orange_square.png";
// Create a ContentPage to use as the view of the app.
var page = new ContentPage {
Content = new StackLayout {
VerticalOptions = LayoutOptions.Center,
Children = { orangeImage }
}
};
// When the image dispatches a tap event (custom event, see CustomImage.cs),
// then display an alert.
orangeImage.TapEvent += (object sender, PointEventArgs e) => {
page.DisplayAlert("Tap!", String.Format("({0}, {1})", e.X, e.Y), "Cancel");
};
// Set the main page of the app.
MainPage = page;
}