Hello,
You can do this by creating a custom behavior or an attached property that captures the tap event and then passes the coordinates to the command.
Firstly, Create a custom behavior: - Define a behavior that attaches to the TapGestureRecognizer
event. - In the event handler, get the tap coordinates. - Invoke the command with the coordinates as the parameter.
public class TapCoordinateBehavior : Behavior<Image> {
public static readonly BindableProperty CommandProperty =
BindableProperty.Create(nameof(Command), typeof(ICommand), typeof(TapCoordinateBehavior), null);
public ICommand Command
{
get { return (ICommand)GetValue(CommandProperty); }
set { SetValue(CommandProperty, value); }
}
public Image bindable { get; private set; }
protected override void OnAttachedTo(Image bindable) {
base.OnAttachedTo(bindable);
this.bindable = bindable;
bindable.BindingContextChanged += OnBindingContextChanged;
var tapGestureRecognizer = new TapGestureRecognizer();
tapGestureRecognizer.Tapped += OnTapped;
bindable.GestureRecognizers.Add(tapGestureRecognizer);
}
protected override void OnDetachingFrom(Image bindable) {
base.OnDetachingFrom(bindable);
bindable.BindingContextChanged -= OnBindingContextChanged;
if (bindable.GestureRecognizers.FirstOrDefault() is TapGestureRecognizer tapGestureRecognizer) {
tapGestureRecognizer.Tapped -= OnTapped;
}
bindable = null;
}
protected override void OnBindingContextChanged()
{
base.OnBindingContextChanged();
BindingContext = bindable.BindingContext;
}
void OnBindingContextChanged(object sender, EventArgs e)
{
OnBindingContextChanged();
}
private void OnTapped(object sender, EventArgs e) {
if (sender is Image view && e is TappedEventArgs tappedEventArgs) {
var point = new Point(tappedEventArgs.GetPosition(bindable).Value.X, tappedEventArgs.GetPosition(bindable).Value.Y);
if (Command != null && Command.CanExecute(point)) {
Command.Execute(point);
}
}
}
}
then open your layout XAML, you would attach this behavior to your image and bind the Command
to your ViewModel.
<ContentPage
...
x:Class="MauiSendEmail.NewPage1"
xmlns:local="clr-namespace:MauiSendEmail"
>
<Image Source="dotnet_bot.png" BackgroundColor="Red">
<Image.Behaviors>
<local:TapCoordinateBehavior Command="{Binding TapCommand}" />
</Image.Behaviors>
</Image>
</ContentPage>
In your viewModel, you can get the Coordinate in the Command.
public class YourViewModel
{
public ICommand TapCommand { get; }
public YourViewModel()
{
InitializeComponent();
TapCommand = new Command((obj) =>
{
if(obj != null) {
Point Coordinate = (Point)obj ;
var X= Coordinate.X;
var Y= Coordinate.Y;
}
});
}
Best Regards, Leon Lu
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