Xamarin reusable xaml user control and custom command - xaml

Question

first of all sorry for my english.
I am working on a iOS and Android project using Xamarin.Form
I would like to have a 'xaml user control' reusable in different way, and I need to make it clickable with ICommand
This is the StackLayoutButton component:
<?xml version="1.0" encoding="utf-8" ?>
<StackLayout xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="Installa.Controls.StackLayoutButton">
<Image x:Name="Icon" Source="{Binding Icon}" />
<Label x:Name="Text" Text="{Binding Title}" HorizontalOptions="Center" LineBreakMode="NoWrap" Font="Small" TextColor="Red" />
</StackLayout>
This is the CalendarioPage xaml page where the component is used
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:controls="clr-namespace:Installa.Controls;assembly=Installa"
x:Class="Installa.CalendarioPage">
<StackLayout>
<Label Text="{Binding ViewName}" Font="42" IsVisible="{Binding IsWindowsPhone}" />
<ActivityIndicator IsRunning="{Binding IsLoading}" IsVisible="{Binding IsLoading}" Color="Red" />
<controls:StackLayoutButton BindingContext="{Binding Blog}" TextColor="Blue" /> <!-- Command="{Binding SubmitCommand}" -->
<controls:StackLayoutButton BindingContext="{Binding Facebook}" TextColor="Red" /> <!-- Command="{Binding SubmitCommand}" -->
</StackLayout>
</ContentPage>
This is the CalendarioPage c# page:
public partial class CalendarioPage : ContentPage
{
private CalendarioViewModel vm;
public CalendarioPage()
{
InitializeComponent();
vm = new CalendarioViewModel();
this.BindingContext = vm;
}
}
This is the viewmodel class:
namespace Installa
{
public class CalendarioViewModel: BaseViewModel
{
public CalendarioViewModel()
{
blog = new Activity();
blog.Link = "www.google.it";
blog.Title = "Titolo del blog";
blog.Icon = "logomenu.png";
facebook = new Activity();
facebook.Title = "Tito Fbook";
facebook.Link = "www.facebook.it";
facebook.Icon = "icon.png";
ViewName = "nome della view";
IsLoading = false;
}
Activity blog = null;
public Activity Blog
{
get {return blog;}
}
Activity facebook = null;
public Activity Facebook
{
get { return facebook; }
}
string viewName = string.Empty;
public string ViewName
{
get { return viewName; }
set { SetProperty(ref viewName, value); }
}
public bool IsWindowsPhone
{
get
{
return Device.OS == TargetPlatform.WinPhone;
}
}
bool isLoading = false;
public bool IsLoading
{
get { return isLoading; }
set { SetProperty(ref isLoading, value); }
}
}
}
With Activity a simple class with:
public string Title { get; set; }
public string Link { get; set; }
public String Icon { get; set; }
Till now, all is working right, but now I need to implement the ICommand interface.
In StackLayoutButton c# code I try to add:
var tapGestureRecognizer = new TapGestureRecognizer();
tapGestureRecognizer.SetBinding(TapGestureRecognizer.CommandProperty, "TapCommand");
Icon.GestureRecognizers.Add(tapGestureRecognizer)
Text.GestureRecognizers.Add(tapGestureRecognizer)
Furthermore I try to add into CalendarioViewModel INotifyPropertyChanged and the 'OnTapped' method.
Into Activity.cs i add 'ICommand tapCommand' and the related get...but is not working.
I try even other..but I am not able to enable the tap on the StackLayoutButton components.
In wich way I should do ?
I'd like to be able to have a 'programmable' command...for example I would like browse to 'the link property' of Activity or be able to open a new view.
Thanks for help!
Update:
I was able to add TapGestureRecognizer into the xaml user control (StackLayoutButton.xaml.cs),
but I'd like to implement it in MVVM way,
using Xamarin.Forms;
namespace Installa.Controls
{
public partial class StackLayoutButton : StackLayout
{
public StackLayoutButton()
{
InitializeComponent();
TapGestureRecognizer tapGestureRecognizer = new TapGestureRecognizer
{
Command = new Command(OnMyComponentTapped),
CommandParameter = "ciao"
};
this.Icon.GestureRecognizers.Add(tapGestureRecognizer);
this.Text.GestureRecognizers.Add(tapGestureRecognizer);
}
async void OnMyComponentTapped(object parameter)
{
// do action
}
public Color TextColor
{
get { return this.Text.TextColor; }
set { this.Text.TextColor = value; }
}
public Label TextControl
{
get { return this.Text; }
set { this.Text = value; }
}
}
}
can anyone suggest me the way ?
Thanks

Answer 1

This is how I add gesture recognizer on my xaml view:
<Label.GestureRecognizers>
<TapGestureRecognizer Command="{Binding SelectEquipmentCommand}"/>
</Label.GestureRecognizers>
And this is the ICommand property in my ViewModel:
public ICommand SelectEquipmentCommand
{
get
{
return fSelectEquipmentCommand ?? (fSelectEquipmentCommand = new Command(async () => await SelectEquipmentTask()));
}
}
private async Task SelectEquipmentTask()
{
}