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Adds a TappedGestureRecognizer to FlexLayoutItems
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Input;
using PosApp.Components.Animations;
using Xamarin.Forms;
namespace Apptivity.Components.Behaviors
{
public class FlexLayoutItemTappedBehavior : Behavior<FlexLayout>
{
public static readonly BindableProperty CommandProperty =
BindableProperty.Create(nameof(Command), typeof(ICommand), typeof(FlexLayoutItemTappedBehavior), defaultBindingMode: BindingMode.OneWay);
public ICommand Command
{
get => (ICommand)this.GetValue(CommandProperty);
set => this.SetValue(CommandProperty, value);
}
protected override void OnAttachedTo(FlexLayout bindable)
{
base.OnAttachedTo(bindable);
if (bindable.BindingContext != null)
{
this.BindingContext = bindable.BindingContext;
}
bindable.BindingContextChanged += this.OnFlexLayoutBindingChanged;
bindable.ChildAdded += this.OnFlexLayoutChildAdded;
}
protected override void OnDetachingFrom(FlexLayout bindable)
{
base.OnDetachingFrom(bindable);
bindable.BindingContextChanged -= this.OnFlexLayoutBindingChanged;
bindable.ChildAdded -= this.OnFlexLayoutChildAdded;
foreach (var child in bindable.Children)
{
if (child is View childView && childView.GestureRecognizers.Any())
{
var tappedGestureRecognizers = childView.GestureRecognizers.Where(x => x is TapGestureRecognizer).Cast<TapGestureRecognizer>();
foreach (var tapGestureRecognizer in tappedGestureRecognizers)
{
tapGestureRecognizer.Tapped -= this.OnItemTapped;
childView.GestureRecognizers.Remove(tapGestureRecognizer);
}
}
}
}
private void OnFlexLayoutBindingChanged(object sender, EventArgs e)
{
if (sender is FlexLayout flexLayout)
{
this.BindingContext = flexLayout.BindingContext;
}
}
private void OnFlexLayoutChildAdded(object sender, ElementEventArgs args)
{
if (args.Element is View view)
{
var tappedGestureRecognizer = new TapGestureRecognizer();
tappedGestureRecognizer.Tapped += this.OnItemTapped;
view.GestureRecognizers.Add(tappedGestureRecognizer);
}
}
private async void OnItemTapped(object sender, EventArgs e)
{
if (sender is VisualElement visualElement)
{
var animations = new List<AnimationBase>();
var scaleIn = new ScaleToAnimation
{
Target = visualElement,
ScaleTo = .95,
Duration = 50
};
animations.Add(scaleIn);
var scaleOut = new ScaleToAnimation
{
Target = visualElement,
ScaleTo = 1,
Duration = 50
};
animations.Add(scaleOut);
var storyBoard = new StoryBoard(animations);
await storyBoard.Begin();
}
if (sender is BindableObject bindable && this.Command != null && this.Command.CanExecute(null))
{
this.Command.Execute(bindable.BindingContext);
}
}
}
}
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