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using System.ComponentModel;
using Android.Views;
using Android.Widget;
using Java.Lang;
using AButton = Android.Widget.Button;
namespace Xamarin.Forms.Platform.Android
{
public class StepperRenderer : ViewRenderer<Stepper, LinearLayout>
{
AButton _downButton;
AButton _upButton;
public StepperRenderer()
{
AutoPackage = false;
}
protected override LinearLayout CreateNativeControl()
{
return new LinearLayout(Context) { Orientation = Orientation.Horizontal };
}
protected override void OnElementChanged(ElementChangedEventArgs<Stepper> e)
{
base.OnElementChanged(e);
if (e.OldElement == null)
{
_downButton = new AButton(Context) { Text = "-", Gravity = GravityFlags.Center, Tag = this };
_downButton.SetOnClickListener(StepperListener.Instance);
_upButton = new AButton(Context) { Text = "+", Tag = this };
_upButton.SetOnClickListener(StepperListener.Instance);
_upButton.SetHeight((int)Context.ToPixels(10.0));
var layout = CreateNativeControl();
layout.AddView(_downButton);
layout.AddView(_upButton);
SetNativeControl(layout);
}
UpdateButtonEnabled();
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
switch (e.PropertyName)
{
case "Minimum":
UpdateButtonEnabled();
break;
case "Maximum":
UpdateButtonEnabled();
break;
case "Value":
UpdateButtonEnabled();
break;
case "IsEnabled":
UpdateButtonEnabled();
break;
}
}
void UpdateButtonEnabled()
{
Stepper view = Element;
_upButton.Enabled = view.IsEnabled ? view.Value < view.Maximum : view.IsEnabled;
_downButton.Enabled = view.IsEnabled ? view.Value > view.Minimum : view.IsEnabled;
}
class StepperListener : Object, IOnClickListener
{
public static readonly StepperListener Instance = new StepperListener();
public void OnClick(global::Android.Views.View v)
{
var renderer = v.Tag as StepperRenderer;
if (renderer == null)
return;
Stepper stepper = renderer.Element;
if (stepper == null)
return;
if (v == renderer._upButton)
((IElementController)stepper).SetValueFromRenderer(Stepper.ValueProperty, stepper.Value + stepper.Increment);
else if (v == renderer._downButton)
((IElementController)stepper).SetValueFromRenderer(Stepper.ValueProperty, stepper.Value - stepper.Increment);
}
}
}
}
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