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using System;
using Android.Widget;
using ASwitch = Android.Widget.Switch;
namespace Xamarin.Forms.Platform.Android
{
public class SwitchRenderer : ViewRenderer<Switch, ASwitch>, CompoundButton.IOnCheckedChangeListener
{
public SwitchRenderer()
{
AutoPackage = false;
}
void CompoundButton.IOnCheckedChangeListener.OnCheckedChanged(CompoundButton buttonView, bool isChecked)
{
((IViewController)Element).SetValueFromRenderer(Switch.IsToggledProperty, isChecked);
}
public override SizeRequest GetDesiredSize(int widthConstraint, int heightConstraint)
{
SizeRequest sizeConstraint = base.GetDesiredSize(widthConstraint, heightConstraint);
if (sizeConstraint.Request.Width == 0)
{
int width = widthConstraint;
if (widthConstraint <= 0)
width = (int)Context.GetThemeAttributeDp(global::Android.Resource.Attribute.SwitchMinWidth);
else if (widthConstraint <= 0)
width = 100;
sizeConstraint = new SizeRequest(new Size(width, sizeConstraint.Request.Height), new Size(width, sizeConstraint.Minimum.Height));
}
return sizeConstraint;
}
protected override void Dispose(bool disposing)
{
if (disposing && Control != null)
{
if (Element != null)
Element.Toggled -= HandleToggled;
Control.SetOnCheckedChangeListener(null);
}
base.Dispose(disposing);
}
protected override ASwitch CreateNativeControl()
{
return new ASwitch(Context);
}
protected override void OnElementChanged(ElementChangedEventArgs<Switch> e)
{
base.OnElementChanged(e);
if (e.OldElement != null)
e.OldElement.Toggled -= HandleToggled;
if (e.NewElement != null)
{
if (Control == null)
{
var aswitch = CreateNativeControl();
aswitch.SetOnCheckedChangeListener(this);
SetNativeControl(aswitch);
}
else
UpdateEnabled(); // Normally set by SetNativeControl, but not when the Control is reused.
e.NewElement.Toggled += HandleToggled;
Control.Checked = e.NewElement.IsToggled;
}
}
void HandleToggled(object sender, EventArgs e)
{
Control.Checked = Element.IsToggled;
}
void UpdateEnabled()
{
Control.Enabled = Element.IsEnabled;
}
}
}
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