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using System;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
namespace Xamarin.Forms.Platform.WinRT
{
public sealed partial class StepperControl : UserControl
{
public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("Value", typeof(double), typeof(StepperControl), new PropertyMetadata(default(double), OnValueChanged));
public static readonly DependencyProperty MaximumProperty = DependencyProperty.Register("Maximum", typeof(double), typeof(StepperControl), new PropertyMetadata(default(double), OnMaxMinChanged));
public static readonly DependencyProperty MinimumProperty = DependencyProperty.Register("Minimum", typeof(double), typeof(StepperControl), new PropertyMetadata(default(double), OnMaxMinChanged));
public static readonly DependencyProperty IncrementProperty = DependencyProperty.Register("Increment", typeof(double), typeof(StepperControl),
new PropertyMetadata(default(double), OnIncrementChanged));
public StepperControl()
{
InitializeComponent();
}
public double Increment
{
get { return (double)GetValue(IncrementProperty); }
set { SetValue(IncrementProperty, value); }
}
public double Maximum
{
get { return (double)GetValue(MaximumProperty); }
set { SetValue(MaximumProperty, value); }
}
public double Minimum
{
get { return (double)GetValue(MinimumProperty); }
set { SetValue(MinimumProperty, value); }
}
public double Value
{
get { return (double)GetValue(ValueProperty); }
set { SetValue(ValueProperty, value); }
}
public event EventHandler ValueChanged;
static void OnIncrementChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var stepper = (StepperControl)d;
stepper.UpdateEnabled(stepper.Value);
}
static void OnMaxMinChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var stepper = (StepperControl)d;
stepper.UpdateEnabled(stepper.Value);
}
void OnMinusClicked(object sender, RoutedEventArgs e)
{
UpdateValue(-Increment);
}
void OnPlusClicked(object sender, RoutedEventArgs e)
{
UpdateValue(+Increment);
}
static void OnValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var stepper = (StepperControl)d;
stepper.UpdateEnabled((double)e.NewValue);
EventHandler changed = stepper.ValueChanged;
if (changed != null)
changed(d, EventArgs.Empty);
}
void UpdateEnabled(double value)
{
double increment = Increment;
Plus.IsEnabled = value + increment <= Maximum;
Minus.IsEnabled = value - increment >= Minimum;
}
void UpdateValue(double delta)
{
double newValue = Value + delta;
Value = newValue;
}
}
}
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