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using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
namespace Xamarin.PropertyEditing.Windows
{
[TemplatePart (Name = "up", Type = typeof(ButtonBase))]
[TemplatePart (Name = "down", Type = typeof(ButtonBase))]
internal class Spinner
: Control
{
static Spinner ()
{
DefaultStyleKeyProperty.OverrideMetadata (typeof(Spinner), new FrameworkPropertyMetadata (typeof(Spinner)));
FocusableProperty.OverrideMetadata (typeof(Spinner), new FrameworkPropertyMetadata (false));
}
public static readonly DependencyProperty ValueProperty = DependencyProperty.Register (
"Value", typeof(int), typeof(Spinner), new FrameworkPropertyMetadata (default(int), FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, (d,p) => ((Spinner)d).OnValueChanged ()));
public int Value
{
get { return (int) GetValue (ValueProperty); }
set { SetValue (ValueProperty, value); }
}
public static readonly DependencyProperty MinimumValueProperty = DependencyProperty.Register (
"MinimumValue", typeof(int), typeof(Spinner), new PropertyMetadata (default(int)));
public int MinimumValue
{
get { return (int) GetValue (MinimumValueProperty); }
set { SetValue (MinimumValueProperty, value); }
}
public override void OnApplyTemplate ()
{
base.OnApplyTemplate ();
this.up = GetTemplateChild ("up") as ButtonBase;
this.down = GetTemplateChild ("down") as ButtonBase;
this.display = GetTemplateChild("display") as TextBlock;
if (this.up == null || this.down == null)
throw new InvalidOperationException ("Spinner's template needs an up and down button");
this.up.Click += (sender, args) => {
args.Handled = true;
Adjust (1);
};
this.down.Click += (sender, args) => {
args.Handled = true;
Adjust (-1);
};
Adjust (MinimumValue);
OnValueChanged();
}
private ButtonBase up, down;
private TextBlock display;
private void Adjust (int d)
{
SetCurrentValue (ValueProperty, Value + d);
this.down.IsEnabled = Value > MinimumValue;
}
private void OnValueChanged ()
{
if (this.display == null)
return;
this.display.Text = Value.ToString ();
}
}
}
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