sharee.bike-App/ShareeSharedGuiLib/View/BarLevelInputView.xaml.cs

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3.2 KiB
C#
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ShareeSharedGuiLib.ViewModel;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
namespace ShareeSharedGuiLib.View
{
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[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class BarLevelInputView : ContentView
{
private BarLevelInputViewModel _LocalViewModel;
public BarLevelInputView()
{
InitializeComponent();
_LocalViewModel = new BarLevelInputViewModel();
_LocalViewModel.PropertyChanged += (sender, args) =>
{
// Update Current property from view model on user input.
if (args.PropertyName != nameof(BarLevelInputViewModel.Current))
return;
var viewModel = sender as BarLevelInputViewModel;
Current = viewModel?.Current != null
? viewModel?.Current.Value.ToString()
: String.Empty;
};
// Do not bind entire control to local view model. Doing this would break binding of BatteryView control.
this.BarLevelElement.BindingContext = _LocalViewModel;
this.BarLevelStepper.BindingContext = _LocalViewModel;
}
/// <summary>
/// Create bindable property to to allow "Maximum"- proptery to act as a valid target for data binding.
/// </summary>
public static readonly BindableProperty MaximumProperty = BindableProperty.Create(
"Maximum",
typeof(string),
typeof(BarLevelInputView),
"7",
propertyChanged: OnMaximumChanged);
/// <summary>
/// Holds the count of bars wich represent charing level full.
/// </summary>
public string Maximum
{
get => (string)GetValue(MaximumProperty);
set => SetValue(MaximumProperty, value);
}
/// <summary>
/// Notifies when value changes. Is required to make binding work.
/// </summary>
static void OnMaximumChanged(BindableObject bindable, object oldValue, object newValue)
{
if (newValue != oldValue)
{
var batteryView = bindable as BarLevelInputView;
batteryView?.SetMaximum(int.TryParse(newValue.ToString(), out int maximum) ? (int?)maximum : null);
}
}
public void SetMaximum(int? maximum) => _LocalViewModel.Maximum = maximum;
/// <summary>
/// Create bindable property to to allow "Current"- proptery to act as a valid target for data binding.
/// </summary>
public static readonly BindableProperty CurrentProperty = BindableProperty.Create(
"Current",
typeof(string),
typeof(BarLevelInputView),
"7",
BindingMode.TwoWay,
propertyChanged: OnCurrentChanged);
/// <summary>
/// Holds the count of bars wich represent the current charing level.
/// </summary>
public string Current
{
get => (string)GetValue(CurrentProperty);
set => SetValue(CurrentProperty, value);
}
/// <summary>
/// Notifies when value changes. Is required to make binding work.
/// </summary>
static void OnCurrentChanged(BindableObject bindable, object oldValue, object newValue)
{
if (newValue != oldValue)
{
var batteryView = bindable as BarLevelInputView;
int current;
batteryView?.SetCurrent(int.TryParse(newValue.ToString(), out current) ? (int?)current : null);
}
}
public void SetCurrent(int? current) => _LocalViewModel.Current = current;
}
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}