/// <summary>
/// Initializes a new instance of the <see cref="Mobile.Mvvm.DataBinding.BindingExpression"/> class.
/// </summary>
public BindingExpression(object target, string targetProperty, object source, Binding binding)
{
if (target == null)
{
throw new ArgumentNullException("target");
}
if (string.IsNullOrEmpty(targetProperty))
{
throw new ArgumentNullException("targetProperty");
}
if (source == null)
{
throw new ArgumentNullException("source");
}
if (binding == null)
{
throw new ArgumentNullException("binding");
}
this.PropertyAccessor = new ReflectionPropertyAccessor(targetProperty);
this.Initialize(target, targetProperty, source, binding);
}
/// <summary>
/// Initializes a new instance of the <see cref="Mobile.Mvvm.DataBinding.WeakBindingExpression"/> class.
/// </summary>
public WeakBindingExpression(object target, string targetProperty, IPropertyAccessor accessor, object source, Binding binding)
{
if (target == null)
{
throw new ArgumentNullException("target");
}
if (string.IsNullOrEmpty(targetProperty))
{
throw new ArgumentNullException("targetProperty");
}
if (source == null)
{
throw new ArgumentNullException("source");
}
if (accessor == null)
{
throw new ArgumentNullException("accessor");
}
if (binding == null)
{
throw new ArgumentNullException("binding");
}
this.SafelyUpdateTarget = true;
this.PropertyAccessor = accessor;
this.Initialize(target, targetProperty, source, binding);
}
/// <summary>
/// Sets the binding between target and source.
/// </summary>
public static IBindingExpression AddBinding(this IPropertyInjection target, string propertyName, object source, Binding binding)
{
var scope = target.GetBindingScopeOrDefault();
var expression = new WeakBindingExpression(target, propertyName, source, binding);
scope.Add(expression);
return expression;
}
public void WhenDisposingTheExpression_ThenTargetObjectEventIsNull()
{
this.SetUp();
var binding = new Binding("Property1");
var expression = new EventTriggeredBindingExpression<EventTargetObject, EventArgs>(this.Target, "PropertyA", "PropertyChanged", this.Source, binding);
expression.Bind();
expression.Dispose();
Assert.AreEqual(this.Target.HasEventHandler, false);
}
public void WhenBindingWithAnEvent_ThenTheSourcePropertyIsUpdated()
{
this.SetUp();
var binding = new Binding("Property1");
var expression = new EventTriggeredBindingExpression<EventTargetObject, EventArgs>(this.Target, "PropertyA", "PropertyChanged", this.Source, binding);
expression.Bind();
this.Target.PropertyA = Guid.NewGuid().ToString();
Assert.AreEqual(this.Target.PropertyA, this.Source.Property1);
}
private IBindingExpression ParseSingleExpression(string expression, object target, object source)
{
var tokens = this.Tokenise(expression);
if (tokens.Count != 3 && tokens.Count != 5)
{
return null;
}
var targetProperty = tokens[0];
var bindingMode = this.ModeFromToken(tokens[1]);
var sourceProperty = string.Empty;
IValueConverter converter = null;
object convertParam = null;
if (tokens.Count == 3)
{
sourceProperty = tokens[2].Trim();
}
else
{
converter = ConverterFromToken(tokens[2]);
sourceProperty = tokens[3];
convertParam = tokens[4];
}
var binding = new Binding(sourceProperty);
binding.Converter = converter;
binding.ConverterParameter = convertParam;
binding.Mode = bindingMode;
return new WeakBindingExpression(target, targetProperty, source, binding);
}
/// <summary>
/// Sets the binding between target and source.
/// </summary>
public static IBindingExpression AddBinding(this IBindingScope scope, object target, string propertyName, object source, Binding binding)
{
var expression = new WeakBindingExpression(target, propertyName, source, binding);
scope.Add(expression);
return expression;
}
/// <summary>
/// Sets the binding between target and source.
/// </summary>
public static IBindingExpression AddBinding(this IBindingScope scope, object target, object source, Binding binding)
{
return scope.AddBinding(target, binding.PropertyName, source, binding);
}
/// <summary>
/// Initialize the binding instance.
/// </summary>
private void Initialize(object target, string targetProperty, object source, Binding binding)
{
this.target = new WeakReference(target);
this.source = new WeakReference(source);
this.TargetProperty = targetProperty;
this.Binding = binding;
this.targetPropertyType = this.PropertyAccessor.GetPropertyType(target);
}
public virtual void SetUp()
{
this.Binding = new Binding("Property1");
}
/// <summary>
/// Initialize the binding instance.
/// </summary>
private void Initialize(object target, string targetProperty, object source, Binding binding)
{
this.Target = target;
this.Source = source;
this.TargetProperty = targetProperty;
this.Binding = binding;
this.targetPropertyType = this.PropertyAccessor.GetPropertyType(target);
}
/// <summary>
/// Sets a one-time binding between target and source.
/// </summary>
public static void OneTimeBind(this object target, string propertyName, IPropertyAccessor accessor, object source, Binding binding)
{
var expression = new BindingExpression(target, propertyName, accessor, source, binding);
expression.Dispose();
}
/// <summary>
/// Sets a one-time binding between target and source.
/// </summary>
public static void OneTimeBind(this object target, object source, Binding binding)
{
target.OneTimeBind(binding.PropertyName, source, binding);
}
/// <summary>
/// Sets the binding between target and source.
/// </summary>
public static IBindingExpression AddBinding(this IPropertyInjection target, object source, Binding binding)
{
var scope = target.GetBindingScopeOrDefault();
return scope.AddBinding(target, binding.PropertyName, source, binding);
}
