public BindingExpression Create(IViewModel viewModel, String elementId, String targetProperty, Binding binding)
{
var type = viewModel.GetType();
// find property dic
IDictionary<string, MemberInfo> propertyDic;
if(!_typeBindingDic.TryGetValue(type, out propertyDic))
{
propertyDic = new Dictionary<string, MemberInfo>();
_typeBindingDic[type] = propertyDic;
}
MemberInfo propertyInfo = null;
if(!propertyDic.TryGetValue(targetProperty, out propertyInfo))
{
// find the member...
propertyInfo = type.GetMember(targetProperty).FirstOrDefault();
if(propertyInfo == null)
{
return null;
}
propertyDic[targetProperty] = propertyInfo;
}
var bindingExpression = new BindingExpression(binding, propertyInfo, viewModel);
return bindingExpression;
}
/// <summary>
/// Initializes a new instance of the <see cref="MonoMobile.Views.BindingExpression"/> class.
/// </summary>
/// <param name='binding'>
/// Binding.
/// </param>
/// <param name='targetProperty'>
/// ViewModel.<targetProperty>.
/// </param>
/// <param name='target'>
/// ViewModel to hock into.
/// </param>
/// <exception cref='ArgumentNullException'>
/// Is thrown when an argument passed to a method is invalid because it is <see langword="null" /> .
/// </exception>
public BindingExpression(Binding binding, MemberInfo targetProperty, object target)
{
if (binding == null)
throw new ArgumentNullException("binding");
if (targetProperty == null)
throw new ArgumentNullException("targetProperty");
if (target == null)
throw new ArgumentNullException("target");
Binding = binding;
Binding.Target = target;
TargetProperty = targetProperty;
if(string.IsNullOrEmpty(binding.TargetPath))
{
binding.TargetPath = targetProperty.Name;
}
object viewSource = Binding.Source;
_ViewProperty = viewSource.GetType().GetNestedMember(ref viewSource, Binding.SourcePath, true);
Binding.ViewSource = viewSource;
SourceProperty = _ViewProperty;
var dataContext = viewSource as IDataContext;
if (dataContext != null && dataContext.DataContext != null)
{
var source = dataContext.DataContext;
SourceProperty = source.GetType().GetNestedMember(ref source, Binding.SourcePath, true);
Binding.Source = source;
}
}
public static IBindingExpression GetBindingExpression(Binding binding)
{
UpdateBindings();
if (_BindingExpressions != null)
{
return _BindingExpressions.SingleOrDefault((b)=>b.Binding == binding);
}
return null;
}
/// <summary>
/// Add a single binding for any page to the list of cached bindings.
/// </summary>
/// <param name="viewModel"></param>
/// <param name="elementId"></param>
/// <param name="property"></param>
/// <param name="bindingInfo"></param>
public void Add(and.View view , Binding binding, IElement element )
{
IList<Binding> bindings;
if(!_perPageBindings.TryGetValue(view, out bindings))
{
bindings = new List<Binding>();
_perPageBindings[view] = bindings;
}
bindings.Add(binding);
binding.Target = _viewModel;
binding.Source = view;
var expression = _bindingFactory.Create((ViewModel) binding.Target,
binding.SourcePath,
binding.TargetPath,
binding);
expression.Element = element;
_bindingsForCurrentPage.Add(expression);
}
public static IBindingExpression SetBinding(IBindable target, Binding binding)
{
if (target == null)
throw new ArgumentNullException("target");
if (binding == null)
throw new ArgumentNullException("binding");
var targetProperty = binding.TargetPath;
IBindingExpression bindingExpression = null;
object dataBinding = target.DataBinding;
object nestedTarget = dataBinding;
var element = target as IElement;
MemberInfo memberInfo = null;
FieldInfo bindablePropertyInfo = null;
if (dataBinding != null)
{
var name = string.Concat(targetProperty, "Property");
bindablePropertyInfo = dataBinding.GetType().GetField(name, BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance | BindingFlags.FlattenHierarchy);
name = string.Concat(name, ".ControlValue");
memberInfo = dataBinding.GetType().GetNestedMember(ref nestedTarget, name, false);
if (memberInfo != null)
{
binding.TargetPath = name;
binding.Target = nestedTarget;
}
}
var targetReady = memberInfo != null && nestedTarget != null && binding.Source != null;
if (targetReady)
{
if (_BindingExpressions == null)
_BindingExpressions = new List<IBindingExpression>();
bindingExpression = GetBindingExpression(binding);
if (bindingExpression != null)
{
_BindingExpressions.Remove(bindingExpression);
}
bindingExpression = new BindingExpression(binding, memberInfo, nestedTarget) { Element = element };
_BindingExpressions.Add(bindingExpression);
var vmINPC = bindingExpression.Binding.Source as INotifyPropertyChanged;
if (vmINPC != null)
{
vmINPC.PropertyChanged -= HandleDataContextPropertyChanged;
vmINPC.PropertyChanged += HandleDataContextPropertyChanged;
}
var viewINPC = bindingExpression.Binding.ViewSource as INotifyPropertyChanged;
if (viewINPC != null)
{
viewINPC.PropertyChanged -= HandleDataContextPropertyChanged;
viewINPC.PropertyChanged += HandleDataContextPropertyChanged;
}
var sourceValue = bindingExpression.GetSourceValue();
var sourceCollection = sourceValue as INotifyCollectionChanged;
if (sourceCollection != null)
{
SetNotificationCollectionHandler(bindingExpression, sourceCollection);
}
}
else
{
var binderKey =_Bindings.SingleOrDefault((kvp)=>kvp.Key.Object == target && kvp.Key.Property == targetProperty).Key;
if (binderKey == null)
_Bindings.Add(new PropertyBinder() { Object = target, Property = targetProperty }, binding);
else
_Bindings[binderKey] = binding;
}
if (bindablePropertyInfo != null)
{
var bindableProperty = bindablePropertyInfo.GetValue(dataBinding) as BindableProperty;
if (bindableProperty != null)
bindableProperty.BindingExpression = bindingExpression;
}
return bindingExpression;
}
public static IBindingExpression SetBinding(IBindable target, string targetProperty, object dataContext)
{
Binding binding = dataContext as Binding;
if (dataContext == null)
{
binding = new Binding(targetProperty, "DataContext") { Source = dataContext } ;
}
return SetBinding(target, binding);
}
public Element(string caption, Binding binding): this(caption)
{
}
public BindAttribute(string sourcePath, string targetPath)
{
Binding = new Binding(sourcePath, targetPath);
}
public BindAttribute(string targetPath)
{
Binding = new Binding(targetPath);
}
public BindAttribute()
{
Binding = new Binding(null, "DataContext");
}
