/// <summary>
/// Callback executed when an item's property gets updated
/// </summary>
/// <param name="sender">
/// Items
/// </param>
/// <param name="e">
/// Argument containing the name of the property that raised the changes
/// </param>
private void ItemPropertyChanged(object sender, PropertyChangedEventArgs e)
{
// lots of properties gets updated, we watch only those which belongs to visible fieldnames
// and those who were registered for propertychanges monitoring
// and of course if the item is still on the list
if (_valueGetters.Any(vg => vg.FieldName == e.PropertyName))
{
PropertyFilterValueGetter pf =
_valueGetters.FirstOrDefault(vg => vg.FieldName == e.PropertyName);
if (pf.MonitorPropertyChanged && _substituteSource.Contains(sender))
{
// To avoid doing a refresh on a property change which would end in a very hawful user experience
// we simulate a replace to the collection because the filter is automatically applied in this case
int index = _substituteSource.IndexOf(sender);
var argsReplace = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Replace,
new List <object> {
sender
},
new List <object> {
sender
}, index);
_substituteSource.RaiseCollectionChanged(argsReplace);
}
NotifyResults(); // Notify results
}
}
/// <summary>
/// Method called when FilterColumns property changes
/// </summary>
/// <exception cref="InvalidOperationException">
/// Raised when a a property filter refers to a non existing candidate object type property
/// </exception>
private void SetFilterColumns()
{
var propertyFilters = Items.Cast<ValueFilter>().ToList();
if (UnderlyingType.Equals(typeof (string)) || UnderlyingType.IsValueType)
{
// for native types, only one ValueFilter accepted to apply string format or IValueConverter
if (propertyFilters.Count > 1)
{
throw new InvalidOperationException(
"Only one property filter is authorized when underlying type is String or a value type.");
}
// Then if there is no property filter at all, there is no conversion needed and we build a defautl property getter
// and there is one, we build a property getter accordingly
_valueGetters.Add(propertyFilters.Count == 0
? new PropertyFilterValueGetter(new ValueFilter())
: new PropertyFilterValueGetter(propertyFilters[0]));
}
// if the underlying type if neither a string nor value type, then it is a reference type
else
{
IEnumerable<PropertyFilter> apfs;
// if there is no PropertyFilter defined, we build it by default based on every instance public properties of the underlying type
if (propertyFilters.Count == 0)
{
apfs = new List<PropertyFilter>();
// Get the type Properties
var pis = UnderlyingType.GetProperties(BindingFlags.Public | BindingFlags.Instance);
// iterate
foreach (var propertyInfo in pis)
{
var pf = new PropertyFilter(propertyInfo.Name, DefaultMonitorPropertyChanges);
var pfvg = new PropertyFilterValueGetter(pf, UnderlyingType); // Generate...
_valueGetters.Add(pfvg); // ...and add value getter for each properties
}
}
else
{
// and thus every ValueFilter must be PropertyFilter
if (propertyFilters.Any(p => !(p is PropertyFilter)))
{
throw new InvalidOperationException("ValueFilter can't be used with reference type.");
}
apfs = propertyFilters.Cast<PropertyFilter>().ToList();
foreach (PropertyFilter pf in apfs)
{
// Get the PropertyInfo
PropertyInfo pi = UnderlyingType.GetProperty(pf.FieldName);
// this info is mandatory
if (pi == null)
{
throw new InvalidOperationException(
string.Format("Cant't find the property {0} for type {1}",
pf.FieldName, UnderlyingType.Name));
}
// If pi is ok, build the value getter and add it to the list
var pfvg = new PropertyFilterValueGetter(pf, UnderlyingType);
_valueGetters.Add(pfvg);
}
}
// If there is no ValueFilter which is set to be monitored for property changes, we keep track of it to avoid to subscribe to propertychanged event later on
_hasAnyPropertyChangesToMonitor = apfs.Any(p => p.MonitorPropertyChanged);
}
}
/// <summary>
/// Method called when FilterColumns property changes
/// </summary>
/// <exception cref="InvalidOperationException">
/// Raised when a a property filter refers to a non existing candidate object type property
/// </exception>
private void SetFilterColumns()
{
var propertyFilters = Items.Cast <ValueFilter>().ToList();
if (UnderlyingType.Equals(typeof(string)) || UnderlyingType.IsValueType)
{
// for native types, only one ValueFilter accepted to apply string format or IValueConverter
if (propertyFilters.Count > 1)
{
throw new InvalidOperationException(
"Only one property filter is authorized when underlying type is String or a value type.");
}
// Then if there is no property filter at all, there is no conversion needed and we build a defautl property getter
// and there is one, we build a property getter accordingly
_valueGetters.Add(propertyFilters.Count == 0
? new PropertyFilterValueGetter(new ValueFilter())
: new PropertyFilterValueGetter(propertyFilters[0]));
}
// if the underlying type if neither a string nor value type, then it is a reference type
else
{
IEnumerable <PropertyFilter> apfs;
// if there is no PropertyFilter defined, we build it by default based on every instance public properties of the underlying type
if (propertyFilters.Count == 0)
{
apfs = new List <PropertyFilter>();
// Get the type Properties
var pis = UnderlyingType.GetProperties(BindingFlags.Public | BindingFlags.Instance);
// iterate
foreach (var propertyInfo in pis)
{
var pf = new PropertyFilter(propertyInfo.Name, DefaultMonitorPropertyChanges);
var pfvg = new PropertyFilterValueGetter(pf, UnderlyingType); // Generate...
_valueGetters.Add(pfvg); // ...and add value getter for each properties
}
}
else
{
// and thus every ValueFilter must be PropertyFilter
if (propertyFilters.Any(p => !(p is PropertyFilter)))
{
throw new InvalidOperationException("ValueFilter can't be used with reference type.");
}
apfs = propertyFilters.Cast <PropertyFilter>().ToList();
foreach (PropertyFilter pf in apfs)
{
// Get the PropertyInfo
PropertyInfo pi = UnderlyingType.GetProperty(pf.FieldName);
// this info is mandatory
if (pi == null)
{
throw new InvalidOperationException(
string.Format("Cant't find the property {0} for type {1}",
pf.FieldName, UnderlyingType.Name));
}
// If pi is ok, build the value getter and add it to the list
var pfvg = new PropertyFilterValueGetter(pf, UnderlyingType);
_valueGetters.Add(pfvg);
}
}
// If there is no ValueFilter which is set to be monitored for property changes, we keep track of it to avoid to subscribe to propertychanged event later on
_hasAnyPropertyChangesToMonitor = apfs.Any(p => p.MonitorPropertyChanged);
}
}
