private static void SubscribeInternal(IBindingSourceAccessor accessor, EventHandler <IBindingSource, ValueChangedEventArgs> handler, bool subscribe)
{
var singleSourceAccessor = accessor as ISingleBindingSourceAccessor;
if (singleSourceAccessor == null)
{
var sources = accessor.Sources;
if (subscribe)
{
for (int index = 0; index < sources.Count; index++)
{
sources[index].ValueChanged += handler;
}
}
else
{
for (int index = 0; index < sources.Count; index++)
{
sources[index].ValueChanged -= handler;
}
}
}
else
{
if (subscribe)
{
singleSourceAccessor.Source.ValueChanged += handler;
}
else
{
singleSourceAccessor.Source.ValueChanged -= handler;
}
}
}
public DataBinding([NotNull] ISingleBindingSourceAccessor target, [NotNull] IBindingSourceAccessor source)
{
Should.NotBeNull(target, "target");
Should.NotBeNull(source, "source");
_targetAccessor = target;
_sourceAccessor = source;
_items = Empty.Array <IBindingBehavior>();
}
/// <summary>
/// Initializes a new instance of the <see cref="DataBinding" /> class.
/// </summary>
public DataBinding([NotNull] ISingleBindingSourceAccessor target, [NotNull] IBindingSourceAccessor source)
{
Should.NotBeNull(target, "target");
Should.NotBeNull(source, "source");
_targetAccessor = target;
_sourceAccessor = source;
_behaviors = new BehaviorCollection(this);
}
protected virtual DataBinding CreateDataBinding(ISingleBindingSourceAccessor target,
IBindingSourceAccessor source, IBindingManager manager = null)
{
if (manager != null)
{
BindingServiceProvider.BindingManager = manager;
}
return(new DataBinding(target, source));
}
private void OnValueChanging(IBindingSourceAccessor sender, ValueAccessorChangingEventArgs args)
{
if (args.Cancel || _isUpdating)
{
return;
}
args.Cancel = true;
_timer.Change(Delay, Timeout.Infinite);
_context = SynchronizationContext.Current ?? ToolkitServiceProvider.UiSynchronizationContext;
}
private void OnValueChanging(IBindingSourceAccessor sender, ValueAccessorChangingEventArgs args)
{
if (args.Cancel || _isUpdating)
{
return;
}
args.Cancel = true;
_timer.Change(Delay, int.MaxValue);
_context = SynchronizationContext.Current;
}
public bool SetValue(IBindingSourceAccessor targetAccessor, IDataContext context, bool throwOnError)
{
try
{
return(SetValueInternal(targetAccessor, context, throwOnError));
}
catch (Exception) when(!throwOnError)
{
return(false);
}
}
private void SourceOnValueChanging(IBindingSourceAccessor sender, ValueAccessorChangingEventArgs args)
{
if (args.Cancel)
{
return;
}
object value = Binding.TargetAccessor.Source.GetPathMembers(false).PenultimateValue;
if (value != null && !value.IsUnsetValue())
{
args.Cancel = (bool)_member.GetValue(value, null);
}
}
private bool MemberNameEqual(string memberName, IBindingSourceAccessor accessor)
{
if (string.IsNullOrEmpty(memberName))
{
return(true);
}
var paths = ErrorPaths;
bool hasPaths = paths != null && paths.Length != 0;
if (hasPaths)
{
for (int i = 0; i < paths.Length; i++)
{
if (ToolkitExtensions.MemberNameEqual(memberName, paths[i], true))
{
return(true);
}
}
}
else if (IsDirectSource)
{
return(true);
}
var singleAccessor = accessor as ISingleBindingSourceAccessor;
string path;
if (singleAccessor != null)
{
path = singleAccessor.Source.Path.Parts.LastOrDefault();
if (hasPaths && string.IsNullOrEmpty(path))
{
return(false);
}
return(ToolkitExtensions.MemberNameEqual(memberName, path, true));
}
for (int i = 0; i < accessor.Sources.Count; i++)
{
path = accessor.Sources[i].Path.Parts.LastOrDefault();
if (hasPaths && string.IsNullOrEmpty(path))
{
continue;
}
if (ToolkitExtensions.MemberNameEqual(memberName, path, true))
{
return(true);
}
}
return(false);
}
public static bool IsAllMembersAvailable(this IBindingSourceAccessor accessor, bool checkLastMember = false)
{
Should.NotBeNull(accessor, nameof(accessor));
var s = accessor as ISingleBindingSourceAccessor;
if (s != null)
{
return(s.Source.IsAllMembersAvailable(checkLastMember));
}
var sources = accessor.Sources;
for (int i = 0; i < sources.Count; i++)
{
if (!sources[i].IsAllMembersAvailable(checkLastMember))
{
return(false);
}
}
return(true);
}
/// <summary>
/// Sets the source value.
/// </summary>
/// <param name="targetAccessor">The specified accessor to get value.</param>
/// <param name="context">The specified operation context.</param>
/// <param name="throwOnError">
/// true to throw an exception if the value cannot be set.
/// </param>
public bool SetValue(IBindingSourceAccessor targetAccessor, IDataContext context, bool throwOnError)
{
try
{
return SetValueInternal(targetAccessor, context, throwOnError);
}
catch (Exception)
{
if (throwOnError)
throw;
return false;
}
}
private static void SubscribeInternal(IBindingSourceAccessor accessor, EventHandler<IBindingSource, ValueChangedEventArgs> handler, bool subscribe)
{
var singleSourceAccessor = accessor as ISingleBindingSourceAccessor;
if (singleSourceAccessor == null)
{
var sources = accessor.Sources;
if (subscribe)
{
for (int index = 0; index < sources.Count; index++)
sources[index].ValueChanged += handler;
}
else
{
for (int index = 0; index < sources.Count; index++)
sources[index].ValueChanged -= handler;
}
}
else
{
if (subscribe)
singleSourceAccessor.Source.ValueChanged += handler;
else
singleSourceAccessor.Source.ValueChanged -= handler;
}
}
protected virtual DataBinding CreateDataBinding(ISingleBindingSourceAccessor target,
IBindingSourceAccessor source, IBindingManager manager = null)
{
if (manager != null)
BindingServiceProvider.BindingManager = manager;
return new DataBinding(target, source);
}
bool IBindingSourceAccessor.SetValue(IBindingSourceAccessor targetAccessor, IDataContext context,
bool throwOnError)
{
return SetValue(targetAccessor, context, throwOnError);
}
protected override bool SetValueInternal(IBindingSourceAccessor targetAccessor, IDataContext context,
bool throwOnError)
{
//NOTE By default multibinding doesn't support update source operation.
return false;
}
/// <summary>
/// Sets the source value.
/// </summary>
/// <param name="targetAccessor">The specified accessor to get value.</param>
/// <param name="context">The specified operation context.</param>
/// <param name="throwOnError">
/// true to throw an exception if the value cannot be set.
/// </param>
bool IBindingSourceAccessor.SetValue(IBindingSourceAccessor targetAccessor, IDataContext context,
bool throwOnError)
{
return(SetValue(targetAccessor, context, throwOnError));
}
/// <summary>
/// Sets the source value.
/// </summary>
/// <param name="targetAccessor">The specified accessor to get value.</param>
/// <param name="context">The specified operation context.</param>
/// <param name="throwOnError">
/// true to throw an exception if the value cannot be set.
/// </param>
protected override bool SetValueInternal(IBindingSourceAccessor targetAccessor, IDataContext context,
bool throwOnError)
{
IBindingPathMembers members = _bindingSource.GetPathMembers(throwOnError);
if (!members.AllMembersAvailable)
return false;
object penultimateValue = members.PenultimateValue;
IBindingMemberInfo lastMember = members.LastMember;
object oldValue;
object newValue = targetAccessor.GetValue(lastMember, context, throwOnError);
if (lastMember.CanRead)
{
oldValue = lastMember.GetValue(penultimateValue, null);
if (ReferenceEquals(oldValue, newValue) || newValue.IsUnsetValueOrDoNothing())
return false;
}
else
{
oldValue = BindingConstants.UnsetValue;
if (newValue.IsUnsetValueOrDoNothing())
return false;
}
ValueAccessorChangingEventArgs args = null;
if (ValueChanging != null)
{
args = RaiseValueChanging(context, penultimateValue, lastMember, oldValue, newValue);
if (args != null)
{
if (args.Cancel)
return false;
if (!ReferenceEquals(newValue, args.NewValue))
{
newValue = args.NewValue;
if (newValue.IsUnsetValueOrDoNothing())
return false;
}
}
}
newValue = BindingServiceProvider.ValueConverter(lastMember, lastMember.Type, newValue);
if (Equals(oldValue, newValue))
return false;
if (BindingMemberType.Event.Equals(lastMember.MemberType))
{
TryRegisterEvent((BindingActionValue)oldValue, newValue, context);
RaiseValueChanged(context, penultimateValue, lastMember, oldValue, newValue, args);
}
else
{
if (_closure != null)
_closure.Unsubscribe(false);
lastMember.SetValue(penultimateValue, new[] { newValue });
if (ValueChanged != null)
RaiseValueChanged(context, penultimateValue, lastMember, oldValue, newValue, args);
}
return true;
}
protected abstract bool SetValueInternal(IBindingSourceAccessor targetAccessor, IDataContext context,
bool throwOnError);
protected override bool SetValueInternal(IBindingSourceAccessor targetAccessor, IDataContext context,
bool throwOnError)
{
//NOTE By default multibinding doesn't support update source operation.
return(false);
}
private void SourceOnValueChanging(IBindingSourceAccessor sender, ValueAccessorChangingEventArgs args)
{
if (args.Cancel)
return;
object value = Binding.TargetAccessor.Source.GetPathMembers(false).PenultimateValue;
if (value != null && !value.IsUnsetValue())
args.Cancel = (bool)_member.GetValue(value, null);
}
protected override bool SetValueInternal(IBindingSourceAccessor targetAccessor, IDataContext context,
bool throwOnError)
{
IBindingPathMembers members = _bindingSource.GetPathMembers(throwOnError);
if (!members.AllMembersAvailable)
{
return(false);
}
object penultimateValue = members.PenultimateValue;
IBindingMemberInfo lastMember = members.LastMember;
object oldValue;
object newValue = targetAccessor.GetValue(lastMember, context, throwOnError);
if (lastMember.CanRead && !BindingMemberType.BindingContext.EqualsWithoutNullCheck(lastMember.MemberType))
{
oldValue = lastMember.GetValue(penultimateValue, null);
if (ReferenceEquals(oldValue, newValue) || newValue.IsUnsetValueOrDoNothing())
{
return(false);
}
}
else
{
oldValue = BindingConstants.UnsetValue;
if (newValue.IsUnsetValueOrDoNothing())
{
return(false);
}
}
ValueAccessorChangingEventArgs args = null;
if (ValueChanging != null)
{
args = RaiseValueChanging(context, penultimateValue, lastMember, oldValue, newValue);
if (args != null)
{
if (args.Cancel)
{
return(false);
}
if (!ReferenceEquals(newValue, args.NewValue))
{
newValue = args.NewValue;
if (newValue.IsUnsetValueOrDoNothing())
{
return(false);
}
}
}
}
newValue = BindingServiceProvider.ValueConverter(lastMember, lastMember.Type, newValue);
if (Equals(oldValue, newValue))
{
return(false);
}
if (BindingMemberType.Event.EqualsWithoutNullCheck(lastMember.MemberType))
{
TryRegisterEvent((BindingActionValue)oldValue, newValue, context);
RaiseValueChanged(context, penultimateValue, lastMember, oldValue, newValue, args);
}
else
{
if (_closure != null)
{
_closure.Unsubscribe(false, _isOneTime);
}
lastMember.SetSingleValue(penultimateValue, newValue);
if (ValueChanged != null)
{
RaiseValueChanged(context, penultimateValue, lastMember, oldValue, newValue, args);
}
}
return(true);
}
/// <summary>
/// Sets the source value.
/// </summary>
/// <param name="targetAccessor">The specified accessor to get value.</param>
/// <param name="context">The specified operation context.</param>
/// <param name="throwOnError">
/// true to throw an exception if the value cannot be set.
/// </param>
protected abstract bool SetValueInternal(IBindingSourceAccessor targetAccessor, IDataContext context,
bool throwOnError);
protected override bool SetValueInternal(IBindingSourceAccessor targetAccessor, IDataContext context,
bool throwOnError)
{
IBindingPathMembers members = _bindingSource.GetPathMembers(throwOnError);
object penultimateValue = members.PenultimateValue;
if (penultimateValue.IsUnsetValue() || (penultimateValue == null && !members.AllMembersAvailable))
{
if (members.Path.IsDebuggable)
{
DebugInfo($"Binding cannot set value for path {members.Path.Path}", new object[] { members });
}
return(false);
}
IBindingMemberInfo lastMember = members.LastMember;
object oldValue;
object newValue = targetAccessor.GetValue(lastMember, context, throwOnError);
if (lastMember.CanRead && !BindingMemberType.BindingContext.EqualsWithoutNullCheck(lastMember.MemberType))
{
if (_disableEqualityChecking && !BindingMemberType.Event.EqualsWithoutNullCheck(lastMember.MemberType))
{
oldValue = BindingConstants.UnsetValue;
}
else
{
oldValue = lastMember.GetValue(penultimateValue, null);
}
if (ReferenceEquals(oldValue, newValue) || newValue.IsUnsetValueOrDoNothing())
{
if (members.Path.IsDebuggable)
{
DebugInfo($"Binding ignores setter because old value: '{oldValue}' equals to new value '{newValue}'", new[] { members, oldValue, newValue });
}
return(false);
}
}
else
{
oldValue = BindingConstants.UnsetValue;
if (newValue.IsUnsetValueOrDoNothing())
{
if (members.Path.IsDebuggable)
{
DebugInfo($"Binding ignores setter for value '{newValue}'", new[] { members, newValue });
}
return(false);
}
}
ValueAccessorChangingEventArgs args = null;
if (ValueChanging != null)
{
args = RaiseValueChanging(context, penultimateValue, lastMember, oldValue, newValue);
if (args != null)
{
if (args.Cancel)
{
return(false);
}
if (!ReferenceEquals(newValue, args.NewValue))
{
newValue = args.NewValue;
if (newValue.IsUnsetValueOrDoNothing())
{
if (members.Path.IsDebuggable)
{
DebugInfo($"Binding ignores setter for value '{newValue}'", new[] { members, newValue });
}
return(false);
}
}
}
}
newValue = BindingServiceProvider.ValueConverter(lastMember, lastMember.Type, newValue);
if (Equals(oldValue, newValue))
{
if (members.Path.IsDebuggable)
{
DebugInfo($"Binding ignores setter because old value: '{oldValue}' equals to new value '{newValue}'", new[] { members, oldValue, newValue });
}
return(false);
}
if (BindingMemberType.Event.EqualsWithoutNullCheck(lastMember.MemberType))
{
TryRegisterEvent((BindingActionValue)oldValue, newValue, context, members);
RaiseValueChanged(context, penultimateValue, lastMember, oldValue, newValue, args);
}
else
{
_closure?.Unsubscribe(false, _isOneTime);
lastMember.SetSingleValue(penultimateValue, newValue);
if (members.Path.IsDebuggable)
{
DebugInfo($"Binding set value: '{newValue}' for source: '{penultimateValue}' with path: '{lastMember.Path}'", new[] { newValue, penultimateValue, lastMember });
}
if (ValueChanged != null)
{
RaiseValueChanged(context, penultimateValue, lastMember, oldValue, newValue, args);
}
}
return(true);
}
private bool MemberNameEqual(string memberName, IBindingSourceAccessor accessor)
{
if (string.IsNullOrEmpty(memberName))
return true;
var paths = ErrorPaths;
bool hasPaths = paths != null && paths.Length != 0;
if (hasPaths)
{
for (int i = 0; i < paths.Length; i++)
{
if (ToolkitExtensions.MemberNameEqual(memberName, paths[i], true))
return true;
}
}
var singleAccessor = accessor as ISingleBindingSourceAccessor;
string path;
if (singleAccessor != null)
{
path = singleAccessor.Source.Path.Parts.LastOrDefault();
if (hasPaths && string.IsNullOrEmpty(path))
return false;
return ToolkitExtensions.MemberNameEqual(memberName, path, true);
}
for (int i = 0; i < accessor.Sources.Count; i++)
{
path = accessor.Sources[i].Path.Parts.LastOrDefault();
if (hasPaths && string.IsNullOrEmpty(path))
continue;
if (ToolkitExtensions.MemberNameEqual(memberName, path, true))
return true;
}
return false;
}
