public void RaiseValueChanging(ValueAccessorChangingEventArgs e)
{
var handler = ValueChanging;
if (handler != null)
{
handler(this, e);
}
}
private void OnValueChanging(IBindingSourceAccessor sender, ValueAccessorChangingEventArgs args)
{
if (args.Cancel || _isUpdating)
{
return;
}
args.Cancel = true;
_timer.Change(Delay, int.MaxValue);
_context = SynchronizationContext.Current;
}
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 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 ValueAccessorChangingEventArgs RaiseValueChanging(IDataContext context, object penultimateValue,
IBindingMemberInfo lastMember, object oldValue, object newValue)
{
var valueChanging = ValueChanging;
if (valueChanging == null)
{
return(null);
}
var args = new ValueAccessorChangingEventArgs(context, penultimateValue, lastMember, oldValue, newValue);
valueChanging(this, args);
return(args);
}
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);
}
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);
}
