//static Object GetNestedContextIfAny( Object context, String path )
//{
// var segements = path.Split( new[] { '.' }, StringSplitOptions.RemoveEmptyEntries );
// if ( context != null && segements.Length > 1 )
// {
// }
// return context;
//}
/// <summary>
/// Tries to generate command data.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="dataContext">The data context.</param>
/// <param name="data">The data.</param>
/// <returns></returns>
public virtual Boolean TryGenerateCommandData( PropertyPath path, Object dataContext, out CommandData data )
{
var propertyPath = path.Path;
var nestedProperties = propertyPath
.Split(new[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
var propertyLevel = 0;
while (dataContext != null && propertyLevel < nestedProperties.Length-1)
{
var currentProperty = nestedProperties[propertyLevel];
var dataContextType = dataContext.GetType();
var pi = dataContextType.GetProperty(currentProperty);
if (pi == null)
{
logger.Error("Cannot find any property named: {0}.", currentProperty);
dataContext = null;
break;
}
dataContext = pi.GetValue(dataContext, null);
propertyLevel++;
propertyPath = nestedProperties[propertyLevel];
}
if ( dataContext == null )
{
data = null;
return false;
}
var methodName = GetExpectedMethodName( propertyPath );
var factName = String.Concat( "Can", methodName );
var properties = dataContext.GetType().GetProperties();
var commandData = dataContext.GetType()
.GetMethods()
.Where( mi => mi.Name.Equals( methodName ) )
.Select( mi =>
{
var prms = mi.GetParameters();
return new CommandData()
{
DataContext = dataContext,
FastDelegate = mi.CreateVoidDelegate(),
Fact = properties.Where( pi =>
{
return pi.PropertyType == typeof( Fact ) && pi.Name.Equals( factName );
} )
.Select( pi =>
{
var fact = ( Fact )pi.GetValue( dataContext, null );
return fact;
} )
.SingleOrDefault(),
BooleanFact = properties.Where( pi =>
{
return dataContext is INotifyPropertyChanged
&& pi.PropertyType == typeof( Boolean )
&& pi.Name.Equals( factName );
} )
.Select( pi => new BooleanFact
{
FastGetter = dataContext.CreateFastPropertyGetter<Boolean>( pi ),
Name = pi.Name
} )
.SingleOrDefault(),
HasParameter = prms.Length == 1,
ParameterType = prms.Length != 1 ? null : prms[ 0 ].ParameterType,
KeyBindings = mi.GetAttributes<KeyBindingAttribute>(),
Description = mi.GetAttribute<CommandDescriptionAttribute>()
};
} )
.SingleOrDefault();
if ( commandData == null )
{
logger.Warning( "Cannot find any method named: {0}.", methodName );
}
data = commandData;
return commandData != null;
}
//static Object GetNestedContextIfAny( Object context, String path )
//{
// var segements = path.Split( new[] { '.' }, StringSplitOptions.RemoveEmptyEntries );
// if ( context != null && segements.Length > 1 )
// {
// }
// return context;
//}
/// <summary>
/// Tries to generate command data.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="dataContext">The data context.</param>
/// <param name="data">The data.</param>
/// <returns></returns>
public virtual Boolean TryGenerateCommandData(PropertyPath path, Object dataContext, out CommandData data)
{
var propertyPath = path.Path;
var nestedProperties = propertyPath
.Split(new[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
var propertyLevel = 0;
while (dataContext != null && propertyLevel < nestedProperties.Length - 1)
{
var currentProperty = nestedProperties[propertyLevel];
var dataContextType = dataContext.GetType();
var pi = dataContextType.GetProperty(currentProperty);
if (pi == null)
{
logger.Error("Cannot find any property named: {0}.", currentProperty);
dataContext = null;
break;
}
dataContext = pi.GetValue(dataContext, null);
propertyLevel++;
propertyPath = nestedProperties[propertyLevel];
}
if (dataContext == null)
{
data = null;
return(false);
}
var methodName = GetExpectedMethodName(propertyPath);
var factName = String.Concat("Can", methodName);
var properties = dataContext.GetType().GetProperties();
var commandData = dataContext.GetType()
.GetMethods()
.Where(mi => mi.Name.Equals(methodName))
.Select(mi =>
{
var prms = mi.GetParameters();
return(new CommandData()
{
DataContext = dataContext,
FastDelegate = mi.CreateVoidDelegate(),
Fact = properties.Where(pi =>
{
return pi.PropertyType == typeof(Fact) && pi.Name.Equals(factName);
})
.Select(pi =>
{
var fact = ( Fact )pi.GetValue(dataContext, null);
return fact;
})
.SingleOrDefault(),
BooleanFact = properties.Where(pi =>
{
return dataContext is INotifyPropertyChanged &&
pi.PropertyType == typeof(Boolean) &&
pi.Name.Equals(factName);
})
.Select(pi => new BooleanFact
{
FastGetter = dataContext.CreateFastPropertyGetter <Boolean>(pi),
Name = pi.Name
})
.SingleOrDefault(),
HasParameter = prms.Length == 1,
ParameterType = prms.Length != 1 ? null : prms[0].ParameterType,
KeyBindings = mi.GetAttributes <KeyBindingAttribute>(),
Description = mi.GetAttribute <CommandDescriptionAttribute>()
});
})
.SingleOrDefault();
if (commandData == null)
{
logger.Warning("Cannot find any method named: {0}.", methodName);
}
data = commandData;
return(commandData != null);
}
public virtual IDelegateCommand CreateCommand( CommandData commandData )
{
var text = ( commandData.Description == null ) ?
String.Empty :
commandData.Description.DisplayText;
var command = ( DelegateCommand )DelegateCommand.Create( text );
command.SetData( commandData );
command.OnCanExecute( o =>
{
var data = command.GetData<CommandData>();
if ( data.Fact != null )
{
return data.Fact.Eval( o );
}
else if ( data.BooleanFact != null )
{
var can = data.BooleanFact.FastGetter();
return can;
}
return true;
} )
.OnExecute( o =>
{
var data = command.GetData<CommandData>();
if ( data.HasParameter )
{
var prm = o;
if ( o is IConvertible )
{
prm = Convert.ChangeType( o, data.ParameterType );
}
data.FastDelegate( data.DataContext, new[] { prm } );
}
else
{
data.FastDelegate( data.DataContext, null );
}
} );
if ( commandData.KeyBindings != null )
{
commandData.KeyBindings
.ForEach( kb => command.AddKeyGesture( kb.Key, kb.Modifiers ) );
}
IMonitor monitor = null;
if ( commandData.Fact != null )
{
monitor = commandData.Fact;
}
else if ( commandData.BooleanFact != null )
{
monitor = PropertyObserver.For( ( INotifyPropertyChanged )commandData.DataContext )
.Observe( commandData.BooleanFact.Name );
}
if ( command != null && monitor != null )
{
command.AddMonitor( monitor );
commandData.Monitor = monitor;
}
return command;
}
public virtual IDelegateCommand CreateCommand(CommandData commandData)
{
var text = (commandData.Description == null) ?
String.Empty :
commandData.Description.DisplayText;
var command = ( DelegateCommand )DelegateCommand.Create(text);
command.SetData(commandData);
command.OnCanExecute(o =>
{
var data = command.GetData <CommandData>();
if (data.Fact != null)
{
return(data.Fact.Eval(o));
}
else if (data.BooleanFact != null)
{
var can = data.BooleanFact.FastGetter();
return(can);
}
return(true);
})
.OnExecute(o =>
{
var data = command.GetData <CommandData>();
if (data.HasParameter)
{
var prm = o;
if (o is IConvertible)
{
prm = Convert.ChangeType(o, data.ParameterType);
}
data.FastDelegate(data.DataContext, new[] { prm });
}
else
{
data.FastDelegate(data.DataContext, null);
}
});
if (commandData.KeyBindings != null)
{
commandData.KeyBindings
.ForEach(kb => command.AddKeyGesture(kb.Key, kb.Modifiers));
}
IMonitor monitor = null;
if (commandData.Fact != null)
{
monitor = commandData.Fact;
}
else if (commandData.BooleanFact != null)
{
monitor = PropertyObserver.For(( INotifyPropertyChanged )commandData.DataContext)
.Observe(commandData.BooleanFact.Name);
}
if (command != null && monitor != null)
{
command.AddMonitor(monitor);
commandData.Monitor = monitor;
}
return(command);
}
