/// <summary>
/// Executes the trigger.
/// <para>To access the EventArgs of the fired event, use a RelayCommand<EventArgs>
/// and leave the CommandParameter and CommandParameterValue empty!</para>
/// </summary>
/// <param name="parameter">The EventArgs of the fired event.</param>
protected override void Invoke(object parameter)
{
if (AssociatedElementIsDisabled() &&
!AlwaysInvokeCommand)
{
return;
}
var command = GetCommand();
var commandParameter = CommandParameterValue;
if (commandParameter == null &&
PassEventArgsToCommand)
{
commandParameter = EventArgsConverter == null
? parameter
: EventArgsConverter.Convert(parameter, EventArgsConverterParameter);
}
if (command != null &&
command.CanExecute(commandParameter))
{
command.Execute(commandParameter);
}
}
protected override void Invoke(object parameter)
{
var cmd = Command;
if (cmd != null)
{
var param = parameter;
if (EventArgsConverter != null)
{
param = EventArgsConverter.Convert(parameter, typeof(object), EventArgsConverterParameter, CultureInfo.InvariantCulture);
}
else if (parameter.GetType() is { } type&& type.IsGenericType && type.GetGenericTypeDefinition() is { } gType)
{
if (gType == typeof(RoutedEventArgs <>))
{
param = type.GetProperty(nameof(RoutedEventArgs <object> .Value)).GetValue(parameter);
}
else if (gType == typeof(RoutedPropertyChangedEventArgs <>))
{
param = type.GetProperty(nameof(RoutedPropertyChangedEventArgs <object> .NewValue)).GetValue(parameter);
}
}
if (cmd.CanExecute(param))
{
cmd.Execute(param);
}
}
}
private void OnFired(object sender, EventArgs eventArgs)
{
if (Command == null)
{
return;
}
var parameter = CommandParameter;
if (eventArgs != null && eventArgs != EventArgs.Empty)
{
parameter = eventArgs;
if (EventArgsConverter != null)
{
parameter = EventArgsConverter.Convert(eventArgs, typeof(object), EventArgsConverterParameter, CultureInfo.CurrentUICulture);
}
}
//执行命令，并带有参数parameter。
if (Command.CanExecute(parameter))
{
Command.Execute(parameter);
}
}
/// <summary>
/// Executes the command
/// </summary>
/// <param name="parameter">This parameter is passed to the command; the CommandParameter specified in the CommandParameterProperty is used for command invocation if not null.</param>
protected override void Invoke(object parameter)
{
if (!string.IsNullOrEmpty(TriggerParameterPath))
{
//Walk the ParameterPath for nested properties.
var propertyPathParts = TriggerParameterPath.Split('.');
object propertyValue = parameter;
foreach (var propertyPathPart in propertyPathParts)
{
var propInfo = propertyValue.GetType().GetTypeInfo().GetProperty(propertyPathPart);
propertyValue = propInfo.GetValue(propertyValue);
}
parameter = propertyValue;
}
if (EventArgsConverter != null)
{
parameter = EventArgsConverter.Convert(parameter, typeof(object), EventArgsConverterParameter, CultureInfo.CurrentUICulture);
}
var behavior = GetOrCreateBehavior();
if (behavior != null)
{
behavior.ExecuteCommand(parameter);
}
}
/// <summary>
/// Invokes the action.
/// </summary>
/// <param name="parameter">The parameter to the action. If the action does not require a parameter, the parameter may be set to a null reference.</param>
protected override void Invoke(object parameter)
{
if (AssociatedObject != null)
{
ICommand command = ResolveCommand();
if (command != null)
{
object commandParameter = CommandParameter;
//if no CommandParameter has been provided, let's check the EventArgsParameterPath
if (commandParameter == null && !string.IsNullOrWhiteSpace(EventArgsParameterPath))
{
commandParameter = GetEventArgsPropertyPathValue(parameter);
}
//next let's see if an event args converter has been supplied
if (commandParameter == null && EventArgsConverter != null)
{
commandParameter = EventArgsConverter.Convert(parameter, typeof(object), EventArgsConverterParameter, CultureInfo.CurrentCulture);
}
//last resort, let see if they want to force the event args to be passed as a parameter
if (commandParameter == null && PassEventArgsToCommand)
{
commandParameter = parameter;
}
if (command.CanExecute(commandParameter))
{
command.Execute(commandParameter);
}
}
}
}
protected override void Invoke(object sender, object eventArgs)
{
object commandParameter = CommandParameter;
bool useConverter = CommandParameter == null && ActualPassEventArgsToCommand;
if (useConverter)
{
if (EventArgsConverter != null)
{
commandParameter = EventArgsConverter.Convert(sender, eventArgs);
}
else
{
commandParameter = eventArgs;
}
}
if (CommandCanExecute(commandParameter))
{
CommandExecute(commandParameter);
}
if (useConverter && EventArgsConverter is IEventArgsTwoWayConverter)
{
((IEventArgsTwoWayConverter)EventArgsConverter).ConvertBack(sender, eventArgs, commandParameter);
}
}
private void OnFired(object sender, EventArgs eventArgs)
{
CommandEventData commandEventData;
object eventArgsparameter;
if (Command == null)
{
return;
}
eventArgsparameter = eventArgs;
if (eventArgs != null && eventArgs != EventArgs.Empty)
{
if (EventArgsConverter != null)
{
eventArgsparameter = EventArgsConverter.Convert(eventArgs, typeof(object), EventArgsConverterParameter, CultureInfo.CurrentUICulture);
}
}
commandEventData = new CommandEventData
{
Parameter = CommandParameter,
Args = eventArgsparameter,
Sender = sender
};
if (Command.CanExecute(commandEventData))
{
Command.Execute(commandEventData);
}
}
private void OnEventRaised(object sender, EventArgs e)
{
if (Command != null)
{
object parameter;
if (EventArgsConverter != null)
{
parameter = EventArgsConverter.Convert(e, typeof(object), EventArgsConverterParameter, CultureInfo.CurrentUICulture);
}
else
{
parameter = CommandParameter;
}
if (Command.CanExecute(parameter))
{
Command.Execute(parameter);
}
}
#if DEBUG
else
{
Debug.WriteLine($"{nameof(EventToCommandBehavior)}: missing Command on event handler, {EventName}: Sender={sender}, EventArgs={e}");
}
#endif
}
protected virtual void OnEventRaised(object sender, EventArgs eventArgs)
{
if (Command == null)
{
return;
}
var parameter = CommandParameter;
if (parameter == null && !string.IsNullOrEmpty(EventArgsParameterPath))
{
//Walk the ParameterPath for nested properties.
var propertyPathParts = EventArgsParameterPath.Split('.');
object propertyValue = eventArgs;
foreach (var propertyPathPart in propertyPathParts)
{
var propInfo = propertyValue.GetType().GetTypeInfo().GetDeclaredProperty(propertyPathPart);
propertyValue = propInfo.GetValue(propertyValue);
}
parameter = propertyValue;
}
if (parameter == null && eventArgs != null && eventArgs != EventArgs.Empty && EventArgsConverter != null)
{
parameter = EventArgsConverter.Convert(eventArgs, typeof(object), EventArgsConverterParameter,
CultureInfo.CurrentUICulture);
}
if (Command.CanExecute(parameter))
{
Command.Execute(parameter);
}
}
protected virtual void OnEventRaised(object sender, EventArgs eventArgs)
{
if (Command == null)
{
return;
}
var parameter = CommandParameter;
if (parameter == null && !string.IsNullOrEmpty(EventArgsParameterPath))
{
if (EventArgsParameterPath == ".")
{
parameter = eventArgs;
}
else
{
//Walk the ParameterPath for nested properties.
var propertyPathParts = EventArgsParameterPath.Split('.');
object propertyValue = eventArgs;
foreach (var propertyPathPart in propertyPathParts)
{
var propInfo = propertyValue.GetType().GetRuntimeProperty(propertyPathPart);
if (propInfo == null)
{
throw new MissingMemberException($"Unable to find {EventArgsParameterPath}");
}
propertyValue = propInfo.GetValue(propertyValue);
if (propertyValue == null)
{
break;
}
}
parameter = propertyValue;
}
}
if (parameter == null && eventArgs != null && eventArgs != EventArgs.Empty && EventArgsConverter != null)
{
parameter = EventArgsConverter.Convert(eventArgs, typeof(object), EventArgsConverterParameter,
CultureInfo.CurrentUICulture);
}
if (Command.CanExecute(parameter))
{
Command.Execute(parameter);
}
}
/// <summary>
/// Invokes the action.
/// </summary>
/// <param name="parameter">The parameter to the action. If the Action does not require a parameter, the parameter may be set to a null reference.</param>
protected override void Invoke(object parameter)
{
if (PreventInvocationIfAssociatedObjectIsDisabled && IsAssociatedObjectDisabled())
{
return;
}
var commandParameter = CommandParameter;
if ((commandParameter is null) && PassEventArgsToCommand)
{
commandParameter = EventArgsConverter != null?EventArgsConverter.Convert(AssociatedObject, parameter) : parameter;
}
ExecuteCommand(commandParameter);
}
protected override void Invoke(object parameter)
{
if (Command != null)
{
var param = parameter;
if (EventArgsConverter != null)
{
param = EventArgsConverter.Convert(parameter, typeof(object), EventArgsConverterParameter, CultureInfo.InvariantCulture);
}
if (Command.CanExecute(param))
{
Command.Execute(param);
}
}
}
protected override void Invoke(object parameter)
{
var command = GetCommand();
var commandParameter = CommandParameterValue;
if (commandParameter == null)
{
commandParameter = EventArgsConverter == null
? parameter
: EventArgsConverter.Convert(parameter, typeof(object), EventArgsConverterParameter, CultureInfo.CurrentUICulture);
}
if (command != null && command.CanExecute(commandParameter))
{
command.Execute(commandParameter);
}
}
protected override void OnTriggerHandled(object?sender = null, object?eventArgs = null)
{
var parameter = CommandParameter
?? EventArgsConverter?.Convert(eventArgs, typeof(object), null, null)
?? eventArgs;
if (parameter is not TType)
{
// changing it to the default value to avoid a cast exception
parameter = default(TType);
}
var command = Command;
if (command?.CanExecute(parameter) ?? false)
{
command.Execute(parameter);
}
}
protected override void Invoke(object sender, object eventArgs)
{
object commandParameter = CommandParameter;
if (commandParameter == null && ActualPassEventArgsToCommand)
{
if (EventArgsConverter != null)
{
commandParameter = EventArgsConverter.Convert(sender, eventArgs);
}
else
{
commandParameter = eventArgs;
}
}
if (CommandCanExecute(commandParameter))
{
CommandExecute(commandParameter);
}
}
protected override void OnEvent(object sender, object eventArgs)
{
if (eventArgs is MouseButtonEventArgs e)
{
if (e.ChangedButton == MouseButton && (ModifierKeys == null || Keyboard.Modifiers.HasFlag(ModifierKeys)))
{
e.Handled = MarkRoutedEventsAsHandled;
if (PassEventArgsToCommand == true && EventArgsConverter != null)
{
CommandParameter = EventArgsConverter.Convert(sender, eventArgs);
}
if (ExecuteCommandWhenParameterNull || CommandParameter != null)
{
Command?.Execute(CommandParameter);
}
}
}
}
void Invoke(object parameter)
{
if (!CanInvokeCommand())
{
return;
}
object commandParameter = CommandParameter;
if (commandParameter == null && PassEventArgsToCommand)
{
if (EventArgsConverter != null)
{
parameter = EventArgsConverter.Convert(parameter);
}
commandParameter = parameter;
}
if (Command != null && Command.CanExecute(commandParameter))
{
Command.Execute(commandParameter);
}
}