public void RaiseCanExecuteChangedFor(ProxyScope proxyScope, ILGenerator il, string propertyName)
{
if (il is null)
{
throw new ArgumentNullException(nameof(il));
}
if (propertyName is null)
{
throw new ArgumentNullException(nameof(propertyName));
}
var commands = ViewModelSupport.GetCommandInfos(proxyScope.TypeDefinition.Type).Where(p => p.CanExecutePropertyNames.Contains(propertyName));
if (commands.Count() == 0)
{
return;
}
foreach (var command in commands)
{
// find the method builder created for the proxy
var getMethod = proxyScope.Methods.FirstOrDefault(p => p.Name == $"get_{command.CommandName}");
if (getMethod == null)
{
throw new ArgumentException($"No method found for the command '{command.CommandName}'");
}
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Call, getMethod);
il.Emit(OpCodes.Callvirt, RaiseCanExecuteChangedMethod);
}
}
public override void BeforeDefine(ProxyScope proxyScope)
{
if (ViewModelSupport.IsViewModel(proxyScope.TypeDefinition.Type))
{
notifyPropertyChangedFeature.ImplementFeature(proxyScope);
var commands = ViewModelSupport.GetCommandInfos(proxyScope.TypeDefinition.Type);
delegateCommandBuilder.CreateCommands(proxyScope, commands);
}
}
public override MethodBuilder CreateMethod(ProxyScope proxyScope, MethodDefinition methodDefinition, MemberInfo member, FieldBuilder memberField, FieldBuilder callerMethodField)
{
// create clean properties (invocation and callback method not added)
if (ViewModelSupport.IsViewModel(proxyScope.TypeDefinition.Type))
{
if (methodDefinition.MethodDefinitionType == MethodDefinitionType.Getter)
{
MethodBuilder methodBuilder = DefineMethodAndParameters(proxyScope, methodDefinition);
var il = methodBuilder.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Call, methodDefinition.Method);
il.Emit(OpCodes.Ret);
return(methodBuilder);
}
if (methodDefinition.MethodDefinitionType == MethodDefinitionType.Setter)
{
// Setter raise OnPropertyChanged
MethodBuilder methodBuilder = DefineMethodAndParameters(proxyScope, methodDefinition);
var il = methodBuilder.GetILGenerator();
notifyPropertyChangedFeature.CheckEquals(proxyScope, il, methodDefinition.Method);
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldarg_1);
il.Emit(OpCodes.Call, methodDefinition.Method);
notifyPropertyChangedFeature.InvokeOnPropertyChanged(proxyScope, il, methodDefinition.Method);
string propertyName = (methodDefinition as SetMethodDefinition).PropertyDefinition.Name;
delegateCommandBuilder.RaiseCanExecuteChangedFor(proxyScope, il, propertyName);
il.Emit(OpCodes.Ret);
return(methodBuilder);
}
}
return(base.CreateMethod(proxyScope, methodDefinition, member, memberField, callerMethodField));
}
public override void AfterInvoke(ProxyScope proxyScope, ILGenerator il, CallbackMethodDefinition callbackMethodDefinition)
{
// never called with clean get and set method builder
if (callbackMethodDefinition.MethodDefinition.MethodDefinitionType == MethodDefinitionType.Setter && ViewModelSupport.IsViewModel(proxyScope.TypeDefinition.Type))
{
notifyPropertyChangedFeature.InvokeOnPropertyChanged(proxyScope, il, callbackMethodDefinition.Method);
string propertyName = (callbackMethodDefinition.MethodDefinition as SetMethodDefinition).PropertyDefinition.Name;
delegateCommandBuilder.RaiseCanExecuteChangedFor(proxyScope, il, propertyName);
}
}
public override void BeforeInvoke(ProxyScope proxyScope, ILGenerator il, CallbackMethodDefinition callbackMethodDefinition)
{
// never called with clean get and set method builder
if (callbackMethodDefinition.MethodDefinition.MethodDefinitionType == MethodDefinitionType.Setter && ViewModelSupport.IsViewModel(proxyScope.TypeDefinition.Type))
{
notifyPropertyChangedFeature.CheckEquals(proxyScope, il, callbackMethodDefinition.Method);
}
}
