public void DoBind(VMBehaviour vm, object parameter, GameObject obj, Component component)
{
if (component == null)
{
Debugger.LogError("CommandBinder", obj.name + " component null.");
return;
}
if (string.IsNullOrEmpty(this.Command))
{
Debugger.LogError("CommandBinder", obj.name + " command key empty.");
return;
}
if (string.IsNullOrEmpty(this.Event))
{
Debugger.LogError("CommandBinder", obj.name + " event key empty.");
return;
}
// component type reflection
componentType = component.GetType();
componentReflection = ReflectionCache.Singleton[componentType];
// command type reflection
command = vm.GetCommand(this.Command);
if (command == null)
{
Debugger.LogError("CommandBinder", obj.name + " command null.");
return;
}
commandType = command.GetType().BaseType;
if (!typeof(BaseCommand).IsAssignableFrom(commandType))
{
Debugger.LogError("CommandBinder", obj.name + " command type error.");
return;
}
commandReflection = ReflectionCache.Singleton[commandType];
// source event type reflection
// TODO: 性能优化 GetValue
// UGUI 组件的 event 有的是 property，有的不是，所以 field 和 property 都判断
FieldInfo sourceEventFieldInfo = componentReflection.GetField(this.Event);
PropertyInfo sourceEventPropertyInfo = componentReflection.GetProperty(this.Event);
if (sourceEventFieldInfo != null)
{
sourceEventType = sourceEventFieldInfo.FieldType.BaseType;
sourceEventObj = sourceEventFieldInfo.GetValue(component);
}
if (sourceEventPropertyInfo != null)
{
sourceEventType = sourceEventPropertyInfo.PropertyType.BaseType;
sourceEventObj = sourceEventPropertyInfo.GetValue(component);
}
if (sourceEventType == null || sourceEventObj == null)
{
Debugger.LogError("CommandBinder", obj.name + " event null.");
return;
}
if (!typeof(UnityEngine.Events.UnityEventBase).IsAssignableFrom(sourceEventType))
{
Debugger.LogError("CommandBinder", obj.name + " event type error.");
return;
}
sourceEventReflection = ReflectionCache.Singleton[sourceEventType];
// 判断 event 和 command 参数类型是否匹配
bool genericTypeExplicit = true;
while (true)
{
if (sourceEventType.IsGenericType != commandType.IsGenericType)
{
genericTypeExplicit = false;
break;
}
Type[] sourceEventGenericTypes = sourceEventReflection.GetGenericArguments();
Type[] commandGenericTypes = commandReflection.GetGenericArguments();
if (sourceEventGenericTypes.Length != commandGenericTypes.Length)
{
genericTypeExplicit = false;
break;
}
for (int j = 0; j < sourceEventGenericTypes.Length; j++)
{
if (sourceEventGenericTypes[j] != commandGenericTypes[j])
{
genericTypeExplicit = false;
break;
}
}
break;
}
if (!genericTypeExplicit)
{
Debugger.LogError("CommandBinder", obj.name + " event type and command type not explicit.");
return;
}
command.BindVM(vm);
sourceEventAction = command.AddListenerToEvent(sourceEventObj, parameter);
Selectable selectableComponent = component as Selectable;
if (selectableComponent != null)
{
canExecuteHandler = new Action(delegate
{
selectableComponent.interactable = command.CanExecute(parameter);
});
command.AddCanExecuteChangedListener(canExecuteHandler);
selectableComponent.interactable = command.CanExecute(parameter);
}
}
