// public static void AddConverter(Type type, ConvertObjectHandler obj)
// {
// if (_converters == null)
// _converters = new Dictionary<Type, ConvertObjectHandler>();
//
// _converters[type] = obj;
// }
#endregion
#region Methods
/// <summary>
/// Adds an Option to a specified target.
/// </summary>
/// <param name="key">property key - any spaces will be removed</param>
/// <param name="value">start value of the property</param>
/// <param name="desc">property description</param>
/// <param name="category">property category</param>
/// <param name="optionChangedEvent">event handler to receive the
/// PropertyValueChanged event</param>
/// <param name="target">the object that will receive the changed
/// property values: an internal event handler will be created and the
/// name must be the name of a property of the type that the target is
/// whatever that meant</param>
internal void AddOption(
string key,
object value,
string desc,
string category,
OptionChangedEventHandler optionChangedEvent = null,
object target = null)
{
// key = key.Replace(" ", String.Empty); // nobody be stupid ...
ViewerOption option;
if (!_options.ContainsKey(key))
{
option = new ViewerOption(value, desc, category);
_options[key] = option;
}
else
{
option = _options[key];
option.Value = value;
option.Description = desc;
}
if (optionChangedEvent != null)
{
option.OptionChangedEvent += optionChangedEvent;
}
else if (target != null)
{
_properties[key] = new Property(target, key);
this[key].OptionChangedEvent += OnOptionChanged;
}
}
/// <summary>
/// Gets the object tied to the key. If there is no object one will be
/// created with the value specified.
/// </summary>
/// <param name="key">the name of the Option object</param>
/// <param name="value">if there is no Option object tied to the
/// string, an Option will be created with this as its Value</param>
/// <returns>the Option object tied to the key</returns>
internal ViewerOption GetOption(string key, object value)
{
if (!_options.ContainsKey(key))
{
var option = new ViewerOption(value, null, null);
_options.Add(key, option);
}
return(_options[key]);
}
/// <summary>
/// Emits a generic get/set property in which the result returned [there
/// is no return..] resides in a hashtable whose key is the name of the
/// property. Ie, does complicated stuff.
/// </summary>
/// <param name="typeBuilder"></param>
/// <param name="fieldInfo"></param>
/// <param name="option"></param>
/// <param name="name"></param>
private void EmitProperty(
TypeBuilder typeBuilder,
FieldInfo fieldInfo,
ViewerOption option,
string name)
{
// to figure out what opcodes to emit, i would compile a small class
// having the functionality i wanted, and view it with ildasm.
// peverify is also kinda nice to use to see what errors there are.
var propertyBuilder = typeBuilder.DefineProperty(
name,
PropertyAttributes.None,
option.Value.GetType(),
new Type[] {});
var objType = option.Value.GetType();
var methodGetter = typeBuilder.DefineMethod(
"get_" + name,
MethodAttributes.Public,
objType,
new Type[] {});
var generator = methodGetter.GetILGenerator();
generator.DeclareLocal(objType);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, fieldInfo);
generator.Emit(OpCodes.Ldstr, name);
generator.EmitCall(
OpCodes.Callvirt,
typeof(Hashtable).GetMethod("get_Item"),
null);
if (objType.IsValueType)
{
generator.Emit(OpCodes.Unbox, objType);
if (_typeHash[objType] != null)
{
generator.Emit((OpCode)_typeHash[objType]);
}
else
{
generator.Emit(OpCodes.Ldobj, objType);
}
}
else
{
generator.Emit(OpCodes.Castclass, objType);
}
generator.Emit(OpCodes.Stloc_0);
generator.Emit(OpCodes.Br_S, (byte)0);
generator.Emit(OpCodes.Ldloc_0);
generator.Emit(OpCodes.Ret);
var methodSetter = typeBuilder.DefineMethod(
"set_" + name,
MethodAttributes.Public,
null,
new [] { objType });
generator = methodSetter.GetILGenerator();
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldfld, fieldInfo);
generator.Emit(OpCodes.Ldstr, name);
generator.Emit(OpCodes.Ldarg_1);
if (objType.IsValueType)
{
generator.Emit(OpCodes.Box, objType);
}
generator.EmitCall(
OpCodes.Callvirt,
typeof(Hashtable).GetMethod("set_Item"),
null);
generator.Emit(OpCodes.Ret);
propertyBuilder.SetGetMethod(methodGetter);
propertyBuilder.SetSetMethod(methodSetter);
if (option.Description != null)
{
var ctorInfo = typeof(DescriptionAttribute).GetConstructor(new [] { typeof(string) });
var attributeBuilder = new CustomAttributeBuilder(ctorInfo, new object[] { option.Description });
propertyBuilder.SetCustomAttribute(attributeBuilder);
}
if (option.Category != null)
{
var ctorInfo = typeof(CategoryAttribute).GetConstructor(new [] { typeof(string) });
var attributeBuilder = new CustomAttributeBuilder(ctorInfo, new object[] { option.Category });
propertyBuilder.SetCustomAttribute(attributeBuilder);
}
}
