//
// Author:
// Lluis Sanchez Gual (lluis@ximian.com)
-//
-// (C) Novell, Inc.
+// Ivan N. Zlatev (contact i-nZ.net)
+// (C) Novell, Inc.
//
//
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
-//
+//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
-//
+//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
{
PropertyInfo _member;
Type _componentType;
-
+ Type _propertyType;
+ PropertyInfo getter, setter;
+ bool accessors_inited;
+
public ReflectionPropertyDescriptor (Type componentType, PropertyDescriptor oldPropertyDescriptor, Attribute [] attributes)
: base (oldPropertyDescriptor, attributes)
{
_componentType = componentType;
+ _propertyType = oldPropertyDescriptor.PropertyType;
}
-
+
public ReflectionPropertyDescriptor (Type componentType, string name, Type type, Attribute [] attributes)
: base (name, attributes)
{
_componentType = componentType;
+ _propertyType = type;
}
-
+
public ReflectionPropertyDescriptor (PropertyInfo info)
- : base (info.Name, (Attribute[])info.GetCustomAttributes (true))
+ : base (info.Name, null)
{
_member = info;
_componentType = _member.DeclaringType;
+ _propertyType = info.PropertyType;
}
-
+
PropertyInfo GetPropertyInfo ()
{
if (_member == null) {
- _member = _componentType.GetProperty (Name);
+ _member = _componentType.GetProperty (Name, BindingFlags.GetProperty | BindingFlags.NonPublic |
+ BindingFlags.Public | BindingFlags.Instance,
+ null, this.PropertyType,
+ new Type[0], new ParameterModifier[0]);
if (_member == null)
throw new ArgumentException ("Accessor methods for the " + Name + " property are missing");
}
return _member;
- }
+ }
- public override Type ComponentType
- {
+ public override Type ComponentType {
get { return _componentType; }
}
- public override bool IsReadOnly
- {
- get
- {
- return !GetPropertyInfo ().CanWrite;
+ public override bool IsReadOnly {
+ get {
+ ReadOnlyAttribute attrib = ((ReadOnlyAttribute) Attributes[typeof (ReadOnlyAttribute)]);
+ return !GetPropertyInfo ().CanWrite || attrib.IsReadOnly;
}
}
- public override Type PropertyType
+ public override Type PropertyType {
+ get { return _propertyType; }
+ }
+
+ // The last added to the list attributes have higher precedence
+ //
+ protected override void FillAttributes (IList attributeList)
{
- get
- {
- return GetPropertyInfo ().PropertyType;
+ base.FillAttributes (attributeList);
+
+ if (!GetPropertyInfo ().CanWrite)
+ attributeList.Add (ReadOnlyAttribute.Yes);
+
+ // PropertyDescriptor merges the attributes of both virtual and also "new" properties
+ // in the the component type hierarchy.
+ //
+ int numberOfBaseTypes = 0;
+ Type baseType = this.ComponentType;
+ while (baseType != null && baseType != typeof (object)) {
+ numberOfBaseTypes++;
+ baseType = baseType.BaseType;
+ }
+
+ Attribute[][] hierarchyAttributes = new Attribute[numberOfBaseTypes][];
+ baseType = this.ComponentType;
+ while (baseType != null && baseType != typeof (object)) {
+ PropertyInfo property = baseType.GetProperty (Name, BindingFlags.NonPublic |
+ BindingFlags.Public | BindingFlags.Instance |
+ BindingFlags.DeclaredOnly,
+ null, this.PropertyType,
+ new Type[0], new ParameterModifier[0]);
+ if (property != null) {
+ object[] attrObjects = property.GetCustomAttributes (false);
+ Attribute[] attrsArray = new Attribute[attrObjects.Length];
+ attrObjects.CopyTo (attrsArray, 0);
+ // add in reverse order so that the base types have lower precedence
+ hierarchyAttributes[--numberOfBaseTypes] = attrsArray;
+ }
+ baseType = baseType.BaseType;
+ }
+
+ foreach (Attribute[] attrArray in hierarchyAttributes) {
+ if (attrArray != null) {
+ foreach (Attribute attr in attrArray)
+ attributeList.Add (attr);
+ }
}
+
+ foreach (Attribute attribute in TypeDescriptor.GetAttributes (PropertyType))
+ attributeList.Add (attribute);
}
-
+
public override object GetValue (object component)
{
- return GetPropertyInfo ().GetValue (component, null);
+ component = MemberDescriptor.GetInvokee (_componentType, component);
+ InitAccessors ();
+ return getter.GetValue (component, null);
}
-
- DesignerTransaction CreateTransaction (object obj)
+
+ DesignerTransaction CreateTransaction (object obj, string description)
{
IComponent com = obj as IComponent;
if (com == null || com.Site == null)
return null;
-
+
IDesignerHost dh = (IDesignerHost) com.Site.GetService (typeof(IDesignerHost));
if (dh == null)
return null;
-
- DesignerTransaction tran = dh.CreateTransaction ();
+
+ DesignerTransaction tran = dh.CreateTransaction (description);
IComponentChangeService ccs = (IComponentChangeService) com.Site.GetService (typeof(IComponentChangeService));
if (ccs != null)
ccs.OnComponentChanging (com, this);
return tran;
}
-
+
void EndTransaction (object obj, DesignerTransaction tran, object oldValue, object newValue, bool commit)
{
if (tran == null) {
OnValueChanged (obj, new PropertyChangedEventArgs (Name));
return;
}
-
+
if (commit) {
IComponent com = obj as IComponent;
IComponentChangeService ccs = (IComponentChangeService) com.Site.GetService (typeof(IComponentChangeService));
} else
tran.Cancel ();
}
-
+
+ /*
+ This method exists because reflection is way too low level for what we need.
+ A given virtual property that is partially overriden by a child won't show the
+ non-overriden accessor in PropertyInfo. IOW:
+ class Parent {
+ public virtual string Prop { get; set; }
+ }
+ class Child : Parent {
+ public override string Prop {
+ get { return "child"; }
+ }
+ }
+ PropertyInfo pi = typeof (Child).GetProperty ("Prop");
+ pi.GetGetMethod (); //returns the MethodInfo for the overridden getter
+ pi.GetSetMethod (); //returns null as no override exists
+ */
+ void InitAccessors () {
+ if (accessors_inited)
+ return;
+ PropertyInfo prop = GetPropertyInfo ();
+ MethodInfo setterMethod, getterMethod;
+ setterMethod = prop.GetSetMethod (true);
+ getterMethod = prop.GetGetMethod (true);
+
+ if (getterMethod != null)
+ getter = prop;
+
+ if (setterMethod != null)
+ setter = prop;
+
+
+ if (setterMethod != null && getterMethod != null) {//both exist
+ accessors_inited = true;
+ return;
+ }
+ if (setterMethod == null && getterMethod == null) {//neither exist, this is a broken property
+ accessors_inited = true;
+ return;
+ }
+
+ //In order to detect that this is a virtual property with override, we check the non null accessor
+ MethodInfo mi = getterMethod != null ? getterMethod : setterMethod;
+
+ if (mi == null || !mi.IsVirtual || (mi.Attributes & MethodAttributes.NewSlot) == MethodAttributes.NewSlot) {
+ accessors_inited = true;
+ return;
+ }
+
+ Type type = _componentType.BaseType;
+ while (type != null && type != typeof (object)) {
+ prop = type.GetProperty (Name, BindingFlags.GetProperty | BindingFlags.NonPublic |
+ BindingFlags.Public | BindingFlags.Instance,
+ null, this.PropertyType,
+ new Type[0], new ParameterModifier[0]);
+ if (prop == null) //nothing left to search
+ break;
+ if (setterMethod == null)
+ setterMethod = mi = prop.GetSetMethod ();
+ else
+ getterMethod = mi = prop.GetGetMethod ();
+
+ if (getterMethod != null && getter == null)
+ getter = prop;
+
+ if (setterMethod != null && setter == null)
+ setter = prop;
+
+ if (mi != null)
+ break;
+ type = type.BaseType;
+ }
+ accessors_inited = true;
+ }
+
public override void SetValue (object component, object value)
{
- DesignerTransaction tran = CreateTransaction (component);
- object old = GetValue (component);
+ DesignerTransaction tran = CreateTransaction (component, "Set Property '" + Name + "'");
+ object propertyHolder = MemberDescriptor.GetInvokee (_componentType, component);
+ object old = GetValue (propertyHolder);
+
try {
- GetPropertyInfo ().SetValue (component, value, null);
+ InitAccessors ();
+ setter.SetValue (propertyHolder, value, null);
EndTransaction (component, tran, old, value, true);
} catch {
EndTransaction (component, tran, old, value, false);
}
}
+ MethodInfo FindPropertyMethod (object o, string method_name)
+ {
+ MethodInfo mi = null;
+ string name = method_name + Name;
+
+ foreach (MethodInfo m in o.GetType().GetMethods (BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public)) {
+ // XXX should we really not check the return type of the method?
+ if (m.Name == name && m.GetParameters().Length == 0) {
+ mi = m;
+ break;
+ }
+ }
+
+ return mi;
+ }
+
public override void ResetValue (object component)
{
- DefaultValueAttribute attrib = ((DefaultValueAttribute) Attributes[typeof (DefaultValueAttribute)]);
- if (attrib != null)
- SetValue (component, attrib.Value);
-
- DesignerTransaction tran = CreateTransaction (component);
- object old = GetValue (component);
+ object propertyHolder = MemberDescriptor.GetInvokee (_componentType, component);
+ DefaultValueAttribute attrib = ((DefaultValueAttribute) Attributes[typeof (DefaultValueAttribute)]);
+ if (attrib != null)
+ SetValue (propertyHolder, attrib.Value);
+
+ DesignerTransaction tran = CreateTransaction (component, "Reset Property '" + Name + "'");
+ object old = GetValue (propertyHolder);
+
try {
- MethodInfo mi = component.GetType().GetMethod ("Reset" + Name, Type.EmptyTypes);
+ MethodInfo mi = FindPropertyMethod (propertyHolder, "Reset");
if (mi != null)
- mi.Invoke (component, null);
- EndTransaction (component, tran, old, GetValue (component), true);
+ mi.Invoke (propertyHolder, null);
+ EndTransaction (component, tran, old, GetValue (propertyHolder), true);
} catch {
- EndTransaction (component, tran, old, GetValue (component), false);
+ EndTransaction (component, tran, old, GetValue (propertyHolder), false);
throw;
}
}
public override bool CanResetValue (object component)
{
+ component = MemberDescriptor.GetInvokee (_componentType, component);
+
DefaultValueAttribute attrib = ((DefaultValueAttribute) Attributes[typeof (DefaultValueAttribute)]);
if (attrib != null) {
object current = GetValue (component);
return !attrib.Value.Equals (current);
} else {
- MethodInfo mi = component.GetType().GetMethod ("ShouldPersist" + Name, Type.EmptyTypes);
+#if NET_2_0
+ if (!_member.CanWrite)
+ return false;
+#endif
+ MethodInfo mi = FindPropertyMethod (component, "ShouldPersist");
if (mi != null)
return (bool) mi.Invoke (component, null);
- mi = component.GetType().GetMethod ("Reset" + Name, Type.EmptyTypes);
+
+ mi = FindPropertyMethod (component, "ShouldSerialize");
+ if (mi != null && !((bool) mi.Invoke (component, null)))
+ return false;
+
+ mi = FindPropertyMethod (component, "Reset");
return mi != null;
}
}
public override bool ShouldSerializeValue (object component)
{
+ component = MemberDescriptor.GetInvokee (_componentType, component);
+
+ if (IsReadOnly) {
+ MethodInfo mi = FindPropertyMethod (component, "ShouldSerialize");
+ if (mi != null)
+ return (bool) mi.Invoke (component, null);
+ return Attributes.Contains (DesignerSerializationVisibilityAttribute.Content);
+ }
+
DefaultValueAttribute attrib = ((DefaultValueAttribute) Attributes[typeof (DefaultValueAttribute)]);
if (attrib != null) {
object current = GetValue (component);
- if ((attrib.Value == null || current == null) && attrib.Value != current)
- return true;
+ if (attrib.Value == null || current == null)
+ return attrib.Value != current;
return !attrib.Value.Equals (current);
}
else {
- MethodInfo mi = component.GetType().GetMethod ("ShouldSerialize" + Name, Type.EmptyTypes);
+ MethodInfo mi = FindPropertyMethod (component, "ShouldSerialize");
if (mi != null)
return (bool) mi.Invoke (component, null);
+ // MSDN: If this method cannot find a DefaultValueAttribute or a ShouldSerializeMyProperty method,
+ // it cannot create optimizations and it returns true.
return true;
}
}
}
}
-
projects / mono.git / blobdiff