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/*
* EditorManager.cs - Used to register, lookup and select visual editors.
*
* Part of PropertyGrid - A Gtk# widget that displays and allows
* editing of all of an object's public properties
*
* Authors:
* Michael Hutchinson <m.j.hutchinson@gmail.com>
* Lluis Sanchez Gual
*
* Copyright (C) 2005 Michael Hutchinson
*
* This sourcecode is licenced under The MIT License:
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* 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 NONINFRINGEMENT. IN
* NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Reflection;
using MonoDevelop.Components.PropertyGrid.PropertyEditors;
namespace MonoDevelop.Components.PropertyGrid
{
class EditorManager
{
readonly Dictionary<Type,Type> editors = new Dictionary<Type,Type> ();
readonly Dictionary<Type,Type> inheritingEditors = new Dictionary<Type, Type>();
readonly Dictionary<Type,Type> surrogates = new Dictionary<Type,Type> ();
static readonly PropertyEditorCell Default = new PropertyEditorCell ();
static readonly Dictionary<Type,PropertyEditorCell> cellCache = new Dictionary<Type,PropertyEditorCell> ();
public EditorManager ()
{
LoadEditor (Assembly.GetAssembly (typeof (EditorManager)));
}
public void LoadEditor (Assembly editorAssembly)
{
foreach (Type t in editorAssembly.GetTypes ()) {
foreach (Attribute currentAttribute in Attribute.GetCustomAttributes (t)) {
if (currentAttribute.GetType() == typeof (PropertyEditorTypeAttribute)) {
var peta = (PropertyEditorTypeAttribute)currentAttribute;
Type editsType = peta.Type;
if (t.IsSubclassOf (typeof (PropertyEditorCell)))
if (peta.Inherits)
inheritingEditors.Add (editsType, t);
else
editors.Add (editsType, t);
}
else if (currentAttribute.GetType () == typeof (SurrogateUITypeEditorAttribute)) {
Type editsType = (currentAttribute as SurrogateUITypeEditorAttribute).Type;
surrogates.Add (editsType, t);
}
}
}
}
public PropertyEditorCell GetEditor (ITypeDescriptorContext context)
{
var cell = context.PropertyDescriptor.GetEditor (typeof(PropertyEditorCell)) as PropertyEditorCell;
if (cell != null)
return cell;
Type editorType = GetEditorType (context);
if (editorType == null)
return Default;
if (typeof(IPropertyEditor).IsAssignableFrom (editorType)) {
if (!typeof(Gtk.Widget).IsAssignableFrom (editorType))
throw new Exception ("The property editor '" + editorType + "' must be a Gtk Widget");
return Default;
}
if (cellCache.TryGetValue (editorType, out cell)) {
return cell;
}
if (!typeof(PropertyEditorCell).IsAssignableFrom (editorType))
throw new Exception ("The property editor '" + editorType + "' must be a subclass of Stetic.PropertyEditorCell or implement Stetic.IPropertyEditor");
cell = (PropertyEditorCell) Activator.CreateInstance (editorType);
cellCache [editorType] = cell;
return cell;
}
public Type GetEditorType (ITypeDescriptorContext context)
{
var pd = context.PropertyDescriptor;
//try to find a custom editor
//TODO: Find a way to provide a IWindowsFormsEditorService so this can work directly
//for now, substitute GTK#-based editors
/*
UITypeEditor UITypeEd = (UITypeEditor) pd.GetEditor(typeof (System.Drawing.Design.UITypeEditor));//first, does it have custom editors?
if (UITypeEd != null)
if (surrogates.Contains(UITypeEd.GetType ()))
return instantiateEditor((Type) surrogates[UITypeEd.GetType()], parentRow);
*/
//does a registered GTK# editor support this natively?
Type editType = pd.PropertyType;
if (editors.ContainsKey (editType))
return editors [editType];
//editors that edit derived types
//TODO: find most derived type?
foreach (var kvp in inheritingEditors)
if (editType.IsSubclassOf (kvp.Key))
return kvp.Value;
if (pd.PropertyType.IsEnum) {
if (pd.PropertyType.IsDefined (typeof(FlagsAttribute), true))
return typeof(FlagsEditorCell);
return typeof(EnumerationEditorCell);
}
//collections with items of single type that aren't just objects
if (typeof(System.Collections.IList).IsAssignableFrom (editType)) {
// Iterate through all properties since there may be more than one indexer.
if (GetCollectionItemType (editType) != null)
return typeof (CollectionEditor);
}
//TODO: support simple SWF collection editor derivatives that just override Types available
// and reflect protected Type[] NewItemTypes {get;} to get types
//if (UITypeEd is System.ComponentModel.Design.CollectionEditor)
// ((System.ComponentModel.Design.CollectionEditor)UITypeEd).
//can we use a type converter with a built-in editor?
TypeConverter tc = pd.Converter;
//TODO: find best match, not first
foreach (var kvp in editors)
if (tc.CanConvertFrom (kvp.Key) && tc.CanConvertTo (kvp.Key))
return kvp.Value;
foreach (var kvp in inheritingEditors)
if (tc.CanConvertFrom (kvp.Key) && tc.CanConvertTo (kvp.Key))
return kvp.Value;
if (tc.CanConvertTo (typeof(string)) || tc.GetStandardValuesSupported (context)) {
return typeof(PropertyTextEditor);
}
//nothing found - just display type
return null;
}
public static Type GetCollectionItemType (Type colType)
{
foreach (PropertyInfo member in colType.GetProperties ()) {
if (member.Name == "Item") {
if (member.PropertyType != typeof (object))
return member.PropertyType;
}
}
return null;
}
}
}
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