DependencyProperty.cs :  » 2.6.4-mono-.net-core » System.Windows » System » Windows » C# / CSharp Open Source

Home
C# / CSharp Open Source
1.2.6.4 mono .net core
2.2.6.4 mono core
3.Aspect Oriented Frameworks
4.Bloggers
5.Build Systems
6.Business Application
7.Charting Reporting Tools
8.Chat Servers
9.Code Coverage Tools
10.Content Management Systems CMS
11.CRM ERP
12.Database
13.Development
14.Email
15.Forum
16.Game
17.GIS
18.GUI
19.IDEs
20.Installers Generators
21.Inversion of Control Dependency Injection
22.Issue Tracking
23.Logging Tools
24.Message
25.Mobile
26.Network Clients
27.Network Servers
28.Office
29.PDF
30.Persistence Frameworks
31.Portals
32.Profilers
33.Project Management
34.RSS RDF
35.Rule Engines
36.Script
37.Search Engines
38.Sound Audio
39.Source Control
40.SQL Clients
41.Template Engines
42.Testing
43.UML
44.Web Frameworks
45.Web Service
46.Web Testing
47.Wiki Engines
48.Windows Presentation Foundation
49.Workflows
50.XML Parsers
C# / C Sharp
C# / C Sharp by API
C# / CSharp Tutorial
C# / CSharp Open Source » 2.6.4 mono .net core » System.Windows 
System.Windows » System » Windows » DependencyProperty.cs
//
// DependencyProperty.cs
//
// Author:
//   Iain McCoy (iain@mccoy.id.au)
//   Moonlight Team (moonlight-list@lists.ximian.com)
// 
//
// Copyright 2005 Iain McCoy
// Copyright 2007 Novell, Inc.
//
// 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 Mono;
using System.Collections.Generic;

namespace System.Windows{

  internal delegate void ValueValidator (DependencyObject target, DependencyProperty property, object value);
  
  public class DependencyProperty {

    static ValueValidator DefaultValidator = delegate { };
    
    string name;
    IntPtr native;
    Type property_type;
    Type declaring_type; 
    bool? attached;
    bool? hasHiddenDefaultValue;
    ValueValidator validator;
    internal PropertyChangedCallback property_changed_callback {
      get; private set;
    }
    
    static Dictionary <IntPtr, DependencyProperty> properties = new Dictionary<IntPtr, DependencyProperty> ();
    
    public static readonly object UnsetValue = new object ();
    
    internal DependencyProperty (IntPtr handle, string name, Type property_type, Type declaring_type)
    {
      this.native = handle;
      this.property_type = property_type;
      this.declaring_type = declaring_type;
      this.name = name;
      
      properties.Add (handle, this);

      //Console.WriteLine ("DependencyProperty.DependencyProperty ({0:X}, {1}, {2})", handle, property_type.FullName, declaring_type.FullName);
    }
    
    public PropertyMetadata GetMetadata (Type forType)
    {
      var kind = Deployment.Current.Types.TypeToNativeKind (forType);
      var defaultValue = UnsetValue;
      if (!HasHiddenDefaultValue)
        defaultValue = GetDefaultValue (kind) ?? UnsetValue;

      return new PropertyMetadata (defaultValue);
    }
    
    public static DependencyProperty Register (string name, Type propertyType, Type ownerType, PropertyMetadata typeMetadata)
    {
      return RegisterAny (name, propertyType, ownerType, typeMetadata, false, false, true, true);
    }
    
    internal static DependencyProperty RegisterCore (string name, Type propertyType, Type ownerType, PropertyMetadata typeMetadata)
    {
      return RegisterAny (name, propertyType, ownerType, typeMetadata, false, false, true, false);
    }
    
    public static DependencyProperty RegisterAttached (string name, Type propertyType, Type ownerType, PropertyMetadata defaultMetadata)
    {
      return RegisterAny (name, propertyType, ownerType, defaultMetadata, true, false, true, true);
    }
    
    internal static DependencyProperty RegisterAttachedCore (string name, Type propertyType, Type ownerType, PropertyMetadata defaultMetadata)
    {
      return RegisterAny (name, propertyType, ownerType, defaultMetadata, true, false, true, false);
    }

    // internally Silverlight use some read-only properties
    internal static DependencyProperty RegisterReadOnlyCore (string name, Type propertyType, Type ownerType, PropertyMetadata defaultMetadata)
    {
      return RegisterAny (name, propertyType, ownerType, defaultMetadata, true, true, true, false);
    }
    
    private static DependencyProperty RegisterAny (string name, Type propertyType, Type ownerType, PropertyMetadata metadata, bool attached, bool readOnly, bool setsParent, bool custom)
    {
      ManagedType property_type;
      ManagedType owner_type;
      UnmanagedPropertyChangeHandler handler = null;
      CustomDependencyProperty result;
      bool is_nullable = false;
      object default_value = DependencyProperty.UnsetValue;
      PropertyChangedCallback property_changed_callback = null;
      
      if (name == null)
        throw new ArgumentNullException ("name");
      
      if (name.Length == 0)
        throw new ArgumentException("The 'name' argument cannot be an empty string");
      
      if (propertyType == null)
        throw new ArgumentNullException ("propertyType");
      
      if (ownerType == null)
        throw new ArgumentNullException ("ownerType");

      if (propertyType.IsGenericType && propertyType.GetGenericTypeDefinition () == typeof (Nullable<>)) {
        is_nullable = true;
        // Console.WriteLine ("DependencyProperty.RegisterAny (): found nullable {0}, got nullable {1}", propertyType.FullName, propertyType.GetGenericArguments () [0].FullName);
        propertyType = propertyType.GetGenericArguments () [0];
      }
      
      Types types = Deployment.Current.Types;

      property_type = types.Find (propertyType);
      owner_type = types.Find (ownerType);

      if (metadata != null) {
        default_value = metadata.DefaultValue ?? UnsetValue;
        property_changed_callback = metadata.property_changed_callback;
      }

      if ((default_value == DependencyProperty.UnsetValue) && propertyType.IsValueType && !is_nullable)
        default_value = Activator.CreateInstance (propertyType);

      if (default_value != null && default_value != UnsetValue && !propertyType.IsAssignableFrom (default_value.GetType ()))
        throw new ArgumentException (string.Format ("DefaultValue is of type {0} which is not compatible with type {1}", default_value.GetType (), propertyType));

      if (property_changed_callback != null)
        handler = UnmanagedPropertyChangedCallbackSafe;

      Value v;
      if (default_value == DependencyProperty.UnsetValue) {
        v = new Value { k = types.TypeToKind (propertyType), IsNull = true };
        default_value = null;
      } else {
        v = Value.FromObject (default_value, false);
      }

      IntPtr handle;
      using (v) {
        var val = v;
        if (custom)
          handle = NativeMethods.dependency_property_register_custom_property (name, property_type.native_handle, owner_type.native_handle, ref val, attached, readOnly, handler);
        else
          handle = NativeMethods.dependency_property_register_core_property (name, property_type.native_handle, owner_type.native_handle, ref val, attached, readOnly, handler);
      }
      
      if (handle == IntPtr.Zero)
        return null;

      if (is_nullable)
        NativeMethods.dependency_property_set_is_nullable (handle, true);
      
      result = new CustomDependencyProperty (handle, name, property_type, owner_type);
      result.attached = attached;
      result.PropertyChangedHandler = handler;
      result.property_changed_callback = property_changed_callback;
      
      return result;
    }

    private static void UnmanagedPropertyChangedCallbackSafe (IntPtr dependency_object, IntPtr propertyChangeArgs, ref MoonError error, IntPtr unused)
    {
      try {
        try {
          UnmanagedPropertyChangedCallback (dependency_object,
                    NativeMethods.property_changed_event_args_get_property (propertyChangeArgs),
                    NativeMethods.property_changed_event_args_get_old_value (propertyChangeArgs),
                    NativeMethods.property_changed_event_args_get_new_value (propertyChangeArgs));
        } catch (Exception ex) {
          error = new MoonError (ex);
        }
      } catch (Exception ex) {
        try {
          Console.WriteLine ("Moonlight: Unhandled exception in DependencyProperty.UnmanagedPropertyChangedCallback: {0}",
                 ex.Message);
        } catch {
        }
      }
    }
    
    private static void UnmanagedPropertyChangedCallback (IntPtr dependency_object, IntPtr dependency_property, IntPtr old_value, IntPtr new_value)
    {    
      DependencyProperty property;
      CustomDependencyProperty custom_property;
      DependencyObject obj;
      object old_obj, new_obj;
      
      if (!properties.TryGetValue (dependency_property, out property)) {
        Console.Error.WriteLine ("DependencyProperty.UnmanagedPropertyChangedCallback: Couldn't find the managed DependencyProperty corresponding with native {0}", dependency_property);
        return;
      }
      
      custom_property = property as CustomDependencyProperty;
      
      if (custom_property == null) {
        Console.Error.WriteLine ("DependencyProperty.UnmanagedPropertyChangedCallback: Got the event for a builtin dependency property.");
        return;
      }

      // Console.WriteLine ("UnmanagedPropertyChangedCallback {3} {2} {0} {1}", old_value, new_value, custom_property.name, custom_property.property_type.FullName);
      
      if (custom_property.property_changed_callback == null)
        return;        

      obj = NativeDependencyObjectHelper.Lookup (dependency_object) as DependencyObject;
      
      if (obj == null)
        return;
      
      old_obj = Value.ToObject (property.property_type, old_value);
      new_obj = Value.ToObject (property.property_type, new_value);
      
      InvokeChangedCallback (obj, property, custom_property.property_changed_callback, old_obj, new_obj);
    }

    static void InvokeChangedCallback (DependencyObject obj, DependencyProperty property, PropertyChangedCallback callback,
               object old_obj, object new_obj)
    {
      DependencyPropertyChangedEventArgs args;

      if (old_obj == null && property.property_type.IsValueType && !property.IsNullable)
        old_obj = property.GetDefaultValue (obj);
      
      if (old_obj == null && new_obj == null)
        return; // Nothing changed.
      
      if (old_obj == new_obj)
        return; // Nothing changed
      
      if (old_obj != null && new_obj != null)
        if (object.Equals (old_obj, new_obj))
          return; // Nothing changed
      
      args = new DependencyPropertyChangedEventArgs (old_obj, new_obj, property);

      // note: since callbacks might throw exceptions but we cannot catch them
      callback (obj, args);
    }

    internal static DependencyProperty Lookup (IntPtr native)
    {
      DependencyProperty prop;
      return properties.TryGetValue (native, out prop) ? prop : null;
    }

    internal static DependencyProperty Lookup (Kind declaring_kind, string name)
    {
      return Lookup (declaring_kind, name, null, false);
    }

    internal static DependencyProperty Lookup (Kind declaring_kind, string name, Type property_type)
    {
      return Lookup (declaring_kind, name, property_type, true);
    }

    private static DependencyProperty Lookup (Kind declaring_kind, string name, Type property_type, bool create)
    {
      DependencyProperty prop;
      if (!LookupInternal (declaring_kind, name, property_type, create, out prop)) {
        throw new Exception (
          String.Format ("DependencyProperty.Lookup: {0} lacks {1}. This is normally " +
                   "because System.Windows.dll libmoon is out of sync. " + 
                   "Update /moon and do 'make generate' in moon/tools/generators and then " +
                   "'make all install' in moon/ to fix it.", Deployment.Current.Types.KindToType (declaring_kind), name));
      }
      return prop;
    }

    private static bool LookupInternal (Kind declaring_kind, string name, Type property_type, bool create, out DependencyProperty property)
    {
      IntPtr handle;

      if (name == null)
        throw new ArgumentNullException ("name");

      if (create && property_type == null)
        throw new ArgumentNullException ("property_type");  
      
      if (declaring_kind == Kind.INVALID)
        throw new ArgumentOutOfRangeException ("declaring_kind");

      if (property_type != null)
        Deployment.Current.Types.Find (property_type);

      handle = NativeMethods.dependency_property_get_dependency_property_full (declaring_kind, name, true);

      if (handle == IntPtr.Zero) {
        property = null;
        return false;
      }
      if (properties.TryGetValue (handle, out property))
        return true;

      if (create) {
        property = new DependencyProperty (handle, name, property_type, Deployment.Current.Types.KindToType (declaring_kind));
      }

      return property != null;
    }

    internal static bool TryLookup (Kind declaring_kind, string name, out DependencyProperty property)
    {
      return LookupInternal (declaring_kind, name, null, false, out property);
    }

    internal PropertyChangedCallback change_cb;

    internal void AddPropertyChangeCallback (PropertyChangedCallback callback)
    {
      if (this is CustomDependencyProperty) {
        Console.WriteLine ("this should really just be done by registering the property with metadata");
        CustomDependencyProperty cdp = (CustomDependencyProperty)this;
        if (cdp.property_changed_callback != null)
          throw new InvalidOperationException ("this DP was registered with a PropertyChangedCallback already");
      }

      if (change_cb != null)
        throw new InvalidOperationException ("this DP already has a change callback registered");

      change_cb = callback;

      NativeMethods.dependency_property_set_property_changed_callback (native,
                       CustomUnmanagedPropertyChangedCallbackSafe);
    }

    private static void CustomUnmanagedPropertyChangedCallbackSafe (IntPtr dependency_object, IntPtr propertyChangeArgs, ref MoonError error, IntPtr unused)
    {
      DependencyProperty property;
      DependencyObject obj;

      try {
        try {
          IntPtr uprop = NativeMethods.property_changed_event_args_get_property (propertyChangeArgs);
          if (!properties.TryGetValue (uprop, out property)) {
            Console.Error.WriteLine ("DependencyProperty.CustomUnmanagedPropertyChangedCallback: Couldn't find the managed DependencyProperty corresponding with native {0}/{1}", uprop, NativeMethods.property_changed_event_args_get_id (propertyChangeArgs));
            return;
          }

          obj = NativeDependencyObjectHelper.Lookup (dependency_object) as DependencyObject;
      
          if (obj == null)
            return;

          InvokeChangedCallback (obj, property, property.change_cb,
                 Value.ToObject (property.PropertyType, NativeMethods.property_changed_event_args_get_old_value (propertyChangeArgs)),
                 Value.ToObject (property.PropertyType, NativeMethods.property_changed_event_args_get_new_value (propertyChangeArgs)));
        } catch (Exception ex) {
          error = new MoonError (ex);
        }
      } catch (Exception ex) {
        try {
          Console.WriteLine ("Moonlight: Unhandled exception in DependencyProperty.UnmanagedPropertyChangedCallback: {0}", ex.Message);
        } catch {
        }
      }
    }

    bool HasHiddenDefaultValue {
      get {
        if (!hasHiddenDefaultValue.HasValue)
          hasHiddenDefaultValue = Mono.NativeMethods.dependency_property_get_has_hidden_default_value (native);
        return hasHiddenDefaultValue.Value;
      }
    }

    internal string Name {
      get { return name; }
    }
    
    internal bool IsAttached {
      get {
        if (!attached.HasValue)
          attached = NativeMethods.dependency_property_is_attached (native);
        return attached.Value;
      }
    }

    private bool boxValueTypes = true;
    internal bool BoxValueTypes {
      get { return boxValueTypes; }
      set { boxValueTypes = value; }
    }

    internal bool IsNullable {
      get { return NativeMethods.dependency_property_is_nullable (native); }
    }
        
    internal bool IsValueType {
      get { return NativeMethods.type_get_value_type (Deployment.Current.Types.TypeToKind (PropertyType)); }
    }
    
    internal Type DeclaringType {
      get { return declaring_type; }
    }
    
    internal object GetDefaultValue (object ob)
    {
      return GetDefaultValue (Deployment.Current.Types.TypeToNativeKind (ob.GetType ()));
    }
    
    internal object GetDefaultValue (Kind kind)
    {
      var ptr = Mono.NativeMethods.dependency_property_get_default_value (native, kind);
      var result = Value.ToObject (PropertyType, ptr);
      Mono.NativeMethods.value_free_value2 (ptr);
      return result;
    }

    internal IntPtr Native {
      get { return native; }
    }
    
    internal Type PropertyType {
      get { return property_type; }
    }

    internal bool IsReadOnly {
      get { return NativeMethods.dependency_property_is_read_only (native); }
    }

    internal ValueValidator Validate {
      get { return validator ?? DefaultValidator; }
      set { validator = value; }
    }
  }
}
www.java2v.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.