COM2IVsPerPropertyBrowsingHandler.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / ComponentModel / COM2Interop / COM2IVsPerPropertyBrowsingHandler.cs / 1305376 / COM2IVsPerPropertyBrowsingHandler.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Windows.Forms.ComponentModel.Com2Interop { 
    using System; 
    using System.ComponentModel;
    using System.Diagnostics; 
    using System.Globalization;
    using Microsoft.Win32;

    ///  
    /// 
    /// This is the base class for handlers for Com2 extended browsing interface 
    /// such as IPerPropertyBrowsing, etc. 
    ///
    /// These handlers should be stateless.  That is, they should keep no refs to object 
    /// and should only work on a give object and dispid.  That way all objects that
    /// support a give interface can share a handler.
    ///
    /// See Com2Properties for the array of handler classes to interface classes 
    /// where handlers should be registered.
    ///  
    [System.Security.SuppressUnmanagedCodeSecurityAttribute()] 
    internal class Com2IVsPerPropertyBrowsingHandler: Com2ExtendedBrowsingHandler {
 
         /// 
         /// 
         /// The interface that this handler managers
         /// such as IPerPropertyBrowsing, IProvidePropertyBuilder, etc. 
         /// 
         public override Type Interface { 
            get { 
               return typeof(NativeMethods.IVsPerPropertyBrowsing);
            } 
         }

         public static bool AllowChildProperties(Com2PropertyDescriptor propDesc) {
            if (propDesc.TargetObject is NativeMethods.IVsPerPropertyBrowsing) { 
               bool pfHide = false;
               int hr = ((NativeMethods.IVsPerPropertyBrowsing)propDesc.TargetObject).DisplayChildProperties(propDesc.DISPID, ref pfHide); 
               return (hr == NativeMethods.S_OK && pfHide); 
            }
            return false; 
         }

         /// 
         ///  
         /// Called to setup the property handlers on a given properties
         /// In this method, the handler will add listeners to the events that 
         /// the Com2PropertyDescriptor surfaces that it cares about. 
         /// 
         public override void SetupPropertyHandlers(Com2PropertyDescriptor[] propDesc){ 
               if (propDesc == null){
                  return;
               }
               for (int i = 0; i < propDesc.Length; i++){ 
                  propDesc[i].QueryGetDynamicAttributes += new GetAttributesEventHandler(this.OnGetDynamicAttributes);
                  propDesc[i].QueryGetBaseAttributes += new GetAttributesEventHandler(this.OnGetBaseAttributes); 
                  propDesc[i].QueryGetDisplayName += new GetNameItemEventHandler(this.OnGetDisplayName); 
                  propDesc[i].QueryGetIsReadOnly += new GetBoolValueEventHandler(this.OnGetIsReadOnly);
 
                  propDesc[i].QueryShouldSerializeValue += new GetBoolValueEventHandler(this.OnShouldSerializeValue);
                  propDesc[i].QueryCanResetValue += new GetBoolValueEventHandler(this.OnCanResetPropertyValue);
                  propDesc[i].QueryResetValue += new Com2EventHandler(this.OnResetPropertyValue);
 
                  propDesc[i].QueryGetTypeConverterAndTypeEditor += new GetTypeConverterAndTypeEditorEventHandler(this.OnGetTypeConverterAndTypeEditor);
 
               } 
         }
 
         private void OnGetBaseAttributes(Com2PropertyDescriptor sender, GetAttributesEvent attrEvent){
             NativeMethods.IVsPerPropertyBrowsing vsObj = sender.TargetObject as NativeMethods.IVsPerPropertyBrowsing;

             if (vsObj == null) { 
                 return;
             } 
 
             // should we localize this?
             string[] pHelpString = new string[1]; 
             int hr = vsObj.GetLocalizedPropertyInfo(sender.DISPID, CultureInfo.CurrentCulture.LCID, null, pHelpString);
             if (hr == NativeMethods.S_OK && pHelpString[0] != null){
                attrEvent.Add(new DescriptionAttribute(pHelpString[0]));
             } 
         }
 
 
         /// 
         ///  
         /// Here is where we handle IVsPerPropertyBrowsing.GetLocalizedPropertyInfo and IVsPerPropertyBrowsing.   HideProperty
         /// such as IPerPropertyBrowsing, IProvidePropertyBuilder, etc.
         /// 
         private void OnGetDynamicAttributes(Com2PropertyDescriptor sender, GetAttributesEvent attrEvent){ 

               if (sender.TargetObject is NativeMethods.IVsPerPropertyBrowsing){ 
                  NativeMethods.IVsPerPropertyBrowsing vsObj = (NativeMethods.IVsPerPropertyBrowsing)sender.TargetObject; 

                  int hr = NativeMethods.S_OK; 

                  // we want to avoid allowing clients to force a bad property to be browsable,
                  // so we don't allow things that are marked as non browsable to become browsable,
                  // only the other way around. 
                  //
                  if (sender.CanShow) { 
                    // should we hide this? 
                    bool pfHide = sender.Attributes[typeof(BrowsableAttribute)].Equals(BrowsableAttribute.No);
 
                    hr = vsObj.HideProperty(sender.DISPID, ref pfHide);
                    if (hr == NativeMethods.S_OK){
                         attrEvent.Add(pfHide ? BrowsableAttribute.No : BrowsableAttribute.Yes);
                    } 
                  }
 
                  // should we show this 
                  if (typeof(UnsafeNativeMethods.IDispatch).IsAssignableFrom(sender.PropertyType) && sender.CanShow){
                     bool pfDisplay = false; 
                     hr = vsObj.DisplayChildProperties(sender.DISPID, ref pfDisplay);
                     if (hr == NativeMethods.S_OK && pfDisplay){
                           attrEvent.Add(BrowsableAttribute.Yes);
                     } 
                  }
               } 
               Debug.Assert(sender.TargetObject == null || sender.TargetObject is NativeMethods.IVsPerPropertyBrowsing, "Object is not " + Interface.Name + "!"); 
         }
 
         private void OnCanResetPropertyValue(Com2PropertyDescriptor sender, GetBoolValueEvent boolEvent) {
               if (sender.TargetObject is NativeMethods.IVsPerPropertyBrowsing) {
                    NativeMethods.IVsPerPropertyBrowsing target = (NativeMethods.IVsPerPropertyBrowsing)sender.TargetObject;
                    bool canReset = boolEvent.Value; 
                    int hr = target.CanResetPropertyValue(sender.DISPID, ref canReset);
 
                    if (NativeMethods.Succeeded(hr)){ 
                        boolEvent.Value = canReset;
                    } 
               }
               Debug.Assert(sender.TargetObject == null || sender.TargetObject is NativeMethods.IVsPerPropertyBrowsing, "Object is not " + Interface.Name + "!");
         }
 
         /// 
         ///  
         /// Here is where we handle IVsPerPropertyBrowsing.GetLocalizedPropertyInfo (part 2) 
         /// 
         private void OnGetDisplayName(Com2PropertyDescriptor sender, GetNameItemEvent nameItem){ 
               if (sender.TargetObject is NativeMethods.IVsPerPropertyBrowsing){
                  NativeMethods.IVsPerPropertyBrowsing vsObj = (NativeMethods.IVsPerPropertyBrowsing)sender.TargetObject;

                  // get the localized name, if applicable 
                  string[] pNameString = new string[1];
                  int hr = vsObj.GetLocalizedPropertyInfo(sender.DISPID, CultureInfo.CurrentCulture.LCID, pNameString, null); 
                  if (hr == NativeMethods.S_OK && pNameString[0] != null){ 
                     nameItem.Name = pNameString[0];
                  } 
               }
               Debug.Assert(sender.TargetObject == null || sender.TargetObject is NativeMethods.IVsPerPropertyBrowsing, "Object is not " + Interface.Name + "!");
         }
 
         /// 
         ///  
         /// Here is where we handle IVsPerPropertyBrowsing.IsPropertyReadOnly 
         /// 
         private void OnGetIsReadOnly(Com2PropertyDescriptor sender, GetBoolValueEvent gbvevent){ 
               if (sender.TargetObject is NativeMethods.IVsPerPropertyBrowsing){
                  NativeMethods.IVsPerPropertyBrowsing vsObj = (NativeMethods.IVsPerPropertyBrowsing)sender.TargetObject;

                  // should we make this read only? 
                  bool pfResult = false;
                  int hr = vsObj.IsPropertyReadOnly(sender.DISPID, ref pfResult); 
 
                  if (hr == NativeMethods.S_OK){
                     gbvevent.Value = pfResult; 
                  }
               }
         }
 
         /// 
         ///  
         /// Here is where we handle IVsPerPropertyBrowsing.DisplayChildProperties 
         /// 
         private void OnGetTypeConverterAndTypeEditor(Com2PropertyDescriptor sender, GetTypeConverterAndTypeEditorEvent gveevent) { 
            if (sender.TargetObject is NativeMethods.IVsPerPropertyBrowsing){

                  // we only do this for IDispatch types
                  if (sender.CanShow && typeof(UnsafeNativeMethods.IDispatch).IsAssignableFrom(sender.PropertyType)){ 
                     NativeMethods.IVsPerPropertyBrowsing vsObj = (NativeMethods.IVsPerPropertyBrowsing)sender.TargetObject;
 
                     // should we make this read only? 
                     bool pfResult = false;
                     int hr = vsObj.DisplayChildProperties(sender.DISPID, ref pfResult); 

                     if (gveevent.TypeConverter is Com2IDispatchConverter){
                        gveevent.TypeConverter = new Com2IDispatchConverter(sender, (hr == NativeMethods.S_OK && pfResult));
                     } 
                     else{
                        gveevent.TypeConverter = new Com2IDispatchConverter(sender, (hr == NativeMethods.S_OK && pfResult), gveevent.TypeConverter); 
                     } 
                  }
               } 
               Debug.Assert(sender.TargetObject == null || sender.TargetObject is NativeMethods.IVsPerPropertyBrowsing, "Object is not " + Interface.Name + "!");
         }

         private void OnResetPropertyValue(Com2PropertyDescriptor sender, EventArgs e) { 
               if (sender.TargetObject is NativeMethods.IVsPerPropertyBrowsing) {
 
 
                    NativeMethods.IVsPerPropertyBrowsing target = (NativeMethods.IVsPerPropertyBrowsing)sender.TargetObject;
                    int dispid = sender.DISPID; 
                    bool canReset = false;
                    int hr = target.CanResetPropertyValue(dispid, ref canReset);

                    if (NativeMethods.Succeeded(hr)){ 
                        target.ResetPropertyValue(dispid);
                    } 
               } 
               Debug.Assert(sender.TargetObject == null || sender.TargetObject is NativeMethods.IVsPerPropertyBrowsing, "Object is not " + Interface.Name + "!");
         } 

         private void OnShouldSerializeValue(Com2PropertyDescriptor sender, GetBoolValueEvent gbvevent){
               if (sender.TargetObject is NativeMethods.IVsPerPropertyBrowsing){
                     NativeMethods.IVsPerPropertyBrowsing vsObj = (NativeMethods.IVsPerPropertyBrowsing)sender.TargetObject; 

                     // by default we say it's default 
                     bool pfResult = true; 
                     int hr = vsObj.HasDefaultValue(sender.DISPID,ref pfResult);
 
                     if (hr == NativeMethods.S_OK && !pfResult){
                        // specify a default value editor
                        gbvevent.Value = true;
                     } 
               }
               Debug.Assert(sender.TargetObject == null || sender.TargetObject is NativeMethods.IVsPerPropertyBrowsing, "Object is not " + Interface.Name + "!"); 
         } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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