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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / ComponentModel / COM2Interop / COM2AboutBoxPropertyDescriptor.cs / 1305376 / COM2AboutBoxPropertyDescriptor.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms.ComponentModel.Com2Interop { using System.Runtime.Serialization.Formatters; using System.Runtime.InteropServices; using System.ComponentModel; using System.Diagnostics; using System.Diagnostics.CodeAnalysis; using System; using System.ComponentModel.Design; using Microsoft.Win32; using System.Collections; using System.Drawing.Design; internal class Com2AboutBoxPropertyDescriptor : Com2PropertyDescriptor { private TypeConverter converter; private UITypeEditor editor; public Com2AboutBoxPropertyDescriptor() : base(NativeMethods.ActiveX.DISPID_ABOUTBOX, "About", new Attribute[]{new DispIdAttribute(NativeMethods.ActiveX.DISPID_ABOUTBOX), DesignerSerializationVisibilityAttribute.Hidden, new DescriptionAttribute(SR.GetString(SR.AboutBoxDesc)), new ParenthesizePropertyNameAttribute(true)}, true, typeof(string), null, false) { } ////// /// Retrieves the type of the component this PropertyDescriptor is bound to. /// public override Type ComponentType { get { return typeof(UnsafeNativeMethods.IDispatch); } } ////// /// Retrieves the type converter for this property. /// public override TypeConverter Converter { get { if (converter == null) { converter = new TypeConverter(); } return converter; } } ////// /// Indicates whether this property is read only. /// public override bool IsReadOnly { get { return true; } } ////// /// Retrieves the type of the property. /// public override Type PropertyType { get { return typeof(string); } } ////// /// Indicates whether reset will change the value of the component. If there /// is a DefaultValueAttribute, then this will return true if getValue returns /// something different than the default value. If there is a reset method and /// a shouldPersist method, this will return what shouldPersist returns. /// If there is just a reset method, this always returns true. If none of these /// cases apply, this returns false. /// public override bool CanResetValue(object component) { return false; } ////// /// Retrieves an editor of the requested type. /// public override object GetEditor(Type editorBaseType) { if (editorBaseType == typeof(UITypeEditor)) { if (editor == null) { editor = new AboutBoxUITypeEditor(); } } return editor; } ////// /// Retrieves the current value of the property on component, /// invoking the getXXX method. An exception in the getXXX /// method will pass through. /// public override object GetValue(object component) { return ""; } ////// /// Will reset the default value for this property on the component. If /// there was a default value passed in as a DefaultValueAttribute, that /// value will be set as the value of the property on the component. If /// there was no default value passed in, a ResetXXX method will be looked /// for. If one is found, it will be invoked. If one is not found, this /// is a nop. /// public override void ResetValue(object component){ } ////// /// This will set value to be the new value of this property on the /// component by invoking the setXXX method on the component. If the /// value specified is invalid, the component should throw an exception /// which will be passed up. The component designer should design the /// property so that getXXX following a setXXX should return the value /// passed in if no exception was thrown in the setXXX call. /// [SuppressMessage("Microsoft.Usage", "CA2208:InstantiateArgumentExceptionsCorrectly")] public override void SetValue(object component, object value) { throw new ArgumentException(); } ////// /// Indicates whether the value of this property needs to be persisted. In /// other words, it indicates whether the state of the property is distinct /// from when the component is first instantiated. If there is a default /// value specified in this PropertyDescriptor, it will be compared against the /// property's current value to determine this. If there is't, the /// shouldPersistXXX method is looked for and invoked if found. If both /// these routes fail, true will be returned. /// /// If this returns false, a tool should not persist this property's value. /// public override bool ShouldSerializeValue(object component) { return false; } public class AboutBoxUITypeEditor : UITypeEditor { ////// /// Edits the given object value using the editor style provided by /// GetEditorStyle. A service provider is provided so that any /// required editing services can be obtained. /// public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value) { object component = context.Instance; if (Marshal.IsComObject(component) && component is UnsafeNativeMethods.IDispatch) { UnsafeNativeMethods.IDispatch pDisp = (UnsafeNativeMethods.IDispatch)component; NativeMethods.tagEXCEPINFO pExcepInfo = new NativeMethods.tagEXCEPINFO(); Guid g = Guid.Empty; int hr = pDisp.Invoke(NativeMethods.ActiveX.DISPID_ABOUTBOX, ref g, SafeNativeMethods.GetThreadLCID(), NativeMethods.DISPATCH_METHOD, new NativeMethods.tagDISPPARAMS(), null, pExcepInfo, null); Debug.Assert(NativeMethods.Succeeded(hr), "Failed to launch about box."); } return value; } ////// /// Retrieves the editing style of the Edit method. If the method /// is not supported, this will return None. /// public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context) { return UITypeEditorEditStyle.Modal; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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