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//
// System.ComponentModel.ReferenceConverter.cs
//
// Authors:
// Martin Willemoes Hansen (mwh@sysrq.dk)
// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
// Ivan N. Zlatev (contact@i-nz.net)
//
// (C) 2003 Martin Willemoes Hansen
// (C) 2003 Andreas Nahr
//
// 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.Globalization;
using System.Collections;
using System.ComponentModel.Design;
namespace System.ComponentModel
{
public class ReferenceConverter : TypeConverter
{
private Type reference_type;
public ReferenceConverter (Type type)
{
reference_type = type;
}
public override bool CanConvertFrom (ITypeDescriptorContext context,
Type sourceType)
{
if (context != null && sourceType == typeof (string))
return true;
return base.CanConvertFrom (context, sourceType);
}
public override object ConvertFrom (ITypeDescriptorContext context,
CultureInfo culture,
object value)
{
if (!(value is string))
return base.ConvertFrom(context, culture, value);
if (context != null) {
object reference = null;
// try 1 - IReferenceService
IReferenceService referenceService = context.GetService (typeof (IReferenceService)) as IReferenceService;
if (referenceService != null)
reference = referenceService.GetReference ((string)value);
// try 2 - Component by name
if (reference == null) {
if (context.Container != null && context.Container.Components != null)
reference = context.Container.Components[(string)value];
}
return reference;
}
return null;
}
public override object ConvertTo (ITypeDescriptorContext context,
CultureInfo culture,
object value,
Type destinationType)
{
if (destinationType != typeof (string))
return base.ConvertTo(context, culture, value, destinationType);
if (value == null)
return "(none)";
string referenceName = String.Empty;
if (context != null) {
// try 1 - IReferenceService
IReferenceService referenceService = context.GetService (typeof (IReferenceService)) as IReferenceService;
if (referenceService != null)
referenceName = referenceService.GetName (value);
// try 2 - Component by name
if ((referenceName == null || referenceName.Length == 0) && value is IComponent) {
IComponent component = (IComponent) value;
if (component.Site != null && component.Site.Name != null)
referenceName = component.Site.Name;
}
}
return referenceName;
}
public override StandardValuesCollection GetStandardValues (ITypeDescriptorContext context)
{
ArrayList values = new ArrayList ();
if (context != null) {
IReferenceService referenceService = context.GetService (typeof (IReferenceService)) as IReferenceService;
if (referenceService != null) {
foreach (object reference in referenceService.GetReferences (reference_type)) {
if (IsValueAllowed (context, reference)) {
values.Add (reference);
}
}
} else {
if (context.Container != null && context.Container.Components != null) {
foreach (object component in context.Container.Components) {
// avoid duplicate null values here
if (component != null &&
IsValueAllowed (context, component) &&
reference_type.IsInstanceOfType (component))
values.Add (component);
}
}
}
values.Add (null);
}
return new StandardValuesCollection (values);
}
public override bool GetStandardValuesExclusive (ITypeDescriptorContext context)
{
return true;
}
public override bool GetStandardValuesSupported (ITypeDescriptorContext context)
{
return true;
}
protected virtual bool IsValueAllowed (ITypeDescriptorContext context, object value)
{
return true;
}
}
}
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