/// <summary>
/// Returns true if the guid passed in has impact on geometry of the stroke
/// </summary>
internal static bool IsGeometricalDaGuid(Guid guid)
{
// Assert it is a DA guid
System.Diagnostics.Debug.Assert(null != DrawingAttributes.GetDefaultDrawingAttributeValue(guid));
if (guid == KnownIds.StylusHeight || guid == KnownIds.StylusWidth ||
guid == KnownIds.StylusTipTransform || guid == KnownIds.StylusTip ||
guid == KnownIds.DrawingFlags)
{
return(true);
}
return(false);
}
/// <summary>
/// All DrawingAttributes are backed by an ExtendedProperty
/// this is a simple helper to set a property
/// </summary>
/// <param name="id">id</param>
/// <returns></returns>
private object GetExtendedPropertyBackedProperty(Guid id)
{
if (!_extendedProperties.Contains(id))
{
if (null != DrawingAttributes.GetDefaultDrawingAttributeValue(id))
{
return(DrawingAttributes.GetDefaultDrawingAttributeValue(id));
}
throw new ArgumentException(SR.Get(SRID.EPGuidNotFound), "id");
}
else
{
return(_extendedProperties[id]);
}
}
/// <summary>
/// All DrawingAttributes are backed by an ExtendedProperty
/// this is a simple helper to set a property
/// </summary>
/// <param name="id">id</param>
/// <param name="value">value</param>
private void SetExtendedPropertyBackedProperty(Guid id, object value)
{
if (_extendedProperties.Contains(id))
{
//
// check to see if we're setting the property back
// to a default value. If we are we should remove it from
// the EPC
//
object defaultValue = DrawingAttributes.GetDefaultDrawingAttributeValue(id);
if (defaultValue != null)
{
if (defaultValue.Equals(value))
{
_extendedProperties.Remove(id);
return;
}
}
//
// we're setting a non-default value on a EP that
// already exists, check for equality before we do
// so we don't raise unnecessary EPC changed events
//
object o = GetExtendedPropertyBackedProperty(id);
if (!o.Equals(value))
{
_extendedProperties[id] = value;
}
}
else
{
//
// make sure we're not setting a default value of the guid
// there is no need to do this
//
object defaultValue = DrawingAttributes.GetDefaultDrawingAttributeValue(id);
if (defaultValue == null || !defaultValue.Equals(value))
{
_extendedProperties[id] = value;
}
}
}
/// <summary>
/// Whenever the base class fires the generic ExtendedPropertiesChanged
/// event, we need to fire the DrawingAttributesChanged event also.
/// </summary>
/// <param name="sender">Should be 'this' object</param>
/// <param name="args">The custom attributes that changed</param>
private void ExtendedPropertiesChanged_EventForwarder(object sender, ExtendedPropertiesChangedEventArgs args)
{
System.Diagnostics.Debug.Assert(sender != null);
System.Diagnostics.Debug.Assert(args != null);
//see if the EP that changed is a drawingattribute
if (args.NewProperty == null)
{
//a property was removed, see if it is a drawing attribute property
object defaultValueIfDrawingAttribute
= DrawingAttributes.GetDefaultDrawingAttributeValue(args.OldProperty.Id);
if (defaultValueIfDrawingAttribute != null)
{
ExtendedProperty newProperty =
new ExtendedProperty(args.OldProperty.Id,
defaultValueIfDrawingAttribute);
//this is a da guid
PropertyDataChangedEventArgs dargs =
new PropertyDataChangedEventArgs(args.OldProperty.Id,
newProperty.Value, //the property
args.OldProperty.Value); //previous value
this.OnAttributeChanged(dargs);
}
else
{
PropertyDataChangedEventArgs dargs =
new PropertyDataChangedEventArgs(args.OldProperty.Id,
null, //the property
args.OldProperty.Value); //previous value
this.OnPropertyDataChanged(dargs);
}
}
else if (args.OldProperty == null)
{
//a property was added, see if it is a drawing attribute property
object defaultValueIfDrawingAttribute
= DrawingAttributes.GetDefaultDrawingAttributeValue(args.NewProperty.Id);
if (defaultValueIfDrawingAttribute != null)
{
if (!defaultValueIfDrawingAttribute.Equals(args.NewProperty.Value))
{
//this is a da guid
PropertyDataChangedEventArgs dargs =
new PropertyDataChangedEventArgs(args.NewProperty.Id,
args.NewProperty.Value, //the property
defaultValueIfDrawingAttribute); //previous value
this.OnAttributeChanged(dargs);
}
}
else
{
PropertyDataChangedEventArgs dargs =
new PropertyDataChangedEventArgs(args.NewProperty.Id,
args.NewProperty.Value, //the property
null); //previous value
this.OnPropertyDataChanged(dargs);
}
}
else
{
//something was modified, see if it is a drawing attribute property
object defaultValueIfDrawingAttribute
= DrawingAttributes.GetDefaultDrawingAttributeValue(args.NewProperty.Id);
if (defaultValueIfDrawingAttribute != null)
{
//
// we only raise DA changed when the value actually changes
//
if (!args.NewProperty.Value.Equals(args.OldProperty.Value))
{
//this is a da guid
PropertyDataChangedEventArgs dargs =
new PropertyDataChangedEventArgs(args.NewProperty.Id,
args.NewProperty.Value, //the da
args.OldProperty.Value); //old value
this.OnAttributeChanged(dargs);
}
}
else
{
if (!args.NewProperty.Value.Equals(args.OldProperty.Value))
{
PropertyDataChangedEventArgs dargs =
new PropertyDataChangedEventArgs(args.NewProperty.Id,
args.NewProperty.Value,
args.OldProperty.Value); //old value
this.OnPropertyDataChanged(dargs);
}
}
}
}
