private void tags_ItemRemoved(RaisingEventsList<FileTag> sender, RaisingEventsList<FileTag>.RaisingEventsListEventArgs e)
{
// Raise event
if (this.TagRemoved != null)
{
FileWithTagsEventArgs e2 = new FileWithTagsEventArgs(e.Item);
this.TagRemoved(this, e2);
}
// Unregister the tag's ValueChanging event
e.Item.ValueChanging -= this.tag_ValueChanging;
}
private void tags_ItemAdded(RaisingEventsList<FileTag> sender, RaisingEventsList<FileTag>.RaisingEventsListEventArgs e)
{
// Raise event
if (this.TagAdded != null)
{
FileWithTagsEventArgs e2 = new FileWithTagsEventArgs(e.Item);
this.TagAdded(this, e2);
}
// Subscribe to the ValueChanging event of the new tag
e.Item.ValueChanging += new ValueChangingHandler(this.tag_ValueChanging);
}
private void tag_ValueChanging(FileTag sender, FileTagEventArgs e)
{
FileTag newTag = new FileTag(e.NewValue);
// Don't allow the tag to be change into a value that already exists
if (this.tags.Exists(newTag.Compare))
{
e.Cancel = true;
throw new InvalidOperationException(string.Format(
"Can't change tag value from '{1}' to '{0}' because the tag '{0}' already exists in the file's tags list",
e.NewValue, e.OldValue));
}
// Raise event (removeTag and addTag)
if (this.TagRemoved != null)
{
FileWithTagsEventArgs e2 = new FileWithTagsEventArgs(sender);
this.TagRemoved(this, e2);
}
if (this.TagAdded != null)
{
FileWithTagsEventArgs e2 = new FileWithTagsEventArgs(newTag);
this.TagAdded(this, e2);
}
}
