public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
{
var editorService = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));
var listBox = new DoubleListBox();
Tag[] categories = FetchAllCategories();
listBox.AssignFlattenedSecondaryList(CatalogTagRegistry.AllTags().ToObjectArray());
Tag currentlySelectedTag = ExtractTag(value);
Tag currentCategory = GetCurrentCategory(currentlySelectedTag);
listBox.AssignPrimaryList(categories.ToObjectArray());
AssignSelectedIndex(categories.ToObjectArray(), currentCategory, index => listBox.PrimarySelectedIndex = index);
object[] availableTags = UpdateTagListBox(currentCategory, listBox);
AssignSelectedIndex(availableTags, currentlySelectedTag, index => listBox.SecondarySelectedIndex = index);
listBox.PrimaryItemSelected += (sender, args) =>
{
int selectedIndex = listBox.PrimarySelectedIndex;
Tag selectedCategory = categories[selectedIndex];
UpdateTagListBox(selectedCategory, listBox);
};
listBox.SecondaryItemSelected += (sender, args) => editorService.CloseDropDown();
editorService.DropDownControl(listBox);
return(listBox.SecondarySelectedItem ?? value);
}
private static IEnumerable <Tag> FetchTagsForCategory(Tag category)
{
return(CatalogTagRegistry.FetchTagsForCategory(category.Value).Order().ToArray());
}
private static Tag GetCurrentCategory(Tag currentlySelectedTag)
{
return(CatalogTagRegistry.GetCategoryFor(currentlySelectedTag));
}
private static Tag[] FetchAllCategories()
{
return
(CatalogTagRegistry.AllCategoriesWithDummiesForUnpairedTags().Order().ToArray());
}
