private void AppendCustomCategories()
{
// Initialize our current index in the custom categories list
int currentIndex = 0;
// Keep track whether we add the Known Categories to our list
bool knownCategoriesAdded = false;
if (customCategoriesCollection != null)
{
// Append each category to list
foreach (JumpListCustomCategory category in customCategoriesCollection)
{
// If our current index is same as the KnownCategory OrdinalPosition,
// append the Known Categories
if (!knownCategoriesAdded && currentIndex == KnownCategoryOrdinalPosition)
{
AppendKnownCategories();
knownCategoriesAdded = true;
}
// Don't process empty categories
if (category.JumpListItems.Count == 0)
{
continue;
}
IObjectCollection categoryContent =
(IObjectCollection) new CEnumerableObjectCollection();
// Add each link's shell representation to the object array
foreach (IJumpListItem link in category.JumpListItems)
{
JumpListItem listItem = link as JumpListItem;
JumpListLink listLink = link as JumpListLink;
if (listItem != null)
{
categoryContent.AddObject(listItem.NativeShellItem);
}
else if (listLink != null)
{
categoryContent.AddObject(listLink.NativeShellLink);
}
}
// Add current category to destination list
HResult hr = customDestinationList.AppendCategory(
category.Name,
(IObjectArray)categoryContent);
if (!CoreErrorHelper.Succeeded(hr))
{
if ((uint)hr == 0x80040F03)
{
throw new InvalidOperationException(LocalizedMessages.JumpListFileTypeNotRegistered);
}
else if ((uint)hr == 0x80070005 /*E_ACCESSDENIED*/)
{
// If the recent documents tracking is turned off by the user,
// custom categories or items to an existing category cannot be added.
// The recent documents tracking can be changed via:
// 1. Group Policy “Do not keep history of recently opened documents”.
// 2. Via the user setting “Store and display recently opened items in
// the Start menu and the taskbar” in the Start menu property dialog.
//
throw new UnauthorizedAccessException(LocalizedMessages.JumpListCustomCategoriesDisabled);
}
throw new ShellException(hr);
}
// Increase our current index
currentIndex++;
}
}
// If the ordinal position was out of range, append the Known Categories
// at the end
if (!knownCategoriesAdded)
{
AppendKnownCategories();
}
}
//The following method is part of the lab. Ensure that the filename is valid,
//and if it is -- create a new item and add it to the current category, and refresh
//the jump list.
private void createCategoryItem_Click(object sender, RoutedEventArgs e)
{
//TODO: Task 6--Using Taskbar Jump Lists, steps 26-31
if (!CheckFileName(txtCategoryItem.Text))
return;
JumpListItem jli = new JumpListItem(GetTempFileName(txtCategoryItem.Text));
_currentCategory.AddJumpListItems(jli);
JumpList.Refresh();
}
