private DbCategoryTreeViewItem CreateTreeItem(Category category, bool?isChecked = false, int count = 0)
{
DbCategoryTreeViewItem item = new DbCategoryTreeViewItem(category, isChecked, count);
item.Items.Add(new DbProcessingTreeViewItem());
return(item);
}
async void notifications_RefreshCategory(object sender, DbCategoryRefreshEventArgs e)
{
DbCategoryTreeViewItem categoryTreeViewItem = e.DbCategoryTreeViewItem;
Category category = categoryTreeViewItem.Tag as Category;
DbCategoryTreeViewItem parent = categoryTreeViewItem.Parent as DbCategoryTreeViewItem;
//At the Root Node
if (parent == null)
{
categoryTreeViewItem.Items.Clear();
categoryTreeViewItem.Items.Add(new DbProcessingTreeViewItem());
await AddSubCategoriesUnderRootCategory(categoryTreeViewItem);
}
else
{
int index = parent.Items.IndexOf(categoryTreeViewItem);
// Get refreshed Category From database
dbContext.CategoryItems.Include("Products").ToList();
var refreshedCategory = dbContext.CategoryItems.Where(cat => cat.Name == category.Name).FirstOrDefault();
// Delete Selected category node as we got refreshed Category From database
parent.Items.RemoveAt(index);
// Insert refreshedCategory to treeview and add products under refreshedCategories
if (refreshedCategory != null)
{
var refreshedCategoryTreeViewItem = CreateTreeItem(refreshedCategory, false, refreshedCategory.Products.Count);
parent.Items.Insert(index, refreshedCategoryTreeViewItem);
await AddProductsUnderCategory(refreshedCategoryTreeViewItem, refreshedCategory);
refreshedCategoryTreeViewItem.IsExpanded = true;
}
}
}
private async Task AddSubCategoriesUnderRootCategory(DbCategoryTreeViewItem item)
{
var getCategoriesFromDbTask = new Task <IList <Category> >(() =>
{
return(dbContext.CategoryItems.ToList());
});
getCategoriesFromDbTask.Start();
var categories = await getCategoriesFromDbTask;
item.Items.Clear();
foreach (var category in categories.Where(cat => cat.ParentId != -1))
{
DbCategoryTreeViewItem categoryTreeviewItem;
if (category.Products.Count == 0)
{
categoryTreeviewItem = new DbCategoryTreeViewItem(category, false, category.Products.Count);
}
else
{
categoryTreeviewItem = CreateTreeItem(category, false, category.Products.Count);
}
categoryTreeviewItem.Tag = category;
DbRootTreeViewNode.Items.Add(categoryTreeviewItem);
}
}
private void InitApplication()
{
dbContext = new ProductStoreDbContext();
DbRootTreeViewNode = CreateRootDbTreeViewNode();
dbTreeViewNotifications = Global.DbTreeViewNotifications;
dbTreeViewNotifications.DeleteDbCategory += new EventHandler <DbCategoryDeleteEventArgs>(notifications_DeleteCategory);
dbTreeViewNotifications.DeleteDbProduct += new EventHandler <DbProductDeleteEventArgs>(notifications_DeleteProduct);
dbTreeViewNotifications.RefreshDbCategory += new EventHandler <DbCategoryRefreshEventArgs>(notifications_RefreshCategory);
}
void notifications_DeleteProduct(object sender, DbProductDeleteEventArgs e)
{
DbProductTreeViewItem productTreeViewItem = e.DbProductTreeViewItem;
//To get the parent of the productTreeViewItem which is a CategoryTreeViewItem
DbCategoryTreeViewItem Parent = productTreeViewItem.Parent as DbCategoryTreeViewItem;
//Removing the TreeItem from Parent
Parent.Items.Remove(productTreeViewItem);
}
void refreshCategory_Click(object sender, RoutedEventArgs e)
{
var refreshCtxMenuItem = e.Source as RefreshCtxMenuItem;
//To get the Tree from which the context menu is called
DbCategoryTreeViewItem dbCategoryTreeViewItem = ((ContextMenu)refreshCtxMenuItem.Parent).PlacementTarget as DbCategoryTreeViewItem;
_dbTreeViewNotifications.OnDbRefreshCategory(new DbCategoryRefreshEventArgs()
{
DbCategoryTreeViewItem = dbCategoryTreeViewItem
});
}
private DbCategoryTreeViewItem CreateRootDbTreeViewNode()
{
Category rootCategory = new Category()
{
Name = "Database", ParentId = -1
};
DbRootTreeViewNode = CreateTreeItem(rootCategory);
dbTreeView.Items.Add(DbRootTreeViewNode);
return(DbRootTreeViewNode);
}
private async Task AddProductsUnderCategory(DbCategoryTreeViewItem item, Category category)
{
var synchronizationContext = TaskScheduler.FromCurrentSynchronizationContext();
var cancellationToken = new CancellationToken();
await Task.Factory.StartNew(() =>
{
item.Items.Clear();
foreach (var product in category.Products)
{
var treeViewItem = new DbProductTreeViewItem(product, false);
treeViewItem.Tag = product;
item.Items.Add(treeViewItem);
}
}, cancellationToken, TaskCreationOptions.None, synchronizationContext);
}
void notifications_DeleteCategory(object sender, DbCategoryDeleteEventArgs e)
{
DbCategoryTreeViewItem categoryTreeViewItem = e.DbCategoryTreeViewItem;
//If Root Node
if (categoryTreeViewItem.Parent is TreeView)
{
categoryTreeViewItem.Items.Clear();
}
//If not Root Node
if (categoryTreeViewItem.Parent is TreeViewItem)
{
TreeViewItem parent = (TreeViewItem)categoryTreeViewItem.Parent;
parent.Items.Remove(categoryTreeViewItem);
}
}
private async void dbTreeView_Expanded(object sender, RoutedEventArgs e)
{
DbCategoryTreeViewItem item = e.Source as DbCategoryTreeViewItem;
if ((item.Items.Count == 1) && (item.Items[0] is DbProcessingTreeViewItem))
{
var category = item.Tag as Category;
//If Root Node
if (category.ParentId == -1)
{
await AddSubCategoriesUnderRootCategory(item);
}
else
{
await AddProductsUnderCategory(item, category);
}
}
}