//
// Methods
//
protected virtual void OnCleanUpVirtualizedItem(CleanUpVirtualizedItemEventArgs e)
{
CleanUpVirtualizedItemEventHandler handler = CleanUpVirtualizedItemEvent;
if (handler != null)
{
handler(this, e);
}
}
//
// Helper Methods
//
void RemoveUnusedContainers(int first, int count)
{
IRecyclingItemContainerGenerator generator = ItemContainerGenerator as IRecyclingItemContainerGenerator;
ItemsControl owner = ItemsControl.GetItemsOwner(this);
VirtualizationMode mode = GetVirtualizationMode(this);
CleanUpVirtualizedItemEventArgs args;
int last = first + count - 1;
GeneratorPosition pos;
int item;
//Console.WriteLine ("VSP.RemoveUnusedContainers ({0}, {1});", first, count);
pos = new GeneratorPosition(Children.Count - 1, 0);
while (pos.Index >= 0)
{
item = generator.IndexFromGeneratorPosition(pos);
if (item < first || item > last)
{
//Console.WriteLine ("\tRemoving item[{0}] (child #{1})", item, pos.Index);
args = new CleanUpVirtualizedItemEventArgs(Children[pos.Index], owner.Items[item]);
OnCleanUpVirtualizedItem(args);
if (!args.Cancel)
{
RemoveInternalChildRange(pos.Index, 1);
if (mode == VirtualizationMode.Recycling)
{
generator.Recycle(pos, 1);
}
else
{
generator.Remove(pos, 1);
}
}
}
pos.Index--;
}
}
/// <summary>
/// Override method to suppress the cleanup of rows
/// with validation errors.
/// </summary>
/// <param name="e"></param>
protected override void OnCleanUpVirtualizedItem(CleanUpVirtualizedItemEventArgs e)
{
base.OnCleanUpVirtualizedItem(e);
if (e.UIElement != null &&
Validation.GetHasError(e.UIElement))
{
e.Cancel = true;
}
}
//
// Methods
//
protected virtual void OnCleanUpVirtualizedItem (CleanUpVirtualizedItemEventArgs e)
{
CleanUpVirtualizedItemEventHandler handler = CleanUpVirtualizedItemEvent;
if (handler != null)
handler (this, e);
}
//
// Helper Methods
//
void RemoveUnusedContainers (int first, int count)
{
IRecyclingItemContainerGenerator generator = ItemContainerGenerator as IRecyclingItemContainerGenerator;
ItemsControl owner = ItemsControl.GetItemsOwner (this);
VirtualizationMode mode = GetVirtualizationMode (this);
CleanUpVirtualizedItemEventArgs args;
int last = first + count - 1;
GeneratorPosition pos;
int item;
//Console.WriteLine ("VSP.RemoveUnusedContainers ({0}, {1});", first, count);
pos = new GeneratorPosition (Children.Count - 1, 0);
while (pos.Index >= 0) {
item = generator.IndexFromGeneratorPosition (pos);
if (item < first || item > last) {
//Console.WriteLine ("\tRemoving item[{0}] (child #{1})", item, pos.Index);
args = new CleanUpVirtualizedItemEventArgs (Children[pos.Index], owner.Items[item]);
OnCleanUpVirtualizedItem (args);
if (!args.Cancel) {
RemoveInternalChildRange (pos.Index, 1);
if (mode == VirtualizationMode.Recycling)
generator.Recycle (pos, 1);
else
generator.Remove (pos, 1);
}
}
pos.Index--;
}
}
protected virtual new void OnCleanUpVirtualizedItem(CleanUpVirtualizedItemEventArgs e)
{
Contract.Requires(e != null);
}
private void LV_CleanUpVirtualizedItem(object sender, CleanUpVirtualizedItemEventArgs e)
{
StaticData.PreviewTasks.CancelTask(((DataItem)e.Value).Md5);
}
protected override void OnCleanUpVirtualizedItem(CleanUpVirtualizedItemEventArgs e)
{
e.UIElement.ClearValue(OffsetProperty);
base.OnCleanUpVirtualizedItem(e);
}
/// <summary>
/// Called when an item is being re-virtualized.
/// </summary>
protected virtual void OnCleanUpVirtualizedItem(CleanUpVirtualizedItemEventArgs e)
{
ItemsControl itemsControl = ItemsControl.GetItemsOwner(this);
if (itemsControl != null)
{
itemsControl.RaiseEvent(e);
}
}
/// <summary>
/// Extends BeginInvoke so that when a state object is not needed, null does not need to be passed.
/// <example>
/// cleanupvirtualizeditemeventhandler.BeginInvoke(sender, e, callback);
/// </example>
/// </summary>
public static IAsyncResult BeginInvoke(this CleanUpVirtualizedItemEventHandler cleanupvirtualizeditemeventhandler, Object sender, CleanUpVirtualizedItemEventArgs e, AsyncCallback callback)
{
if(cleanupvirtualizeditemeventhandler == null) throw new ArgumentNullException("cleanupvirtualizeditemeventhandler");
return cleanupvirtualizeditemeventhandler.BeginInvoke(sender, e, callback, null);
}
private bool NotifyCleanupItem(UIElement child, ItemsControl itemsControl)
{
CleanUpVirtualizedItemEventArgs e = new CleanUpVirtualizedItemEventArgs(itemsControl.ItemContainerGenerator.ItemFromContainer(child), child);
e.Source = this;
OnCleanUpVirtualizedItem(e);
return !e.Cancel;
}
private void CleanUpVirtualizedItemHandler(object sender, CleanUpVirtualizedItemEventArgs args)
{
args.Cancel = DataGridHelper.CanBeRecycled(args.UIElement);
}
protected virtual new void OnCleanUpVirtualizedItem(CleanUpVirtualizedItemEventArgs e)
{
}
private static void CleanUpVirtualizedItem(object sender, CleanUpVirtualizedItemEventArgs e)
{
var me = (DynamicGridCellsPanel)sender;
}
private void CleanUpVirtualizedItemHandler(object sender, CleanUpVirtualizedItemEventArgs e)
{
if (updatedWindowLock == false)
{
int i = (e.UIElement as DataGridRow).GetIndex();
updatedWindow.Remove(i);
}
}
