/// <summary>
/// Synchronizes changes of srcList, applying them to destList.
/// Changes are described in args.
/// </summary>
public static void ApplyChanges(IList destList, IList srcList, ListChangedEventArgs args)
{
switch (args.Type)
{
case ListChangedEventType.ItemsInserted: {
for (int i = 0; i < args.Count; i++)
{
destList.Insert(args.Index + i, srcList[args.Index + i]);
}
break;
}
case ListChangedEventType.ItemsRemoved:
for (int i = 0; i < args.Count; i++)
{
destList.RemoveAt(args.Index);
}
break;
case ListChangedEventType.ItemReplaced: {
destList[args.Index] = srcList[args.Index];
break;
}
}
}
private void ItemsOnListChanged(object sender, ListChangedEventArgs args)
{
switch (args.Type)
{
case ListChangedEventType.ItemsInserted: {
for (int i = 0; i < args.Count; i++)
{
onItemInserted(i + args.Index);
}
break;
}
case ListChangedEventType.ItemsRemoved: {
foreach (TreeItem treeItem in args.RemovedItems.Cast <TreeItem>())
{
onItemRemoved(treeItem);
}
break;
}
case ListChangedEventType.ItemReplaced: {
onItemRemoved((TreeItem)args.RemovedItems[0]);
onItemInserted(args.Index);
break;
}
}
}
private void onListChanged(object sender, ListChangedEventArgs args) {
switch (args.Type) {
case ListChangedEventType.ItemsInserted: {
for (int i = 0; i < args.Count; i++) {
var control = (Control) list[args.Index + i];
parent.InsertChildAt(args.Index + i, control);
if (ControlAdded != null) ControlAdded.Invoke(control);
}
break;
}
case ListChangedEventType.ItemsRemoved:
for (int i = 0; i < args.Count; i++) {
Control control = parent.Children[args.Index];
parent.RemoveChild(control);
if (ControlRemoved != null) ControlRemoved.Invoke(control);
}
break;
case ListChangedEventType.ItemReplaced: {
var removedControl = parent.Children[args.Index];
parent.RemoveChild(removedControl);
if (ControlRemoved != null) ControlRemoved.Invoke(removedControl);
var addedControl = (Control) list[args.Index];
parent.InsertChildAt(args.Index, addedControl);
if (ControlAdded != null) ControlAdded.Invoke(addedControl);
break;
}
}
}
private void targetListChanged(object sender, ListChangedEventArgs args)
{
// To avoid side effects from old listeners
// (can be reproduced if call raisePropertyChanged inside another ObservableList handler)
// propertyChanged will cause re-subscription to ListChanged, but
// old list still can call ListChanged when enumerates event handlers
if (!ReferenceEquals(sender, targetList))
{
return;
}
ignoreSourceListener = true;
try {
ApplyChanges(sourceList, targetList, args);
} finally {
ignoreSourceListener = false;
}
}
private void ItemsOnListChanged(object sender, ListChangedEventArgs args) {
switch (args.Type) {
case ListChangedEventType.ItemsInserted: {
for (int i = 0; i < args.Count; i++)
onItemInserted(i + args.Index);
break;
}
case ListChangedEventType.ItemsRemoved: {
foreach (TreeItem treeItem in args.RemovedItems.Cast<TreeItem>())
onItemRemoved(treeItem);
break;
}
case ListChangedEventType.ItemReplaced: {
onItemRemoved((TreeItem) args.RemovedItems[0]);
onItemInserted(args.Index);
break;
}
}
}
private void targetListChanged(object sender, ListChangedEventArgs args) {
// To avoid side effects from old listeners
// (can be reproduced if call raisePropertyChanged inside another ObservableList handler)
// propertyChanged will cause re-subscription to ListChanged, but
// old list still can call ListChanged when enumerates event handlers
if (!ReferenceEquals(sender, targetList)) return;
ignoreSourceListener = true;
try {
ApplyChanges(sourceList, targetList, args);
} finally {
ignoreSourceListener = false;
}
}
/// <summary>
/// Synchronizes changes of srcList, applying them to destList.
/// Changes are described in args.
/// </summary>
public static void ApplyChanges(IList destList, IList srcList, ListChangedEventArgs args) {
switch (args.Type) {
case ListChangedEventType.ItemsInserted: {
for (int i = 0; i < args.Count; i++) {
destList.Insert(args.Index + i, srcList[args.Index + i]);
}
break;
}
case ListChangedEventType.ItemsRemoved:
for (int i = 0; i < args.Count; i++)
destList.RemoveAt(args.Index);
break;
case ListChangedEventType.ItemReplaced: {
destList[args.Index] = srcList[args.Index];
break;
}
}
}
