/// <summary>
/// Filter the queued events and merge duplicates.
/// </summary>
/// <param name="queueIn"></param>
/// <param name="forward"></param>
/// <returns></returns>
public static JsArray <Events.Abstract> filter(JsArray <Events.Abstract> queueIn, bool forward)
{
var queue = new JsArray <Events.Abstract>(queueIn.Clone());
if (!forward)
{
// Undo is merged in reverse order.
queue.Reverse();
}
// Merge duplicates. O(n^2), but n should be very small.
for (var i = 0; i < queue.Length; i++)
{
var event1 = queue[i];
for (var j = i + 1; j < queue.Length; j++)
{
var event2 = queue[j];
if (event1.type == event2.type &&
event1.blockId == event2.blockId &&
event1.workspaceId == event2.workspaceId)
{
if (event1.type == Events.MOVE)
{
// Merge move events.
((Events.Move)event1).newParentId = ((Events.Move)event2).newParentId;
((Events.Move)event1).newInputName = ((Events.Move)event2).newInputName;
((Events.Move)event1).newCoordinate = ((Events.Move)event2).newCoordinate;
queue.Splice(j, 1);
j--;
}
else if (event1.type == Events.CHANGE &&
((Events.Change)event1).element == ((Events.Change)event2).element &&
((Events.Change)event1).name == ((Events.Change)event2).name)
{
// Merge change events.
((Events.Change)event1).newValue = ((Events.Change)event2).newValue;
queue.Splice(j, 1);
j--;
}
else if (event1.type == Events.UI &&
((Events.Ui)event2).element == "click" &&
(((Events.Ui)event1).element == "commentOpen" ||
((Events.Ui)event1).element == "mutatorOpen" ||
((Events.Ui)event1).element == "warningOpen"))
{
// Merge change events.
((Events.Ui)event1).newValue = ((Events.Ui)event2).newValue;
queue.Splice(j, 1);
j--;
}
}
}
}
// Remove null events.
for (var i = queue.Length - 1; i >= 0; i--)
{
if (queue[i].isNull())
{
queue.Splice(i, 1);
}
}
if (!forward)
{
// Restore undo order.
queue.Reverse();
}
// Move mutation events to the top of the queue.
// Intentionally skip first event.
Events.Abstract ev;
for (var i = 1; i < queue.Length; i++)
{
ev = queue[i];
if (ev.type == Events.CHANGE &&
((Events.Change)ev).element == "mutation")
{
queue.Unshift(queue.Splice(i, 1)[0]);
}
}
return(queue);
}