protected override void DoPatch(NListPatchEntry i)
{
var idx = i.iFinal;
var x = _target[idx];
var y = i.Patch.Apply(x);
if (!ReferenceEquals(x, y))
{
_target[idx] = y;
}
}
void Add(NListPatchEntry entry)
{
if (_tail != null)
{
_tail.Next = entry;
}
else
{
_head = entry;
}
_tail = entry;
}
protected override void DoPatch(NListPatchEntry i)
{
var idx = i.iFinal;
var x = _target[idx];
var y = (UIElement)i.Patch.Apply(x);
if (!ReferenceEquals(x, y))
{
#if WPF
_target.RemoveAt(idx);
_target.Insert(idx, y);
#else
_target[idx] = y;
#endif
}
}
protected override void DoMove(NListPatchEntry i)
{
var idx = i.iRemove;
var x = _target[idx];
_target.RemoveAt(idx);
var p = i.Patch;
if (p != null)
{
x = (UIElement)p.Apply(x);
}
_target.Insert(i.iInsert, x);
}
public void Run(NListPatchEntry head)
{
for (var i = head; i != null; i = i.Next)
{
switch (i.Op)
{
case NListPatchOp.Insert: DoInsert(i); break;
case NListPatchOp.Remove: DoRemove(i); break;
case NListPatchOp.Patch: DoPatch(i); break;
case NListPatchOp.Move: DoMove(i); break;
}
NPatch.Finalize(i.Finalizer);
}
}
void OptimizeRemove(NListPatchEntry e)
{
var delta = 0;
var oldE = e.Finalizer;
var last = e;
for (var i = e.Next; i != null; i = i.Next)
{
switch (i.Op)
{
case NListPatchOp.Insert:
{
var newE = i.Value;
if (NPatch.ElementEquals(newE, oldE))
{
e.Op = NListPatchOp.Move; // transform to move
e.Finalizer = null; // remove finalizer
e.iInsert = i.iInsert + delta; // correct insert index at the time of move
e.iFinal = i.iFinal; // preserve final index
e.Patch = NPropDiffer.Diff(oldE, ref newE); // make patch
e.Value = oldE; // preserve moved value
last.Next = i.Next; // delete insertion
return;
}
delta--;
}
break;
case NListPatchOp.Remove:
delta++;
break;
}
last = i;
}
}
internal NListPatch(NListPatchEntry head)
{
_head = head;
}
protected override void DoRemove(NListPatchEntry i)
{
_target.RemoveAt(i.iRemove);
}
protected override void DoInsert(NListPatchEntry i)
{
_target.Insert(i.iInsert, (UIElement)i.Value.Create());
}
protected abstract void DoMove(NListPatchEntry i);
protected abstract void DoPatch(NListPatchEntry i);
protected abstract void DoInsert(NListPatchEntry i);
