Hello,
I begin to implement undo/redo for my custom object field, and for now the behavior works great but i want to make sure i do not do anything which is not needed (useless or incorrect with GoDiagram).
The following code works like expectation for me, but when i compare it to your GoDiagram sample (like ItemWidth field in Demo1) i remark you do not need to call "StartTransaction" and "FinishTransaction" in your sample. If i do not make these call my "Undo" stay disable and do not contains anything. My question: am i correct? or what you do differently (which i do not see) to avoid these calls.
My code:
public Int32 MaximumDisplacement
{
get { return maximumDisplacement; }
set {
Int32 old = maximumDisplacement;
if (old != value && this.Document != null)
{
this.Document.StartTransaction(); //correct?
maximumDisplacement = value;
Changed(ChangedMaximumDisplacement, old, null,
{
get { return maximumDisplacement; }
set {
Int32 old = maximumDisplacement;
if (old != value && this.Document != null)
{
this.Document.StartTransaction(); //correct?
maximumDisplacement = value;
Changed(ChangedMaximumDisplacement, old, null,
NullRect, value, null, NullRect);
this.Document.FinishTransaction("MaximumDisplacement"); //correct?
}
}
}
this.Document.FinishTransaction("MaximumDisplacement"); //correct?
}
}
}
private Int32 maximumDisplacement;
public override void ChangeValue(GoChangedEventArgs e, bool
undo) {
switch (e.SubHint) {
case ChangedMaximumDisplacement:
this.MaximumDisplacement = e.GetInt(undo);
return;
switch (e.SubHint) {
case ChangedMaximumDisplacement:
this.MaximumDisplacement = e.GetInt(undo);
return;
....
default:
base.ChangeValue(e, undo);
return;
}
}
default:
base.ChangeValue(e, undo);
return;
}
}