private System.ComponentModel.Design.DesignerTransaction CreateTransaction(object obj, string description)
{
IComponent component = obj as IComponent;
if (component == null || component.Site == null)
{
return(null);
}
System.ComponentModel.Design.IDesignerHost designerHost = (System.ComponentModel.Design.IDesignerHost)component.Site.GetService(typeof(System.ComponentModel.Design.IDesignerHost));
if (designerHost == null)
{
return(null);
}
System.ComponentModel.Design.DesignerTransaction result = designerHost.CreateTransaction(description);
System.ComponentModel.Design.IComponentChangeService componentChangeService = (System.ComponentModel.Design.IComponentChangeService)component.Site.GetService(typeof(System.ComponentModel.Design.IComponentChangeService));
if (componentChangeService != null)
{
componentChangeService.OnComponentChanging(component, this);
}
return(result);
}
private void EndTransaction(object obj, System.ComponentModel.Design.DesignerTransaction tran, object oldValue, object newValue, bool commit)
{
if (tran == null)
{
this.OnValueChanged(obj, new PropertyChangedEventArgs(this.Name));
return;
}
if (commit)
{
IComponent component = obj as IComponent;
System.ComponentModel.Design.IComponentChangeService componentChangeService = (System.ComponentModel.Design.IComponentChangeService)component.Site.GetService(typeof(System.ComponentModel.Design.IComponentChangeService));
if (componentChangeService != null)
{
componentChangeService.OnComponentChanged(component, this, oldValue, newValue);
}
tran.Commit();
this.OnValueChanged(obj, new PropertyChangedEventArgs(this.Name));
}
else
{
tran.Cancel();
}
}