private static InstanceSave HandleDroppedElementInElement(ElementSave draggedAsElementSave, ElementSave target, out bool handled)
{
InstanceSave newInstance = null;
handled = false;
if (target == null)
{
MessageBox.Show("No Screen or Component selected");
}
else if (target is StandardElementSave)
{
MessageBox.Show("Standard types can't contain objects");
}
else if (draggedAsElementSave is ScreenSave)
{
MessageBox.Show("Screens can't be dropped into other Screens or Components");
}
else
{
bool canAdd = true;
if (draggedAsElementSave is ComponentSave && target is ComponentSave)
{
ComponentSave targetAsComponentSave = target as ComponentSave;
if (!targetAsComponentSave.CanContainInstanceOfType(draggedAsElementSave.Name))
{
MessageBox.Show("Can't add instance of " + draggedAsElementSave.Name + " in " + targetAsComponentSave.Name);
canAdd = false;
}
}
if (target.IsSourceFileMissing)
{
MessageBox.Show("The source file for " + target.Name + " is missing, so it cannot be edited");
canAdd = false;
}
if (canAdd)
{
#if DEBUG
if (draggedAsElementSave == null)
{
throw new Exception("DraggedAsElementSave is null and it shouldn't be. For vic - try to put this exception earlier to see what's up.");
}
#endif
string name = GetUniqueNameForNewInstance(draggedAsElementSave, target);
// First we want to re-select the target so that it is highlighted in the tree view and not
// the object we dragged off. This is so that plugins can properly use the SelectedElement.
ElementTreeViewManager.Self.Select(target);
newInstance = ElementTreeViewManager.Self.AddInstance(name, draggedAsElementSave.Name, target);
handled = true;
}
}
return(newInstance);
}
private static string GetErrorMessage(ElementSave draggedAsElementSave, ElementSave target, string errorMessage)
{
if (target == null)
{
errorMessage = "No Screen or Component selected";
}
if (errorMessage == null && target is StandardElementSave)
{
// do nothing, it's annoying:
errorMessage = "Standard types can't contain objects";
}
if (errorMessage == null && draggedAsElementSave is ScreenSave)
{
errorMessage = "Screens can't be dropped into other Screens or Components";
}
if (errorMessage == null)
{
if (draggedAsElementSave is ComponentSave && target is ComponentSave)
{
ComponentSave targetAsComponentSave = target as ComponentSave;
if (!targetAsComponentSave.CanContainInstanceOfType(draggedAsElementSave.Name))
{
errorMessage = "Can't add instance of " + draggedAsElementSave.Name + " in " + targetAsComponentSave.Name;
}
}
}
if (errorMessage == null && target.IsSourceFileMissing)
{
errorMessage = "The source file for " + target.Name + " is missing, so it cannot be edited";
}
return(errorMessage);
}