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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/** \file
* \ingroup spoutliner
*/
#pragma once
#include "tree_element.h"
namespace blender::ed::outliner {
/* -------------------------------------------------------------------- */
/* Tree-Display Interface */
class AbstractTreeElement {
protected:
/**
* Reference back to the owning legacy TreeElement.
* Most concrete types need access to this, so storing here. Eventually the type should be
* replaced by AbstractTreeElement and derived types.
*/
TreeElement &legacy_te_;
public:
virtual ~AbstractTreeElement() = default;
/**
* Check if the type is expandable in current context.
*/
virtual bool expandPoll(const SpaceOutliner &) const
{
return true;
}
/**
* Let the type add its own children.
*/
virtual void expand(SpaceOutliner &) const
{
}
virtual void postExpand(SpaceOutliner &) const
{
}
/**
* Just while transitioning to the new tree-element design: Some types are only partially ported,
* and the expanding isn't done yet.
*/
virtual bool isExpandValid() const
{
return true;
}
protected:
/* Pseudo-abstract: Only allow creation through derived types. */
AbstractTreeElement(TreeElement &legacy_te) : legacy_te_(legacy_te)
{
}
};
} // namespace blender::ed::outliner
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