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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.
*/
#pragma once
#include "BLI_function_ref.hh"
#include "spreadsheet_column.hh"
#include "spreadsheet_column_values.hh"
namespace blender::ed::spreadsheet {
/**
* This class is subclassed to implement different data sources for the spreadsheet. A data source
* provides the information that should be displayed. It is not concerned with how data is laid
* out in the spreadsheet editor exactly.
*/
class DataSource {
public:
virtual ~DataSource();
/**
* Calls the callback with all the column ids that should be displayed as long as the user does
* not manually add or remove columns. The column id can be stack allocated. Therefore, the
* callback should not keep a reference to it (and copy it instead).
*/
virtual void foreach_default_column_ids(FunctionRef<void(const SpreadsheetColumnID &)> fn) const
{
UNUSED_VARS(fn);
}
/**
* Returns the column values the given column id. If no data exists for this id, null is
* returned.
*/
virtual std::unique_ptr<ColumnValues> get_column_values(
const SpreadsheetColumnID &column_id) const
{
UNUSED_VARS(column_id);
return {};
}
/**
* Returns the number of rows in columns returned by #get_column_values.
*/
virtual int tot_rows() const
{
return 0;
}
};
} // namespace blender::ed::spreadsheet
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