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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 <optional>
#include "spreadsheet_draw.hh"
struct Object;
struct Collection;
namespace blender::ed::spreadsheet {
struct ObjectCellValue {
const Object *object;
};
struct CollectionCellValue {
const Collection *collection;
};
/**
* This is a small type that can hold the value of a cell in a spreadsheet. This type allows us to
* decouple the drawing of individual cells from the code that generates the data to be displayed.
*/
class CellValue {
public:
/* The implementation just uses a bunch of `std::option` for now. Unfortunately, we cannot use
* `std::variant` yet, due to missing compiler support. This type can really be optimized more,
* but it does not really matter too much currently. */
std::optional<int> value_int;
std::optional<float> value_float;
std::optional<bool> value_bool;
std::optional<ObjectCellValue> value_object;
std::optional<CollectionCellValue> value_collection;
};
/**
* This represents a column in a spreadsheet. It has a name and provides a value for all the cells
* in the column.
*/
class SpreadsheetColumn {
protected:
std::string name_;
public:
SpreadsheetColumn(std::string name) : name_(std::move(name))
{
}
virtual ~SpreadsheetColumn() = default;
virtual void get_value(int index, CellValue &r_cell_value) const = 0;
StringRefNull name() const
{
return name_;
}
/* The default width of newly created columns, in UI units. */
float default_width = 0.0f;
};
/* Utility class for the function below. */
template<typename GetValueF> class LambdaSpreadsheetColumn : public SpreadsheetColumn {
private:
GetValueF get_value_;
public:
LambdaSpreadsheetColumn(std::string name, GetValueF get_value)
: SpreadsheetColumn(std::move(name)), get_value_(std::move(get_value))
{
}
void get_value(int index, CellValue &r_cell_value) const final
{
get_value_(index, r_cell_value);
}
};
/* Utility function that simplifies creating a spreadsheet column from a lambda function. */
template<typename GetValueF>
std::unique_ptr<SpreadsheetColumn> spreadsheet_column_from_function(std::string name,
GetValueF get_value)
{
return std::make_unique<LambdaSpreadsheetColumn<GetValueF>>(std::move(name),
std::move(get_value));
}
/* This contains information required to create a spreadsheet drawer from columns. */
struct SpreadsheetColumnLayout {
Vector<const SpreadsheetColumn *> columns;
Span<int64_t> row_indices;
int tot_rows = 0;
};
std::unique_ptr<SpreadsheetDrawer> spreadsheet_drawer_from_column_layout(
const SpreadsheetColumnLayout &column_layout);
} // namespace blender::ed::spreadsheet
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