Jacques Lucke
9e437aabdb
We cannot use `std::variant` yet, because not all of the compilers we support have a working version of it yet. For now, I just replaced it with multiple `std::option` which is good enough, because currently `CellValue` is only used for the cells that are actually drawn in the spreadsheet.
116 lines
3.4 KiB
C++
116 lines
3.4 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#pragma once
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#include <optional>
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#include "spreadsheet_draw.hh"
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struct Object;
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struct Collection;
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namespace blender::ed::spreadsheet {
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struct ObjectCellValue {
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const Object *object;
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};
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struct CollectionCellValue {
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const Collection *collection;
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};
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/**
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* This is a small type that can hold the value of a cell in a spreadsheet. This type allows us to
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* decouple the drawing of individual cells from the code that generates the data to be displayed.
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*/
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class CellValue {
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public:
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/* The implementation just uses a bunch of `std::option` for now. Unfortunately, we cannot use
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* `std::variant` yet, due to missing compiler support. This type can really be optimized more,
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* but it does not really matter too much currently. */
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std::optional<int> value_int;
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std::optional<float> value_float;
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std::optional<bool> value_bool;
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std::optional<ObjectCellValue> value_object;
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std::optional<CollectionCellValue> value_collection;
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};
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/**
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* This represents a column in a spreadsheet. It has a name and provides a value for all the cells
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* in the column.
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*/
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class SpreadsheetColumn {
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protected:
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std::string name_;
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public:
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SpreadsheetColumn(std::string name) : name_(std::move(name))
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{
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}
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virtual ~SpreadsheetColumn() = default;
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virtual void get_value(int index, CellValue &r_cell_value) const = 0;
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StringRefNull name() const
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{
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return name_;
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}
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/* The default width of newly created columns, in UI units. */
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float default_width = 0.0f;
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};
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/* Utility class for the function below. */
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template<typename GetValueF> class LambdaSpreadsheetColumn : public SpreadsheetColumn {
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private:
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GetValueF get_value_;
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public:
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LambdaSpreadsheetColumn(std::string name, GetValueF get_value)
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: SpreadsheetColumn(std::move(name)), get_value_(std::move(get_value))
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{
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}
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void get_value(int index, CellValue &r_cell_value) const final
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{
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get_value_(index, r_cell_value);
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}
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};
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/* Utility function that simplifies creating a spreadsheet column from a lambda function. */
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template<typename GetValueF>
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std::unique_ptr<SpreadsheetColumn> spreadsheet_column_from_function(std::string name,
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GetValueF get_value)
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{
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return std::make_unique<LambdaSpreadsheetColumn<GetValueF>>(std::move(name),
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std::move(get_value));
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}
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/* This contains information required to create a spreadsheet drawer from columns. */
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struct SpreadsheetColumnLayout {
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Vector<const SpreadsheetColumn *> columns;
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Span<int64_t> row_indices;
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int tot_rows = 0;
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};
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std::unique_ptr<SpreadsheetDrawer> spreadsheet_drawer_from_column_layout(
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const SpreadsheetColumnLayout &column_layout);
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} // namespace blender::ed::spreadsheet
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