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/*
This file is part of Warzone 2100.
Copyright (C) 2021 Warzone 2100 Project
Warzone 2100 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.
Warzone 2100 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 Warzone 2100; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "gridlayout.h"
#include "widgbase.h"
#include "lib/ivis_opengl/pieblitfunc.h"
#include <algorithm>
#include <nonstd/optional.hpp>
#include <map>
#include <set>
GridLayout::GridLayout(): WIDGET()
{
}
void GridLayout::place(grid_allocation::slot column, grid_allocation::slot row, std::shared_ptr<WIDGET> widget)
{
attach(widget);
placements.emplace_back(GridLayout::Placement {column, row, widget});
invalidateAllocation();
}
int32_t GridLayout::idealWidth()
{
return getColumnAllocator().get_minimum_size();
}
int32_t GridLayout::idealHeight()
{
return getRowAllocator().get_minimum_size();
}
nonstd::optional<std::vector<uint32_t>> GridLayout::getScrollSnapOffsets()
{
updateLayout();
return scrollSnapOffsets;
}
void GridLayout::displayRecursive(WidgetGraphicsContext const &context)
{
updateLayout();
auto overrideContext = context
.setAllowChildDisplayRecursiveIfSelfClipped(true);
WIDGET::displayRecursive(overrideContext);
}
void GridLayout::geometryChanged()
{
invalidateLayout();
}
void GridLayout::updateLayout()
{
if (!layoutDirty)
{
return;
}
layoutDirty = false;
columnOffsets = getColumnAllocator().calculate_offsets(width());
rowOffsets = getRowAllocator().calculate_offsets(height());
scrollSnapOffsets.resize(rowOffsets.size());
size_t i = 0;
for (auto offset: rowOffsets)
{
scrollSnapOffsets[i++] = offset.second;
}
for (auto &placement: placements)
{
auto left = columnOffsets[placement.column.start];
auto right = columnOffsets[placement.column.start + placement.column.span];
auto top = rowOffsets[placement.row.start];
auto bottom = rowOffsets[placement.row.start + placement.row.span];
placement.widget->setGeometry(left, top, right - left, bottom - top);
}
}
const std::map<uint32_t, int32_t> &GridLayout::getColumnOffsets()
{
updateLayout();
return columnOffsets;
}
const std::map<uint32_t, int32_t> &GridLayout::getRowOffsets()
{
updateLayout();
return rowOffsets;
}
void GridLayout::invalidateLayout()
{
layoutDirty = true;
}
void GridLayout::invalidateAllocation()
{
columnAllocation.reset();
rowAllocation.reset();
invalidateLayout();
}
std::vector<grid_allocation::item> GridLayout::getAllocationItems(PlacementTransformer placementTransformer)
{
auto items = std::vector<grid_allocation::item>();
for (const auto &placement: placements)
{
items.push_back(placementTransformer(placement));
}
return items;
}
grid_allocation::item GridLayout::placementColumn(GridLayout::Placement placement)
{
return {placement.column, placement.widget->idealWidth()};
}
grid_allocation::item GridLayout::placementRow(GridLayout::Placement placement)
{
return {placement.row, placement.widget->idealHeight()};
}
GridLayout::Placement::Placement(grid_allocation::slot column, grid_allocation::slot row, std::shared_ptr<WIDGET> widget)
: column(column)
, row(row)
, widget(widget)
{
}
grid_allocation::allocator &GridLayout::getColumnAllocator()
{
if (!columnAllocation)
{
columnAllocation.emplace(getAllocationItems(GridLayout::placementColumn));
}
return columnAllocation.value();
}
grid_allocation::allocator &GridLayout::getRowAllocator()
{
if (!rowAllocation)
{
rowAllocation.emplace(getAllocationItems(GridLayout::placementRow));
}
return rowAllocation.value();
}
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