canvas.hpp

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// canvas.hpp
/*
  neogfx C++ App/Game Engine
  Copyright (c) 2015, 2020 Leigh Johnston.  All Rights Reserved.
  
  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 3 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, see <http://www.gnu.org/licenses/>.
*/
#pragma once
 
#include <neogfx/neogfx.hpp>
#include <neogfx/gui/widget/widget.hpp>
#include <neogfx/game/ecs.hpp>
 
namespace neogfx::game
{
    class canvas : public widget<>
    {
    public:
        define_event(RenderingEntities, rendering_entities, i_graphics_context&, int32_t)
        define_event(EntitiesRendered, entities_rendered, i_graphics_context&, int32_t)
        define_event(EntityClicked, entity_clicked, entity_id)
        define_event(EntityDoubleClicked, entity_double_clicked, entity_id)
    public:
        struct no_ecs : std::logic_error { no_ecs() : std::logic_error{ "neogfx::game::canvas::no_ecs" } {} };
        struct invalid_layer : std::logic_error { invalid_layer() : std::logic_error{ "neogfx::game::canvas::invalid_layer" } {} };
    public:
        canvas();
        canvas(game::i_ecs& aEcs);
        canvas(std::shared_ptr<game::i_ecs> aEcs);
        canvas(i_widget& aParent);
        canvas(i_widget& aParent, game::i_ecs& aEcs);
        canvas(i_widget& aParent, std::shared_ptr<game::i_ecs> aEcs);
        canvas(i_layout& aLayout);
        canvas(i_layout& aLayout, game::i_ecs& aEcs);
        canvas(i_layout& aLayout, std::shared_ptr<game::i_ecs> aEcs);
        ~canvas();
    public:
        bool have_ecs() const;
        game::i_ecs& ecs() const;
        void set_ecs(game::i_ecs& aEcs);
        void set_ecs(const std::shared_ptr<game::i_ecs>& aEcs);
        int32_t layers();
        void set_layers(int32_t aLayers);
        bool layer_visible(int32_t aLayer) const;
        void show_layer(int32_t aLayer);
        void hide_layer(int32_t aLayer);
    public:
        neogfx::logical_coordinate_system logical_coordinate_system() const override;
    public:
        void mouse_button_pressed(mouse_button aButton, const point& aPosition, key_modifiers_e aKeyModifiers) override;
        void mouse_button_double_clicked(mouse_button aButton, const point& aPosition, key_modifiers_e aKeyModifiers) override;
    private:
        void init();
    private:
        std::shared_ptr<game::i_ecs> iEcs;
        std::vector<bool> iLayers;
        sink iSink;
        std::optional<widget_timer> iUpdater;
        bool iEcsPaused;
    };
}
 
namespace neogfx
{
    using game::canvas;
}