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//
// lager - library for functional interactive c++ programs
// Copyright (C) 2017 Juan Pedro Bolivar Puente
//
// This file is part of lager.
//
// lager is free software: you can redistribute it and/or modify
// it under the terms of the MIT License, as detailed in the LICENSE
// file located at the root of this source code distribution,
// or here: <https://github.com/arximboldi/lager/blob/master/LICENSE>
//
#include <SDL.h>
#include <SDL_ttf.h>
#include "../counter.hpp"
#include <lager/event_loop/sdl.hpp>
#include <lager/resources_path.hpp>
#include <lager/store.hpp>
#include <iostream>
#include <string>
std::string font_path()
{
using namespace std::string_literals;
return lager::resources_path() + "/SourceSansPro-Regular.ttf"s;
}
struct sdl_view
{
int width = 640;
int height = 480;
SDL_Window* window = SDL_CreateWindow("Lager Counter Example",
SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
width,
height,
SDL_WINDOW_SHOWN);
SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, 0);
TTF_Font* font = TTF_OpenFont(font_path().c_str(), 24);
};
void draw(sdl_view& v, counter::model c)
{
SDL_RenderClear(v.renderer);
// render background
{
SDL_SetRenderDrawColor(v.renderer, 255, 96, 128, 255);
auto rect = SDL_Rect{0, 0, v.width, v.height};
SDL_RenderFillRect(v.renderer, &rect);
}
// render text
{
auto msg = "counter value is " + std::to_string(c.value);
auto surf =
TTF_RenderText_Blended(v.font, msg.c_str(), {255, 255, 255, 255});
auto text = SDL_CreateTextureFromSurface(v.renderer, surf);
SDL_FreeSurface(surf);
auto rect = SDL_Rect{};
SDL_QueryTexture(text, nullptr, nullptr, &rect.w, &rect.h);
rect.x = v.width / 2 - rect.w / 2;
rect.y = v.height / 2 - rect.h / 2;
SDL_RenderCopy(v.renderer, text, nullptr, &rect);
}
SDL_RenderPresent(v.renderer);
}
std::optional<counter::action> intent(const SDL_Event& event)
{
if (event.type == SDL_KEYDOWN) {
switch (event.key.keysym.sym) {
case SDLK_UP:
return counter::increment_action{};
case SDLK_DOWN:
return counter::decrement_action{};
case SDLK_SPACE:
return counter::reset_action{};
default:
break;
}
}
return std::nullopt;
}
int main()
{
using namespace std::placeholders;
SDL_Init(SDL_INIT_VIDEO);
TTF_Init();
auto view = sdl_view{};
auto loop = lager::sdl_event_loop{};
auto store = lager::make_store<counter::action>(
counter::model{}, lager::with_sdl_event_loop{loop});
watch(store, [&](auto&& val) { draw(view, val); });
draw(view, store.get());
loop.run([&](const SDL_Event& ev) {
if (auto act = intent(ev))
store.dispatch(*act);
return ev.type != SDL_QUIT;
});
}
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