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#include "application.h"
#include <fmt/format.h>
#include "timer.h"
#include "ui/window.h"
#include "graph/graph.h"
namespace cru {
constexpr auto god_window_class_name = L"GodWindowClass";
constexpr int invoke_later_message_id = WM_USER + 2000;
Application* Application::instance_ = nullptr;
Application * Application::GetInstance() {
return instance_;
}
Application::Application(HINSTANCE h_instance)
: h_instance_(h_instance) {
if (instance_)
throw std::runtime_error("A application instance already exists.");
instance_ = this;
god_window_class_ = std::make_unique<ui::WindowClass>(god_window_class_name, GodWndProc, h_instance);
const auto hwnd = CreateWindowEx(0,
god_window_class_name,
L"", 0,
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
nullptr, nullptr, h_instance, nullptr
);
if (hwnd == nullptr)
throw std::runtime_error("Failed to create window.");
god_hwnd_ = hwnd;
window_manager_ = std::make_unique<ui::WindowManager>();
graph_manager_ = std::make_unique<graph::GraphManager>();
timer_manager_ = std::make_unique<TimerManager>();
}
Application::~Application()
{
instance_ = nullptr;
}
int Application::Run()
{
MSG msg;
while (GetMessage(&msg, nullptr, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return static_cast<int>(msg.wParam);
}
void Application::Quit(const int quit_code) {
::PostQuitMessage(quit_code);
}
LRESULT Application::GodWndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
const auto app = Application::GetInstance();
if (app)
{
const auto result = app->HandleGodWindowMessage(hWnd, Msg, wParam, lParam);
if (result.has_value())
return result.value();
else
return DefWindowProc(hWnd, Msg, wParam, lParam);
}
else
return DefWindowProc(hWnd, Msg, wParam, lParam);
}
std::optional<LRESULT> Application::HandleGodWindowMessage(HWND hwnd, int msg, WPARAM w_param, LPARAM l_param)
{
switch (msg)
{
case invoke_later_message_id:
{
const auto p_action = reinterpret_cast<InvokeLaterAction*>(w_param);
(*p_action)();
delete p_action;
return 0;
}
case WM_TIMER:
{
const auto action = GetTimerManager()->GetAction(static_cast<UINT_PTR>(w_param));
if (action.has_value())
{
action.value()();
return 0;
}
break;
}
default:
return std::nullopt;
}
return std::nullopt;
}
void InvokeLater(InvokeLaterAction&& action) {
//copy the action to a safe place
auto p_action_copy = new InvokeLaterAction(std::move(action));
if (PostMessageW(Application::GetInstance()->GetGodWindowHandle(), invoke_later_message_id, reinterpret_cast<WPARAM>(p_action_copy), 0) == 0)
throw std::runtime_error(fmt::format("Last error: {}.", ::GetLastError()));
}
}
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