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#include "application.hpp"
#include "exception.hpp"
#include "timer.hpp"
#include "ui/cursor.hpp"
#include "ui/window_class.hpp"
namespace cru {
constexpr auto god_window_class_name = L"GodWindowClass";
constexpr int invoke_later_message_id = WM_USER + 2000;
LRESULT CALLBACK GodWndProc(HWND hWnd, UINT uMsg, WPARAM wParam,
LPARAM lParam) {
const auto app = Application::GetInstance();
if (app) {
const auto result =
app->GetGodWindow()->HandleGodWindowMessage(hWnd, uMsg, wParam, lParam);
if (result.has_value())
return result.value();
else
return DefWindowProc(hWnd, uMsg, wParam, lParam);
} else
return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
GodWindow::GodWindow(Application* application) {
const auto h_instance = application->GetInstanceHandle();
god_window_class_ = std::make_unique<ui::WindowClass>(god_window_class_name,
GodWndProc, h_instance);
hwnd_ = CreateWindowEx(0, god_window_class_name, L"", 0, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
HWND_MESSAGE, nullptr, h_instance, nullptr);
if (hwnd_ == nullptr) throw std::runtime_error("Failed to create window.");
}
GodWindow::~GodWindow() { ::DestroyWindow(hwnd_); }
std::optional<LRESULT> GodWindow::HandleGodWindowMessage(HWND hwnd, int msg,
WPARAM w_param,
LPARAM l_param) {
switch (msg) {
case invoke_later_message_id: {
const auto p_action = reinterpret_cast<std::function<void()>*>(w_param);
(*p_action)();
delete p_action;
return 0;
}
case WM_TIMER: {
const auto id = static_cast<UINT_PTR>(w_param);
const auto action = TimerManager::GetInstance()->GetAction(id);
if (action.has_value()) {
(action.value().second)();
if (!action.value().first) TimerManager::GetInstance()->KillTimer(id);
return 0;
}
break;
}
default:
return std::nullopt;
}
return std::nullopt;
}
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;
if (!::IsWindows8OrGreater())
throw std::runtime_error("Must run on Windows 8 or later.");
god_window_ = std::make_unique<GodWindow>(this);
ui::cursors::LoadSystemCursors();
}
Application::~Application() {
for (auto i = singleton_list_.crbegin(); i != singleton_list_.crend(); ++i)
delete *i;
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); }
void InvokeLater(const std::function<void()>& action) {
// copy the action to a safe place
auto p_action_copy = new std::function<void()>(action);
if (PostMessageW(Application::GetInstance()->GetGodWindow()->GetHandle(),
invoke_later_message_id,
reinterpret_cast<WPARAM>(p_action_copy), 0) == 0)
throw Win32Error(::GetLastError(), "InvokeLater failed to post message.");
}
} // namespace cru
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