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#include "cru/platform/win/god_window.hpp"
#include "cru/platform/win/exception.hpp"
#include "cru/platform/win/win_application.hpp"
#include "cru/platform/win/window_class.hpp"
#include "god_window_message.hpp"
#include "timer.hpp"
namespace cru::platform::win {
constexpr auto god_window_class_name = L"GodWindowClass";
LRESULT CALLBACK GodWndProc(HWND hWnd, UINT uMsg, WPARAM wParam,
LPARAM lParam) {
const auto app = WinApplication::GetInstance();
if (app) {
LRESULT result;
const auto handled =
app->GetGodWindow()->HandleGodWindowMessage(hWnd, uMsg, wParam, lParam, &result);
if (handled)
return result;
else
return DefWindowProcW(hWnd, uMsg, wParam, lParam);
} else
return DefWindowProcW(hWnd, uMsg, wParam, lParam);
}
GodWindow::GodWindow(WinApplication* application) {
application_ = application;
const auto h_instance = application->GetInstanceHandle();
god_window_class_ = std::make_shared<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 Win32Error(::GetLastError(), "Failed to create god window.");
}
GodWindow::~GodWindow() { ::DestroyWindow(hwnd_); }
bool GodWindow::HandleGodWindowMessage(HWND hwnd, UINT msg, WPARAM w_param,
LPARAM l_param, LRESULT* result) {
switch (msg) {
case invoke_later_message_id: {
const auto p_action = reinterpret_cast<std::function<void()>*>(w_param);
(*p_action)();
delete p_action;
*result = 0;
return true;
}
case WM_TIMER: {
const auto id = static_cast<UINT_PTR>(w_param);
const auto action = application_->GetTimerManager()->GetAction(id);
if (action.has_value()) {
(action.value().second)();
if (!action.value().first)
application_->GetTimerManager()->KillTimer(id);
result = 0;
return true;
}
break;
}
default:
return false;
}
return false;
}
} // namespace cru::platform::win
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