From 5f75c4f4f6736ff8efa87beab715fd9a044f666c Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Wed, 12 Sep 2018 23:09:13 +0800
Subject: ...

Never use PostMessage with hwnd as null!!!!!!!!!!!!!!!!!!!!!!!!
---
 CruUI/application.cpp | 66 ++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 44 insertions(+), 22 deletions(-)

(limited to 'CruUI/application.cpp')

diff --git a/CruUI/application.cpp b/CruUI/application.cpp
index 3ee7817d..c60bb043 100644
--- a/CruUI/application.cpp
+++ b/CruUI/application.cpp
@@ -1,10 +1,13 @@
 #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;
@@ -21,6 +24,20 @@ namespace cru {
 
         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>();
@@ -37,12 +54,8 @@ namespace cru {
 
         while (GetMessage(&msg, nullptr, 0, 0))
         {
-            if (!HandleThreadMessage(msg))
-            {
-                TranslateMessage(&msg);
-                DispatchMessage(&msg);
-
-            }
+            TranslateMessage(&msg);
+            DispatchMessage(&msg);
         }
 
         return static_cast<int>(msg.wParam);
@@ -52,45 +65,54 @@ namespace cru {
         ::PostQuitMessage(quit_code);
     }
 
-    bool Application::HandleThreadMessage(const MSG& message)
+    LRESULT Application::GodWndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
     {
-        if (message.hwnd != nullptr)
-            return false;
+        const auto app = Application::GetInstance();
 
-        switch (message.message)
+        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*>(message.wParam);
+            const auto p_action = reinterpret_cast<InvokeLaterAction*>(w_param);
             (*p_action)();
             delete p_action;
-            return true;
+            return 0;
         }
         case WM_TIMER:
         {
-            const auto action = timer_manager_->GetAction(static_cast<UINT_PTR>(message.wParam));
+            const auto action = GetTimerManager()->GetAction(static_cast<UINT_PTR>(w_param));
             if (action.has_value())
             {
                 action.value()();
-                return true;
+                return 0;
             }
             break;
         }
         default:
-            return false;
+            return std::nullopt;
         }
-        return false;
+        return std::nullopt;
     }
 
     void InvokeLater(InvokeLaterAction&& action) {
         //copy the action to a safe place
         auto p_action_copy = new InvokeLaterAction(std::move(action));
 
-        PostMessage(
-            nullptr,
-            invoke_later_message_id,
-            reinterpret_cast<WPARAM>(p_action_copy),
-            0
-        );
+        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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