WindowManager.h

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/*
    MetaImGUI
    Copyright (C) 2026  A P Nicholson
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/
 
#pragma once
 
#include <functional>
#include <string>
 
// Forward declarations
struct GLFWwindow;
 
namespace MetaImGUI {
 
class WindowManager {
public:
    WindowManager(std::string title, int width, int height);
    ~WindowManager();
 
    // Disable copy and move
    WindowManager(const WindowManager&) = delete;
    WindowManager& operator=(const WindowManager&) = delete;
    WindowManager(WindowManager&&) = delete;
    WindowManager& operator=(WindowManager&&) = delete;
 
    bool Initialize();
 
    void Shutdown();
 
    [[nodiscard]] bool ShouldClose() const;
 
    void PollEvents();
 
    void BeginFrame();
 
    void EndFrame();
 
    void GetFramebufferSize(int& width, int& height) const;
 
    void GetWindowSize(int& width, int& height) const;
 
    [[nodiscard]] GLFWwindow* GetNativeWindow() const {
        return m_window;
    }
 
    void RequestClose();
 
    void SetFramebufferSizeCallback(std::function<void(int, int)> callback);
 
    void SetKeyCallback(std::function<void(int, int, int, int)> callback);
 
    void SetWindowCloseCallback(std::function<void()> callback);
 
    void CancelClose();
 
    void SetContextLossCallback(std::function<bool()> callback);
 
    bool ValidateContext();
 
private:
    bool RecreateContext();
    // GLFW callbacks (static because GLFW is C API)
    static void ErrorCallback(int error, const char* description);
    static void FramebufferSizeCallbackInternal(GLFWwindow* window, int width, int height);
    static void KeyCallbackInternal(GLFWwindow* window, int key, int scancode, int action, int mods);
    static void WindowCloseCallbackInternal(GLFWwindow* window);
 
    GLFWwindow* m_window = nullptr;
    std::string m_title;
    int m_width;
    int m_height;
    bool m_initialized = false;
 
    // Context recovery
    int m_contextRecoveryAttempts = 0;
    static constexpr int MAX_RECOVERY_ATTEMPTS = 3;
 
    // Callbacks
    std::function<void(int, int)> m_framebufferSizeCallback;
    std::function<void(int, int, int, int)> m_keyCallback;
    std::function<void()> m_windowCloseCallback;
    std::function<bool()> m_contextLossCallback;
};
 
} // namespace MetaImGUI