#ifndef RUNNER_WIN32_WINDOW_H_ #define RUNNER_WIN32_WINDOW_H_ #include <windows.h> #include <functional> #include <memory> #include <string> // A class abstraction for a high DPI-aware Win32 Window. Intended to be // inherited from by classes that wish to specialize with custom // rendering and input handling class Win32Window { public: struct Point { unsigned int x; unsigned int y; Point(unsigned int x, unsigned int y) : x(x), y(y) {} }; struct Size { unsigned int width; unsigned int height; Size(unsigned int width, unsigned int height) : width(width), height(height) {} }; Win32Window(); virtual ~Win32Window(); // Creates and shows a win32 window with |title| and position and size using // |origin| and |size|. New windows are created on the default monitor. Window // sizes are specified to the OS in physical pixels, hence to ensure a // consistent size to will treat the width height passed in to this function // as logical pixels and scale to appropriate for the default monitor. Returns // true if the window was created successfully. bool CreateAndShow(const std::wstring& title, const Point& origin, const Size& size); // Release OS resources associated with window. void Destroy(); // Inserts |content| into the window tree. void SetChildContent(HWND content); // Returns the backing Window handle to enable clients to set icon and other // window properties. Returns nullptr if the window has been destroyed. HWND GetHandle(); // If true, closing this window will quit the application. void SetQuitOnClose(bool quit_on_close); // Return a RECT representing the bounds of the current client area. RECT GetClientArea(); protected: // Processes and route salient window messages for mouse handling, // size change and DPI. Delegates handling of these to member overloads that // inheriting classes can handle. virtual LRESULT MessageHandler(HWND window, UINT const message, WPARAM const wparam, LPARAM const lparam) noexcept; // Called when CreateAndShow is called, allowing subclass window-related // setup. Subclasses should return false if setup fails. virtual bool OnCreate(); // Called when Destroy is called. virtual void OnDestroy(); private: friend class WindowClassRegistrar; // OS callback called by message pump. Handles the WM_NCCREATE message which // is passed when the non-client area is being created and enables automatic // non-client DPI scaling so that the non-client area automatically // responsponds to changes in DPI. All other messages are handled by // MessageHandler. static LRESULT CALLBACK WndProc(HWND const window, UINT const message, WPARAM const wparam, LPARAM const lparam) noexcept; // Retrieves a class instance pointer for |window| static Win32Window* GetThisFromHandle(HWND const window) noexcept; bool quit_on_close_ = false; // window handle for top level window. HWND window_handle_ = nullptr; // window handle for hosted content. HWND child_content_ = nullptr; }; #endif // RUNNER_WIN32_WINDOW_H_