Win32: Add GLFW_WIN32_KEYBOARD_MENU

This platform specific window hint enables access to the Windows window
menu via the keyboard shortcuts.

README.md

@@ -123,6 +123,8 @@ information on what to include when reporting a bug.
    relocatable (#1470)
  - Bugfix: Video modes with a duplicate screen area were discarded (#1555,#1556)
  - Bugfix: Compiling with -Wextra-semi caused warnings (#1440)
+ - [Win32] Added the `GLFW_WIN32_KEYBOARD_MENU` window hint for enabling access
+           to the window menu
  - [Win32] Bugfix: `GLFW_INCLUDE_VULKAN` plus `VK_USE_PLATFORM_WIN32_KHR` caused
    symbol redefinition (#1524)
  - [Win32] Bugfix: The cursor position event was emitted before its cursor enter

docs/news.dox

@@ -9,6 +9,15 @@
 
 @subsection features_34 New features in version 3.4
 
+@subsubsection features_34_win32_keymenu Support for keyboard access to Windows window menu
+
+GLFW now provides the
+[GLFW_WIN32_KEYBOARD_MENU](@ref GLFW_WIN32_KEYBOARD_MENU_hint) window hint for
+enabling keyboard access to the window menu via the Alt+Space and
+Alt-and-then-Space shortcuts.  This may be useful for more GUI-oriented
+applications.
+
+
 @subsection caveats_34 Caveats for version 3.4
 
 @subsubsection standalone_34 Tests and examples are disabled when built as a sub-project
@@ -35,6 +44,8 @@ add_subdirectory(path/to/glfw)
 @subsubsection types_34 New types in version 3.4
 @subsubsection constants_34 New constants in version 3.4
 
+ - @ref GLFW_WIN32_KEYBOARD_MENU
+
 
 @section news_archive Release notes for earlier versions
 

docs/window.dox

@@ -455,6 +455,14 @@ The no error mode for OpenGL and OpenGL ES is described in detail by the
 extension.
 
 
+@subsubsection window_hints_win32 Windows specific window hints
+
+@anchor GLFW_WIN32_KEYBOARD_MENU_hint
+__GLFW_WIN32_KEYBOARD_MENU__ specifies whether to allow access to the window
+menu via the Alt+Space and Alt-and-then-Space keyboard shortcuts.  This is
+ignored on other platforms.
+
+
 @subsubsection window_hints_osx macOS specific window hints
 
 @anchor GLFW_COCOA_RETINA_FRAMEBUFFER_hint
@@ -535,6 +543,7 @@ GLFW_CONTEXT_RELEASE_BEHAVIOR | `GLFW_ANY_RELEASE_BEHAVIOR` | `GLFW_ANY_RELEASE_
 GLFW_OPENGL_FORWARD_COMPAT    | `GLFW_FALSE`                | `GLFW_TRUE` or `GLFW_FALSE`
 GLFW_OPENGL_DEBUG_CONTEXT     | `GLFW_FALSE`                | `GLFW_TRUE` or `GLFW_FALSE`
 GLFW_OPENGL_PROFILE           | `GLFW_OPENGL_ANY_PROFILE`   | `GLFW_OPENGL_ANY_PROFILE`, `GLFW_OPENGL_COMPAT_PROFILE` or `GLFW_OPENGL_CORE_PROFILE`
+GLFW_WIN32_KEYBOARD_MENU      | `GLFW_FALSE`                | `GLFW_TRUE` or `GLFW_FALSE`
 GLFW_COCOA_RETINA_FRAMEBUFFER | `GLFW_TRUE`                 | `GLFW_TRUE` or `GLFW_FALSE`
 GLFW_COCOA_FRAME_NAME         | `""`                        | A UTF-8 encoded frame autosave name
 GLFW_COCOA_GRAPHICS_SWITCHING | `GLFW_FALSE`                | `GLFW_TRUE` or `GLFW_FALSE`

include/GLFW/glfw3.h

@@ -1003,6 +1003,7 @@ extern "C" {
  *  [window hint](@ref GLFW_X11_CLASS_NAME_hint).
  */
 #define GLFW_X11_INSTANCE_NAME      0x00024002
+#define GLFW_WIN32_KEYBOARD_MENU    0x00025001
 /*! @} */
 
 #define GLFW_NO_API                          0

src/internal.h

@@ -274,6 +274,9 @@ struct _GLFWwndconfig
         char      className[256];
         char      instanceName[256];
     } x11;
+    struct {
+        GLFWbool  keymenu;
+    } win32;
 };
 
 // Context configuration

src/win32_platform.h

@@ -315,6 +315,7 @@ typedef struct _GLFWwindowWin32
     // Whether to enable framebuffer transparency on DWM
     GLFWbool            transparent;
     GLFWbool            scaleToMonitor;
+    GLFWbool            keymenu;
 
     // The last received cursor position, regardless of source
     int                 lastCursorPosX, lastCursorPosY;

src/win32_window.c

@@ -699,7 +699,12 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
 
                 // User trying to access application menu using ALT?
                 case SC_KEYMENU:
-                    return 0;
+                {
+                    if (!window->win32.keymenu)
+                        return 0;
+
+                    break;
+                }
             }
             break;
         }
@@ -731,6 +736,10 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
             }
 
             _glfwInputChar(window, (unsigned int) wParam, getKeyMods(), plain);
+
+            if (uMsg == WM_SYSCHAR && window->win32.keymenu)
+                break;
+
             return 0;
         }
 
@@ -1275,6 +1284,7 @@ static int createNativeWindow(_GLFWwindow* window,
     }
 
     window->win32.scaleToMonitor = wndconfig->scaleToMonitor;
+    window->win32.keymenu = wndconfig->win32.keymenu;
 
     // Adjust window rect to account for DPI scaling of the window frame and
     // (if enabled) DPI scaling of the content area

src/window.c

@@ -363,6 +363,9 @@ GLFWAPI void glfwWindowHint(int hint, int value)
         case GLFW_COCOA_RETINA_FRAMEBUFFER:
             _glfw.hints.window.ns.retina = value ? GLFW_TRUE : GLFW_FALSE;
             return;
+        case GLFW_WIN32_KEYBOARD_MENU:
+            _glfw.hints.window.win32.keymenu = value ? GLFW_TRUE : GLFW_FALSE;
+            return;
         case GLFW_COCOA_GRAPHICS_SWITCHING:
             _glfw.hints.context.nsgl.offline = value ? GLFW_TRUE : GLFW_FALSE;
             return;

tests/gamma.c

@@ -101,6 +101,7 @@ int main(int argc, char** argv)
     monitor = glfwGetPrimaryMonitor();
 
     glfwWindowHint(GLFW_SCALE_TO_MONITOR, GLFW_TRUE);
+    glfwWindowHint(GLFW_WIN32_KEYBOARD_MENU, GLFW_TRUE);
 
     window = glfwCreateWindow(800, 400, "Gamma Test", NULL, NULL);
     if (!window)

tests/inputlag.c

@@ -202,6 +202,7 @@ int main(int argc, char** argv)
     glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
 
     glfwWindowHint(GLFW_SCALE_TO_MONITOR, GLFW_TRUE);
+    glfwWindowHint(GLFW_WIN32_KEYBOARD_MENU, GLFW_TRUE);
 
     window = glfwCreateWindow(width, height, "Input lag test", monitor, NULL);
     if (!window)

tests/joysticks.c

@@ -182,6 +182,7 @@ int main(void)
         exit(EXIT_FAILURE);
 
     glfwWindowHint(GLFW_SCALE_TO_MONITOR, GLFW_TRUE);
+    glfwWindowHint(GLFW_WIN32_KEYBOARD_MENU, GLFW_TRUE);
 
     window = glfwCreateWindow(800, 600, "Joystick Test", NULL, NULL);
     if (!window)

tests/opacity.c

@@ -59,6 +59,7 @@ int main(int argc, char** argv)
         exit(EXIT_FAILURE);
 
     glfwWindowHint(GLFW_SCALE_TO_MONITOR, GLFW_TRUE);
+    glfwWindowHint(GLFW_WIN32_KEYBOARD_MENU, GLFW_TRUE);
 
     window = glfwCreateWindow(400, 400, "Opacity", NULL, NULL);
     if (!window)