Add glfwRequestWindowAttention

Related to #988.

src/cocoa_window.m

@@ -1277,6 +1277,11 @@ void _glfwPlatformHideWindow(_GLFWwindow* window)
     [window->ns.object orderOut:nil];
 }
 
+void _glfwPlatformRequestWindowAttention(_GLFWwindow* window)
+{
+    [NSApp requestUserAttention:NSInformationalRequest];
+}
+
 void _glfwPlatformFocusWindow(_GLFWwindow* window)
 {
     // Make us the active application

src/internal.h

@@ -630,6 +630,7 @@ void _glfwPlatformIconifyWindow(_GLFWwindow* window);
 void _glfwPlatformRestoreWindow(_GLFWwindow* window);
 void _glfwPlatformMaximizeWindow(_GLFWwindow* window);
 void _glfwPlatformShowWindow(_GLFWwindow* window);
+void _glfwPlatformRequestWindowAttention(_GLFWwindow* window);
 void _glfwPlatformHideWindow(_GLFWwindow* window);
 void _glfwPlatformFocusWindow(_GLFWwindow* window);
 void _glfwPlatformSetWindowMonitor(_GLFWwindow* window, _GLFWmonitor* monitor, int xpos, int ypos, int width, int height, int refreshRate);

src/mir_window.c

@@ -570,6 +570,10 @@ void _glfwPlatformShowWindow(_GLFWwindow* window)
     mir_window_spec_release(spec);
 }
 
+void _glfwPlatformRequestWindowAttention(_GLFWwindow* window)
+{
+}
+
 void _glfwPlatformFocusWindow(_GLFWwindow* window)
 {
     _glfwInputError(GLFW_PLATFORM_ERROR,

src/null_window.c

@@ -172,6 +172,11 @@ void _glfwPlatformShowWindow(_GLFWwindow* window)
 {
 }
 
+
+void _glfwPlatformRequestWindowAttention(_GLFWwindow* window)
+{
+}
+
 void _glfwPlatformUnhideWindow(_GLFWwindow* window)
 {
 }

src/win32_window.c

@@ -1316,6 +1316,11 @@ void _glfwPlatformHideWindow(_GLFWwindow* window)
     ShowWindow(window->win32.handle, SW_HIDE);
 }
 
+void _glfwPlatformRequestWindowAttention(_GLFWwindow* window)
+{
+    FlashWindow(window->win32.handle, TRUE);
+}
+
 void _glfwPlatformFocusWindow(_GLFWwindow* window)
 {
     BringWindowToTop(window->win32.handle);

src/window.c

@@ -675,6 +675,16 @@ GLFWAPI void glfwShowWindow(GLFWwindow* handle)
     _glfwPlatformFocusWindow(window);
 }
 
+GLFWAPI void glfwRequestWindowAttention(GLFWwindow* handle)
+{
+    _GLFWwindow* window = (_GLFWwindow*) handle;
+    assert(window != NULL);
+
+    _GLFW_REQUIRE_INIT();
+
+    _glfwPlatformRequestWindowAttention(window);
+}
+
 GLFWAPI void glfwHideWindow(GLFWwindow* handle)
 {
     _GLFWwindow* window = (_GLFWwindow*) handle;

src/wl_window.c

@@ -599,6 +599,10 @@ void _glfwPlatformHideWindow(_GLFWwindow* window)
     }
 }
 
+void _glfwPlatformRequestWindowAttention(_GLFWwindow* window)
+{
+}
+
 void _glfwPlatformFocusWindow(_GLFWwindow* window)
 {
     _glfwInputError(GLFW_PLATFORM_ERROR,

src/x11_init.c

@@ -438,6 +438,8 @@ static void detectEWMH(void)
         getSupportedAtom(supportedAtoms, atomCount, "_NET_WM_STATE_MAXIMIZED_VERT");
     _glfw.x11.NET_WM_STATE_MAXIMIZED_HORZ =
         getSupportedAtom(supportedAtoms, atomCount, "_NET_WM_STATE_MAXIMIZED_HORZ");
+    _glfw.x11.NET_WM_STATE_DEMANDS_ATTENTION =
+        getSupportedAtom(supportedAtoms, atomCount, "_NET_WM_STATE_DEMANDS_ATTENTION");
     _glfw.x11.NET_WM_FULLSCREEN_MONITORS =
         getSupportedAtom(supportedAtoms, atomCount, "_NET_WM_FULLSCREEN_MONITORS");
     _glfw.x11.NET_WM_WINDOW_TYPE =

src/x11_platform.h

@@ -193,6 +193,7 @@ typedef struct _GLFWlibraryX11
     Atom            NET_WM_STATE_FULLSCREEN;
     Atom            NET_WM_STATE_MAXIMIZED_VERT;
     Atom            NET_WM_STATE_MAXIMIZED_HORZ;
+    Atom            NET_WM_STATE_DEMANDS_ATTENTION;
     Atom            NET_WM_BYPASS_COMPOSITOR;
     Atom            NET_WM_FULLSCREEN_MONITORS;
     Atom            NET_ACTIVE_WINDOW;

src/x11_window.c

@@ -2077,6 +2077,21 @@ void _glfwPlatformHideWindow(_GLFWwindow* window)
     XFlush(_glfw.x11.display);
 }
 
+void _glfwPlatformRequestWindowAttention(_GLFWwindow* window)
+{
+    XEvent xev;
+
+    memset(&xev, 0, sizeof(xev));
+    xev.type = ClientMessage;
+    xev.xclient.window = window->x11.handle;
+    xev.xclient.message_type = _glfw.x11.NET_WM_STATE;
+    xev.xclient.format = 32;
+    xev.xclient.data.l[0] = _NET_WM_STATE_ADD;
+    xev.xclient.data.l[1] = _glfw.x11.NET_WM_STATE_DEMANDS_ATTENTION;
+
+    XSendEvent(_glfw.x11.display, DefaultRootWindow(_glfw.x11.display), False, SubstructureRedirectMask | SubstructureNotifyMask, &xev);
+}
+
 void _glfwPlatformFocusWindow(_GLFWwindow* window)
 {
     if (_glfw.x11.NET_ACTIVE_WINDOW)