From 301a84c4f5c644697ebc36b27812ba3d972a778f Mon Sep 17 00:00:00 2001
From: Felipe Ferreira da Silva <felipefsdev@gmail.com>
Date: Tue, 21 Mar 2017 10:02:57 -0300
Subject: [PATCH] Initial implementation of window attention for X11

---
 include/GLFW/glfw3.h |  2 ++
 src/internal.h       |  1 +
 src/window.c         | 10 ++++++++++
 src/x11_window.c     | 18 ++++++++++++++++++
 4 files changed, 31 insertions(+)

diff --git a/include/GLFW/glfw3.h b/include/GLFW/glfw3.h
index 8b2efcec2..73a139df4 100644
--- a/include/GLFW/glfw3.h
+++ b/include/GLFW/glfw3.h
@@ -2698,6 +2698,8 @@ GLFWAPI void glfwMaximizeWindow(GLFWwindow* window);
  */
 GLFWAPI void glfwShowWindow(GLFWwindow* window);
 
+GLFWAPI void glfwRequestWindowAttention(GLFWwindow* window);
+
 /*! @brief Hides the specified window.
  *
  *  This function hides the specified window if it was previously visible.  If
diff --git a/src/internal.h b/src/internal.h
index be9ced898..00b362544 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -629,6 +629,7 @@ 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);
diff --git a/src/window.c b/src/window.c
index bf98723ea..546d233d8 100644
--- a/src/window.c
+++ b/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;
diff --git a/src/x11_window.c b/src/x11_window.c
index 907fa7946..48c30edb3 100644
--- a/src/x11_window.c
+++ b/src/x11_window.c
@@ -2072,6 +2072,24 @@ void _glfwPlatformShowWindow(_GLFWwindow* window)
     waitForVisibilityNotify(window);
 }
 
+void _glfwPlatformRequestWindowAttention(_GLFWwindow* window)
+{
+    XEvent xev;
+
+    Atom wm_state = XInternAtom(_glfw.x11.display, "_NET_WM_STATE", False);
+    Atom wm_attention = XInternAtom(_glfw.x11.display, "_NET_WM_STATE_DEMANDS_ATTENTION", False);
+
+    memset(&xev, 0, sizeof(xev));
+    xev.type = ClientMessage;
+    xev.xclient.window = window->x11.handle;
+    xev.xclient.message_type = wm_state;
+    xev.xclient.format = 32;
+    xev.xclient.data.l[0] = 1; /* _NET_WM_STATE_ADD */
+    xev.xclient.data.l[1] = wm_attention;
+
+    XSendEvent(_glfw.x11.display, DefaultRootWindow(_glfw.x11.display), False, SubstructureRedirectMask | SubstructureNotifyMask, &xev);
+}
+
 void _glfwPlatformHideWindow(_GLFWwindow* window)
 {
     XUnmapWindow(_glfw.x11.display, window->x11.handle);