Wayland: Implement glfwRequestWindowAttention

This implements window attention requests via the xdg-activation-v1
protocol.

This was updated by @ elmindreda to work with recent Wayland related
 changes to the main branch:
 - Switched to current way of handling Wayland protocol files
 - Added the xdg-activation-v1.xml protocol file to deps/wayland
 - Added missing macros to rename protocol interface globals

The protocol file was copied from wayland-protocols 1.33.

Closes #2287

CONTRIBUTORS.md

@@ -217,6 +217,7 @@ video tutorials.
  - Brandon Schaefer
  - Sebastian Schuberth
  - Scr3amer
+ - Jan Schuerkamp
  - Christian Sdunek
  - Matt Sealey
  - Steve Sexton

README.md

@@ -178,6 +178,7 @@ information on what to include when reporting a bug.
  - [Cocoa] Moved main menu creation to GLFW initialization time (#1649)
  - [Cocoa] Bugfix: Touching event queue from secondary thread before main thread
    would abort (#1649)
+ - [Wayland] Added support for `glfwRequestWindowAttention` (#2287)
  - [Wayland] Added dynamic loading of all Wayland libraries
  - [Wayland] Bugfix: `CLOCK_MONOTONIC` was not correctly enabled
  - [X11] Bugfix: Termination would segfault if the IM had been destroyed

deps/wayland/xdg-activation-v1.xml

@@ -0,0 +1,200 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="xdg_activation_v1">
+
+  <copyright>
+    Copyright © 2020 Aleix Pol Gonzalez &lt;aleixpol@kde.org&gt;
+    Copyright © 2020 Carlos Garnacho &lt;carlosg@gnome.org&gt;
+
+    Permission is hereby granted, free of charge, to any person obtaining a
+    copy of this software and associated documentation files (the "Software"),
+    to deal in the Software without restriction, including without limitation
+    the rights to use, copy, modify, merge, publish, distribute, sublicense,
+    and/or sell copies of the Software, and to permit persons to whom the
+    Software is furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice (including the next
+    paragraph) shall be included in all copies or substantial portions of the
+    Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+    DEALINGS IN THE SOFTWARE.
+  </copyright>
+
+  <description summary="Protocol for requesting activation of surfaces">
+    The way for a client to pass focus to another toplevel is as follows.
+
+    The client that intends to activate another toplevel uses the
+    xdg_activation_v1.get_activation_token request to get an activation token.
+    This token is then forwarded to the client, which is supposed to activate
+    one of its surfaces, through a separate band of communication.
+
+    One established way of doing this is through the XDG_ACTIVATION_TOKEN
+    environment variable of a newly launched child process. The child process
+    should unset the environment variable again right after reading it out in
+    order to avoid propagating it to other child processes.
+
+    Another established way exists for Applications implementing the D-Bus
+    interface org.freedesktop.Application, which should get their token under
+    activation-token on their platform_data.
+
+    In general activation tokens may be transferred across clients through
+    means not described in this protocol.
+
+    The client to be activated will then pass the token
+    it received to the xdg_activation_v1.activate request. The compositor can
+    then use this token to decide how to react to the activation request.
+
+    The token the activating client gets may be ineffective either already at
+    the time it receives it, for example if it was not focused, for focus
+    stealing prevention. The activating client will have no way to discover
+    the validity of the token, and may still forward it to the to be activated
+    client.
+
+    The created activation token may optionally get information attached to it
+    that can be used by the compositor to identify the application that we
+    intend to activate. This can for example be used to display a visual hint
+    about what application is being started.
+
+    Warning! The protocol described in this file is currently in the testing
+    phase. Backward compatible changes may be added together with the
+    corresponding interface version bump. Backward incompatible changes can
+    only be done by creating a new major version of the extension.
+  </description>
+
+  <interface name="xdg_activation_v1" version="1">
+    <description summary="interface for activating surfaces">
+      A global interface used for informing the compositor about applications
+      being activated or started, or for applications to request to be
+      activated.
+    </description>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy the xdg_activation object">
+        Notify the compositor that the xdg_activation object will no longer be
+        used.
+
+        The child objects created via this interface are unaffected and should
+        be destroyed separately.
+      </description>
+    </request>
+
+    <request name="get_activation_token">
+      <description summary="requests a token">
+        Creates an xdg_activation_token_v1 object that will provide
+        the initiating client with a unique token for this activation. This
+        token should be offered to the clients to be activated.
+      </description>
+
+      <arg name="id" type="new_id" interface="xdg_activation_token_v1"/>
+    </request>
+
+    <request name="activate">
+      <description summary="notify new interaction being available">
+        Requests surface activation. It's up to the compositor to display
+        this information as desired, for example by placing the surface above
+        the rest.
+
+        The compositor may know who requested this by checking the activation
+        token and might decide not to follow through with the activation if it's
+        considered unwanted.
+
+        Compositors can ignore unknown activation tokens when an invalid
+        token is passed.
+      </description>
+      <arg name="token" type="string" summary="the activation token of the initiating client"/>
+      <arg name="surface" type="object" interface="wl_surface"
+	   summary="the wl_surface to activate"/>
+    </request>
+  </interface>
+
+  <interface name="xdg_activation_token_v1" version="1">
+    <description summary="an exported activation handle">
+      An object for setting up a token and receiving a token handle that can
+      be passed as an activation token to another client.
+
+      The object is created using the xdg_activation_v1.get_activation_token
+      request. This object should then be populated with the app_id, surface
+      and serial information and committed. The compositor shall then issue a
+      done event with the token. In case the request's parameters are invalid,
+      the compositor will provide an invalid token.
+    </description>
+
+    <enum name="error">
+      <entry name="already_used" value="0"
+             summary="The token has already been used previously"/>
+    </enum>
+
+    <request name="set_serial">
+      <description summary="specifies the seat and serial of the activating event">
+        Provides information about the seat and serial event that requested the
+        token.
+
+        The serial can come from an input or focus event. For instance, if a
+        click triggers the launch of a third-party client, the launcher client
+        should send a set_serial request with the serial and seat from the
+        wl_pointer.button event.
+
+        Some compositors might refuse to activate toplevels when the token
+        doesn't have a valid and recent enough event serial.
+
+        Must be sent before commit. This information is optional.
+      </description>
+      <arg name="serial" type="uint"
+           summary="the serial of the event that triggered the activation"/>
+      <arg name="seat" type="object" interface="wl_seat"
+           summary="the wl_seat of the event"/>
+    </request>
+
+    <request name="set_app_id">
+      <description summary="specifies the application being activated">
+        The requesting client can specify an app_id to associate the token
+        being created with it.
+
+        Must be sent before commit. This information is optional.
+      </description>
+      <arg name="app_id" type="string"
+           summary="the application id of the client being activated."/>
+    </request>
+
+    <request name="set_surface">
+      <description summary="specifies the surface requesting activation">
+        This request sets the surface requesting the activation. Note, this is
+        different from the surface that will be activated.
+
+        Some compositors might refuse to activate toplevels when the token
+        doesn't have a requesting surface.
+
+        Must be sent before commit. This information is optional.
+      </description>
+      <arg name="surface" type="object" interface="wl_surface"
+	   summary="the requesting surface"/>
+    </request>
+
+    <request name="commit">
+      <description summary="issues the token request">
+        Requests an activation token based on the different parameters that
+        have been offered through set_serial, set_surface and set_app_id.
+      </description>
+    </request>
+
+    <event name="done">
+      <description summary="the exported activation token">
+        The 'done' event contains the unique token of this activation request
+        and notifies that the provider is done.
+      </description>
+      <arg name="token" type="string" summary="the exported activation token"/>
+    </event>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy the xdg_activation_token_v1 object">
+        Notify the compositor that the xdg_activation_token_v1 object will no
+        longer be used. The received token stays valid.
+      </description>
+    </request>
+  </interface>
+</protocol>

docs/compat.dox

@@ -140,6 +140,12 @@ GLFW itself, using the
 alongside subsurfaces.  If the running compositor does not support these
 protocols either, no decorations will be drawn around windows.
 
+GLFW uses the [xdg-activation
+protocol](https://cgit.freedesktop.org/wayland/wayland-protocols/tree/staging/xdg-activation/xdg-activation-v1.xml)
+to enable attention requests.  This protocol is part of
+wayland-protocols staging, and mandatory at build time.  If the running compositor
+does not support this protocol, the attention requests do nothing.
+
 
 @section compat_glx GLX extensions
 

src/CMakeLists.txt

@@ -101,6 +101,7 @@ if (GLFW_BUILD_WAYLAND)
     generate_wayland_protocol("idle-inhibit-unstable-v1.xml")
     generate_wayland_protocol("pointer-constraints-unstable-v1.xml")
     generate_wayland_protocol("relative-pointer-unstable-v1.xml")
+    generate_wayland_protocol("xdg-activation-v1.xml")
     generate_wayland_protocol("xdg-decoration-unstable-v1.xml")
 endif()
 

src/wl_init.c

@@ -46,6 +46,7 @@
 #include "viewporter-client-protocol.h"
 #include "relative-pointer-unstable-v1-client-protocol.h"
 #include "pointer-constraints-unstable-v1-client-protocol.h"
+#include "xdg-activation-v1-client-protocol.h"
 #include "idle-inhibit-unstable-v1-client-protocol.h"
 
 // NOTE: Versions of wayland-scanner prior to 1.17.91 named every global array of
@@ -77,6 +78,10 @@
 #include "pointer-constraints-unstable-v1-client-protocol-code.h"
 #undef types
 
+#define types _glfw_xdg_activation_types
+#include "xdg-activation-v1-client-protocol-code.h"
+#undef types
+
 #define types _glfw_idle_inhibit_types
 #include "idle-inhibit-unstable-v1-client-protocol-code.h"
 #undef types
@@ -177,6 +182,13 @@ static void registryHandleGlobal(void* userData,
                              &zwp_idle_inhibit_manager_v1_interface,
                              1);
     }
+    else if (strcmp(interface, "xdg_activation_v1") == 0)
+    {
+        _glfw.wl.activationManager =
+            wl_registry_bind(registry, name,
+                             &xdg_activation_v1_interface,
+                             1);
+    }
 }
 
 static void registryHandleGlobalRemove(void* userData,
@@ -929,6 +941,8 @@ void _glfwTerminateWayland(void)
         zwp_pointer_constraints_v1_destroy(_glfw.wl.pointerConstraints);
     if (_glfw.wl.idleInhibitManager)
         zwp_idle_inhibit_manager_v1_destroy(_glfw.wl.idleInhibitManager);
+    if (_glfw.wl.activationManager)
+        xdg_activation_v1_destroy(_glfw.wl.activationManager);
     if (_glfw.wl.registry)
         wl_registry_destroy(_glfw.wl.registry);
     if (_glfw.wl.display)

src/wl_platform.h

@@ -129,6 +129,8 @@ struct wl_output;
 #define xdg_surface_interface _glfw_xdg_surface_interface
 #define xdg_toplevel_interface _glfw_xdg_toplevel_interface
 #define xdg_wm_base_interface _glfw_xdg_wm_base_interface
+#define xdg_activation_v1_interface _glfw_xdg_activation_v1_interface
+#define xdg_activation_token_v1_interface _glfw_xdg_activation_token_v1_interface
 
 #define GLFW_WAYLAND_WINDOW_STATE         _GLFWwindowWayland  wl;
 #define GLFW_WAYLAND_LIBRARY_WINDOW_STATE _GLFWlibraryWayland wl;
@@ -406,6 +408,7 @@ typedef struct _GLFWwindowWayland
     struct zwp_confined_pointer_v1* confinedPointer;
 
     struct zwp_idle_inhibitor_v1*          idleInhibitor;
+    struct xdg_activation_token_v1*        activationToken;
 
     struct {
         struct wl_buffer*                  buffer;
@@ -434,6 +437,7 @@ typedef struct _GLFWlibraryWayland
     struct zwp_relative_pointer_manager_v1* relativePointerManager;
     struct zwp_pointer_constraints_v1*      pointerConstraints;
     struct zwp_idle_inhibit_manager_v1*     idleInhibitManager;
+    struct xdg_activation_v1*               activationManager;
 
     _GLFWofferWayland*          offers;
     unsigned int                offerCount;

src/wl_window.c

@@ -48,6 +48,7 @@
 #include "viewporter-client-protocol.h"
 #include "relative-pointer-unstable-v1-client-protocol.h"
 #include "pointer-constraints-unstable-v1-client-protocol.h"
+#include "xdg-activation-v1-client-protocol.h"
 #include "idle-inhibit-unstable-v1-client-protocol.h"
 
 #define GLFW_BORDER_SIZE    4
@@ -2054,6 +2055,9 @@ void _glfwDestroyWindowWayland(_GLFWwindow* window)
     if (window == _glfw.wl.keyboardFocus)
         _glfw.wl.keyboardFocus = NULL;
 
+    if (window->wl.activationToken)
+        xdg_activation_token_v1_destroy(window->wl.activationToken);
+
     if (window->wl.idleInhibitor)
         zwp_idle_inhibitor_v1_destroy(window->wl.idleInhibitor);
 
@@ -2335,11 +2339,38 @@ void _glfwHideWindowWayland(_GLFWwindow* window)
     }
 }
 
+static void xdgActivationHandleDone(void* userData,
+                                    struct xdg_activation_token_v1* activationToken,
+                                    const char* token)
+{
+    _GLFWwindow* window = userData;
+
+    if(activationToken != window->wl.activationToken)
+        return;
+
+    xdg_activation_v1_activate(_glfw.wl.activationManager, token, window->wl.surface);
+    xdg_activation_token_v1_destroy(window->wl.activationToken);
+    window->wl.activationToken = NULL;
+}
+
+static const struct xdg_activation_token_v1_listener xdgActivationListener =
+{
+    xdgActivationHandleDone
+};
+
 void _glfwRequestWindowAttentionWayland(_GLFWwindow* window)
 {
-    // TODO
+    if(!_glfw.wl.activationManager)
-    _glfwInputError(GLFW_FEATURE_UNIMPLEMENTED,
+        return;
-                    "Wayland: Window attention request not implemented yet");
+
+    //We're about to overwrite this with a new request
+    if(window->wl.activationToken)
+        xdg_activation_token_v1_destroy(window->wl.activationToken);
+
+    window->wl.activationToken = xdg_activation_v1_get_activation_token(_glfw.wl.activationManager);
+    xdg_activation_token_v1_add_listener(window->wl.activationToken, &xdgActivationListener, window);
+
+    xdg_activation_token_v1_commit(window->wl.activationToken);
 }
 
 void _glfwFocusWindowWayland(_GLFWwindow* window)