5 files changed, 431 insertions, 3 deletions

diff --git a/applets/wncklet/Makefile.am b/applets/wncklet/Makefile.am
index b933f81b..e6844963 100644
--- a/applets/wncklet/Makefile.am
+++ b/applets/wncklet/Makefile.am
@@ -23,6 +23,14 @@ WNCKLET_SOURCES = \
 	showdesktop.h \
 	$(BUILT_SOURCES)
 
+if ENABLE_WAYLAND
+WNCKLET_SOURCES += \
+	wayland-backend.c \
+	wayland-backend.h \
+	wayland-protocol/wlr-foreign-toplevel-management-unstable-v1-code.c \
+	wayland-protocol/wlr-foreign-toplevel-management-unstable-v1-client.h
+endif
+
 WNCKLET_LDADD =						\
 	../../libmate-panel-applet/libmate-panel-applet-4.la	\
 	$(WNCKLET_LIBS)					\
diff --git a/applets/wncklet/org.mate.panel.Wncklet.mate-panel-applet.desktop.in.in b/applets/wncklet/org.mate.panel.Wncklet.mate-panel-applet.desktop.in.in
index 490edcc1..99e7815c 100644
--- a/applets/wncklet/org.mate.panel.Wncklet.mate-panel-applet.desktop.in.in
+++ b/applets/wncklet/org.mate.panel.Wncklet.mate-panel-applet.desktop.in.in
@@ -37,7 +37,7 @@ Description=Switch between open windows using buttons
 # Translators: Do NOT translate or transliterate this text (this is an icon file name)!
 Icon=mate-panel-window-list
 MateComponentId=OAFIID:MATE_TasklistApplet;OAFIID:MATE_WindowListApplet;
-Platforms=X11;
+Platforms=X11;Wayland;
 X-MATE-Bugzilla-Bugzilla=MATE
 X-MATE-Bugzilla-Product=mate-panel
 X-MATE-Bugzilla-Component=window list
diff --git a/applets/wncklet/wayland-backend.c b/applets/wncklet/wayland-backend.c
new file mode 100644
index 00000000..d51fb7d0
--- /dev/null
+++ b/applets/wncklet/wayland-backend.c
@@ -0,0 +1,366 @@
+/* Wncklet applet Wayland backend */
+
+/*
+ * Copyright (C) 2019 William Wold
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <config.h>
+
+#ifndef HAVE_WAYLAND
+#error file should only be compiled when HAVE_WAYLAND is enabled
+#endif
+
+#include <gdk/gdkwayland.h>
+
+#include "wayland-backend.h"
+#include "wayland-protocol/wlr-foreign-toplevel-management-unstable-v1-client.h"
+
+static const int window_button_width = 140;
+
+typedef struct
+{
+	GtkWidget *list;
+	GtkWidget *outer_box;
+	struct zwlr_foreign_toplevel_manager_v1 *manager;
+} TasklistManager;
+
+typedef struct
+{
+	GtkWidget *button;
+	GtkWidget *label;
+	struct zwlr_foreign_toplevel_handle_v1 *toplevel;
+	gboolean active;
+} ToplevelTask;
+
+static const char *tasklist_manager_key = "tasklist_manager";
+static const char *toplevel_task_key = "toplevel_task";
+
+static gboolean has_initialized = FALSE;
+static struct wl_registry *wl_registry_global = NULL;
+static uint32_t foreign_toplevel_manager_global_id = 0;
+static uint32_t foreign_toplevel_manager_global_version = 0;
+
+static TasklistManager *tasklist_manager_new ();
+static ToplevelTask *toplevel_task_new (TasklistManager *tasklist, struct zwlr_foreign_toplevel_handle_v1 *handle);
+
+static void
+wl_registry_handle_global (void *_data,
+			   struct wl_registry *registry,
+			   uint32_t id,
+			   const char *interface,
+			   uint32_t version)
+{
+	// pull out needed globals
+	if (strcmp (interface, zwlr_foreign_toplevel_manager_v1_interface.name) == 0)
+	{
+		g_warn_if_fail (zwlr_foreign_toplevel_manager_v1_interface.version == 2);
+		foreign_toplevel_manager_global_id = id;
+		foreign_toplevel_manager_global_version =
+			MIN((uint32_t)zwlr_foreign_toplevel_manager_v1_interface.version, version);
+	}
+}
+
+static void
+wl_registry_handle_global_remove (void *_data,
+				  struct wl_registry *_registry,
+				  uint32_t id)
+{
+	if (id == foreign_toplevel_manager_global_id)
+	{
+		foreign_toplevel_manager_global_id = 0;
+	}
+}
+
+static const struct wl_registry_listener wl_registry_listener = {
+    .global = wl_registry_handle_global,
+    .global_remove = wl_registry_handle_global_remove,
+};
+
+static void
+wayland_tasklist_init_if_needed ()
+{
+	if (has_initialized)
+		return;
+
+	GdkDisplay *gdk_display = gdk_display_get_default ();
+	g_return_if_fail (gdk_display);
+	g_return_if_fail (GDK_IS_WAYLAND_DISPLAY (gdk_display));
+
+	struct wl_display *wl_display = gdk_wayland_display_get_wl_display (gdk_display);
+	wl_registry_global = wl_display_get_registry (wl_display);
+	wl_registry_add_listener (wl_registry_global, &wl_registry_listener, NULL);
+	wl_display_roundtrip (wl_display);
+
+	if (!foreign_toplevel_manager_global_id)
+		g_warning ("%s not supported by Wayland compositor",
+			   zwlr_foreign_toplevel_manager_v1_interface.name);
+
+	has_initialized = TRUE;
+}
+
+static void
+foreign_toplevel_manager_handle_toplevel (void *data,
+					  struct zwlr_foreign_toplevel_manager_v1 *manager,
+					  struct zwlr_foreign_toplevel_handle_v1 *toplevel)
+{
+	TasklistManager *tasklist = data;
+	ToplevelTask *task = toplevel_task_new (tasklist, toplevel);
+	gtk_box_pack_start (GTK_BOX (tasklist->list), task->button, TRUE, TRUE, 2);
+}
+
+static void
+foreign_toplevel_manager_handle_finished (void *data,
+					  struct zwlr_foreign_toplevel_manager_v1 *manager)
+{
+	TasklistManager *tasklist = data;
+
+	tasklist->manager = NULL;
+	zwlr_foreign_toplevel_manager_v1_destroy (manager);
+
+	if (tasklist->outer_box)
+		g_object_set_data (G_OBJECT (tasklist->outer_box),
+				   tasklist_manager_key,
+				   NULL);
+
+	g_free (tasklist);
+}
+
+static const struct zwlr_foreign_toplevel_manager_v1_listener foreign_toplevel_manager_listener = {
+	.toplevel = foreign_toplevel_manager_handle_toplevel,
+	.finished = foreign_toplevel_manager_handle_finished,
+};
+
+static void
+tasklist_manager_disconnected_from_widget (TasklistManager *tasklist)
+{
+	if (tasklist->list)
+	{
+		GList *children = gtk_container_get_children (GTK_CONTAINER (tasklist->list));
+		for (GList *iter = children; iter != NULL; iter = g_list_next (iter))
+			gtk_widget_destroy (GTK_WIDGET (iter->data));
+		g_list_free(children);
+		tasklist->list = NULL;
+	}
+
+	if (tasklist->outer_box)
+		tasklist->outer_box = NULL;
+
+	if (tasklist->manager)
+		zwlr_foreign_toplevel_manager_v1_stop (tasklist->manager);
+}
+
+static TasklistManager *
+tasklist_manager_new ()
+{
+	if (!foreign_toplevel_manager_global_id)
+		return NULL;
+
+	TasklistManager *tasklist = g_new0 (TasklistManager, 1);
+	tasklist->list = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 2);
+	gtk_box_set_homogeneous (GTK_BOX (tasklist->list), TRUE);
+	tasklist->outer_box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
+	gtk_box_pack_start (GTK_BOX (tasklist->outer_box), tasklist->list, FALSE, FALSE, 0);
+	gtk_widget_show (tasklist->list);
+	tasklist->manager = wl_registry_bind (wl_registry_global,
+					     foreign_toplevel_manager_global_id,
+					     &zwlr_foreign_toplevel_manager_v1_interface,
+					     foreign_toplevel_manager_global_version);
+	zwlr_foreign_toplevel_manager_v1_add_listener (tasklist->manager,
+						       &foreign_toplevel_manager_listener,
+						       tasklist);
+	g_object_set_data_full (G_OBJECT (tasklist->outer_box),
+				tasklist_manager_key,
+				tasklist,
+				(GDestroyNotify)tasklist_manager_disconnected_from_widget);
+	return tasklist;
+}
+
+static void
+foreign_toplevel_handle_title (void *data,
+			       struct zwlr_foreign_toplevel_handle_v1 *toplevel,
+			       const char *title)
+{
+	ToplevelTask *task = data;
+
+	if (task->label)
+	{
+		gtk_label_set_label (GTK_LABEL (task->label), title);
+	}
+}
+
+static void
+foreign_toplevel_handle_app_id (void *data,
+				struct zwlr_foreign_toplevel_handle_v1 *toplevel,
+				const char *app_id)
+{
+	// ignore
+}
+
+static void
+foreign_toplevel_handle_output_enter (void *data,
+				      struct zwlr_foreign_toplevel_handle_v1 *toplevel,
+				      struct wl_output *output)
+{
+	// ignore
+}
+
+static void
+foreign_toplevel_handle_output_leave (void *data,
+				      struct zwlr_foreign_toplevel_handle_v1 *toplevel,
+				      struct wl_output *output)
+{
+	// ignore
+}
+
+static void
+foreign_toplevel_handle_state (void *data,
+			       struct zwlr_foreign_toplevel_handle_v1 *toplevel,
+			       struct wl_array *state)
+{
+	ToplevelTask *task = data;
+
+	task->active = FALSE;
+
+	enum zwlr_foreign_toplevel_handle_v1_state *i;
+	wl_array_for_each (i, state)
+	{
+		switch (*i)
+		{
+		case ZWLR_FOREIGN_TOPLEVEL_HANDLE_V1_STATE_ACTIVATED:
+			task->active = TRUE;
+			break;
+
+		default:
+			break;
+		}
+	}
+
+	gtk_button_set_relief (GTK_BUTTON (task->button), task->active ? GTK_RELIEF_NORMAL : GTK_RELIEF_NONE);
+}
+
+static void
+foreign_toplevel_handle_done (void *data,
+			      struct zwlr_foreign_toplevel_handle_v1 *toplevel)
+{
+	// ignore
+}
+
+static void
+foreign_toplevel_handle_closed (void *data,
+				struct zwlr_foreign_toplevel_handle_v1 *toplevel)
+{
+	ToplevelTask *task = data;
+	if (task->button)
+		gtk_widget_destroy (task->button);
+}
+
+
+static const struct zwlr_foreign_toplevel_handle_v1_listener foreign_toplevel_handle_listener = {
+	.title = foreign_toplevel_handle_title,
+	.app_id = foreign_toplevel_handle_app_id,
+	.output_enter = foreign_toplevel_handle_output_enter,
+	.output_leave = foreign_toplevel_handle_output_leave,
+	.state = foreign_toplevel_handle_state,
+	.done = foreign_toplevel_handle_done,
+	.closed = foreign_toplevel_handle_closed,
+};
+
+static void
+toplevel_task_disconnected_from_widget (ToplevelTask *task)
+{
+	struct zwlr_foreign_toplevel_handle_v1 *toplevel = task->toplevel;
+
+	task->button = NULL;
+	task->label = NULL;
+	task->toplevel = NULL;
+
+	if (toplevel)
+		zwlr_foreign_toplevel_handle_v1_destroy (toplevel);
+
+	g_free (task);
+}
+
+static void
+toplevel_task_handle_clicked (GtkButton *button, ToplevelTask *task)
+{
+	if (task->toplevel)
+	{
+		if (task->active)
+		{
+			zwlr_foreign_toplevel_handle_v1_set_minimized (task->toplevel);
+		}
+		else
+		{
+			GdkDisplay *gdk_display = gtk_widget_get_display (GTK_WIDGET (button));
+			GdkSeat *gdk_seat = gdk_display_get_default_seat (gdk_display);
+			struct wl_seat *wl_seat = gdk_wayland_seat_get_wl_seat (gdk_seat);
+			zwlr_foreign_toplevel_handle_v1_activate (task->toplevel, wl_seat);
+		}
+	}
+}
+
+static ToplevelTask *
+toplevel_task_new (TasklistManager *tasklist, struct zwlr_foreign_toplevel_handle_v1 *toplevel)
+{
+	ToplevelTask *task = g_new0 (ToplevelTask, 1);
+
+	task->button = gtk_button_new ();
+	g_signal_connect (task->button, "clicked", G_CALLBACK (toplevel_task_handle_clicked), task);
+
+	task->label = gtk_label_new ("");
+	gtk_label_set_max_width_chars (GTK_LABEL (task->label), 1);
+	gtk_widget_set_size_request (task->label, window_button_width, -1);
+	gtk_label_set_ellipsize (GTK_LABEL (task->label), PANGO_ELLIPSIZE_END);
+	gtk_container_add (GTK_CONTAINER(task->button), task->label);
+
+	gtk_widget_show_all (task->button);
+
+	task->toplevel = toplevel;
+	zwlr_foreign_toplevel_handle_v1_add_listener (toplevel,
+						      &foreign_toplevel_handle_listener,
+						      task);
+	g_object_set_data_full (G_OBJECT (task->button),
+				toplevel_task_key,
+				task,
+				(GDestroyNotify)toplevel_task_disconnected_from_widget);
+	return task;
+}
+
+GtkWidget*
+wayland_tasklist_new ()
+{
+	wayland_tasklist_init_if_needed ();
+	TasklistManager *tasklist = tasklist_manager_new ();
+	if (!tasklist)
+		return gtk_label_new ("Shell does not support WLR Foreign Toplevel Control");
+	return tasklist->outer_box;
+}
+
+static TasklistManager *
+tasklist_widget_get_tasklist (GtkWidget* tasklist_widget)
+{
+	return g_object_get_data (G_OBJECT (tasklist_widget), tasklist_manager_key);
+}
+
+void
+wayland_tasklist_set_orientation (GtkWidget* tasklist_widget, GtkOrientation orient)
+{
+	TasklistManager *tasklist = tasklist_widget_get_tasklist (tasklist_widget);
+	gtk_orientable_set_orientation (GTK_ORIENTABLE (tasklist->list), orient);
+	gtk_orientable_set_orientation (GTK_ORIENTABLE (tasklist->outer_box), orient);
+}
diff --git a/applets/wncklet/wayland-backend.h b/applets/wncklet/wayland-backend.h
new file mode 100644
index 00000000..d3ce93da
--- /dev/null
+++ b/applets/wncklet/wayland-backend.h
@@ -0,0 +1,48 @@
+/* Wncklet applet Wayland backend */
+
+/*
+ * Copyright (C) 2019 William Wold
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef _WNCKLET_APPLET_WAYLAND_BACKEND_H_
+#define _WNCKLET_APPLET_WAYLAND_BACKEND_H_
+
+#ifdef PACKAGE_NAME // only check HAVE_WAYLAND if config.h has been included
+#ifndef HAVE_WAYLAND
+#error file should only be included when HAVE_WAYLAND is enabled
+#endif
+#endif
+
+#include <gtk/gtk.h>
+#include <gdk/gdk.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+GtkWidget* wayland_tasklist_new (void);
+void wayland_tasklist_set_orientation (GtkWidget* tasklist_widget, GtkOrientation orient);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // _WNCKLET_APPLET_WAYLAND_BACKEND_H_
+
+
diff --git a/applets/wncklet/window-list.c b/applets/wncklet/window-list.c
index 54105f60..5c336259 100644
--- a/applets/wncklet/window-list.c
+++ b/applets/wncklet/window-list.c
@@ -27,6 +27,7 @@
 
 #ifdef HAVE_WAYLAND
 #include <gdk/gdkwayland.h>
+#include "wayland-backend.h"
 #endif // HAVE_WAYLAND
 
 #define MATE_DESKTOP_USE_UNSTABLE_API
@@ -138,7 +139,12 @@ static void tasklist_apply_orientation(TasklistData* tasklist)
 	}
 #endif // HAVE_X11
 
-	// Not yet implemented for Wayland
+#ifdef HAVE_WAYLAND
+	if (GDK_IS_WAYLAND_DISPLAY(gdk_display_get_default()))
+	{
+		wayland_tasklist_set_orientation(tasklist->tasklist, tasklist->orientation);
+	}
+#endif
 }
 
 static void tasklist_set_button_relief(TasklistData* tasklist, GtkReliefStyle relief)
@@ -759,7 +765,7 @@ gboolean window_list_applet_fill(MatePanelApplet* applet)
 #ifdef HAVE_WAYLAND
 	if (GDK_IS_WAYLAND_DISPLAY (gdk_display_get_default ()))
 	{
-		tasklist->tasklist = gtk_label_new ("[Tasklist not supported on Wayland]");
+		tasklist->tasklist = wayland_tasklist_new();
 	}
 	else
 #endif // HAVE_WAYLAND