From 01fb4342ea56d467ad46a68a411ffb07b4d5d326 Mon Sep 17 00:00:00 2001
From: William Wold <wm@wmww.sh>
Date: Thu, 20 Jun 2019 18:18:30 +0000
Subject: Add Wayland backend

---
 mate-panel/Makefile.am       |  4 ++++
 mate-panel/main.c            | 10 ++++++++
 mate-panel/panel-toplevel.c  | 20 ++++++++++++++++
 mate-panel/wayland-backend.c | 57 ++++++++++++++++++++++++++++++++++++++++++++
 mate-panel/wayland-backend.h | 18 ++++++++++++++
 5 files changed, 109 insertions(+)
 create mode 100644 mate-panel/wayland-backend.c
 create mode 100644 mate-panel/wayland-backend.h

(limited to 'mate-panel')

diff --git a/mate-panel/Makefile.am b/mate-panel/Makefile.am
index e4bc90ac..4255db34 100644
--- a/mate-panel/Makefile.am
+++ b/mate-panel/Makefile.am
@@ -61,6 +61,8 @@ panel_sources = \
 	panel-reset.c
 
 if ENABLE_WAYLAND
+panel_sources += \
+	wayland-backend.c
 endif
 
 if ENABLE_X11
@@ -120,6 +122,8 @@ panel_headers = \
 	panel-schemas.h
 
 if ENABLE_WAYLAND
+panel_headers += \
+	wayland-backend.h
 endif
 
 if ENABLE_X11
diff --git a/mate-panel/main.c b/mate-panel/main.c
index 82d475c1..db1fafb4 100644
--- a/mate-panel/main.c
+++ b/mate-panel/main.c
@@ -37,6 +37,10 @@
 #include "xstuff.h"
 #endif
 
+#ifdef HAVE_WAYLAND
+#include "wayland-backend.h"
+#endif
+
 /* globals */
 GSList *panels = NULL;
 GSList *panel_list = NULL;
@@ -181,6 +185,12 @@ main (int argc, char **argv)
 
 	gboolean found_backend = FALSE;
 
+#ifdef HAVE_WAYLAND
+	if (GDK_IS_WAYLAND_DISPLAY (display)) {
+		found_backend = TRUE;
+	}
+#endif
+
 #ifdef HAVE_X11
 	if (GDK_IS_X11_DISPLAY (display)) {
 		xstuff_init ();
diff --git a/mate-panel/panel-toplevel.c b/mate-panel/panel-toplevel.c
index 8a7b6c7b..223d72b0 100644
--- a/mate-panel/panel-toplevel.c
+++ b/mate-panel/panel-toplevel.c
@@ -57,6 +57,9 @@
 #include "panel-xutils.h"
 #include "panel-struts.h"
 #endif
+#ifdef HAVE_WAYLAND
+#include "wayland-backend.h"
+#endif
 
 #define DEFAULT_SIZE              48
 #define DEFAULT_AUTO_HIDE_SIZE    1
@@ -1557,6 +1560,11 @@ static gboolean panel_toplevel_update_struts(PanelToplevel* toplevel, gboolean e
 	}
 #endif // HAVE_X11
 
+#ifdef HAVE_WAYLAND
+	if (GDK_IS_WAYLAND_DISPLAY (gtk_widget_get_display (GTK_WIDGET (toplevel)))) {
+		wayland_panel_toplevel_update_placement (toplevel);
+	}
+#endif // HAVE_WAYLAND
 	return geometry_changed;
 }
 
@@ -4815,6 +4823,12 @@ panel_toplevel_init (PanelToplevel *toplevel)
 			       toplevel);
 
 	update_style_classes (toplevel);
+
+#ifdef HAVE_WAYLAND
+	if (GDK_IS_WAYLAND_DISPLAY (gdk_display_get_default ())) {
+		wayland_panel_toplevel_init (toplevel);
+	}
+#endif // HAVE_WAYLAND
 }
 
 PanelWidget *
@@ -5059,6 +5073,12 @@ panel_toplevel_set_orientation (PanelToplevel    *toplevel,
 	g_object_notify (G_OBJECT (toplevel), "orientation");
 
 	g_object_thaw_notify (G_OBJECT (toplevel));
+
+#ifdef HAVE_WAYLAND
+	if (GDK_IS_WAYLAND_DISPLAY (gtk_widget_get_display (GTK_WIDGET (toplevel)))) {
+		wayland_panel_toplevel_update_placement (toplevel);
+	}
+#endif // HAVE_WAYLAND
 }
 
 PanelOrientation
diff --git a/mate-panel/wayland-backend.c b/mate-panel/wayland-backend.c
new file mode 100644
index 00000000..0d797f33
--- /dev/null
+++ b/mate-panel/wayland-backend.c
@@ -0,0 +1,57 @@
+#include <config.h>
+
+#include <gtk-layer-shell/gtk-layer-shell.h>
+
+#include "wayland-backend.h"
+
+void
+wayland_panel_toplevel_init (PanelToplevel* toplevel)
+{
+	GtkWindow* window;
+
+	window = GTK_WINDOW (toplevel);
+	gtk_layer_init_for_window (window);
+	gtk_layer_set_layer (window, GTK_LAYER_SHELL_LAYER_TOP);
+	gtk_layer_set_namespace (window, "panel");
+	gtk_layer_auto_exclusive_zone_enable (window);
+	wayland_panel_toplevel_update_placement (toplevel);
+}
+
+void
+wayland_panel_toplevel_update_placement (PanelToplevel* toplevel)
+{
+	GtkWindow* window;
+	gboolean expand;
+	PanelOrientation orientation;
+	gboolean anchor[GTK_LAYER_SHELL_EDGE_ENTRY_NUMBER];
+
+	window = GTK_WINDOW (toplevel);
+	expand = panel_toplevel_get_expand (toplevel);
+	orientation = panel_toplevel_get_orientation (toplevel);
+	for (int i = 0; i < GTK_LAYER_SHELL_EDGE_ENTRY_NUMBER; i++)
+		anchor[i] = expand;
+
+	switch (orientation) {
+	case PANEL_ORIENTATION_LEFT:
+		anchor[GTK_LAYER_SHELL_EDGE_LEFT] = TRUE;
+		anchor[GTK_LAYER_SHELL_EDGE_RIGHT] = FALSE;
+		break;
+	case PANEL_ORIENTATION_RIGHT:
+		anchor[GTK_LAYER_SHELL_EDGE_RIGHT] = TRUE;
+		anchor[GTK_LAYER_SHELL_EDGE_LEFT] = FALSE;
+		break;
+	case PANEL_ORIENTATION_TOP:
+		anchor[GTK_LAYER_SHELL_EDGE_TOP] = TRUE;
+		anchor[GTK_LAYER_SHELL_EDGE_BOTTOM] = FALSE;
+		break;
+	case PANEL_ORIENTATION_BOTTOM:
+		anchor[GTK_LAYER_SHELL_EDGE_BOTTOM] = TRUE;
+		anchor[GTK_LAYER_SHELL_EDGE_TOP] = FALSE;
+		break;
+	default:
+		g_warning ("Invalid panel orientation %d", orientation);
+	}
+
+	for (int i = 0; i < GTK_LAYER_SHELL_EDGE_ENTRY_NUMBER; i++)
+		gtk_layer_set_anchor (window, i, anchor[i]);
+}
diff --git a/mate-panel/wayland-backend.h b/mate-panel/wayland-backend.h
new file mode 100644
index 00000000..ae6a837f
--- /dev/null
+++ b/mate-panel/wayland-backend.h
@@ -0,0 +1,18 @@
+#ifndef __WAYLAND_BACKEND_H__
+#define __WAYLAND_BACKEND_H__
+
+#include <config.h>
+
+#ifndef HAVE_WAYLAND
+#error file should only be included when HAVE_WAYLAND is enabled
+#endif
+
+#include <gdk/gdk.h>
+#include <gdk/gdkwayland.h>
+
+#include "panel-toplevel.h"
+
+void wayland_panel_toplevel_init (PanelToplevel* toplevel);
+void wayland_panel_toplevel_update_placement (PanelToplevel* toplevel);
+
+#endif /* __WAYLAND_BACKEND_H__ */
-- 
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