simple-example.c

/* This entire file is licensed under MIT
 *
 * Copyright 2020 Sophie Winter
 *
 * 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 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.
 */

#include "gtk-layer-shell.h"
#include <gtk/gtk.h>

static void
activate (GtkApplication* app, void *_data)
{
    (void)_data;

    // Create a normal GTK window however you like
    GtkWindow *gtk_window = GTK_WINDOW (gtk_application_window_new (app));

    // Before the window is first realized, set it up to be a layer surface
    gtk_layer_init_for_window (gtk_window);

    // Order below normal windows
    gtk_layer_set_layer (gtk_window, GTK_LAYER_SHELL_LAYER_BOTTOM);

    // Push other windows out of the way
    gtk_layer_auto_exclusive_zone_enable (gtk_window);

    // We don't need to get keyboard input
    // gtk_layer_set_keyboard_mode (gtk_window, GTK_LAYER_SHELL_KEYBOARD_MODE_NONE); // NONE is default

    // The margins are the gaps around the window's edges
    // Margins and anchors can be set like this...
    gtk_layer_set_margin (gtk_window, GTK_LAYER_SHELL_EDGE_LEFT, 40);
    gtk_layer_set_margin (gtk_window, GTK_LAYER_SHELL_EDGE_RIGHT, 40);
    gtk_layer_set_margin (gtk_window, GTK_LAYER_SHELL_EDGE_TOP, 20);
    // gtk_layer_set_margin (gtk_window, GTK_LAYER_SHELL_EDGE_BOTTOM, 0); // 0 is default

    // ... or like this
    // Anchors are if the window is pinned to each edge of the output
    static const gboolean anchors[] = {TRUE, TRUE, FALSE, TRUE};
    for (int i = 0; i < GTK_LAYER_SHELL_EDGE_ENTRY_NUMBER; i++) {
        gtk_layer_set_anchor (gtk_window, i, anchors[i]);
    }

    // Set up a widget
    GtkWidget *label = gtk_label_new ("");
    gtk_label_set_markup (GTK_LABEL (label),
                          "<span font_desc=\"20.0\">"
                              "GTK Layer Shell example!"
                          "</span>");
    gtk_container_add (GTK_CONTAINER (gtk_window), label);
    gtk_container_set_border_width (GTK_CONTAINER (gtk_window), 12);
    gtk_widget_show_all (GTK_WIDGET (gtk_window));
}

int
main (int argc, char **argv)
{
    GtkApplication * app = gtk_application_new ("sh.wmww.gtk-layer-example", G_APPLICATION_FLAGS_NONE);
    g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
    int status = g_application_run (G_APPLICATION (app), argc, argv);
    g_object_unref (app);
    return status;
}