clients: Add a simple desktop-shell app

This just provides the background surface and the top panel.

1 files changed, 392 insertions, 0 deletions

diff --git a/clients/desktop-shell.c b/clients/desktop-shell.c
new file mode 100644
index 0000000..58d47a8
--- /dev/null
+++ b/clients/desktop-shell.c
@@ -0,0 +1,392 @@
+/*
+ * Copyright © 2011 Kristian Høgsberg
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <math.h>
+#include <cairo.h>
+#include <sys/wait.h>
+#include <linux/input.h>
+
+#include "wayland-client.h"
+#include "wayland-glib.h"
+#include "window.h"
+
+#include <desktop-shell-client-protocol.h>
+
+struct desktop {
+	struct display *display;
+	struct desktop_shell *shell;
+	struct panel *panel;
+	struct window *background;
+	const char *background_path;
+};
+
+struct panel {
+	struct window *window;
+	struct wl_list item_list;
+	struct panel_item *focus;
+};
+
+struct panel_item {
+	struct wl_list link;
+	cairo_surface_t *icon;
+	int x, y, width, height;
+	int pressed;
+	const char *path;
+};
+
+static void
+sigchild_handler(int s)
+{
+	int status;
+	pid_t pid;
+
+	while (pid = waitpid(-1, &status, WNOHANG), pid > 0)
+		fprintf(stderr, "child %d exited\n", pid);
+}
+
+static void
+panel_activate_item(struct panel *panel, struct panel_item *item)
+{
+	pid_t pid;
+
+	pid = fork();
+	if (pid < 0) {
+		fprintf(stderr, "fork failed: %m\n");
+		return;
+	}
+
+	if (pid)
+		return;
+	
+	if (execl(item->path, item->path, NULL) < 0) {
+		fprintf(stderr, "execl failed: %m\n");
+		exit(1);
+	}
+}
+
+static struct panel_item *
+panel_find_item(struct panel *panel, int32_t x, int32_t y)
+{
+	struct panel_item *item;
+
+	wl_list_for_each(item, &panel->item_list, link) {
+		if (item->x <= x && x < item->x + item->width &&
+		    item->y <= y && y < item->y + item->height) {
+			return item;
+		}
+	}
+
+	return NULL;
+}
+
+static void
+panel_draw_item(struct panel *panel, cairo_t *cr, struct panel_item *item)
+{
+	int x, y;
+
+	if (item->pressed) {
+		x = item->x + 1;
+		y = item->y + 1;
+	} else {
+		x = item->x;
+		y = item->y;
+	}
+
+	cairo_set_source_surface(cr, item->icon, x, y);
+	cairo_paint(cr);
+
+	if (panel->focus == item) {
+		cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 0.4);
+		cairo_mask_surface(cr, item->icon, x, y);
+	}
+}
+
+static void
+panel_redraw_handler(struct window *window, void *data)
+{
+	cairo_surface_t *surface;
+	cairo_t *cr;
+	struct panel *panel = window_get_user_data(window);
+	struct panel_item *item;
+
+	window_draw(window);
+	surface = window_get_surface(window);
+	cr = cairo_create(surface);
+	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+	cairo_set_source_rgba(cr, 0.1, 0.1, 0.1, 0.9);
+	cairo_paint(cr);
+
+	cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
+	wl_list_for_each(item, &panel->item_list, link)
+		panel_draw_item(panel, cr, item);
+
+	cairo_destroy(cr);
+	cairo_surface_destroy(surface);
+	window_flush(window);
+}
+
+static void
+panel_set_focus(struct panel *panel, struct panel_item *focus)
+{
+	if (focus == panel->focus)
+		return;
+
+	panel->focus = focus;
+	window_schedule_redraw(panel->window);
+}
+
+static int
+panel_enter_handler(struct window *window,
+		    struct input *input, uint32_t time,
+		    int32_t x, int32_t y, void *data)
+{
+	struct panel *panel = data;
+	struct panel_item *item;
+
+	item = panel_find_item(panel, x, y);
+	panel_set_focus(panel, item);
+
+	return POINTER_LEFT_PTR;
+}
+
+static void
+panel_leave_handler(struct window *window,
+		    struct input *input, uint32_t time, void *data)
+{
+	struct panel *panel = data;
+
+	panel_set_focus(panel, NULL);
+}
+
+static int
+panel_motion_handler(struct window *window,
+		     struct input *input, uint32_t time,
+		     int32_t x, int32_t y,
+		     int32_t sx, int32_t sy, void *data)
+{
+	struct panel *panel = data;
+	struct panel_item *item;
+
+	if (panel->focus && panel->focus->pressed)
+		return POINTER_LEFT_PTR;
+
+	item = panel_find_item(panel, sx, sy);
+	panel_set_focus(panel, item);
+
+	return POINTER_LEFT_PTR;
+}
+
+static void
+panel_button_handler(struct window *window,
+		     struct input *input, uint32_t time,
+		     int button, int state, void *data)
+{
+	struct panel *panel = data;
+	struct panel_item *item;
+	int32_t x, y;
+
+	if (panel->focus && button == BTN_LEFT) {
+		panel->focus->pressed = state;
+		window_schedule_redraw(panel->window);
+
+		if (state == 0) {
+			panel_activate_item(panel, panel->focus);
+
+			input_get_position(input, &x, &y);
+			item = panel_find_item(panel, x, y);
+			panel_set_focus(panel, item);
+		}
+	}
+}
+
+static struct panel *
+panel_create(struct display *display)
+{
+	struct panel *panel;
+
+	panel = malloc(sizeof *panel);
+	memset(panel, 0, sizeof *panel);
+	wl_list_init(&panel->item_list);
+
+	panel->window = window_create(display, 0, 0);
+
+	window_set_title(panel->window, "panel");
+	window_set_decoration(panel->window, 0);
+	window_set_redraw_handler(panel->window, panel_redraw_handler);
+	window_set_custom(panel->window);
+	window_set_user_data(panel->window, panel);
+	window_set_enter_handler(panel->window, panel_enter_handler);
+	window_set_leave_handler(panel->window, panel_leave_handler);
+	window_set_motion_handler(panel->window, panel_motion_handler);
+	window_set_button_handler(panel->window, panel_button_handler);
+
+	return panel;
+}
+
+static void
+panel_add_item(struct panel *panel, const char *icon, const char *path)
+{
+	struct panel_item *item;
+
+	item = malloc(sizeof *item);
+	memset(item, 0, sizeof *item);
+	item->icon = cairo_image_surface_create_from_png(icon);
+	item->path = strdup(path);
+	wl_list_insert(panel->item_list.prev, &item->link);
+
+	item->width = cairo_image_surface_get_width(item->icon);
+	item->height = cairo_image_surface_get_height(item->icon);
+}
+
+static void
+panel_allocate(struct panel *panel, int width, int height)
+{
+	struct panel_item *item;
+	int x;
+
+	window_set_child_size(panel->window, width, height);
+	window_schedule_redraw(panel->window);
+
+	x = 10;
+	wl_list_for_each(item, &panel->item_list, link) {
+		item->x = x;
+		item->y = (height - item->height) / 2;
+		x += item->width + 10;
+	}
+}
+
+static void
+background_draw(struct window *window, int width, int height, const char *path)
+{
+	cairo_surface_t *surface, *image;
+	cairo_t *cr;
+
+	window_set_child_size(window, width, height);
+	window_draw(window);
+	surface = window_get_surface(window);
+
+	cr = cairo_create(surface);
+	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+	cairo_set_source_rgba(cr, 0.0, 0.0, 0.2, 1.0);
+	cairo_paint(cr);
+
+	if (path) {
+		image = cairo_image_surface_create_from_png(path);
+		cairo_set_source_surface(cr, image, 0, 0);
+		cairo_paint(cr);
+	}
+
+	cairo_destroy(cr);
+	cairo_surface_destroy(surface);
+	window_flush(window);
+}
+
+static void
+desktop_shell_configure(void *data,
+			struct desktop_shell *desktop_shell,
+			uint32_t time, uint32_t edges,
+			struct wl_surface *surface,
+			int32_t width, int32_t height)
+{
+	struct desktop *desktop = data;
+
+	if (surface == window_get_wl_surface(desktop->panel->window)) {
+		panel_allocate(desktop->panel, width, 32);
+	} else if (surface == window_get_wl_surface(desktop->background)) {
+		background_draw(desktop->background,
+				width, height, desktop->background_path);
+	}
+}
+
+static const struct desktop_shell_listener listener = {
+	desktop_shell_configure
+};
+
+static void
+global_handler(struct wl_display *display, uint32_t id,
+	       const char *interface, uint32_t version, void *data)
+{
+	struct desktop *desktop = data;
+
+	if (!strcmp(interface, "desktop_shell")) {
+		desktop->shell =
+			wl_display_bind(display, id, &desktop_shell_interface);
+		desktop_shell_add_listener(desktop->shell, &listener, desktop);
+	}
+}
+
+static const struct {
+	const char *icon;
+	const char *path;
+} launchers[] = {
+	{
+		"/usr/share/icons/gnome/24x24/apps/utilities-terminal.png",
+		"/usr/bin/gnome-terminal"
+	},
+	{
+		"/usr/share/icons/hicolor/24x24/apps/google-chrome.png",
+		"/usr/bin/google-chrome"
+	},
+};
+
+int main(int argc, char *argv[])
+{
+	struct desktop desktop;
+	int i;
+
+	desktop.display = display_create(&argc, &argv, NULL);
+	if (desktop.display == NULL) {
+		fprintf(stderr, "failed to create display: %m\n");
+		return -1;
+	}
+
+	wl_display_add_global_listener(display_get_display(desktop.display),
+				       global_handler, &desktop);
+
+	desktop.panel = panel_create(desktop.display);
+
+	for (i = 0; i < ARRAY_LENGTH(launchers); i++)
+		panel_add_item(desktop.panel,
+			       launchers[i].icon, launchers[i].path);
+
+	desktop_shell_set_panel(desktop.shell,
+				window_get_wl_surface(desktop.panel->window));
+
+	desktop.background = window_create(desktop.display, 0, 0);
+	window_set_decoration(desktop.background, 0);
+	window_set_custom(desktop.background);
+	desktop.background_path = argv[1];
+	desktop_shell_set_background(desktop.shell,
+				     window_get_wl_surface(desktop.background));
+
+	signal(SIGCHLD, sigchild_handler);
+
+	display_run(desktop.display);
+
+	return 0;
+}