Desktop
/* $Id: pager.c,v 1.9 2010/01/29 15:05:18 khorben Exp $ */
/* Copyright (c) 2010 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS Pager Panel */
/* 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, version 3 of the License.
*
* 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, see <http://www.gnu.org/licenses/>. */
#include <stdlib.h>
#include <string.h>
#include <gdk/gdkx.h>
#include <X11/Xatom.h>
#include "Panel.h"
/* Pager */
/* private */
/* types */
typedef enum _PagerAtom
{
PAGER_ATOM_NET_CURRENT_DESKTOP = 0,
PAGER_ATOM_NET_DESKTOP_NAMES,
PAGER_ATOM_NET_NUMBER_OF_DESKTOPS,
PAGER_ATOM_UTF8_STRING
} PagerAtom;
#define PAGER_ATOM_LAST PAGER_ATOM_UTF8_STRING
#define PAGER_ATOM_COUNT (PAGER_ATOM_LAST + 1)
typedef struct _Pager
{
GtkWidget * hbox;
GtkWidget ** widgets;
size_t widgets_cnt;
Atom atoms[PAGER_ATOM_COUNT];
GdkDisplay * display;
GdkScreen * screen;
GdkWindow * root;
} Pager;
/* constants */
static const char * _pager_atom[PAGER_ATOM_COUNT] =
{
"_NET_CURRENT_DESKTOP",
"_NET_DESKTOP_NAMES",
"_NET_NUMBER_OF_DESKTOPS",
"UTF8_STRING"
};
/* prototypes */
static GtkWidget * _pager_init(PanelApplet * applet);
static void _pager_destroy(PanelApplet * applet);
/* accessors */
static int _pager_get_current_desktop(Pager * pager);
static char ** _pager_get_desktop_names(Pager * pager);
static int _pager_get_window_property(Pager * pager, Window window,
PagerAtom property, Atom atom, unsigned long * cnt,
unsigned char ** ret);
/* useful */
static void _pager_do(Pager * pager);
/* callbacks */
static void _on_clicked(GtkWidget * widget, gpointer data);
static GdkFilterReturn _on_filter(GdkXEvent * xevent, GdkEvent * event,
gpointer data);
static void _on_screen_changed(GtkWidget * widget, GdkScreen * previous,
gpointer data);
/* public */
/* variables */
PanelApplet applet =
{
NULL,
_pager_init,
_pager_destroy,
PANEL_APPLET_POSITION_START,
FALSE,
TRUE,
NULL
};
/* private */
/* functions */
/* pager_init */
static GtkWidget * _pager_init(PanelApplet * applet)
{
Pager * pager;
if((pager = malloc(sizeof(*pager))) == NULL)
{
applet->helper->error(applet->helper->priv, "malloc", 0);
return NULL;
}
applet->priv = pager;
pager->hbox = gtk_hbox_new(TRUE, 0);
g_signal_connect(G_OBJECT(pager->hbox), "screen-changed", G_CALLBACK(
_on_screen_changed), pager);
pager->widgets = NULL;
pager->widgets_cnt = 0;
pager->screen = NULL;
pager->display = NULL;
pager->root = NULL;
return pager->hbox;
}
/* pager_destroy */
static void _pager_destroy(PanelApplet * applet)
{
Pager * pager = applet->priv;
free(pager);
}
/* accessors */
/* pager_get_current_desktop */
static int _pager_get_current_desktop(Pager * pager)
{
unsigned long cnt;
unsigned long * p;
if(_pager_get_window_property(pager, GDK_WINDOW_XWINDOW(pager->root),
PAGER_ATOM_NET_CURRENT_DESKTOP, XA_CARDINAL,
&cnt, (void*)&p) != 0)
return -1;
cnt = *p;
XFree(p);
return cnt;
}
/* pager_get_desktop_names */
static char ** _pager_get_desktop_names(Pager * pager)
{
char ** ret = NULL;
size_t ret_cnt = 0;
unsigned long cnt;
char * p;
unsigned long i;
unsigned long last = 0;
char ** q;
if(_pager_get_window_property(pager, GDK_WINDOW_XWINDOW(pager->root),
PAGER_ATOM_NET_DESKTOP_NAMES,
pager->atoms[PAGER_ATOM_UTF8_STRING], &cnt,
(void*)&p) != 0)
return NULL;
for(i = 0; i < cnt; i++)
{
if(p[i] != '\0')
continue;
if((q = realloc(ret, (ret_cnt + 2) * (sizeof(*q)))) == NULL)
{
free(ret);
XFree(p);
return NULL;
}
ret = q;
/* FIXME validate the UTF8 string */
ret[ret_cnt++] = g_strdup(&p[last]);
last = i + 1;
}
XFree(p);
if(ret == NULL)
return ret;
ret[ret_cnt] = NULL;
return ret;
}
/* pager_get_window_property */
static int _pager_get_window_property(Pager * pager, Window window,
PagerAtom property, Atom atom, unsigned long * cnt,
unsigned char ** ret)
{
int res;
Atom type;
int format;
unsigned long bytes;
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s(pager, window, %s, %lu)\n", __func__,
_pager_atom[property], atom);
#endif
res = XGetWindowProperty(GDK_DISPLAY_XDISPLAY(pager->display), window,
pager->atoms[property], 0, G_MAXLONG, False, atom,
&type, &format, cnt, &bytes, ret);
if(res != Success)
return 1;
if(type != atom)
{
if(*ret != NULL)
XFree(*ret);
*ret = NULL;
return 1;
}
return 0;
}
/* useful */
/* pager_do */
static void _pager_do(Pager * pager)
{
unsigned long cnt = 0;
unsigned long l;
unsigned long * p;
unsigned long i;
GtkWidget ** q;
int cur;
char ** names;
char buf[16];
if(_pager_get_window_property(pager, GDK_WINDOW_XWINDOW(pager->root),
PAGER_ATOM_NET_NUMBER_OF_DESKTOPS,
XA_CARDINAL, &cnt, (void*)&p) != 0)
return;
l = *p;
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s() => %ld\n", __func__, l);
#endif
XFree(p);
for(i = 0; i < pager->widgets_cnt; i++)
if(pager->widgets[i] != NULL)
{
gtk_widget_destroy(pager->widgets[i]);
pager->widgets[i] = NULL;
}
if((q = realloc(pager->widgets, l * sizeof(*q))) == NULL)
return;
pager->widgets = q;
pager->widgets_cnt = l;
cur = _pager_get_current_desktop(pager);
names = _pager_get_desktop_names(pager);
for(i = 0; i < l; i++)
{
snprintf(buf, sizeof(buf), "Desk %ld\n", i + 1);
if(names != NULL)
{
if(names[i] != NULL)
{
snprintf(buf, sizeof(buf), "%s", names[i]);
g_free(names[i]);
}
else
{
free(names);
names = NULL;
}
}
pager->widgets[i] = gtk_button_new_with_label(buf);
if(i == cur)
gtk_widget_set_sensitive(pager->widgets[i], FALSE);
g_signal_connect(G_OBJECT(pager->widgets[i]), "clicked",
G_CALLBACK(_on_clicked), pager);
gtk_box_pack_start(GTK_BOX(pager->hbox), pager->widgets[i],
FALSE, TRUE, 0);
}
free(names);
if(pager->widgets_cnt <= 1)
gtk_widget_hide(pager->hbox);
else
gtk_widget_show_all(pager->hbox);
}
/* callbacks */
/* on_clicked */
static void _on_clicked(GtkWidget * widget, gpointer data)
{
Pager * pager = data;
size_t i;
GdkScreen * screen;
GdkDisplay * display;
GdkWindow * root;
XEvent xev;
for(i = 0; i < pager->widgets_cnt; i++)
if(pager->widgets[i] == widget)
break;
if(i == pager->widgets_cnt)
return;
screen = gtk_widget_get_screen(widget);
display = gtk_widget_get_display(widget);
root = gdk_screen_get_root_window(screen);
xev.xclient.type = ClientMessage;
xev.xclient.window = GDK_WINDOW_XWINDOW(root);
xev.xclient.message_type = gdk_x11_get_xatom_by_name_for_display(
display, "_NET_CURRENT_DESKTOP");
xev.xclient.format = 32;
memset(&xev.xclient.data, 0, sizeof(xev.xclient.data));
xev.xclient.data.l[0] = i;
XSendEvent(GDK_DISPLAY_XDISPLAY(display), GDK_WINDOW_XWINDOW(root),
False,
SubstructureNotifyMask | SubstructureRedirectMask,
&xev);
}
/* on_filter */
static GdkFilterReturn _on_filter(GdkXEvent * xevent, GdkEvent * event,
gpointer data)
{
Pager * pager = data;
XEvent * xev = xevent;
int cur;
size_t i;
if(xev->type != PropertyNotify)
return GDK_FILTER_CONTINUE;
if(xev->xproperty.atom == pager->atoms[PAGER_ATOM_NET_CURRENT_DESKTOP])
{
if((cur = _pager_get_current_desktop(pager)) < 0)
return GDK_FILTER_CONTINUE;
for(i = 0; i < pager->widgets_cnt; i++)
gtk_widget_set_sensitive(pager->widgets[i], i == cur
? FALSE : TRUE);
return GDK_FILTER_CONTINUE;
}
if(xev->xproperty.atom == pager->atoms[
PAGER_ATOM_NET_NUMBER_OF_DESKTOPS]
|| xev->xproperty.atom == pager->atoms[
PAGER_ATOM_NET_DESKTOP_NAMES])
_pager_do(pager);
return GDK_FILTER_CONTINUE;
}
/* on_screen_changed */
static void _on_screen_changed(GtkWidget * widget, GdkScreen * previous,
gpointer data)
{
Pager * pager = data;
GdkEventMask events;
size_t i;
pager->screen = gtk_widget_get_screen(widget);
pager->display = gdk_screen_get_display(pager->screen);
pager->root = gdk_screen_get_root_window(pager->screen);
events = gdk_window_get_events(pager->root);
gdk_window_set_events(pager->root, events
| GDK_PROPERTY_CHANGE_MASK);
gdk_window_add_filter(pager->root, _on_filter, pager);
/* atoms */
for(i = 0; i < PAGER_ATOM_COUNT; i++)
pager->atoms[i] = gdk_x11_get_xatom_by_name_for_display(
pager->display, _pager_atom[i]);
_pager_do(pager);
}