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c4c918cb06
i3/i3bar/src/xcb.c
Axel Wagner c4c918cb06 Make hide_on_modifier configurable
2010-08-26 00:02:35 +02:00

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/*
* i3bar - an xcb-based status- and ws-bar for i3
*
* © 2010 Axel Wagner and contributors
*
* See file LICNSE for license information
*
* src/xcb.c: Communicating with X
*
*/
#include <xcb/xcb.h>
#include <xcb/xproto.h>
#include <xcb/xcb_event.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <i3/ipc.h>
#include <ev.h>
#include <X11/Xlib.h>
#include <X11/XKBlib.h>
#include <X11/extensions/XKB.h>
#include "common.h"
/* We save the Atoms in an easy to access array, indexed by an enum */
#define NUM_ATOMS 3
enum {
#define ATOM_DO(name) name,
#include "xcb_atoms.def"
};
xcb_intern_atom_cookie_t atom_cookies[NUM_ATOMS];
xcb_atom_t atoms[NUM_ATOMS];
/* Variables, that are the same for all functions at all times */
xcb_connection_t *xcb_connection;
xcb_screen_t *xcb_screens;
xcb_window_t xcb_root;
xcb_font_t xcb_font;
Display *xkb_dpy;
int xkb_event_base;
int mod_pressed;
/* Event-Watchers, to interact with the user */
ev_prepare *xcb_prep;
ev_check *xcb_chk;
ev_io *xcb_io;
ev_io *xkb_io;
/*
* Converts a colorstring to a colorpixel as expected from xcb_change_gc.
* s is assumed to be in the format "rrggbb"
*
*/
uint32_t get_colorpixel(const char *s) {
char strings[3][3] = { { s[0], s[1], '\0'} ,
{ s[2], s[3], '\0'} ,
{ s[4], s[5], '\0'} };
uint8_t r = strtol(strings[0], NULL, 16);
uint8_t g = strtol(strings[1], NULL, 16);
uint8_t b = strtol(strings[2], NULL, 16);
return (r << 16 | g << 8 | b);
}
/*
* Hides all bars (unmaps them)
*
*/
void hide_bars() {
if (!config.hide_on_modifier) {
return;
}
i3_output *walk;
SLIST_FOREACH(walk, outputs, slist) {
xcb_unmap_window(xcb_connection, walk->bar);
}
stop_child();
}
/*
* Unhides all bars (maps them)
*
*/
void unhide_bars() {
if (!config.hide_on_modifier) {
return;
}
i3_output *walk;
xcb_void_cookie_t cookie;
xcb_generic_error_t *err;
uint32_t mask;
uint32_t values[5];
cont_child();
SLIST_FOREACH(walk, outputs, slist) {
if (walk->bar == XCB_NONE) {
continue;
}
mask = XCB_CONFIG_WINDOW_X |
XCB_CONFIG_WINDOW_Y |
XCB_CONFIG_WINDOW_WIDTH |
XCB_CONFIG_WINDOW_HEIGHT |
XCB_CONFIG_WINDOW_STACK_MODE;
values[0] = walk->rect.x;
values[1] = walk->rect.y + walk->rect.h - font_height - 6;
values[2] = walk->rect.w;
values[3] = font_height + 6;
values[4] = XCB_STACK_MODE_ABOVE;
printf("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
cookie = xcb_configure_window_checked(xcb_connection,
walk->bar,
mask,
values);
if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
printf("ERROR: Could not reconfigure window. XCB-errorcode: %d\n", err->error_code);
exit(EXIT_FAILURE);
}
xcb_map_window(xcb_connection, walk->bar);
}
}
/*
* Handle a button-press-event (i.c. a mouse click on one of our bars).
* We determine, wether the click occured on a ws-button or if the scroll-
* wheel was used and change the workspace appropriately
*
*/
void handle_button(xcb_button_press_event_t *event) {
i3_ws *cur_ws;
/* Determine, which bar was clicked */
i3_output *walk;
xcb_window_t bar = event->event;
SLIST_FOREACH(walk, outputs, slist) {
if (walk->bar == bar) {
break;
}
}
if (walk == NULL) {
printf("Unknown Bar klicked!\n");
return;
}
/* TODO: Move this to exern get_ws_for_output() */
TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
if (cur_ws->visible) {
break;
}
}
if (cur_ws == NULL) {
printf("No Workspace active?\n");
return;
}
int32_t x = event->event_x;
printf("Got Button %d\n", event->detail);
switch (event->detail) {
case 1:
/* Left Mousbutton. We determine, which button was clicked
* and set cur_ws accordingly */
TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
printf("x = %d\n", x);
if (x < cur_ws->name_width + 10) {
break;
}
x -= cur_ws->name_width + 10;
}
if (cur_ws == NULL) {
return;
}
break;
case 4:
/* Mouse wheel down. We select the next ws */
if (cur_ws == TAILQ_FIRST(walk->workspaces)) {
cur_ws = TAILQ_LAST(walk->workspaces, ws_head);
} else {
cur_ws = TAILQ_PREV(cur_ws, ws_head, tailq);
}
break;
case 5:
/* Mouse wheel up. We select the previos ws */
if (cur_ws == TAILQ_LAST(walk->workspaces, ws_head)) {
cur_ws = TAILQ_FIRST(walk->workspaces);
} else {
cur_ws = TAILQ_NEXT(cur_ws, tailq);
}
break;
}
char buffer[50];
snprintf(buffer, 50, "%d", cur_ws->num);
i3_send_msg(I3_IPC_MESSAGE_TYPE_COMMAND, buffer);
}
/*
* This function is called immediately bevor the main loop locks. We flush xcb
* then (and only then)
*
*/
void xcb_prep_cb(struct ev_loop *loop, ev_prepare *watcher, int revenst) {
xcb_flush(xcb_connection);
}
/*
* This function is called immediately after the main loop locks, so when one
* of the watchers registered an event.
* We check wether an X-Event arrived and handle it.
*
*/
void xcb_chk_cb(struct ev_loop *loop, ev_check *watcher, int revents) {
xcb_generic_event_t *event;
while ((event = xcb_poll_for_event(xcb_connection)) == NULL) {
return;
}
switch (event->response_type & ~0x80) {
case XCB_EXPOSE:
/* Expose-events happen, when the window needs to be redrawn */
draw_bars();
break;
case XCB_BUTTON_PRESS:
/* Button-press-events are mouse-buttons clicked on one of our bars */
handle_button((xcb_button_press_event_t*) event);
break;
}
FREE(event);
}
/*
* Dummy Callback. We only need this, so that the Prepare- and Check-Watchers
* are triggered
*
*/
void xcb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
}
/*
* We need to bind to the modifier per XKB. Sadly, XCB does not implement this
*
*/
void xkb_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
XkbEvent ev;
int modstate;
printf("Got XKB-Event!\n");
while (XPending(xkb_dpy)) {
XNextEvent(xkb_dpy, (XEvent*)&ev);
if (ev.type != xkb_event_base) {
printf("ERROR: No Xkb-Event!\n");
continue;
}
if (ev.any.xkb_type != XkbStateNotify) {
printf("ERROR: No State Notify!\n");
continue;
}
unsigned int mods = ev.state.mods;
modstate = mods & Mod4Mask;
}
if (modstate != mod_pressed) {
if (modstate == 0) {
printf("Mod4 got released!\n");
hide_bars();
} else {
printf("Mod4 got pressed!\n");
unhide_bars();
}
mod_pressed = modstate;
}
}
/*
* Calculate the rendered width of a string with the configured font.
* The string has to be encoded in ucs2 and glyph_len has to be the length
* of the string (in width)
*
*/
int get_string_width(xcb_char2b_t *string, int glyph_len) {
xcb_query_text_extents_cookie_t cookie;
xcb_query_text_extents_reply_t *reply;
xcb_generic_error_t *error = NULL;
int width;
cookie = xcb_query_text_extents(xcb_connection, xcb_font, glyph_len, string);
reply = xcb_query_text_extents_reply(xcb_connection, cookie, &error);
if (error != NULL) {
printf("ERROR: Could not get text extents! XCB-errorcode: %d\n", error->error_code);
exit(EXIT_FAILURE);
}
width = reply->overall_width;
free(reply);
return width;
}
/*
* Initialize xcb and use the specified fontname for text-rendering
*
*/
void init_xcb(char *fontname) {
/* FIXME: xcb_connect leaks Memory */
xcb_connection = xcb_connect(NULL, NULL);
if (xcb_connection_has_error(xcb_connection)) {
printf("Cannot open display\n");
exit(EXIT_FAILURE);
}
printf("Connected to xcb\n");
/* We have to request the atoms we need */
#define ATOM_DO(name) atom_cookies[name] = xcb_intern_atom(xcb_connection, 0, strlen(#name), #name);
#include "xcb_atoms.def"
xcb_screens = xcb_setup_roots_iterator(xcb_get_setup(xcb_connection)).data;
xcb_root = xcb_screens->root;
/* We load and allocate the font */
xcb_font = xcb_generate_id(xcb_connection);
xcb_void_cookie_t open_font_cookie;
open_font_cookie = xcb_open_font_checked(xcb_connection,
xcb_font,
strlen(fontname),
fontname);
xcb_generic_error_t *err = xcb_request_check(xcb_connection,
open_font_cookie);
if (err != NULL) {
printf("ERROR: Could not open font! XCB-Error-Code: %d\n", err->error_code);
exit(EXIT_FAILURE);
}
/* We also need the fontheight to configure our bars accordingly */
xcb_list_fonts_with_info_cookie_t font_info_cookie;
font_info_cookie = xcb_list_fonts_with_info(xcb_connection,
1,
strlen(fontname),
fontname);
if (config.hide_on_modifier) {
int xkb_major, xkb_minor, xkb_errbase, xkb_err;
xkb_major = XkbMajorVersion;
xkb_minor = XkbMinorVersion;
xkb_dpy = XkbOpenDisplay(":0",
&xkb_event_base,
&xkb_errbase,
&xkb_major,
&xkb_minor,
&xkb_err);
if (xkb_dpy == NULL) {
printf("ERROR: No XKB!\n");
exit(EXIT_FAILURE);
}
if (fcntl(ConnectionNumber(xkb_dpy), F_SETFD, FD_CLOEXEC) == -1) {
fprintf(stderr, "Could not set FD_CLOEXEC on xkbdpy\n");
exit(EXIT_FAILURE);
}
int i1;
if (!XkbQueryExtension(xkb_dpy, &i1, &xkb_event_base, &xkb_errbase, &xkb_major, &xkb_minor)) {
printf("ERROR: XKB not supported by X-server!\n");
exit(EXIT_FAILURE);
}
if (!XkbSelectEvents(xkb_dpy, XkbUseCoreKbd, XkbStateNotifyMask, XkbStateNotifyMask)) {
printf("Could not grab Key!\n");
exit(EXIT_FAILURE);
}
xkb_io = malloc(sizeof(ev_io));
ev_io_init(xkb_io, &xkb_io_cb, ConnectionNumber(xkb_dpy), EV_READ);
ev_io_start(main_loop, xkb_io);
XFlush(xkb_dpy);
}
/* The varios Watchers to communicate with xcb */
xcb_io = malloc(sizeof(ev_io));
xcb_prep = malloc(sizeof(ev_prepare));
xcb_chk = malloc(sizeof(ev_check));
ev_io_init(xcb_io, &xcb_io_cb, xcb_get_file_descriptor(xcb_connection), EV_READ);
ev_prepare_init(xcb_prep, &xcb_prep_cb);
ev_check_init(xcb_chk, &xcb_chk_cb);
ev_io_start(main_loop, xcb_io);
ev_prepare_start(main_loop, xcb_prep);
ev_check_start(main_loop, xcb_chk);
/* Now we get the atoms and save them in a nice data-structure */
get_atoms();
/* Now we calculate the font-height */
xcb_list_fonts_with_info_reply_t *reply;
reply = xcb_list_fonts_with_info_reply(xcb_connection,
font_info_cookie,
NULL);
font_height = reply->font_ascent + reply->font_descent;
FREE(reply);
printf("Calculated Font-height: %d\n", font_height);
}
/*
* Cleanup the xcb-stuff.
* Called once, before the program terminates.
*
*/
void clean_xcb() {
i3_output *walk;
SLIST_FOREACH(walk, outputs, slist) {
destroy_window(walk);
}
FREE_SLIST(outputs, i3_output);
xcb_disconnect(xcb_connection);
ev_check_stop(main_loop, xcb_chk);
ev_prepare_stop(main_loop, xcb_prep);
ev_io_stop(main_loop, xcb_io);
FREE(xcb_chk);
FREE(xcb_prep);
FREE(xcb_io);
}
/*
* Get the earlier requested atoms and save them in the prepared data-structure
*
*/
void get_atoms() {
xcb_intern_atom_reply_t *reply;
#define ATOM_DO(name) reply = xcb_intern_atom_reply(xcb_connection, atom_cookies[name], NULL); \
if (reply == NULL) { \
printf("ERROR: Could not get atom %s\n", #name); \
exit(EXIT_FAILURE); \
} \
atoms[name] = reply->atom; \
free(reply);
#include "xcb_atoms.def"
printf("Got Atoms\n");
}
/*
* Destroy the bar of the specified output
*
*/
void destroy_window(i3_output *output) {
if (output == NULL) {
return;
}
if (output->bar == XCB_NONE) {
return;
}
xcb_destroy_window(xcb_connection, output->bar);
output->bar = XCB_NONE;
}
/*
* Reconfigure all bars and create new for newly activated outputs
*
*/
void reconfig_windows() {
uint32_t mask;
uint32_t values[5];
xcb_void_cookie_t cookie;
xcb_generic_error_t *err;
i3_output *walk;
SLIST_FOREACH(walk, outputs, slist) {
if (!walk->active) {
/* If an output is not active, we destroy it's bar */
/* FIXME: Maybe we rather want to unmap? */
printf("Destroying window for output %s\n", walk->name);
destroy_window(walk);
continue;
}
if (walk->bar == XCB_NONE) {
printf("Creating Window for output %s\n", walk->name);
walk->bar = xcb_generate_id(xcb_connection);
mask = XCB_CW_BACK_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
/* Black background */
values[0] = xcb_screens->black_pixel;
/* If hide_on_modifier is set, i3 is not supposed to manage our bar-windows */
values[1] = config.hide_on_modifier;
/* The events we want to receive */
values[2] = XCB_EVENT_MASK_EXPOSURE |
XCB_EVENT_MASK_BUTTON_PRESS;
cookie = xcb_create_window_checked(xcb_connection,
xcb_screens->root_depth,
walk->bar,
xcb_root,
walk->rect.x, walk->rect.y,
walk->rect.w, font_height + 6,
1,
XCB_WINDOW_CLASS_INPUT_OUTPUT,
xcb_screens->root_visual,
mask,
values);
if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
printf("ERROR: Could not create Window. XCB-errorcode: %d\n", err->error_code);
exit(EXIT_FAILURE);
}
/* We want dock-windows (for now) */
xcb_change_property(xcb_connection,
XCB_PROP_MODE_REPLACE,
walk->bar,
atoms[_NET_WM_WINDOW_TYPE],
atoms[ATOM],
32,
1,
(unsigned char*) &atoms[_NET_WM_WINDOW_TYPE_DOCK]);
if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
printf("ERROR: Could not set dock mode. XCB-errorcode: %d\n", err->error_code);
exit(EXIT_FAILURE);
}
/* We also want a graphics-context (the "canvas" on which we draw) */
walk->bargc = xcb_generate_id(xcb_connection);
mask = XCB_GC_FONT;
values[0] = xcb_font;
cookie = xcb_create_gc_checked(xcb_connection,
walk->bargc,
walk->bar,
mask,
values);
if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
printf("ERROR: Could not create graphical context. XCB-errorcode: %d\n", err->error_code);
exit(EXIT_FAILURE);
}
/* We finally map the bar (display it on screen) */
cookie = xcb_map_window_checked(xcb_connection, walk->bar);
if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
printf("ERROR: Could not map window. XCB-errorcode: %d\n", err->error_code);
exit(EXIT_FAILURE);
}
} else {
/* We already have a bar, so we just reconfigure it */
mask = XCB_CONFIG_WINDOW_X |
XCB_CONFIG_WINDOW_Y |
XCB_CONFIG_WINDOW_WIDTH |
XCB_CONFIG_WINDOW_HEIGHT |
XCB_CONFIG_WINDOW_STACK_MODE;
values[0] = walk->rect.x;
values[1] = walk->rect.y + walk->rect.h - font_height - 6;
values[2] = walk->rect.w;
values[3] = font_height + 6;
values[4] = XCB_STACK_MODE_ABOVE;
printf("Reconfiguring Window for output %s to %d,%d\n", walk->name, values[0], values[1]);
cookie = xcb_configure_window_checked(xcb_connection,
walk->bar,
mask,
values);
if ((err = xcb_request_check(xcb_connection, cookie)) != NULL) {
printf("ERROR: Could not reconfigure window. XCB-errorcode: %d\n", err->error_code);
exit(EXIT_FAILURE);
}
}
}
}
/*
* Render the bars, with buttons and statusline
*
*/
void draw_bars() {
printf("Drawing Bars...\n");
int i = 0;
i3_output *outputs_walk;
SLIST_FOREACH(outputs_walk, outputs, slist) {
if (!outputs_walk->active) {
printf("Output %s inactive, skipping...\n", outputs_walk->name);
continue;
}
if (outputs_walk->bar == XCB_NONE) {
reconfig_windows();
}
uint32_t color = get_colorpixel("000000");
xcb_change_gc(xcb_connection,
outputs_walk->bargc,
XCB_GC_FOREGROUND,
&color);
xcb_rectangle_t rect = { 0, 0, outputs_walk->rect.w, font_height + 6 };
xcb_poly_fill_rectangle(xcb_connection,
outputs_walk->bar,
outputs_walk->bargc,
1,
&rect);
if (statusline != NULL) {
printf("Printing statusline!\n");
xcb_change_gc(xcb_connection,
outputs_walk->bargc,
XCB_GC_BACKGROUND,
&color);
color = get_colorpixel("FFFFFF");
xcb_change_gc(xcb_connection,
outputs_walk->bargc,
XCB_GC_FOREGROUND,
&color);
int glyph_count;
xcb_char2b_t *text = (xcb_char2b_t*) convert_utf8_to_ucs2(statusline, &glyph_count);
xcb_void_cookie_t cookie;
cookie = xcb_image_text_16(xcb_connection,
glyph_count,
outputs_walk->bar,
outputs_walk->bargc,
outputs_walk->rect.w - get_string_width(text, glyph_count) - 4,
font_height + 1,
(xcb_char2b_t*) text);
xcb_generic_error_t *err = xcb_request_check(xcb_connection, cookie);
if (err != NULL) {
printf("XCB-Error: %d\n", err->error_code);
}
}
i3_ws *ws_walk;
TAILQ_FOREACH(ws_walk, outputs_walk->workspaces, tailq) {
printf("Drawing Button for WS %s at x = %d\n", ws_walk->name, i);
uint32_t color = get_colorpixel("240000");
if (ws_walk->visible) {
color = get_colorpixel("480000");
}
if (ws_walk->urgent) {
printf("WS %s is urgent!\n", ws_walk->name);
color = get_colorpixel("002400");
/* The urgent-hint should get noticed, so we unhide the bars shortly */
unhide_bars();
}
xcb_change_gc(xcb_connection,
outputs_walk->bargc,
XCB_GC_FOREGROUND,
&color);
xcb_change_gc(xcb_connection,
outputs_walk->bargc,
XCB_GC_BACKGROUND,
&color);
xcb_rectangle_t rect = { i + 1, 1, ws_walk->name_width + 8, font_height + 4 };
xcb_poly_fill_rectangle(xcb_connection,
outputs_walk->bar,
outputs_walk->bargc,
1,
&rect);
color = get_colorpixel("FFFFFF");
xcb_change_gc(xcb_connection,
outputs_walk->bargc,
XCB_GC_FOREGROUND,
&color);
xcb_image_text_16(xcb_connection,
ws_walk->name_glyphs,
outputs_walk->bar,
outputs_walk->bargc,
i + 5, font_height + 1,
ws_walk->ucs2_name);
i += 10 + ws_walk->name_width;
}
i = 0;
}
}
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