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Add click events to i3bar 

If the statusline generator (i.e. i3status) specifies click_events:true
in the protocol header, i3bar will write a JSON array on it's stdin
notifying it if the user clicks on a block.

The exact protocol is documented in docs/i3bar-protocol.
This commit is contained in:
enkore 2013-03-21 11:48:27 +01:00 committed by Michael Stapelberg
parent 5adb09c5fc
commit 58e68940f6
6 changed files with 208 additions and 25 deletions
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30
docs/i3bar-protocol
View File

@ -51,7 +51,7 @@ consists of a single JSON hash:
*All features example*:
------------------------------
{ "version": 1, "stop_signal": 10, "cont_signal": 12 }
{ "version": 1, "stop_signal": 10, "cont_signal": 12, "click_events": true }
------------------------------
(Note that before i3 v4.3 the precise format had to be +{"version":1}+,
@ -110,6 +110,9 @@ cont_signal::
Specify to i3bar the signal (as an integer)to send to continue your
processing.
The default value (if none is specified) is SIGCONT.
click_events::
If specified and true i3bar will write a infinite array (same as above)
to your stdin.
=== Blocks in detail
@ -210,3 +213,28 @@ An example of a block which uses all possible entries follows:
"separator_block_width": 9
}
------------------------------------------
=== Click events
If enabled i3bar will send you notifications if the user clicks on a block and
looks like this:
name::
Name of the block, if set
instance::
Instance of the block, if set
x, y::
X11 root window coordinates where the click occured
button:
X11 button ID (for example 1 to 3 for left/middle/right mouse button)
*Example*:
------------------------------------------
{
"name": "ethernet",
"instance": "eth0",
"button": 1,
"x": 1320,
"y": 1400
}
------------------------------------------

12
i3bar/include/child.h
View File

@ -33,6 +33,12 @@ typedef struct {
* The signal requested by the client to inform it of theun hidden state of i3bar
*/
int cont_signal;
/**
* Enable click events
*/
bool click_events;
bool click_events_init;
} i3bar_child;
/*
@ -68,4 +74,10 @@ void stop_child(void);
*/
void cont_child(void);
/*
* Generates a click event, if enabled.
*
*/
void send_block_clicked(int button, const char *name, const char *instance, int x, int y);
#endif

4
i3bar/include/common.h
View File

@ -54,6 +54,10 @@ struct status_block {
uint32_t x_offset;
uint32_t x_append;
/* Optional */
char *name;
char *instance;
TAILQ_ENTRY(status_block) blocks;
};

106
i3bar/src/child.c
View File

@ -21,6 +21,7 @@
#include <yajl/yajl_common.h>
#include <yajl/yajl_parse.h>
#include <yajl/yajl_version.h>
#include <yajl/yajl_gen.h>
#include "common.h"
@ -35,6 +36,9 @@ ev_child *child_sig;
yajl_callbacks callbacks;
yajl_handle parser;
/* JSON generator for stdout */
yajl_gen gen;
typedef struct parser_ctx {
/* True if one of the parsed blocks was urgent */
bool has_urgent;
@ -85,6 +89,8 @@ static int stdin_start_array(void *context) {
first = TAILQ_FIRST(&statusline_head);
I3STRING_FREE(first->full_text);
FREE(first->color);
FREE(first->name);
FREE(first->instance);
TAILQ_REMOVE(&statusline_head, first, blocks);
free(first);
}
@ -152,6 +158,18 @@ static int stdin_string(void *context, const unsigned char *val, unsigned int le
ctx->block.min_width = (uint32_t)predict_text_width(text);
i3string_free(text);
}
if (strcasecmp(ctx->last_map_key, "name") == 0) {
char *copy = (char*)malloc(len+1);
strncpy(copy, (const char *)val, len);
copy[len] = 0;
ctx->block.name = copy;
}
if (strcasecmp(ctx->last_map_key, "instance") == 0) {
char *copy = (char*)malloc(len+1);
strncpy(copy, (const char *)val, len);
copy[len] = 0;
ctx->block.instance = copy;
}
return 1;
}
@ -336,6 +354,18 @@ void child_sig_cb(struct ev_loop *loop, ev_child *watcher, int revents) {
cleanup();
}
void child_write_output(void) {
if (child.click_events) {
const unsigned char *output;
size_t size;
yajl_gen_get_buf(gen, &output, &size);
fwrite(output, 1, size, stdout);
fwrite("\n", 1, 1, stdout);
fflush(stdout);
yajl_gen_clear(gen);
}
}
/*
* Start a child-process with the specified command and reroute stdin.
* We actually start a $SHELL to execute the command so we don't have to care
@ -361,10 +391,16 @@ void start_child(char *command) {
parser = yajl_alloc(&callbacks, NULL, &parser_context);
#endif
gen = yajl_gen_alloc(NULL);
if (command != NULL) {
int fd[2];
if (pipe(fd) == -1)
err(EXIT_FAILURE, "pipe(fd)");
int pipe_in[2]; /* pipe we read from */
int pipe_out[2]; /* pipe we write to */
if (pipe(pipe_in) == -1)
err(EXIT_FAILURE, "pipe(pipe_in)");
if (pipe(pipe_out) == -1)
err(EXIT_FAILURE, "pipe(pipe_out)");
child.pid = fork();
switch (child.pid) {
@ -372,10 +408,13 @@ void start_child(char *command) {
ELOG("Couldn't fork(): %s\n", strerror(errno));
exit(EXIT_FAILURE);
case 0:
/* Child-process. Reroute stdout and start shell */
close(fd[0]);
/* Child-process. Reroute streams and start shell */
dup2(fd[1], STDOUT_FILENO);
close(pipe_in[0]);
close(pipe_out[1]);
dup2(pipe_in[1], STDOUT_FILENO);
dup2(pipe_out[0], STDIN_FILENO);
static const char *shell = NULL;
@ -385,10 +424,13 @@ void start_child(char *command) {
execl(shell, shell, "-c", command, (char*) NULL);
return;
default:
/* Parent-process. Rerout stdin */
close(fd[1]);
/* Parent-process. Reroute streams */
dup2(fd[0], STDIN_FILENO);
close(pipe_in[1]);
close(pipe_out[0]);
dup2(pipe_in[0], STDIN_FILENO);
dup2(pipe_out[1], STDOUT_FILENO);
break;
}
@ -409,6 +451,52 @@ void start_child(char *command) {
atexit(kill_child_at_exit);
}
void child_click_events_initialize(void) {
if (!child.click_events_init) {
yajl_gen_array_open(gen);
child_write_output();
child.click_events_init = true;
}
}
void child_click_events_key(const char *key) {
yajl_gen_string(gen, (const unsigned char *)key, strlen(key));
}
/*
* Generates a click event, if enabled.
*
*/
void send_block_clicked(int button, const char *name, const char *instance, int x, int y) {
if (child.click_events) {
child_click_events_initialize();
yajl_gen_map_open(gen);
if (name) {
child_click_events_key("name");
yajl_gen_string(gen, (const unsigned char *)name, strlen(name));
}
if (instance) {
child_click_events_key("instance");
yajl_gen_string(gen, (const unsigned char *)instance, strlen(instance));
}
child_click_events_key("button");
yajl_gen_integer(gen, button);
child_click_events_key("x");
yajl_gen_integer(gen, x);
child_click_events_key("y");
yajl_gen_integer(gen, y);
yajl_gen_map_close(gen);
child_write_output();
}
}
/*
* kill()s the child-process (if any). Called when exit()ing.
*

20
i3bar/src/parse_json_header.c
View File

@ -31,6 +31,7 @@ static enum {
KEY_VERSION,
KEY_STOP_SIGNAL,
KEY_CONT_SIGNAL,
KEY_CLICK_EVENTS,
NO_KEY
} current_key;
@ -54,6 +55,21 @@ static int header_integer(void *ctx, long val) {
default:
break;
}
return 1;
}
static int header_boolean(void *ctx, int val) {
i3bar_child *child = ctx;
switch (current_key) {
case KEY_CLICK_EVENTS:
child->click_events = val;
break;
default:
break;
}
return 1;
}
@ -71,13 +87,15 @@ static int header_map_key(void *ctx, const unsigned char *stringval, unsigned in
current_key = KEY_STOP_SIGNAL;
} else if (CHECK_KEY("cont_signal")) {
current_key = KEY_CONT_SIGNAL;
} else if (CHECK_KEY("click_events")) {
current_key = KEY_CLICK_EVENTS;
}
return 1;
}
static yajl_callbacks version_callbacks = {
NULL, /* null */
NULL, /* boolean */
&header_boolean, /* boolean */
&header_integer,
NULL, /* double */
NULL, /* number */

61
i3bar/src/xcb.c
View File

@ -320,24 +320,11 @@ void handle_button(xcb_button_press_event_t *event) {
}
int32_t x = event->event_x >= 0 ? event->event_x : 0;
int32_t original_x = x;
DLOG("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) {
DLOG("x = %d\n", x);
if (x >= 0 && x < cur_ws->name_width + 10) {
break;
}
x -= cur_ws->name_width + 11;
}
if (cur_ws == NULL) {
return;
}
break;
case 4:
/* Mouse wheel up. We select the previous ws, if any.
* If there is no more workspace, don’t even send the workspace
@ -358,6 +345,52 @@ void handle_button(xcb_button_press_event_t *event) {
cur_ws = TAILQ_NEXT(cur_ws, tailq);
break;
default:
/* Check if this event regards a workspace button */
TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
DLOG("x = %d\n", x);
if (x >= 0 && x < cur_ws->name_width + 10) {
break;
}
x -= cur_ws->name_width + 11;
}
if (cur_ws == NULL) {
/* No workspace button was pressed.
* Check if a status block has been clicked.
* This of course only has an effect,
* if the child reported bidirectional protocol usage. */
/* First calculate width of tray area */
trayclient *trayclient;
int tray_width = 0;
TAILQ_FOREACH_REVERSE(trayclient, walk->trayclients, tc_head, tailq) {
if (!trayclient->mapped)
continue;
tray_width += (font.height + 2);
}
int block_x = 0, last_block_x;
int offset = (walk->rect.w - (statusline_width + tray_width)) - 10;
x = original_x - offset;
if (x < 0)
return;
struct status_block *block;
TAILQ_FOREACH(block, &statusline_head, blocks) {
last_block_x = block_x;
block_x += block->width + block->x_offset + block->x_append;
if (x <= block_x && x >= last_block_x) {
send_block_clicked(event->detail, block->name, block->instance, event->root_x, event->root_y);
return;
}
}
return;
}
if (event->detail != 1)
return;
}
/* To properly handle workspace names with double quotes in them, we need