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contrib: update layout.c for river-layout-v3

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Leon Henrik Plickat 2021-07-16 21:00:18 +02:00 committed by Isaac Freund
parent 1d000e5666
commit dfa2471141
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1 changed files with 196 additions and 112 deletions
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contrib/layout.c
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@ -10,38 +10,39 @@
* Q: Can I use this to port dwm layouts to river?
* A: Yes you can! You just need to replace the logic in layout_handle_layout_demand().
* You don't even need to fully understand the protocol if all you want to
* do is just port some simple layouts.
* do is just port some layouts.
*
* Q: I have no idea how any of this works.
* A: If all you want to do is create simple layouts, you do not need to
* understand the Wayland parts of the code. If you still want to understand
* it and are already familiar with how Wayland clients work, read the
* protocol. If you are new to writing Wayland client code, you can read
* https://wayland-book.com, then read the protocol.
* A: If all you want to do is create layouts, you do not need to understand
* the Wayland parts of the code. If you still want to understand it and are
* familiar with how Wayland clients work, read the protocol. If you are new
* to writing Wayland client code, you can read https://wayland-book.com,
* then read the protocol.
*
* Q: How do I build this?
* A: To build, you need to generate the header and code of the layout protocol
* extension and link against them. This is achieved with the following
* commands (You may want to setup a build system).
*
* wayland-scanner private-code < river-layout-v2.xml > river-layout-v2.c
* wayland-scanner client-header < river-layout-v2.xml > river-layout-v2.h
* wayland-scanner private-code < river-layout-v3.xml > river-layout-v3.c
* wayland-scanner client-header < river-layout-v3.xml > river-layout-v3.h
* gcc -Wall -Wextra -Wpedantic -Wno-unused-parameter -c -o layout.o layout.c
* gcc -Wall -Wextra -Wpedantic -Wno-unused-parameter -c -o river-layout-v2.o river-layout-v2.c
* gcc -o layout layout.o river-layout-v2.o -lwayland-client
* gcc -Wall -Wextra -Wpedantic -Wno-unused-parameter -c -o river-layout-v3.o river-layout-v3.c
* gcc -o layout layout.o river-layout-v3.o -lwayland-client
*/
#include<assert.h>
#include<stdbool.h>
#include<stdint.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include <assert.h>
#include <ctype.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include<wayland-client.h>
#include<wayland-client-protocol.h>
#include <wayland-client.h>
#include <wayland-client-protocol.h>
#include"river-layout-v2.h"
#include "river-layout-v3.h"
/* A few macros to indulge the inner glibc user. */
#define MIN(a, b) ( a < b ? a : b )
@ -53,10 +54,10 @@ struct Output
struct wl_list link;
struct wl_output *output;
struct river_layout_v2 *layout;
struct river_layout_v3 *layout;
uint32_t main_count;
double main_factor;
double main_ratio;
uint32_t view_padding;
uint32_t outer_padding;
@ -69,25 +70,23 @@ struct Output
struct wl_display *wl_display;
struct wl_registry *wl_registry;
struct wl_callback *sync_callback;
struct river_layout_manager_v2 *layout_manager;
struct river_layout_manager_v3 *layout_manager;
struct wl_list outputs;
bool loop = true;
int ret = EXIT_FAILURE;
static void layout_handle_layout_demand (void *data, struct river_layout_v2 *river_layout_v2,
static void layout_handle_layout_demand (void *data, struct river_layout_v3 *river_layout_v3,
uint32_t view_count, uint32_t width, uint32_t height, uint32_t tags, uint32_t serial)
{
struct Output *output = (struct Output *)data;
/* Simple tiled layout with no frills.
*
* If you want to create your own simple layout, just rip the following
* code out and replace it with your own logic. All content un-aware
* dynamic tiling layouts you know, for example from dwm, can be easily
* ported to river this way. If you want to create layouts that are
* content aware, meaning they react to the currently visible windows,
* you have to create handlers for the advertise_view and advertise_done
* events. Happy hacking!
* If you want to create your own layout, just rip the following code
* out and replace it with your own logic. All dynamic tiling layouts
* you know, for example from dwm, can be easily ported to river this
* way. For more creative layouts, you probably also want to add custom
* values. Happy hacking!
*/
width -= 2 * output->outer_padding, height -= 2 * output->outer_padding;
unsigned int main_size, stack_size, view_x, view_y, view_width, view_height;
@ -103,7 +102,7 @@ static void layout_handle_layout_demand (void *data, struct river_layout_v2 *riv
}
else
{
main_size = width * output->main_factor;
main_size = width * output->main_ratio;
stack_size = width - main_size;
}
for (unsigned int i = 0; i < view_count; i++)
@ -123,17 +122,28 @@ static void layout_handle_layout_demand (void *data, struct river_layout_v2 *riv
view_y = (i - output->main_count) * view_height;
}
river_layout_v2_push_view_dimensions(output->layout, serial,
river_layout_v3_push_view_dimensions(output->layout,
view_x + output->view_padding + output->outer_padding,
view_y + output->view_padding + output->outer_padding,
view_width - (2 * output->view_padding),
view_height - (2 * output->view_padding));
view_height - (2 * output->view_padding),
serial);
}
river_layout_v2_commit(output->layout, serial);
/* Committing the layout means telling the server that your code is done
* laying out windows. Make sure you have pushed exactly the right
* amount of view dimensions, a mismatch is a protocol error.
*
* You also have to provide a layout name. This is a user facing string
* that the server can forward to status bars. You can use it to tell
* the user which layout is currently in use. You could also add some
* status information about your layout, but in this example we are
* boring and just use a static "[]=" like in dwm.
*/
river_layout_v3_commit(output->layout, "[]=", serial);
}
static void layout_handle_namespace_in_use (void *data, struct river_layout_v2 *river_layout_v2)
static void layout_handle_namespace_in_use (void *data, struct river_layout_v3 *river_layout_v3)
{
/* Oh no, the namespace we choose is already used by another client!
* All we can do now is destroy the river_layout object. Because we are
@ -146,81 +156,143 @@ static void layout_handle_namespace_in_use (void *data, struct river_layout_v2 *
loop = false;
}
static void layout_handle_set_int_value (void *data, struct river_layout_v2 *river_layout_v2,
const char *name, int32_t value)
static bool skip_whitespace (char **ptr)
{
/* This event is used by the server to tell us to change the value of
* one of our layout parameters, identified by name. A layout_demand
* event will be send immediately afterwards.
if ( *ptr == NULL )
return false;
while (isspace(**ptr))
{
(*ptr)++;
if ( **ptr == '\0' )
return false;
}
return true;
}
static bool skip_nonwhitespace (char **ptr)
{
if ( *ptr == NULL )
return false;
while (! isspace(**ptr))
{
(*ptr)++;
if ( **ptr == '\0' )
return false;
}
return true;
}
static const char *get_second_word (char **ptr, const char *name)
{
/* Skip to the next word. */
if ( !skip_nonwhitespace(ptr) || !skip_whitespace(ptr) )
{
fprintf(stderr, "ERROR: Too few arguments. '%s' needs one argument.\n", name);
return NULL;
}
/* Now we know where the second word begins. */
const char *second_word = *ptr;
/* Check if there is a third word. */
if ( skip_nonwhitespace(ptr) && skip_whitespace(ptr) )
{
fprintf(stderr, "ERROR: Too many arguments. '%s' needs one argument.\n", name);
return NULL;
}
return second_word;
}
static void handle_uint32_command (char **ptr, uint32_t *value, const char *name)
{
const char *second_word = get_second_word(ptr, name);
if ( second_word == NULL )
return;
const int32_t arg = atoi(second_word);
if ( *second_word == '+' || *second_word == '-' )
*value = (uint32_t)MAX((int32_t)*value + arg, 0);
else
*value = (uint32_t)MAX(arg, 0);
}
static void handle_float_command(char **ptr, double *value, const char *name, double clamp_upper, double clamp_lower)
{
const char *second_word = get_second_word(ptr, name);
if ( second_word == NULL )
return;
const double arg = atof(second_word);
if ( *second_word == '+' || *second_word == '-' )
*value = CLAMP(*value + arg, clamp_upper, clamp_lower);
else
*value = CLAMP(arg, clamp_upper, clamp_lower);
}
static bool word_comp (const char *word, const char *comp)
{
if ( strncmp(word, comp, strlen(comp)) == 0 )
{
const char *after_comp = word + strlen(comp);
if ( isspace(*after_comp) || *after_comp == '\0' )
return true;
}
return false;
}
static void layout_handle_user_command (void *data, struct river_layout_v3 *river_layout_manager_v3,
const char *_command)
{
/* The user_command event will be received whenever the user decided to
* send us a command. As an example, commands can be used to change the
* layout values. Parsing the commands is the job of the layout
* generator, the server just sends us the raw string.
*
* After this event is recevied, the views on the output will be
* re-arranged and so we will also receive a layout_demand event.
*/
struct Output *output = (struct Output *)data;
/* All integer parameters of this layout only accept positive values. */
if ( value < 0 )
/* Skip preceding whitespace. */
char *command = (char *)_command;
if (! skip_whitespace(&command))
return;
if ( strcmp(name, "main_count") == 0 )
output->main_count = (uint32_t)value;
else if ( strcmp(name, "view_padding") == 0 )
output->view_padding = (uint32_t)value;
else if ( strcmp(name, "outer_padding") == 0 )
output->outer_padding = (uint32_t)value;
}
static void layout_handle_mod_int_value (void *data, struct river_layout_v2 *river_layout_v2,
const char *name, int32_t delta)
{
/* This event is used by the server to tell us to modify the value of
* one of our layout parameters by a delta, identified by name. A
* layout_demand event will be send immediately afterwards.
*/
struct Output *output = (struct Output *)data;
if ( strcmp(name, "main_count") == 0 )
if (word_comp(command, "main_count"))
handle_uint32_command(&command, &output->main_count, "main_count");
else if (word_comp(command, "view_padding"))
handle_uint32_command(&command, &output->view_padding, "view_padding");
else if (word_comp(command, "outer_padding"))
handle_uint32_command(&command, &output->outer_padding, "outer_padding");
else if (word_comp(command, "main_ratio"))
handle_float_command(&command, &output->main_ratio, "main_ratio", 0.1, 0.9);
else if (word_comp(command, "reset"))
{
if ( (int32_t)output->main_count + delta >= 0 )
output->main_count = output->main_count + delta;
}
else if ( strcmp(name, "view_padding") == 0 )
{
if ( (int32_t)output->view_padding + delta >= 0 )
output->view_padding = output->view_padding + delta;
}
else if ( strcmp(name, "outer_padding") == 0 )
{
if ( (int32_t)output->outer_padding + delta >= 0 )
output->outer_padding = output->outer_padding + delta;
/* This is an example of a command that does something different
* than just modifying a value. It resets all values to their
* defaults.
*/
if ( skip_nonwhitespace(&command) && skip_whitespace(&command) )
{
fputs("ERROR: Too many arguments. 'reset' has no arguments.\n", stderr);
return;
}
output->main_count = 1;
output->main_ratio = 0.6;
output->view_padding = 5;
output->outer_padding = 5;
}
else
fprintf(stderr, "ERROR: Unknown command: %s\n", command);
}
static void layout_handle_set_fixed_value (void *data, struct river_layout_v2 *river_layout_v2,
const char *name, wl_fixed_t value)
{
struct Output *output = (struct Output *)data;
if ( strcmp(name, "main_factor") == 0 )
output->main_factor = CLAMP(wl_fixed_to_double(value), 0.1, 0.9);
}
static void layout_handle_mod_fixed_value (void *data, struct river_layout_v2 *river_layout_v2,
const char *name, wl_fixed_t delta)
{
struct Output *output = (struct Output *)data;
if ( strcmp(name, "main_factor") == 0 )
output->main_factor = CLAMP(output->main_factor + wl_fixed_to_double(delta), 0.1, 0.9);
}
/* A no-op function we plug into listeners when we don't want to handle an event. */
static void noop () {}
static const struct river_layout_v2_listener layout_listener = {
static const struct river_layout_v3_listener layout_listener = {
.namespace_in_use = layout_handle_namespace_in_use,
.layout_demand = layout_handle_layout_demand,
.set_int_value = layout_handle_set_int_value,
.mod_int_value = layout_handle_mod_int_value,
.set_fixed_value = layout_handle_set_fixed_value,
.mod_fixed_value = layout_handle_mod_fixed_value,
.set_string_value = noop,
.advertise_view = noop,
.advertise_done = noop,
.user_command = layout_handle_user_command,
};
static void configure_output (struct Output *output)
@ -231,9 +303,9 @@ static void configure_output (struct Output *output)
* to use. It can be any arbitrary string. It should describe roughly
* what kind of layout your client will create, so here we use "tile".
*/
output->layout = river_layout_manager_v2_get_layout(layout_manager,
output->layout = river_layout_manager_v3_get_layout(layout_manager,
output->output, "tile");
river_layout_v2_add_listener(output->layout, &layout_listener, output);
river_layout_v3_add_listener(output->layout, &layout_listener, output);
}
static bool create_output (struct wl_output *wl_output)
@ -252,17 +324,21 @@ static bool create_output (struct wl_output *wl_output)
/* These are the parameters of our layout. In this case, they are the
* ones you'd typically expect from a dynamic tiling layout, but if you
* are creative, you can do more. You can use any arbitrary amount of
* integer, fixed and string values in your layout. If the user wants to
* change a value, the server lets us know using events of the
* river_layout object. They need to be initialiued with defaults though.
* all kinds of values in your layout. If the user wants to change a
* value, the server lets us know using user_command event of the
* river_layout object.
*
* A layout generator is responsible for having sane defaults for all
* layout values. The server only sends user_command events when there
* actually is a command the user wants to send us.
*/
output->main_count = 1;
output->main_factor = 0.6;
output->main_ratio = 0.6;
output->view_padding = 5;
output->outer_padding = 5;
/* If we already have the river_layout_manager, we can get a
* river_layout for this output.
* river_layout object for this output.
*/
if ( layout_manager != NULL )
configure_output(output);
@ -274,7 +350,7 @@ static bool create_output (struct wl_output *wl_output)
static void destroy_output (struct Output *output)
{
if ( output->layout != NULL )
river_layout_v2_destroy(output->layout);
river_layout_v3_destroy(output->layout);
wl_output_destroy(output->output);
wl_list_remove(&output->link);
free(output);
@ -290,10 +366,10 @@ static void destroy_all_outputs ()
static void registry_handle_global (void *data, struct wl_registry *registry,
uint32_t name, const char *interface, uint32_t version)
{
if (! strcmp(interface, river_layout_manager_v2_interface.name))
if ( strcmp(interface, river_layout_manager_v3_interface.name) == 0 )
layout_manager = wl_registry_bind(registry, name,
&river_layout_manager_v2_interface, 1);
else if (! strcmp(interface, wl_output_interface.name))
&river_layout_manager_v3_interface, 1);
else if ( strcmp(interface, wl_output_interface.name) == 0 )
{
struct wl_output *wl_output = wl_registry_bind(registry, name,
&wl_output_interface, version);
@ -305,6 +381,9 @@ static void registry_handle_global (void *data, struct wl_registry *registry,
}
}
/* A no-op function we plug into listeners when we don't want to handle an event. */
static void noop () {}
static const struct wl_registry_listener registry_listener = {
.global = registry_handle_global,
.global_remove = noop
@ -321,7 +400,7 @@ static void sync_handle_done (void *data, struct wl_callback *wl_callback,
*/
if ( layout_manager == NULL )
{
fputs("Wayland compositor does not support river-layout-v2.\n", stderr);
fputs("Wayland compositor does not support river-layout-v3.\n", stderr);
ret = EXIT_FAILURE;
loop = false;
return;
@ -364,11 +443,16 @@ static bool init_wayland (void)
wl_list_init(&outputs);
/* The registry is a global object which is used to advertise all
* available global objects.
*/
wl_registry = wl_display_get_registry(wl_display);
wl_registry_add_listener(wl_registry, &registry_listener, NULL);
/* The sync callback we attach here will be called when all previous
* requests have been handled by the server.
* requests have been handled by the server. This allows us to know the
* end of the startup, at which point all necessary globals should be
* bound.
*/
sync_callback = wl_display_sync(wl_display);
wl_callback_add_listener(sync_callback, &sync_callback_listener, NULL);
@ -386,7 +470,7 @@ static void finish_wayland (void)
if ( sync_callback != NULL )
wl_callback_destroy(sync_callback);
if ( layout_manager != NULL )
river_layout_manager_v2_destroy(layout_manager);
river_layout_manager_v3_destroy(layout_manager);
wl_registry_destroy(wl_registry);
wl_display_disconnect(wl_display);