438 lines
17 KiB
C
438 lines
17 KiB
C
/*
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* vim:ts=8:expandtab
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*
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* i3 - an improved dynamic tiling window manager
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*
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* © 2009 Michael Stapelberg and contributors
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*
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* See file LICENSE for license information.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#include <assert.h>
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#include <time.h>
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#include <unistd.h>
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#include <xcb/xcb.h>
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#include <xcb/xinerama.h>
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#include "queue.h"
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#include "i3.h"
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#include "data.h"
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#include "table.h"
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#include "util.h"
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#include "xinerama.h"
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#include "layout.h"
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#include "xcb.h"
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#include "config.h"
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#include "workspace.h"
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#include "log.h"
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/* This TAILQ of i3Screens stores the virtual screens, used for handling overlapping screens
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* (xrandr --same-as) */
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struct screens_head *virtual_screens;
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static bool xinerama_enabled = true;
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/*
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* Returns true if both screen objects describe the same screen (checks their
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* size and position).
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*
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*/
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bool screens_are_equal(i3Screen *screen1, i3Screen *screen2) {
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/* If one of both objects (or both) are NULL, we cannot compare them */
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if (screen1 == NULL || screen2 == NULL)
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return false;
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/* If the pointers are equal, take the short-circuit */
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if (screen1 == screen2)
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return true;
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/* Compare their size - other properties are not relevant to determine
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* if a screen is equal to another one */
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return (memcmp(&(screen1->rect), &(screen2->rect), sizeof(Rect)) == 0);
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}
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/*
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* Looks in virtual_screens for the i3Screen whose start coordinates are x, y
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*
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*/
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i3Screen *get_screen_at(int x, int y, struct screens_head *screenlist) {
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i3Screen *screen;
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TAILQ_FOREACH(screen, screenlist, screens)
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if (screen->rect.x == x && screen->rect.y == y)
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return screen;
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return NULL;
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}
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/*
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* Looks in virtual_screens for the i3Screen which contains coordinates x, y
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*
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*/
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i3Screen *get_screen_containing(int x, int y) {
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i3Screen *screen;
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TAILQ_FOREACH(screen, virtual_screens, screens) {
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DLOG("comparing x=%d y=%d with x=%d and y=%d width %d height %d\n",
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x, y, screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
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if (x >= screen->rect.x && x < (screen->rect.x + screen->rect.width) &&
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y >= screen->rect.y && y < (screen->rect.y + screen->rect.height))
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return screen;
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}
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return NULL;
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}
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/*
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* Gets the screen which is the last one in the given direction, for example the screen
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* on the most bottom when direction == D_DOWN, the screen most right when direction == D_RIGHT
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* and so on.
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*
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* This function always returns a screen.
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*
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*/
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i3Screen *get_screen_most(direction_t direction, i3Screen *current) {
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i3Screen *screen, *candidate = NULL;
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int position = 0;
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TAILQ_FOREACH(screen, virtual_screens, screens) {
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/* Repeated calls of WIN determine the winner of the comparison */
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#define WIN(variable, condition) \
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if (variable condition) { \
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candidate = screen; \
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position = variable; \
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} \
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break;
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if (((direction == D_UP) || (direction == D_DOWN)) &&
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(current->rect.x != screen->rect.x))
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continue;
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if (((direction == D_LEFT) || (direction == D_RIGHT)) &&
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(current->rect.y != screen->rect.y))
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continue;
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switch (direction) {
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case D_UP:
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WIN(screen->rect.y, <= position);
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case D_DOWN:
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WIN(screen->rect.y, >= position);
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case D_LEFT:
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WIN(screen->rect.x, <= position);
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case D_RIGHT:
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WIN(screen->rect.x, >= position);
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}
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}
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assert(candidate != NULL);
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return candidate;
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}
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static void initialize_screen(xcb_connection_t *conn, i3Screen *screen, Workspace *workspace) {
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i3Font *font = load_font(conn, config.font);
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workspace->screen = screen;
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screen->current_workspace = workspace;
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/* Create a bar for each screen */
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Rect bar_rect = {screen->rect.x,
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screen->rect.y + screen->rect.height - (font->height + 6),
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screen->rect.x + screen->rect.width,
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font->height + 6};
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uint32_t mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK;
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uint32_t values[] = {1, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS};
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screen->bar = create_window(conn, bar_rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, true, mask, values);
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screen->bargc = xcb_generate_id(conn);
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xcb_create_gc(conn, screen->bargc, screen->bar, 0, 0);
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SLIST_INIT(&(screen->dock_clients));
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DLOG("that is virtual screen at %d x %d with %d x %d\n",
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screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
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}
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/*
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* Fills virtual_screens with exactly one screen with width/height of the whole X server.
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*
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*/
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static void disable_xinerama(xcb_connection_t *conn) {
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xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
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i3Screen *s = calloc(sizeof(i3Screen), 1);
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s->rect.x = 0;
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s->rect.y = 0;
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s->rect.width = root_screen->width_in_pixels;
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s->rect.height = root_screen->height_in_pixels;
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num_screens = 1;
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s->num = 0;
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TAILQ_INSERT_TAIL(virtual_screens, s, screens);
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xinerama_enabled = false;
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}
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/*
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* Gets the Xinerama screens and converts them to virtual i3Screens (only one screen for two
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* Xinerama screen which are configured in clone mode) in the given screenlist
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*
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*/
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static void query_screens(xcb_connection_t *conn, struct screens_head *screenlist) {
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xcb_xinerama_query_screens_reply_t *reply;
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xcb_xinerama_screen_info_t *screen_info;
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time_t before_trying = time(NULL);
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/* Try repeatedly to find screens (there might be short timeframes in
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* which the X server does not return any screens, such as when rotating
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* screens), but not longer than 5 seconds (strictly speaking, only four
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* seconds of trying are guaranteed due to the 1-second-resolution) */
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while ((time(NULL) - before_trying) < 10) {
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reply = xcb_xinerama_query_screens_reply(conn, xcb_xinerama_query_screens_unchecked(conn), NULL);
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if (!reply) {
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ELOG("Couldn't get Xinerama screens\n");
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return;
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}
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screen_info = xcb_xinerama_query_screens_screen_info(reply);
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int screens = xcb_xinerama_query_screens_screen_info_length(reply);
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num_screens = 0;
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for (int screen = 0; screen < screens; screen++) {
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i3Screen *s = get_screen_at(screen_info[screen].x_org, screen_info[screen].y_org, screenlist);
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if (s != NULL) {
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DLOG("Re-used old Xinerama screen %p\n", s);
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/* This screen already exists. We use the littlest screen so that the user
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can always see the complete workspace */
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s->rect.width = min(s->rect.width, screen_info[screen].width);
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s->rect.height = min(s->rect.height, screen_info[screen].height);
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} else {
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s = calloc(sizeof(i3Screen), 1);
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DLOG("Created new Xinerama screen %p\n", s);
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s->rect.x = screen_info[screen].x_org;
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s->rect.y = screen_info[screen].y_org;
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s->rect.width = screen_info[screen].width;
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s->rect.height = screen_info[screen].height;
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/* We always treat the screen at 0x0 as the primary screen */
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if (s->rect.x == 0 && s->rect.y == 0)
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TAILQ_INSERT_HEAD(screenlist, s, screens);
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else TAILQ_INSERT_TAIL(screenlist, s, screens);
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num_screens++;
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}
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DLOG("found Xinerama screen: %d x %d at %d x %d\n",
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screen_info[screen].width, screen_info[screen].height,
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screen_info[screen].x_org, screen_info[screen].y_org);
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}
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free(reply);
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if (num_screens == 0) {
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ELOG("No screens found. This is weird. Trying again...\n");
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/* Give the scheduler a chance to do something else
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* and don’t hog the CPU */
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usleep(250);
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continue;
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}
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break;
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}
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if (num_screens == 0) {
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ELOG("No screens found for 10 seconds. Please fix your setup. i3 will exit now.\n");
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exit(0);
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}
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}
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/*
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* We have just established a connection to the X server and need the initial Xinerama
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* information to setup workspaces for each screen.
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*
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*/
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void initialize_xinerama(xcb_connection_t *conn) {
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virtual_screens = scalloc(sizeof(struct screens_head));
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TAILQ_INIT(virtual_screens);
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if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
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DLOG("Xinerama extension not found, disabling.\n");
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disable_xinerama(conn);
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} else {
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xcb_xinerama_is_active_reply_t *reply;
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reply = xcb_xinerama_is_active_reply(conn, xcb_xinerama_is_active(conn), NULL);
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if (reply == NULL || !reply->state) {
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DLOG("Xinerama is not active (in your X-Server), disabling.\n");
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disable_xinerama(conn);
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} else
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query_screens(conn, virtual_screens);
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FREE(reply);
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}
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i3Screen *screen;
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num_screens = 0;
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/* Just go through each workspace and associate as many screens as we can. */
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TAILQ_FOREACH(screen, virtual_screens, screens) {
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screen->num = num_screens;
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num_screens++;
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Workspace *ws = get_first_workspace_for_screen(virtual_screens, screen);
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initialize_screen(conn, screen, ws);
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}
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}
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/*
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* This is called when the rootwindow receives a configure_notify event and therefore the
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* number/position of the Xinerama screens could have changed.
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*
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*/
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void xinerama_requery_screens(xcb_connection_t *conn) {
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i3Font *font = load_font(conn, config.font);
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/* POSSIBLE PROBLEM: Is the order of the Xinerama screens always constant? That is, can
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it change when I move the --right-of video projector to --left-of? */
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if (!xinerama_enabled) {
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DLOG("Xinerama is disabled\n");
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return;
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}
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/* We use a separate copy to diff with the previous set of screens */
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struct screens_head *new_screens = scalloc(sizeof(struct screens_head));
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TAILQ_INIT(new_screens);
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query_screens(conn, new_screens);
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i3Screen *first = TAILQ_FIRST(new_screens),
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*screen,
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*old_screen;
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int screen_count = 0;
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/* Mark each workspace which currently is assigned to a screen, so we
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* can garbage-collect afterwards */
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Workspace *ws;
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TAILQ_FOREACH(ws, workspaces, workspaces)
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ws->reassigned = (ws->screen == NULL);
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TAILQ_FOREACH(screen, new_screens, screens) {
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screen->num = screen_count;
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screen->current_workspace = NULL;
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TAILQ_FOREACH(old_screen, virtual_screens, screens) {
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if (old_screen->num != screen_count)
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continue;
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DLOG("Found a matching screen\n");
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/* Use the same workspace */
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screen->current_workspace = old_screen->current_workspace;
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/* Re-use the old bar window */
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screen->bar = old_screen->bar;
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screen->bargc = old_screen->bargc;
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DLOG("old_screen->bar = %p\n", old_screen->bar);
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Rect bar_rect = {screen->rect.x,
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screen->rect.y + screen->rect.height - (font->height + 6),
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screen->rect.width,
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font->height + 6};
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DLOG("configuring bar to be at %d x %d with %d x %d\n",
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bar_rect.x, bar_rect.y, bar_rect.height, bar_rect.width);
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xcb_configure_window(conn, screen->bar, XCB_CONFIG_WINDOW_X |
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XCB_CONFIG_WINDOW_Y |
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XCB_CONFIG_WINDOW_WIDTH |
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XCB_CONFIG_WINDOW_HEIGHT, &(bar_rect.x));
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/* Copy the list head for the dock clients */
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screen->dock_clients = old_screen->dock_clients;
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SLIST_INIT(&(old_screen->dock_clients));
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/* Update the dimensions */
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Workspace *ws;
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TAILQ_FOREACH(ws, workspaces, workspaces) {
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if (ws->screen != old_screen)
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continue;
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DLOG("re-assigning ws %d\n", ws->num);
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memcpy(&(ws->rect), &(screen->rect), sizeof(Rect));
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ws->screen = screen;
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ws->reassigned = true;
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}
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break;
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}
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if (screen->current_workspace == NULL) {
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/* Find the first unused workspace, preferring the ones
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* which are assigned to this screen and initialize
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* the screen with it. */
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DLOG("getting first ws for screen %p\n", screen);
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Workspace *ws = get_first_workspace_for_screen(new_screens, screen);
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initialize_screen(conn, screen, ws);
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ws->reassigned = true;
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/* As this workspace just got visible (we got a new screen
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* without workspace), we need to map its clients */
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workspace_map_clients(conn, ws);
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}
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screen_count++;
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}
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/* check for dock_clients which are out of bounds */
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TAILQ_FOREACH(old_screen, virtual_screens, screens) {
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if (SLIST_EMPTY(&(old_screen->dock_clients)))
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continue;
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DLOG("dock_clients out of bounds at screen %p, reassigning\n", old_screen);
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if (SLIST_EMPTY(&(first->dock_clients))) {
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first->dock_clients = old_screen->dock_clients;
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continue;
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}
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/* We need to merge the lists */
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Client *dock_client;
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while (!SLIST_EMPTY(&(old_screen->dock_clients))) {
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dock_client = SLIST_FIRST(&(old_screen->dock_clients));
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SLIST_INSERT_HEAD(&(first->dock_clients), dock_client, dock_clients);
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SLIST_REMOVE_HEAD(&(old_screen->dock_clients), dock_clients);
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}
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}
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/* Check for workspaces which are out of bounds */
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TAILQ_FOREACH(ws, workspaces, workspaces) {
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if (ws->reassigned)
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continue;
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DLOG("Closing bar window (%p)\n", ws->screen->bar);
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xcb_destroy_window(conn, ws->screen->bar);
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DLOG("Workspace %d's screen out of bounds, assigning to first screen\n", ws->num + 1);
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workspace_assign_to(ws, first);
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}
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xcb_flush(conn);
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/* Free the old list */
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while (!TAILQ_EMPTY(virtual_screens)) {
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screen = TAILQ_FIRST(virtual_screens);
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TAILQ_REMOVE(virtual_screens, screen, screens);
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free(screen);
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}
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free(virtual_screens);
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virtual_screens = new_screens;
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/* Check for workspaces which need to be assigned to specific screens
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* which may now be available */
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TAILQ_FOREACH(ws, workspaces, workspaces) {
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if (ws->preferred_screen == NULL || ws->screen == NULL)
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continue;
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workspace_initialize(ws, ws->screen, true);
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}
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DLOG("Current workspace is now: %d\n", first->current_workspace);
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render_layout(conn);
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}
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