i3/i3bar/src/xcb.c

#include <xcb/xcb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <i3/ipc.h>

#include "xcb.h"
#include "outputs.h"
#include "workspaces.h"
#include "ipc.h"

xcb_intern_atom_cookie_t atom_cookies[NUM_ATOMS];

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);
}

void handle_button(xcb_button_press_event_t *event) {
    i3_ws *cur_ws;
    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;
    }

    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:
            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:
            if (cur_ws == TAILQ_LAST(walk->workspaces, ws_head)) {
                cur_ws = TAILQ_FIRST(walk->workspaces);
            } else {
                cur_ws = TAILQ_NEXT(cur_ws, tailq);
            }
            break;
        case 5:
            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;
    }

    char buffer[50];
    snprintf(buffer, 50, "%d", cur_ws->num);
    i3_send_msg(I3_IPC_MESSAGE_TYPE_COMMAND, buffer);
}

void handle_xcb_event(xcb_generic_event_t *event) {
    switch (event->response_type & ~0x80) {
        case XCB_EXPOSE:
            draw_buttons();
            break;
        case XCB_BUTTON_PRESS:
            handle_button((xcb_button_press_event_t*) event);
            break;
    }
}

int get_string_width(char *string) {
    xcb_query_text_extents_cookie_t cookie;
    xcb_query_text_extents_reply_t *reply;
    xcb_generic_error_t *error;
    int width;

    cookie = xcb_query_text_extents(xcb_connection, xcb_font, strlen(string), (xcb_char2b_t*) string);
    if ((reply= xcb_query_text_extents_reply(xcb_connection, cookie, &error)) == NULL) {
        printf("ERROR: Could not get text extents!");
        return 7;
    }

    width = reply->overall_width;
    free(reply);
    return width;
}

void init_xcb() {
    /* 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;

    xcb_font = xcb_generate_id(xcb_connection);
    char *fontname = "-misc-fixed-medium-r-semicondensed--12-110-75-75-c-60-iso10646-1";
    xcb_open_font(xcb_connection,
                  xcb_font,
                  strlen(fontname),
                  fontname);

    xcb_list_fonts_with_info_cookie_t cookie;
    cookie = xcb_list_fonts_with_info(xcb_connection,
                                      1,
                                      strlen(fontname),
                                      fontname);
    xcb_list_fonts_with_info_reply_t *reply;
    reply = xcb_list_fonts_with_info_reply(xcb_connection,
                                           cookie,
                                           NULL);
    font_height = reply->font_ascent + reply->font_descent;
    printf("Calculated Font-height: %d\n", font_height);


    /* FIXME: Maybe we can push that further backwards */
    get_atoms();
}

void clean_xcb() {
    xcb_disconnect(xcb_connection);
}

void get_atoms() {
    xcb_intern_atom_reply_t *reply;
    #define ATOM_DO(name) reply = xcb_intern_atom_reply(xcb_connection, atom_cookies[name], NULL); \
        atoms[name] = reply->atom; \
        free(reply);

    #include "xcb_atoms.def"
    printf("Got Atoms\n");
}

void destroy_windows() {
    i3_output *walk;
    if (outputs == NULL) {
        return;
    }
    SLIST_FOREACH(walk, outputs, slist) {
        if (walk->bar == XCB_NONE) {
            continue;
        }
        xcb_destroy_window(xcb_connection, walk->bar);
        walk->bar = XCB_NONE;
    }
}

void create_windows() {
    uint32_t mask;
    uint32_t values[2];

    i3_output *walk;
    SLIST_FOREACH(walk, outputs, slist) {
        if (!walk->active) {
            continue;
        }
        printf("Creating Window for output %s\n", walk->name);

        walk->bar = xcb_generate_id(xcb_connection);
        mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
        values[0] = xcb_screens->black_pixel;
        values[1] = XCB_EVENT_MASK_EXPOSURE |
                    XCB_EVENT_MASK_BUTTON_PRESS;
        xcb_create_window(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);

        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]);

        walk->bargc = xcb_generate_id(xcb_connection);
        mask = XCB_GC_FONT;
        values[0] = xcb_font;
        xcb_create_gc(xcb_connection,
                      walk->bargc,
                      walk->bar,
                      mask,
                      values);

        xcb_map_window(xcb_connection, walk->bar);
    }
    xcb_flush(xcb_connection);
}

void draw_buttons() {
    printf("Drawing Buttons...\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) {
            create_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);
        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");
            }
            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_8(xcb_connection,
                             strlen(ws_walk->name),
                             outputs_walk->bar,
                             outputs_walk->bargc,
                             i + 5, font_height + 1,
                             ws_walk->name);
            i += 10 + ws_walk->name_width;
        }
        i = 0;
    }
    xcb_flush(xcb_connection);
}