X11: NetWM (5) - StartupNotify

$ cc -o run d12-startup.c util.c -lX11

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h>
#include "util.h"

/* 送る文字列の作成
 *
 * ※<"><\> が含まれていないものとして扱う。
 * ret_len: ヌル文字も含む長さ */

static char *_get_notify_string(char *notify_id,int *ret_len)
{
    char *buf;
    int len;

    len = strlen(notify_id);

    buf = (char *)malloc(len + 14);

    memcpy(buf, "remove: ID=\"", 12);
    memcpy(buf + 12, notify_id, len);
    buf[12 + len] = '"';
    buf[13 + len] = 0;

    *ret_len = len + 14;

    return buf;
}

/* 完了通知を送る */

static void _send_notify(Display *disp,char *notify_id)
{
    Window win;
    XClientMessageEvent ev;
    int len,pos,size;
    char *str;

    str = _get_notify_string(notify_id, &len);

    printf("[send] %s\n", str);

    win = XCreateWindow(disp, g_disp.root,
         0, 0, 1, 1, 0,
         CopyFromParent, InputOnly, CopyFromParent,
         0, NULL);

    //イベント

    memset(&ev, 0, sizeof(XClientMessageEvent));

    ev.type = ClientMessage;
    ev.message_type = GET_ATOM("_NET_STARTUP_INFO_BEGIN");
    ev.display = disp;
    ev.window = win;
    ev.format = 8;

    //送信

    pos = 0;

    while(len > 0)
    {
        size = (len < 20)? len: 20;
        
        memcpy(ev.data.b, str + pos, size);

        if(size < 20)
            memset(ev.data.b + size, 0, 20 - size);

        XSendEvent(disp, g_disp.root, False, PropertyChangeMask, (XEvent *)&ev);

        if(pos == 0)
            ev.message_type = GET_ATOM("_NET_STARTUP_INFO");

        pos += size;
        len -= size;
    }

    //終了

    XDestroyWindow(disp, win);
    XFlush(disp);
}

int main(int argc,char **argv)
{
    Display *disp;
    Window win[2],leader;
    XEvent ev;
    XWMHints h;
    char *notify_id;
    
    disp = XOpenDisplay(NULL);
    if(!disp) return 1;

    set_display(disp);

    //環境変数の取得

    notify_id = getenv("DESKTOP_STARTUP_ID");

    if(!notify_id)
        printf("DESKTOP_STARTUP_ID: <none>\n");
    else
    {
        notify_id = strdup(notify_id);

        printf("DESKTOP_STARTUP_ID: '%s'\n", notify_id);
    }

    unsetenv("DESKTOP_STARTUP_ID");

    //グループリーダー

    leader = XCreateWindow(disp, g_disp.root,
        0, 0, 1, 1, 0,
        CopyFromParent, InputOnly, CopyFromParent,
        0, NULL);

    if(notify_id)
    {
        XChangeProperty(disp, leader,
            GET_ATOM("_NET_STARTUP_ID"), GET_ATOM("UTF8_STRING"), 8,
            PropModeReplace, (unsigned char *)notify_id, strlen(notify_id));
    }

    //通常ウィンドウ

    win[0] = create_test_window2(disp, 200, 200, 0, StructureNotifyMask);

    win[1] = create_test_window2(disp, 200, 200,
        rgb_to_pixel(0x0000ff), StructureNotifyMask);

    //グループリーダーをセット

    h.flags = WindowGroupHint;
    h.window_group = leader;

    XSetWMHints(disp, win[0], &h);
    XSetWMHints(disp, win[1], &h);

    //イベント

    XMapWindow(disp, win[0]);
    XMapWindow(disp, win[1]);

    while(1)
    {
        XNextEvent(disp, &ev);

        if(event_quit(&ev)) break;

        switch(ev.type)
        {
            case MapNotify:
                //最初のマップ時に通知
                if(notify_id)
                {
                    _send_notify(disp, notify_id);
                    
                    free(notify_id);
                    notify_id = NULL;
                }
                break;
        }
    }

    XCloseDisplay(disp);

    if(notify_id) free(notify_id);

    return 0;
}

[Desktop Entry]
Type=Application
Name=startup_test
Exec=/path/run
Icon=terminal
Terminal=true
Categories=Graphics;
MimeType=text/plain;
StartupNotify=true

$ cp startup_test.desktop ~/.local/share/applications
$ update-desktop-database ~/.local/share/applications

$ rm ~/.local/share/applications/startup_test.desktop
$ update-desktop-database ~/.local/share/applications