X11: 入力メソッド (2) - XIC

$ cc -o run 23-im2.c util.c -lX11

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

void _put_text(XKeyEvent *ev,XIC ic)
{
    char m[64],*buf;
    KeySym keysym;
    Status ret;
    int len;

    buf = m;

    len = XmbLookupString(ic, ev, m, 63, &keysym, &ret);

    //バッファ長さが足りない

    if(ret == XBufferOverflow)
    {
        buf = (char *)malloc(len + 1);
        if(!buf) return;

        len = XmbLookupString(ic, ev, buf, len, &keysym, &ret);
    }

    //表示

    buf[len] = 0;

    if(ret == XLookupBoth || ret == XLookupKeySym)
        printf("# KeySym: %lu\n", keysym);

    if(ret == XLookupBoth || ret == XLookupChars)
    {
        if(len == 1 && !(buf[0] >= 0x20 && buf[0] < 0x7f))
            //ASCII 制御文字
            printf("# <%d>\n", buf[0]);
        else
            printf("# '%s'\n", buf);
    }

    if(buf != m) free(buf);
}

int main(int argc,char **argv)
{
    Display *disp;
    XSetWindowAttributes attr;
    Window win;
    XEvent ev;
    XIM im = None;
    XIC ic = None;
    XIMStyle style;
    unsigned long mask;
    
    disp = XOpenDisplay(NULL);
    if(!disp) return 1;

    init_locale();

    //IM 開く

    im = XOpenIM(disp, NULL, NULL, NULL);
    if(!im)
    {
        printf("failed XOpenIM\n");
        goto END;
    }

    style = get_xim_style_nothing(im);
    if(!style)
    {
        printf("unsupported IM style\n");
        goto END;
    }

    //ウィンドウ作成

    attr.background_pixel = 0;
    attr.event_mask = ButtonPressMask | FocusChangeMask
        | KeyPressMask | KeyReleaseMask;

    win = XCreateWindow(disp, DefaultRootWindow(disp),
        0, 0, 200, 200, 0,
        CopyFromParent, CopyFromParent, CopyFromParent,
        CWBackPixel | CWEventMask, &attr);

    printf("window: 0x%lx\n", win);

    //IC 作成

    ic = XCreateIC(im,
        XNInputStyle, style,
        XNClientWindow, win,
        XNFocusWindow, win,
        (void *)0);

    if(!ic) goto END;

    //イベントマスク

    mask = 0;
    XGetICValues(ic, XNFilterEvents, &mask, (void *)0);

    printf("event mask: 0x%lx\n", mask);

    XSelectInput(disp, win, mask | attr.event_mask);

    //イベント

    XMapWindow(disp, win);

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

        if(XFilterEvent(&ev, None))
        {
            printf("-[filter] window(0x%lx) ", ev.xany.window);

            switch(ev.type)
            {
                case KeyPress:
                    printf("<KeyPress> keycode(%d)\n",
                        ev.xkey.keycode);
                    break;
                case KeyRelease:
                    printf("<KeyRelease> keycode(%d)\n",
                        ev.xkey.keycode);
                    break;
                case ClientMessage:
                    printf("<ClientMessage>\n");
                    break;
                default:
                    printf("<%d>\n", ev.type);
                    break;
            }
            continue;
        }

        switch(ev.type)
        {
            case KeyPress:
                printf("[KeyPress] keycode(%d)\n", ev.xkey.keycode);
                _put_text((XKeyEvent *)&ev, ic);
                break;
            case KeyRelease:
                printf("[KeyRelease] keycode(%d)\n", ev.xkey.keycode);
            case FocusIn:
                XSetICFocus(ic);
                printf("[FocusIn] window(0x%lx) mode(%d)\n",
                    ev.xfocus.window, ev.xfocus.mode);
                break;
            case FocusOut:
                XUnsetICFocus(ic);
                printf("[FocusOut] window(0x%lx) mode(%d)\n",
                    ev.xfocus.window, ev.xfocus.mode);
                break;
            case ButtonPress:
                goto END;
        }
    }

    //
END:
    if(ic) XDestroyIC(ic);
    if(im) XCloseIM(im);

    XCloseDisplay(disp);

    return 0;
}