commit a9a5c6cc2d7d55ed7e556a4fe9d75307c6df2e84
Author:     Quentin Rameau <quinq@fifth.space>
AuthorDate: Sat Oct 8 14:08:28 2016 +0200
Commit:     Hiltjo Posthuma <hil...@codemadness.org>
CommitDate: Fri Oct 14 15:26:35 2016 +0200

    add embedding support with -w option

diff --git a/dmenu.1 b/dmenu.1
index 8bbd79d..9eab758 100644
--- a/dmenu.1
+++ b/dmenu.1
@@ -20,6 +20,8 @@ dmenu \- dynamic menu
 .IR color ]
 .RB [ \-sf
 .IR color ]
+.RB [ \-w
+.IR windowid ]
 .P
 .BR dmenu_run " ..."
 .SH DESCRIPTION
@@ -75,6 +77,9 @@ defines the selected foreground color.
 .TP
 .B \-v
 prints version information to stdout, then exits.
+.TP
+.BI \-w " windowid"
+embed into windowid.
 .SH USAGE
 dmenu is completely controlled by the keyboard.  Items are selected using the
 arrow keys, page up, page down, home, and end.
diff --git a/dmenu.c b/dmenu.c
index ff74369..9278e91 100644
--- a/dmenu.c
+++ b/dmenu.c
@@ -34,8 +34,8 @@ struct item {
 };
 
 static char text[BUFSIZ] = "";
+static char *embed;
 static int bh, mw, mh;
-static int sw, sh; /* X display screen geometry width, height */
 static int inputw = 0, promptw;
 static int lrpad; /* sum of left and right padding */
 static size_t cursor;
@@ -46,7 +46,7 @@ static int mon = -1, screen;
 
 static Atom clip, utf8;
 static Display *dpy;
-static Window root, win;
+static Window root, parentwin, win;
 static XIC xic;
 
 static Drw *drw;
@@ -175,11 +175,30 @@ drawmenu(void)
 }
 
 static void
+grabfocus(void)
+{
+       struct timespec ts = { .tv_sec = 0, .tv_nsec = 10000000  };
+       Window focuswin;
+       int i, revertwin;
+
+       for (i = 0; i < 100; ++i) {
+               XGetInputFocus(dpy, &focuswin, &revertwin);
+               if (focuswin == win)
+                       return;
+               XSetInputFocus(dpy, win, RevertToParent, CurrentTime);
+               nanosleep(&ts, NULL);
+       }
+       die("cannot grab focus");
+}
+
+static void
 grabkeyboard(void)
 {
        struct timespec ts = { .tv_sec = 0, .tv_nsec = 1000000  };
        int i;
 
+       if (embed)
+               return;
        /* try to grab keyboard, we may have to wait for another process to 
ungrab */
        for (i = 0; i < 1000; i++) {
                if (XGrabKeyboard(dpy, DefaultRootWindow(dpy), True, 
GrabModeAsync,
@@ -497,6 +516,11 @@ run(void)
                        if (ev.xexpose.count == 0)
                                drw_map(drw, win, 0, 0, mw, mh);
                        break;
+               case FocusIn:
+                       /* regrab focus from parent window */
+                       if (ev.xfocus.window != win)
+                               grabfocus();
+                       break;
                case KeyPress:
                        keypress(&ev.xkey);
                        break;
@@ -539,7 +563,7 @@ setup(void)
        lines = MAX(lines, 0);
        mh = (lines + 1) * bh;
 #ifdef XINERAMA
-       if ((info = XineramaQueryScreens(dpy, &n))) {
+       if (parentwin == root && (info = XineramaQueryScreens(dpy, &n))) {
                XGetInputFocus(dpy, &w, &di);
                if (mon >= 0 && mon < n)
                        i = mon;
@@ -570,9 +594,12 @@ setup(void)
        } else
 #endif
        {
+               if (!XGetWindowAttributes(dpy, parentwin, &wa))
+                       die("could not get embedding window attributes: 0x%lx",
+                           parentwin);
                x = 0;
-               y = topbar ? 0 : sh - mh;
-               mw = sw;
+               y = topbar ? 0 : wa.height - mh;
+               mw = wa.width;
        }
        promptw = (prompt && *prompt) ? TEXTW(prompt) - lrpad / 4 : 0;
        inputw = MIN(inputw, mw/3);
@@ -582,9 +609,8 @@ setup(void)
        swa.override_redirect = True;
        swa.background_pixel = scheme[SchemeNorm][ColBg].pixel;
        swa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
-       win = XCreateWindow(dpy, root, x, y, mw, mh, 0,
-                           DefaultDepth(dpy, screen), CopyFromParent,
-                           DefaultVisual(dpy, screen),
+       win = XCreateWindow(dpy, parentwin, x, y, mw, mh, 0,
+                           CopyFromParent, CopyFromParent, CopyFromParent,
                            CWOverrideRedirect | CWBackPixel | CWEventMask, 
&swa);
 
        /* open input methods */
@@ -593,6 +619,15 @@ setup(void)
                        XNClientWindow, win, XNFocusWindow, win, NULL);
 
        XMapRaised(dpy, win);
+       if (embed) {
+               XSelectInput(dpy, parentwin, FocusChangeMask);
+               if (XQueryTree(dpy, parentwin, &dw, &w, &dws, &du) && dws) {
+                       for (i = 0; i < du && dws[i] != win; ++i)
+                               XSelectInput(dpy, dws[i], FocusChangeMask);
+                       XFree(dws);
+               }
+               grabfocus();
+       }
        drw_resize(drw, mw, mh);
        drawmenu();
 }
@@ -601,13 +636,14 @@ static void
 usage(void)
 {
        fputs("usage: dmenu [-bfiv] [-l lines] [-p prompt] [-fn font] [-m 
monitor]\n"
-             "             [-nb color] [-nf color] [-sb color] [-sf color]\n", 
stderr);
+             "             [-nb color] [-nf color] [-sb color] [-sf color] [-w 
windowid]\n", stderr);
        exit(1);
 }
 
 int
 main(int argc, char *argv[])
 {
+       XWindowAttributes wa;
        int i, fast = 0;
 
        for (i = 1; i < argc; i++)
@@ -641,6 +677,8 @@ main(int argc, char *argv[])
                        colors[SchemeSel][ColBg] = argv[++i];
                else if (!strcmp(argv[i], "-sf"))  /* selected foreground color 
*/
                        colors[SchemeSel][ColFg] = argv[++i];
+               else if (!strcmp(argv[i], "-w"))   /* embedding window id */
+                       embed = argv[++i];
                else
                        usage();
 
@@ -650,9 +688,12 @@ main(int argc, char *argv[])
                die("cannot open display");
        screen = DefaultScreen(dpy);
        root = RootWindow(dpy, screen);
-       sw = DisplayWidth(dpy, screen);
-       sh = DisplayHeight(dpy, screen);
-       drw = drw_create(dpy, screen, root, sw, sh);
+       if (!embed || !(parentwin = strtol(embed, NULL, 0)))
+               parentwin = root;
+       if (!XGetWindowAttributes(dpy, parentwin, &wa))
+               die("could not get embedding window attributes: 0x%lx",
+                   parentwin);
+       drw = drw_create(dpy, screen, root, wa.width, wa.height);
        if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
                die("no fonts could be loaded.");
        lrpad = drw->fonts->h;

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