[dev] [dwm] Popup bar patch

[Thomas Spurden]

I have written a little patch which will pop up the bar (if it is
hidden) whilst a key is held down, over the top of all the windows.  It
allows you to "peek" at the window title/status/tags without actually
unhiding the bar.

I have it set to pop up when Super_L or Super_R is held down, as these
are the modifier keys which all my key bindings use.  I didn't bother
adding a config.h option for which key(s) pop up the bar, but it could
easily be done.

The patch is against hg tip (as of a few days ago anyway).

-- 
Thomas Spurden

diff -r 0d86faf4b05c dwm.c
--- a/dwm.c     Sun Jul 25 09:58:25 2010 +0100
+++ b/dwm.c     Wed Aug 18 20:13:38 2010 +0100
@@ -133,6 +133,7 @@
        unsigned int sellt;
        unsigned int tagset[2];
        Bool showbar;
+       Bool popupbar;
        Bool topbar;
        Client *clients;
        Client *sel;
@@ -221,6 +222,7 @@
 static int textnw(const char *text, unsigned int len);
 static void tile(Monitor *);
 static void togglebar(const Arg *arg);
+static void popupbar(Bool show);
 static void togglefloating(const Arg *arg);
 static void toggletag(const Arg *arg);
 static void toggleview(const Arg *arg);
@@ -261,6 +263,7 @@
        [Expose] = expose,
        [FocusIn] = focusin,
        [KeyPress] = keypress,
+       [KeyRelease] = keypress,
        [MappingNotify] = mappingnotify,
        [MapRequest] = maprequest,
        [PropertyNotify] = propertynotify,
@@ -978,6 +981,12 @@
                KeyCode code;
 
                XUngrabKey(dpy, AnyKey, AnyModifier, root);
+
+               XGrabKey(dpy, XKeysymToKeycode(dpy, XK_Super_L), AnyModifier, 
root,
+                               True, GrabModeAsync, GrabModeAsync);
+               XGrabKey(dpy, XKeysymToKeycode(dpy, XK_Super_R), AnyModifier, 
root,
+                               True, GrabModeAsync, GrabModeAsync);
+
                for(i = 0; i < LENGTH(keys); i++) {
                        if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
                                for(j = 0; j < LENGTH(modifiers); j++)
@@ -1059,11 +1068,21 @@
 
        ev = &e->xkey;
        keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
+       if(keysym == XK_Super_L || keysym == XK_Super_R) {
+               popupbar(ev->type == KeyPress);
+               return;
+       }
+       if(ev->type == KeyRelease) {
+               return;
+       }
+
        for(i = 0; i < LENGTH(keys); i++)
                if(keysym == keys[i].keysym
                && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
                && keys[i].func)
                        keys[i].func(&(keys[i].arg));
+
+       popupbar(selmon->popupbar);
 }
 
 void
@@ -1673,6 +1692,24 @@
 }
 
 void
+popupbar(Bool show) {
+       if(selmon->showbar) return;
+
+       if(show != selmon->popupbar) {
+               selmon->popupbar = show;
+               if(show) {
+                       selmon->by = selmon->topbar ? selmon->wy : selmon->wy + 
selmon->wh;
+               }
+               else {
+                       selmon->by = -bh;
+               }
+               XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, 
selmon->ww, bh);
+       }
+
+       if(show) XRaiseWindow(dpy, selmon->barwin);
+}
+
+void
 togglefloating(const Arg *arg) {
        if(!selmon->sel)
                return;

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