1 /* (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>
2 * See LICENSE file for license details.
4 * dynamic window manager is designed like any other X client as well. It is
5 * driven through handling X events. In contrast to other X clients, a window
6 * manager selects for SubstructureRedirectMask on the root window, to receive
7 * events about window (dis-)appearance. Only one X connection at a time is
8 * allowed to select for this event mask.
10 * Calls to fetch an X event from the event queue are blocking. Due reading
11 * status text from standard input, a select()-driven main loop has been
12 * implemented which selects for reads on the X connection and STDIN_FILENO to
13 * handle all data smoothly. The event handlers of dwm are organized in an
14 * array which is accessed whenever a new event has been fetched. This allows
15 * event dispatching in O(1) time.
17 * Each child of the root window is called a client, except windows which have
18 * set the override_redirect flag. Clients are organized in a global
19 * doubly-linked client list, the focus history is remembered through a global
20 * stack list. Each client contains an array of Bools of the same size as the
21 * global tags array to indicate the tags of a client. For each client dwm
22 * creates a small title window, which is resized whenever the (_NET_)WM_NAME
23 * properties are updated or the client is moved/resized.
25 * Keys and tagging rules are organized as arrays and defined in the config.h
26 * file. These arrays are kept static in event.o and tag.o respectively,
27 * because no other part of dwm needs access to them. The current layout is
28 * represented by the lt pointer.
30 * To understand everything else, start reading main.c:main().
36 /* mask shorthands, used in event.c and client.c */
37 #define BUTTONMASK (ButtonPressMask | ButtonReleaseMask)
39 enum { NetSupported, NetWMName, NetLast }; /* EWMH atoms */
40 enum { WMProtocols, WMDelete, WMState, WMLast }; /* default atoms */
41 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
42 enum { ColBorder, ColFG, ColBG, ColLast }; /* color */
47 } Arg; /* argument type */
59 unsigned long norm[ColLast];
60 unsigned long sel[ColLast];
64 } DC; /* draw context */
66 typedef struct Client Client;
70 int rx, ry, rw, rh; /* revert geometry */
71 int basew, baseh, incw, inch, maxw, maxh, minw, minh;
72 int minax, minay, maxax, maxay;
75 Bool isbanned, isfixed, ismax, swimming;
85 void (*arrange)(void);
88 extern const char *tags[]; /* all tags */
89 extern char stext[256]; /* status text */
90 extern int screen, sx, sy, sw, sh; /* screen geometry */
91 extern int wax, way, wah, waw; /* windowarea geometry */
92 extern unsigned int bh, blw; /* bar height, bar layout label width */
93 extern unsigned int master, nmaster; /* master percent, number of master clients */
94 extern unsigned int ntags, numlockmask; /* number of tags, dynamic lock mask */
95 extern void (*handler[LASTEvent])(XEvent *); /* event handler */
96 extern Atom wmatom[WMLast], netatom[NetLast];
97 extern Bool running, selscreen, *seltag; /* seltag is array of Bool */
98 extern Client *clients, *sel, *stack; /* global client list and stack */
99 extern Cursor cursor[CurLast];
100 extern DC dc; /* global draw context */
103 extern Window root, barwin;
106 extern void configure(Client *c); /* send synthetic configure event */
107 extern void focus(Client *c); /* focus c, c may be NULL */
108 extern void focusnext(Arg *arg); /* focuses next visible client, arg is ignored */
109 extern void focusprev(Arg *arg); /* focuses previous visible client, arg is ignored */
110 extern void killclient(Arg *arg); /* kill c nicely */
111 extern void manage(Window w, XWindowAttributes *wa); /* manage new client */
112 extern Client *nexttiled(Client *c); /* returns tiled successor of c */
113 extern void resize(Client *c, int x, int y,
114 int w, int h, Bool sizehints); /* resize with given coordinates c*/
115 extern void updatesizehints(Client *c); /* update the size hint variables of c */
116 extern void updatetitle(Client *c); /* update the name of c */
117 extern void unmanage(Client *c); /* destroy c */
118 extern void zoom(Arg *arg); /* zooms the focused client to master area, arg is ignored */
121 extern void grabkeys(void); /* grab all keys defined in config.h */
124 extern void drawstatus(void); /* draw the bar */
125 extern unsigned int textw(const char *text); /* return the width of text in px*/
126 extern void quit(Arg *arg); /* quit dwm nicely */
127 extern void sendevent(Window w, Atom a, long value); /* send synthetic event to w */
128 extern int xerror(Display *dsply, XErrorEvent *ee); /* dwm's X error handler */
131 extern void compileregs(void); /* initialize regexps of rules defined in config.h */
132 extern void incnmaster(Arg *arg); /* increments nmaster with arg's index value */
133 extern void initlayouts(void); /* initialize layout array */
134 extern Bool isvisible(Client *c); /* returns True if client is visible */
135 extern void resizemaster(Arg *arg); /* resizes the master percent with arg's index value */
136 extern void restack(void); /* restores z layers of all clients */
137 extern void settags(Client *c, Client *trans); /* sets tags of c */
138 extern void swim(void); /* arranges all windows swimming */
139 extern void tag(Arg *arg); /* tags c with arg's index */
140 extern void toggleswimming(Arg *arg); /* toggles focusesd client between swimming/and non-swimming state */
141 extern void togglelayout(Arg *arg); /* toggles layout */
142 extern void toggletag(Arg *arg); /* toggles c tags with arg's index */
143 extern void toggleview(Arg *arg); /* toggles the tag with arg's index (in)visible */
144 extern void view(Arg *arg); /* views the tag with arg's index */
147 extern void *emallocz(unsigned int size); /* allocates zero-initialized memory, exits on error */
148 extern void eprint(const char *errstr, ...); /* prints errstr and exits with 1 */
149 extern void spawn(Arg *arg); /* forks a new subprocess with to arg's cmd */