1 /* See LICENSE file for copyright and license details.
3 * dynamic window manager is designed like any other X client as well. It is
4 * driven through handling X events. In contrast to other X clients, a window
5 * manager selects for SubstructureRedirectMask on the root window, to receive
6 * events about window (dis-)appearance. Only one X connection at a time is
7 * allowed to select for this event mask.
9 * Calls to fetch an X event from the event queue are blocking. Due reading
10 * status text from standard input, a select()-driven main loop has been
11 * implemented which selects for reads on the X connection and STDIN_FILENO to
12 * handle all data smoothly. The event handlers of dwm are organized in an
13 * array which is accessed whenever a new event has been fetched. This allows
14 * event dispatching in O(1) time.
16 * Each child of the root window is called a client, except windows which have
17 * set the override_redirect flag. Clients are organized in a global
18 * doubly-linked client list, the focus history is remembered through a global
19 * stack list. Each client contains an array of Bools of the same size as the
20 * global tags array to indicate the tags of a client. For each client dwm
21 * creates a small title window, which is resized whenever the (_NET_)WM_NAME
22 * properties are updated or the client is moved/resized.
24 * Keys and tagging rules are organized as arrays and defined in the config.h
25 * file. These arrays are kept static in event.o and tag.o respectively,
26 * because no other part of dwm needs access to them. The current layout is
27 * represented by the lt pointer.
29 * To understand everything else, start reading main.c:main().
35 /* mask shorthands, used in event.c and client.c */
36 #define BUTTONMASK (ButtonPressMask | ButtonReleaseMask)
38 enum { BarTop, BarBot, BarOff }; /* bar position */
39 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
40 enum { ColBorder, ColFG, ColBG, ColLast }; /* color */
41 enum { NetSupported, NetWMName, NetLast }; /* EWMH atoms */
42 enum { WMProtocols, WMDelete, WMName, WMState, WMLast };/* default atoms */
44 typedef struct Client Client;
48 int rx, ry, rw, rh; /* revert geometry */
49 int basew, baseh, incw, inch, maxw, maxh, minw, minh;
50 int minax, maxax, minay, maxay;
52 unsigned int border, oldborder;
53 Bool isbanned, isfixed, ismax, isfloating;
63 unsigned long norm[ColLast];
64 unsigned long sel[ColLast];
74 } DC; /* draw context */
76 extern const char *tags[]; /* all tags */
77 extern char stext[256]; /* status text */
78 extern int screen, sx, sy, sw, sh; /* screen geometry */
79 extern int wax, way, wah, waw; /* windowarea geometry */
80 extern unsigned int bh, blw, bpos; /* bar height, bar layout label width, bar position */
81 extern unsigned int ntags, numlockmask; /* number of tags, numlock mask */
82 extern void (*handler[LASTEvent])(XEvent *); /* event handler */
83 extern Atom wmatom[WMLast], netatom[NetLast];
84 extern Bool selscreen, *seltags; /* seltags is array of Bool */
85 extern Client *clients, *sel, *stack; /* global client list and stack */
86 extern Cursor cursor[CurLast];
87 extern DC dc; /* global draw context */
89 extern Window root, barwin;
92 void attach(Client *c); /* attaches c to global client list */
93 void ban(Client *c); /* bans c */
94 void configure(Client *c); /* send synthetic configure event */
95 void detach(Client *c); /* detaches c from global client list */
96 void focus(Client *c); /* focus c if visible && !NULL, or focus top visible */
97 void killclient(const char *arg); /* kill sel nicely */
98 void manage(Window w, XWindowAttributes *wa); /* manage new client */
99 void resize(Client *c, int x, int y,
100 int w, int h, Bool sizehints); /* resize with given coordinates c*/
101 void unban(Client *c); /* unbans c */
102 void unmanage(Client *c); /* unmanage c */
103 void updatesizehints(Client *c); /* update the size hint variables of c */
104 void updatetitle(Client *c); /* update the name of c */
107 void drawstatus(void); /* draw the bar */
108 void drawtext(const char *text, unsigned long col[ColLast]); /* draw text */
109 unsigned int textw(const char *text); /* return the width of text in px*/
112 void grabkeys(void); /* grab all keys defined in config.h */
115 Bool gettextprop(Window w, Atom atom,
116 char *text, unsigned int size); /* return text property, UTF-8 compliant */
117 void quit(const char *arg); /* quit dwm nicely */
118 int xerror(Display *dsply, XErrorEvent *ee); /* dwm's X error handler */
121 void applyrules(Client *c); /* applies rules to c */
122 void arrange(void); /* arranges all windows depending on the layout in use */
123 void compileregs(void); /* initialize regexps of rules defined in config.h */
124 void focusnext(const char *arg); /* focuses next visible client */
125 void focusprev(const char *arg); /* focuses prev visible client */
126 const char *getsymbol(void); /* returns symbol of enabled layout */
127 void initlayouts(void); /* initialize layout array */
128 Bool isarrange(void (*func)()); /* returns True if func is the layout function in use */
129 Bool isfloating(void); /* returns True if floating layout is enabled */
130 Bool isvisible(Client *c); /* returns True if client is visible */
131 Client *nexttiled(Client *c); /* returns tiled successor of c */
132 void restack(void); /* restores z layers of all clients */
133 void setlayout(const char *arg); /* sets layout, NULL means next layout */
134 void tag(const char *arg); /* tags sel with arg's index */
135 void togglebar(const char *arg); /* shows/hides the bar */
136 void togglefloating(const char *arg); /* toggles sel between floating/tiled state */
137 void togglemax(const char *arg); /* toggles maximization of floating client */
138 void toggletag(const char *arg); /* toggles sel tags with arg's index */
139 void toggleview(const char *arg); /* toggles the tag with arg's index (in)visible */
140 void updatebarpos(void); /* updates the bar position */
141 void view(const char *arg); /* views the tag with arg's index */
144 void *emallocz(unsigned int size); /* allocates zero-initialized memory, exits on error */
145 void eprint(const char *errstr, ...); /* prints errstr and exits with 1 */
146 void spawn(const char *arg); /* forks a new subprocess with arg's cmd */