dwm.h

   1 /* (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>
   2  * See LICENSE file for license details.
   3  *
   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.
   9  *
  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.
  16  *
  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.
  24  *
  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.
  29  *
  30  * To understand everything else, start reading main.c:main().
  31  */
  32
  33 #include "config.h"
  34 #include <X11/Xlib.h>
  35
  36 /* mask shorthands, used in event.c and client.c */
  37 #define BUTTONMASK              (ButtonPressMask | ButtonReleaseMask)
  38
  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 */
  43
  44 typedef union {
  45         const char *cmd;
  46         int i;
  47 } Arg; /* argument type */
  48
  49 typedef struct {
  50         int ascent;
  51         int descent;
  52         int height;
  53         XFontSet set;
  54         XFontStruct *xfont;
  55 } Fnt;
  56
  57 typedef struct {
  58         int x, y, w, h;
  59         unsigned long norm[ColLast];
  60         unsigned long sel[ColLast];
  61         Drawable drawable;
  62         Fnt font;
  63         GC gc;
  64 } DC; /* draw context */
  65
  66 typedef struct Client Client;
  67 struct Client {
  68         char name[256];
  69         int x, y, w, h;
  70         int rx, ry, rw, rh; /* revert geometry */
  71         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  72         int minax, minay, maxax, maxay;
  73         long flags;
  74         unsigned int border;
  75         Bool isbanned, isfixed, ismax, isversatile;
  76         Bool *tags;
  77         Client *next;
  78         Client *prev;
  79         Client *snext;
  80         Window win;
  81 };
  82
  83 typedef struct {
  84         const char *symbol;
  85         void (*arrange)(void);
  86 } Layout;
  87
  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 */
 101 extern Display *dpy;
 102 extern Layout *lt;
 103 extern Window root, barwin;
 104
 105 /* client.c */
 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 */
 119
 120 /* event.c */
 121 extern void grabkeys(void);                     /* grab all keys defined in config.h */
 122
 123 /* main.c */
 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 */
 129
 130 /* screen.c */
 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 tag(Arg *arg);                      /* tags c with arg's index */
 139 extern void toggleversatile(Arg *arg);          /* toggles focusesd client between versatile/and non-versatile state */
 140 extern void togglelayout(Arg *arg);             /* toggles layout */
 141 extern void toggletag(Arg *arg);                /* toggles c tags with arg's index */
 142 extern void toggleview(Arg *arg);               /* toggles the tag with arg's index (in)visible */
 143 extern void versatile(void);                    /* arranges all windows versatile */
 144 extern void view(Arg *arg);                     /* views the tag with arg's index */
 145
 146 /* util.c */
 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 */
 150