dwm.h

   1 /*
   2  * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
   3  * See LICENSE file for license details.
   4  *
   5  * dynamic window manager is designed like any other X client as well. It is
   6  * driven through handling X events. In contrast to other X clients, a window
   7  * manager like dwm selects for SubstructureRedirectMask on the root window, to
   8  * receive events about child window appearance and disappearance.  Only one X
   9  * connection at a time is allowed to select for this event mask.
  10  *
  11  * Calls to fetch an X event from the event queue of the X connection are
  12  * blocking.  Due the fact, that dwm reads status text from standard input, a
  13  * select-driven main loop has been implemented which selects for reads on the
  14  * X connection and STDIN_FILENO to handle all data smoothly and without
  15  * busy-loop quirks. The event handlers of dwm are organized in an array which
  16  * is accessed whenever a new event has been fetched. This allows event
  17  * dispatching in O(1) time.
  18  *
  19  * Each child window of the root window is called a client in window manager
  20  * terminology, except windows which have set the override_redirect flag.
  21  * Clients are organized in a global doubly-linked client list, the focus
  22  * history is remembered through a global stack list. Each client contains an
  23  * array of Bools of the same size as the global tags array to indicate the
  24  * tags of a client. There are no other data structures to organize the clients
  25  * in tag lists. All clients which have at least one tag enabled of the current
  26  * tags viewed, will be visible on the screen, all other clients are banned to
  27  * the x-location x + 2 * screen width.  This avoids having additional layers
  28  * of workspace handling.
  29  *
  30  * For each client dwm creates a small title window which is resized whenever
  31  * the WM_NAME or _NET_WM_NAME properties are updated or the client is resized.
  32  * Keys and tagging rules are organized as arrays and defined in the config.h
  33  * file. These arrays are kept static in event.o and tag.o respectively,
  34  * because no other part of dwm needs access to them.  The current mode is
  35  * represented by the arrange function pointer which wether points to dofloat
  36  * or dotile.
  37  *
  38  * To understand everything else, start with reading main.c:main().
  39  */
  40
  41 #include "config.h"
  42 #include <X11/Xlib.h>
  43
  44 /* mask shorthands, used in event.c and client.c */
  45 #define BUTTONMASK              (ButtonPressMask | ButtonReleaseMask)
  46 #define MOUSEMASK               (BUTTONMASK | PointerMotionMask)
  47 #define PROTODELWIN             1
  48
  49 enum { NetSupported, NetWMName, NetLast };              /* EWMH atoms */
  50 enum { WMProtocols, WMDelete, WMLast };                 /* default atoms */
  51 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  52 enum { ColFG, ColBG, ColLast };                         /* color */
  53
  54 typedef enum {
  55         TopLeft, TopRight, BotLeft, BotRight
  56 } Corner; /* window corners */
  57
  58 typedef union {
  59         const char *cmd;
  60         int i;
  61 } Arg; /* argument type */
  62
  63 typedef struct {
  64         int ascent;
  65         int descent;
  66         int height;
  67         XFontSet set;
  68         XFontStruct *xfont;
  69 } Fnt;
  70
  71 typedef struct {
  72         int x, y, w, h;
  73         unsigned long norm[ColLast];
  74         unsigned long sel[ColLast];
  75         unsigned long status[ColLast];
  76         Drawable drawable;
  77         Fnt font;
  78         GC gc;
  79 } DC; /* draw context */
  80
  81 typedef struct Client Client;
  82 struct Client {
  83         char name[256];
  84         int proto;
  85         int x, y, w, h;
  86         int tx, ty, tw, th; /* title window geometry */
  87         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  88         int grav;
  89         long flags;
  90         unsigned int border, weight;
  91         Bool isfloat;
  92         Bool *tags;
  93         Client *next;
  94         Client *prev;
  95         Client *snext;
  96         Window win;
  97         Window twin;
  98 };
  99
 100 extern const char *tags[];                      /* all tags */
 101 extern char stext[1024];                        /* status text */
 102 extern int bx, by, bw, bh, bmw;                 /* bar geometry, bar mode label width */
 103 extern int mw, screen, sx, sy, sw, sh;          /* screen geometry, master width */
 104 extern unsigned int ntags, numlockmask;         /* number of tags, dynamic lock mask */
 105 extern void (*handler[LASTEvent])(XEvent *);    /* event handler */
 106 extern void (*arrange)(Arg *);                  /* arrange function, indicates mode  */
 107 extern Atom wmatom[WMLast], netatom[NetLast];
 108 extern Bool running, issel, maximized, *seltag; /* seltag is array of Bool */
 109 extern Client *clients, *sel, *stack;           /* global cleint list and stack */
 110 extern Cursor cursor[CurLast];
 111 extern DC dc;                                   /* global draw context */
 112 extern Display *dpy;
 113 extern Window root, barwin;
 114
 115 /* client.c */
 116 extern void ban(Client *c);                     /* ban c from screen */
 117 extern void focus(Client *c);                   /* focus c, c may be NULL */
 118 extern Client *getclient(Window w);             /* return client of w */
 119 extern Client *getctitle(Window w);             /* return client of title window */
 120 extern void gravitate(Client *c, Bool invert);  /* gravitate c */
 121 extern void killclient(Arg *arg);               /* kill c nicely */
 122 extern void manage(Window w, XWindowAttributes *wa);    /* manage new client */
 123 extern void resize(Client *c, Bool sizehints, Corner sticky); /* resize c*/
 124 extern void updatesize(Client *c);                      /* update the size structs of c */
 125 extern void updatetitle(Client *c);             /* update the name of c */
 126 extern void togglemax(Arg *arg);                /* (un)maximize c */
 127 extern void unmanage(Client *c);                /* destroy c */
 128
 129 /* draw.c */
 130 extern void drawall();                          /* draw all visible client titles and the bar */
 131 extern void drawstatus();                       /* draw the bar */
 132 extern void drawtitle(Client *c);               /* draw title of c */
 133 extern unsigned long getcolor(const char *colstr);      /* return color of colstr */
 134 extern void setfont(const char *fontstr);       /* set the font for DC */
 135 extern unsigned int textw(const char *text);    /* return the width of text in px*/
 136
 137 /* event.c */
 138 extern void grabkeys();                         /* grab all keys defined in config.h */
 139 extern void procevent();                        /* process pending X events */
 140
 141 /* main.c */
 142 extern int getproto(Window w);                  /* return protocol mask of WMProtocols property of w */
 143 extern void quit(Arg *arg);                     /* quit dwm nicely */
 144 extern void sendevent(Window w, Atom a, long value);    /* send synthetic event to w */
 145 extern int xerror(Display *dsply, XErrorEvent *ee);     /* dwm's X error handler */
 146
 147 /* tag.c */
 148 extern void initrregs();                        /* initialize regexps of rules defined in config.h */
 149 extern Client *getnext(Client *c);              /* returns next visible client */
 150 extern Client *getprev(Client *c);              /* returns previous visible client */
 151 extern void settags(Client *c, Client *trans);  /* sets tags of c */
 152 extern void tag(Arg *arg);                      /* tags c with arg's index */
 153 extern void toggletag(Arg *arg);                /* toggles c tags with arg's index */
 154
 155 /* util.c */
 156 extern void *emallocz(unsigned int size);       /* allocates zero-initialized memory, exits on error */
 157 extern void eprint(const char *errstr, ...);    /* prints errstr and exits with 1 */
 158 extern void *erealloc(void *ptr, unsigned int size);    /* reallocates memory, exits on error */
 159 extern void spawn(Arg *arg);                    /* forks a new subprocess with to arg's cmd */
 160
 161 /* view.c */
 162 extern void detach(Client *c);                  /* detaches c from global client list */
 163 extern void dofloat(Arg *arg);                  /* arranges all windows floating, arg is ignored */
 164 extern void dotile(Arg *arg);                   /* arranges all windows, arg is ignored */
 165 extern void focusnext(Arg *arg);                /* focuses next visible client, arg is ignored  */
 166 extern void focusprev(Arg *arg);                /* focuses previous visible client, arg is ignored */
 167 extern Bool isvisible(Client *c);               /* returns True if client is visible */
 168 extern void resizecol(Arg *arg);                /* resizes the master width with arg's index value */
 169 extern void restack();                          /* restores z layers of all clients */
 170 extern void togglemode(Arg *arg);               /* toggles global arrange function (dotile/dofloat) */
 171 extern void toggleview(Arg *arg);               /* toggles the tag with arg's index (in)visible */
 172 extern void view(Arg *arg);                     /* views the tag with arg's index */
 173 extern void viewall(Arg *arg);                  /* views all tags, arg is ignored */
 174 extern void zoom(Arg *arg);                     /* zooms the focused client to master column, arg is ignored */