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