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174 lines
7.6 KiB
174 lines
7.6 KiB
/*
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* (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
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* See LICENSE file for license details.
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*
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* dynamic window manager is designed like any other X client as well. It is
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* driven through handling X events. In contrast to other X clients, a window
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* manager like dwm selects for SubstructureRedirectMask on the root window, to
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* receive events about child window appearance and disappearance. Only one X
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* connection at a time is allowed to select for this event mask.
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*
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* Calls to fetch an X event from the event queue of the X connection are
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* blocking. Due the fact, that dwm reads status text from standard input, a
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* select-driven main loop has been implemented which selects for reads on the
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* X connection and STDIN_FILENO to handle all data smoothly and without
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* busy-loop quirks. The event handlers of dwm are organized in an array which
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* is accessed whenever a new event has been fetched. This allows event
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* dispatching in O(1) time.
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*
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* Each child window of the root window is called a client in window manager
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* terminology, except windows which have set the override_redirect flag.
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* Clients are organized in a global doubly-linked client list, the focus
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* history is remembered through a global stack list. Each client contains an
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* array of Bools of the same size as the global tags array to indicate the
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* tags of a client. There are no other data structures to organize the clients
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* in tag lists. All clients which have at least one tag enabled of the current
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* tags viewed, will be visible on the screen, all other clients are banned to
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* the x-location x + 2 * screen width. This avoids having additional layers
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* of workspace handling.
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*
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* For each client dwm creates a small title window which is resized whenever
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* the WM_NAME or _NET_WM_NAME properties are updated or the client is resized.
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* Keys and tagging rules are organized as arrays and defined in the config.h
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* file. These arrays are kept static in event.o and tag.o respectively,
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* because no other part of dwm needs access to them. The current mode is
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* represented by the arrange function pointer which wether points to dofloat
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* or dotile.
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*
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* To understand everything else, start with reading main.c:main().
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*/
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#include "config.h"
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#include <X11/Xlib.h>
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/* mask shorthands, used in event.c and client.c */
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#define BUTTONMASK (ButtonPressMask | ButtonReleaseMask)
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#define MOUSEMASK (BUTTONMASK | PointerMotionMask)
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#define PROTODELWIN 1
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enum { NetSupported, NetWMName, NetLast }; /* EWMH atoms */
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enum { WMProtocols, WMDelete, WMLast }; /* default atoms */
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enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
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enum { ColFG, ColBG, ColLast }; /* color */
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typedef enum {
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TopLeft, TopRight, BotLeft, BotRight
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} Corner; /* window corners */
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typedef union {
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const char *cmd;
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int i;
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} Arg; /* argument type */
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typedef struct {
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int ascent;
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int descent;
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int height;
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XFontSet set;
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XFontStruct *xfont;
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} Fnt;
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typedef struct {
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int x, y, w, h;
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unsigned long norm[ColLast];
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unsigned long sel[ColLast];
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unsigned long status[ColLast];
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Drawable drawable;
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Fnt font;
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GC gc;
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} DC; /* draw context */
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typedef struct Client Client;
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struct Client {
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char name[256];
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int proto;
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int x, y, w, h;
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int tx, ty, tw, th; /* title window geometry */
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int basew, baseh, incw, inch, maxw, maxh, minw, minh;
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int grav;
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long flags;
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unsigned int border, weight;
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Bool isfloat;
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Bool *tags;
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Client *next;
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Client *prev;
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Client *snext;
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Window win;
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Window twin;
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};
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extern const char *tags[]; /* all tags */
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extern char stext[1024]; /* status text */
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extern int bx, by, bw, bh, bmw; /* bar geometry, bar mode label width */
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extern int mw, screen, sx, sy, sw, sh; /* screen geometry, master width */
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extern unsigned int ntags, numlockmask; /* number of tags, dynamic lock mask */
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extern void (*handler[LASTEvent])(XEvent *); /* event handler */
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extern void (*arrange)(Arg *); /* arrange function, indicates mode */
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extern Atom wmatom[WMLast], netatom[NetLast];
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extern Bool running, issel, maximized, *seltag; /* seltag is array of Bool */
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extern Client *clients, *sel, *stack; /* global cleint list and stack */
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extern Cursor cursor[CurLast];
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extern DC dc; /* global draw context */
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extern Display *dpy;
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extern Window root, barwin;
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/* client.c */
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extern void ban(Client *c); /* ban c from screen */
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extern void focus(Client *c); /* focus c, c may be NULL */
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extern Client *getclient(Window w); /* return client of w */
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extern Client *getctitle(Window w); /* return client of title window */
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extern void gravitate(Client *c, Bool invert); /* gravitate c */
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extern void killclient(Arg *arg); /* kill c nicely */
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extern void manage(Window w, XWindowAttributes *wa); /* manage new client */
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extern void resize(Client *c, Bool sizehints, Corner sticky); /* resize c*/
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extern void updatesize(Client *c); /* update the size structs of c */
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extern void updatetitle(Client *c); /* update the name of c */
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extern void togglemax(Arg *arg); /* (un)maximize c */
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extern void unmanage(Client *c); /* destroy c */
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/* draw.c */
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extern void drawall(); /* draw all visible client titles and the bar */
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extern void drawstatus(); /* draw the bar */
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extern void drawtitle(Client *c); /* draw title of c */
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extern unsigned long getcolor(const char *colstr); /* return color of colstr */
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extern void setfont(const char *fontstr); /* set the font for DC */
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extern unsigned int textw(const char *text); /* return the width of text in px*/
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/* event.c */
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extern void grabkeys(); /* grab all keys defined in config.h */
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extern void procevent(); /* process pending X events */
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/* main.c */
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extern int getproto(Window w); /* return protocol mask of WMProtocols property of w */
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extern void quit(Arg *arg); /* quit dwm nicely */
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extern void sendevent(Window w, Atom a, long value); /* send synthetic event to w */
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extern int xerror(Display *dsply, XErrorEvent *ee); /* dwm's X error handler */
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/* tag.c */
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extern void initrregs(); /* initialize regexps of rules defined in config.h */
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extern Client *getnext(Client *c); /* returns next visible client */
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extern Client *getprev(Client *c); /* returns previous visible client */
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extern void settags(Client *c, Client *trans); /* sets tags of c */
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extern void tag(Arg *arg); /* tags c with arg's index */
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extern void toggletag(Arg *arg); /* toggles c tags with arg's index */
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/* util.c */
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extern void *emallocz(unsigned int size); /* allocates zero-initialized memory, exits on error */
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extern void eprint(const char *errstr, ...); /* prints errstr and exits with 1 */
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extern void *erealloc(void *ptr, unsigned int size); /* reallocates memory, exits on error */
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extern void spawn(Arg *arg); /* forks a new subprocess with to arg's cmd */
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/* view.c */
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extern void detach(Client *c); /* detaches c from global client list */
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extern void dofloat(Arg *arg); /* arranges all windows floating, arg is ignored */
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extern void dotile(Arg *arg); /* arranges all windows, arg is ignored */
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extern void focusnext(Arg *arg); /* focuses next visible client, arg is ignored */
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extern void focusprev(Arg *arg); /* focuses previous visible client, arg is ignored */
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extern Bool isvisible(Client *c); /* returns True if client is visible */
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extern void resizecol(Arg *arg); /* resizes the master width with arg's index value */
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extern void restack(); /* restores z layers of all clients */
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extern void togglemode(Arg *arg); /* toggles global arrange function (dotile/dofloat) */
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extern void toggleview(Arg *arg); /* toggles the tag with arg's index (in)visible */
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extern void view(Arg *arg); /* views the tag with arg's index */
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extern void viewall(Arg *arg); /* views all tags, arg is ignored */
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extern void zoom(Arg *arg); /* zooms the focused client to master column, arg is ignored */
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