148 lines
6.0 KiB
C
148 lines
6.0 KiB
C
/* See LICENSE file for copyright and 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 selects for SubstructureRedirectMask on the root window, to receive
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* events about window (dis-)appearance. Only one X connection at a time is
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* 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 are blocking. Due reading
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* status text from standard input, a select()-driven main loop has been
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* implemented which selects for reads on the X connection and STDIN_FILENO to
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* handle all data smoothly. The event handlers of dwm are organized in an
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* array which is accessed whenever a new event has been fetched. This allows
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* event dispatching in O(1) time.
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*
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* Each child of the root window is called a client, except windows which have
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* set the override_redirect flag. Clients are organized in a global
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* doubly-linked client list, the focus history is remembered through a global
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* stack list. Each client contains an array of Bools of the same size as the
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* global tags array to indicate the tags of a client. For each client dwm
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* creates a small title window, which is resized whenever the (_NET_)WM_NAME
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* properties are updated or the client is moved/resized.
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*
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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 layout is
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* represented by the lt pointer.
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*
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* To understand everything else, start 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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enum { BarTop, BarBot, BarOff }; /* bar position */
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enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
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enum { ColBorder, ColFG, ColBG, ColLast }; /* color */
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enum { NetSupported, NetWMName, NetLast }; /* EWMH atoms */
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enum { WMProtocols, WMDelete, WMState, WMLast }; /* default atoms */
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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 x, y, w, h;
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int rx, ry, rw, rh; /* revert geometry */
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int basew, baseh, incw, inch, maxw, maxh, minw, minh;
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int minax, maxax, minay, maxay;
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int unmapped;
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long flags;
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unsigned int border, oldborder;
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Bool isbanned, isfixed, ismax, isfloating;
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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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};
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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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Drawable drawable;
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GC gc;
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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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} font;
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} DC; /* draw context */
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typedef struct {
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const char *symbol;
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void (*arrange)(void);
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} Layout;
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extern const char *tags[]; /* all tags */
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extern char stext[256]; /* status text */
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extern int screen, sx, sy, sw, sh; /* screen geometry */
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extern int wax, way, wah, waw; /* windowarea geometry */
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extern unsigned int bh, blw, bpos; /* bar height, bar layout label width, bar position */
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extern unsigned int ntags, numlockmask; /* number of tags, numlock mask */
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extern void (*handler[LASTEvent])(XEvent *); /* event handler */
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extern Atom wmatom[WMLast], netatom[NetLast];
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extern Bool selscreen, *seltag; /* seltag is array of Bool */
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extern Client *clients, *sel, *stack; /* global client 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 Layout *lt;
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extern Window root, barwin;
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/* client.c */
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void attach(Client *c); /* attaches c to global client list */
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void ban(Client *c); /* bans c */
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void configure(Client *c); /* send synthetic configure event */
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void detach(Client *c); /* detaches c from global client list */
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void focus(Client *c); /* focus c if visible && !NULL, or focus top visible */
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void killclient(const char *arg); /* kill sel nicely */
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void manage(Window w, XWindowAttributes *wa); /* manage new client */
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void resize(Client *c, int x, int y,
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int w, int h, Bool sizehints); /* resize with given coordinates c*/
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void togglefloating(const char *arg); /* toggles sel between floating/tiled state */
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void unban(Client *c); /* unbans c */
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void unmanage(Client *c); /* destroy c */
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void updatesizehints(Client *c); /* update the size hint variables of c */
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void updatetitle(Client *c); /* update the name of c */
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/* draw.c */
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void drawstatus(void); /* draw the bar */
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void drawtext(const char *text, unsigned long col[ColLast]); /* draw text */
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unsigned int textw(const char *text); /* return the width of text in px*/
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/* event.c */
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void grabkeys(void); /* grab all keys defined in config.h */
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/* layout.c */
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void focusclient(const char *arg); /* focuses next(1)/previous(-1) visible client */
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void initlayouts(void); /* initialize layout array */
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Client *nexttiled(Client *c); /* returns tiled successor of c */
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void restack(void); /* restores z layers of all clients */
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void setlayout(const char *arg); /* sets layout, NULL means next layout */
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void togglebar(const char *arg); /* shows/hides the bar */
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/* main.c */
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void updatebarpos(void); /* updates the bar position */
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void quit(const char *arg); /* quit dwm nicely */
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int xerror(Display *dsply, XErrorEvent *ee); /* dwm's X error handler */
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/* tag.c */
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void compileregs(void); /* initialize regexps of rules defined in config.h */
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Bool isvisible(Client *c); /* returns True if client is visible */
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void settags(Client *c, Client *trans); /* sets tags of c */
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void tag(const char *arg); /* tags sel with arg's index */
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void toggletag(const char *arg); /* toggles sel tags with arg's index */
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void toggleview(const char *arg); /* toggles the tag with arg's index (in)visible */
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void view(const char *arg); /* views the tag with arg's index */
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/* util.c */
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void *emallocz(unsigned int size); /* allocates zero-initialized memory, exits on error */
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void eprint(const char *errstr, ...); /* prints errstr and exits with 1 */
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void spawn(const char *arg); /* forks a new subprocess with arg's cmd */
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