1/* See LICENSE file for copyright and license details.
  2 *
  3 * dynamic window manager is designed like any other X client as well. It is
  4 * driven through handling X events. In contrast to other X clients, a window
  5 * manager selects for SubstructureRedirectMask on the root window, to receive
  6 * events about window (dis-)appearance.  Only one X connection at a time is
  7 * allowed to select for this event mask.
  8 *
  9 * Calls to fetch an X event from the event queue are blocking.  Due reading
 10 * status text from standard input, a select()-driven main loop has been
 11 * implemented which selects for reads on the X connection and STDIN_FILENO to
 12 * handle all data smoothly. The event handlers of dwm are organized in an
 13 * array which is accessed whenever a new event has been fetched. This allows
 14 * event dispatching in O(1) time.
 15 *
 16 * Each child of the root window is called a client, except windows which have
 17 * set the override_redirect flag.  Clients are organized in a global
 18 * doubly-linked client list, the focus history is remembered through a global
 19 * stack list. Each client contains an array of Bools of the same size as the
 20 * global tags array to indicate the tags of a client.  For each client dwm
 21 * creates a small title window, which is resized whenever the (_NET_)WM_NAME
 22 * properties are updated or the client is moved/resized.
 23 *
 24 * Keys and tagging rules are organized as arrays and defined in the config.h
 25 * file. These arrays are kept static in event.o and tag.o respectively,
 26 * because no other part of dwm needs access to them.  The current layout is
 27 * represented by the lt pointer.
 28 *
 29 * To understand everything else, start reading main.c:main().
 30 */
 31
 32#include "config.h"
 33#include <X11/Xlib.h>
 34
 35/* mask shorthands, used in event.c and client.c */
 36#define BUTTONMASK		(ButtonPressMask | ButtonReleaseMask)
 37
 38enum { BarTop, BarBot, BarOff };			/* bar position */
 39enum { CurNormal, CurResize, CurMove, CurLast };	/* cursor */
 40enum { ColBorder, ColFG, ColBG, ColLast };		/* color */
 41enum { NetSupported, NetWMName, NetLast };		/* EWMH atoms */
 42enum { WMProtocols, WMDelete, WMState, WMLast };	/* default atoms */
 43
 44typedef struct Client Client;
 45struct Client {
 46	char name[256];
 47	int x, y, w, h;
 48	int rx, ry, rw, rh; /* revert geometry */
 49	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
 50	int minax, maxax, minay, maxay;
 51	long flags; 
 52	unsigned int border, oldborder;
 53	Bool isbanned, isfixed, ismax, isfloating;
 54	Bool *tags;
 55	Client *next;
 56	Client *prev;
 57	Client *snext;
 58	Window win;
 59};
 60
 61typedef struct {
 62	int x, y, w, h;
 63	unsigned long norm[ColLast];
 64	unsigned long sel[ColLast];
 65	Drawable drawable;
 66	GC gc;
 67	struct {
 68		int ascent;
 69		int descent;
 70		int height;
 71		XFontSet set;
 72		XFontStruct *xfont;
 73	} font;
 74} DC; /* draw context */
 75
 76typedef struct {
 77	const char *symbol;
 78	void (*arrange)(void);
 79} Layout;
 80
 81extern const char *tags[];			/* all tags */
 82extern char stext[256];				/* status text */
 83extern int screen, sx, sy, sw, sh;		/* screen geometry */
 84extern int wax, way, wah, waw;			/* windowarea geometry */
 85extern unsigned int bh, blw, bpos;		/* bar height, bar layout label width, bar position */
 86extern unsigned int ntags, numlockmask;		/* number of tags, numlock mask */
 87extern void (*handler[LASTEvent])(XEvent *);	/* event handler */
 88extern Atom wmatom[WMLast], netatom[NetLast];
 89extern Bool selscreen, *seltag;			/* seltag is array of Bool */
 90extern Client *clients, *sel, *stack;		/* global client list and stack */
 91extern Cursor cursor[CurLast];
 92extern DC dc;					/* global draw context */
 93extern Display *dpy;
 94extern Layout *lt;
 95extern Window root, barwin;
 96
 97/* client.c */
 98void attach(Client *c);			/* attaches c to global client list */
 99void ban(Client *c);			/* bans c */
100void configure(Client *c);		/* send synthetic configure event */
101void detach(Client *c);			/* detaches c from global client list */
102void focus(Client *c);			/* focus c if visible && !NULL, or focus top visible */
103void killclient(const char *arg);	/* kill sel  nicely */
104void manage(Window w, XWindowAttributes *wa);	/* manage new client */
105void resize(Client *c, int x, int y,
106		int w, int h, Bool sizehints);	/* resize with given coordinates c*/
107void togglefloating(const char *arg);	/* toggles sel between floating/tiled state */
108void unban(Client *c);			/* unbans c */
109void unmanage(Client *c);		/* destroy c */
110void updatesizehints(Client *c);	/* update the size hint variables of c */
111void updatetitle(Client *c);		/* update the name of c */
112
113/* draw.c */
114void drawstatus(void);			/* draw the bar */
115void drawtext(const char *text, unsigned long col[ColLast]);	/* draw text */
116unsigned int textw(const char *text);	/* return the width of text in px*/
117
118/* event.c */
119void grabkeys(void);			/* grab all keys defined in config.h */
120
121/* layout.c */
122void floating(void);			/* arranges all windows floating */
123void focusclient(const char *arg);	/* focuses next(1)/previous(-1) visible client */
124void incmasterw(const char *arg);	/* increments the master width with arg's index value */
125void incnmaster(const char *arg);	/* increments nmaster with arg's index value */
126void initlayouts(void);			/* initialize layout array */
127Client *nexttiled(Client *c);		/* returns tiled successor of c */
128void restack(void);			/* restores z layers of all clients */
129void setlayout(const char *arg);	/* sets layout, NULL means next layout */
130void togglebar(const char *arg);	/* shows/hides the bar */
131void togglemax(const char *arg);	/* toggles maximization of floating client */
132void zoom(const char *arg);		/* zooms the focused client to master area, arg is ignored */
133
134/* main.c */
135void updatebarpos(void);		/* updates the bar position */
136void quit(const char *arg);		/* quit dwm nicely */
137int xerror(Display *dsply, XErrorEvent *ee);	/* dwm's X error handler */
138
139/* tag.c */
140void compileregs(void);			/* initialize regexps of rules defined in config.h */
141Bool isvisible(Client *c);		/* returns True if client is visible */
142void settags(Client *c, Client *trans);	/* sets tags of c */
143void tag(const char *arg);		/* tags sel with arg's index */
144void toggletag(const char *arg);	/* toggles sel tags with arg's index */
145void toggleview(const char *arg);	/* toggles the tag with arg's index (in)visible */
146void view(const char *arg);		/* views the tag with arg's index */
147
148/* util.c */
149void *emallocz(unsigned int size);	/* allocates zero-initialized memory, exits on error */
150void eprint(const char *errstr, ...);	/* prints errstr and exits with 1 */
151void spawn(const char *arg);		/* forks a new subprocess with arg's cmd */