1/* © 2006-2007 Anselm R. Garbe <garbeam at gmail dot com>
  2 * © 2006-2007 Sander van Dijk <a dot h dot vandijk at gmail dot com>
  3 * © 2007 Premysl Hruby <dfenze at gmail dot com>
  4 * © 2007 Szabolcs Nagy <nszabolcs at gmail dot com>
  5 * See LICENSE file for license details.
  6 *
  7 * dynamic window manager is designed like any other X client as well. It is
  8 * driven through handling X events. In contrast to other X clients, a window
  9 * manager selects for SubstructureRedirectMask on the root window, to receive
 10 * events about window (dis-)appearance.  Only one X connection at a time is
 11 * allowed to select for this event mask.
 12 *
 13 * Calls to fetch an X event from the event queue are blocking.  Due reading
 14 * status text from standard input, a select()-driven main loop has been
 15 * implemented which selects for reads on the X connection and STDIN_FILENO to
 16 * handle all data smoothly. The event handlers of dwm are organized in an
 17 * array which is accessed whenever a new event has been fetched. This allows
 18 * event dispatching in O(1) time.
 19 *
 20 * Each child of the root window is called a client, except windows which have
 21 * set the override_redirect flag.  Clients are organized in a global
 22 * doubly-linked client list, the focus history is remembered through a global
 23 * stack list. Each client contains an array of Bools of the same size as the
 24 * global tags array to indicate the tags of a client.  For each client dwm
 25 * creates a small title window, which is resized whenever the (_NET_)WM_NAME
 26 * properties are updated or the client is moved/resized.
 27 *
 28 * Keys and tagging rules are organized as arrays and defined in the config.h
 29 * file. These arrays are kept static in event.o and tag.o respectively,
 30 * because no other part of dwm needs access to them.  The current layout is
 31 * represented by the lt pointer.
 32 *
 33 * To understand everything else, start reading main.c:main().
 34 */
 35
 36#include "config.h"
 37#include <X11/Xlib.h>
 38
 39/* mask shorthands, used in event.c and client.c */
 40#define BUTTONMASK		(ButtonPressMask | ButtonReleaseMask)
 41
 42enum { BarTop, BarBot, BarOff };			/* bar position */
 43enum { CurNormal, CurResize, CurMove, CurLast };	/* cursor */
 44enum { ColBorder, ColFG, ColBG, ColLast };		/* color */
 45enum { NetSupported, NetWMName, NetLast };		/* EWMH atoms */
 46enum { WMProtocols, WMDelete, WMState, WMLast };	/* default atoms */
 47
 48typedef struct Client Client;
 49struct Client {
 50	char name[256];
 51	int x, y, w, h;
 52	int rx, ry, rw, rh; /* revert geometry */
 53	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
 54	int minax, maxax, minay, maxay;
 55	long flags; 
 56	unsigned int border, oldborder;
 57	Bool isbanned, isfixed, ismax, isfloating;
 58	Bool *tags;
 59	Client *next;
 60	Client *prev;
 61	Client *snext;
 62	Window win;
 63};
 64
 65typedef struct {
 66	int x, y, w, h;
 67	unsigned long norm[ColLast];
 68	unsigned long sel[ColLast];
 69	Drawable drawable;
 70	GC gc;
 71	struct {
 72		int ascent;
 73		int descent;
 74		int height;
 75		XFontSet set;
 76		XFontStruct *xfont;
 77	} font;
 78} DC; /* draw context */
 79
 80typedef struct {
 81	const char *symbol;
 82	void (*arrange)(void);
 83} Layout;
 84
 85extern const char *tags[];		/* all tags */
 86char stext[256];			/* status text */
 87int screen, sx, sy, sw, sh;		/* screen geometry */
 88int wax, way, wah, waw;			/* windowarea geometry */
 89unsigned int bh, blw, bpos;		/* bar height, bar layout label width, bar position */
 90unsigned int ntags, numlockmask;	/* number of tags, dynamic lock mask */
 91void (*handler[LASTEvent])(XEvent *);	/* event handler */
 92Atom wmatom[WMLast], netatom[NetLast];
 93Bool selscreen, *seltag;		/* seltag is array of Bool */
 94Client *clients, *sel, *stack;		/* global client list and stack */
 95Cursor cursor[CurLast];
 96DC dc;					/* global draw context */
 97Display *dpy;
 98Layout *lt;
 99Window root, barwin;
100
101/* client.c */
102void attach(Client *c);			/* attaches c to global client list */
103void configure(Client *c);		/* send synthetic configure event */
104void detach(Client *c);			/* detaches c from global client list */
105void focus(Client *c);			/* focus c if visible && !NULL, or focus top visible */
106void killclient(const char *arg);	/* kill sel  nicely */
107void manage(Window w, XWindowAttributes *wa);	/* manage new client */
108void resize(Client *c, int x, int y,
109		int w, int h, Bool sizehints);	/* resize with given coordinates c*/
110void togglefloating(const char *arg);	/* toggles sel between floating/tiled state */
111void updatesizehints(Client *c);	/* update the size hint variables of c */
112void updatetitle(Client *c);		/* update the name of c */
113void unmanage(Client *c);		/* destroy c */
114
115/* draw.c */
116void drawstatus(void);			/* draw the bar */
117void drawtext(const char *text, unsigned long col[ColLast]);	/* draw text */
118unsigned int textw(const char *text);	/* return the width of text in px*/
119
120/* event.c */
121void grabkeys(void);			/* grab all keys defined in config.h */
122
123/* layout.c */
124void floating(void);			/* arranges all windows floating */
125void focusclient(const char *arg);	/* focuses next(1)/previous(-1) visible client */
126void incmasterw(const char *arg);	/* increments the master width with arg's index value */
127void incnmaster(const char *arg);	/* increments nmaster with arg's index value */
128void initlayouts(void);			/* initialize layout array */
129Client *nexttiled(Client *c);		/* returns tiled successor of c */
130void restack(void);			/* restores z layers of all clients */
131void setlayout(const char *arg);	/* sets layout, NULL means next layout */
132void togglebar(const char *arg);	/* shows/hides the bar */
133void togglemax(const char *arg);	/* toggles maximization of floating client */
134void zoom(const char *arg);		/* zooms the focused client to master area, arg is ignored */
135
136/* main.c */
137void updatebarpos(void);		/* updates the bar position */
138void quit(const char *arg);		/* quit dwm nicely */
139int xerror(Display *dsply, XErrorEvent *ee);	/* dwm's X error handler */
140
141/* tag.c */
142void compileregs(void);			/* initialize regexps of rules defined in config.h */
143Bool isvisible(Client *c);		/* returns True if client is visible */
144void settags(Client *c, Client *trans);	/* sets tags of c */
145void tag(const char *arg);		/* tags sel with arg's index */
146void toggletag(const char *arg);	/* toggles sel tags with arg's index */
147void toggleview(const char *arg);	/* toggles the tag with arg's index (in)visible */
148void view(const char *arg);		/* views the tag with arg's index */
149
150/* util.c */
151void *emallocz(unsigned int size);	/* allocates zero-initialized memory, exits on error */
152void eprint(const char *errstr, ...);	/* prints errstr and exits with 1 */
153void spawn(const char *arg);		/* forks a new subprocess with arg's cmd */