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, WMName, 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
 76extern const char *tags[];			/* all tags */
 77extern char stext[256];				/* status text */
 78extern int screen, sx, sy, sw, sh;		/* screen geometry */
 79extern int wax, way, wah, waw;			/* windowarea geometry */
 80extern unsigned int bh, blw, bpos;		/* bar height, bar layout label width, bar position */
 81extern unsigned int ntags, numlockmask;		/* number of tags, numlock mask */
 82extern void (*handler[LASTEvent])(XEvent *);	/* event handler */
 83extern Atom wmatom[WMLast], netatom[NetLast];
 84extern Bool selscreen, *seltags;		/* seltags is array of Bool */
 85extern Client *clients, *sel, *stack;		/* global client list and stack */
 86extern Cursor cursor[CurLast];
 87extern DC dc;					/* global draw context */
 88extern Display *dpy;
 89extern Window root, barwin;
 90
 91/* client.c */
 92void attach(Client *c);			/* attaches c to global client list */
 93void ban(Client *c);			/* bans c */
 94void configure(Client *c);		/* send synthetic configure event */
 95void detach(Client *c);			/* detaches c from global client list */
 96void focus(Client *c);			/* focus c if visible && !NULL, or focus top visible */
 97void killclient(const char *arg);	/* kill sel  nicely */
 98void manage(Window w, XWindowAttributes *wa);	/* manage new client */
 99void resize(Client *c, int x, int y,
100		int w, int h, Bool sizehints);	/* resize with given coordinates c*/
101void unban(Client *c);			/* unbans c */
102void unmanage(Client *c);		/* unmanage c */
103void updatesizehints(Client *c);	/* update the size hint variables of c */
104void updatetitle(Client *c);		/* update the name of c */
105
106/* draw.c */
107void drawstatus(void);			/* draw the bar */
108void drawtext(const char *text, unsigned long col[ColLast]);	/* draw text */
109unsigned int textw(const char *text);	/* return the width of text in px*/
110
111/* event.c */
112void grabkeys(void);			/* grab all keys defined in config.h */
113
114/* main.c */
115Bool gettextprop(Window w, Atom atom,
116		char *text, unsigned int size); /* return text property, UTF-8 compliant */
117void quit(const char *arg);			/* quit dwm nicely */
118int xerror(Display *dsply, XErrorEvent *ee);	/* dwm's X error handler */
119
120/* screen.c */
121void applyrules(Client *c);		/* applies rules to c */
122void arrange(void);			/* arranges all windows depending on the layout in use */
123void compileregs(void);			/* initialize regexps of rules defined in config.h */
124void focusnext(const char *arg);	/* focuses next visible client */
125void focusprev(const char *arg);	/* focuses prev visible client */
126const char *getsymbol(void);		/* returns symbol of enabled layout */
127void initlayouts(void);			/* initialize layout array */
128Bool isarrange(void (*func)());		/* returns True if func is the layout function in use */
129Bool isfloating(void);			/* returns True if floating layout is enabled */
130Bool isvisible(Client *c);		/* returns True if client is visible */
131Client *nexttiled(Client *c);		/* returns tiled successor of c */
132void restack(void);			/* restores z layers of all clients */
133void setlayout(const char *arg);	/* sets layout, NULL means next layout */
134void tag(const char *arg);		/* tags sel with arg's index */
135void togglebar(const char *arg);	/* shows/hides the bar */
136void togglefloating(const char *arg);	/* toggles sel between floating/tiled state */
137void togglemax(const char *arg);	/* toggles maximization of floating client */
138void toggletag(const char *arg);	/* toggles sel tags with arg's index */
139void toggleview(const char *arg);	/* toggles the tag with arg's index (in)visible */
140void updatebarpos(void);		/* updates the bar position */
141void view(const char *arg);		/* views the tag with arg's index */
142
143/* util.c */
144void *emallocz(unsigned int size);	/* allocates zero-initialized memory, exits on error */
145void eprint(const char *errstr, ...);	/* prints errstr and exits with 1 */
146void spawn(const char *arg);		/* forks a new subprocess with arg's cmd */