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 * See LICENSE file for license details.
  4 *
  5 * dynamic window manager is designed like any other X client as well. It is
  6 * driven through handling X events. In contrast to other X clients, a window
  7 * manager selects for SubstructureRedirectMask on the root window, to receive
  8 * events about window (dis-)appearance.  Only one X connection at a time is
  9 * allowed to select for this event mask.
 10 *
 11 * Calls to fetch an X event from the event queue are blocking.  Due reading
 12 * status text from standard input, a select()-driven main loop has been
 13 * implemented which selects for reads on the X connection and STDIN_FILENO to
 14 * handle all data smoothly. The event handlers of dwm are organized in an
 15 * array which is accessed whenever a new event has been fetched. This allows
 16 * event dispatching in O(1) time.
 17 *
 18 * Each child of the root window is called a client, except windows which have
 19 * set the override_redirect flag.  Clients are organized in a global
 20 * doubly-linked client list, the focus history is remembered through a global
 21 * stack list. Each client contains an array of Bools of the same size as the
 22 * global tags array to indicate the tags of a client.  For each client dwm
 23 * creates a small title window, which is resized whenever the (_NET_)WM_NAME
 24 * properties are updated or the client is moved/resized.
 25 *
 26 * Keys and tagging rules are organized as arrays and defined in the config.h
 27 * file. These arrays are kept static in event.o and tag.o respectively,
 28 * because no other part of dwm needs access to them.  The current layout is
 29 * represented by the lt pointer.
 30 *
 31 * To understand everything else, start reading main.c:main().
 32 */
 33
 34#include "config.h"
 35#include <X11/Xlib.h>
 36
 37/* mask shorthands, used in event.c and client.c */
 38#define BUTTONMASK		(ButtonPressMask | ButtonReleaseMask)
 39
 40enum { BarTop, BarBot, BarOff };			/* bar position */
 41enum { CurNormal, CurResize, CurMove, CurLast };	/* cursor */
 42enum { ColBorder, ColFG, ColBG, ColLast };		/* color */
 43enum { NetSupported, NetWMName, NetLast };		/* EWMH atoms */
 44enum { WMProtocols, WMDelete, WMState, WMLast };	/* default atoms */
 45
 46typedef struct Client Client;
 47struct Client {
 48	char name[256];
 49	int x, y, w, h;
 50	int rx, ry, rw, rh; /* revert geometry */
 51	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
 52	int minax, maxax, minay, maxay;
 53	long flags; 
 54	unsigned int border, oldborder;
 55	Bool isbanned, isfixed, ismax, isfloating;
 56	Bool *tags;
 57	Client *next;
 58	Client *prev;
 59	Client *snext;
 60	Window win;
 61};
 62
 63typedef struct {
 64	int x, y, w, h;
 65	unsigned long norm[ColLast];
 66	unsigned long sel[ColLast];
 67	Drawable drawable;
 68	GC gc;
 69	struct {
 70		int ascent;
 71		int descent;
 72		int height;
 73		XFontSet set;
 74		XFontStruct *xfont;
 75	} font;
 76} DC; /* draw context */
 77
 78typedef struct {
 79	const char *symbol;
 80	void (*arrange)(void);
 81} Layout;
 82
 83extern const char *tags[];		/* all tags */
 84char stext[256];			/* status text */
 85int screen, sx, sy, sw, sh;		/* screen geometry */
 86int wax, way, wah, waw;			/* windowarea geometry */
 87unsigned int bh, blw, bpos;		/* bar height, bar layout label width, bar position */
 88unsigned int ntags, numlockmask;	/* number of tags, dynamic lock mask */
 89void (*handler[LASTEvent])(XEvent *);	/* event handler */
 90Atom wmatom[WMLast], netatom[NetLast];
 91Bool selscreen, *seltag;		/* seltag is array of Bool */
 92Client *clients, *sel, *stack;		/* global client list and stack */
 93Cursor cursor[CurLast];
 94DC dc;					/* global draw context */
 95Display *dpy;
 96Layout *lt;
 97Window root, barwin;
 98
 99/* client.c */
100void attach(Client *c);			/* attaches c to global client list */
101void configure(Client *c);		/* send synthetic configure event */
102void detach(Client *c);			/* detaches c from global client list */
103void focus(Client *c);			/* focus c if visible && !NULL, or focus top visible */
104void killclient(const char *arg);	/* kill sel  nicely */
105void manage(Window w, XWindowAttributes *wa);	/* manage new client */
106void resize(Client *c, int x, int y,
107		int w, int h, Bool sizehints);	/* resize with given coordinates c*/
108void togglefloating(const char *arg);	/* toggles sel between floating/tiled state */
109void updatesizehints(Client *c);	/* update the size hint variables of c */
110void updatetitle(Client *c);		/* update the name of c */
111void unmanage(Client *c);		/* destroy 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 */