/* (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>
* See LICENSE file for license details.
*
* dynamic window manager is designed like any other X client as well. It is
* driven through handling X events. In contrast to other X clients, a window
* manager selects for SubstructureRedirectMask on the root window, to receive
* events about window (dis-)appearance. Only one X connection at a time is
* allowed to select for this event mask.
*
* Calls to fetch an X event from the event queue are blocking. Due reading
* status text from standard input, a select()-driven main loop has been
* implemented which selects for reads on the X connection and STDIN_FILENO to
* handle all data smoothly. The event handlers of dwm are organized in an
* array which is accessed whenever a new event has been fetched. This allows
* event dispatching in O(1) time.
*
* Each child of the root window is called a client, except windows which have
* set the override_redirect flag. Clients are organized in a global
* doubly-linked client list, the focus history is remembered through a global
* stack list. Each client contains an array of Bools of the same size as the
* global tags array to indicate the tags of a client. For each client dwm
* creates a small title window, which is resized whenever the (_NET_)WM_NAME
* properties are updated or the client is moved/resized.
*
* Keys and tagging rules are organized as arrays and defined in the config.h
* file. These arrays are kept static in event.o and tag.o respectively,
* because no other part of dwm needs access to them. The current layout is
* represented by the lt pointer.
*
* To understand everything else, start reading main.c:main().
*/
#include "config.h"
#include <X11/Xlib.h>
/* mask shorthands, used in event.c and client.c */
#define BUTTONMASK (ButtonPressMask | ButtonReleaseMask)
enum { NetSupported, NetWMName, NetLast }; /* EWMH atoms */
enum { WMProtocols, WMDelete, WMState, WMLast }; /* default atoms */
enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
enum { ColBorder, ColFG, ColBG, ColLast }; /* color */
typedef union {
const char *cmd;
int i;
} Arg; /* argument type */
typedef struct {
int ascent;
int descent;
int height;
XFontSet set;
XFontStruct *xfont;
} Fnt;
typedef struct {
int x, y, w, h;
unsigned long norm[ColLast];
unsigned long sel[ColLast];
Drawable drawable;
Fnt font;
GC gc;
} DC; /* draw context */
typedef struct Client Client;
struct Client {
char name[256];
int x, y, w, h;
int rx, ry, rw, rh; /* revert geometry */
int basew, baseh, incw, inch, maxw, maxh, minw, minh;
int minax, minay, maxax, maxay;
long flags;
unsigned int border;
Bool isbanned, isfixed, ismax, isversatile;
Bool *tags;
Client *next;
Client *prev;
Client *snext;
Window win;
};
typedef struct {
const char *symbol;
void (*arrange)(void);
} Layout;
extern const char *tags[]; /* all tags */
extern char stext[256]; /* status text */
extern int screen, sw, sh; /* screen geometry */
extern int wax, way, wah, waw; /* windowarea geometry */
extern unsigned int bh, blw; /* bar height, bar layout label width */
extern unsigned int master, nmaster; /* master percent, number of master clients */
extern unsigned int ntags, numlockmask; /* number of tags, dynamic lock mask */
extern void (*handler[LASTEvent])(XEvent *); /* event handler */
extern Atom wmatom[WMLast], netatom[NetLast];
extern Bool selscreen, *seltag; /* seltag is array of Bool */
extern Client *clients, *sel, *stack; /* global client list and stack */
extern Cursor cursor[CurLast];
extern DC dc; /* global draw context */
extern Display *dpy;
extern Layout *lt;
extern Window root, barwin;
/* client.c */
extern void configure(Client *c); /* send synthetic configure event */
extern void focus(Client *c); /* focus c, c may be NULL */
extern void killclient(Arg *arg); /* kill c nicely */
extern void manage(Window w, XWindowAttributes *wa); /* manage new client */
extern void resize(Client *c, int x, int y,
int w, int h, Bool sizehints); /* resize with given coordinates c*/
extern void toggleversatile(Arg *arg); /* toggles focused client between versatile/and non-versatile state */
extern void updatesizehints(Client *c); /* update the size hint variables of c */
extern void updatetitle(Client *c); /* update the name of c */
extern void unmanage(Client *c); /* destroy c */
extern void zoom(Arg *arg); /* zooms the focused client to master area, arg is ignored */
/* draw.c */
extern void drawstatus(void); /* draw the bar */
extern void drawtext(const char *text,
unsigned long col[ColLast]); /* draw text */
extern unsigned int textw(const char *text); /* return the width of text in px*/
/* event.c */
extern void grabkeys(void); /* grab all keys defined in config.h */
/* layout.c */
extern void focusnext(Arg *arg); /* focuses next visible client, arg is ignored */
extern void focusprev(Arg *arg); /* focuses previous visible client, arg is ignored */
extern void incnmaster(Arg *arg); /* increments nmaster with arg's index value */
extern void initlayouts(void); /* initialize layout array */
extern Client *nexttiled(Client *c); /* returns tiled successor of c */
extern void resizemaster(Arg *arg); /* resizes the master percent with arg's index value */
extern void restack(void); /* restores z layers of all clients */
extern void setlayout(Arg *arg); /* sets layout, -1 toggles */
extern void versatile(void); /* arranges all windows versatile */
/* main.c */
extern void quit(Arg *arg); /* quit dwm nicely */
extern void sendevent(Window w, Atom a, long value); /* send synthetic event to w */
extern int xerror(Display *dsply, XErrorEvent *ee); /* dwm's X error handler */
/* tag.c */
extern void compileregs(void); /* initialize regexps of rules defined in config.h */
extern Bool isvisible(Client *c); /* returns True if client is visible */
extern void settags(Client *c, Client *trans); /* sets tags of c */
extern void tag(Arg *arg); /* tags c with arg's index */
extern void toggletag(Arg *arg); /* toggles c tags with arg's index */
extern void toggleview(Arg *arg); /* toggles the tag with arg's index (in)visible */
extern void view(Arg *arg); /* views the tag with arg's index */
/* util.c */
extern void *emallocz(unsigned int size); /* allocates zero-initialized memory, exits on error */
extern void eprint(const char *errstr, ...); /* prints errstr and exits with 1 */
extern void spawn(Arg *arg); /* forks a new subprocess with arg's cmd */
