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1 /*
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2 * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
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3 * See LICENSE file for license details.
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4 *
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5 * dynamic window manager is designed like any other X client as well. It is
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6 * driven through handling X events. In contrast to other X clients, a window
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7 * manager selects for SubstructureRedirectMask on the root window, to receive
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8 * events about window (dis-)appearance. Only one X connection at a time is
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9 * allowed to select for this event mask.
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10 *
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11 * Calls to fetch an X event from the event queue are blocking. Due reading
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12 * status text from standard input, a select-driven main loop has been
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13 * implemented which selects for reads on the X connection and STDIN_FILENO to
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14 * handle all data smoothly. The event handlers of dwm are organized in an
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15 * array which is accessed whenever a new event has been fetched. This allows
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16 * event dispatching in O(1) time.
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17 *
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18 * Each child of the root window is called a client, except windows which have
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19 * set the override_redirect flag. Clients are organized in a global
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20 * doubly-linked client list, the focus history is remembered through a global
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21 * stack list. Each client contains an array of Bools of the same size as the
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22 * global tags array to indicate the tags of a client. For each client dwm
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23 * creates a small title window, which is resized whenever the (_NET_)WM_NAME
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24 * properties are updated or the client is moved/resized.
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25 *
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26 * Keys and tagging rules are organized as arrays and defined in the config.h
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27 * file. These arrays are kept static in event.o and tag.o respectively,
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28 * because no other part of dwm needs access to them. The current mode is
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29 * represented by the arrange function pointer, which wether points to dofloat
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30 * or dotile.
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31 *
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32 * To understand everything else, start reading main.c:main().
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33 */
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34
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35 #include "config.h"
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36 #include <X11/Xlib.h>
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37
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38 /* mask shorthands, used in event.c and client.c */
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39 #define BUTTONMASK (ButtonPressMask | ButtonReleaseMask)
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40 #define MOUSEMASK (BUTTONMASK | PointerMotionMask)
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41 #define PROTODELWIN 1
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42
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43 enum { NetSupported, NetWMName, NetLast }; /* EWMH atoms */
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44 enum { WMProtocols, WMDelete, WMLast }; /* default atoms */
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45 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
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46 enum { ColFG, ColBG, ColLast }; /* color */
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47
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48 typedef enum {
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49 TopLeft, TopRight, BotLeft, BotRight
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50 } Corner; /* window corners */
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51
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52 typedef union {
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53 const char *cmd;
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54 int i;
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55 } Arg; /* argument type */
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56
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57 typedef struct {
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58 int ascent;
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59 int descent;
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60 int height;
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61 XFontSet set;
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62 XFontStruct *xfont;
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63 } Fnt;
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64
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65 typedef struct {
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66 int x, y, w, h;
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67 unsigned long norm[ColLast];
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68 unsigned long sel[ColLast];
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69 unsigned long status[ColLast];
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70 Drawable drawable;
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71 Fnt font;
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72 GC gc;
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73 } DC; /* draw context */
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74
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75 typedef struct Client Client;
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76 struct Client {
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77 char name[256];
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78 int proto;
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79 int x, y, w, h;
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80 int tx, ty, tw, th; /* title window geometry */
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81 int basew, baseh, incw, inch, maxw, maxh, minw, minh;
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82 int grav;
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83 long flags;
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84 unsigned int border, weight;
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85 Bool isfloat;
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86 Bool *tags;
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87 Client *next;
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88 Client *prev;
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89 Client *snext;
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90 Window win;
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91 Window twin;
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92 };
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93
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94 extern const char *tags[]; /* all tags */
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95 extern char stext[1024]; /* status text */
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96 extern int bx, by, bw, bh, bmw; /* bar geometry, bar mode label width */
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97 extern int mw, screen, sx, sy, sw, sh; /* screen geometry, master width */
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98 extern unsigned int ntags, numlockmask; /* number of tags, dynamic lock mask */
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99 extern void (*handler[LASTEvent])(XEvent *); /* event handler */
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100 extern void (*arrange)(Arg *); /* arrange function, indicates mode */
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101 extern Atom wmatom[WMLast], netatom[NetLast];
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102 extern Bool running, issel, maximized, *seltag; /* seltag is array of Bool */
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103 extern Client *clients, *sel, *stack; /* global cleint list and stack */
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104 extern Cursor cursor[CurLast];
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105 extern DC dc; /* global draw context */
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106 extern Display *dpy;
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107 extern Window root, barwin;
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108
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109 /* client.c */
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110 extern void ban(Client *c); /* ban c from screen */
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111 extern void focus(Client *c); /* focus c, c may be NULL */
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112 extern Client *getclient(Window w); /* return client of w */
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113 extern Client *getctitle(Window w); /* return client of title window */
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114 extern void gravitate(Client *c, Bool invert); /* gravitate c */
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115 extern void killclient(Arg *arg); /* kill c nicely */
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116 extern void manage(Window w, XWindowAttributes *wa); /* manage new client */
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117 extern void resize(Client *c, Bool sizehints, Corner sticky); /* resize c*/
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118 extern void updatesize(Client *c); /* update the size structs of c */
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119 extern void updatetitle(Client *c); /* update the name of c */
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120 extern void togglemax(Arg *arg); /* (un)maximize c */
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121 extern void unmanage(Client *c); /* destroy c */
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122
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123 /* draw.c */
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124 extern void drawall(); /* draw all visible client titles and the bar */
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125 extern void drawstatus(); /* draw the bar */
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126 extern void drawtitle(Client *c); /* draw title of c */
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127 extern unsigned long getcolor(const char *colstr); /* return color of colstr */
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128 extern void setfont(const char *fontstr); /* set the font for DC */
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129 extern unsigned int textw(const char *text); /* return the width of text in px*/
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130
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131 /* event.c */
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132 extern void grabkeys(); /* grab all keys defined in config.h */
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133 extern void procevent(); /* process pending X events */
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134
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135 /* main.c */
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136 extern int getproto(Window w); /* return protocol mask of WMProtocols property of w */
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137 extern void quit(Arg *arg); /* quit dwm nicely */
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138 extern void sendevent(Window w, Atom a, long value); /* send synthetic event to w */
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139 extern int xerror(Display *dsply, XErrorEvent *ee); /* dwm's X error handler */
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140
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141 /* tag.c */
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142 extern void initrregs(); /* initialize regexps of rules defined in config.h */
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143 extern Client *getnext(Client *c); /* returns next visible client */
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144 extern Client *getprev(Client *c); /* returns previous visible client */
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145 extern void settags(Client *c, Client *trans); /* sets tags of c */
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146 extern void tag(Arg *arg); /* tags c with arg's index */
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147 extern void toggletag(Arg *arg); /* toggles c tags with arg's index */
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148
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149 /* util.c */
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150 extern void *emallocz(unsigned int size); /* allocates zero-initialized memory, exits on error */
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151 extern void eprint(const char *errstr, ...); /* prints errstr and exits with 1 */
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152 extern void *erealloc(void *ptr, unsigned int size); /* reallocates memory, exits on error */
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153 extern void spawn(Arg *arg); /* forks a new subprocess with to arg's cmd */
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154
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155 /* view.c */
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156 extern void detach(Client *c); /* detaches c from global client list */
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157 extern void dofloat(Arg *arg); /* arranges all windows floating, arg is ignored */
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158 extern void dotile(Arg *arg); /* arranges all windows, arg is ignored */
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159 extern void focusnext(Arg *arg); /* focuses next visible client, arg is ignored */
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160 extern void focusprev(Arg *arg); /* focuses previous visible client, arg is ignored */
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161 extern Bool isvisible(Client *c); /* returns True if client is visible */
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162 extern void resizecol(Arg *arg); /* resizes the master width with arg's index value */
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163 extern void restack(); /* restores z layers of all clients */
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164 extern void togglemode(Arg *arg); /* toggles global arrange function (dotile/dofloat) */
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165 extern void toggleview(Arg *arg); /* toggles the tag with arg's index (in)visible */
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166 extern void view(Arg *arg); /* views the tag with arg's index */
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167 extern void viewall(Arg *arg); /* views all tags, arg is ignored */
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168 extern void zoom(Arg *arg); /* zooms the focused client to master column, arg is ignored */
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