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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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arg@457
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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 like dwm selects for SubstructureRedirectMask on the root window, to
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8 * receive events about child window appearance and disappearance. Only one X
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9 * connection at a time is allowed to select for this event mask by any X
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10 * server, thus only one window manager instance can be executed at a time.
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11 * Any attempt to select for SubstructureRedirectMask by any connection after
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12 * another connection already selected for those events, will result in an
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13 * error generated by the server. Such errors are reported through calling the
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14 * current X error handler.
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15 *
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16 * Calls to pop an X event from the event queue of the X connection are
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17 * blocking. Due the fact, that dwm reads status text from standard input, a
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18 * select-driven main loop has been implemented which selects for reads on the
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19 * X connection and STDIN_FILENO to handle all data smoothly and without
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20 * busy-loop quirks.. The event handlers of dwm are organized in an array
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21 * which is accessed whenever a new event has been popped. This allows event
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22 * dispatching in O(1) time.
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arg@457
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23 *
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24 * Each child window of the root window is called a client in window manager
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25 * terminology, except windows which have set the override_redirect flag.
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26 * Clients are organized in a global doubly-linked client list, the focus
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27 * history is remembered through a global stack list. Each client contains an
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28 * array of Bools of the same size as the global tags array to indicate the
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29 * tags of a client. There are no other data structures to organize the clients
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30 * in tag lists, because a single global list is most simple. All clients which
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31 * have at least one tag enabled of the current tags viewed, will be visible on
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32 * the screen, all other clients are banned to the x-location 2 * screen width.
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33 * This avoids having additional layers of workspace handling.
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34 *
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35 * For each client dwm creates a small title window which is resized whenever
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36 * the WM_NAME or _NET_WM_NAME properties are updated.
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37 *
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38 * Keys and tagging rules are organized as arrays as well and defined in the
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39 * config.h file. These arrays are kept static in event.o and tag.o
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40 * respectively, because no other part of dwm needs access to them.
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41 *
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42 * The current mode is represented by the arrange function pointer which wether
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43 * points to dofloat or dotile.
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44 */
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45
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46 #include "config.h"
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47 #include <X11/Xlib.h>
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48
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49 /* mask shorthands, used in event.c and client.c */
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arg@150
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50 #define BUTTONMASK (ButtonPressMask | ButtonReleaseMask)
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51 #define MOUSEMASK (BUTTONMASK | PointerMotionMask)
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52 #define PROTODELWIN 1
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53
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54 enum { NetSupported, NetWMName, NetLast }; /* EWMH atoms */
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55 enum { WMProtocols, WMDelete, WMLast }; /* default atoms */
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56 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
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57 enum { ColFG, ColBG, ColLast }; /* color */
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58
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59 typedef enum {
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60 TopLeft, TopRight, BotLeft, BotRight
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61 } Corner; /* window corners */
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62
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63 typedef union {
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64 const char *cmd;
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65 int i;
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66 } Arg; /* argument type */
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67
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68 typedef struct {
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69 int ascent;
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70 int descent;
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71 int height;
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72 XFontSet set;
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73 XFontStruct *xfont;
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74 } Fnt;
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75
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76 typedef struct {
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77 int x, y, w, h;
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78 unsigned long norm[ColLast];
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79 unsigned long sel[ColLast];
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80 unsigned long status[ColLast];
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81 Drawable drawable;
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82 Fnt font;
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83 GC gc;
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84 } DC; /* draw context */
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85
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86 typedef struct Client Client;
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87 struct Client {
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88 char name[256];
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89 int proto;
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90 int x, y, w, h;
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91 int tx, ty, tw, th; /* title window geometry */
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92 int basew, baseh, incw, inch, maxw, maxh, minw, minh;
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93 int grav;
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94 long flags;
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95 unsigned int border, weight;
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96 Bool isfloat;
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97 Bool *tags;
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98 Client *next;
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99 Client *prev;
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100 Client *snext;
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101 Window win;
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102 Window twin;
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103 };
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104
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105 extern const char *tags[]; /* all tags */
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106 extern char stext[1024]; /* status text */
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107 extern int bx, by, bw, bh, bmw; /* bar geometry, bar mode label width */
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108 extern int mw, screen, sx, sy, sw, sh; /* screen geometry, master width */
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109 extern unsigned int ntags, numlockmask; /* number of tags, dynamic lock mask */
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110 extern void (*handler[LASTEvent])(XEvent *); /* event handler */
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111 extern void (*arrange)(Arg *); /* arrange function, indicates mode */
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112 extern Atom wmatom[WMLast], netatom[NetLast];
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113 extern Bool running, issel, maximized, *seltag; /* seltag is array of Bool */
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114 extern Client *clients, *sel, *stack; /* global cleint list and stack */
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115 extern Cursor cursor[CurLast];
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116 extern DC dc; /* global draw context */
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117 extern Display *dpy;
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118 extern Window root, barwin;
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119
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120 /* client.c */
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121 extern void ban(Client *c); /* ban c from screen */
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122 extern void focus(Client *c); /* focus c, c may be NULL */
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123 extern Client *getclient(Window w); /* return client of w */
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124 extern Client *getctitle(Window w); /* return client of title window */
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125 extern void gravitate(Client *c, Bool invert); /* gravitate c */
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126 extern void killclient(Arg *arg); /* kill c nicely */
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127 extern void manage(Window w, XWindowAttributes *wa); /* manage new client */
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128 extern void resize(Client *c, Bool sizehints, Corner sticky); /* resize c*/
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129 extern void updatesize(Client *c); /* update the size structs of c */
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130 extern void updatetitle(Client *c); /* update the name of c */
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131 extern void togglemax(Arg *arg); /* (un)maximize c */
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132 extern void unmanage(Client *c); /* destroy c */
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133
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134 /* draw.c */
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135 extern void drawall(); /* draw all visible client titles and the bar */
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136 extern void drawstatus(); /* draw the bar */
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137 extern void drawtitle(Client *c); /* draw title of c */
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138 extern unsigned long getcolor(const char *colstr); /* return color of colstr */
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139 extern void setfont(const char *fontstr); /* set the font for DC */
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140 extern unsigned int textw(const char *text); /* return the width of text in px*/
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141
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142 /* event.c */
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143 extern void grabkeys(); /* grab all keys defined in config.h */
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144 extern void procevent(); /* process pending X events */
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145
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146 /* main.c */
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147 extern int getproto(Window w); /* return protocol mask of WMProtocols property of w */
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148 extern void quit(Arg *arg); /* quit dwm nicely */
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149 extern void sendevent(Window w, Atom a, long value); /* send synthetic event to w */
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150 extern int xerror(Display *dsply, XErrorEvent *ee); /* dwm's X error handler */
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151
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152 /* tag.c */
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153 extern void initrregs(); /* initialize regexps of rules defined in config.h */
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154 extern Client *getnext(Client *c); /* returns next visible client */
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155 extern Client *getprev(Client *c); /* returns previous visible client */
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156 extern void settags(Client *c, Client *trans); /* sets tags of c */
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157 extern void tag(Arg *arg); /* tags c with arg's index */
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158 extern void toggletag(Arg *arg); /* toggles c tags with arg's index */
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159
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160 /* util.c */
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161 extern void *emallocz(unsigned int size); /* allocates zero-initialized memory, exits on error */
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162 extern void eprint(const char *errstr, ...); /* prints errstr and exits with 1 */
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163 extern void *erealloc(void *ptr, unsigned int size); /* reallocates memory, exits on error */
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164 extern void spawn(Arg *arg); /* forks a new subprocess with to arg's cmd */
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165
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166 /* view.c */
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167 extern void detach(Client *c); /* detaches c from global client list */
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168 extern void dofloat(Arg *arg); /* arranges all windows floating, arg is ignored */
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169 extern void dotile(Arg *arg); /* arranges all windows, arg is ignored */
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170 extern void focusnext(Arg *arg); /* focuses next visible client, arg is ignored */
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171 extern void focusprev(Arg *arg); /* focuses previous visible client, arg is ignored */
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172 extern Bool isvisible(Client *c); /* returns True if client is visible */
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173 extern void resizecol(Arg *arg); /* resizes the master width with arg's index value */
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174 extern void restack(); /* restores z layers of all clients */
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175 extern void togglemode(Arg *arg); /* toggles global arrange function (dotile/dofloat) */
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176 extern void toggleview(Arg *arg); /* toggles the tag with arg's index (in)visible */
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177 extern void view(Arg *arg); /* views the tag with arg's index */
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178 extern void viewall(Arg *arg); /* views all tags, arg is ignored */
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179 extern void zoom(Arg *arg); /* zooms the focused client to master column, arg is ignored */
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