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1 /* (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>
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2 * See LICENSE file for license details.
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3 *
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4 * dynamic window manager is designed like any other X client as well. It is
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5 * driven through handling X events. In contrast to other X clients, a window
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6 * manager selects for SubstructureRedirectMask on the root window, to receive
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7 * events about window (dis-)appearance. Only one X connection at a time is
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8 * allowed to select for this event mask.
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9 *
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10 * Calls to fetch an X event from the event queue are blocking. Due reading
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11 * status text from standard input, a select()-driven main loop has been
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12 * implemented which selects for reads on the X connection and STDIN_FILENO to
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13 * handle all data smoothly. The event handlers of dwm are organized in an
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14 * array which is accessed whenever a new event has been fetched. This allows
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15 * event dispatching in O(1) time.
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16 *
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17 * Each child of the root window is called a client, except windows which have
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18 * set the override_redirect flag. Clients are organized in a global
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19 * doubly-linked client list, the focus history is remembered through a global
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20 * stack list. Each client contains an array of Bools of the same size as the
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21 * global tags array to indicate the tags of a client. For each client dwm
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22 * creates a small title window, which is resized whenever the (_NET_)WM_NAME
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23 * properties are updated or the client is moved/resized.
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24 *
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25 * Keys and tagging rules are organized as arrays and defined in the config.h
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26 * file. These arrays are kept static in event.o and tag.o respectively,
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27 * because no other part of dwm needs access to them. The current layout is
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28 * represented by the lt pointer.
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29 *
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30 * To understand everything else, start reading main.c:main().
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31 */
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32
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33 #include "config.h"
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34 #include <X11/Xlib.h>
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35
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36 /* mask shorthands, used in event.c and client.c */
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37 #define BUTTONMASK (ButtonPressMask | ButtonReleaseMask)
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38
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39 enum { NetSupported, NetWMName, NetLast }; /* EWMH atoms */
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40 enum { WMProtocols, WMDelete, WMState, WMLast }; /* default atoms */
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41 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
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42 enum { ColBorder, ColFG, ColBG, ColLast }; /* color */
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43
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44 typedef union {
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45 const char *cmd;
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46 int i;
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47 } Arg; /* argument type */
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48
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49 typedef struct {
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50 int ascent;
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51 int descent;
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52 int height;
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53 XFontSet set;
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54 XFontStruct *xfont;
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55 } Fnt;
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56
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57 typedef struct {
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58 int x, y, w, h;
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59 unsigned long norm[ColLast];
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60 unsigned long sel[ColLast];
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61 Drawable drawable;
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62 Fnt font;
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63 GC gc;
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64 } DC; /* draw context */
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65
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66 typedef struct Client Client;
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67 struct Client {
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68 char name[256];
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69 int x, y, w, h;
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70 int rx, ry, rw, rh; /* revert geometry */
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71 int basew, baseh, incw, inch, maxw, maxh, minw, minh;
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72 int minax, minay, maxax, maxay;
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73 long flags;
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74 unsigned int border;
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75 Bool isbanned, isfixed, ismax, isversatile;
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76 Bool *tags;
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77 Client *next;
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78 Client *prev;
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79 Client *snext;
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80 Window win;
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81 };
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82
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83 typedef struct {
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84 const char *symbol;
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85 void (*arrange)(void);
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86 } Layout;
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87
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88 extern const char *tags[]; /* all tags */
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89 extern char stext[256]; /* status text */
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90 extern int screen, sx, sy, sw, sh; /* screen geometry */
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91 extern int wax, way, wah, waw; /* windowarea geometry */
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92 extern unsigned int bh, blw; /* bar height, bar layout label width */
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93 extern unsigned int master, nmaster; /* master percent, number of master clients */
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94 extern unsigned int ntags, numlockmask; /* number of tags, dynamic lock mask */
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95 extern void (*handler[LASTEvent])(XEvent *); /* event handler */
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96 extern Atom wmatom[WMLast], netatom[NetLast];
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97 extern Bool selscreen, *seltag; /* seltag is array of Bool */
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98 extern Client *clients, *sel, *stack; /* global client list and stack */
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99 extern Cursor cursor[CurLast];
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100 extern DC dc; /* global draw context */
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101 extern Display *dpy;
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102 extern Layout *lt;
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103 extern Window root, barwin;
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104
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105 /* client.c */
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106 extern void configure(Client *c); /* send synthetic configure event */
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107 extern void focus(Client *c); /* focus c, c may be NULL */
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108 extern void killclient(Arg *arg); /* kill c nicely */
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109 extern void manage(Window w, XWindowAttributes *wa); /* manage new client */
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110 extern void resize(Client *c, int x, int y,
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111 int w, int h, Bool sizehints); /* resize with given coordinates c*/
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112 extern void toggleversatile(Arg *arg); /* toggles focused client between versatile/and non-versatile state */
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113 extern void updatesizehints(Client *c); /* update the size hint variables of c */
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114 extern void updatetitle(Client *c); /* update the name of c */
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115 extern void unmanage(Client *c); /* destroy c */
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116 extern void zoom(Arg *arg); /* zooms the focused client to master area, arg is ignored */
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117 extern void pushup(Arg *arg);
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118 extern void pushdown(Arg *arg);
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119 extern void moveresize(Arg *arg);
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120
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121 /* draw.c */
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122 extern void drawstatus(void); /* draw the bar */
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123 extern void drawtext(const char *text,
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124 unsigned long col[ColLast]); /* draw text */
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125 extern unsigned int textw(const char *text); /* return the width of text in px*/
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126
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127 /* event.c */
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128 extern void grabkeys(void); /* grab all keys defined in config.h */
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129
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130 /* layout.c */
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131 extern void focusnext(Arg *arg); /* focuses next visible client, arg is ignored */
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132 extern void focusprev(Arg *arg); /* focuses previous visible client, arg is ignored */
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133 extern void incnmaster(Arg *arg); /* increments nmaster with arg's index value */
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134 extern void initlayouts(void); /* initialize layout array */
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135 extern Client *nexttiled(Client *c); /* returns tiled successor of c */
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136 extern void resizemaster(Arg *arg); /* resizes the master percent with arg's index value */
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137 extern void restack(void); /* restores z layers of all clients */
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138 extern void setlayout(Arg *arg); /* sets layout, -1 toggles */
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139 extern void versatile(void); /* arranges all windows versatile */
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140
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141 /* main.c */
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142 extern void quit(Arg *arg); /* quit dwm nicely */
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143 extern void sendevent(Window w, Atom a, long value); /* send synthetic event to w */
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144 extern int xerror(Display *dsply, XErrorEvent *ee); /* dwm's X error handler */
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145
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146 /* tag.c */
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147 extern void compileregs(void); /* initialize regexps of rules defined in config.h */
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148 extern Bool isvisible(Client *c); /* returns True if client is visible */
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149 extern void settags(Client *c, Client *trans); /* sets tags of c */
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150 extern void tag(Arg *arg); /* tags c with arg's index */
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151 extern void toggletag(Arg *arg); /* toggles c tags with arg's index */
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152 extern void toggleview(Arg *arg); /* toggles the tag with arg's index (in)visible */
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153 extern void view(Arg *arg); /* views the tag with arg's index */
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154 extern void last_view(Arg *arg); /* go to last viewed tag */
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155
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156 /* util.c */
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157 extern void *emallocz(unsigned int size); /* allocates zero-initialized memory, exits on error */
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158 extern void eprint(const char *errstr, ...); /* prints errstr and exits with 1 */
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159 extern void spawn(Arg *arg); /* forks a new subprocess with arg's cmd */
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160
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