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