Dogcows Code - chaz/openbox/blob - util/epist/keytree.cc

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2 // keytree.cc for Epistrophy - a key handler for NETWM/EWMH window managers.
   3 // Copyright (c) 2002 - 2002 Ben Jansens <ben at orodu.net>
   4 //
   5 // Permission is hereby granted, free of charge, to any person obtaining a
   6 // copy of this software and associated documentation files (the "Software"),
   7 // to deal in the Software without restriction, including without limitation
   8 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9 // and/or sell copies of the Software, and to permit persons to whom the
  10 // Software is furnished to do so, subject to the following conditions:
  11 //
  12 // The above copyright notice and this permission notice shall be included in
  13 // all copies or substantial portions of the Software.
  14 //
  15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21 // DEALINGS IN THE SOFTWARE.
  22
  23 #ifdef    HAVE_CONFIG_H
  24 #  include "../../config.h"
  25 #endif // HAVE_CONFIG_H
  26
  27 #include "keytree.hh"
  28 #include "epist.hh"
  29 #include "config.hh"
  30
  31 #include <string>
  32 #include <iostream>
  33
  34 using std::string;
  35
  36 keytree::keytree(Display *display, epist *ep)
  37   : _display(display), _timeout_screen(NULL), _timer(NULL), _epist(ep)
  38 {
  39   _head = new keynode;
  40   _head->parent = NULL;
  41   _head->action = NULL; // head's action is always NULL
  42   _current = _head;
  43   // for complete initialization, initialize() has to be called as well. We
  44   // call initialize() when we are certain that the config object (which the
  45   // timer uses) has been fully initialized. (see parser::parse())
  46 }
  47
  48 keytree::~keytree()
  49 {
  50   clearTree(_head);
  51   delete _timer;
  52 }
  53
  54 void keytree::unloadBindings()
  55 {
  56   ChildList::iterator it, end = _head->children.end();
  57   for (it = _head->children.begin(); it != end; ++it)
  58     clearTree(*it);
  59
  60   _head->children.clear();
  61   reset();
  62 }
  63
  64 void keytree::clearTree(keynode *node)
  65 {
  66   if (!node)
  67     return;
  68
  69   ChildList::iterator it, end = node->children.end();
  70   for (it = node->children.begin(); it != end; ++it)
  71     clearTree(*it);
  72
  73   node->children.clear();
  74
  75   if (node->action)
  76     delete node->action;
  77   delete node;
  78   node = NULL;
  79 }
  80
  81 void keytree::grabDefaults(screen *scr)
  82 {
  83   grabChildren(_head, scr);
  84 }
  85
  86 void keytree::ungrabDefaults(screen *scr)
  87 {
  88   Action *act;
  89
  90   ChildList::const_iterator it, end = _head->children.end();
  91   for (it = _head->children.begin(); it != end; ++it) {
  92     act = (*it)->action;
  93     if (act && act->type() != Action::toggleGrabs)
  94       scr->ungrabKey(act->keycode(), act->modifierMask());
  95   }
  96 }
  97
  98 void keytree::grabChildren(keynode *node, screen *scr)
  99 {
 100   Action *act;
 101
 102   ChildList::const_iterator it, end = node->children.end();
 103   for (it = node->children.begin(); it != end; ++it) {
 104     act = (*it)->action;
 105     if (act)
 106       scr->grabKey(act->keycode(), act->modifierMask());
 107   }
 108 }
 109
 110 void keytree::ungrabChildren(keynode *node, screen *scr)
 111 {
 112   ChildList::const_iterator head_it, head_end = _head->children.end();
 113   ChildList::const_iterator it, end = node->children.end();
 114   bool ungrab = true;
 115
 116   // when ungrabbing children, make sure that we don't ungrab any topmost keys
 117   // (children of the head node) This would render those topmost keys useless.
 118   // Topmost keys are _never_ ungrabbed, since they are only grabbed at startup
 119
 120   for (it = node->children.begin(); it != end; ++it) {
 121     if ( (*it)->action ) {
 122       for (head_it = _head->children.begin(); head_it != head_end; ++head_it) {
 123         if ( (*it)->action->modifierMask() == (*head_it)->action->modifierMask() &&
 124              (*it)->action->keycode() == (*head_it)->action->keycode())
 125         {
 126           ungrab = false;
 127           break;
 128         }
 129       }
 130
 131       if (ungrab)
 132         scr->ungrabKey( (*it)->action->keycode(), (*it)->action->modifierMask());
 133
 134       ungrab = true;
 135     }
 136   }
 137 }
 138
 139 const Action * keytree::getAction(const XEvent &e, unsigned int state,
 140                                   screen *scr)
 141 {
 142   Action *act;
 143
 144   // we're done with the children. ungrab them
 145   if (_current != _head)
 146     ungrabChildren(_current, scr);
 147
 148   ChildList::const_iterator it, end = _current->children.end();
 149   for (it = _current->children.begin(); it != end; ++it) {
 150     act = (*it)->action;
 151     if (e.xkey.keycode == act->keycode() && state == act->modifierMask()) {
 152       if (act->type() == Action::cancelChain) {
 153         // user is cancelling the chain explicitly
 154         _current = _head;
 155         return (const Action *)NULL;
 156       }
 157       else if ( isLeaf(*it) ) {
 158         // node is a leaf, so an action will be executed
 159         if (_timer->isTiming()) {
 160           _timer->stop();
 161           _timeout_screen = NULL;
 162         }
 163
 164         _current = _head;
 165         return act;
 166       }
 167       else {
 168         // node is not a leaf, so we advance down the tree, and grab the
 169         // children of the new current node. no action is executed
 170         if (_timer->isTiming())
 171           _timer->stop();
 172         _timer->start();
 173         _timeout_screen = scr;
 174
 175         _current = *it;
 176         grabChildren(_current, scr);
 177         return (const Action *)NULL;
 178       }
 179     }
 180   }
 181
 182   // action not found. back to the head
 183   _current = _head;
 184   return (const Action *)NULL;
 185 }
 186
 187 void keytree::addAction(Action::ActionType action, unsigned int mask,
 188                         string key, string arg)
 189 {
 190   if (action == Action::toggleGrabs && _current != _head) {
 191     // the toggleGrabs key can only be set up as a root key, since if
 192     // it was a chain key, we'd have to not ungrab the whole chain up
 193     // to that key. which kinda defeats the purpose of this function.
 194     return;
 195   }
 196
 197   KeySym sym = XStringToKeysym(key.c_str());
 198   keynode *tmp = new keynode;
 199
 200   tmp->action = new Action(action,
 201                            XKeysymToKeycode(_display, sym),
 202                            mask, arg);
 203   tmp->parent = _current;
 204   _current->children.push_back(tmp);
 205 }
 206
 207 void keytree::advanceOnNewNode()
 208 {
 209   keynode *tmp = new keynode;
 210   tmp->action = NULL;
 211   tmp->parent = _current;
 212   _current->children.push_back(tmp);
 213   _current = tmp;
 214 }
 215
 216 void keytree::retract()
 217 {
 218   if (_current != _head)
 219     _current = _current->parent;
 220 }
 221
 222 void keytree::setCurrentNodeProps(Action::ActionType action, unsigned int mask,
 223                                   string key, string arg)
 224 {
 225   if (_current->action)
 226     delete _current->action;
 227
 228   KeySym sym = XStringToKeysym(key.c_str());
 229   _current->action = new Action(action,
 230                                 XKeysymToKeycode(_display, sym),
 231                                 mask, arg);
 232 }
 233
 234 void keytree::initialize(void)
 235 {
 236   int tval = 0;
 237
 238   _epist->getConfig()->getValue(Config::chainTimeout, tval);
 239   _timer = new BTimer(_epist, this);
 240
 241   if (tval <= 0)
 242     tval = 3000; // set default timeout to 3 seconds
 243
 244   _timer->setTimeout(tval);
 245 }
 246
 247 void keytree::timeout(void)
 248 {
 249   assert(_timeout_screen != NULL);
 250
 251   if (_current != _head) {
 252     ungrabChildren(_current, _timeout_screen);
 253     _current = _head;
 254   }
 255   _timeout_screen = NULL;
 256 }