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
  33 using std::string;
  34
  35 keytree::keytree(Display *display, epist *ep)
  36   : _display(display), _timeout_screen(NULL), _timer(NULL), _epist(ep)
  37 {
  38   _head = new keynode;
  39   _head->parent = NULL;
  40   _head->action = NULL; // head's action is always NULL
  41   _current = _head;
  42   // for complete initialization, initialize() has to be called as well. We
  43   // call initialize() when we are certain that the config object (which the
  44   // timer uses) has been fully initialized. (see parser::parse())
  45 }
  46
  47 keytree::~keytree()
  48 {
  49   clearTree(_head);
  50   delete _timer;
  51 }
  52
  53 void keytree::unloadBindings()
  54 {
  55   ChildList::iterator it, end = _head->children.end();
  56   for (it = _head->children.begin(); it != end; ++it)
  57     clearTree(*it);
  58
  59   _head->children.clear();
  60   reset();
  61 }
  62
  63 void keytree::clearTree(keynode *node)
  64 {
  65   if (!node)
  66     return;
  67
  68   ChildList::iterator it, end = node->children.end();
  69   for (it = node->children.begin(); it != end; ++it)
  70     clearTree(*it);
  71
  72   node->children.clear();
  73
  74   if (node->action)
  75     delete node->action;
  76   delete node;
  77   node = NULL;
  78 }
  79
  80 void keytree::grabDefaults(screen *scr)
  81 {
  82   grabChildren(_head, scr);
  83 }
  84
  85 void keytree::ungrabDefaults(screen *scr)
  86 {
  87   ChildList::const_iterator it, end = _head->children.end();
  88   for (it = _head->children.begin(); it != end; ++it)
  89     if ( (*it)->action && (*it)->action->type() != Action::toggleGrabs)
  90       scr->ungrabKey( (*it)->action->keycode(), (*it)->action->modifierMask() );
  91 }
  92
  93 void keytree::grabChildren(keynode *node, screen *scr)
  94 {
  95   ChildList::const_iterator it, end = node->children.end();
  96   for (it = node->children.begin(); it != end; ++it)
  97     if ( (*it)->action )
  98       scr->grabKey( (*it)->action->keycode(), (*it)->action->modifierMask() );
  99 }
 100
 101 void keytree::ungrabChildren(keynode *node, screen *scr)
 102 {
 103   ChildList::const_iterator head_it, head_end = _head->children.end();
 104   ChildList::const_iterator it, end = node->children.end();
 105   bool ungrab = true;
 106
 107   // when ungrabbing children, make sure that we don't ungrab any topmost keys
 108   // (children of the head node) This would render those topmost keys useless.
 109   // Topmost keys are _never_ ungrabbed, since they are only grabbed at startup
 110
 111   for (it = node->children.begin(); it != end; ++it) {
 112     if ( (*it)->action ) {
 113       for (head_it = _head->children.begin(); head_it != head_end; ++head_it) {
 114         if ( (*it)->action->modifierMask() == (*head_it)->action->modifierMask() &&
 115              (*it)->action->keycode() == (*head_it)->action->keycode())
 116         {
 117           ungrab = false;
 118           break;
 119         }
 120       }
 121
 122       if (ungrab)
 123         scr->ungrabKey( (*it)->action->keycode(), (*it)->action->modifierMask());
 124
 125       ungrab = true;
 126     }
 127   }
 128 }
 129
 130 const Action * keytree::getAction(const XEvent &e, unsigned int state,
 131                                   screen *scr)
 132 {
 133   Action *act;
 134
 135   // we're done with the children. ungrab them
 136   if (_current != _head)
 137     ungrabChildren(_current, scr);
 138
 139   ChildList::const_iterator it, end = _current->children.end();
 140   for (it = _current->children.begin(); it != end; ++it) {
 141     act = (*it)->action;
 142     if (e.xkey.keycode == act->keycode() && state == act->modifierMask()) {
 143       if (act->type() == Action::cancelChain) {
 144         // user is cancelling the chain explicitly
 145         _current = _head;
 146         return (const Action *)NULL;
 147       }
 148       else if ( isLeaf(*it) ) {
 149         // node is a leaf, so an action will be executed
 150         if (_timer->isTiming()) {
 151           _timer->stop();
 152           _timeout_screen = NULL;
 153         }
 154
 155         _current = _head;
 156         return act;
 157       }
 158       else {
 159         // node is not a leaf, so we advance down the tree, and grab the
 160         // children of the new current node. no action is executed
 161         if (_timer->isTiming())
 162           _timer->stop();
 163         _timer->start();
 164         _timeout_screen = scr;
 165
 166         _current = *it;
 167         grabChildren(_current, scr);
 168         return (const Action *)NULL;
 169       }
 170     }
 171   }
 172
 173   // action not found. back to the head
 174   _current = _head;
 175   return (const Action *)NULL;
 176 }
 177
 178 void keytree::addAction(Action::ActionType action, unsigned int mask,
 179                         string key, string arg)
 180 {
 181   keynode *tmp = new keynode;
 182
 183   if (action == Action::toggleGrabs && _current != _head) {
 184     // the toggleGrabs key can only be set up as a root key, since if
 185     // it was a chain key, we'd have to not ungrab the whole chain up
 186     // to that key. which kinda defeats the purpose of this function.
 187     return;
 188   }
 189
 190   tmp->action = new Action(action,
 191                            XKeysymToKeycode(_display,
 192                                             XStringToKeysym(key.c_str())),
 193                            mask, arg);
 194   tmp->parent = _current;
 195   _current->children.push_back(tmp);
 196 }
 197
 198 void keytree::advanceOnNewNode()
 199 {
 200   keynode *tmp = new keynode;
 201   tmp->action = NULL;
 202   tmp->parent = _current;
 203   _current->children.push_back(tmp);
 204   _current = tmp;
 205 }
 206
 207 void keytree::retract()
 208 {
 209   if (_current != _head)
 210     _current = _current->parent;
 211 }
 212
 213 void keytree::setCurrentNodeProps(Action::ActionType action, unsigned int mask,
 214                                   string key, string arg)
 215 {
 216   if (_current->action)
 217     delete _current->action;
 218
 219   _current->action = new Action(action,
 220                                 XKeysymToKeycode(_display,
 221                                                  XStringToKeysym(key.c_str())),
 222                                 mask, arg);
 223 }
 224
 225 void keytree::initialize(void)
 226 {
 227   int tval = 0;
 228
 229   _epist->getConfig()->getValue(Config::chainTimeout, tval);
 230   _timer = new BTimer(_epist, this);
 231
 232   if (tval <= 0)
 233     tval = 3000; // set default timeout to 3 seconds
 234
 235   _timer->setTimeout(tval);
 236 }
 237
 238 void keytree::timeout(void)
 239 {
 240   assert(_timeout_screen != NULL);
 241
 242   if (_current != _head) {
 243     ungrabChildren(_current, _timeout_screen);
 244     _current = _head;
 245   }
 246   _timeout_screen = NULL;
 247 }