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 #include "keytree.hh"
  24 #include "epist.hh"
  25 #include "config.hh"
  26
  27 #include <string>
  28
  29 using std::string;
  30
  31 keytree::keytree(Display *display, epist *ep)
  32   : _display(display), _timeout_screen(NULL), _timer(NULL), _epist(ep)
  33 {
  34   _head = new keynode;
  35   _head->parent = NULL;
  36   _head->action = NULL; // head's action is always NULL
  37   _current = _head;
  38   // for complete initialization, initialize() has to be called as well. We
  39   // call initialize() when we are certain that the config object (which the
  40   // timer uses) has been fully initialized. (see parser::parse())
  41 }
  42
  43 keytree::~keytree()
  44 {
  45   clearTree(_head);
  46   delete _timer;
  47 }
  48
  49 void keytree::unloadBindings()
  50 {
  51   ChildList::iterator it, end = _head->children.end();
  52   for (it = _head->children.begin(); it != end; ++it)
  53     clearTree(*it);
  54
  55   _head->children.clear();
  56   reset();
  57 }
  58
  59 void keytree::clearTree(keynode *node)
  60 {
  61   if (!node)
  62     return;
  63
  64   ChildList::iterator it, end = node->children.end();
  65   for (it = node->children.begin(); it != end; ++it)
  66     clearTree(*it);
  67
  68   node->children.clear();
  69
  70   if (node->action)
  71     delete node->action;
  72   delete node;
  73   node = NULL;
  74 }
  75
  76 void keytree::grabDefaults(screen *scr)
  77 {
  78   grabChildren(_head, scr);
  79 }
  80
  81 void keytree::ungrabDefaults(screen *scr)
  82 {
  83   ChildList::const_iterator it, end = _head->children.end();
  84   for (it = _head->children.begin(); it != end; ++it)
  85     if ( (*it)->action )
  86       scr->ungrabKey( (*it)->action->keycode(), (*it)->action->modifierMask() );
  87 }
  88
  89 void keytree::grabChildren(keynode *node, screen *scr)
  90 {
  91   ChildList::const_iterator it, end = node->children.end();
  92   for (it = node->children.begin(); it != end; ++it)
  93     if ( (*it)->action )
  94       scr->grabKey( (*it)->action->keycode(), (*it)->action->modifierMask() );
  95 }
  96
  97 void keytree::ungrabChildren(keynode *node, screen *scr)
  98 {
  99   ChildList::const_iterator head_it, head_end = _head->children.end();
 100   ChildList::const_iterator it, end = node->children.end();
 101   bool ungrab = true;
 102
 103   // when ungrabbing children, make sure that we don't ungrab any topmost keys
 104   // (children of the head node) This would render those topmost keys useless.
 105   // Topmost keys are _never_ ungrabbed, since they are only grabbed at startup
 106
 107   for (it = node->children.begin(); it != end; ++it) {
 108     if ( (*it)->action ) {
 109       for (head_it = _head->children.begin(); head_it != head_end; ++head_it) {
 110         if ( (*it)->action->modifierMask() == (*head_it)->action->modifierMask() &&
 111              (*it)->action->keycode() == (*head_it)->action->keycode())
 112         {
 113           ungrab = false;
 114           break;
 115         }
 116       }
 117
 118       if (ungrab)
 119         scr->ungrabKey( (*it)->action->keycode(), (*it)->action->modifierMask());
 120
 121       ungrab = true;
 122     }
 123   }
 124 }
 125
 126 const Action * keytree::getAction(const XEvent &e, unsigned int state,
 127                                   screen *scr)
 128 {
 129   Action *act;
 130
 131   // we're done with the children. ungrab them
 132   if (_current != _head)
 133     ungrabChildren(_current, scr);
 134
 135   ChildList::const_iterator it, end = _current->children.end();
 136   for (it = _current->children.begin(); it != end; ++it) {
 137     act = (*it)->action;
 138     if (e.xkey.keycode == act->keycode() && state == act->modifierMask()) {
 139       if (act->type() == Action::cancelChain) {
 140         // user is cancelling the chain explicitly
 141         _current = _head;
 142         return (const Action *)NULL;
 143       }
 144       else if ( isLeaf(*it) ) {
 145         // node is a leaf, so an action will be executed
 146         if (_timer->isTiming()) {
 147           _timer->stop();
 148           _timeout_screen = NULL;
 149         }
 150
 151         _current = _head;
 152         return act;
 153       }
 154       else {
 155         // node is not a leaf, so we advance down the tree, and grab the
 156         // children of the new current node. no action is executed
 157         if (_timer->isTiming())
 158           _timer->stop();
 159         _timer->start();
 160         _timeout_screen = scr;
 161
 162         _current = *it;
 163         grabChildren(_current, scr);
 164         return (const Action *)NULL;
 165       }
 166     }
 167   }
 168
 169   // action not found. back to the head
 170   _current = _head;
 171   return (const Action *)NULL;
 172 }
 173
 174 void keytree::addAction(Action::ActionType action, unsigned int mask,
 175                         string key, string arg)
 176 {
 177   keynode *tmp = new keynode;
 178   tmp->action = new Action(action,
 179                            XKeysymToKeycode(_display,
 180                                             XStringToKeysym(key.c_str())),
 181                            mask, arg);
 182   tmp->parent = _current;
 183   _current->children.push_back(tmp);
 184 }
 185
 186 void keytree::advanceOnNewNode()
 187 {
 188   keynode *tmp = new keynode;
 189   tmp->action = NULL;
 190   tmp->parent = _current;
 191   _current->children.push_back(tmp);
 192   _current = tmp;
 193 }
 194
 195 void keytree::retract()
 196 {
 197   if (_current != _head)
 198     _current = _current->parent;
 199 }
 200
 201 void keytree::setCurrentNodeProps(Action::ActionType action, unsigned int mask,
 202                                   string key, string arg)
 203 {
 204   if (_current->action)
 205     delete _current->action;
 206
 207   _current->action = new Action(action,
 208                                 XKeysymToKeycode(_display,
 209                                                  XStringToKeysym(key.c_str())),
 210                                 mask, arg);
 211 }
 212
 213 void keytree::initialize(void)
 214 {
 215   int tval = _epist->getConfig()->getNumberValue(Config::chainTimeout);
 216   _timer = new BTimer(_epist, this);
 217
 218   if (tval <= 0)
 219     tval = 3000; // set default timeout to 3 seconds
 220
 221   _timer->setTimeout(tval);
 222 }
 223
 224 void keytree::timeout(void)
 225 {
 226   assert(_timeout_screen != NULL);
 227
 228   if (_current != _head) {
 229     ungrabChildren(_current, _timeout_screen);
 230     _current = _head;
 231   }
 232   _timeout_screen = NULL;
 233 }