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

   1 // -*- mode: C++; indent-tabs-mode: nil; -*-
   2 // keytree.cc for Epistophy - 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
  25 #include <string>
  26
  27 using std::string;
  28
  29
  30 keytree::keytree(Display *display) : _display(display)
  31 {
  32   _head = new keynode;
  33   _head->parent = NULL;
  34   _head->action = NULL; // head's action is always NULL
  35   _current = _head;
  36 }
  37
  38 keytree::~keytree()
  39 {
  40   clearTree(_head);
  41 }
  42
  43 void keytree::clearTree(keynode *node)
  44 {
  45   if (!node)
  46     return;
  47
  48   ChildList::iterator it, end = node->children.end();
  49   for (it = node->children.begin(); it != end; ++it)
  50     clearTree(*it);
  51
  52   if (node->action)
  53     delete node->action;
  54   delete node;
  55 }
  56
  57 void keytree::grabDefaults(screen *scr)
  58 {
  59   grabChildren(_head, scr);
  60 }
  61
  62 void keytree::grabChildren(keynode *node, screen *scr)
  63 {
  64   ChildList::const_iterator it, end = node->children.end();
  65   for (it = node->children.begin(); it != end; ++it)
  66     if ( (*it)->action )
  67       scr->grabKey( (*it)->action->keycode(), (*it)->action->modifierMask() );
  68 }
  69
  70 void keytree::ungrabChildren(keynode *node, screen *scr)
  71 {
  72   ChildList::const_iterator head_it, head_end = _head->children.end();
  73   ChildList::const_iterator it, end = node->children.end();
  74   bool ungrab = true;
  75
  76   // when ungrabbing children, make sure that we don't ungrab any topmost keys
  77   // (children of the head node) This would render those topmost keys useless.
  78   // Topmost keys are _never_ ungrabbed, since they are only grabbed at startup
  79
  80   for (it = node->children.begin(); it != end; ++it) {
  81     if ( (*it)->action ) {
  82       for (head_it = _head->children.begin(); head_it != head_end; ++head_it) {
  83         if ( (*it)->action->modifierMask() == (*head_it)->action->modifierMask() &&
  84              (*it)->action->keycode() == (*head_it)->action->keycode())
  85         {
  86           ungrab = false;
  87           break;
  88         }
  89       }
  90
  91       if (ungrab)
  92         scr->ungrabKey( (*it)->action->keycode(), (*it)->action->modifierMask());
  93
  94       ungrab = true;
  95     }
  96   }
  97 }
  98
  99 const Action * keytree::getAction(const XEvent &e, unsigned int state,
 100                                   screen *scr)
 101 {
 102   Action *act;
 103
 104   // we're done with the children. ungrab them
 105   if (_current != _head)
 106     ungrabChildren(_current, scr);
 107
 108   ChildList::const_iterator it, end = _current->children.end();
 109   for (it = _current->children.begin(); it != end; ++it) {
 110     act = (*it)->action;
 111     if (e.xkey.keycode == act->keycode() && state == act->modifierMask()) {
 112       if ( isLeaf(*it) ) {
 113         // node is a leaf, so an action will be executed
 114         _current = _head;
 115         return act;
 116       }
 117       else {
 118         // node is not a leaf, so we advance down the tree, and grab the
 119         // children of the new current node. no action is executed
 120         _current = *it;
 121         grabChildren(_current, scr);
 122         return (const Action *)NULL;
 123       }
 124     }
 125   }
 126
 127   // action not found. back to the head
 128   _current = _head;
 129   return (const Action *)NULL;
 130 }
 131
 132 void keytree::addAction(Action::ActionType action, unsigned int mask,
 133                         string key, string arg)
 134 {
 135   // can't grab non-modifier as topmost key
 136   // XXX: do we allow Esc to be grabbed at the top?
 137   if (_current == _head && (mask == 0 || mask == ShiftMask))
 138     return;
 139
 140   keynode *tmp = new keynode;
 141   tmp->action = new Action(action,
 142                            XKeysymToKeycode(_display,
 143                                             XStringToKeysym(key.c_str())),
 144                            mask, arg);
 145   tmp->parent = _current;
 146   _current->children.push_back(tmp);
 147 }
 148
 149 void keytree::advanceOnNewNode()
 150 {
 151   keynode *tmp = new keynode;
 152   tmp->action = NULL;
 153   tmp->parent = _current;
 154   _current->children.push_back(tmp);
 155   _current = tmp;
 156 }
 157
 158 void keytree::retract()
 159 {
 160   if (_current != _head)
 161     _current = _current->parent;
 162 }
 163
 164 void keytree::setCurrentNodeProps(Action::ActionType action, unsigned int mask,
 165                                   string key, string arg)
 166 {
 167   if (_current->action)
 168     delete _current->action;
 169
 170   _current->action = new Action(action,
 171                                 XKeysymToKeycode(_display,
 172                                                  XStringToKeysym(key.c_str())),
 173                                 mask, arg);
 174 }