Dogcows Code - chaz/openbox/blob - src/XDisplay.cc

   1 // XDisplay.cc for Openbox
   2 // Copyright (c) 2002 - 2002 Ben Janens (ben at orodu.net)
   3 //
   4 // Permission is hereby granted, free of charge, to any person obtaining a
   5 // copy of this software and associated documentation files (the "Software"),
   6 // to deal in the Software without restriction, including without limitation
   7 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 // and/or sell copies of the Software, and to permit persons to whom the
   9 // Software is furnished to do so, subject to the following conditions:
  10 //
  11 // The above copyright notice and this permission notice shall be included in
  12 // all copies or substantial portions of the Software.
  13 //
  14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  19 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  20 // DEALINGS IN THE SOFTWARE.
  21
  22 #ifdef HAVE_CONFIG_H
  23 # include "../config.h"
  24 #endif
  25
  26 #ifdef HAVE_UNNISTD_H
  27 # include <unistd.h>
  28 #endif
  29
  30 #ifdef HAVE_FCNTL_H
  31 # include <fcntl.h>
  32 #endif
  33
  34 #ifdef SHAPE
  35 # include <X11/extensions/shape.h>
  36 #endif
  37
  38 #include "XDisplay.h"
  39 #include "XScreen.h"
  40 #include "Util.h"
  41 #include <iostream>
  42 #include <algorithm>
  43
  44 using std::cerr;
  45 using std::endl;
  46
  47 std::string XDisplay::_app_name;
  48 Window      XDisplay::_last_bad_window = None;
  49
  50 /*
  51  * X error handler to handle all X errors while the application is
  52  * running.
  53  */
  54 int XDisplay::XErrorHandler(Display *d, XErrorEvent *e) {
  55 #ifdef DEBUG
  56   char errtxt[128];
  57   XGetErrorText(d, e->error_code, errtxt, sizeof(errtxt)/sizeof(char));
  58   cerr << _app_name.c_str() << ": X error: " <<
  59     errtxt << "(" << e->error_code << ") opcodes " <<
  60     e->request_code << "/" << e->minor_code << endl;
  61   cerr.flags(std::ios_base::hex);
  62   cerr << "  resource 0x" << e->resourceid << endl;
  63   cerr.flags(std::ios_base::dec);
  64 #endif
  65
  66   if (e->error_code == BadWindow)
  67     _last_bad_window = e->resourceid;
  68
  69   return False;
  70 }
  71
  72
  73 XDisplay::XDisplay(const std::string &application_name, const char *dpyname) {
  74   _app_name = application_name;
  75   _grabs = 0;
  76   _hasshape = false;
  77
  78   _display = XOpenDisplay(dpyname);
  79   if (_display == NULL) {
  80     cerr << "Could not open display. Connection to X server failed.\n";
  81     ::exit(2);
  82   }
  83   if (-1 == fcntl(ConnectionNumber(_display), F_SETFD, 1)) {
  84     cerr << "Could not mark display connection as close-on-exec.\n";
  85     ::exit(2);
  86   }
  87   _name = XDisplayName(dpyname);
  88
  89   XSetErrorHandler(XErrorHandler);
  90
  91 #ifdef    SHAPE
  92   int waste;
  93   _hasshape = XShapeQueryExtension(_display, &_shape_event_base, &waste);
  94 #endif // SHAPE
  95
  96   const unsigned int scount = ScreenCount(_display);
  97   _screens.reserve(scount);
  98   for (unsigned int s = 0; s < scount; s++)
  99     _screens.push_back(new XScreen(this, s));
 100 }
 101
 102
 103 XDisplay::~XDisplay() {
 104   std::for_each(_screens.begin(), _screens.end(), PointerAssassin());
 105   XCloseDisplay(_display);
 106 }
 107
 108
 109 /*
 110  * Return information about a screen.
 111  */
 112 XScreen *XDisplay::screen(unsigned int s) const {
 113   ASSERT(s < _screens.size());
 114   return _screens[s];
 115 }
 116
 117
 118 /*
 119  * Grab the X server
 120  */
 121 void XDisplay::grab() {
 122   if (_grabs++ == 0)
 123     XGrabServer(_display);
 124 }
 125
 126
 127 /*
 128  * Release the X server from a grab
 129  */
 130 void XDisplay::ungrab() {
 131   if (--_grabs == 0)
 132     XUngrabServer(_display);
 133 }
 134
 135
 136 /*
 137  * Gets the next event on the queue from the X server.
 138  *
 139  * Returns: true if e contains a new event; false if there is no event to be
 140  *          returned.
 141  */
 142 bool XDisplay::nextEvent(XEvent &e) {
 143   if(!XPending(_display))
 144     return false;
 145   XNextEvent(_display, &e);
 146   if (_last_bad_window != None) {
 147     if (e.xany.window == _last_bad_window) {
 148       cerr << "XDisplay::nextEvent(): Removing event for bad window from " <<
 149         "event queue\n";
 150       return false;
 151     } else
 152       _last_bad_window = None;
 153   }
 154   return true;
 155 }