epist now based on the BaseDisplay.

has the ability to be multiscreen!

1 files changed, 240 insertions, 0 deletions

diff --git a/util/epist/screen.cc b/util/epist/screen.cc
new file mode 100644
index 00000000..ad2b1772
--- /dev/null
+++ b/util/epist/screen.cc
@@ -0,0 +1,240 @@
+// -*- mode: C++; indent-tabs-mode: nil; -*-
+// screen.cc for Epistory - a key handler for NETWM/EWMH window managers.
+// Copyright (c) 2002 - 2002 Ben Jansens <ben at orodu.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+#ifdef    HAVE_CONFIG_H
+#  include "../../config.h"
+#endif // HAVE_CONFIG_H
+
+extern "C" {
+#ifdef    HAVE_UNISTD_H
+#  include <sys/types.h>
+#  include <unistd.h>
+#endif // HAVE_UNISTD_H
+}
+
+#include <iostream>
+#include <string>
+
+using std::cout;
+using std::endl;
+using std::hex;
+using std::dec;
+using std::string;
+
+#include "../../src/XAtom.hh"
+#include "screen.hh"
+#include "epist.hh"
+
+
+screen::screen(epist *epist, int number) {
+  _epist = epist;
+  _xatom = _epist->xatom();
+  _number = number;
+  _active = _clients.end();
+  _root = RootWindow(_epist->getXDisplay(), _number);
+  
+  // find a window manager supporting NETWM, waiting for it to load if we must
+  int count = 20;  // try for 20 seconds
+  _managed = false;
+  while (! (_epist->doShutdown() || _managed || count <= 0)) {
+    if (! (_managed = findSupportingWM()))
+      usleep(1000);
+    --count;
+  }
+  if (_managed)
+    cout << "Found compatible window manager '" << _wm_name << "' for screen "
+      << _number << ".\n";
+  else {
+    cout << "Unable to find a compatible window manager for screen " <<
+      _number << ".\n";
+    return;
+  }
+ 
+  XSelectInput(_epist->getXDisplay(), _root, PropertyChangeMask);
+    
+  updateClientList();
+  updateActiveWindow();
+}
+
+
+screen::~screen() {
+  if (_managed)
+    XSelectInput(_epist->getXDisplay(), _root, None);
+}
+
+
+bool screen::findSupportingWM() {
+  Window support_win;
+  if (! _xatom->getValue(_root, XAtom::net_supporting_wm_check, XAtom::window,
+                         support_win) || support_win == None)
+    return false;
+
+  string title;
+  _xatom->getValue(support_win, XAtom::net_wm_name, XAtom::utf8, title);
+  _wm_name = title;
+  return true;
+}
+
+
+XWindow *screen::findWindow(const XEvent &e) const {
+  assert(_managed);
+
+  WindowList::const_iterator it, end = _clients.end();
+  for (it = _clients.begin(); it != end; ++it)
+    if (**it == e.xany.window)
+      break;
+  if(it == end)
+    return 0;
+  return *it;
+}
+
+
+void screen::processEvent(const XEvent &e) {
+  assert(_managed);
+  assert(e.xany.window == _root);
+
+  XWindow *window = 0;
+  if (e.xany.window != _root) {
+    window = findWindow(e);  // find the window
+    assert(window); // we caught an event for a window we don't know about!?
+  }
+
+  switch (e.type) {
+  case PropertyNotify:
+    // root window
+    if (e.xproperty.atom == _xatom->getAtom(XAtom::net_active_window))
+      updateActiveWindow();
+    if (e.xproperty.atom == _xatom->getAtom(XAtom::net_client_list)) {
+      // catch any window unmaps first
+      XEvent ev;
+      if (XCheckTypedWindowEvent(_epist->getXDisplay(), e.xany.window,
+                                 DestroyNotify, &ev) ||
+          XCheckTypedWindowEvent(_epist->getXDisplay(), e.xany.window,
+                                 UnmapNotify, &ev)) {
+        processEvent(ev);
+      }
+
+      updateClientList();
+    }
+    break;
+  case KeyPress:
+    break;
+  }
+}
+
+
+// do we want to add this window to our list?
+bool screen::doAddWindow(Window window) const {
+  assert(_managed);
+
+  Atom type;
+  if (! _xatom->getValue(window, XAtom::net_wm_window_type, XAtom::atom,
+                         type))
+    return True;
+
+  if (type == _xatom->getAtom(XAtom::net_wm_window_type_dock) ||
+      type == _xatom->getAtom(XAtom::net_wm_window_type_menu))
+    return False;
+
+  return True;
+}
+
+
+void screen::updateClientList() {
+  assert(_managed);
+
+  WindowList::iterator insert_point = _active;
+  if (insert_point != _clients.end())
+    ++insert_point; // get to the item client the focused client
+  
+  // get the client list from the root window
+  Window *rootclients = 0;
+  unsigned long num = (unsigned) -1;
+  if (! _xatom->getValue(_root, XAtom::net_client_list, XAtom::window, num,
+                         &rootclients)) {
+    while (! _clients.empty()) {
+      delete _clients.front();
+      _clients.erase(_clients.begin());
+    }
+    if (rootclients) delete [] rootclients;
+    return;
+  }
+  
+  WindowList::iterator it, end = _clients.end();
+  unsigned long i;
+  
+  // insert new clients after the active window
+  for (i = 0; i < num; ++i) {
+    for (it = _clients.begin(); it != end; ++it)
+      if (**it == rootclients[i])
+        break;
+    if (it == end) {  // didn't already exist
+      if (doAddWindow(rootclients[i])) {
+        cout << "Added window: 0x" << hex << rootclients[i] << dec << endl;
+        _clients.insert(insert_point, new XWindow(_epist, rootclients[i]));
+      }
+    }
+  }
+
+  // remove clients that no longer exist
+  for (it = _clients.begin(); it != end;) {
+    WindowList::iterator it2 = it++;
+    for (i = 0; i < num; ++i)
+      if (**it2 == rootclients[i])
+        break;
+    if (i == num)  { // no longer exists
+      cout << "Removed window: 0x" << hex << (*it2)->window() << dec << endl;
+      delete *it2;
+      _clients.erase(it2);
+    }
+  }
+
+  if (rootclients) delete [] rootclients;
+}
+
+
+void screen::updateActiveWindow() {
+  assert(_managed);
+
+  Window a = None;
+  _xatom->getValue(_root, XAtom::net_active_window, XAtom::window, a);
+  
+  WindowList::iterator it, end = _clients.end();
+  for (it = _clients.begin(); it != end; ++it) {
+    if (**it == a)
+      break;
+  }
+  _active = it;
+
+  cout << "Active window is now: ";
+  if (_active == _clients.end()) cout << "None\n";
+  else cout << "0x" << hex << (*_active)->window() << dec << endl;
+}
+
+/*
+ * use this when execing a command to have it on the right screen
+      string dtmp = (string)"DISPLAY=" + display_name;
+      if (putenv(const_cast<char*>(dtmp.c_str()))) {
+        cout << "warning: couldn't set environment variable 'DISPLAY'\n";
+        perror("putenv()");
+      }
+ */