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tdeutils/klaptopdaemon/xautolock_diy.c

290 lines
7.5 KiB

/*****************************************************************************
*
* Authors: Michel Eyckmans (MCE) & Stefan De Troch (SDT)
*
* Content: This file is part of version 2.x of xautolock. It implements
* the stuff used when the program is not using a screen saver
* extension and thus has to use the good old "do it yourself"
* approach for detecting user activity.
*
* The basic idea is that we initially traverse the window tree,
* selecting SubstructureNotify on all windows and adding each
* window to a temporary list. About +- 30 seconds later, we
* scan this list, now asking for KeyPress events. The delay
* is needed in order to interfere as little as possible with
* the event propagation mechanism. Whenever a new window is
* created by an application, a similar process takes place.
*
* Please send bug reports etc. to eyckmans@imec.be.
*
* --------------------------------------------------------------------------
*
* Copyright 1990,1992-1999,2001-2002 by Stefan De Troch and Michel Eyckmans.
*
* Versions 2.0 and above of xautolock are available under version 2 of the
* GNU GPL. Earlier versions are available under other conditions. For more
* information, see the License file.
*
*****************************************************************************/
#include <X11/Xlib.h>
#include <stdlib.h>
#include <time.h>
#include "xautolock_c.h"
static void selectEvents (Window window, Bool substructureOnly);
/*
* Window queue management.
*/
typedef struct item
{
Window window;
time_t creationtime;
struct item* next;
} xautolock_anItem, *xautolock_item;
static struct
{
Display* display;
struct item* head;
struct item* tail;
} queue;
static void
addToQueue (Window window)
{
xautolock_item newItem = malloc(sizeof(xautolock_anItem));
newItem->window = window;
newItem->creationtime = time (0);
newItem->next = 0;
if (!queue.head) queue.head = newItem;
if ( queue.tail) queue.tail->next = newItem;
queue.tail = newItem;
}
static void
processQueue (time_t age)
{
if (queue.head)
{
time_t now = time (0);
xautolock_item current = queue.head;
while (current && current->creationtime + age < now)
{
selectEvents (current->window, False);
queue.head = current->next;
free (current);
current = queue.head;
}
if (!queue.head) queue.tail = 0;
}
}
/*
* Function for selecting all interesting events on a given
* (tree of) window(s).
*/
static void
selectEvents (Window window, Bool substructureOnly)
{
Window root; /* root window of the window */
Window parent; /* parent of the window */
Window* tqchildren; /* tqchildren of the window */
unsigned nofChildren = 0; /* number of tqchildren */
unsigned i; /* loop counter */
XWindowAttributes attribs; /* attributes of the window */
if( xautolock_ignoreWindow( window ))
return;
/*
* Start by querying the server about the root and parent windows.
*/
if (!XQueryTree (queue.display, window, &root, &parent,
&tqchildren, &nofChildren))
{
return;
}
if (nofChildren) (void) XFree ((char*) tqchildren);
/*
* Build the appropriate event mask. The basic idea is that we don't
* want to interfere with the normal event propagation mechanism if
* we don't have to.
*
* On the root window, we need to ask for both substructureNotify
* and KeyPress events. On all other windows, we always need
* substructureNotify, but only need Keypress if some other client
* also asked for them, or if they are not being propagated up the
* window tree.
*/
#if 0
if (substructureOnly)
{
(void) XSelectInput (queue.display, window, SubstructureNotifyMask);
}
else
{
if (parent == None) /* the *real* rootwindow */
{
attribs.all_event_masks =
attribs.do_not_propagate_mask = KeyPressMask;
}
else if (!XGetWindowAttributes (queue.display, window, &attribs))
#else
{
if (!XGetWindowAttributes (queue.display, window, &attribs))
#endif
{
return;
}
#if 0
(void) XSelectInput (queue.display, window,
SubstructureNotifyMask
| ( ( attribs.all_event_masks
| attribs.do_not_propagate_mask)
& KeyPressMask));
#else
{
int mask = SubstructureNotifyMask | attribs.your_event_mask;
if( !substructureOnly )
{
mask |= ( ( attribs.all_event_masks
| attribs.do_not_propagate_mask)
& KeyPressMask );
}
(void) XSelectInput (queue.display, window, mask );
}
#endif
}
/*
* Now ask for the list of tqchildren again, since it might have changed
* in between the last time and us selecting SubstructureNotifyMask.
*
* There is a (very small) chance that we might process a subtree twice:
* child windows that have been created after our XSelectinput() has
* been processed but before we get to the XQueryTree() bit will be
* in this situation. This is harmless. It could be avoided by using
* XGrabServer(), but that'd be an impolite thing to do, and since it
* isn't required...
*/
if (!XQueryTree (queue.display, window, &root, &parent,
&tqchildren, &nofChildren))
{
return;
}
/*
* Now do the same thing for all tqchildren.
*/
for (i = 0; i < nofChildren; ++i)
{
selectEvents (tqchildren[i], substructureOnly);
}
if (nofChildren) (void) XFree ((char*) tqchildren);
}
#if 0
/*
* Function for processing any events that have come in since
* last time. It is crucial that this function does not block
* in case nothing interesting happened.
*/
void
processEvents (void)
{
while (XPending (queue.display))
{
XEvent event;
if (XCheckMaskEvent (queue.display, SubstructureNotifyMask, &event))
{
if (event.type == CreateNotify)
{
addToQueue (event.xcreatewindow.window);
}
}
else
{
(void) XNextEvent (queue.display, &event);
}
/*
* Reset the triggers if and only if the event is a
* KeyPress event *and* was not generated by XSendEvent().
*/
if ( event.type == KeyPress
&& !event.xany.send_event)
{
resetTriggers ();
}
}
/*
* Check the window queue for entries that are older than
* CREATION_DELAY seconds.
*/
processQueue ((time_t) CREATION_DELAY);
}
#else
void xautolock_processEvent( XEvent* event )
{
if (event->type == CreateNotify)
{
addToQueue (event->xcreatewindow.window);
}
/*
* Reset the triggers if and only if the event is a
* KeyPress event *and* was not generated by XSendEvent().
*/
if ( event->type == KeyPress
&& !event->xany.send_event)
{
xautolock_resetTriggers ();
}
}
void xautolock_processQueue()
{
/*
* Check the window queue for entries that are older than
* CREATION_DELAY seconds.
*/
processQueue ((time_t) CREATION_DELAY);
}
#endif
/*
* Function for initialising the whole shebang.
*/
void
xautolock_initDiy (Display* d)
{
int s;
queue.display = d;
queue.tail = 0;
queue.head = 0;
for (s = -1; ++s < ScreenCount (d); )
{
Window root = RootWindowOfScreen (ScreenOfDisplay (d, s));
addToQueue (root);
#if 0
selectEvents (root, True);
#endif
}
}