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Diffstat (limited to 'kdesktop/xautolock_diy.c')
| -rw-r--r-- | kdesktop/xautolock_diy.c | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/kdesktop/xautolock_diy.c b/kdesktop/xautolock_diy.c new file mode 100644 index 000000000..b9df2f895 --- /dev/null +++ b/kdesktop/xautolock_diy.c @@ -0,0 +1,289 @@ +/***************************************************************************** + * + * 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* children; /* children of the window */ + unsigned nofChildren = 0; /* number of children */ + 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, + &children, &nofChildren)) + { + return; + } + + if (nofChildren) (void) XFree ((char*) children); + + /* + * 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 children 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, + &children, &nofChildren)) + { + return; + } + + /* + * Now do the same thing for all children. + */ + for (i = 0; i < nofChildren; ++i) + { + selectEvents (children[i], substructureOnly); + } + + if (nofChildren) (void) XFree ((char*) children); +} + +#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 + } +} |