4.4BSD/usr/src/contrib/emacs-18.57/oldXMenu/Activate.c
/* $Header: Activate.c,v 1.16 88/02/02 19:08:46 jim Exp $ */
/* Copyright Massachusetts Institute of Technology 1985 */
#include <X11/copyright.h>
/*
* XMenu: MIT Project Athena, X Window system menu package
*
* XMenuActivate - Maps a given menu to the display and activates
* the menu for user selection. The user is allowed to
* specify which pane and selection will be current,
* the X and Y location of the menu (relative to the
* parent window) and the mouse button event mask that
* will be used to identify a selection request.
*
* A menu selection is shown to be current by placing
* a highlight box around the selection as the mouse
* cursor enters its active region. Inactive selections
* will not be highlited. As the mouse cursor moved
* from one menu pane to another menu pane the pane being
* entered is raised and made current and the pane being
* left is lowered.
*
* Anytime XMenuActivate returns, the p_num and
* s_num are left at their last known values (i.e.,
* the last known current pane and selection indices).
* The following are the defined return states:
*
* 1) If at any time an error occurs the data
* pointer is left untouched and XM_FAILURE
* is returned.
*
* 2) When a selection request is recieved (i.e.,
* when the specified mouse event occurs) the
* data pointer will be set to the data
* associated with the particular selection
* current at the time of the selection request
* and XM_SUCCESS is returned.
*
* 3) If no selection was current at the time a
* selection request is made the data pointer
* will be left untouched and XM_NO_SELECT will
* be returned.
*
* 4) If the selection that was current at the time
* a selection request is made is not an active
* selection the data pointer will be left
* untouched and XM_IA_SELECT will be returned.
*
* Since X processes events in an asynchronous manner
* it is likely that XMenuActivate will encounter
* a "foreign event" while it is executing. Foreign
* events are handled in one of three ways:
*
* 1) The event is discarded. This is the default
* mode and requires no action on the part of the
* application.
*
* 2) The application has identified an asynchronous
* event handler that will be called and the
* foreign event handed off to it. Note:
* AEQ mode disables this mode temporarily.
*
* 3) The application has enabled asynchronous event
* queueing mode. In this mode all foreign events
* will be queued up untill XMenuActivate
* terminates; at which time they will be
* returned to the X event queue. As long as
* AEQ mode is enabled any asynchronous event
* handler as temporarily disabled.
*
* Any events encountered while taking down the menu
* (i.e., exposure events from occluded windows) will
* automatically be returned to the X event queue after
* XMenuActivate has cleaned the queue of any of its own
* events that are no longer needed.
*
* Author: Tony Della Fera, DEC
* March 12, 1986
*
*/
#include "XMenuInt.h"
int
XMenuActivate(display, menu, p_num, s_num, x_pos, y_pos, event_mask, data)
register Display *display; /* Display to put menu on. */
register XMenu *menu; /* Menu to activate. */
int *p_num; /* Pane number selected. */
int *s_num; /* Selection number selected. */
int x_pos; /* X coordinate of menu position. */
int y_pos; /* Y coordinate of menu position. */
unsigned int event_mask; /* Mouse button event mask. */
char **data; /* Pointer to return data value. */
{
int status; /* X routine call status. */
int orig_x; /* Upper left menu origin X coord. */
int orig_y; /* Upper left menu origin Y coord. */
int ret_val; /* Return value. */
register XMPane *p_ptr; /* Current XMPane. */
register XMPane *event_xmp; /* Event XMPane pointer. */
register XMPane *cur_p; /* Current pane. */
register XMSelect *cur_s; /* Current selection. */
XMWindow *event_xmw; /* Event XMWindow pointer. */
XEvent event; /* X input event. */
XEvent peek_event; /* X input peek ahead event. */
Bool selection = False; /* Selection has been made. */
Bool forward = True; /* Moving forward in the pane list. */
Window root, child;
int root_x, root_y, win_x, win_y;
unsigned int mask;
/*
* Define and allocate a foreign event queue to hold events
* that don't belong to XMenu. These events are later restored
* to the X event queue.
*/
typedef struct _xmeventque {
XEvent event;
struct _xmeventque *next;
} XMEventQue;
XMEventQue *feq = NULL; /* Foreign event queue. */
XMEventQue *feq_tmp; /* Foreign event queue temporary. */
/*
* If there are no panes in the menu then return failure
* because the menu is not initialized.
*/
if (menu->p_count == 0) {
_XMErrorCode = XME_NOT_INIT;
return(XM_FAILURE);
}
/*
* Find the desired current pane.
*/
cur_p = _XMGetPanePtr(menu, *p_num);
if (cur_p == NULL) {
return(XM_FAILURE);
}
cur_p->activated = cur_p->active;
/*
* Find the desired current selection.
* If the current selection index is out of range a null current selection
* will be assumed and the cursor will be placed in the current pane
* header.
*/
cur_s = _XMGetSelectionPtr(cur_p, *s_num);
/*
* Compute origin of menu so that cursor is in
* Correct pane and selection.
*/
_XMTransToOrigin(display,
menu,
cur_p, cur_s,
x_pos, y_pos,
&orig_x, &orig_y);
menu->x_pos = orig_x; /* Store X and Y coords of menu. */
menu->y_pos = orig_y;
if (XMenuRecompute(display, menu) == XM_FAILURE) {
return(XM_FAILURE);
}
/*
* Flush the window creation queue.
* This batches all window creates since lazy evaluation
* is more efficient than individual evaluation.
* This routine also does an XFlush().
*/
if (_XMWinQueFlush(display, menu, cur_p, cur_s) == _FAILURE) {
return(XM_FAILURE);
}
/*
* Make sure windows are in correct order (in case we were passed
* an already created menu in incorrect order.)
*/
for(p_ptr = menu->p_list->next; p_ptr != cur_p; p_ptr = p_ptr->next)
XRaiseWindow(display, p_ptr->window);
for(p_ptr = menu->p_list->prev; p_ptr != cur_p->prev; p_ptr = p_ptr->prev)
XRaiseWindow(display, p_ptr->window);
/*
* Make sure all selection windows are mapped.
*/
for (
p_ptr = menu->p_list->next;
p_ptr != menu->p_list;
p_ptr = p_ptr->next
){
XMapSubwindows(display, p_ptr->window);
}
/*
* Synchronize the X buffers and the event queue.
* From here on, all events in the queue that don't belong to
* XMenu are sent back to the application via an application
* provided event handler or discarded if the application has
* not provided an event handler.
*/
XSync(display, 0);
/*
* Grab the mouse for menu input.
*/
status = XGrabPointer(
display,
menu->parent,
True,
event_mask,
GrabModeAsync,
GrabModeAsync,
None,
menu->mouse_cursor,
CurrentTime
);
if (status == _X_FAILURE) {
_XMErrorCode = XME_GRAB_MOUSE;
return(XM_FAILURE);
}
/*
* Map the menu panes.
*/
XMapWindow(display, cur_p->window);
for (p_ptr = menu->p_list->next;
p_ptr != cur_p;
p_ptr = p_ptr->next)
XMapWindow(display, p_ptr->window);
for (p_ptr = cur_p->next;
p_ptr != menu->p_list;
p_ptr = p_ptr->next)
XMapWindow(display, p_ptr->window);
XRaiseWindow(display, cur_p->window); /* Make sure current */
/* pane is on top. */
cur_s = NULL; /* Clear current selection. */
/*
* Begin event processing loop.
*/
while (1) {
XNextEvent(display, &event); /* Get next event. */
switch (event.type) { /* Dispatch on the event type. */
case Expose:
event_xmp = (XMPane *)XLookUpAssoc(display,
menu->assoc_tab,
event.xexpose.window);
if (event_xmp == NULL) {
/*
* If AEQ mode is enabled then queue the event.
*/
if (menu->aeq) {
feq_tmp = (XMEventQue *)malloc(sizeof(XMEventQue));
if (feq_tmp == NULL) {
_XMErrorCode = XME_CALLOC;
return(XM_FAILURE);
}
feq_tmp->event = event;
feq_tmp->next = feq;
feq = feq_tmp;
}
else if (_XMEventHandler) (*_XMEventHandler)(&event);
break;
}
if (event_xmp->activated) {
XSetWindowBackground(display,
event_xmp->window,
menu->bkgnd_color);
}
else {
XSetWindowBackgroundPixmap(display,
event_xmp->window,
menu->inact_pixmap);
}
_XMRefreshPane(display, menu, event_xmp);
break;
case EnterNotify:
/*
* First wait a small period of time, and see
* if another EnterNotify event follows hard on the
* heels of this one. i.e., the user is simply
* "passing through". If so, ignore this one.
*/
event_xmw = (XMWindow *)XLookUpAssoc(display,
menu->assoc_tab,
event.xcrossing.window);
if (event_xmw == NULL) break;
if (event_xmw->type == SELECTION) {
/*
* We have entered a selection.
*/
/* if (XPending(display) == 0) usleep(150000); */
if (XPending(display) != 0) {
XPeekEvent(display, &peek_event);
if(peek_event.type == LeaveNotify) {
break;
}
}
cur_s = (XMSelect *)event_xmw;
/*
* If the pane we are in is active and the
* selection entered is active then activate
* the selection.
*/
if (cur_p->active && cur_s->active) {
cur_s->activated = 1;
_XMRefreshSelection(display, menu, cur_s);
}
}
else {
/*
* We have entered a pane.
*/
/* if (XPending(display) == 0) usleep(150000); */
if (XPending(display) != 0) {
XPeekEvent(display, &peek_event);
if (peek_event.type == EnterNotify) break;
}
XQueryPointer(display,
menu->parent,
&root, &child,
&root_x, &root_y,
&win_x, &win_y,
&mask);
event_xmp = (XMPane *)XLookUpAssoc(display,
menu->assoc_tab,
child);
if (event_xmp == NULL) break;
if (event_xmp == cur_p) break;
if (event_xmp->serial > cur_p->serial) forward = True;
else forward = False;
p_ptr = cur_p;
while (p_ptr != event_xmp) {
if (forward) p_ptr = p_ptr->next;
else p_ptr = p_ptr->prev;
XRaiseWindow(display, p_ptr->window);
}
if (cur_p->activated) {
cur_p->activated = False;
XSetWindowBackgroundPixmap(display,
cur_p->window,
menu->inact_pixmap);
_XMRefreshPane(display, menu, cur_p);
}
if (event_xmp->active) event_xmp->activated = True;
cur_p = event_xmp;
}
break;
case LeaveNotify:
event_xmw = (XMWindow *)XLookUpAssoc(
display,
menu->assoc_tab,
event.xcrossing.window
);
if (event_xmw == NULL) break;
if(cur_s == NULL) break;
/*
* If the current selection was activated then
* deactivate it.
*/
if (cur_s->activated) {
cur_s->activated = False;
_XMRefreshSelection(display, menu, cur_s);
}
cur_s = NULL;
break;
case ButtonPress:
case ButtonRelease:
*p_num = cur_p->serial;
/*
* Check to see if there is a current selecion.
*/
if (cur_s != NULL) {
/*
* Set the selection number to the current selection.
*/
*s_num = cur_s->serial;
/*
* If the current selection was activated then
* we have a valid selection otherwise we have
* an inactive selection.
*/
if (cur_s->activated) {
*data = cur_s->data;
ret_val = XM_SUCCESS;
}
else {
ret_val = XM_IA_SELECT;
}
}
else {
/*
* No selection was current.
*/
ret_val = XM_NO_SELECT;
}
selection = True;
break;
default:
/*
* If AEQ mode is enabled then queue the event.
*/
if (menu->aeq) {
feq_tmp = (XMEventQue *)malloc(sizeof(XMEventQue));
if (feq_tmp == NULL) {
_XMErrorCode = XME_CALLOC;
return(XM_FAILURE);
}
feq_tmp->event = event;
feq_tmp->next = feq;
feq = feq_tmp;
}
else if (_XMEventHandler) (*_XMEventHandler)(&event);
}
/*
* If a selection has been made, break out of the event loop.
*/
if (selection == True) break;
}
/*
* Unmap the menu.
*/
for ( p_ptr = menu->p_list->next;
p_ptr != menu->p_list;
p_ptr = p_ptr->next)
{
XUnmapWindow(display, p_ptr->window);
}
/*
* Ungrab the mouse.
*/
XUngrabPointer(display, CurrentTime);
/*
* Restore bits under where the menu was if we managed
* to save them and free the pixmap.
*/
/*
* If there is a current selection deactivate it.
*/
if (cur_s != NULL) cur_s->activated = 0;
/*
* Deactivate the current pane.
*/
cur_p->activated = 0;
XSetWindowBackgroundPixmap(display, cur_p->window, menu->inact_pixmap);
/*
* Synchronize the X buffers and the X event queue.
*/
XSync(display, 0);
/*
* Dispatch any events remaining on the queue.
*/
while (QLength(display)) {
/*
* Fetch the next event.
*/
XNextEvent(display, &event);
/*
* Discard any events left on the queue that belong to XMenu.
* All others are held and then returned to the event queue.
*/
switch (event.type) {
case Expose:
case EnterNotify:
case LeaveNotify:
case ButtonPress:
case ButtonRelease:
/*
* Does this event belong to one of XMenu's windows?
* If so, discard it and process the next event.
* If not fall through and treat it as a foreign event.
*/
event_xmp = (XMPane *)XLookUpAssoc(
display,
menu->assoc_tab,
event.xbutton.window
);
if (event_xmp != NULL) continue;
default:
/*
* This is a foreign event.
* Queue it for later return to the X event queue.
*/
feq_tmp = (XMEventQue *)malloc(sizeof(XMEventQue));
if (feq_tmp == NULL) {
_XMErrorCode = XME_CALLOC;
return(XM_FAILURE);
}
feq_tmp->event = event;
feq_tmp->next = feq;
feq = feq_tmp;
}
}
/*
* Return any foreign events that were queued to the X event queue.
*/
while (feq != NULL) {
feq_tmp = feq;
XPutBackEvent(display, &feq_tmp->event);
feq = feq_tmp->next;
free((char *)feq_tmp);
}
/*
* Return successfully.
*/
_XMErrorCode = XME_NO_ERROR;
return(ret_val);
}