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RandR: support RandRFunc for screen changes #525

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Jun 10, 2021
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RandR: support RandRFunc for screen changes #525

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11 changes: 11 additions & 0 deletions doc/fvwm3/fvwm3.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -445,6 +445,17 @@ output will be moved to the next active output (the output which
contains the mouse pointer). If the same output reappears, Fvwm will
move those windows back again.

In addition to specific *FvwmEvent* conditions which can be used to track a
monitor's change, there is a function called _RandRFunc_ which the user can
define to be run when a screen event occurs (such as
enabling/disabling/resolution change):

....
DestroyFunc RandRFunc
AddToFunc RandRFunc
+ I Exec exec xmessage "A screen changed"
....

== DESKTOP BEHAVIOUR

Because Fvwm has the capability to track outputs, Fvwm can be told how
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13 changes: 13 additions & 0 deletions fvwm/events.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1814,18 +1814,31 @@ void
monitor_emit_broadcast(void)
{
struct monitor *m;
const char *randrfunc = "RandRFunc";

TAILQ_FOREACH (m, &monitor_q, entry) {
if (m->emit & MONITOR_CHANGED) {
BroadcastName(MX_MONITOR_CHANGED, -1, -1, -1, m->si->name);
m->emit &= ~MONITOR_ALL;
m->flags &= ~MONITOR_CHANGED;

/* Run the RandRFunc in case a user has set it. */
execute_function_override_window(NULL, NULL, randrfunc,
0, NULL);
}
if (m->emit & MONITOR_ENABLED) {
BroadcastName(MX_MONITOR_ENABLED, -1, -1, -1, m->si->name);

/* Run the RandRFunc in case a user has set it. */
execute_function_override_window(NULL, NULL, randrfunc,
0, NULL);
}
if (m->emit & MONITOR_DISABLED) {
BroadcastName(MX_MONITOR_DISABLED, -1, -1, -1, m->si->name);

/* Run the RandRFunc in case a user has set it. */
execute_function_override_window(NULL, NULL, randrfunc,
0, NULL);
}
}
}
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