XtCallCallbacks(3)

✨ XtCallCallbacks — process callbacks ✨

okay bestie, we're in XtCallCallbacks(3) territory, part of the XT FUNCTIONS crew 💖 this is the trio that runs your callback lists and checks whether they even exist. let's get into it 🫶

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🌸 NAME 🌸

XtCallCallbacks, XtCallCallbackList, XtHasCallbacks — process callbacks ✨

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🎀 SYNTAX 🎀

#include <X11/Intrinsic.h>

void XtCallCallbacks(Widget w, const char *callback_name, XtPointer call_data);

void XtCallCallbackList(Widget w, XtCallbackList callbacks, XtPointer call_data);

typedef enum {XtCallbackNoList, XtCallbackHasNone, XtCallbackHasSome}
XtCallbackStatus;

XtCallbackStatus XtHasCallbacks(Widget w, const char *callback_name);

like yes that's a lot of signatures but they're all cute and serving their own little purpose 💅

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🌈 ARGUMENTS 🌈

• callback_name — the callback list you wanna execute or check, specified by name. it's giving "which list, bestie?" 🎀
• call_data — a callback-list specific data value that gets passed to each and every callback procedure in the list. yes, all of them. no cap. ✨
• callbacks — the callback list that's about to get executed 🔥
• w — the widget. the main character. obviously. 👑

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💖 DESCRIPTION 💖

so, XtCallCallbacks calls each procedure that's registered in the specified widget's callback list. that's it, that's the whole vibe. it goes down the list and calls everybody. slay. 💅

then we have XtCallCallbackList — if callbacks is not NULL, it calls each of the callback procedures in the list, passing client data and call_data. ⚠️ but bestie, hear me: the callbacks parameter must specify the contents of a widget or object resource declared with representation type XtRCallback. that's not optional, that's the rules. 🫶

and finally XtHasCallbacks, the little detective of the group 🔍 it checks if the widget even has a callback list identified by callback_name:

• if the callback list does not exist, XtHasCallbacks returns XtCallbackNoList — it's giving nonexistent, ghosted, no list found 💀
• if the callback list exists but is empty, it returns XtCallbackHasNone — the list is there but it's just sitting there, empty, no thoughts, head empty 😭
• if the callback list exists and has at least one callback registered, it returns XtCallbackHasSome — okay periodt, we have callbacks, we are so back 🔥

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🦋 SEE ALSO 🦋

• XtAddCallback(3)
• X Toolkit Intrinsics - C Language Interface
• Xlib - C Language X Interface

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okay that's the whole page, you ate that 💖 this was X Version 11, libXt 1.3.1, and yes she's iconic, she's XtCallCallbacks(3), go call some callbacks bestie 🌟👑