XtAppAddActionHook(3)

✨ XtAppAddActionHook — the "register an action hook procedure" era ✨

ok so bestie, welcome to the XT FUNCTIONS corner of the libXt 1.3.1 cinematic universe 💅 this is where you get to sneak a lil procedure in that runs right before every single action routine fires. it's giving backstage pass energy, fr fr 🎀

---

🌸 NAME 🌸

XtAppAddActionHook, XtRemoveActionHook — register an action hook procedure 🫶

---

🦋 SYNTAX 🦋

#include <X11/Intrinsic.h>

XtActionHookId XtAppAddActionHook(XtAppContext app_context,
       XtActionHookProc proc, XtPointer client_data);

void XtRemoveActionHook(XtActionHookId id);

like yes, that's the whole vibe. two functions, one header, no notes 👑

---

💖 ARGUMENTS 💖

• app_context — specifies the application context. that's the lil world your hooks live in 🌍
• proc — specifies the action hook procedure. the main character of this whole thing ⭐
• num_args — specifies the application-specific data to be passed to the action hook. yes bestie, that's literally what it says 🍓

ngl, the manpage lists num_args here while the syntax shows client_data, and I am simply reporting what I see. no cap, I don't make the rules 🙈

---

💅 DESCRIPTION 💅

XtAppAddActionHook adds the specified procedure to the front of a list maintained in the application context. so it's not joining the queue, it's cutting the queue. main character behavior, honestly 👑

in the future, when an action routine is about to be invoked for any widget in this application context — whether it's through the translation manager or via XtCallActionProc — the action hook procedures will be called in reverse order of registration, just prior to invoking the action routine. so the newest one goes first. LIFO but make it dramatic ✨

action hook procedures are removed automatically, and the XtActionHookIds get destroyed, when the application context in which they were added is destroyed. so like… they don't ghost you, they go down with the ship 🫡

XtRemoveActionHook removes the specified action hook procedure from the list in which it was registered. manual cleanup, for when you're done with that era of your life 🧹

---

🔥 SEE ALSO 🔥

• X Toolkit Intrinsics - C Language Interface
• Xlib - C Language X Interface

---

⚠️ heads up bestie: nothing here is dangerous, but do keep in mind the auto-cleanup only happens when the application context is destroyed — and the hooks run in reverse order of registration, so don't be surprised when the last one you added speaks first 💀

---

ok that's the whole page, you ate it, no crumbs 💖 this was X Version 11, libXt 1.3.1, XtAppAddActionHook(3) — catch you in the next manpage, mwah 🎀✨