d_slider_proc(3)

💖 d_slider_proc(3) 💖

okay bestie, welcome to the Allegro manual — yes, the Allegro game programming library, and yes we're about to talk about sliders. sit down, grab a strawberry 🍓, this one's cute.

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✨ NAME ✨

d_slider_proc — it's a dialog procedure that implements a slider control object, and it lives in the Allegro game programming library. that's the whole vibe. 🎚️

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🌸 SYNOPSIS 🌸

#include <allegro.h>

int d_slider_proc(int msg, DIALOG *d, int c);

like, that's the signature. no cap. 💅

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🦋 DESCRIPTION 🦋

so. it's a slider control object. main character energy honestly. 🎀

here's the tea: this object holds a value in d2, and that value lives in the range from 0 to d1. periodt. so d1 is your ceiling and d2 is where you're currently at.

now, the orientation? that's a whole vibe check on its own:

• if h is greater than or equal to w, it displays as a vertical slider 🧍‍♀️
• otherwise, it displays as a horizontal slider 🛌

the dp field can contain an optional bitmap to use for the slider handle (the lil thing you drag, you know the one) ✨

and dp2 can contain an optional callback function — and this one's important, bestie — it gets called each time d2 changes. every. single. time. it's giving attentive.

that callback function should have this exact prototype, no improvising:

int function(void *dp3, int d2);

and here's the part where it gets iconic: the d_slider_proc object will return the value of the callback function. yes, the callback's return value is the return value. it's a whole chain. 👑

ngl, if you skip the callback, nothing breaks — it's optional — but then nobody gets notified when d2 moves and honestly that's a little sad. 🙈

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🔥 SEE ALSO 🔥

• exgui(3)
• exrgbhsv(3)

go read those too, iykyk. 📚

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and that's a wrap on the sliders, bestie!! this whole page is from Allegro version 4.4.3 — slay, iconic, no notes 💜💖✨🫶🎀🦋