MenuDef: Showing different options based on CVar?

[Caligari87]

Basically, I have a CVar which sets one of 4 modes (or disable).

Code: Select all

OptionMenu "Dark_Adjust" {
	Title "DarkDoomZ Settings"

	Option "Mode","ddz_mode","Nice_Modes"

	ifoption("ddz_mode" == 1) {    //line 31
		Option "Presets","ddz_levels", "Sub_Presets"
		Slider "Darken","ddz_subtract",-256,0,8,0
	}
	ifoption("ddz_mode" == 2) {
		Slider "Max Brightness","ddz_maxbright",0,256,8,0
	}
	ifoption("ddz_mode" == 3) {
		Slider "Black Level","ddz_blacklevel",0,256,8,0
	}
	ifoption("ddz_mode" == 3) {
		Slider "Darken Factor","ddz_divfactor",0,256,8,0
	}
	StaticText " "
	StaticText "Changes will be applied on menu close"
}

I want the sub-settings for each mode to be hidden unless that preset is selected, but the code above errors with

Code: Select all

Script error, ":menudef.txt" line 31:
Expected ')', got '=='.

What am I doing wrong? Is this even possible?

[Gez]

As the error message says, ifoption cannot evaluate an expression. It's extremely limited. What you want to do isn't possible, at least not with pure MENUDEF -- it might be possible with ZScript, perhaps.

[Nash]

There's no other way except making your own custom widget for this.

[Nevander]

I have to wonder why it can't be as simple as

Code: Select all

OptionMenu "Menu" {
	Title "Menu"

	ifcvar("cvar" == 1) {
		// stuff
	}
}

[Graf Zahl]

Because MENUDEF gets compiled into a static array and 'if...' is a compile time directive.

[Caligari87]

So what can IfOption evaluate? Is it just the hardcoded stuff from menudef.cpp? I can't get it to recognize even a bool cvar.

If it's all hardcoded, then the wiki page really needs to be updated, because I've been fighting with this for hours now and I'm really gonna be cheesed if that was all for naught.

[Rachael]

IfOption is executed when the mod is loaded (at compile-time) - and never again. The result of the menudef compiler is immutable - in that it cannot be changed until the next restart.

You can, however, make ZScript widgets, but how that is done I have no idea.

[Caligari87]

Okay, thank you. Will update the wiki page accordingly.

I thought it would be possible, based on the player config menu which pops open sliders if Custom color is selected, but as far as I can tell that must have been done in ZScript.

[Graf Zahl]

The point of 'ifoption' was to be able to handle all the existing in-game menus in one MENUDEF lump, not write different ones for each game. So the options are limited.