New Cabbage widget opcodes

[rorywalsh]

@mjmogo

Making one call to hide/show everything is much more reliable than a bunch to hide and show and all of them… I’m pretty sure I’ll stick with creating them in Cabbage…

You can now use the parent() identifier to specify which widget is another’s widget’s parent, for example:

<Cabbage>
form caption("Untitled") size(400, 300), guiMode("queue"), colour(58, 110, 182), pluginId("def1")
button bounds(180, 30, 80, 40), channel("toggle"), value(1)
</Cabbage>
<CsoundSynthesizer>
<CsOptions>
-n -d -+rtmidi=NULL -M0 -m0d --midi-key=4 --midi-velocity-amp=5
</CsOptions>
<CsInstruments>

ksmps = 32
nchnls = 2
0dbfs = 1

instr 1
    cabbageCreate "image bounds(0, 0, 100, 100), channel(\"image1\")"
    cabbageCreate "rslider bounds(10, 10, 100, 100), channel(\"slider1\"), parent(\"image1\")"
    kToggle, kTrig cabbageGetValue "toggle"
    cabbageSet kTrig, "image1", "visible", kToggle
endin

We got this feature for free as parent() was already used by Cabbage, but until now it was only ever used internally. I’ve only tested briefly, but it seems to work nicely.