Lua Scripting with REAPER 5 - Part. 8: Using Native Actions

Source Article and Exercice:
http://extremraym.com/en/reascript-video-using-native-actions

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Cheers !

Hi, this is X-Raym, for the 8th part
of our ReaScript tutorial.

Today, we will use a REAPER
native action inside our script.

I will make this script select items
on which it has an effect.

The function is the following.

Here I need an item, and my items
are put in the variable item

and for bolean selected, I put
either true or false, so I put true

As I want my item to be selected
if they pass through here.

If I run the script...

we see that the items get selected.

However, the previous ones
didn't get unselected.

There is several way we can make it,

but I'll show you one, that will
make you learn something new.

We can run inside a script
actions coming from the actions list

If we now their command ID.

So, I will search for the action

Unselect all items.

I copy its ID.

And I will paste it temporary...

either here or here, it would have
the same result.

So I put here here. Temporary.

And I will look for the function called
Main_OnCommand

which allow me to run
a REAPER action, within the script.

As first parameter, the command ID
of the action

as 2nd parameters, I put 0.

A bit complicated to explain but most
of the time, 0 will be just fine.

I select all.

If I run the script, we see that the item
in time selection get selected.

If I extend the time selection...

Inside the time selection
and on selected track!

If I unselect this track...

and I run the script again...

This item get unselected.

In the next episode, we will see how to prevent
errors that may be caused by our script.