Drag & drop a file onto a card?

[stam]

Hi all,

I'm sure this must be possible, but can't get it to work...

If I put the code below into the card script then nothing happens and I just get a cursor showing a circle with a line through it. If I put the same script into any control, eg a button, and drag a file onto the it, then I get the '+' sign and the expected action happens. In this simple example it just puts the file name of the dropped file into the message box:

Code: Select all

on dragEnter
    set the dragAction to "copy"
end dragEnter

on dragDrop
    put the dragData["files"]
    pass dragdrop
end dragDrop

Can this not work with a card rather than a control?

Many thanks
S.

[richmond62]

https://forums.livecode.com/viewtopic.php?f=5&t=37420

[stam]

Thank you Richmond.

you could have just said 'no' and spared be the effort of downloading a stack, examining it's card script while being subjected to painfully questionable images... My question was whether the card can take drag and drop directly (rather than me having to put some kind of receiving control on it).

the relevant card script starts with the comment:

Code: Select all

## Obviously a "naked" card does not accept any Drag'n'Drop, so I created an opaque gracic that will "catch" the droppings

That would have sufficed. And probably would have been less effort for you to dig up this URL...

Also - I wonder why this post didn't show up on any searches? I suspect the text content and imaging of the post pretty much ruled that out from relevant searches...

[richmond62]

Painfully questionable images?

Sorry, but something escapes me.

[stam]

Probably the reason the post was titled “drag act”.
My point being that the attempts to make the thread “humorous” were so extravagant that the post doesn’t even flag up on Google when searching for “livecode drag file onto card”.

Again, just a “no, a card does not receive the dragDrop message” would have been welcome.
I did specifically look in the documentation but did not see this information (admittedly I may well have missed it as am at work with limited time).

Thanks for answering in any case.
S.

[richmond62]

Obviously the answer, then, is to stop being a drag and get into the act . . .

https://lessons.livecode.com/m/4071/l/1 ... to-a-stack

[richmond62]

HOWEVER: Be Warned, this does NOT import the image, it merely displays it:
-

-
I put the code into the cardScript.

[richmond62]

https://livecode.fandom.com/wiki/Drag_and_drop

explains about other types of data other than images.

[stam]

Thanks Richmond,
I think we may be talking at crossed purposes. I have seen these links before when researching prior to posting, hence my code above.
In case I wasn't clear the question was if a 'bare naked card' can receive a drag/dropped file. Not where to put the script.
As you can deduce from my script, I'm merely trying to get the file name of a file dropped onto a card.

To illustrate the problem, see the screenshot that shows the cursor turning into a 'stop' sign (what the big red arrow is pointing at).
This does not happen if I have any kind of control to receive the dropped file (yes, with the script in the card) - but on a bare naked card it seems like a no-go:

Just wanting to confirm there is no way to drop directly onto a card without any visible or hidden controls to receive the drop and move on...

S.

[richmond62]

Definitely there is no way a bare card can receive a file.

BUT I am sure that a card can be prepped (in the cardScript) so that things can be dragged onto it.

For instance, an image thing might be created on the card when a picture file is dragged onto the card.

HOWEVER I have not found a way to create a drop target for an image in a cardScript.

[richmond62]

I do NOT understand why THIS in the messageBox works:

Code: Select all

create img "OLDMASTER"

BUT this, in the cardScript does NOT:

Code: Select all

on dragEnter
create img "OLDMASTER"
end dragEnter

[richmond62]

Unfortunately I have not got the time to try this out at the moment,
but I wonder if one could not have a create statement inside a dragDrop thing?

[stam]

Unfortunately I have not got the time to try this out at the moment,
but I wonder if one could not have a create statement inside a dragDrop thing?

No that doesn't seem to work - but that's fine.
It was just a slight inconsistency in LC, as cards will react to practically all other messages - with the exception of drag messages it seems...

There are many workarounds to this (creating an graphic with no opacity for example and filling the card with it - resizing automatically etc) but they seem messy and inconsistent with, say, mouse events, keydown/up events etc - I wonder if this may merit an enhancement request?

[jacque]

I do NOT understand why THIS in the messageBox works:

Code: Select all

create img "OLDMASTER"

BUT this, in the cardScript does NOT:

Code: Select all

on dragEnter
create img "OLDMASTER"
end dragEnter

Because drag messages aren't sent to a card. You wouldn't get a dragdrop message either.