Dropobject working only with iamgewell

Targets macOS
1

New project: one window containg a canvas and an imagewell + pict filetypes

In the canvas and in the imageWell open event handler I have:
me.AcceptFileDrop SupportedImageFormats.all

and In the canvas and in the imageWell dropobject event handler I have
If Obj.PictureAvailable Then
me.Backdrop = obj.Picture
end if

and

If Obj.PictureAvailable Then
me.image = obj.Picture
end if

But while dropping a .png picturefile into the imagewell works, dropping the same file into the canvas does not work.

Tried removing the imagewell and leaving only the canvas: it still doesn’t work.
And of course, I cannot have it work in existing projects.

BTW: I cannot have it work even dropping onto a window…

Suggestions welcome. Thanks.

Xojo 2021r2.1 and Xojo 2024r2.4
Last Sonoma

2

This is when you drop an image from a software. For File drop, Use Obj.FolderItemAvailable instead.

It tooks me sometimes to understand why it does not works here !

If Obj.FolderItemAvailable Then
  me.Backdrop = obj.Picture
end if

Nothing else to change.

3

Done it: in the debugger now I see that Obj.FolderItemAvailable is executed and the next line “me.Backdrop = obj.Picture” too is executed; yet no picture shows up in the canvas.
Thanks for answering.

4

Needs a .Refresh ?

5

No it doesn’t

Did a quick test in the DropObject Canvas event with:

If obj.FolderItemAvailable Then
  Var p As New FolderItem(obj.FolderItem.NativePath)
  If p <> Nil Then
    Me.backdrop = Picture.Open(p)
  End If
End If

Don’t forget to put in the Canvas opening event also:

Me.AcceptFileDrop("image/png")
Me.AcceptFileDrop("image/jpeg")
Me.AcceptFileDrop("image/tiff")

Though interestingly this accepts then also .svg files (o;

6

I used:


Sub Open()
Var pngType As New FileType pngType.Name = "image/png" pngType.Extensions = ".png"

// Enable Drop an File above the Canvas

Canvas1.AcceptFileDrop(pngType)

End Sub
7

Still doesn’t explain when you just enable PNG file drops, it allows to drop every picture format and shows it.

8

It worked, so was the answer to OP.

To restrain the non wanted file types, you have to check them in the DropObject Event.

That had changed to this some years ago.

9

Sorry Emile, here it did not work, while Richard snipped worked.

But why does an imageWell work straight away?
If Obj.PictureAvailable Then
me.image = obj.Picture
end if

10

Try to drop a text (or bin or whatever is not an image file) onto your canvas / ImageWell and see what happens…

Remember: standard users are capable of eveything even dropping a text file onto a Canvas… :frowning: or :wink: depends on your code.