Stephan , you said you cannot replace the last one in the video.��
I think you can have an easy solution: you should treat a pane that you are currently over - the one you are going to replace, so if you drag over something which is not placeholder,

then it should automatically be shifted and replaced by placeholder.

Cheers :)

On 29 September 2017 at 00:56, stephan <stephan@stack.nl> wrote:

On 28-09-17 21:07, Stephane Ducasse wrote:

For example why a BlElement cannot get
invisible and visible in addition to visibility: BlVisibility visible.

It can, and if we do that systematically we end up with a BlElement with a thousand methods. There are so many aspects that an element might need to handle. Handling children, layout, styling, drawing, fonts, events, visibility. Where should the border be?

One thing I noted is that in Bloc we don't have a way to decide where to add a dropped element in a parent that has a specified layout. In Morphic that is also a responsibility of the layout.

Stephan

Best regards,
Igor Stasenko.