Re: Help on Gtk::Layout and Gtk::ScrolledWindow

On 2020-08-22 15:53, josephenry via gtkmm-list wrote:
> Hi,
>
> I am learning Gtk+ with gtkmm and my goal is to create a node based 
> interface for visual programming. I started a thread on the Gnome 
> discourse : 
> https://discourse.gnome.org/t/project-guidance-node-based-ui/ 
> <https://discourse.gnome.org/t/project-guidance-node-based-ui/4019>
>
> Basically what I want is to have my custom node widgets on a "canvas" 
> so I can be able to move them by dragging them. If anyone knows 
> Blender's node editor, it should also be possible to pan with middle 
> mouse button and also zoom.
>
> The Gtk::Layout component seems the right one when it comes to put 
> nodes at specific location on the interface. I also want to draw a 
> custom grid so this so the documentation seems adapted :
> /
> /
> /Infinite scrollable area containing child widgets and/or custom drawing./
>
> Now the "infinite scrollable area" concept interest me because I want 
> to be able to move on the node tree. The documentation says that I can 
> just put the layout into a Gtk::ScrolledWindow and it supports 
> scrolling natively.
>
Most of the documentation in gtkmm has been copied from GTK (formerly 
GTK+). The description of Gtk::Layout is more or less a copy of the 
documentation of GtkLayout. I don't understand why it's said that the 
scrollable area is infinite. As far as I know all widgets have finite 
size. The size can be large, much larger than a normal screen, but not 
infinite. I think you'd better ask the GTK people. They don't use gnome 
mailing lists any more. Their discussions have moved to discourse.gnome.org.

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