In SDL::Event I found this:

Window resize events

resize_w, resize_h

When SDL_RESIZABLE is passed as a flag to SDL_SetVideoMode the user is
+ 
allowed to resize the applications window. When the window is resized 
an SDL_VIDEORESIZE is reported, with the new window width and height 
values stored in the resize structure's resize_w and resize_h. When an
+ 
SDL_VIDEORESIZE is received the window should be resized to the new 
dimensions using SDL_SetVideoMode.

[download]

In your program it looks like you have everything except the last part where it says to use SDL_SetVideoMode.

I couldn't find any examples that use that but I did find an example included in SDL called examples/cookbook/1.pl that uses SDL::Video::set_video_mode(320, 320, 32, SDL_SWSURFACE );

The documentation for SDL::Video::set_video_mode() shows that function seems to be what you need:

SDL_RESIZABLE
Create a resizable window. When the window is resized by the user 
a SDL_VIDEORESIZE event is generated and SDL::Video::set_video_mode 
can be called again with the new size.

[download]

There are more details there on how to call SDL::Video::set_video_mode().

Your application looks interesting. Let us know how it works out. Good luck!

Update:

After looking at your application again and looking at the contents of App.pm I notice the resize() function you use calls SDL::Video::set_video_mode() so it seems like you've done it correctly. My comments above were not very helpful it seems.

In reply to Re^3: SDL/SDLx issue with application resizing by Lotus1
in thread SDL/SDLx issue with application resizing by Garden Dwarf

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