glib | Unofficial glib clone for XChat Azure

I'm sure there's an easy way to do this but I don't know what it is. I have a very basic gtk::{Application, ApplicationWindow, DrawingArea}; setup. I want the DrawingArea::connect_draw closure to be triggered repeatedly on a timer, so it updates according to some changing state. (It would also be cool if it could be actively triggered by other threads, but a timer is fine.)

So far everything I've found that would work on a timer fails because it would mean moving the ApplicationWindow to another thread. (fails with NonNull cannot be shared between threads safely) What I have currently triggers redraw on generic events, so if I click my mouse on the window it will redraw, but not do so automatically.

That code is below, but please show me how to make this work?

The tutorials and examples for gtk-rs are honestly really incomplete and spotty, so I'm trying to piece together how to modify the application's state, as well as the state of some of the child elements, inside a button callback. So, in brief, I have:

I am working on (py)gtk4's drag-and-drop functionality and I hit a wall. I have a flowbox-derived class MediaGallery that contains frames with images and their filenames (class MediaFile), and a listbox-derived class Albums. I want to drag one or more selected images from MediaGallery to Albums, which will eventually add them to the underlying database.

Relevant piece of code:

I've developped Java application to make some litle web scraping tasks with Selenium. It work fine in my local environment with Windows 10 and both chrome / FireFox last versions with their appropriate driver path configured.

The thing is I need my application to be in a container to deploy it and I've got issues. I've created a Dockerfile based on Alpine, and installed what need to be installed (helped by some posts found on the internet). With the FireFox driver it's working almost fine for the first operations but some do not work the same as they do in my configuration in local and some even crash the client... That's why I've tried with chromium but I've got some issues with a connection to the browser not even working.

I've spent hours already on this and start thinking maybe I'm missing something, am I supposed to do that way by dowloading browsers and driver in my Dockerfile ?

For now I sucpect the versions of FireFox or the geckodriver associated not behaving the same as the one I've got on my machine and I can see the browser when It's working inside the container only logs I've added.

Dockerfile (for FireFox browser try) :

I'm trying to draw on a window with Gtkmm for C++, cairo::context, gdk::pixbuf. I've noticed that for some widths (in my example 298), instead of my image, I get some horizontal black lines (alternated with white stripes).

For other widths (in my example 300) I get a normal image. (I'm just drawing a yellow background in my example).

What am I doing wrong ? How can I obtain to draw correctly for any image width ?

I'm finding this behavior both on :

windows 10 / msys2 / gcc11.2 / std=c++20

opensuse 15.2 / gcc 11.2.1 / std=c++17

and on both I have library versions:

-I/usr/include/gtkmm-3.0 -L/usr/lib64 -I/usr/lib64/glibmm-2.4/include -I/usr/include/glibmm-2.4 -I/usr/lib64/glib-2.0/include -I/usr/include/glib-2.0 -I/usr/include/sigc++-2.0/ -I/usr/lib64/sigc++-2.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/lib64/pangomm-1.4/include -I/usr/include/gtk-3.0/ -I/usr/include/pango-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/cairomm-1.0 -I/usr/include/cairomm-1.0/cairomm -I/usr/lib64/cairomm-1.0/include -I/usr/include/freetype2 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/pangomm-1.4 -I/usr/include/harfbuzz -I/usr/include/atkmm-1.6 -I/usr/include/atk-1.0 -I/usr/lib64/atkmm-1.6/include -LC:/programs/msys64/mingw64/bin -lgtkmm-3.0 -lglibmm-2.4 -I/usr/include/sigc++-2.0 -lsigc-2.0 -lgdkmm-3.0 -latkmm-1.6 -lcairomm-1.0

Here's my code:

This is the method hiding:

I'm reading an open code in C which uses glib, and I found something like this

I'm trying to send a GLib.Notification from my application and pass a string parameter.

The name of the action is action-show-chat-view, and it is registered in the activate () method of my main application class:

I'm working on a gui app with cpp and gtkmm3. In this app, some widgets require the singleton pattern to implement such as window (because i want just one window in all over the app) this is my header file: