Chapter 30. Recommended Techniques

# Chapter 30. Recommended Techniques

This section is simply a gathering of wisdom, general style guidelines and hints for creating gtkmm applications.

Use Meson! It is your friend :) It examines C and C++ files, determines how they depend on each other, and generates `build.ninja` or an equivalent file so the files can be compiled in the correct order. Meson permits automatic configuration of software installation, handling a large number of system quirks to increase portability.

Subclass Widgets to better organize your code. You should probably subclass your main `Window` at least. Then you can make your child Widgets and signal handlers members of that class.

Create your own signals instead of passing pointers around. Objects can communicate with each other via signals and signal handlers. This is much simpler than objects holding pointers to each other and calling each other's methods. gtkmm's classes use special versions of `sigc::signal`, but you should use normal `sigc::signal`s, as described in the libsigc++ documentation.

## Application Lifetime

Most applications will have only one `Window`, or only one main window. These applications can use `Gtk::Application::make_window_and_run(int argc, char** argv, T_Args&&... args)`. It creates and shows a window. When the window is closed, `make_window_and_run()` deletes the window and returns to the caller. This might happen when the user closes the window, or when your code decides to close the window with `Gtk::Window::close()`. You can prevent the user from closing the window (for instance, if there are unsaved changes) by overriding `Gtk::Window::on_close_request()`.

Most of our examples use this technique.

Example |  | Using a gtkmm widget