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Document gtk-rs specific patterns

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This is mostly taken and (slightly) adapted
from Chris' GNOME Image Viewer
https://gitlab.gnome.org/BrainBlasted/gnome-image-viewer
This commit is contained in:
Julian Hofer 2021-02-07 17:45:17 +01:00 • committed by Bilal Elmoussaoui
parent 5573bb8988
commit ac83040616
1 changed files with 26 additions and 0 deletions
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26
src/application.rs
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@ -14,6 +14,8 @@ mod imp {
use glib::{subclass, ParamSpec, WeakRef};
use std::cell::{Cell, RefCell};
// The basic struct that holds our state and widgets
// (Ref)Cells are used for members which need to be mutable
pub struct Application {
pub window: RefCell<Option<WeakRef<Window>>>,
pub model: ProvidersModel,
@ -22,6 +24,8 @@ mod imp {
pub can_be_locked: Cell<bool>,
pub settings: gio::Settings,
}
// Sets up the basics for the GObject
impl ObjectSubclass for Application {
const NAME: &'static str = "Application";
type ParentType = gtk::Application;
@ -30,8 +34,11 @@ mod imp {
type Instance = subclass::simple::InstanceStruct<Self>;
type Class = subclass::simple::ClassStruct<Self>;
// This macro implements some boilerplate code
// for the object setup, e.g. get_type()
glib::object_subclass!();
// Initialize with default values
fn new() -> Self {
let model = ProvidersModel::new();
let settings = gio::Settings::new(config::APP_ID);
@ -47,6 +54,7 @@ mod imp {
}
}
// Overrides GObject vfuncs
impl ObjectImpl for Application {
fn properties() -> &'static [ParamSpec] {
use once_cell::sync::Lazy;
@ -99,7 +107,11 @@ mod imp {
}
}
// This is empty, but we still need to provide an
// empty implementation for each type we subclass.
impl GtkApplicationImpl for Application {}
// Overrides GApplication vfuncs
impl ApplicationImpl for Application {
fn startup(&self, app: &Self::Type) {
self.parent_startup(app);
@ -118,6 +130,16 @@ mod imp {
theme.add_resource_path("/com/belmoussaoui/Authenticator/icons/");
}
// - action! is a macro from gtk_macros
// that creates a GSimpleAction with a callback.
//
// - clone! is a macro from glib-rs that allows
// you to easily handle references in callbacks
// without refcycles or leaks.
// When you don't want the callback to keep the
// Object alive, pass as @weak. Otherwise, pass
// as @strong. Most of the time you will want
// to use @weak.
action!(app, "quit", clone!(@weak app => move |_, _| app.quit()));
action!(
@ -252,6 +274,10 @@ mod imp {
}
}
// Creates a wrapper struct that inherits the functions
// from objects listed it @extends or interfaces it @implements.
// This is what allows us to do e.g. application.quit() on
// Application without casting.
glib::wrapper! {
pub struct Application(ObjectSubclass<imp::Application>)
@extends gio::Application, gtk::Application, gio::ActionMap;