glimmer 0.0.6

A tool for decorating i3/Sway focused windows
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use cairo::{RectangleInt, Region};
use glib::Sender;
use gtk::prelude::*;
use gtk::{Window, WindowType};
use std::collections::HashMap;

use crate::actors::glimmer_instance::Geometry;

const MAIN_WINDOW_TITLE: &str = "__GLIMMER_WINDOW__";

pub fn setup(styles_path: String) {
    let css_provider = gtk::CssProvider::new();
    let data = std::fs::read(styles_path).expect("Could not read css file!");
    css_provider
        .load_from_data(&data)
        .expect("Could not load css into GTK");

    let screen = gdk::Screen::default().unwrap();

    let _visual = screen
        .rgba_visual()
        .expect("No RGBA supported -- this utility makes no sense without it");

    gtk::StyleContext::add_provider_for_screen(&screen, &css_provider, 1);
}

pub fn update_window_position(window: &Window, geometry: Geometry) {
    let children = window.children();
    let fixed = children
        .first()
        .unwrap()
        .downcast_ref::<gtk::Fixed>()
        .unwrap();

    let fixed_children = fixed.children();
    let b = fixed_children
        .first()
        .unwrap()
        .downcast_ref::<gtk::Box>()
        .unwrap();

    b.set_size_request(geometry.width, geometry.height);

    window.resize(geometry.width, geometry.height);
    window.move_(geometry.x, geometry.y);
}

pub fn build_window(label_string: &str, geometry: Geometry) -> Window {
    let window = Window::new(WindowType::Popup);
    window.set_title(MAIN_WINDOW_TITLE);
    window.set_default_size(1, 1);
    window.set_can_focus(false);
    window.set_resizable(false);
    window.set_app_paintable(true);
    window.set_keep_above(true);

    window.connect_draw(|w, _c| {
        let rect: RectangleInt = RectangleInt {
            x: 0,
            y: 0,
            width: 0,
            height: 0,
        };
        let region: Region = Region::create_rectangle(&rect);

        w.window()
            .unwrap()
            .input_shape_combine_region(&region, 0, 0);

        gtk::Inhibit(false)
    });

    let container = gtk::FixedBuilder::new().name("container").build();
    let b = gtk::BoxBuilder::new().name("box").build();

    let label = gtk::LabelBuilder::new()
        .name("label")
        .label(label_string)
        .build();

    container.add(&b);
    container.add(&label);
    window.add(&container);

    update_window_position(&window, geometry);

    let screen = gdk::Screen::default().unwrap();
    let visual = screen
        .rgba_visual()
        .expect("No RGBA supported -- this utility makes no sense without it");

    window.set_visual(Some(&visual));
    window.show_all();

    container.style_context().add_class("animate");

    window
}

#[derive(Debug)]
pub struct WindowShim {
    pub id: usize,
    pub label: Option<String>,
    pub geometry: Geometry,
}

#[derive(Debug)]
pub enum Messages {
    Create(WindowShim),
    Update(WindowShim),
    Destroy(usize),
    None,
}

// TODO: remove me in favor of adding classes representing state
pub fn destroy_other_windows(windows: &mut HashMap<usize, Window>, selected_id: &usize) {
    let keys: Vec<usize> = windows.keys().cloned().collect();

    keys.iter()
        .filter(|&key| selected_id != key)
        .for_each(|key| windows.remove(&key).unwrap().close());
}

pub fn handle_messages() -> Sender<Messages> {
    let ctx = glib::MainContext::default();
    let _guard = ctx.acquire();

    let (sender, receiver) = glib::MainContext::channel::<Messages>(glib::PRIORITY_DEFAULT);
    let mut windows: HashMap<usize, Window> = HashMap::new();

    receiver.attach(None, move |msg| {
        match msg {
            Messages::Create(w) => {
                destroy_other_windows(&mut windows, &w.id);

                if let Some(old_window) = windows.insert(
                    w.id,
                    build_window(&w.label.unwrap_or_else(|| String::from("")), w.geometry),
                ) {
                    old_window.close();
                }
            }

            Messages::Update(w) => {
                if let Some(window) = windows.get(&w.id) {
                    update_window_position(&window, w.geometry);
                }
            }

            Messages::Destroy(id) => {
                if let Some(window) = windows.remove(&id) {
                    window.close();
                }
            }

            _ => {}
        }

        glib::Continue(true)
    });

    sender
}