Use monospace fonts for color entries.

This also refactor few import abuses from me.
and mark the contrast ratio as translatable
"

src/application.rs

-use crate::colour;
-use crate::config;
-use crate::styles::update_styles;
-use crate::window::Window;
+use super::colour;
+use super::config;
+use super::styles::update_styles;
+use super::window::Window;
 use gio::prelude::*;
 use gtk::prelude::*;
 use std::env;

src/colour_entry.rs

-use crate::colour;
-use crate::colour_popover::ColourPopover;
-use crate::dbus::{BusType, Connection, Message};
-use crate::gtk::{BoxExt, ButtonExt, ColorChooserExt, ColorChooserWidgetExt, EntryExt, PopoverExt, StyleContextExt, WidgetExt};
+use super::colour;
+use super::colour_popover::ColourPopover;
+use dbus::{BusType, Connection, Message};
+use gtk::prelude::*;
 use std::collections::HashMap;
 use std::str::FromStr;
 
@@ -25,7 +25,7 @@ impl ColourEntry {
     fn init(&self, label: String) {
         self.widget.set_halign(gtk::Align::Center);
         self.widget.set_valign(gtk::Align::Center);
-        self.widget.get_style_context().add_class("linked");
+        self.widget.get_style_context().add_class(&gtk::STYLE_CLASS_LINKED);
         self.widget.set_hexpand(true);
         self.widget.set_tooltip_text(Some(&label));
 
@@ -35,7 +35,8 @@ impl ColourEntry {
         self.entry.set_property_primary_icon_name(Some("circle-symbolic"));
         self.entry.set_property_primary_icon_activatable(true);
         self.entry.get_style_context().add_class("colour-entry");
-        self.entry.set_width_chars(9);
+        self.entry.get_style_context().add_class(&gtk::STYLE_CLASS_MONOSPACE);
+        self.entry.set_width_chars(10);
         self.entry.show();
 
         let colour_selector_popover = ColourPopover::new(self.entry.clone());

src/contrast_level.rs

 use gettextrs::gettext;
 use glib::Cast;
-use gtk::{BoxExt, ContainerExt, LabelExt, OverlayExt, StyleContextExt, WidgetExt};
-use libhandy::{Column, ColumnExt};
+use gtk::prelude::*;
+use libhandy::prelude::*;
 use pango;
 use pangocairo;
 use std::{cell::RefCell, rc::Rc};
@@ -12,7 +12,7 @@ struct ChartBarMarker {
 }
 
 struct ChartBarWidget {
-    pub widget: Column,
+    pub widget: libhandy::Column,
     max_value: f64,
     value: f64,
     container: gtk::Box,
@@ -22,7 +22,7 @@ struct ChartBarWidget {
 
 impl ChartBarWidget {
     pub fn new(max_value: f64) -> Rc<RefCell<Self>> {
-        let widget = Column::new();;
+        let widget = libhandy::Column::new();;
         let chart_bar = Rc::new(RefCell::new(ChartBarWidget {
             widget,
             max_value: max_value.log(10.0),
@@ -181,12 +181,12 @@ impl ContrastLevelBar {
 
     pub fn set_contrast_level(&mut self, contrast_level: f64) {
         self.chartbar.borrow_mut().set_value(contrast_level);
-        println!("fract {}", contrast_level.fract());
-        let mut level_label = String::new();
+
+        let mut level_label = String::from(gettext("Contrast Ratio: "));
         if contrast_level.fract() != 0.0 {
-            level_label.push_str(&gettext(format!("Contrast Ratio: {:.1}:1", contrast_level)));
+            level_label.push_str(&format!("{:.1}:1", contrast_level));
         } else {
-            level_label.push_str(&gettext(format!("Contrast Ratio: {:}:1", contrast_level as i32)));
+            level_label.push_str(&format!("{:}:1", contrast_level as i32));
         }
         self.level_label.set_text(&level_label);
     }

src/contrast_preview.rs

-use crate::gtk::{BoxExt, LabelExt, StyleContextExt, WidgetExt};
 use gettextrs::gettext;
+use gtk::prelude::*;
 
 pub struct ContrastPreview {
     pub widget: gtk::Box,

src/main.rs

@@ -2,15 +2,7 @@ extern crate pretty_env_logger;
 #[macro_use]
 extern crate log;
 
-extern crate dbus;
-extern crate gio;
-extern crate glib;
 extern crate gtk;
-extern crate libhandy;
-extern crate pango;
-extern crate pangocairo;
-extern crate rand;
-
 use gettextrs::*;
 
 mod application;

src/window.rs

-use crate::application::Message;
-use crate::colour_entry::ColourEntry;
-use crate::config::{APP_ID, PROFILE};
-use crate::contrast_level::ContrastLevelBar;
-use crate::contrast_preview::ContrastPreview;
-use crate::libhandy::HeaderBarExt;
-use crate::window_state::WindowState;
+use super::application::Message;
+use super::colour_entry::ColourEntry;
+use super::config::{APP_ID, PROFILE};
+use super::contrast_level::ContrastLevelBar;
+use super::contrast_preview::ContrastPreview;
+use super::window_state::WindowState;
+
 use gettextrs::gettext;
 use glib::ObjectExt;
-use gtk::prelude::{BoxExt, BuilderExtManual, ButtonExt, ContainerExt, EditableSignals, MenuButtonExt, StyleContextExt, WidgetExt};
-use gtk::Inhibit;
-use std::cell::RefCell;
-use std::rc::Rc;
+use gtk::prelude::*;
+use libhandy::prelude::*;
+use std::{cell::RefCell, rc::Rc};
 
 pub struct Window {
     pub widget: gtk::ApplicationWindow,
@@ -77,7 +76,7 @@ impl Window {
         let state = self.state.clone();
         self.widget.connect_delete_event(move |window, _| {
             state.borrow_mut().dump(&window);
-            Inhibit(false)
+            gtk::Inhibit(false)
         });
 
         self.widget.show();

src/window_state.rs

-use crate::colour;
-use crate::colour_entry::ColourEntry;
-use crate::rand::Rng;
+use super::colour;
+use super::colour_entry::ColourEntry;
 use gio::prelude::SettingsExt;
 use gtk::prelude::GtkWindowExt;
+use rand::Rng;
 use std::str::FromStr;
 
 // Default colors, randomized whenever you launch the app