window: Add Home/End shortcuts for first/last img

This is the same as in EOG.
Also add PageUp/Down for image navigation from EOG.
Cleanup the navigation enums as well.

data/gtk/help_overlay.ui

@@ -102,6 +102,18 @@
                 <property name="accelerator">Right</property>
               </object>
             </child>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="title" translatable="yes" context="shortcut window">First Image</property>
+                <property name="action-name">win.first</property>
+              </object>
+            </child>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="title" translatable="yes" context="shortcut window">Last Image</property>
+                <property name="action-name">win.last</property>
+              </object>
+            </child>
           </object>
         </child>
         <child>

src/application.rs

@@ -180,8 +180,10 @@ impl LpApplication {
         self.set_accels_for_action("win.toggle-fullscreen", &["F11"]);
         self.set_accels_for_action("win.set-background", &["<Ctrl>F8"]);
 
-        self.set_accels_for_action("win.previous", &["Left"]);
-        self.set_accels_for_action("win.next", &["Right"]);
+        self.set_accels_for_action("win.previous", &["Left", "Page_Down"]);
+        self.set_accels_for_action("win.next", &["Right", "Page_Up"]);
+        self.set_accels_for_action("win.first", &["Home"]);
+        self.set_accels_for_action("win.last", &["End"]);
 
         self.set_accels_for_action("win.zoom-to(1.0)", &["1", "KP_1", "<Ctrl>1", "<Ctrl>KP_1"]);
         self.set_accels_for_action("win.zoom-to(2.0)", &["2", "KP_2", "<Ctrl>2", "<Ctrl>KP_2"]);

src/file_model.rs

@@ -207,6 +207,16 @@ impl LpFileModel {
             .collect()
     }
 
+    /// Return first path
+    pub fn first(&self) -> Option<PathBuf> {
+        self.imp().files.borrow().first().cloned()
+    }
+
+    /// Returns last path
+    pub fn last(&self) -> Option<PathBuf> {
+        self.imp().files.borrow().last().cloned()
+    }
+
     /// Currently sorts by name
     fn sort(files: &mut IndexSet<PathBuf>) {
         files.sort_by(|x, y| util::compare_by_name(x, y));

src/util.rs

@@ -123,3 +123,15 @@ pub async fn spawn<T: Debug + Send + 'static>(
         .spawn(async_global_executor::spawn_blocking(f))?
         .await)
 }
+
+#[derive(Debug, Clone, Copy)]
+pub enum Position {
+    First,
+    Last,
+}
+
+#[derive(Debug, Clone, Copy)]
+pub enum Direction {
+    Back,
+    Forward,
+}

src/widgets/image_view.rs

@@ -21,6 +21,7 @@ use crate::deps::*;
 use crate::file_model::LpFileModel;
 use crate::i18n::*;
 use crate::thumbnail::Thumbnail;
+use crate::util::{Direction, Position};
 use crate::widgets::{LpImage, LpImagePage, LpSlidingView};
 
 use adw::prelude::*;
@@ -270,12 +271,11 @@ impl LpImageView {
     }
 
     /// Move forward or backwards
-    pub fn navigate(&self, direction: adw::NavigationDirection) {
+    pub fn navigate(&self, direction: Direction) {
         if let Some(current_path) = self.current_path() {
             let new_path = match direction {
-                adw::NavigationDirection::Forward => self.model().after(&current_path),
-                adw::NavigationDirection::Back => self.model().before(&current_path),
-                _ => unimplemented!("Navigation direction should only be back or forward."),
+                Direction::Forward => self.model().after(&current_path),
+                Direction::Back => self.model().before(&current_path),
             };
 
             if let Some(new_path) = new_path {
@@ -284,6 +284,18 @@ impl LpImageView {
         }
     }
 
+    /// Jump to position
+    pub fn jump(&self, position: Position) {
+        let new_path = match position {
+            Position::First => self.model().first(),
+            Position::Last => self.model().last(),
+        };
+
+        if let Some(new_path) = new_path {
+            self.navigate_to_path(&new_path);
+        }
+    }
+
     /// Used for drag and drop
     fn navigate_to_path(&self, new_path: &Path) {
         let sliding_view = self.sliding_view();

src/window.rs

@@ -30,7 +30,7 @@ use std::cell::RefCell;
 use std::path::{Path, PathBuf};
 
 use crate::config;
-use crate::util;
+use crate::util::{self, Direction, Position};
 use crate::widgets::{LpImage, LpImagePage, LpImageView, LpPropertiesView};
 
 mod imp {
@@ -99,15 +99,19 @@ mod imp {
             });
 
             klass.install_action("win.next", None, move |win, _, _| {
-                win.imp()
-                    .image_view
-                    .navigate(adw::NavigationDirection::Forward);
+                win.imp().image_view.navigate(Direction::Forward);
             });
 
             klass.install_action("win.previous", None, move |win, _, _| {
-                win.imp()
-                    .image_view
-                    .navigate(adw::NavigationDirection::Back);
+                win.imp().image_view.navigate(Direction::Back);
+            });
+
+            klass.install_action("win.first", None, move |win, _, _| {
+                win.imp().image_view.jump(Position::First);
+            });
+
+            klass.install_action("win.last", None, move |win, _, _| {
+                win.imp().image_view.jump(Position::Last);
             });
 
             klass.install_action("win.zoom-out", None, move |win, _, _| {