Add medium preview screen

musicus/res/ui/medium_preview.ui

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <requires lib="libadwaita" version="1.0"/>
+  <object class="GtkBox" id="widget">
+    <property name="orientation">vertical</property>
+    <child>
+      <object class="AdwHeaderBar">
+        <property name="show-start-title-buttons">false</property>
+        <property name="show-end-title-buttons">false</property>
+        <property name="title-widget">
+          <object class="AdwWindowTitle" id="window_title">
+            <property name="title" translatable="yes">Preview</property>
+          </object>
+        </property>
+        <child>
+          <object class="GtkButton" id="back_button">
+            <property name="icon-name">go-previous-symbolic</property>
+          </object>
+        </child>
+      </object>
+    </child>
+    <child>
+      <object class="GtkScrolledWindow">
+        <property name="vexpand">True</property>
+        <child>
+          <object class="AdwClamp">
+            <child>
+              <object class="GtkBox" id="medium_box">
+                <property name="margin-start">6</property>
+                <property name="margin-end">6</property>
+                <property name="margin-bottom">6</property>
+                <property name="orientation">vertical</property>
+                <child>
+                  <object class="GtkLabel" id="name_label">
+                    <property name="halign">start</property>
+                    <property name="margin-top">12</property>
+                    <property name="margin-bottom">6</property>
+                    <attributes>
+                      <attribute name="weight" value="bold"/>
+                    </attributes>
+                  </object>
+                </child>
+              </object>
+            </child>
+          </object>
+        </child>
+      </object>
+    </child>
+  </object>
+</interface>

musicus/src/import/import_screen.rs

@@ -78,7 +78,10 @@ impl ImportScreen {
                 .build();
 
             row.connect_activated(clone!(@weak this => move |_| {
-                debug!("Medium selected: {}", medium.name);
+                let medium = medium.clone();
+                spawn!(@clone this, async move {
+                    push!(this.handle, MediumPreview, (this.session.clone(), medium.clone())).await;
+                });
             }));
 
             this.matching_list.append(&row);

musicus/src/import/medium_preview.rs

@@ -0,0 +1,103 @@
+use super::medium_editor::MediumEditor;
+use crate::navigator::{NavigationHandle, Screen};
+use crate::widgets::Widget;
+use gettextrs::gettext;
+use glib::clone;
+use gtk::prelude::*;
+use gtk_macros::get_widget;
+use libadwaita::prelude::*;
+use log::debug;
+use musicus_backend::db::Medium;
+use musicus_backend::import::ImportSession;
+use std::rc::Rc;
+use std::sync::Arc;
+
+/// A dialog for presenting the selected medium when importing music.
+pub struct MediumPreview {
+    handle: NavigationHandle<()>,
+    session: Arc<ImportSession>,
+    widget: gtk::Box,
+}
+
+impl Screen<(Arc<ImportSession>, Medium), ()> for MediumPreview {
+    /// Create a new medium preview screen.
+    fn new((session, medium): (Arc<ImportSession>, Medium), handle: NavigationHandle<()>) -> Rc<Self> {
+        // Create UI
+
+        let builder = gtk::Builder::from_resource("/de/johrpan/musicus/ui/medium_preview.ui");
+
+        get_widget!(builder, gtk::Box, widget);
+        get_widget!(builder, gtk::Button, back_button);
+        get_widget!(builder, gtk::Box, medium_box);
+        get_widget!(builder, gtk::Label, name_label);
+
+        let this = Rc::new(Self {
+            handle,
+            session,
+            widget,
+        });
+
+        // Connect signals and callbacks
+
+        back_button.connect_clicked(clone!(@weak this => move |_| {
+            this.handle.pop(None);
+        }));
+
+        // Populate the widget
+
+        name_label.set_text(&medium.name);
+
+        for track_set in medium.tracks {
+            let recording = &track_set.recording;
+
+            let frame = gtk::FrameBuilder::new()
+                .margin_bottom(12)
+                .build();
+
+            let list = gtk::ListBoxBuilder::new()
+                .selection_mode(gtk::SelectionMode::None)
+                .build();
+
+            let header = libadwaita::ActionRowBuilder::new()
+                .activatable(false)
+                .title(&recording.work.get_title())
+                .subtitle(&recording.get_performers())
+                .build();
+
+            list.append(&header);
+
+            for track in track_set.tracks {
+                let mut parts = Vec::<String>::new();
+                for part in &track.work_parts {
+                    parts.push(track_set.recording.work.parts[*part].title.clone());
+                }
+
+                let title = if parts.is_empty() {
+                    gettext("Unknown")
+                } else {
+                    parts.join(", ")
+                };
+
+                let row = libadwaita::ActionRowBuilder::new()
+                    .activatable(false)
+                    .title(&title)
+                    .subtitle(&track.path)
+                    .margin_start(12)
+                    .build();
+
+                list.append(&row);
+            }
+
+            frame.set_child(Some(&list));
+            medium_box.append(&frame);
+        }
+
+        this
+    }
+}
+
+impl Widget for MediumPreview {
+    fn get_widget(&self) -> gtk::Widget {
+        self.widget.clone().upcast()
+    }
+}