propertiesView: Add button to copy coordiantes

Copy location coordinates in a machine readable format for use in other apps.

Closes #164

Part-of: <https://gitlab.gnome.org/GNOME/loupe/-/merge_requests/371>

src/metadata/gps.rs

@@ -47,11 +47,23 @@ impl GPSCoord {
         let deg = self.deg;
 
         if let (Some(min), Some(sec)) = (self.min, self.sec) {
-            format!("{deg}° {min}′ {sec}″ {reference}")
+            format!("{deg}° {min}′ {sec:05.2}″ {reference}")
         } else if let Some(min) = self.min {
-            format!("{deg}° {min}′ {reference}")
+            format!("{deg}° {min:06.3}′ {reference}")
         } else {
-            format!("{deg}° {reference}")
+            format!("{deg:08.5}° {reference}")
+        }
+    }
+
+    fn machine_readable(&self, reference: &str) -> String {
+        let deg = self.deg;
+
+        if let (Some(min), Some(sec)) = (self.min, self.sec) {
+            format!("{reference}{deg}°{min}'{sec:05.2}\"")
+        } else if let Some(min) = self.min {
+            format!("{reference}{deg}°{min:06.3}'")
+        } else {
+            format!("{reference}{deg:08.5}°")
         }
     }
 
@@ -159,6 +171,18 @@ impl GPSLocation {
         coord.display(&reference)
     }
 
+    pub fn machine_readable(&self) -> String {
+        let coord = self.latitude;
+        let reference = if coord.sing { "N" } else { "S" };
+        let lat = coord.machine_readable(reference);
+
+        let coord = self.longitude;
+        let reference = if coord.sing { "E" } else { "W" };
+        let lon = coord.machine_readable(reference);
+
+        format!("{lat} {lon}")
+    }
+
     pub fn longitude_display(&self) -> String {
         let coord = self.longitude;
         let reference = if coord.sing {

src/widgets/properties_view.rs

@@ -20,6 +20,7 @@ use std::cell::{OnceCell, RefCell};
 
 use adw::prelude::*;
 use adw::subclass::prelude::*;
+use glib::translate::IntoGlib;
 use glib::Properties;
 use gtk::CompositeTemplate;
 
@@ -91,6 +92,10 @@ mod imp {
                 obj.imp().open_directory().await;
             });
 
+            klass.install_action("properties.copy-location", None, move |obj, _, _| {
+                obj.imp().copy_location();
+            });
+
             klass.install_action("properties.open-location", None, move |obj, _, _| {
                 obj.imp().open_location();
             });
@@ -280,6 +285,26 @@ mod imp {
             };
         }
 
+        /// Copy GPS location
+        fn copy_location(&self) {
+            let obj = self.obj();
+
+            if let Some(location) = obj.image().and_then(|x| x.metadata().gps_location()) {
+                let clipboard = obj.display().clipboard();
+                clipboard.set_text(&location.machine_readable());
+                let _ = obj.activate_action(
+                    "win.show-toast",
+                    Some(
+                        &(
+                            gettext("Image Coordinates Copied"),
+                            adw::ToastPriority::Normal.into_glib(),
+                        )
+                            .to_variant(),
+                    ),
+                );
+            }
+        }
+
         /// Open GPS location in apps like Maps via `geo:` URI
         fn open_location(&self) {
             let obj = self.obj();

src/widgets/properties_view.ui

@@ -104,9 +104,23 @@
                 <child>
                   <object class="AdwActionRow" id="location">
                     <property name="title" translatable="yes">Location</property>
-                    <property name="activatable-widget">location_button</property>
+                    <property name="subtitle-selectable">True</property>
+                    <style>
+                      <class name="numeric" />
+                    </style>
                     <child type="suffix">
-                      <object class="GtkButton" id="location_button">
+                      <object class="GtkButton">
+                        <property name="valign">center</property>
+                        <property name="action-name">properties.copy-location</property>
+                        <property name="icon-name">edit-copy-symbolic</property>
+                        <property name="tooltip-text" translatable="yes">Copy Coordinates</property>
+                        <style>
+                          <class name="flat" />
+                        </style>
+                      </object>
+                    </child>
+                    <child type="suffix">
+                      <object class="GtkButton">
                         <property name="valign">center</property>
                         <property name="action-name">properties.open-location</property>
                         <property name="icon-name">mark-location-symbolic</property>