image: Implement Copy to clipboard

data/gtk/image_view.ui

@@ -101,6 +101,10 @@
         <attribute name="label" translatable="yes">_Print…</attribute>
         <attribute name="action">win.print</attribute>
       </item>
+      <item>
+        <attribute name="label" translatable="yes">_Copy</attribute>
+        <attribute name="action">win.copy</attribute>
+      </item>
       <!--<item>
         <attribute name="label" translatable="yes">_Rotate</attribute>
         <attribute name="action">win.rotate-image</attribute>

src/application.rs

@@ -164,6 +164,7 @@ impl LpApplication {
         self.set_accels_for_action("app.new-window", &["<Primary>N"]);
         self.set_accels_for_action("win.open", &["<Primary>O"]);
         self.set_accels_for_action("win.print", &["<Primary>P"]);
+        self.set_accels_for_action("win.copy", &["<Primary>C"]);
         self.set_accels_for_action("win.show-help-overlay", &["<Primary>question"]);
         self.set_accels_for_action("win.toggle-fullscreen", &["F11"]);
         self.set_accels_for_action("window.close", &["<Primary>W"]);

src/widgets/image.rs

@@ -205,4 +205,9 @@ impl LpImage {
         let imp = self.imp();
         imp.image_height.get()
     }
+
+    pub fn texture(&self) -> Option<gdk::Texture> {
+        let imp = self.imp();
+        imp.texture.borrow().clone()
+    }
 }

src/widgets/image_view.rs

@@ -342,6 +342,19 @@ impl LpImageView {
         Ok(())
     }
 
+    pub fn copy(&self) -> anyhow::Result<()> {
+        let clipboard = self.clipboard();
+        let imp = self.imp();
+
+        if let Some(texture) = imp.picture.texture() {
+            clipboard.set_texture(&texture);
+        } else {
+            anyhow::bail!("No Image displayed.");
+        }
+
+        Ok(())
+    }
+
     pub fn uri(&self) -> Option<String> {
         let imp = self.imp();
         imp.uri.borrow().to_owned()

src/window.rs

@@ -107,6 +107,10 @@ mod imp {
                 win.print();
             });
 
+            klass.install_action("win.copy", None, move |win, _, _| {
+                win.copy();
+            });
+
             klass.install_action("win.show-toast", Some("(si)"), move |win, _, var| {
                 if let Some((ref toast, i)) = var.map(|v| v.get::<(String, i32)>()).flatten() {
                     win.show_toast(toast, adw::ToastPriority::__Unknown(i));
@@ -303,6 +307,14 @@ impl LpWindow {
         }
     }
 
+    fn copy(&self) {
+        let imp = self.imp();
+
+        if let Err(e) = imp.image_view.copy() {
+            log::error!("Failed to copy to clipboard: {}", e);
+        }
+    }
+
     fn show_toast(&self, text: &impl AsRef<str>, priority: adw::ToastPriority) {
         let imp = self.imp();
 
@@ -335,6 +347,7 @@ impl LpWindow {
         self.action_set_enabled("win.set-wallpaper", enabled);
         self.action_set_enabled("win.toggle-fullscreen", enabled);
         self.action_set_enabled("win.print", enabled);
+        self.action_set_enabled("win.copy", enabled);
     }
 
     // Adapted from https://gitlab.gnome.org/GNOME/eog/-/blob/master/src/eog-window.c:eog_window_obtain_desired_size