imageView: Remove expression for fullscreen icon

src/widgets/image.rs

@@ -829,7 +829,8 @@ impl LpImage {
     async fn set_file_loaded(&self, file: &gio::File) {
         let imp = self.imp();
 
-        // Do not check if same file since it might be set via initialized with `Self::init` before
+        // Do not check if same file since it might be set via initialized with
+        // `Self::init` before
         imp.file.replace(Some(file.clone()));
         self.reload_file_info().await;
         self.setup_file_monitor().await;
@@ -845,7 +846,8 @@ impl LpImage {
         imp.file.replace(Some(file.clone()));
         self.reload_file_info().await;
 
-        // Reload if mime type changed since other decoding path might be responsible now
+        // Reload if mime type changed since other decoding path might be responsible
+        // now
         if self.metadata().mime_type() != prev_mime_type {
             self.load(file).await;
             return;

src/widgets/image_view.rs

@@ -73,6 +73,8 @@ mod imp {
         pub(super) controls_box_end: TemplateChild<gtk::Widget>,
         #[template_child]
         pub(super) controls_box_end_events: TemplateChild<gtk::EventControllerMotion>,
+        #[template_child]
+        pub(super) fullscreen_button: TemplateChild<gtk::Button>,
 
         #[template_child]
         pub sliding_view: TemplateChild<LpSlidingView>,
@@ -102,7 +104,6 @@ mod imp {
 
         fn class_init(klass: &mut Self::Class) {
             Self::bind_template(klass);
-            Self::Type::bind_template_callbacks(klass);
         }
 
         fn instance_init(obj: &glib::subclass::InitializingObject<Self>) {
@@ -275,7 +276,6 @@ glib::wrapper! {
         @implements gtk::Buildable, gtk::ConstraintTarget, gtk::Orientable;
 }
 
-#[gtk::template_callbacks]
 impl LpImageView {
     pub fn set_images_from_files(&self, files: Vec<gio::File>) {
         // Add image to recently used file. Does not work in Flatpaks:
@@ -622,13 +622,14 @@ impl LpImageView {
         }
     }
 
-    #[template_callback]
-    fn get_fullscreen_icon(&self, fullscreened: bool) -> &'static str {
-        if fullscreened {
+    pub fn on_fullscreen_changed(&self, is_fullscreened: bool) {
+        let icon = if is_fullscreened {
             "view-restore-symbolic"
         } else {
             "view-fullscreen-symbolic"
-        }
+        };
+
+        self.imp().fullscreen_button.set_icon_name(icon);
     }
 
     pub fn zoom_out(&self) {

src/widgets/image_view.ui

@@ -81,13 +81,6 @@
             <child>
               <object class="GtkButton" id="fullscreen_button">
                 <property name="halign">end</property>
-                <binding name="icon-name">
-                  <closure type="gchararray" function="get_fullscreen_icon">
-                    <lookup type="GtkWindow" name="fullscreened">
-                      <lookup type="GtkWidget" name="root">LpImageView</lookup>
-                    </lookup>
-                  </closure>
-                </binding>
                 <property name="action-name">win.toggle-fullscreen</property>
                 <property name="tooltip-text" translatable="yes">Toggle Fullscreen</property>
                 <style>

src/window.rs

@@ -290,6 +290,7 @@ mod imp {
             );
 
             obj.on_current_page_changed();
+            obj.on_fullscreen_changed();
 
             self.image_view.connect_current_page_notify(
                 glib::clone!(@weak obj => move |_| obj.on_current_page_changed()),
@@ -1002,6 +1003,10 @@ impl LpWindow {
     }
 
     fn on_fullscreen_changed(&self) {
+        self.imp()
+            .image_view
+            .on_fullscreen_changed(self.is_fullscreened());
+
         self.update_headerbar_style();
 
         if !self.is_fullscreened() {