feat: add drag-to-move emblem, center emblem origin, and fix editor preview blurriness

src/composite_icon.rs

@@ -70,9 +70,9 @@ impl CompositeIcon {
             let (bg_w, bg_h) = parse_dims(&self.bg.content);
             let (em_w, em_h) = parse_dims(&emblem.content);
             
-            let mapped_x = self.emblem_x * bg_w / 64.0;
-            let mapped_y = self.emblem_y * bg_h / 64.0;
             let mapped_size = self.emblem_size * bg_w / 64.0; // Assuming uniform coordinate mapping scaling based on width
+            let mapped_x = (self.emblem_x * bg_w / 64.0) - (mapped_size / 2.0);
+            let mapped_y = (self.emblem_y * bg_h / 64.0) - (mapped_size / 2.0);
             
             let scale_x = mapped_size / em_w;
             let scale_y = mapped_size / em_h; // Keep aspect ratio mapping relative to its own viewBox

src/ui/editor.rs

@@ -80,16 +80,52 @@ pub fn build_editor_page(
     let refresh_preview = {
         let composite = Rc::clone(&composite);
         let preview = preview.clone();
+        let temp_path = std::env::temp_dir().join(format!("icon-color-tool-preview-{}.svg", std::process::id()));
         move || {
-            let bytes = glib::Bytes::from_owned(composite.borrow().render().into_bytes());
-            match gtk::gdk::Texture::from_bytes(&bytes) {
-                Ok(texture) => preview.set_paintable(Some(&texture)),
-                Err(_) => preview.set_paintable(gtk::gdk::Paintable::NONE),
+            let svg_data = composite.borrow().render();
+            if std::fs::write(&temp_path, svg_data).is_ok() {
+                let file = gtk::gio::File::for_path(&temp_path);
+                preview.set_file(Some(&file));
             }
         }
     };
     refresh_preview();
 
+    {
+        let drag = gtk::GestureDrag::new();
+        let initial_x = Rc::new(std::cell::Cell::new(0.0));
+        let initial_y = Rc::new(std::cell::Cell::new(0.0));
+
+        drag.connect_drag_begin({
+            let composite = Rc::clone(&composite);
+            let initial_x = initial_x.clone();
+            let initial_y = initial_y.clone();
+            move |_, _, _| {
+                initial_x.set(composite.borrow().emblem_x);
+                initial_y.set(composite.borrow().emblem_y);
+            }
+        });
+
+        drag.connect_drag_update({
+            let scale_x = scale_x.clone();
+            let scale_y = scale_y.clone();
+            let preview = preview.clone();
+            move |_, offset_x, offset_y| {
+                let width = preview.allocated_width() as f64;
+                let height = preview.allocated_height() as f64;
+                let size = width.min(height);
+                if size > 0.0 {
+                    let dx = offset_x * 64.0 / size;
+                    let dy = offset_y * 64.0 / size;
+                    scale_x.set_value(initial_x.get() + dx);
+                    scale_y.set_value(initial_y.get() + dy);
+                }
+            }
+        });
+
+        preview.add_controller(drag);
+    }
+
     {
         let composite = Rc::clone(&composite);
         let refresh_preview = refresh_preview.clone();