Figure out the selected terrain from the palette

hex-grid/src/main.rs

@@ -44,7 +44,7 @@ fn main() {
 
 pub struct HexGridWindowPrivate {
     layout: gtk::Box,
-    palette: gtk::Box,
+    palette: gtk::ListBox,
 
     drawing_area: DrawingArea,
     hex_address: labeled_field::LabeledField,
@@ -95,11 +95,7 @@ impl ObjectSubclass for HexGridWindowPrivate {
         let canvas_address = labeled_field::LabeledField::new("Canvas Address", "-----");
         let hex_address = labeled_field::LabeledField::new("Hex Address", "-----");
 
-        let palette = gtk::Box::builder()
+        let palette = gtk::ListBox::builder().hexpand(true).build();
-            .spacing(8)
-            .orientation(gtk::Orientation::Vertical)
-            .hexpand(true)
-            .build();
 
         sidebar.append(&canvas_address);
         sidebar.append(&hex_address);
@@ -169,6 +165,12 @@ impl ObjectImpl for HexGridWindowPrivate {
         self.palette
             .append(&palette_entry::PaletteEntry::new(&swamp));
 
+        self.palette.connect_selected_rows_changed(|palette| {
+            let row: Option<palette_entry::PaletteEntry> =
+                palette.selected_row().and_then(|r| r.downcast().ok());
+            println!("selected rows changed to: {:?}", row.map(|r| r.terrain()));
+        });
+
         let motion_controller = gtk::EventControllerMotion::new();
         {
             let canvas_address = self.canvas_address.clone();

hex-grid/src/palette_entry.rs

@@ -49,4 +49,8 @@ impl PaletteEntry {
 
         row
     }
+
+    pub fn terrain(&self) -> tile::Terrain {
+        self.imp().terrain.borrow().clone()
+    }
 }