create grid layout

src/content/mod.rs

@@ -44,19 +44,60 @@ pub fn content(
     let null_checkbutton = gtk::CheckButton::builder()
         .build();
 
+    let layout_grid = gtk::Grid::builder()
+        .vexpand(true)
+        .hexpand(true)
+        .build();
+
+    let previews_size_group = gtk::SizeGroup::new(gtk::SizeGroupMode::Both);
+
+    let mut last_widget: (Option<gtk::Box>, i32) = (None, 0);
+
     for layout in desktop_layouts {
         let layout_name = layout.name.clone();
         let layout_id = layout.id; 
 
         let layout_box = gtk::Box::builder()
-            .orientation(gtk::Orientation::Horizontal)
+            .orientation(gtk::Orientation::Vertical)
             .build();
         let layout_preview = gtk::Image::builder()
             .resource(format!("/com/github/pikaos-linux/pikagnomelayouts/previews/{}.svg", &layout_name))
+            .vexpand(true)
+            .hexpand(true)
+            .margin_start(5)
+            .margin_end(5)
+            .margin_top(5)
             .build();
-        content_box.append(&layout_preview);
+
+        let layout_checkbutton = gtk::CheckButton::builder()
+            .group(&null_checkbutton)
+            .halign(gtk::Align::Center)
+            .valign(gtk::Align::Start)
+            .label(t!(format!("{}_label", &layout_name)))
+            .tooltip_text(t!(format!("{}_tooltip_text", &layout_name)))
+            .build();
+
+        previews_size_group.add_widget(&layout_preview);
+
+        layout_box.append(&layout_preview);
+        layout_box.append(&layout_checkbutton);
+
+        if last_widget.0.is_none() {
+            layout_grid.attach(&layout_box, 0, 0, 1, 1);
+        } else if last_widget.1 == 3 {
+            layout_grid.attach_next_to(&layout_box, Some(&last_widget.0.unwrap()), gtk::PositionType::Bottom, 1, 1)
+        } else if last_widget.1 > 3 {
+            layout_grid.attach_next_to(&layout_box, Some(&last_widget.0.unwrap()), gtk::PositionType::Left, 1, 1)
+        } else {
+            layout_grid.attach_next_to(&layout_box, Some(&last_widget.0.unwrap()), gtk::PositionType::Right, 1, 1)
+        }
+
+        last_widget.0 = Some(layout_box);
+        last_widget.1 += 1;
     }
 
+    content_box.append(&layout_grid);
+
     content_stack.add_named(
         &content_box,
         Some("content_page"),