Add GOM demo

src/Gom/main.blp

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+using Gtk 4.0;
+using Adw 1;
+
+Adw.ToastOverlay overlay {
+  Adw.StatusPage {
+    title: _("GOM Demo");
+    description: _("Simple database operations using GOM");
+
+    Box {
+      orientation: vertical;
+      halign: center;
+      spacing: 18;
+
+      Box {
+        styles [
+          "linked"
+        ]
+
+        Entry filter_entry {
+          placeholder-text: "Enter Text";
+          width-request: 250;
+        }
+
+        Button filter_button {
+          label: _("Filter");
+        }
+      }
+
+      Box {
+        styles [
+          "linked"
+        ]
+
+        Entry url_entry {
+          placeholder-text: "Enter URL";
+          width-request: 250;
+        }
+
+        Button insert_button {
+          label: _("Insert");
+        }
+      }
+
+      Box {
+        styles [
+          "linked"
+        ]
+
+        Entry id_entry {
+          placeholder-text: "Enter ID";
+          width-request: 250;
+        }
+
+        Button find_button {
+          label: _("Search");
+        }
+      }
+
+      Frame {
+        ColumnView column_view {
+          show-column-separators: true;
+
+          ColumnViewColumn col1 {
+            title: _("URL");
+            expand: true;
+
+            factory: SignalListItemFactory {};
+          }
+
+          ColumnViewColumn col2 {
+            title: _("ID");
+            expand: true;
+
+            factory: SignalListItemFactory {};
+          }
+        }
+      }
+
+      Label result_label {
+        label: _("Results will appear here");
+        wrap: true;
+        width-request: 250;
+      }
+    }
+  }
+}

src/Gom/main.js

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+import GObject from "gi://GObject";
+import Gom from "gi://Gom";
+import Gtk from "gi://Gtk";
+import Adw from "gi://Adw";
+import GLib from "gi://GLib";
+import Gio from "gi://Gio";
+
+const INT32_MAX = 2147483647;
+
+const ItemClass = GObject.registerClass({
+  GTypeName: 'Item',
+  Properties: {
+    'id': GObject.ParamSpec.int(
+      'id', 'ID', 'An ID',
+      GObject.ParamFlags.READWRITE | GObject.ParamFlags.CONSTRUCT,
+      0, INT32_MAX, 0
+    ),
+    'url': GObject.ParamSpec.string(
+      'url', 'URL', 'A URL',
+      GObject.ParamFlags.READWRITE | GObject.ParamFlags.CONSTRUCT,
+      ''
+    ),
+  },
+}, class ItemClass extends Gom.Resource { });
+
+let adapter, repository;
+
+function initDatabase() {
+  adapter = new Gom.Adapter();
+  adapter.open_sync(':memory:',);
+  repository = new Gom.Repository({ adapter: adapter });
+
+  ItemClass.set_table('items');
+  ItemClass.set_primary_key('id');
+
+  repository.automatic_migrate_sync(1, [ItemClass]);
+}
+
+function closeDatabase() {
+  if (adapter) {
+    adapter.close_sync();
+  }
+}
+
+function showToast(overlay, message) {
+  const toast = new Adw.Toast({
+    title: message,
+    timeout: 2,
+  });
+  overlay.add_toast(toast);
+}
+
+initDatabase();
+
+const url_entry = workbench.builder.get_object("url_entry");
+const id_entry = workbench.builder.get_object("id_entry");
+const insert_button = workbench.builder.get_object("insert_button");
+const find_button = workbench.builder.get_object("find_button");
+const filter_entry = workbench.builder.get_object("filter_entry");
+const filter_button = workbench.builder.get_object("filter_button");
+const result_label = workbench.builder.get_object("result_label");
+const overlay = workbench.builder.get_object("overlay");
+
+const data_model = new Gio.ListStore({ item_type: ItemClass });
+const column_view = workbench.builder.get_object("column_view");
+const col1 = workbench.builder.get_object("col1");
+const col2 = workbench.builder.get_object("col2");
+
+insert_button.connect("clicked", () => {
+  const url = url_entry.text;
+  const item = new ItemClass({ repository: repository, url: url });
+  const success = item.save_sync();
+  if (success) {
+    showToast(overlay, "Item inserted successfully");
+    data_model.append(item);
+  } else {
+    result_label.label = "Failed to insert item";
+    showToast(overlay, "Failed to insert item");
+  }
+});
+
+find_button.connect("clicked", () => {
+  data_model.remove_all();
+  const id = parseInt(id_entry.text);
+  const filter = Gom.Filter.new_eq(ItemClass, "id", id);
+  const found_item = repository.find_one_sync(ItemClass, filter);
+  if (found_item) {
+    data_model.append(found_item);
+  } else {
+    result_label.label = "Item not found";
+  }
+
+});
+
+filter_button.connect("clicked", () => {
+  data_model.remove_all();
+  const filter_text = filter_entry.text.trim();
+  if (filter_text === "") {
+    result_label.label = "Enter a value";
+    return;
+  }
+
+  const filter = Gom.Filter.new_glob(ItemClass, 'url', `*${filter_text}*`);
+  const filtered_items = repository.find_sync(ItemClass, filter);
+
+  if (filtered_items) {
+    const count = filtered_items.get_count();
+    if (count > 0) {
+      filtered_items.fetch_async(0, count, () => {
+        for (let i = 0; i < count; i++) {
+          const item = filtered_items.get_index(i);
+          if (item) {
+            data_model.append(item);
+          }
+        }
+        result_label.label = "Loaded successfully";
+      });
+    } else {
+      result_label.label = "No matching items found";
+    }
+  } else {
+    result_label.label = "No matching items found";
+  }
+});
+
+
+const factory_col1 = col1.factory;
+factory_col1.connect("setup", (_self, list_item) => {
+  const label = new Gtk.Label({
+    margin_start: 12,
+    margin_end: 12,
+  });
+  list_item.set_child(label);
+});
+factory_col1.connect("bind", (_self, list_item) => {
+  const label_widget = list_item.get_child();
+  const model_item = list_item.get_item();
+  label_widget.label = model_item.url;
+});
+
+const factory_col2 = col2.factory;
+factory_col2.connect("setup", (_self, list_item) => {
+  const label = new Gtk.Label({
+    margin_start: 12,
+    margin_end: 12,
+  });
+  list_item.set_child(label);
+});
+factory_col2.connect("bind", (_self, list_item) => {
+  const label_widget = list_item.get_child();
+  const model_item = list_item.get_item();
+  label_widget.label = model_item.id.toString();
+});
+
+column_view.model = new Gtk.SingleSelection({
+  model: data_model,
+});

src/Gom/main.json

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+{
+  "category": "feedback",
+  "description": "demo showcases inserting and retrieving items in a SQLite database using GOM",
+  "panels": ["ui", "preview"],
+  "autorun": true
+}