BtScan: rewrite as granite.messagedialog, gtk4 prep

src/Application.vala

@@ -77,7 +77,7 @@ public class BluetoothApp : Gtk.Application {
 
             if (files.length > 0) {
                 if (bt_scan == null) {
-                    bt_scan = new BtScan (this, object_manager);
+                    bt_scan = new BtScan (object_manager);
                     Idle.add (() => { // Wait for async BtScan initialisation
                         bt_scan.show_all ();
                         return Source.REMOVE;

src/Dialog/BtScan.vala

@@ -1,104 +1,62 @@
-// -*- Mode: vala; indent-tabs-mode: nil; tab-width: 4 -*-
-/*-
- * Copyright (c) 2016-2018 elementary LLC.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+/*
+ * SPDX-License-Identifier: LGPL-3.0-or-later
+ * SPDX-FileCopyrightText: 2016-2024 elementary, Inc. (https://elementary.io)
  *
  * Authored by: Corentin Noël <[email protected]>
  *              Oleksandr Lynok <[email protected]>
  *              Torikulhabib <[email protected]>
  */
 
-public class BtScan : Granite.Dialog {
+public class BtScan : Granite.MessageDialog {
     public signal void send_file (Bluetooth.Device device);
-    private Gtk.ListBox list_box;
+
     public Bluetooth.ObjectManager manager { get; construct;}
 
-    public BtScan (Gtk.Application application, Bluetooth.ObjectManager manager) {
-        Object (application: application,
-                manager: manager,
-                resizable: false
-        );
+    private Gtk.ListBox list_box;
+
+    public BtScan (Bluetooth.ObjectManager manager) {
+        Object (manager: manager);
     }
 
     construct {
-        var icon_image = new Gtk.Image.from_icon_name ("io.elementary.bluetooth", Gtk.IconSize.DIALOG) {
-            valign = Gtk.Align.CENTER,
-            halign = Gtk.Align.CENTER
-        };
-
-        var title_label = new Gtk.Label (_("Bluetooth File Transfer")) {
-            max_width_chars = 45,
-            use_markup = true,
-            wrap = true,
-            xalign = 0
-        };
-        title_label.get_style_context ().add_class ("primary");
-
-        var info_label = new Gtk.Label (_("Select a Bluetooth Device Below to Send Files")) {
-            max_width_chars = 45,
-            use_markup = true,
-            wrap = true,
-            xalign = 0
-        };
+        image_icon = new ThemedIcon ("io.elementary.bluetooth");
+        primary_text = _("Bluetooth File Transfer");
+        secondary_text = _("Select a Bluetooth Device Below to Send Files");
+        resizable = true;
 
-        var empty_alert = new Granite.Widgets.AlertView (
+        var placeholder = new Granite.Widgets.AlertView (
             _("No Devices Found"),
             _("Please ensure that your devices are visible and ready for pairing."),
             ""
         );
-        empty_alert.show_all ();
+        placeholder.show_all ();
+
         list_box = new Gtk.ListBox () {
             activate_on_single_click = true,
-            selection_mode = Gtk.SelectionMode.BROWSE
+            selection_mode = BROWSE
         };
         list_box.set_sort_func ((Gtk.ListBoxSortFunc) compare_rows);
-        list_box.set_header_func ((Gtk.ListBoxUpdateHeaderFunc) title_rows);
-        list_box.set_placeholder (empty_alert);
+        list_box.set_placeholder (placeholder);
 
         var scrolled = new Gtk.ScrolledWindow (null, null) {
-            expand = true,
+            hexpand = true,
+            vexpand = true,
+            child = list_box,
+            hscrollbar_policy = NEVER,
+            propagate_natural_height = true,
+            max_content_height = 350
         };
-        scrolled.add (list_box);
+        scrolled.get_style_context ().add_class (Gtk.STYLE_CLASS_FRAME);
 
-        var overlay = new Gtk.Overlay ();
-        overlay.add (scrolled);
+        var overlay = new Gtk.Overlay () {
+            child = scrolled
+        };
 
         var overlaybar = new Granite.Widgets.OverlayBar (overlay) {
             label = _("Discovering")
         };
 
-        var frame = new Gtk.Frame (null) {
-            margin_left = 10,
-            margin_right = 10,
-            width_request = 350,
-            height_request = 350
-        };
-        frame.add (overlay);
-        var image_label = new Gtk.Grid () {
-            margin_bottom = 5
-        };
-        image_label.attach (icon_image, 0, 0, 1, 2);
-        image_label.attach (title_label, 1, 0, 1, 1);
-        image_label.attach (info_label, 1, 1, 1, 1);
-        var frame_device = new Gtk.Grid () {
-            orientation = Gtk.Orientation.VERTICAL,
-            valign = Gtk.Align.CENTER
-        };
-        frame_device.add (image_label);
-        frame_device.add (frame);
-        get_content_area ().add (frame_device);
+        custom_bin.add (overlay);
 
         manager.device_added.connect (add_device);
         manager.device_removed.connect (device_removed);
@@ -107,11 +65,13 @@ public class BtScan : Granite.Dialog {
         });
 
         add_button (_("Close"), Gtk.ResponseType.CLOSE);
+
         response.connect ((response_id) => {
             manager.stop_discovery.begin ();
             destroy ();
         });
     }
+
     public override void show () {
         base.show ();
         var devices = manager.get_devices ();
@@ -151,6 +111,7 @@ public class BtScan : Granite.Dialog {
             }
         }
     }
+
     [CCode (instance_pos = -1)]
     private int compare_rows (DeviceRow row1, DeviceRow row2) {
         unowned Bluetooth.Device device1 = row1.device;
@@ -183,16 +144,4 @@ public class BtScan : Granite.Dialog {
         var name2 = device2.name ?? device2.address;
         return name1.collate (name2);
     }
-    [CCode (instance_pos = -1)]
-    private void title_rows (DeviceRow row1, DeviceRow? row2) {
-        if (row2 == null) {
-            var label = new Gtk.Label (_("Available Devices"));
-            label.xalign = 0;
-            label.margin = 3;
-            label.get_style_context ().add_class (Granite.STYLE_CLASS_H4_LABEL);
-            row1.set_header (label);
-        } else {
-            row1.set_header (null);
-        }
-    }
 }