it compiles!

src/MainWindow.vala

@@ -1,25 +1,25 @@
-public class Monitor.MainWindow : Adw.ApplicationWindow {
+public class Monitor.MainWindow : Gtk.ApplicationWindow {
     // application reference
     private Shortcuts shortcuts;
 
     private Resources resources;
 
     // Widgets
-    public Headerbar headerbar;
+    //  public HeaderbarContent headerbar_content;
 
     //  public ProcessView process_view;
     //  public SystemView system_view;
     public ContainerView container_view;
     private Gtk.Stack stack;
 
-    private Statusbar statusbar;
+    //  private Statusbar statusbar;
 
     public DBusServer dbusserver;
 
 
     // Constructs a main window
     public MainWindow (MonitorApp app) {
-        Adw.init ();
+        //  Adw.init ();
         this.set_application (app);
 
         setup_window_state ();
@@ -48,31 +48,38 @@ public class Monitor.MainWindow : Adw.ApplicationWindow {
         stack_switcher.valign = Gtk.Align.CENTER;
         stack_switcher.set_stack (stack);
 
-        headerbar = new Headerbar (this);
-        headerbar.set_title_widget (stack_switcher);
-        headerbar.preferences_grid.attach (new PreferencesView (), 0, 0, 1, 1);
+        var headerbar = new Gtk.HeaderBar () {
+            title_widget = stack_switcher,
+            hexpand = true
+        };
+
+        //  headerbar.search_revealer.set_reveal_child (stack.visible_child_name == "process_view");
+        //  stack.notify["visible-child-name"].connect (() => {
+        //      headerbar.search_revealer.set_reveal_child (stack.visible_child_name == "process_view");
+        //  });
+
+        //  headerbar_content = new HeaderbarContent (this);
+        //  headerbar.set_title_widget (stack_switcher);
+        //  headerbar.preferences_grid.attach (new PreferencesView (), 0, 0, 1, 1);
         //  sv.show_all ();
 
-        statusbar = new Statusbar ();
+        //  statusbar = new Statusbar ();
 
         var grid = new Gtk.Grid () {
             orientation = Gtk.Orientation.VERTICAL
         };
 
         grid.attach (headerbar, 0, 0, 1, 1);
         grid.attach (stack, 0, 1, 1, 1);
-        grid.attach (statusbar, 0, 2, 1, 1);
+        //  grid.attach (statusbar, 0, 2, 1, 1);
 
-        set_content (grid);
+        //  set_content (grid);
+        set_child (grid);
 
         present ();
 
         dbusserver = DBusServer.get_default ();
 
-        headerbar.search_revealer.set_reveal_child (stack.visible_child_name == "process_view");
-        stack.notify["visible-child-name"].connect (() => {
-            headerbar.search_revealer.set_reveal_child (stack.visible_child_name == "process_view");
-        });
 
         new Thread<void> ("upd", () => {
             Timeout.add_seconds (MonitorApp.settings.get_int ("update-time"), () => {
@@ -86,7 +93,7 @@ public class Monitor.MainWindow : Adw.ApplicationWindow {
                     //  system_view.update ();
                     dbusserver.indicator_state (MonitorApp.settings.get_boolean ("indicator-state"));
                     var res = resources.serialize ();
-                    statusbar.update (res);
+                    //  statusbar.update (res);
                     dbusserver.update (res);
                     return false;
                 });
@@ -104,7 +111,7 @@ public class Monitor.MainWindow : Adw.ApplicationWindow {
         });
 
         shortcuts = new Shortcuts (this);
-        key_press_event.connect ((e) => shortcuts.handle (e));
+        //  key_press_event.connect ((e) => shortcuts.handle (e));
 
         app.window_removed.connect (() => {
             int position_x, position_y;
@@ -113,8 +120,8 @@ public class Monitor.MainWindow : Adw.ApplicationWindow {
             //  get_position (out position_x, out position_y);
             MonitorApp.settings.set_int ("window-width", window_width);
             MonitorApp.settings.set_int ("window-height", window_height);
-            MonitorApp.settings.set_int ("position-x", position_x);
-            MonitorApp.settings.set_int ("position-y", position_y);
+            //  MonitorApp.settings.set_int ("position-x", position_x);
+            //  MonitorApp.settings.set_int ("position-y", position_y);
             //  MonitorApp.settings.set_boolean ("is-maximized", this.is_maximized);
 
             MonitorApp.settings.set_string ("opened-view", stack.visible_child_name);

src/Views/ContainerView/ContainerInfoView/ContainerInfoCharts.vala

@@ -22,10 +22,10 @@ public class Monitor.ContainerInfoCharts : Gtk.Grid {
         ram_chart.height_request = 60;
 
         var cpu_graph_box = new Gtk.Box (Gtk.Orientation.HORIZONTAL, 0);
-        cpu_graph_box.add (cpu_chart);
+        cpu_graph_box.append (cpu_chart);
 
         var mem_graph_box = new Gtk.Box (Gtk.Orientation.HORIZONTAL, 0);
-        mem_graph_box.add (ram_chart);
+        mem_graph_box.append (ram_chart);
 
         cpu_label = new Gtk.Label ("CPU: " + Utils.NO_DATA);
         cpu_label.get_style_context ().add_class (Granite.STYLE_CLASS_H4_LABEL);

src/Views/ContainerView/ContainerInfoView/ContainerInfoHeader.vala

@@ -21,7 +21,7 @@ public class Monitor.ContainerInfoHeader : Gtk.Grid {
         regex = /(?i:^.*\.(xpm|png)$)/; // vala-lint=space-before-paren,
         /* *INDENT-ON* */
 
-        icon = new Gtk.Image.from_icon_name ("application-x-executable", Gtk.IconSize.DIALOG);
+        icon = new Gtk.Image.from_icon_name ("application-x-executable");
         icon.set_pixel_size (64);
         icon.valign = Gtk.Align.END;
 

src/Views/ContainerView/ContainerInfoView/ContainerInfoView.vala

@@ -20,13 +20,16 @@ public class Monitor.ContainerInfoView : Gtk.Grid {
     private Gtk.Label ram_label;
 
     construct {
-        this.expand = false;
+        //  this.expand = false;
         this.width_request = 200;
 
         column_spacing = 6;
         row_spacing = 6;
         vexpand = false;
-        margin = 12;
+        margin_start = 12;
+        margin_end = 12;
+        margin_top = 12;
+        margin_bottom = 12;
         column_homogeneous = true;
         row_homogeneous = false;
 

src/Views/ContainerView/ContainerView.vala

@@ -15,16 +15,16 @@ public class Monitor.ContainerView : Gtk.Box {
 
     public ContainerView () {
 
-        var container_tree_view_scrolled = new Gtk.ScrolledWindow (null, null);
-        container_tree_view_scrolled.add (container_treeview);
+        var container_tree_view_scrolled = new Gtk.ScrolledWindow ();
+        container_tree_view_scrolled.set_child (container_treeview);
 
         var paned = new Gtk.Paned (Gtk.Orientation.HORIZONTAL);
-        paned.pack1 (container_tree_view_scrolled, true, false);
+        paned.set_start_child (container_tree_view_scrolled);
         // paned.pack2 (container_info_view, true, false);
         paned.set_position (paned.max_position);
 
 
-        add (paned);
+        append (paned);
     }
 
     private void set_container_container_info_view (DockerContainer container) {

src/Views/PreferencesView/PreferencesGeneralPage.vala

@@ -13,7 +13,7 @@
 
     public PreferencesGeneralPage () {
 
-        var icon = new Gtk.Image.from_icon_name ("preferences-system", Gtk.IconSize.DND);
+        var icon = new Gtk.Image.from_icon_name ("preferences-system");
 
         Object (
             display_widget: icon,
@@ -66,10 +66,14 @@
             hexpand = true
         };
 
-        var content_area = new Gtk.Grid ();
-        content_area.column_spacing = 12;
-        content_area.row_spacing = 12;
-        content_area.margin = 12;
+        var content_area = new Gtk.Grid () {
+            column_spacing = 12,
+            row_spacing = 12,
+            margin_start = 12,
+            margin_end = 12,
+            margin_top = 12,
+            margin_bottom = 12,
+        };
         content_area.attach (background_label, 0, 1, 1, 1);
         content_area.attach (background_switch, 1, 1, 1, 1);
         content_area.attach (enable_smooth_lines_label, 0, 2, 1, 1);
@@ -79,7 +83,7 @@
         content_area.attach (enable_containers_view_label, 0, 5, 1, 1);
         content_area.attach (enable_containers_view_switch, 1, 5, 1, 1);
 
-        add (content_area);
+        append (content_area);
 
         background_switch.notify["active"].connect (() => {
             MonitorApp.settings.set_boolean ("background-state", background_switch.state);

src/Views/PreferencesView/PreferencesView.vala

@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: LGPL-3.0-or-later
  */
 
- public class Monitor.PreferencesView : Gtk.Paned {
+ public class Monitor.PreferencesView : Gtk.Box {
     private PreferencesGeneralPage general_page = new PreferencesGeneralPage ();
     private PreferencesIndicatorPage indicator_page = new PreferencesIndicatorPage ();
 
@@ -12,9 +12,11 @@
         general_page.background_switch.notify["active"].connect (() => set_background_switch_state ());
         indicator_page.status_switch.notify["active"].connect (() => set_background_switch_state ());
 
+        var paned = new Gtk.Paned (Gtk.Orientation.HORIZONTAL);
+
         height_request = 300;
         width_request = 500;
-        set_position (135);
+        paned.set_position (135);
 
         var stack = new Gtk.Stack ();
         stack.add_named (indicator_page, "indicator_page");
@@ -24,8 +26,9 @@
             width_request = 135
         };
 
-        pack1 (settings_sidebar, true, false);
-        pack2 (stack, true, false);
+        paned.set_start_child (settings_sidebar);
+        paned.set_end_child (stack);
+        append (paned);
     }
 
     private void set_background_switch_state () {

src/Views/SystemView/SystemNetworkView.vala

@@ -2,7 +2,7 @@ public class Monitor.SystemNetworkView : Gtk.Grid {
     private Chart network_chart;
     private Network network;
 
-    private LabelH4 network_name_label;
+    private Gtk.Label network_name_label;
     private LabelRoundy network_upload_label;
     private LabelRoundy network_download_label;
 
@@ -18,7 +18,7 @@ public class Monitor.SystemNetworkView : Gtk.Grid {
     public SystemNetworkView (Network _network) {
         network = _network;
 
-        network_name_label = new LabelH4 (_("Network"));
+        network_name_label = new Gtk.Label (_("Network"));
 
         network_download_label = new LabelRoundy (_("DOWN"));
         network_download_label.val.set_width_chars (7);

src/Views/SystemView/SystemStorageView.vala

@@ -2,7 +2,7 @@ public class Monitor.SystemStorageView : Gtk.Grid {
     private Chart storage_chart;
     private Storage storage;
 
-    private LabelH4 storage_name_label;
+    private Gtk.Label storage_name_label;
     private LabelRoundy storage_read_label;
     private LabelRoundy storage_write_label;
 
@@ -20,7 +20,7 @@ public class Monitor.SystemStorageView : Gtk.Grid {
     public SystemStorageView (Storage _storage) {
         storage = _storage;
 
-        storage_name_label = new LabelH4 (_("Storage"));
+        storage_name_label = new Gtk.Label (_("Storage"));
 
         storage_write_label = new LabelRoundy (_("WRITE"));
         storage_write_label.val.set_width_chars (7);

src/Widgets/Chart/Chart.vala

@@ -27,7 +27,7 @@ public class Monitor.Chart : Gtk.Box {
         };
 
         live_chart = new LiveChart.Chart (config);
-        live_chart.expand = true;
+        //  live_chart.expand = true;
         live_chart.legend.visible = false;
         live_chart.grid.visible = true;
         live_chart.background.visible = false;
@@ -60,7 +60,7 @@ public class Monitor.Chart : Gtk.Box {
 
             live_chart.add_serie (serie);
         }
-        add (live_chart);
+        append (live_chart);
         return this;
     }
 
@@ -73,7 +73,7 @@ public class Monitor.Chart : Gtk.Box {
             serie.line.color = colors.get_color_by_index (i);
             live_chart.add_serie (serie);
         }
-        add (live_chart);
+        append (live_chart);
         return this;
     }
 

src/Widgets/Headerbar/Headerbar.vala → src/Widgets/Headerbar/HeaderbarContent.vala

@@ -1,4 +1,4 @@
-public class Monitor.Headerbar : Gtk.HeaderBar {
+public class Monitor.HeaderbarContent {
     private MainWindow window;
 
     public Search search;
@@ -14,7 +14,7 @@ public class Monitor.Headerbar : Gtk.HeaderBar {
         //  title_widget = new Gtk.Label(_("Monitor"));
     }
 
-    public Headerbar (MainWindow window) {
+    public HeaderbarContent (MainWindow window) {
         this.window = window;
 
         var preferences_button = new Gtk.MenuButton ();

src/Widgets/Headerbar/Search.vala

@@ -24,19 +24,19 @@ public class Monitor.Search : Gtk.SearchEntry {
     private void connect_signal () {
         this.search_changed.connect (() => {
             // collapse tree only when search is focused and changed
-            if (this.is_focus) {
-                process_tree_view.collapse_all ();
-            }
+            //  if (this.is_focus) {
+            //      process_tree_view.collapse_all ();
+            //  }
 
             filter_model.refilter ();
 
             // focus on child row to avoid the app crashes by clicking "Kill/End Process" buttons in headerbar
             process_tree_view.focus_on_child_row ();
             this.grab_focus ();
 
-            if (this.text != "") {
-                this.insert_at_cursor ("");
-            }
+            //  if (this.text != "") {
+            //      this.insert_at_cursor ("");
+            //  }
         });
     }
 
@@ -87,7 +87,7 @@ public class Monitor.Search : Gtk.SearchEntry {
     public void activate_entry (string search_text = "") {
         this.text = "";
         this.search_changed ();
-        this.insert_at_cursor (search_text);
+        //  this.insert_at_cursor (search_text);
     }
 
 }

src/Widgets/WidgetResource/WidgetResource.vala

@@ -1,5 +1,5 @@
 public class Monitor.WidgetResource : Gtk.Box {
-    private LabelH4 _title = new LabelH4 (Utils.NO_DATA);
+    private Gtk.Label _title = new Gtk.Label (Utils.NO_DATA);
 
     public string title {
         set {

src/meson.build

@@ -4,8 +4,8 @@ source_app_files = [
     'Utils.vala',
 
     # Views
-    'Views/ProcessView/ProcessView.vala',
-    'Views/ProcessView/ProcessInfoView/ProcessInfoView.vala',
+    # 'Views/ProcessView/ProcessView.vala',
+    # 'Views/ProcessView/ProcessInfoView/ProcessInfoView.vala',
     'Views/ProcessView/ProcessTreeView/CPUProcessTreeView.vala',
 
     'Views/PreferencesView/PreferencesView.vala',
@@ -27,19 +27,19 @@ source_app_files = [
     'Views/ContainerView/ContainerInfoView/ContainerInfoCharts.vala',
 
     # Widgets related only to ProcessInfoView
-    'Views/ProcessView/ProcessInfoView/Preventor.vala',
+    # 'Views/ProcessView/ProcessInfoView/Preventor.vala',
     'Views/ProcessView/ProcessInfoView/ProcessInfoHeader.vala',
     'Views/ProcessView/ProcessInfoView/ProcessInfoCPURAM.vala',
     'Views/ProcessView/ProcessInfoView/ProcessInfoIOStats.vala',
     'Views/ProcessView/ProcessInfoView/OpenFilesTreeView.vala',
 
     # Widgets
-    'Widgets/Headerbar/Headerbar.vala',
-    'Widgets/Headerbar/Search.vala',
-    'Widgets/Statusbar/Statusbar.vala',
+    # 'Widgets/Headerbar/HeaderbarContent.vala',
+    # 'Widgets/Headerbar/Search.vala',
+    # 'Widgets/Statusbar/Statusbar.vala',
     'Widgets/Labels/LabelVertical.vala',
     'Widgets/Labels/LabelRoundy.vala',
-    'Widgets/Labels/LabelH4.vala',
+    # 'Widgets/Labels/LabelH4.vala',
     'Widgets/Chart/Chart.vala',
     'Widgets/WidgetResource/WidgetResource.vala',