Implement GTK+3/4 compatibility

prefs.js

@@ -83,6 +83,9 @@ const prefs = [
 function init() {
     monitoLog('initializing ${Me.metadata.name} Preferences');
     this.settings = ExtensionUtils.getSettings(SETTINGS_SCHEMA);
+
+    
+    this.gtkVersion = Gtk.get_major_version();
 }
 
 
@@ -98,12 +101,14 @@ function buildPrefsWidget() {
     let mainWidget = new Gtk.Notebook( { } );
 
     let prefsWidget = new Gtk.Grid({
-//        margin: 18,
         column_spacing: 12,
         row_spacing: 12,
 	column_homogeneous: false,
     });
 
+    if ( this.gtkVersion < 4 )
+        prefsWidget.margin = 18;
+    
     this.prefWidgets = { };
 
     // Add a simple title and add it to the prefsWidget
@@ -165,12 +170,18 @@ function buildPrefsWidget() {
 						  homogeneous: false, } );
     monitoLog ( 'Box ' + this._accountsWidgetContainer );
     monitoLog ( 'Func ' + this._accountsWidgetContainer.pack_start );
+    if ( this.gtkVersion == 4 )
         this._accountsWidgetContainer.append(accountsChooserContainer, true, true, 0);
+    else
+        this._accountsWidgetContainer.add(accountsChooserContainer, true, true, 0);
 
     this.accountsChooser = new Gtk.ListBox ( { valign: Gtk.Align.FILL,
 					      hexpand: true,
 					      vexpand: true } );
+    if ( this.gtkVersion == 4 )
         accountsChooserContainer.append(this.accountsChooser, true, true, 0);
+    else
+        accountsChooserContainer.add(this.accountsChooser, true, true, 0);
 
     // Account list
     for ( var server_id of this.getServersList ( ) )
@@ -179,7 +190,10 @@ function buildPrefsWidget() {
 
     // Action Bar
     let accountsChooserActionBar = new Gtk.ActionBar ( { valign: Gtk.Align.END } );
+    if ( this.gtkVersion == 4 )
         accountsChooserContainer.append(accountsChooserActionBar, true, true, 0);
+    else
+        accountsChooserContainer.add(accountsChooserActionBar, true, true, 0);
 
     let accountCreateButton = Gtk.Button.new_from_icon_name ( 'list-add',
                                                               Gtk.IconSize.BUTTON );
@@ -193,7 +207,10 @@ function buildPrefsWidget() {
 
     this.createAccountWidgets ( false ) ;
 
+    if ( this.gtkVersion == 4 )
         mainVbox.append(mainWidget, true, true, 0);
+    else
+        mainVbox.add(mainWidget);
     mainVbox.show_all();
 
     return mainVbox;
@@ -245,7 +262,10 @@ function createAccountWidgets ( isActive )
     this.prefWidgets = { };
 
     this._accountsWidget = new Gtk.Notebook( { } );
+    if ( this.gtkVersion == 4 )
         this._accountsWidgetContainer.append(this._accountsWidget, true, true, 0);
+    else
+        this._accountsWidgetContainer.add(this._accountsWidget);
 
     for ( var _tab of [ 'Settings', 'Columns', 'Colors', 'Filters', 'Replacements' ] )
     {
@@ -276,6 +296,8 @@ function createPrefWidgets ( noteBook, type, isActive )
         visible: true,
 	column_homogeneous: false,
     });
+    if ( this.gtkVersion < 4 )
+        grid.margin = 18;
     noteBook.append_page ( grid, new Gtk.Label ( { label: _(type), } ) );
 
     let y = 0;
@@ -340,6 +362,8 @@ function createColumnsPrefTab ( noteBook, type, isActive )
         visible: true,
 	column_homogeneous: false,
     });
+    if ( this.gtkVersion < 4 )
+        grid.margin = 18;
     noteBook.append_page ( grid, new Gtk.Label ( { label: _(type), } ) );
 
     let _store = new Gtk.TreeStore();
@@ -354,13 +378,19 @@ function createColumnsPrefTab ( noteBook, type, isActive )
 
     let columnNumbers = new Gtk.TreeViewColumn ( { title: _("Column") } );
     let rendererNumbers = new Gtk.CellRendererText ( { editable: true } );
+    if ( this.gtkVersion == 4 )
         columnNumbers.append(rendererNumbers, true);
+    else
+        columnNumbers.pack_start(rendererNumbers, true);
     columnNumbers.add_attribute(rendererNumbers, 'text', 0);
     _treeView.append_column(columnNumbers);
 
     let _colSize = new Gtk.TreeViewColumn ( { title: _("Size") } );
     let _colRenderer = new Gtk.CellRendererText ( { editable: true } );
+    if ( this.gtkVersion == 4 )
         _colSize.append(_colRenderer, true);
+    else
+        _colSize.pack_start(_colRenderer, true);
     _colSize.add_attribute(_colRenderer, 'text', 1);
     _treeView.append_column(_colSize);
 
@@ -446,9 +476,18 @@ function addAccountLine ( server_id )
 				   hexpand: true,
 //				   margin: 5,
 				   halign: Gtk.Align.START } );
+    if ( this.gtkVersion == 4 )
+    {
         row.set_child ( _label );
         this.accountsChooser.append ( row );
-    this.accountsChooser.show_all(); // XXX Does not work in gtk4 ?
+    }
+    else
+    {
+        _label.margin = 5;
+        row.add ( _label );
+        this.accountsChooser.add ( row );
+        this.accountsChooser.show_all();
+    }
 }