util/window/form: add a theme selector

add a widget that implements a theme selector and sets a cookie to
load the appropriate theme.

Co-authored-by: Daniel Tschlatscher <d.tschlatscher@proxmox.com>
Co-authored-by: Stefan Sterz <s.sterz@proxmox.com>
Signed-off-by: Daniel Tschlatscher <d.tschlatscher@proxmox.com>
Signed-off-by: Stefan Sterz <s.sterz@proxmox.com>

src/Makefile

@@ -44,6 +44,7 @@ JSSRC=					\
 	form/TaskTypeSelector.js	\
 	form/ACME.js			\
 	form/UserSelector.js		\
+	form/ThemeSelector.js		\
 	button/Button.js		\
 	button/AltText.js		\
 	button/HelpButton.js		\
@@ -90,6 +91,7 @@ JSSRC=					\
 	window/AddYubico.js		\
 	window/TfaEdit.js		\
 	window/NotesEdit.js		\
+	window/ThemeEdit.js		\
 	node/APT.js			\
 	node/APTRepositories.js		\
 	node/NetworkEdit.js		\

src/Utils.js

@@ -109,6 +109,31 @@ utilities: {
 	return data;
     },
 
+    theme_map: {
+	auto: 'auto',
+	"proxmox-dark": 'Proxmox Dark',
+    },
+
+    render_theme: function(value) {
+	if (!value || value === '__default__') {
+	    return Proxmox.Utils.defaultText + ' (Light theme)';
+	}
+	let text = Proxmox.Utils.theme_map[value];
+	if (text) {
+	    return text;
+	}
+	return value;
+    },
+
+    theme_array: function() {
+	let data = [['__default__', Proxmox.Utils.render_theme('')]];
+	Ext.Object.each(Proxmox.Utils.theme_map, function(key, value) {
+	    data.push([key, Proxmox.Utils.render_theme(value)]);
+	});
+
+	return data;
+    },
+
     bond_mode_gettext_map: {
 	'802.3ad': 'LACP (802.3ad)',
 	'lacp-balance-slb': 'LACP (balance-slb)',

src/form/ThemeSelector.js

@@ -0,0 +1,6 @@
+Ext.define('Proxmox.form.ThemeSelector', {
+    extend: 'Proxmox.form.KVComboBox',
+    xtype: 'proxmoxThemeSelector',
+
+    comboItems: Proxmox.Utils.theme_array(),
+});

src/window/ThemeEdit.js

@@ -0,0 +1,49 @@
+Ext.define('Proxmox.window.ThemeEditWindow', {
+    extend: 'Ext.window.Window',
+    alias: 'widget.pmxThemeEditWindow',
+
+    viewModel: {
+	parent: null,
+	data: {
+	    language: '__default__',
+	},
+    },
+    controller: {
+	xclass: 'Ext.app.ViewController',
+	init: function(view) {
+	    let theme = Ext.util.Cookies.get(view.cookieName) || '__default__';
+	    this.getViewModel().set('theme', theme);
+	},
+	applyTheme: function(button) {
+	    let view = this.getView();
+	    let vm = this.getViewModel();
+
+	    let expire = Ext.Date.add(new Date(), Ext.Date.YEAR, 10);
+	    Ext.util.Cookies.set(view.cookieName, vm.get('theme'), expire);
+	    view.mask(gettext('Please wait...'), 'x-mask-loading');
+	    window.location.reload();
+	},
+    },
+
+    cookieName: 'PVEThemeCookie',
+
+    title: gettext('Theme'),
+    modal: true,
+    bodyPadding: 10,
+    resizable: false,
+    items: [
+	{
+	    xtype: 'proxmoxThemeSelector',
+	    fieldLabel: gettext('Theme'),
+	    bind: {
+		value: '{theme}',
+	    },
+	},
+    ],
+    buttons: [
+	{
+	    text: gettext('Apply'),
+	    handler: 'applyTheme',
+	},
+    ],
+});