feat: remove color validation in appearance admin page & add color indicator (#3140)

* Remove color validation in basics admin page & add color indicator

* Create ColorInput common component

* Revert 'formGroupAttrs' addition

* Rename component CSS classes

* Fix input type in ColorInput from AdminPage#buildSettingComponent

* Rename component to ColorPreviewInput, remove aliases in admin & export in compat

* Remove leftovers from rebase on master

* feat: add global type definition for a vnode element tag

* fix(a11y): add aria roles to color input

* chore: use new type

* chore: format

Co-authored-by: David Wheatley <hi@davwheat.dev>

js/src/@types/global.d.ts

@@ -21,6 +21,8 @@ declare type KeysOfType<Type extends object, Match> = {
  */
 declare type KeyOfType<Type extends object, Match> = KeysOfType<Type, Match>[keyof Type];
 
+declare type VnodeElementTag<Attrs = Record<string, unknown>, State = Record<string, unknown>> = string | ComponentTypes<Attrs, State>;
+
 /**
  * @deprecated Please import `app` from a namespace instead of using it as a global variable.
  *

js/src/admin/components/AdminPage.tsx

@@ -10,6 +10,7 @@ import Stream from '../../common/utils/Stream';
 import saveSettings from '../utils/saveSettings';
 import AdminHeader from './AdminHeader';
 import generateElementId from '../utils/generateElementId';
+import ColorPreviewInput from '../../common/components/ColorPreviewInput';
 
 export interface AdminHeaderOptions {
   title: string;
@@ -76,6 +77,7 @@ export interface HTMLInputSettingsComponentOptions extends CommonSettingsItemOpt
 const BooleanSettingTypes = ['bool', 'checkbox', 'switch', 'boolean'] as const;
 const SelectSettingTypes = ['select', 'dropdown', 'selectdropdown'] as const;
 const TextareaSettingTypes = ['textarea'] as const;
+const ColorPreviewSettingType = 'color-preview';
 
 /**
  * Valid options for the setting component builder to generate a Switch.
@@ -103,6 +105,13 @@ export interface TextareaSettingComponentOptions extends CommonSettingsItemOptio
   type: typeof TextareaSettingTypes[number];
 }
 
+/**
+ * Valid options for the setting component builder to generate a ColorPreviewInput.
+ */
+export interface ColorPreviewSettingComponentOptions extends CommonSettingsItemOptions {
+  type: typeof ColorPreviewSettingType;
+}
+
 /**
  * All valid options for the setting component builder.
  */
@@ -110,7 +119,8 @@ export type SettingsComponentOptions =
   | HTMLInputSettingsComponentOptions
   | SwitchSettingComponentOptions
   | SelectSettingComponentOptions
-  | TextareaSettingComponentOptions;
+  | TextareaSettingComponentOptions
+  | ColorPreviewSettingComponentOptions;
 
 /**
  * Valid attrs that can be returned by the `headerInfo` function
@@ -258,7 +268,15 @@ export default abstract class AdminPage<CustomAttrs extends IPageAttrs = IPageAt
       if ((TextareaSettingTypes as readonly string[]).includes(type)) {
         settingElement = <textarea id={inputId} aria-describedby={helpTextId} bidi={this.setting(setting)} {...componentAttrs} />;
       } else {
-        settingElement = <input id={inputId} aria-describedby={helpTextId} type={type} bidi={this.setting(setting)} {...componentAttrs} />;
+        let Tag: VnodeElementTag = 'input';
+
+        if (type === ColorPreviewSettingType) {
+          Tag = ColorPreviewInput;
+        } else {
+          componentAttrs.type = type;
+        }
+
+        settingElement = <Tag id={inputId} aria-describedby={helpTextId} bidi={this.setting(setting)} {...componentAttrs} />;
       }
     }
 

js/src/admin/components/AppearancePage.js

@@ -25,12 +25,12 @@ export default class AppearancePage extends AdminPage {
 
           <div className="AppearancePage-colors-input">
             {this.buildSettingComponent({
-              type: 'text',
+              type: 'color-preview',
               setting: 'theme_primary_color',
               placeholder: '#aaaaaa',
             })}
             {this.buildSettingComponent({
-              type: 'text',
+              type: 'color-preview',
               setting: 'theme_secondary_color',
               placeholder: '#aaaaaa',
             })}
@@ -105,17 +105,4 @@ export default class AppearancePage extends AdminPage {
   onsaved() {
     window.location.reload();
   }
-
-  saveSettings(e) {
-    e.preventDefault();
-
-    const hex = /^#[0-9a-f]{3}([0-9a-f]{3})?$/i;
-
-    if (!hex.test(this.settings['theme_primary_color']()) || !hex.test(this.settings['theme_secondary_color']())) {
-      alert(app.translator.trans('core.admin.appearance.enter_hex_message'));
-      return;
-    }
-
-    super.saveSettings(e);
-  }
 }

js/src/common/compat.js

@@ -57,6 +57,7 @@ import Alert from './components/Alert';
 import Link from './components/Link';
 import LinkButton from './components/LinkButton';
 import Checkbox from './components/Checkbox';
+import ColorPreviewInput from './components/ColorPreviewInput';
 import SelectDropdown from './components/SelectDropdown';
 import ModalManager from './components/ModalManager';
 import Button from './components/Button';
@@ -144,6 +145,7 @@ export default {
   'components/Link': Link,
   'components/LinkButton': LinkButton,
   'components/Checkbox': Checkbox,
+  'components/ColorPreviewInput': ColorPreviewInput,
   'components/SelectDropdown': SelectDropdown,
   'components/ModalManager': ModalManager,
   'components/Button': Button,

js/src/common/components/ColorPreviewInput.tsx

@@ -0,0 +1,28 @@
+import type Mithril from 'mithril';
+
+import Component, { ComponentAttrs } from '../Component';
+import classList from '../utils/classList';
+import icon from '../helpers/icon';
+
+export default class ColorPreviewInput extends Component {
+  value?: string;
+
+  view(vnode: Mithril.Vnode<ComponentAttrs, this>) {
+    const { className, ...attrs } = this.attrs;
+    const value = attrs.bidi?.() || attrs.value;
+
+    attrs.type ||= 'text';
+
+    return (
+      <div className="ColorInput">
+        <input className={classList('FormControl', className)} {...attrs} />
+
+        <span className="ColorInput-icon" role="presentation">
+          {icon('fas fa-exclamation-circle')}
+        </span>
+
+        <div className="ColorInput-preview" style={{ '--input-value': value }} role="presentation" />
+      </div>
+    );
+  }
+}

less/admin/AppearancePage.less

@@ -23,14 +23,6 @@
     margin-bottom: 24px !important;
     margin-left: 10px;
   }
-
-  input {
-    float: left;
-
-    &:first-child {
-      margin-right: 2%;
-    }
-  }
 }
 
 .AppearancePage-colors .Checkbox {

less/common/ColorInput.less

@@ -0,0 +1,22 @@
+.ColorInput {
+  position: relative;
+
+  &-preview, &-icon {
+    position: absolute;
+    right: 8px;
+    bottom: 8px;
+    width: 20px;
+    height: 20px;
+    pointer-events: none;
+  }
+
+  &-preview {
+    background-color: var(--input-value);
+    border-radius: 15%;
+  }
+
+  &-icon {
+    text-align: center;
+    color: @validation-error-color;
+  }
+}

less/common/common.less

@@ -17,6 +17,7 @@
 @import "Badge";
 @import "Button";
 @import "Checkbox";
+@import "ColorInput";
 @import "Dropdown";
 @import "EditUserModal";
 @import "Form";