Add option to position first backdrop below nav bar

entry_types/scrolled/config/locales/de.yml

@@ -33,6 +33,15 @@ de:
                 sparen, wird die Navigation im Phone-Layout beim
                 Scrollen dennoch immer ausgeblendet.
               label: Im Desktop-Layout fixieren
+            firstBackdropBelowNavigation:
+              inline_help: |
+                Positioniert das Hintergrundbild der ersten Sektion
+                unterhalb der Navigationsleiste statt dahinter.
+              inline_help_disabled: |
+                Positioniert das Hintergrundbild der ersten Sektion
+                unterhalb der Navigationsleiste statt dahinter. Nur
+                verfügbar, wenn die Navigation fixiert ist.
+              label: Hintergrund unterhalb beginnen
             hideSharingButton:
               label: Share-Button ausblenden
             hideToggleMuteButton:

entry_types/scrolled/config/locales/en.yml

@@ -33,6 +33,15 @@ en:
                 navigation is still always hidden when the page is
                 scrolled in phone layout.
               label: Keep expanded in desktop layout
+            firstBackdropBelowNavigation:
+              inline_help: |
+                Position the first section's backdrop image below the
+                navigation bar instead of behind it.
+              inline_help_disabled: |
+                Position the first section's backdrop image below the
+                navigation bar instead of behind it. Only available
+                when navigation is set to stay expanded.
+              label: Start backdrop below
             hideSharingButton:
               label: Hide share button
             hideToggleMuteButton:

entry_types/scrolled/doc/creating_widget_types.md

@@ -284,3 +284,69 @@ entry_type_config.themes.register(:my_custom_theme,
                                     }
                                   }
 ```
+
+## Presence Providers
+
+When registering a widget type, you can pass a `PresenceProvider`
+component. When the widget is present in an entry, this component
+wraps the entry content. This allows widgets to define CSS custom
+properties that cascade down to sections and backdrops, and to provide
+React context that the widget component can consume.
+
+The `PresenceProvider` receives the widget's `configuration` and
+`children`:
+
+``` javascript
+frontend.widgetTypes.register('myNavigation', {
+  component: MyNavigation,
+  PresenceProvider: function({configuration, children}) {
+    const [expanded, setExpanded] = useState(true);
+
+    const className = classNames(styles.presence, {
+      [styles.expanded]: expanded
+    });
+
+    return (
+      <MyNavigationContext.Provider value={{expanded, setExpanded}}>
+        <div className={className}>
+          {children}
+        </div>
+      </MyNavigationContext.Provider>
+    );
+  }
+});
+```
+
+### Widget Margin Custom Properties
+
+Navigation widgets that are fixed at the top of the viewport can set
+the following CSS custom properties via a presence provider to ensure
+backdrops and full height sections are positioned correctly below the
+navigation bar:
+
+* `--widget-margin-top-max`: Maximum height the widget occupies. Used
+  to add padding to the first section so that content starts below the
+  navigation bar.
+
+* `--widget-margin-top-min`: Minimum height the widget occupies when
+  scrolled. Used to position sticky backdrops below the navigation bar
+  and to calculate the height of full viewport sections.
+
+For example, a navigation bar that is always visible could define:
+
+``` css
+.presence {
+  --widget-margin-top-max: 60px;
+  --widget-margin-top-min: 60px;
+}
+```
+
+A navigation bar that hides on scroll but keeps a progress bar visible
+could use different values:
+
+``` css
+.presence {
+  --widget-margin-top-max: 60px;
+  --widget-margin-top-min: 5px;
+}
+```

entry_types/scrolled/package/.storybook/preview-head.html.template

@@ -29,6 +29,10 @@
     bottom: 0;
     right: 0;
   }
+
+  :root {
+    --theme-widget-margin-top: 58px;
+  }
 </style>
 
 <script>

entry_types/scrolled/package/spec/entryState/widgets-spec.js

@@ -1,5 +1,6 @@
 import {
   useWidget,
+  useActiveWidgets,
   watchCollections
 } from 'entryState';
 
@@ -99,3 +100,42 @@ describe('useWidget', () => {
     expect(widget).toBeUndefined();
   });
 });
+
+describe('useActiveWidgets', () => {
+  it('returns widgets with typeName from seed', () => {
+    const {result} = renderHookInEntry(
+      () => useActiveWidgets(),
+      {
+        seed: {
+          widgets: [
+            {typeName: 'navWidget', role: 'header', configuration: {fixed: true}},
+            {typeName: 'footerWidget', role: 'footer', configuration: {}}
+          ]
+        }
+      }
+    );
+
+    expect(result.current).toMatchObject([
+      {typeName: 'navWidget', role: 'header', configuration: {fixed: true}},
+      {typeName: 'footerWidget', role: 'footer', configuration: {}}
+    ]);
+  });
+
+  it('filters out widgets with blank typeName', () => {
+    const {result} = renderHookInEntry(
+      () => useActiveWidgets(),
+      {
+        seed: {
+          widgets: [
+            {typeName: 'navWidget', role: 'header', configuration: {}},
+            {typeName: null, role: 'consent', configuration: {}}
+          ]
+        }
+      }
+    );
+
+    expect(result.current).toMatchObject([
+      {typeName: 'navWidget', role: 'header', configuration: {}}
+    ]);
+  });
+});

entry_types/scrolled/package/spec/frontend/features/widgetPresenceProvider-spec.js

@@ -0,0 +1,143 @@
+import React, {useContext, createContext} from 'react';
+
+import {frontend} from 'frontend';
+
+import {renderEntry, usePageObjects} from 'support/pageObjects';
+import '@testing-library/jest-dom/extend-expect'
+
+describe('widget PresenceProvider', () => {
+  usePageObjects();
+
+  it('wraps entry content with PresenceProvider component', () => {
+    frontend.widgetTypes.register('providerWidget', {
+      component: function() { return <div>Widget</div>; },
+      PresenceProvider: function({children}) {
+        return <div data-testid="presence-wrapper">{children}</div>;
+      }
+    });
+
+    const {getByTestId} = renderEntry({
+      seed: {
+        widgets: [{
+          typeName: 'providerWidget',
+          role: 'header'
+        }]
+      }
+    });
+
+    expect(getByTestId('presence-wrapper')).toBeInTheDocument();
+  });
+
+  it('does not render PresenceProvider when widget is not active', () => {
+    frontend.widgetTypes.register('providerWidget2', {
+      component: function() { return <div>Widget</div>; },
+      PresenceProvider: function({children}) {
+        return <div data-testid="presence-wrapper-2">{children}</div>;
+      }
+    });
+
+    const {queryByTestId} = renderEntry({
+      seed: {
+        widgets: []
+      }
+    });
+
+    expect(queryByTestId('presence-wrapper-2')).not.toBeInTheDocument();
+  });
+
+  it('passes configuration to PresenceProvider', () => {
+    frontend.widgetTypes.register('configuredProviderWidget', {
+      component: function() { return <div>Widget</div>; },
+      PresenceProvider: function({configuration, children}) {
+        return (
+          <div data-testid="configured-wrapper" data-fixed={String(configuration.fixed)}>
+            {children}
+          </div>
+        );
+      }
+    });
+
+    const {getByTestId} = renderEntry({
+      seed: {
+        widgets: [{
+          typeName: 'configuredProviderWidget',
+          role: 'header',
+          configuration: {fixed: true}
+        }]
+      }
+    });
+
+    expect(getByTestId('configured-wrapper')).toHaveAttribute('data-fixed', 'true');
+  });
+
+  it('nests multiple PresenceProviders when multiple widgets are active', () => {
+    frontend.widgetTypes.register('headerProviderWidget', {
+      component: function() { return <div>Header</div>; },
+      PresenceProvider: function({children}) {
+        return <div data-testid="header-wrapper">{children}</div>;
+      }
+    });
+
+    frontend.widgetTypes.register('footerProviderWidget', {
+      component: function() { return <div>Footer</div>; },
+      PresenceProvider: function({children}) {
+        return <div data-testid="footer-wrapper">{children}</div>;
+      }
+    });
+
+    const {getByTestId} = renderEntry({
+      seed: {
+        widgets: [
+          {typeName: 'headerProviderWidget', role: 'header'},
+          {typeName: 'footerProviderWidget', role: 'footer'}
+        ]
+      }
+    });
+
+    expect(getByTestId('header-wrapper')).toBeInTheDocument();
+    expect(getByTestId('footer-wrapper')).toBeInTheDocument();
+  });
+
+  it('allows PresenceProvider to provide context consumed by widget component', () => {
+    const TestContext = createContext(null);
+
+    frontend.widgetTypes.register('contextProviderWidget', {
+      component: function() {
+        const value = useContext(TestContext);
+        return <div data-testid="context-consumer">{value}</div>;
+      },
+      PresenceProvider: function({children}) {
+        return (
+          <TestContext.Provider value="from-presence">
+            {children}
+          </TestContext.Provider>
+        );
+      }
+    });
+
+    const {getByTestId} = renderEntry({
+      seed: {
+        widgets: [{
+          typeName: 'contextProviderWidget',
+          role: 'header'
+        }]
+      }
+    });
+
+    expect(getByTestId('context-consumer')).toHaveTextContent('from-presence');
+  });
+
+  it('does not fail when widget type has no PresenceProvider', () => {
+    frontend.widgetTypes.register('noProviderWidget', {
+      component: function() { return <div data-testid="no-provider">Simple</div>; }
+    });
+
+    const {getByTestId} = renderEntry({
+      seed: {
+        widgets: [{typeName: 'noProviderWidget', role: 'header'}]
+      }
+    });
+
+    expect(getByTestId('no-provider')).toBeInTheDocument();
+  });
+});

entry_types/scrolled/package/spec/support/pageObjects.js

@@ -19,10 +19,11 @@ import {act, fireEvent, queryHelpers, queries, within} from '@testing-library/re
 import {useFakeTranslations} from 'pageflow/testHelpers';
 import {simulateScrollingIntoView} from './fakeIntersectionObserver';
 
-export function renderEntry({seed, consent, isStaticPreview} = {}) {
+export function renderEntry({seed, consent, isStaticPreview, phonePlatform} = {}) {
   const result = renderInEntry(<Entry />, {
     seed,
     consent,
+    phonePlatform,
     wrapper: isStaticPreview ? StaticPreview : null,
     queries: {...queries, ...pageObjectQueries}
   });

entry_types/scrolled/package/spec/widgets/defaultNavigation/DefaultNavigation/styling-spec.js

@@ -2,16 +2,15 @@ import React from 'react';
 
 import {DefaultNavigation} from 'widgets/defaultNavigation/DefaultNavigation';
 
+import styles from 'widgets/defaultNavigation/DefaultNavigation.module.css';
+
 import {useFakeTranslations} from 'pageflow/testHelpers';
 import {renderInEntry} from 'pageflow-scrolled/testHelpers';
-import {act} from '@testing-library/react';
 import '@testing-library/jest-dom/extend-expect';
 
 describe('DefaultNavigation - Styling', () => {
   useFakeTranslations({});
 
-  afterEach(() => jest.restoreAllMocks());
-
   it('does not have style attribute on header by default', () => {
     const {container} = renderInEntry(
       <DefaultNavigation configuration={{}} />
@@ -30,40 +29,23 @@ describe('DefaultNavigation - Styling', () => {
     );
   });
 
-  it('toggles data-default-navigation-expanded attribute based on scroll direction', () => {
-    // Mock window.scrollY and getBoundingClientRect to simulate scroll positions
-    Object.defineProperty(window, 'scrollY', {
-      writable: true,
-      value: 0
-    });
-
-    jest.spyOn(document.body, 'getBoundingClientRect').mockImplementation(() => ({
-      top: -window.scrollY,
-      left: 0,
-      right: 1024,
-      bottom: 768 - window.scrollY,
-      width: 1024,
-      height: 768
-    }));
-
-    renderInEntry(
+  it('has translucent surface by default', () => {
+    const {container} = renderInEntry(
       <DefaultNavigation configuration={{}} />
     );
 
-    expect(document.documentElement).toHaveAttribute('data-default-navigation-expanded');
-
-    act(() => {
-      window.scrollY = 100;
-      window.dispatchEvent(new Event('scroll'));
-    });
-
-    expect(document.documentElement).not.toHaveAttribute('data-default-navigation-expanded');
+    const wrapper = container.querySelector('header > div');
+    expect(wrapper).toHaveClass(styles.translucentSurface);
+    expect(wrapper).not.toHaveClass(styles.opaqueSurface);
+  });
 
-    act(() => {
-      window.scrollY = 50;
-      window.dispatchEvent(new Event('scroll'));
-    });
+  it('has opaque surface when firstBackdropBelowNavigation is set', () => {
+    const {container} = renderInEntry(
+      <DefaultNavigation configuration={{firstBackdropBelowNavigation: true}} />
+    );
 
-    expect(document.documentElement).toHaveAttribute('data-default-navigation-expanded');
+    const wrapper = container.querySelector('header > div');
+    expect(wrapper).toHaveClass(styles.opaqueSurface);
+    expect(wrapper).not.toHaveClass(styles.translucentSurface);
   });
 });