Replace display selection dropdowns with visual display picker lightbox

Remove the Displays tab and replace <select> dropdowns in stream and
template test modals with a lightbox overlay showing the spatial display
layout. Clicking a display selects it. Uses percentage-based positioning
so the layout always fits its container.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/static/app.js

@@ -56,11 +56,125 @@ function closeLightbox(event) {
 }
 
 document.addEventListener('keydown', (e) => {
-    if (e.key === 'Escape' && document.getElementById('image-lightbox').classList.contains('active')) {
+    if (e.key === 'Escape') {
-        closeLightbox();
+        if (document.getElementById('display-picker-lightbox').classList.contains('active')) {
+            closeDisplayPicker();
+        } else if (document.getElementById('image-lightbox').classList.contains('active')) {
+            closeLightbox();
+        }
     }
 });
 
+// Display picker lightbox
+let _displayPickerCallback = null;
+
+function openDisplayPicker(callback) {
+    _displayPickerCallback = callback;
+    const lightbox = document.getElementById('display-picker-lightbox');
+    const canvas = document.getElementById('display-picker-canvas');
+
+    lightbox.classList.add('active');
+
+    // Defer render to next frame so the lightbox has been laid out and canvas has dimensions
+    requestAnimationFrame(() => {
+        if (_cachedDisplays && _cachedDisplays.length > 0) {
+            renderDisplayPickerLayout(_cachedDisplays);
+        } else {
+            canvas.innerHTML = '<div class="loading-spinner"></div>';
+            loadDisplays().then(() => {
+                if (_cachedDisplays && _cachedDisplays.length > 0) {
+                    renderDisplayPickerLayout(_cachedDisplays);
+                } else {
+                    canvas.innerHTML = `<div class="loading">${t('displays.none')}</div>`;
+                }
+            });
+        }
+    });
+}
+
+function closeDisplayPicker(event) {
+    if (event && event.target && event.target.closest('.display-picker-content')) return;
+    const lightbox = document.getElementById('display-picker-lightbox');
+    lightbox.classList.remove('active');
+    _displayPickerCallback = null;
+}
+
+function selectDisplay(displayIndex) {
+    if (_displayPickerCallback) {
+        const display = _cachedDisplays ? _cachedDisplays.find(d => d.index === displayIndex) : null;
+        _displayPickerCallback(displayIndex, display);
+    }
+    closeDisplayPicker();
+}
+
+function renderDisplayPickerLayout(displays) {
+    const canvas = document.getElementById('display-picker-canvas');
+
+    if (!displays || displays.length === 0) {
+        canvas.innerHTML = `<div class="loading">${t('displays.none')}</div>`;
+        return;
+    }
+
+    let minX = Infinity, minY = Infinity, maxX = -Infinity, maxY = -Infinity;
+    displays.forEach(display => {
+        minX = Math.min(minX, display.x);
+        minY = Math.min(minY, display.y);
+        maxX = Math.max(maxX, display.x + display.width);
+        maxY = Math.max(maxY, display.y + display.height);
+    });
+
+    const totalWidth = maxX - minX;
+    const totalHeight = maxY - minY;
+    const aspect = totalHeight / totalWidth;
+
+    // Use percentage-based positioning so layout always fits its container
+    const displayElements = displays.map(display => {
+        const leftPct = ((display.x - minX) / totalWidth) * 100;
+        const topPct = ((display.y - minY) / totalHeight) * 100;
+        const widthPct = (display.width / totalWidth) * 100;
+        const heightPct = (display.height / totalHeight) * 100;
+
+        return `
+            <div class="layout-display layout-display-pickable ${display.is_primary ? 'primary' : 'secondary'}"
+                 style="left: ${leftPct}%; top: ${topPct}%; width: ${widthPct}%; height: ${heightPct}%;"
+                 onclick="selectDisplay(${display.index})"
+                 title="${t('displays.picker.click_to_select')}">
+                <div class="layout-position-label">(${display.x}, ${display.y})</div>
+                <div class="layout-index-label">#${display.index}</div>
+                <div class="layout-display-label">
+                    <strong>${display.name}</strong>
+                    <small>${display.width}×${display.height}</small>
+                    <small>${display.refresh_rate}Hz</small>
+                </div>
+                ${display.is_primary ? '<div class="primary-indicator">★</div>' : ''}
+            </div>
+        `;
+    }).join('');
+
+    canvas.innerHTML = `
+        <div class="layout-container" style="width: 100%; padding-bottom: ${aspect * 100}%; position: relative;">
+            ${displayElements}
+        </div>
+    `;
+}
+
+function formatDisplayLabel(displayIndex, display) {
+    if (display) {
+        return `#${display.index}: ${display.width}×${display.height}${display.is_primary ? ' (' + t('displays.badge.primary') + ')' : ''}`;
+    }
+    return `Display ${displayIndex}`;
+}
+
+function onStreamDisplaySelected(displayIndex, display) {
+    document.getElementById('stream-display-index').value = displayIndex;
+    document.getElementById('stream-display-picker-label').textContent = formatDisplayLabel(displayIndex, display);
+}
+
+function onTestDisplaySelected(displayIndex, display) {
+    document.getElementById('test-template-display').value = displayIndex;
+    document.getElementById('test-display-picker-label').textContent = formatDisplayLabel(displayIndex, display);
+}
+
 // Locale management
 let currentLocale = 'en';
 let translations = {};
@@ -346,23 +460,11 @@ async function loadDisplays() {
 
         const data = await response.json();
 
-        const container = document.getElementById('displays-list');
+        if (data.displays && data.displays.length > 0) {
-
+            _cachedDisplays = data.displays;
-        if (!data.displays || data.displays.length === 0) {
-            container.innerHTML = `<div class="loading">${t('displays.none')}</div>`;
-            document.getElementById('display-layout-canvas').innerHTML = `<div class="loading">${t('displays.none')}</div>`;
-            return;
         }
-
-        // Cache and render visual layout
-        _cachedDisplays = data.displays;
-        renderDisplayLayout(data.displays);
     } catch (error) {
         console.error('Failed to load displays:', error);
-        document.getElementById('displays-list').innerHTML =
-            `<div class="loading">${t('displays.failed')}</div>`;
-        document.getElementById('display-layout-canvas').innerHTML =
-            `<div class="loading">${t('displays.failed')}</div>`;
     }
 }
 
@@ -372,9 +474,6 @@ function switchTab(name) {
     document.querySelectorAll('.tab-btn').forEach(btn => btn.classList.toggle('active', btn.dataset.tab === name));
     document.querySelectorAll('.tab-panel').forEach(panel => panel.classList.toggle('active', panel.id === `tab-${name}`));
     localStorage.setItem('activeTab', name);
-    if (name === 'displays' && _cachedDisplays) {
-        requestAnimationFrame(() => renderDisplayLayout(_cachedDisplays));
-    }
     if (name === 'templates') {
         loadCaptureTemplates();
     }
@@ -393,66 +492,6 @@ function initTabs() {
     }
 }
 
-function renderDisplayLayout(displays) {
-    const canvas = document.getElementById('display-layout-canvas');
-
-    if (!displays || displays.length === 0) {
-        canvas.innerHTML = `<div class="loading">${t('displays.none')}</div>`;
-        return;
-    }
-
-    // Calculate bounding box for all displays
-    let minX = Infinity, minY = Infinity, maxX = -Infinity, maxY = -Infinity;
-
-    displays.forEach(display => {
-        minX = Math.min(minX, display.x);
-        minY = Math.min(minY, display.y);
-        maxX = Math.max(maxX, display.x + display.width);
-        maxY = Math.max(maxY, display.y + display.height);
-    });
-
-    const totalWidth = maxX - minX;
-    const totalHeight = maxY - minY;
-
-    // Scale factor to fit in canvas (respect available width, maintain aspect ratio)
-    const availableWidth = canvas.clientWidth - 60; // account for padding
-    const maxCanvasHeight = 350;
-    const scaleX = availableWidth / totalWidth;
-    const scaleY = maxCanvasHeight / totalHeight;
-    const scale = Math.min(scaleX, scaleY);
-
-    const canvasWidth = totalWidth * scale;
-    const canvasHeight = totalHeight * scale;
-
-    // Create display elements
-    const displayElements = displays.map(display => {
-        const left = (display.x - minX) * scale;
-        const top = (display.y - minY) * scale;
-        const width = display.width * scale;
-        const height = display.height * scale;
-
-        return `
-            <div class="layout-display ${display.is_primary ? 'primary' : 'secondary'}"
-                 style="left: ${left}px; top: ${top}px; width: ${width}px; height: ${height}px;"
-                 title="${display.name}\n${display.width}×${display.height}\nPosition: (${display.x}, ${display.y})">
-                <div class="layout-position-label">(${display.x}, ${display.y})</div>
-                <div class="layout-index-label">#${display.index}</div>
-                <div class="layout-display-label">
-                    <strong>${display.name}</strong>
-                    <small>${display.width}×${display.height}</small>
-                    <small>${display.refresh_rate}Hz</small>
-                </div>
-                ${display.is_primary ? '<div class="primary-indicator">★</div>' : ''}
-            </div>
-        `;
-    }).join('');
-
-    canvas.innerHTML = `
-        <div class="layout-container" style="width: ${canvasWidth}px; height: ${canvasHeight}px; margin: 0 auto; position: relative;">
-            ${displayElements}
-        </div>
-    `;
-}
 
 // Load devices
 async function loadDevices() {
@@ -2815,33 +2854,31 @@ function collectEngineConfig() {
 // Load displays for test selector
 async function loadDisplaysForTest() {
     try {
-        const response = await fetchWithAuth('/config/displays');
+        if (!_cachedDisplays) {
-        if (!response.ok) {
+            const response = await fetchWithAuth('/config/displays');
-            throw new Error(`Failed to load displays: ${response.status}`);
+            if (!response.ok) throw new Error(`Failed to load displays: ${response.status}`);
+            const displaysData = await response.json();
+            _cachedDisplays = displaysData.displays || [];
         }
 
-        const displaysData = await response.json();
-        const select = document.getElementById('test-template-display');
-        select.innerHTML = '';
-
-        let primaryIndex = null;
-        (displaysData.displays || []).forEach(display => {
-            const option = document.createElement('option');
-            option.value = display.index;
-            option.textContent = `Display ${display.index} (${display.width}x${display.height})`;
-            if (display.is_primary) {
-                option.textContent += ' ★';
-                primaryIndex = display.index;
-            }
-            select.appendChild(option);
-        });
-
         // Auto-select: last used display, or primary as fallback
+        let selectedIndex = null;
         const lastDisplay = localStorage.getItem('lastTestDisplayIndex');
-        if (lastDisplay !== null && select.querySelector(`option[value="${lastDisplay}"]`)) {
+
-            select.value = lastDisplay;
+        if (lastDisplay !== null) {
-        } else if (primaryIndex !== null) {
+            const found = _cachedDisplays.find(d => d.index === parseInt(lastDisplay));
-            select.value = String(primaryIndex);
+            if (found) selectedIndex = found.index;
+        }
+
+        if (selectedIndex === null) {
+            const primary = _cachedDisplays.find(d => d.is_primary);
+            if (primary) selectedIndex = primary.index;
+            else if (_cachedDisplays.length > 0) selectedIndex = _cachedDisplays[0].index;
+        }
+
+        if (selectedIndex !== null) {
+            const display = _cachedDisplays.find(d => d.index === selectedIndex);
+            onTestDisplaySelected(selectedIndex, display);
         }
     } catch (error) {
         console.error('Error loading displays:', error);
@@ -3147,6 +3184,8 @@ async function showAddStreamModal(presetType) {
     document.getElementById('stream-modal-title').textContent = t(titleKey);
     document.getElementById('stream-form').reset();
     document.getElementById('stream-id').value = '';
+    document.getElementById('stream-display-index').value = '';
+    document.getElementById('stream-display-picker-label').textContent = t('displays.picker.select');
     document.getElementById('stream-error').style.display = 'none';
     document.getElementById('stream-type').value = streamType;
     onStreamTypeChange();
@@ -3181,7 +3220,9 @@ async function editStream(streamId) {
         await populateStreamModalDropdowns();
 
         if (stream.stream_type === 'raw') {
-            document.getElementById('stream-display-index').value = String(stream.display_index ?? 0);
+            const displayIdx = stream.display_index ?? 0;
+            const display = _cachedDisplays ? _cachedDisplays.find(d => d.index === displayIdx) : null;
+            onStreamDisplaySelected(displayIdx, display);
             document.getElementById('stream-capture-template').value = stream.capture_template_id || '';
             const fps = stream.target_fps ?? 30;
             document.getElementById('stream-target-fps').value = fps;
@@ -3210,23 +3251,16 @@ async function populateStreamModalDropdowns() {
         fetchWithAuth('/postprocessing-templates'),
     ]);
 
-    // Displays
+    // Displays - warm cache for display picker
-    const displaySelect = document.getElementById('stream-display-index');
-    displaySelect.innerHTML = '';
     if (displaysRes.ok) {
         const displaysData = await displaysRes.json();
-        (displaysData.displays || []).forEach(d => {
+        _cachedDisplays = displaysData.displays || [];
-            const opt = document.createElement('option');
-            opt.value = d.index;
-            opt.textContent = `${d.index}: ${d.width}x${d.height}${d.is_primary ? ` (${t('displays.badge.primary')})` : ''}`;
-            displaySelect.appendChild(opt);
-        });
     }
-    if (displaySelect.options.length === 0) {
+
-        const opt = document.createElement('option');
+    // Auto-select primary display if none selected yet
-        opt.value = '0';
+    if (!document.getElementById('stream-display-index').value && _cachedDisplays && _cachedDisplays.length > 0) {
-        opt.textContent = '0';
+        const primary = _cachedDisplays.find(d => d.is_primary) || _cachedDisplays[0];
-        displaySelect.appendChild(opt);
+        onStreamDisplaySelected(primary.index, primary);
     }
 
     // Capture templates

server/src/wled_controller/static/index.html

@@ -35,7 +35,7 @@
         <div class="tabs">
             <div class="tab-bar">
                 <button class="tab-btn active" data-tab="devices" onclick="switchTab('devices')"><span data-i18n="devices.title">💡 Devices</span></button>
-                <button class="tab-btn" data-tab="displays" onclick="switchTab('displays')"><span data-i18n="displays.layout">🖥️ Displays</span></button>
+
                 <button class="tab-btn" data-tab="streams" onclick="switchTab('streams')"><span data-i18n="streams.title">📺 Picture Streams</span></button>
                 <button class="tab-btn" data-tab="templates" onclick="switchTab('templates')"><span data-i18n="templates.title">🎯 Capture Templates</span></button>
                 <button class="tab-btn" data-tab="pp-templates" onclick="switchTab('pp-templates')"><span data-i18n="postprocessing.title">🎨 Processing Templates</span></button>
@@ -55,14 +55,6 @@
                 </div>
             </div>
 
-            <div class="tab-panel" id="tab-displays">
-                <div class="display-layout-preview">
-                    <div id="display-layout-canvas" class="display-layout-canvas">
-                        <div class="loading-spinner"></div>
-                    </div>
-                </div>
-                <div id="displays-list" style="display: none;"></div>
-            </div>
 
             <div class="tab-panel" id="tab-streams">
                 <p class="section-tip">
@@ -451,10 +443,11 @@
             </div>
             <div class="modal-body">
                 <div class="form-group">
-                    <label for="test-template-display" data-i18n="templates.test.display">Display:</label>
+                    <label data-i18n="templates.test.display">Display:</label>
-                    <select id="test-template-display">
+                    <input type="hidden" id="test-template-display" value="">
-                        <option value="" data-i18n="templates.test.display.select">Select display...</option>
+                    <button type="button" class="btn btn-display-picker" id="test-display-picker-btn" onclick="openDisplayPicker(onTestDisplaySelected)">
-                    </select>
+                        <span id="test-display-picker-label" data-i18n="displays.picker.select">Select display...</span>
+                    </button>
                 </div>
 
                 <div class="form-group">
@@ -517,8 +510,11 @@
                     <!-- Raw stream fields -->
                     <div id="stream-raw-fields">
                         <div class="form-group">
-                            <label for="stream-display-index" data-i18n="streams.display">Display:</label>
+                            <label data-i18n="streams.display">Display:</label>
-                            <select id="stream-display-index"></select>
+                            <input type="hidden" id="stream-display-index" value="">
+                            <button type="button" class="btn btn-display-picker" id="stream-display-picker-btn" onclick="openDisplayPicker(onStreamDisplaySelected)">
+                                <span id="stream-display-picker-label" data-i18n="displays.picker.select">Select display...</span>
+                            </button>
                         </div>
                         <div class="form-group">
                             <label for="stream-capture-template" data-i18n="streams.capture_template">Capture Template:</label>
@@ -627,6 +623,17 @@
         </div>
     </div>
 
+    <!-- Display Picker Lightbox -->
+    <div id="display-picker-lightbox" class="lightbox" onclick="closeDisplayPicker(event)">
+        <button class="lightbox-close" onclick="closeDisplayPicker()" title="Close">&#x2715;</button>
+        <div class="lightbox-content display-picker-content">
+            <h3 class="display-picker-title" data-i18n="displays.picker.title">Select a Display</h3>
+            <div id="display-picker-canvas" class="display-picker-canvas">
+                <div class="loading-spinner"></div>
+            </div>
+        </div>
+    </div>
+
     <script src="/static/app.js"></script>
     <script>
         // Initialize theme
@@ -682,7 +689,6 @@
 
             // Clear the UI
             document.getElementById('devices-list').innerHTML = `<div class="loading">${t('auth.please_login')} devices</div>`;
-            document.getElementById('displays-list').innerHTML = `<div class="loading">${t('auth.please_login')} displays</div>`;
         }
 
         // Initialize on load

server/src/wled_controller/static/locales/en.json

@@ -32,6 +32,9 @@
   "displays.loading": "Loading displays...",
   "displays.none": "No displays available",
   "displays.failed": "Failed to load displays",
+  "displays.picker.title": "Select a Display",
+  "displays.picker.select": "Select display...",
+  "displays.picker.click_to_select": "Click to select this display",
   "templates.title": "\uD83C\uDFAF Capture Templates",
   "templates.description": "Capture templates define how the screen is captured. Each template uses a specific capture engine (MSS, DXcam, WGC) with custom settings. Assign templates to devices for optimal performance.",
   "templates.loading": "Loading templates...",

server/src/wled_controller/static/locales/ru.json

@@ -32,6 +32,9 @@
   "displays.loading": "Загрузка дисплеев...",
   "displays.none": "Нет доступных дисплеев",
   "displays.failed": "Не удалось загрузить дисплеи",
+  "displays.picker.title": "Выберите Дисплей",
+  "displays.picker.select": "Выберите дисплей...",
+  "displays.picker.click_to_select": "Нажмите, чтобы выбрать этот дисплей",
   "templates.title": "\uD83C\uDFAF Шаблоны Захвата",
   "templates.description": "Шаблоны захвата определяют, как захватывается экран. Каждый шаблон использует определённый движок захвата (MSS, DXcam, WGC) с настраиваемыми параметрами. Назначайте шаблоны устройствам для оптимальной производительности.",
   "templates.loading": "Загрузка шаблонов...",

server/src/wled_controller/static/style.css

@@ -487,32 +487,6 @@ section {
 }
 
 /* Display Layout Visualization */
-.display-layout-preview {
-    background: var(--card-bg);
-    border: 1px solid var(--border-color);
-    border-radius: 8px;
-    padding: 20px;
-    margin-bottom: 20px;
-}
-
-.display-layout-preview h3 {
-    margin: 0 0 15px 0;
-    font-size: 1.1rem;
-    color: var(--text-color);
-}
-
-.display-layout-canvas {
-    background: var(--bg-color);
-    border: 2px dashed var(--border-color);
-    border-radius: 8px;
-    padding: 30px;
-    min-height: 280px;
-    display: flex;
-    align-items: center;
-    justify-content: center;
-    overflow: hidden;
-}
-
 .layout-container {
     position: relative;
     background: transparent;
@@ -527,12 +501,10 @@ section {
     align-items: center;
     justify-content: center;
     box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
-    transition: transform 0.2s, box-shadow 0.2s;
+    transition: box-shadow 0.2s, border-color 0.2s;
-    cursor: help;
 }
 
 .layout-display:hover {
-    transform: scale(1.05);
     box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
     z-index: 10;
 }
@@ -597,39 +569,6 @@ section {
     text-shadow: 0 0 4px rgba(0, 0, 0, 0.4);
 }
 
-.layout-legend {
-    display: flex;
-    gap: 20px;
-    justify-content: center;
-    margin-top: 15px;
-    padding-top: 15px;
-    border-top: 1px solid var(--border-color);
-}
-
-.legend-item {
-    display: flex;
-    align-items: center;
-    gap: 8px;
-    font-size: 0.9rem;
-    color: var(--text-secondary);
-}
-
-.legend-dot {
-    width: 16px;
-    height: 16px;
-    border-radius: 3px;
-    border: 2px solid;
-}
-
-.legend-dot.primary {
-    border-color: var(--primary-color);
-    background: rgba(76, 175, 80, 0.2);
-}
-
-.legend-dot.secondary {
-    border-color: var(--border-color);
-    background: rgba(128, 128, 128, 0.2);
-}
 
 /* Card brightness slider */
 .brightness-control {
@@ -2327,6 +2266,58 @@ input:-webkit-autofill:focus {
     font-weight: 600;
 }
 
+/* Display Picker Lightbox */
+.display-picker-content {
+    max-width: 900px;
+    width: 90%;
+    text-align: center;
+}
+
+.display-picker-title {
+    color: white;
+    font-size: 1.3rem;
+    margin-bottom: 20px;
+    font-weight: 500;
+}
+
+.display-picker-canvas {
+    background: rgba(255, 255, 255, 0.05);
+    border: 2px dashed rgba(255, 255, 255, 0.15);
+    border-radius: 8px;
+    padding: 24px;
+    width: 100%;
+    box-sizing: border-box;
+}
+
+.layout-display-pickable {
+    cursor: pointer !important;
+}
+
+.layout-display-pickable:hover {
+    box-shadow: 0 0 20px rgba(76, 175, 80, 0.4);
+    border-color: var(--primary-color) !important;
+}
+
+/* Display picker button in forms */
+.btn-display-picker {
+    width: 100%;
+    padding: 10px;
+    border: 1px solid var(--border-color);
+    border-radius: 4px;
+    background: var(--bg-color);
+    color: var(--text-color);
+    font-size: 1rem;
+    cursor: pointer;
+    text-align: left;
+    transition: border-color 0.2s, box-shadow 0.2s;
+    font-weight: 400;
+}
+
+.btn-display-picker:hover {
+    border-color: var(--primary-color);
+    box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.15);
+}
+
 /* Responsive adjustments */
 @media (max-width: 768px) {
     .templates-grid {