feat(字幕): 添加字幕样式设置面板及拖拽缩放功能

添加字幕样式设置浮动面板，包含宽度、高度、字体大小等配置项
实现字幕容器的拖拽移动和缩放功能
添加字幕容器自动检测和初始化逻辑

frontend/scripts/main.js

@@ -56,7 +56,15 @@ const elements = {
     clearLogBtn: document.getElementById('clearLogBtn'),
     fullscreenBtn: document.getElementById('fullscreenBtn'),
     toggleConfigBtn: document.getElementById('toggleConfigBtn'),
+    toggleCaptionBtn: document.getElementById('toggleCaptionBtn'),
     toggleLogBtn: document.getElementById('toggleLogBtn'),
+    applyCaptionStyleBtn: document.getElementById('applyCaptionStyleBtn'),
+
+    captionWidth: document.getElementById('captionWidth'),
+    captionHeight: document.getElementById('captionHeight'),
+    captionFontSize: document.getElementById('captionFontSize'),
+    captionRight: document.getElementById('captionRight'),
+    captionBottom: document.getElementById('captionBottom'),
 
     logLevel: document.getElementById('logLevel'),
 
@@ -73,6 +81,7 @@ const fullscreenState = {
 
 const panelState = {
     configPanel: false,
+    captionPanel: false,
     logPanel: false
 };
 
@@ -200,6 +209,7 @@ function togglePanel(panelId) {
         
         const btnMap = {
             configPanel: 'toggleConfigBtn',
+            captionPanel: 'toggleCaptionBtn',
             logPanel: 'toggleLogBtn'
         };
         
@@ -338,6 +348,142 @@ function clearLogs() {
     logger.info('日志已清空');
 }
 
+function applyCaptionStyle() {
+    const width = elements.captionWidth.value;
+    const height = elements.captionHeight.value;
+    const fontSize = elements.captionFontSize.value;
+    const right = elements.captionRight.value;
+    const bottom = elements.captionBottom.value;
+
+    const captionContainer = document.querySelector('.caption-container-hub');
+    if (!captionContainer) {
+        logger.warn('字幕容器未找到');
+        return;
+    }
+
+    captionContainer.style.position = 'fixed';
+    captionContainer.style.width = `${width}px`;
+    captionContainer.style.height = `${height}px`;
+    captionContainer.style.maxHeight = `${height}px`;
+    captionContainer.style.right = `${right}px`;
+    captionContainer.style.bottom = `${bottom}px`;
+    captionContainer.style.fontSize = `${fontSize}px`;
+    captionContainer.style.borderRadius = '8px';
+    captionContainer.style.padding = '10px';
+    captionContainer.style.overflowY = 'auto';
+    captionContainer.style.cursor = 'move';
+    captionContainer.style.userSelect = 'none';
+    captionContainer.style.zIndex = '9999';
+
+    const textElements = captionContainer.querySelectorAll('*');
+    textElements.forEach(el => {
+        el.style.fontSize = `${fontSize}px`;
+    });
+
+    initCaptionDragAndResize(captionContainer);
+
+    logger.info('字幕容器样式已应用', { width, height, fontSize, right, bottom });
+}
+
+function initCaptionDragAndResize(container) {
+    container.dataset.dragInitialized = 'true';
+
+    let isDragging = false;
+    let isResizing = false;
+    let startX, startY, startRight, startBottom, startWidth, startHeight;
+
+    let resizeHandle = container.querySelector('.caption-resize-handle');
+    if (!resizeHandle) {
+        resizeHandle = document.createElement('div');
+        resizeHandle.className = 'caption-resize-handle';
+        resizeHandle.style.position = 'absolute';
+        resizeHandle.style.right = '0';
+        resizeHandle.style.bottom = '0';
+        resizeHandle.style.width = '20px';
+        resizeHandle.style.height = '20px';
+        resizeHandle.style.cursor = 'nwse-resize';
+        resizeHandle.style.background = 'linear-gradient(135deg, transparent 50%, rgba(255,255,255,0.5) 50%)';
+        resizeHandle.style.borderRadius = '0 0 8px 0';
+        resizeHandle.style.zIndex = '10000';
+        container.appendChild(resizeHandle);
+    }
+
+    container.onmousedown = (e) => {
+        if (e.target === resizeHandle || resizeHandle.contains(e.target)) return;
+        isDragging = true;
+        startX = e.clientX;
+        startY = e.clientY;
+        const rect = container.getBoundingClientRect();
+        startRight = window.innerWidth - rect.right;
+        startBottom = window.innerHeight - rect.bottom;
+        e.preventDefault();
+        e.stopPropagation();
+    };
+
+    resizeHandle.onmousedown = (e) => {
+        isResizing = true;
+        startX = e.clientX;
+        startY = e.clientY;
+        startWidth = container.offsetWidth;
+        startHeight = container.offsetHeight;
+        e.preventDefault();
+        e.stopPropagation();
+    };
+
+    document.onmousemove = (e) => {
+        if (!isDragging && !isResizing) return;
+        e.preventDefault();
+
+        if (isDragging) {
+            const dx = e.clientX - startX;
+            const dy = e.clientY - startY;
+            container.style.right = `${startRight - dx}px`;
+            container.style.bottom = `${startBottom + dy}px`;
+        }
+        if (isResizing) {
+            const dx = e.clientX - startX;
+            const dy = e.clientY - startY;
+            const newWidth = Math.max(200, startWidth + dx);
+            const newHeight = Math.max(100, startHeight + dy);
+            container.style.width = `${newWidth}px`;
+            container.style.height = `${newHeight}px`;
+            container.style.maxHeight = `${newHeight}px`;
+        }
+    };
+
+    document.onmouseup = () => {
+        isDragging = false;
+        isResizing = false;
+    };
+
+    logger.info('字幕容器拖拽和缩放已启用');
+}
+
+function watchCaptionContainer() {
+    const observer = new MutationObserver((mutations) => {
+        for (const mutation of mutations) {
+            if (mutation.type === 'childList') {
+                const captionContainer = document.querySelector('.caption-container-hub');
+                if (captionContainer && !captionContainer.dataset.dragInitialized) {
+                    logger.info('检测到字幕容器，自动启用拖拽功能');
+                    captionContainer.style.position = 'fixed';
+                    captionContainer.style.cursor = 'move';
+                    captionContainer.style.userSelect = 'none';
+                    captionContainer.style.zIndex = '9999';
+                    initCaptionDragAndResize(captionContainer);
+                }
+            }
+        }
+    });
+
+    observer.observe(document.body, {
+        childList: true,
+        subtree: true
+    });
+
+    logger.info('已启动字幕容器监听');
+}
+
 function calculateScale() {
     const container = elements.digitalHumanBox;
     const sdkContainer = container.querySelector('.digital-intelligent-interaction');
@@ -392,6 +538,7 @@ function bindEvents() {
     elements.initBtn.addEventListener('click', initializeSDK);
     elements.destroyBtn.addEventListener('click', destroySDK);
     elements.getOnceCodeBtn.addEventListener('click', handleGetOnceCode);
+    elements.applyCaptionStyleBtn.addEventListener('click', applyCaptionStyle);
 
     elements.clearLogBtn.addEventListener('click', clearLogs);
     elements.logLevel.addEventListener('change', () => {
@@ -402,6 +549,7 @@ function bindEvents() {
     });
 
     elements.toggleConfigBtn.addEventListener('click', () => togglePanel('configPanel'));
+    elements.toggleCaptionBtn.addEventListener('click', () => togglePanel('captionPanel'));
     elements.toggleLogBtn.addEventListener('click', () => togglePanel('logPanel'));
     elements.fullscreenBtn.addEventListener('click', toggleFullscreen);
 
@@ -434,6 +582,7 @@ function init() {
     bindEvents();
     updateUIState();
     initScaling();
+    watchCaptionContainer();
 }
 
 init();