517 lines
16 KiB
JavaScript
517 lines
16 KiB
JavaScript
// 极简邀请函制作工具
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(function() {
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const fileInput = document.getElementById('fileInput');
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const addImageBtn = document.getElementById('addImageBtn');
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const saveBtn = document.getElementById('saveBtn');
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const imageContainer = document.getElementById('imageContainer');
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const bgImage = document.getElementById('bgImage');
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const emptyTip = document.getElementById('emptyTip');
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const input1 = document.getElementById('input1');
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const input2 = document.getElementById('input2');
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const exportCanvas = document.getElementById('exportCanvas');
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const longPressTip = document.getElementById('longPressTip');
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const canvasArea = document.getElementById('canvasArea');
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let currentImage = null;
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let selectedInput = null;
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let editingInput = null;
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let longPressTimer = null;
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// 初始化
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init();
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function init() {
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// 添加图片按钮
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addImageBtn.addEventListener('click', () => {
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fileInput.click();
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});
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// 文件选择
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fileInput.addEventListener('change', (e) => {
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const file = e.target.files[0];
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if (file) {
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loadImage(file);
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}
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fileInput.value = '';
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});
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// 保存按钮
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saveBtn.addEventListener('click', saveImage);
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// 初始化输入框
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initInput(input1);
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initInput(input2);
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// 点击外部取消选中
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document.addEventListener('click', (e) => {
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if (!e.target.closest('.text-input') && !e.target.closest('.image-container')) {
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deselectAll();
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}
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});
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// 初始化长按保存
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initLongPressSave();
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// 初始化右键菜单
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initContextMenu();
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// 显示长按提示
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setTimeout(() => {
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longPressTip.classList.add('show');
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setTimeout(() => {
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longPressTip.classList.remove('show');
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}, 3000);
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}, 1000);
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}
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// 加载图片
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function loadImage(file) {
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const reader = new FileReader();
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reader.onload = (e) => {
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const img = new Image();
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img.onload = () => {
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currentImage = img;
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bgImage.src = img.src;
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imageContainer.classList.remove('empty');
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emptyTip.classList.add('hidden');
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};
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img.src = e.target.result;
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};
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reader.readAsDataURL(file);
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}
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// 初始化输入框 - 每个输入框独立管理自己的拖拽状态
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function initInput(element) {
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// 每个输入框独立的状态变量
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let isMouseDown = false;
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let isDragging = false;
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let dragTimer = null;
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let startX, startY, startLeft, startTop;
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let clickStartTime = 0;
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let clickStartX = 0;
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let clickStartY = 0;
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let hasMoved = false;
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// 鼠标/触摸按下
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element.addEventListener('mousedown', handleStart);
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element.addEventListener('touchstart', handleStart, { passive: false });
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function handleStart(e) {
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const isTouch = e.type === 'touchstart';
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const clientX = isTouch ? e.touches[0].clientX : e.clientX;
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const clientY = isTouch ? e.touches[0].clientY : e.clientY;
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// 标记鼠标/手指按下
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isMouseDown = true;
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clickStartTime = Date.now();
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clickStartX = clientX;
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clickStartY = clientY;
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hasMoved = false;
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isDragging = false;
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// 如果正在编辑此输入框，不处理
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if (editingInput === element) {
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return;
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}
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// 选中此输入框
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selectInput(element);
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startX = clientX;
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startY = clientY;
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startLeft = element.offsetLeft;
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startTop = element.offsetTop;
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// 延迟判断是否为拖拽（150ms后判定为拖拽）
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dragTimer = setTimeout(() => {
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if (isMouseDown) {
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isDragging = true;
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element.classList.add('dragging');
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}
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}, 150);
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if (isTouch) {
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e.preventDefault();
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}
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}
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// 鼠标/触摸移动 - 绑定到元素上
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element.addEventListener('mousemove', handleMove);
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element.addEventListener('touchmove', handleMove, { passive: false });
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function handleMove(e) {
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// 必须按住鼠标/手指才能拖动
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if (!isMouseDown) return;
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if (!selectedInput || editingInput === element) return;
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const isTouch = e.type === 'touchmove';
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const clientX = isTouch ? e.touches[0].clientX : e.clientX;
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const clientY = isTouch ? e.touches[0].clientY : e.clientY;
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// 判断是否移动
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const moveDistance = Math.sqrt(
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Math.pow(clientX - clickStartX, 2) +
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Math.pow(clientY - clickStartY, 2)
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);
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if (moveDistance > 5) {
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hasMoved = true;
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if (dragTimer) {
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clearTimeout(dragTimer);
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dragTimer = null;
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}
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if (!isDragging) {
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isDragging = true;
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element.classList.add('dragging');
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}
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}
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if (isDragging) {
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const dx = clientX - startX;
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const dy = clientY - startY;
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element.style.left = (startLeft + dx) + 'px';
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element.style.top = (startTop + dy) + 'px';
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if (isTouch) {
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e.preventDefault();
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}
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}
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}
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// 鼠标/触摸释放 - 绑定到元素上
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element.addEventListener('mouseup', handleEnd);
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element.addEventListener('touchend', handleEnd);
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// 鼠标离开元素时也结束拖拽
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element.addEventListener('mouseleave', (e) => {
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if (isMouseDown) {
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handleEnd(e);
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}
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});
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function handleEnd(e) {
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// 标记鼠标/手指释放
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isMouseDown = false;
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// 清除拖拽定时器
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if (dragTimer) {
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clearTimeout(dragTimer);
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dragTimer = null;
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}
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const clickDuration = Date.now() - clickStartTime;
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// 如果是快速点击且未移动，判定为单击（仅选中，不编辑）
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if (!hasMoved && clickDuration < 200 && !isDragging) {
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// 单击仅选中，不进入编辑模式
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if (e && e.preventDefault) {
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e.preventDefault();
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}
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}
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// 立即结束拖拽状态
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if (isDragging) {
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isDragging = false;
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element.classList.remove('dragging');
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}
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}
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// 双击进入编辑模式
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element.addEventListener('dblclick', (e) => {
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e.stopPropagation();
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startEdit(element);
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});
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// 触摸双击检测
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let lastTapTime = 0;
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element.addEventListener('touchend', (e) => {
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const currentTime = Date.now();
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if (currentTime - lastTapTime < 300) {
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// 双击检测
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e.preventDefault();
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e.stopPropagation();
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startEdit(element);
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}
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lastTapTime = currentTime;
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});
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}
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// 选中输入框
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function selectInput(element) {
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// 如果有其他输入框在编辑，先退出编辑
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if (editingInput && editingInput !== element) {
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endEdit(editingInput);
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}
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// 取消之前的选中
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if (selectedInput && selectedInput !== element) {
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selectedInput.classList.remove('selected');
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}
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// 选中当前输入框
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selectedInput = element;
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element.classList.add('selected');
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element.classList.remove('editing');
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element.contentEditable = 'false';
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}
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// 开始编辑
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function startEdit(element) {
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if (editingInput && editingInput !== element) {
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endEdit(editingInput);
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}
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editingInput = element;
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selectedInput = element;
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element.classList.add('editing');
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element.classList.remove('selected');
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element.contentEditable = 'true';
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element.focus();
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// 光标定位到末尾
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const range = document.createRange();
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const sel = window.getSelection();
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range.selectNodeContents(element);
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range.collapse(false);
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sel.removeAllRanges();
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sel.addRange(range);
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// 移动端显示键盘
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if ('virtualKeyboard' in navigator) {
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navigator.virtualKeyboard.show();
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}
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}
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// 结束编辑
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function endEdit(element) {
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element.classList.remove('editing');
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element.contentEditable = 'false';
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element.blur();
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editingInput = null;
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}
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// 取消所有选中
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function deselectAll() {
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if (editingInput) {
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endEdit(editingInput);
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}
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if (selectedInput) {
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selectedInput.classList.remove('selected');
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selectedInput = null;
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}
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}
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// 初始化长按保存
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function initLongPressSave() {
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canvasArea.addEventListener('touchstart', (e) => {
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// 如果触摸的是输入框，不触发长按保存
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if (e.target.closest('.text-input')) {
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return;
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}
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longPressTimer = setTimeout(() => {
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// 震动反馈
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if (navigator.vibrate) {
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navigator.vibrate(50);
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}
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// 保存图片
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saveImage();
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}, 800);
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}, { passive: true });
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canvasArea.addEventListener('touchend', () => {
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if (longPressTimer) {
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clearTimeout(longPressTimer);
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longPressTimer = null;
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}
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});
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canvasArea.addEventListener('touchmove', () => {
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if (longPressTimer) {
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clearTimeout(longPressTimer);
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longPressTimer = null;
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}
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});
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}
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// 初始化右键菜单
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function initContextMenu() {
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// 禁用默认右键菜单
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canvasArea.addEventListener('contextmenu', (e) => {
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// 如果右键点击的是输入框，显示默认菜单
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if (e.target.closest('.text-input')) {
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return;
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}
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e.preventDefault();
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showContextMenu(e.clientX, e.clientY);
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});
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// 点击其他地方关闭菜单
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document.addEventListener('click', () => {
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hideContextMenu();
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});
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}
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// 显示右键菜单
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function showContextMenu(x, y) {
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hideContextMenu();
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const menu = document.createElement('div');
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menu.className = 'context-menu';
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menu.id = 'contextMenu';
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menu.style.left = x + 'px';
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menu.style.top = y + 'px';
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// 复制到剪贴板选项
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const copyItem = document.createElement('div');
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copyItem.className = 'context-menu-item';
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copyItem.textContent = '复制图片';
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copyItem.addEventListener('click', async () => {
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await copyImageToClipboard();
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hideContextMenu();
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});
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// 保存图片选项
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const saveItem = document.createElement('div');
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saveItem.className = 'context-menu-item';
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saveItem.textContent = '保存图片';
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saveItem.addEventListener('click', () => {
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saveImage();
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hideContextMenu();
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});
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menu.appendChild(copyItem);
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menu.appendChild(saveItem);
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document.body.appendChild(menu);
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}
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// 隐藏右键菜单
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function hideContextMenu() {
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const existingMenu = document.getElementById('contextMenu');
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if (existingMenu) {
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existingMenu.remove();
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}
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}
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// 复制图片到剪贴板
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async function copyImageToClipboard() {
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if (!currentImage) {
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alert('请先添加背景图片');
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return;
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}
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try {
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// 取消所有选中和编辑状态
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deselectAll();
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const canvas = await generateCanvas();
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const blob = await new Promise(resolve => canvas.toBlob(resolve, 'image/png'));
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await navigator.clipboard.write([
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new ClipboardItem({ 'image/png': blob })
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]);
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alert('图片已复制到剪贴板');
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} catch (err) {
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console.error('复制失败:', err);
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alert('复制失败，请尝试保存图片');
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}
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}
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// 生成画布（预览与保存样式一致）
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async function generateCanvas() {
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const canvas = exportCanvas;
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const ctx = canvas.getContext('2d');
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// 获取容器实际尺寸
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const containerWidth = imageContainer.clientWidth;
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const containerHeight = imageContainer.clientHeight;
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// 设置画布尺寸与容器一致
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canvas.width = containerWidth;
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canvas.height = containerHeight;
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// 绘制白色背景
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ctx.fillStyle = '#fff';
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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// 如果有背景图，绘制背景图（保持cover效果）
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if (currentImage) {
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drawImageCover(ctx, currentImage, 0, 0, containerWidth, containerHeight);
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}
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// 绘制文字（保持与预览完全一致的位置和样式）
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drawTextOnCanvas(ctx, input1, containerWidth, containerHeight);
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drawTextOnCanvas(ctx, input2, containerWidth, containerHeight);
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return canvas;
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}
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// 绘制图片保持cover效果（与CSS object-fit: cover一致）
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function drawImageCover(ctx, img, x, y, width, height) {
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const imgRatio = img.naturalWidth / img.naturalHeight;
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const containerRatio = width / height;
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let drawWidth, drawHeight, drawX, drawY;
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if (imgRatio > containerRatio) {
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// 图片更宽，以高度为基准
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drawHeight = height;
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drawWidth = height * imgRatio;
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drawX = x + (width - drawWidth) / 2;
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drawY = y;
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} else {
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// 图片更高，以宽度为基准
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drawWidth = width;
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drawHeight = width / imgRatio;
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drawX = x;
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drawY = y + (height - drawHeight) / 2;
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}
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ctx.drawImage(img, drawX, drawY, drawWidth, drawHeight);
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}
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// 在画布上绘制文字（保持与预览完全一致）
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function drawTextOnCanvas(ctx, inputElement, containerWidth, containerHeight) {
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const text = inputElement.textContent;
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if (!text) return;
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const style = window.getComputedStyle(inputElement);
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// 获取输入框位置（相对于容器）
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const inputLeft = inputElement.offsetLeft;
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const inputTop = inputElement.offsetTop;
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// 设置字体样式（与预览完全一致）
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const fontSize = parseInt(style.fontSize);
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ctx.font = `${style.fontWeight} ${fontSize}px ${style.fontFamily}`;
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ctx.fillStyle = style.color;
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ctx.textBaseline = 'top';
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// 绘制文字（保持与预览完全一致的位置）
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ctx.fillText(text, inputLeft, inputTop);
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}
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// 保存图片
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async function saveImage() {
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if (!currentImage) {
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alert('请先添加背景图片');
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return;
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}
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try {
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const canvas = await generateCanvas();
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// 下载图片
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const link = document.createElement('a');
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link.download = '邀请函_' + Date.now() + '.png';
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link.href = canvas.toDataURL('image/png');
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link.click();
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} catch (err) {
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console.error('保存失败:', err);
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alert('保存失败，请重试');
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}
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}
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})();
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