| | |
| | | </div> |
| | | <Modal ref="modalRef" @success="getTableData"></Modal> |
| | | <el-dialog v-model="qrDialogVisible" title="二维码" width="300px" draggable> |
| | | <div style="text-align:center;"> |
| | | <img :src="qrCodeUrl" alt="二维码" style="width:200px;height:200px;" /> |
| | | <div class="qr-dialog-content"> |
| | | <img :src="qrCodeUrl" alt="二维码" style="width:220px;height:auto;" /> |
| | | <div style="margin:10px 0;"> |
| | | <el-button type="primary" @click="downloadQRCode">下载二维码图片</el-button> |
| | | </div> |
| | |
| | | }); |
| | | }; |
| | | |
| | | const loadImage = (src) => |
| | | new Promise((resolve, reject) => { |
| | | const img = new Image(); |
| | | img.onload = () => resolve(img); |
| | | img.onerror = (err) => reject(err); |
| | | img.src = src; |
| | | }); |
| | | |
| | | const wrapTextLines = (ctx, text, maxWidth) => { |
| | | const safeText = String(text || "").trim(); |
| | | if (!safeText) return []; |
| | | const lines = []; |
| | | let currentLine = ""; |
| | | for (const char of safeText) { |
| | | const nextLine = currentLine + char; |
| | | if (ctx.measureText(nextLine).width > maxWidth && currentLine) { |
| | | lines.push(currentLine); |
| | | currentLine = char; |
| | | } else { |
| | | currentLine = nextLine; |
| | | } |
| | | } |
| | | if (currentLine) { |
| | | lines.push(currentLine); |
| | | } |
| | | return lines; |
| | | }; |
| | | |
| | | const buildQrImageWithTitle = async (qrContent, deviceName) => { |
| | | const baseQrDataUrl = await QRCode.toDataURL(qrContent, { |
| | | width: 220, |
| | | margin: 2, |
| | | }); |
| | | const qrImage = await loadImage(baseQrDataUrl); |
| | | |
| | | const canvas = document.createElement("canvas"); |
| | | const ctx = canvas.getContext("2d"); |
| | | if (!ctx) return baseQrDataUrl; |
| | | const titleText = deviceName || "未命名设备"; |
| | | const fontSize = 30; |
| | | const sidePadding = 16; |
| | | const topPadding = 14; |
| | | const titleBottomGap = 10; |
| | | const bottomPadding = 14; |
| | | |
| | | ctx.font = `${fontSize}px sans-serif`; |
| | | const textMaxWidth = qrImage.width + 40; |
| | | const titleLines = wrapTextLines(ctx, titleText, textMaxWidth); |
| | | const lineHeight = 22; |
| | | const titleHeight = titleLines.length * lineHeight; |
| | | |
| | | canvas.width = Math.max(qrImage.width + sidePadding * 2, textMaxWidth + sidePadding * 2); |
| | | canvas.height = topPadding + titleHeight + titleBottomGap + qrImage.height + bottomPadding; |
| | | |
| | | ctx.fillStyle = "#ffffff"; |
| | | ctx.fillRect(0, 0, canvas.width, canvas.height); |
| | | |
| | | ctx.font = `${fontSize}px sans-serif`; |
| | | ctx.fillStyle = "#303133"; |
| | | ctx.textAlign = "center"; |
| | | ctx.textBaseline = "middle"; |
| | | titleLines.forEach((line, index) => { |
| | | const y = topPadding + lineHeight * index + lineHeight / 2; |
| | | ctx.fillText(line, canvas.width / 2, y); |
| | | }); |
| | | |
| | | const qrX = (canvas.width - qrImage.width) / 2; |
| | | const qrY = topPadding + titleHeight + titleBottomGap; |
| | | ctx.drawImage(qrImage, qrX, qrY, qrImage.width, qrImage.height); |
| | | |
| | | return canvas.toDataURL("image/png"); |
| | | }; |
| | | |
| | | const showQRCode = async (row) => { |
| | | // 直接使用URL,不要用JSON.stringify包装 |
| | | const qrContent = proxy.javaApi + '/device-info?deviceId=' + row.id; |
| | | qrCodeUrl.value = await QRCode.toDataURL(qrContent); |
| | | qrCodeUrl.value = await buildQrImageWithTitle(qrContent, row.deviceName); |
| | | qrRowData.value = row; |
| | | qrDialogVisible.value = true; |
| | | }; |
| | |
| | | justify-content: space-between; |
| | | margin-bottom: 10px; |
| | | } |
| | | |
| | | .qr-dialog-content { |
| | | text-align: center; |
| | | } |
| | | |
| | | .qr-device-name { |
| | | margin-bottom: 8px; |
| | | font-size: 14px; |
| | | font-weight: 600; |
| | | line-height: 1.4; |
| | | word-break: break-all; |
| | | } |
| | | </style> |