<template>
<div class="drag-verify-container">
<div :style="dragVerifyImgStyle">
<img
ref="checkImg"
crossOrigin="anonymous"
:src="imgsrc"
@load="checkimgLoaded"
style="width:100%"
alt=""
>
<canvas
ref="maincanvas"
class="main-canvas"
></canvas>
<canvas
ref="movecanvas"
:class="{goFirst:isOk, goKeep:isKeep}"
class="move-canvas"
></canvas>
<div
class="refresh"
v-if="showRefresh && !isPassing"
>
<i
:class="refreshIcon"
@click="refreshimg"
></i>
</div>
<div
class="tips success"
v-if="showTips && isPassing"
>{{successTip}}</div>
<div
class="tips danger"
v-if="showTips && !isPassing && showErrorTip"
>{{failTip}}</div>
</div>
<div
ref="dragVerify"
class="drag_verify"
:style="dragVerifyStyle"
@mousemove="dragMoving"
@mouseup="dragFinish"
@mouseleave="dragFinish"
@touchmove="dragMoving"
@touchend="dragFinish"
>
<div
class="dv_progress_bar"
:class="{goFirst2:isOk}"
ref="progressBar"
:style="progressBarStyle"
>
{{successMessage}}
</div>
<div
class="dv_text"
:style="textStyle"
ref="message"
>
{{message}}
</div>
<div
class="dv_handler dv_handler_bg"
:class="{goFirst:isOk}"
@mousedown="dragStart"
@touchstart="dragStart"
ref="handler"
:style="handlerStyle"
>
<i :class="handlerIcon"></i>
</div>
</div>
</div>
</template>
<script>
export default {
name: "dragVerifyImgChip",
props: {
isPassing: {
type: Boolean,
default: false
},
width: {
type: Number,
default: 320
},
height: {
type: Number,
default: 40
},
text: {
type: String,
default: "swiping to the right side"
},
successText: {
type: String,
default: "success"
},
background: {
type: String,
default: "#eee"
},
progressBarBg: {
type: String,
default: "#76c61d"
},
completedBg: {
type: String,
default: "#76c61d"
},
circle: {
type: Boolean,
default: false
},
radius: {
type: String,
default: "4px"
},
handlerIcon: {
type: String
},
successIcon: {
type: String
},
handlerBg: {
type: String,
default: "#fff"
},
textSize: {
type: String,
default: "14px"
},
textColor: {
type: String,
default: "#333"
},
imgsrc: {
type: String
},
barWidth: {
type: Number,
default: 40
},
barRadius: {
type: Number,
default: 8
},
showRefresh: {
type: Boolean,
default: false
},
refreshIcon: {
type: String
},
showTips: {
type: Boolean,
default: true
},
successTip: {
type: String,
default: "验证通过,超过80%用户"
},
failTip: {
type: String,
default: "验证未通过,拖动滑块将悬浮图像正确合并"
},
diffWidth: {
type: Number,
default: 20
}
},
mounted: function() {
const dragEl = this.$refs.dragVerify;
dragEl.style.setProperty("--textColor", this.textColor);
dragEl.style.setProperty("--width", Math.floor(this.width / 2) + "px");
dragEl.style.setProperty("--pwidth", -Math.floor(this.width / 2) + "px");
},
computed: {
handlerStyle: function() {
return {
width: this.height + "px",
height: this.height + "px",
background: this.handlerBg
};
},
message: function() {
return this.isPassing ? "" : this.text;
},
successMessage: function() {
return this.isPassing ? this.successText : "";
},
dragVerifyStyle: function() {
return {
width: this.width + "px",
height: this.height + "px",
lineHeight: this.height + "px",
background: this.background,
borderRadius: this.circle ? this.height / 2 + "px" : this.radius
};
},
dragVerifyImgStyle: function() {
return {
width: this.width + "px",
position: "relative",
overflow: "hidden"
};
},
progressBarStyle: function() {
return {
background: this.progressBarBg,
height: this.height + "px",
borderRadius: this.circle
? this.height / 2 + "px 0 0 " + this.height / 2 + "px"
: this.radius
};
},
textStyle: function() {
return {
height: this.height + "px",
width: this.width + "px",
fontSize: this.textSize
};
}
},
data() {
return {
isMoving: false,
x: 0,
isOk: false,
isKeep: false,
clipBarx: 0,
showErrorTip: false
};
},
methods: {
draw: function(ctx, x, y, operation) {
var l = this.barWidth;
var r = this.barRadius;
const PI = Math.PI;
ctx.beginPath();
ctx.moveTo(x, y);
ctx.arc(x + l / 2, y - r + 2, r, 0.72 * PI, 2.26 * PI);
ctx.lineTo(x + l, y);
ctx.arc(x + l + r - 2, y + l / 2, r, 1.21 * PI, 2.78 * PI);
ctx.lineTo(x + l, y + l);
ctx.lineTo(x, y + l);
ctx.arc(x + r - 2, y + l / 2, r + 0.4, 2.76 * PI, 1.24 * PI, true);
ctx.lineTo(x, y);
ctx.lineWidth = 2;
ctx.fillStyle = "rgba(255, 255, 255, 0.8)";
ctx.strokeStyle = "rgba(255, 255, 255, 0.8)";
ctx.stroke();
ctx[operation]();
ctx.globalCompositeOperation = "destination-over";
},
checkimgLoaded: function() {
const img = this.$refs.checkImg;
if (!img.complete || img.naturalWidth === 0) {
img.onload = () => this.drawMissingPart(); // 图片加载完成后重试
return;
}
this.drawMissingPart();
},
drawMissingPart: function() {
// 生成图片缺失位置
var barWidth = this.barWidth;
var imgHeight = this.$refs.checkImg.height;
var imgWidth = this.$refs.checkImg.width;
var halfWidth = Math.floor(this.width / 2);
var refreshHeigth = 25;
var tipHeight = 20;
var x = halfWidth + Math.ceil(Math.random() * (halfWidth - barWidth - this.barRadius - 5));
var y =
refreshHeigth +
Math.floor(
Math.random() * (imgHeight - barWidth - refreshHeigth - tipHeight)
);
this.$refs.maincanvas.setAttribute("width", imgWidth);
this.$refs.maincanvas.setAttribute("height", imgHeight);
this.$refs.maincanvas.style.display = "block";
var canvasCtx = this.$refs.maincanvas.getContext("2d");
this.draw(canvasCtx, x, y, "fill");
this.clipBarx = x;
var moveCanvas = this.$refs.movecanvas;
moveCanvas.setAttribute("width", imgWidth);
moveCanvas.setAttribute("height", imgHeight);
this.$refs.movecanvas.style.display = "block";
const L = barWidth + this.barRadius * 2 + 3; //实际宽度
var moveCtx = this.$refs.movecanvas.getContext("2d");
moveCtx.clearRect(0, 0, imgWidth, imgHeight);
this.draw(moveCtx, x, y, "clip");
moveCtx.drawImage(this.$refs.checkImg, 0, 0, imgWidth, imgHeight);
var y = y - this.barRadius * 2 - 1;
const ImageData = moveCtx.getImageData(x, y, L, L);
moveCanvas.setAttribute("width", L);
moveCanvas.setAttribute("height", imgHeight);
moveCtx.putImageData(ImageData, 0, y);
},
dragStart: function(e) {
if (!this.isPassing) {
this.isMoving = true;
this.x =
(e.pageX || e.touches[0].pageX)
}
this.showBar = true;
this.showErrorTip = false;
this.$emit("handlerMove");
},
dragMoving: function(e) {
if (this.isMoving && !this.isPassing) {
var _x = (e.pageX || e.touches[0].pageX) - this.x;
var handler = this.$refs.handler;
handler.style.left = _x + "px";
this.$refs.progressBar.style.width = _x + this.height / 2 + "px";
this.$refs.movecanvas.style.left = _x + "px";
}
},
dragFinish: function(e) {
if (this.isMoving && !this.isPassing) {
var _x = (e.pageX || e.changedTouches[0].pageX) - this.x;
if (Math.abs(_x - this.clipBarx) > this.diffWidth) {
this.isOk = true;
var that = this;
setTimeout(function() {
that.$refs.handler.style.left = "0";
that.$refs.progressBar.style.width = "0";
that.$refs.movecanvas.style.left = "0";
that.isOk = false;
}, 500);
this.$emit("passfail");
this.showErrorTip = true;
} else {
this.passVerify();
}
this.isMoving = false;
}
},
passVerify: function() {
this.$emit("update:isPassing", true);
this.isMoving = false;
var handler = this.$refs.handler;
handler.children[0].className = this.successIcon;
this.$refs.progressBar.style.background = this.completedBg;
this.$refs.message.style["-webkit-text-fill-color"] = "unset";
this.$refs.message.style.animation = "slidetounlock2 3s infinite";
this.$refs.progressBar.style.color = "#fff";
this.$refs.progressBar.style.fontSize = this.textSize;
this.isKeep = true;
setTimeout(() => {
this.$refs.movecanvas.style.left = this.clipBarx + "px";
setTimeout(() => {
this.isKeep = false;
this.$refs.maincanvas.style.display = "none";
this.$refs.movecanvas.style.display = "none";
}, 200);
}, 100);
this.$emit("passcallback");
},
reset: function() {
this.reImg();
this.checkimgLoaded();
},
reImg: function() {
this.$emit("update:isPassing", false);
const oriData = this.$options.data();
for (const key in oriData) {
if (Object.prototype.hasOwnProperty.call(oriData, key)) {
this[key] = oriData[key]
}
}
var handler = this.$refs.handler;
var message = this.$refs.message;
handler.style.left = "0";
this.$refs.progressBar.style.width = "0";
handler.children[0].className = this.handlerIcon;
message.style["-webkit-text-fill-color"] = "transparent";
message.style.animation = "slidetounlock 3s infinite";
message.style.color = this.background;
this.$refs.movecanvas.style.left = "0px";
this.$refs.maincanvas.style.display = "block";
this.$refs.movecanvas.style.display = "block";
},
refreshimg: function() {
this.$emit("refresh");
}
},
watch: {
imgsrc: {
immediate: false,
handler: function() {
this.reImg();
}
}
}
};
</script>
<style scoped>
.drag_verify {
position: relative;
background-color: #e8e8e8;
text-align: center;
overflow: hidden;
}
.drag_verify .dv_handler {
position: absolute;
top: 0px;
left: 0px;
cursor: move;
}
.drag_verify .dv_handler i {
color: #666;
padding-left: 0;
font-size: 16px;
}
.drag_verify .dv_handler .el-icon-circle-check {
color: #6c6;
margin-top: 9px;
}
.drag_verify .dv_progress_bar {
position: absolute;
height: 34px;
width: 0px;
}
.drag_verify .dv_text {
position: absolute;
top: 0px;
color: transparent;
-moz-user-select: none;
-webkit-user-select: none;
user-select: none;
-o-user-select: none;
-ms-user-select: none;
background: -webkit-gradient(
linear,
left top,
right top,
color-stop(0, var(--textColor)),
color-stop(0.4, var(--textColor)),
color-stop(0.5, #fff),
color-stop(0.6, var(--textColor)),
color-stop(1, var(--textColor))
);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
-webkit-text-size-adjust: none;
animation: slidetounlock 3s infinite;
}
.drag_verify .dv_text * {
-webkit-text-fill-color: var(--textColor);
}
.goFirst {
left: 0px !important;
transition: left 0.5s;
}
.goKeep {
transition: left 0.2s;
}
.goFirst2 {
width: 0px !important;
transition: width 0.5s;
}
.drag-verify-container {
position: relative;
line-height: 0;
}
.refresh {
position: absolute;
right: 5px;
top: 5px;
cursor: pointer;
font-size: 20px;
z-index: 200;
}
.tips {
position: absolute;
bottom: 0;
height: 20px;
line-height: 20px;
text-align: center;
width: 100%;
font-size: 12px;
z-index: 200;
}
.tips.success {
background: rgba(255, 255, 255, 0.6);
color: green;
}
.tips.danger {
background: rgba(0, 0, 0, 0.6);
color: yellow;
}
.main-canvas {
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
}
.move-canvas {
position: absolute;
top: 0;
left: 0;
z-index: 100;
}
</style>
<style>
@-webkit-keyframes slidetounlock {
0% {
background-position: var(--pwidth) 0;
}
100% {
background-position: var(--width) 0;
}
}
@-webkit-keyframes slidetounlock2 {
0% {
background-position: var(--pwidth) 0;
}
100% {
background-position: var(--pwidth) 0;
}
}
</style>
缺失图片经常不显示