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<template>
<div class="gradient-bar">
<div class="bar" ref="barRef" :style="{ backgroundImage: gradientStyle }" @click="$event => addPoint($event)"></div>
<div class="point"
:class="{ 'active': index === i }"
v-for="(item, i) in points"
:key="item.pos + '-' + i"
:style="{
backgroundColor: item.color,
left: `calc(${item.pos}% - 5px)`,
}"
@mousedown.left="movePoint(i)"
@click.right="removePoint(i)"
></div>
</div>
</template>
<script lang="ts" setup>
import type { GradientColor } from '@/types/slides'
import { ref, computed, watchEffect } from 'vue'
const props = defineProps<{
value: GradientColor[]
index: number
}>()
const emit = defineEmits<{
(event: 'update:value', payload: GradientColor[]): void
(event: 'update:index', payload: number): void
}>()
const points = ref<GradientColor[]>([])
const barRef = ref<HTMLElement>()
watchEffect(() => {
points.value = props.value
if (props.index > props.value.length - 1) emit('update:index', 0)
})
const gradientStyle = computed(() => {
const list = points.value.map(item => `${item.color} ${item.pos}%`)
return `linear-gradient(to right, ${list.join(',')})`
})
const removePoint = (index: number) => {
if (props.value.length <= 2) return
let targetIndex = 0
if (index === props.index) {
targetIndex = (index - 1 < 0) ? 0 : index - 1
}
else if (props.index === props.value.length - 1) {
targetIndex = props.value.length - 2
}
const values = props.value.filter((item, _index) => _index !== index)
emit('update:index', targetIndex)
emit('update:value', values)
}
const movePoint = (index: number) => {
let isMouseDown = true
document.onmousemove = e => {
if (!isMouseDown) return
if (!barRef.value) return
let pos = Math.round((e.clientX - barRef.value.getBoundingClientRect().left) / barRef.value.clientWidth * 100)
if (pos > 100) pos = 100
if (pos < 0) pos = 0
points.value = points.value.map((item, _index) => {
if (_index === index) return { ...item, pos }
return item
})
}
document.onmouseup = () => {
isMouseDown = false
const point = points.value[index]
const _points = [...points.value]
_points.splice(index, 1)
let targetIndex = 0
for (let i = 0; i < _points.length; i++) {
if (point.pos > _points[i].pos) targetIndex = i + 1
}
_points.splice(targetIndex, 0, point)
emit('update:index', targetIndex)
emit('update:value', _points)
document.onmousemove = null
document.onmouseup = null
}
}
const addPoint = (e: MouseEvent) => {
if (props.value.length >= 6) return
if (!barRef.value) return
const pos = Math.round((e.clientX - barRef.value.getBoundingClientRect().left) / barRef.value.clientWidth * 100)
let targetIndex = 0
for (let i = 0; i < props.value.length; i++) {
if (pos > props.value[i].pos) targetIndex = i + 1
}
const color = props.value[targetIndex - 1] ? props.value[targetIndex - 1].color : props.value[targetIndex].color
const values = [...props.value]
values.splice(targetIndex, 0, { pos, color })
emit('update:index', targetIndex)
emit('update:value', values)
}
</script>
<style lang="scss" scoped>
.gradient-bar {
width: calc(100% - 10px);
height: 18px;
padding: 1px 0;
margin: 3px 0;
position: relative;
left: 5px;
.bar {
height: 16px;
border: 1px solid #d9d9d9;
}
.point {
width: 10px;
height: 18px;
background-color: #fff;
position: absolute;
top: 0;
border: 2px solid #fff;
outline: 1px solid #d9d9d9;
box-shadow: 0 0 2px 2px #d9d9d9;
border-radius: 1px;
cursor: pointer;
&.active {
outline: 1px solid $themeColor;
box-shadow: 0 0 2px 2px $themeColor;
}
}
}
</style> |