alpha.vue
2.77 KB
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<template>
<div class="ivu-color-picker-alpha">
<div class="ivu-color-picker-alpha-checkboard-wrap">
<div class="ivu-color-picker-alpha-checkerboard"></div>
</div>
<div class="ivu-color-picker-alpha-gradient" :style="{background: gradientColor}"></div>
<div class="ivu-color-picker-alpha-container" ref="container"
@mousedown="handleMouseDown"
@touchmove="handleChange"
@touchstart="handleChange">
<div class="ivu-color-picker-alpha-pointer" :style="{left: colors.a * 100 + '%'}">
<div class="ivu-color-picker-alpha-picker"></div>
</div>
</div>
</div>
</template>
<script>
export default {
name: 'Alpha',
props: {
value: Object,
onChange: Function
},
computed: {
colors () {
return this.value;
},
gradientColor () {
const rgba = this.colors.rgba;
const rgbStr = [rgba.r, rgba.g, rgba.b].join(',');
return 'linear-gradient(to right, rgba(' + rgbStr + ', 0) 0%, rgba(' + rgbStr + ', 1) 100%)';
}
},
methods: {
handleChange (e, skip) {
!skip && e.preventDefault();
const container = this.$refs.container;
const containerWidth = container.clientWidth;
const xOffset = container.getBoundingClientRect().left + window.pageXOffset;
const pageX = e.pageX || (e.touches ? e.touches[0].pageX : 0);
const left = pageX - xOffset;
let a;
if (left < 0) {
a = 0;
} else if (left > containerWidth) {
a = 1;
} else {
a = Math.round(left * 100 / containerWidth) / 100;
}
if (this.colors.a !== a) {
this.$emit('change', {
h: this.colors.hsl.h,
s: this.colors.hsl.s,
l: this.colors.hsl.l,
a: a,
source: 'rgba'
});
}
},
handleMouseDown (e) {
this.handleChange(e, true);
window.addEventListener('mousemove', this.handleChange);
window.addEventListener('mouseup', this.handleMouseUp);
},
handleMouseUp () {
this.unbindEventListeners();
},
unbindEventListeners () {
window.removeEventListener('mousemove', this.handleChange);
window.removeEventListener('mouseup', this.handleMouseUp);
}
}
};
</script>