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<script>
export default {
props: {
startSize: {
type: Number,
required: true,
},
side: {
type: String,
required: true,
},
minSize: {
type: Number,
required: false,
default: 0,
},
maxSize: {
type: Number,
required: false,
default: Number.MAX_VALUE,
},
enabled: {
type: Boolean,
required: false,
default: true,
},
},
data() {
return {
size: this.startSize,
};
},
computed: {
className() {
return `drag-${this.side}`;
},
cursorStyle() {
if (this.enabled) {
return { cursor: 'ew-resize' };
}
return {};
},
},
methods: {
resetSize(e) {
e.preventDefault();
this.$emit('resize-start', this.size);
this.size = this.startSize;
this.$emit('update:size', this.size);
// End resizing on next tick so that listeners can react to DOM changes
this.$nextTick(() => {
this.$emit('resize-end', this.size);
});
},
startDrag(e) {
if (this.enabled) {
e.preventDefault();
this.startPos = e.clientX;
this.currentStartSize = this.size;
document.addEventListener('mousemove', this.drag);
document.addEventListener('mouseup', this.endDrag, { once: true });
this.$emit('resize-start', this.size);
}
},
drag(e) {
e.preventDefault();
let moved = e.clientX - this.startPos;
if (this.side === 'left') moved = -moved;
let newSize = this.currentStartSize + moved;
if (newSize < this.minSize) {
newSize = this.minSize;
} else if (newSize > this.maxSize) {
newSize = this.maxSize;
}
this.size = newSize;
this.$emit('update:size', newSize);
},
endDrag(e) {
e.preventDefault();
document.removeEventListener('mousemove', this.drag);
this.$emit('resize-end', this.size);
},
},
};
</script>
<template>
<div
:class="className"
:style="cursorStyle"
class="drag-handle"
@mousedown="startDrag"
@dblclick="resetSize"
></div>
</template>
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