From fe10a00ba9a3c30d8718ca004ccd19518466f5bd Mon Sep 17 00:00:00 2001
From: Pitu <7425261+Pitu@users.noreply.github.com>
Date: Sun, 16 Sep 2018 01:09:02 -0300
Subject: Site

---
 src/site/components/grid/waterfall/Waterfall.vue | 181 +++++++++++++++++++++++
 1 file changed, 181 insertions(+)
 create mode 100644 src/site/components/grid/waterfall/Waterfall.vue

(limited to 'src/site/components/grid/waterfall/Waterfall.vue')

diff --git a/src/site/components/grid/waterfall/Waterfall.vue b/src/site/components/grid/waterfall/Waterfall.vue
new file mode 100644
index 0000000..9827075
--- /dev/null
+++ b/src/site/components/grid/waterfall/Waterfall.vue
@@ -0,0 +1,181 @@
+<style>
+	.waterfall {
+		position: relative;
+	}
+</style>
+<template>
+	<div class="waterfall">
+		<slot/>
+	</div>
+</template>
+<script>
+// import {quickSort, getMinIndex, _, sum} from './util'
+
+const quickSort = (arr, type) => {
+	let left = [];
+	let right = [];
+	let povis;
+	if (arr.length <= 1) {
+		return arr;
+	}
+	povis = arr[0];
+	for (let i = 1; i < arr.length; i++) {
+		if (arr[i][type] < povis[type]) {
+			left.push(arr[i]);
+		} else {
+			right.push(arr[i]);
+		}
+	}
+	return quickSort(left, type).concat(povis, quickSort(right, type))
+};
+
+const getMinIndex = arr => {
+	let pos = 0;
+	for (let i = 0; i < arr.length; i++) {
+		if (arr[pos] > arr[i]) {
+			pos = i;
+		}
+	}
+	return pos;
+};
+
+const _ = {
+	on(el, type, func, capture = false) {
+		el.addEventListener(type, func, capture);
+	},
+	off(el, type, func, capture = false) {
+		el.removeEventListener(type, func, capture);
+	}
+};
+
+const sum = arr => arr.reduce((sum, val) => sum + val);
+export default {
+	name: 'Waterfall',
+	props: {
+		gutterWidth: {
+			type: Number,
+			default: 0
+		},
+		gutterHeight: {
+			type: Number,
+			default: 0
+		},
+		resizable: {
+			type: Boolean,
+			default: true
+		},
+		align: {
+			type: String,
+			default: 'center'
+		},
+		fixWidth: {
+			type: Number
+		},
+		minCol: {
+			type: Number,
+			default: 1
+		},
+		maxCol: {
+			type: Number
+		},
+		percent: {
+			type: Array
+		}
+	},
+	data() {
+		return {
+			timer: null,
+			colNum: 0,
+			lastWidth: 0,
+			percentWidthArr: []
+		};
+	},
+	created() {
+		this.$on('itemRender', () => {
+			if (this.timer) {
+				clearTimeout(this.timer);
+			}
+			this.timer = setTimeout(() => {
+				this.render();
+			}, 0);
+		});
+	},
+	mounted() {
+		this.resizeHandle();
+		this.$watch('resizable', this.resizeHandle);
+	},
+	methods: {
+		calulate(arr) {
+			let pageWidth = this.fixWidth ? this.fixWidth : this.$el.offsetWidth;
+			// 百分比布局计算
+			if (this.percent) {
+				this.colNum = this.percent.length;
+				const total = sum(this.percent);
+				this.percentWidthArr = this.percent.map(value => (value / total) * pageWidth);
+				this.lastWidth = 0;
+			// 正常布局计算
+			} else {
+				this.colNum = parseInt(pageWidth / (arr.width + this.gutterWidth));
+				if (this.minCol && this.colNum < this.minCol) {
+					this.colNum = this.minCol;
+					this.lastWidth = 0;
+				} else if (this.maxCol && this.colNum > this.maxCol) {
+					this.colNum = this.maxCol;
+					this.lastWidth = pageWidth - (arr.width + this.gutterWidth) * this.colNum + this.gutterWidth;
+				} else {
+					this.lastWidth = pageWidth - (arr.width + this.gutterWidth) * this.colNum + this.gutterWidth;
+				}
+			}
+		},
+		resizeHandle() {
+			if (this.resizable) {
+				_.on(window, 'resize', this.render, false);
+			} else {
+				_.off(window, 'resize', this.render, false);
+			}
+		},
+		render() {
+			// 重新排序
+			let childArr = [];
+			childArr = this.$children.map(child => child.getMeta());
+			childArr = quickSort(childArr, 'order');
+			// 计算列数
+			this.calulate(childArr[0])
+			let offsetArr = Array(this.colNum).fill(0);
+			// 渲染
+			childArr.forEach(child => {
+				let position = getMinIndex(offsetArr);
+				// 百分比布局渲染
+				if (this.percent) {
+					let left = 0;
+					child.el.style.width = `${this.percentWidthArr[position]}px`;
+					if (position === 0) {
+						left = 0;
+					} else {
+						for (let i = 0; i < position; i++) {
+							left += this.percentWidthArr[i];
+						}
+					}
+					child.el.style.left = `${left}px`;
+				// 正常布局渲染
+				} else {
+					if (this.align === 'left') { // eslint-disable-line no-lonely-if
+						child.el.style.left = `${position * (child.width + this.gutterWidth)}px`;
+					} else if (this.align === 'right') {
+						child.el.style.left = `${position * (child.width + this.gutterWidth) + this.lastWidth}px`;
+					} else {
+						child.el.style.left = `${position * (child.width + this.gutterWidth) + this.lastWidth / 2}px`;
+					}
+				}
+				if (child.height === 0) {
+					return;
+				}
+				child.el.style.top = `${offsetArr[position]}px`;
+				offsetArr[position] += (child.height + this.gutterHeight);
+				this.$el.style.height = `${Math.max.apply(Math, offsetArr)}px`;
+			});
+			this.$emit('rendered', this);
+		}
+	}
+};
+</script>
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