Modify the directory structure

Modify the directory structure

src/components/affix/affix.vue

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+<template>
+    <div>
+        <div :class="classes" :style="styles">
+            <slot></slot>
+        </div>
+    </div>
+</template>
+
+<script>
+    const prefixCls = 'ivu-affix';
+
+    function getScroll(target, top) {
+        const prop = top ? 'pageYOffset' : 'pageXOffset';
+        const method = top ? 'scrollTop' : 'scrollLeft';
+
+        let ret = target[prop];
+
+        if (typeof ret !== 'number') {
+            ret = window.document.documentElement[method];
+        }
+
+        return ret;
+    }
+
+    function getOffset(element) {
+        const rect = element.getBoundingClientRect();
+
+        const scrollTop = getScroll(window, true);
+        const scrollLeft = getScroll(window);
+
+        const docEl = window.document.body;
+        const clientTop = docEl.clientTop || 0;
+        const clientLeft = docEl.clientLeft || 0;
+
+        return {
+            top: rect.top + scrollTop - clientTop,
+            left: rect.left + scrollLeft - clientLeft
+        }
+    }
+
+    export default {
+        props: {
+            offsetTop: {
+                type: Number,
+                default: 0
+            },
+            offsetBottom: {
+                type: Number
+            }
+        },
+        data () {
+            return {
+                affix: false,
+                styles: {}
+            }
+        },
+        computed: {
+            offsetType () {
+                let type = 'top';
+                if (this.offsetBottom >= 0) {
+                    type = 'bottom';
+                }
+
+                return type;
+            },
+            classes () {
+                return [
+                    {
+                        [`${prefixCls}`]: this.affix
+                    }
+                ]
+            }
+        },
+        ready () {
+            window.addEventListener('scroll', this.handleScroll, false);
+            window.addEventListener('resize', this.handleScroll, false);
+        },
+        beforeDestroy () {
+            window.removeEventListener('scroll', this.handleScroll, false);
+            window.removeEventListener('resize', this.handleScroll, false);
+        },
+        methods: {
+            handleScroll () {
+                const affix = this.affix;
+                const scrollTop = getScroll(window, true);
+                const elOffset = getOffset(this.$el);
+                const windowHeight = window.innerHeight;
+                const elHeight = this.$el.getElementsByTagName('div')[0].offsetHeight;
+
+                // Fixed Top
+                if ((elOffset.top - this.offsetTop) < scrollTop && this.offsetType == 'top' && !affix) {
+                    this.affix = true;
+                    this.styles = {
+                        top: `${this.offsetTop}px`,
+                        left: `${elOffset.left}px`,
+                        width: `${this.$el.offsetWidth}px`
+                    };
+
+                    this.$emit('on-change', true);
+                } else if ((elOffset.top - this.offsetTop) > scrollTop && this.offsetType == 'top' && affix) {
+                    this.affix = false;
+                    this.styles = null;
+
+                    this.$emit('on-change', false);
+                }
+
+                // Fixed Bottom
+                if ((elOffset.top + this.offsetBottom + elHeight) > (scrollTop + windowHeight) && this.offsetType == 'bottom' && !affix) {
+                    this.affix = true;
+                    this.styles = {
+                        bottom: `${this.offsetBottom}px`,
+                        left: `${elOffset.left}px`,
+                        width: `${this.$el.offsetWidth}px`
+                    };
+
+                    this.$emit('on-change', true);
+                } else if ((elOffset.top + this.offsetBottom + elHeight) < (scrollTop + windowHeight) && this.offsetType == 'bottom' && affix) {
+                    this.affix = false;
+                    this.styles = null;
+                    
+                    this.$emit('on-change', false);
+                }
+            }
+        }
+    }
+</script>

src/components/affix/index.js

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+import Affix from './affix.vue';
+export default Affix;