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<a href="../../../index.html">all files</a> / <a href="index.html">packages/waterfall/src/</a> directive.js
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<span class="strong">20.37% </span>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">import Utils from './utils.js';
&nbsp;
const CONTEXT = '@@Waterfall';
const OFFSET = 300;
&nbsp;
// 绑定事件到元素上
// 读取基本的控制变量
<span class="fstat-no" title="function not covered" >function doBindEvent() <span class="cstat-no" title="statement not covered" >{</span></span>
<span class="cstat-no" title="statement not covered" > t</span>his.scrollEventListener = Utils.debounce(handleScrollEvent.bind(this), 200);
<span class="cstat-no" title="statement not covered" > t</span>his.scrollEventTarget = Utils.getScrollEventTarget(this.el);
&nbsp;
<span class="cstat-no" title="statement not covered" > v</span>ar disabledExpr = this.el.getAttribute('waterfall-disabled');
<span class="cstat-no" title="statement not covered" > v</span>ar disabled = false;
<span class="cstat-no" title="statement not covered" > if (disabledExpr) {</span>
<span class="cstat-no" title="statement not covered" > t</span>his.vm.$watch(disabledExpr, <span class="fstat-no" title="function not covered" >(value) =&gt; {</span>
<span class="cstat-no" title="statement not covered" > t</span>his.disabled = value;
});
<span class="cstat-no" title="statement not covered" > d</span>isabled = Boolean(this.vm[disabledExpr]);
}
<span class="cstat-no" title="statement not covered" > t</span>his.disabled = disabled;
&nbsp;
<span class="cstat-no" title="statement not covered" > v</span>ar offset = this.el.getAttribute('waterfall-offset');
<span class="cstat-no" title="statement not covered" > t</span>his.offset = Number(offset) || OFFSET;
&nbsp;
<span class="cstat-no" title="statement not covered" > t</span>his.scrollEventTarget.addEventListener('scroll', this.scrollEventListener);
&nbsp;
<span class="cstat-no" title="statement not covered" > t</span>his.scrollEventListener();
}
&nbsp;
// 处理滚动函数
<span class="fstat-no" title="function not covered" >function handleScrollEvent() {</span>
<span class="cstat-no" title="statement not covered" > l</span>et element = this.el;
<span class="cstat-no" title="statement not covered" > l</span>et scrollEventTarget = this.scrollEventTarget;
&nbsp;
// 已被禁止的滚动处理
<span class="cstat-no" title="statement not covered" > if (this.disabled) <span class="cstat-no" title="statement not covered" >r</span></span>eturn;
&nbsp;
<span class="cstat-no" title="statement not covered" > l</span>et targetScrollTop = Utils.getScrollTop(scrollEventTarget);
<span class="cstat-no" title="statement not covered" > l</span>et targetBottom = targetScrollTop + Utils.getVisibleHeight(scrollEventTarget);
&nbsp;
// 判断是否到了底
<span class="cstat-no" title="statement not covered" > l</span>et needLoadMoreToLower = false;
<span class="cstat-no" title="statement not covered" > if (element === scrollEventTarget) {</span>
<span class="cstat-no" title="statement not covered" > n</span>eedLoadMoreToLower = scrollEventTarget.scollHeight - targetBottom &lt; this.offset;
} else {
<span class="cstat-no" title="statement not covered" > l</span>et elementBottom = Utils.getElementTop(element) - Utils.getElementTop(scrollEventTarget) + Utils.getVisibleHeight(element);
<span class="cstat-no" title="statement not covered" > n</span>eedLoadMoreToLower = elementBottom - Utils.getVisibleHeight(scrollEventTarget) &lt; this.offset;
}
<span class="cstat-no" title="statement not covered" > if (needLoadMoreToLower) {</span>
<span class="cstat-no" title="statement not covered" > t</span>his.cb['lower'] &amp;&amp; this.cb['lower']({ target: scrollEventTarget, top: targetScrollTop });
}
&nbsp;
// 判断是否到了顶
<span class="cstat-no" title="statement not covered" > l</span>et needLoadMoreToUpper = false;
<span class="cstat-no" title="statement not covered" > if (element === scrollEventTarget) {</span>
<span class="cstat-no" title="statement not covered" > n</span>eedLoadMoreToUpper = targetScrollTop &lt; this.offset;
} else {
<span class="cstat-no" title="statement not covered" > l</span>et elementTop = Utils.getElementTop(element) - Utils.getElementTop(scrollEventTarget);
<span class="cstat-no" title="statement not covered" > n</span>eedLoadMoreToUpper = elementTop + this.offset &gt; 0;
}
<span class="cstat-no" title="statement not covered" > if (needLoadMoreToUpper) {</span>
<span class="cstat-no" title="statement not covered" > t</span>his.cb['upper'] &amp;&amp; this.cb['upper']({ target: scrollEventTarget, top: targetScrollTop });
}
}
&nbsp;
export default function(type) {
return <span class="fstat-no" title="function not covered" ><span class="fstat-no" title="function not covered" ><span class="fstat-no" title="function not covered" >{</span></span></span>
bind(el, binding, vnode) {
<span class="cstat-no" title="statement not covered" > if (!el[CONTEXT]) {</span>
<span class="cstat-no" title="statement not covered" > e</span>l[CONTEXT] = {
el,
vm: vnode.context,
cb: {}
};
}
<span class="cstat-no" title="statement not covered" > e</span>l[CONTEXT].cb[type] = binding.value;
&nbsp;
<span class="cstat-no" title="statement not covered" > v</span>node.context.$on('hook:mounted', <span class="fstat-no" title="function not covered" >function() {</span>
<span class="cstat-no" title="statement not covered" > if (Utils.isAttached(el)) {</span>
<span class="cstat-no" title="statement not covered" > d</span>oBindEvent.call(el[CONTEXT]);
}
});
},
&nbsp;
update(el) {
<span class="cstat-no" title="statement not covered" > e</span>l[CONTEXT].scrollEventListener();
},
&nbsp;
unbind(el) {
<span class="cstat-no" title="statement not covered" > c</span>onst context = el[CONTEXT];
<span class="cstat-no" title="statement not covered" > c</span>ontext.scrollEventTarget.removeEventListener('scroll', context.scrollEventListener);
}
};
};
&nbsp;
&nbsp;</pre></td></tr>
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