guy
8 years ago
16 changed files with 427 additions and 73 deletions
@ -0,0 +1,22 @@
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Demo.Func = BI.inherit(BI.Widget, { |
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props: { |
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baseCls: "demo-func" |
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}, |
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render: function () { |
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return { |
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type: "bi.list_view", |
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el: { |
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type: "bi.left" |
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}, |
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items: BI.map(Demo.CONSTANTS.ITEMS, function (i, item) { |
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return BI.extend({}, item, { |
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type: "bi.label", |
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width: 200, |
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height: 200, |
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text: (i + 1) + "." + item.text, |
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}); |
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}) |
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} |
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} |
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}); |
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BI.shortcut("demo.list_view", Demo.Func); |
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@ -0,0 +1,110 @@
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/** |
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* 表示当前对象 |
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* |
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* Created by GUY on 2017/5/23. |
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* @class BI.ListView |
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* @extends BI.Widget |
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*/ |
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BI.ListView = BI.inherit(BI.Widget, { |
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props: function () { |
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return { |
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baseCls: "bi-list-view", |
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overscanHeight: 100, |
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blockSize: 10, |
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scrollTop: 0, |
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el: {}, |
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items: [] |
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}; |
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}, |
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init: function () { |
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var self = this; |
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this.renderedIndex = -1; |
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this.cache = {}; |
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}, |
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render: function () { |
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var self = this, o = this.options; |
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return { |
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type: "bi.vertical", |
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items: [BI.extend({ |
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type: "bi.vertical", |
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scrolly: false, |
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ref: function () { |
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self.container = this; |
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} |
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}, o.el)], |
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element: this |
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} |
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}, |
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mounted: function () { |
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var self = this, o = this.options; |
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this._populate(); |
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this.element.scroll(function (e) { |
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o.scrollTop = self.element.scrollTop(); |
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self._calculateBlocksToRender(); |
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}); |
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BI.ResizeDetector.addResizeListener(this, function () { |
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self._calculateBlocksToRender(); |
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}); |
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}, |
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_renderMoreIf: function () { |
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var self = this, o = this.options; |
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var height = this.element.height(); |
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var minContentHeight = o.scrollTop + height + o.overscanHeight; |
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var index = (this.cache[this.renderedIndex] && (this.cache[this.renderedIndex].index + o.blockSize)) || 0, |
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cnt = this.renderedIndex + 1; |
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var lastHeight; |
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var getElementHeight = function () { |
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return self.container.element.height(); |
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}; |
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while ((lastHeight = getElementHeight()) < minContentHeight && index < o.items.length) { |
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var items = o.items.slice(index, index + o.blockSize); |
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this.container.addItems(items); |
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var addedHeight = getElementHeight() - lastHeight; |
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this.cache[cnt] = { |
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index: index, |
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scrollTop: lastHeight, |
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height: addedHeight |
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}; |
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this.renderedIndex = cnt; |
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cnt++; |
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index += o.blockSize; |
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} |
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}, |
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_calculateBlocksToRender: function () { |
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var o = this.options; |
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this._renderMoreIf(); |
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}, |
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_populate: function (items) { |
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var o = this.options; |
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if (items && this.options.items !== items) { |
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this.options.items = items; |
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} |
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this._calculateBlocksToRender(); |
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this.element.scrollTop(o.scrollTop); |
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}, |
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restore: function () { |
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this.renderedIndex = -1; |
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this.container.empty(); |
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this.cache = {}; |
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}, |
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populate: function (items) { |
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if (items && this.options.items !== items) { |
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this.restore(); |
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} |
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this._populate(); |
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}, |
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destroyed: function () { |
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this.restore(); |
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} |
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}); |
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BI.shortcut('bi.list_view', BI.ListView); |
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