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210 lines
4.6 KiB
210 lines
4.6 KiB
var DataView = require('../DataView');
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/**
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* @class Filter
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*
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* @param {DataGroup} dataGroup the data group
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* @param {Number} column The index of the column to be filtered
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* @param {Graph} graph The graph
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*/
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function Filter (dataGroup, column, graph) {
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this.dataGroup = dataGroup;
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this.column = column;
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this.graph = graph; // the parent graph
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this.index = undefined;
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this.value = undefined;
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// read all distinct values and select the first one
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this.values = dataGroup.getDistinctValues(this.column);
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if (this.values.length > 0) {
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this.selectValue(0);
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}
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// create an array with the filtered datapoints. this will be loaded afterwards
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this.dataPoints = [];
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this.loaded = false;
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this.onLoadCallback = undefined;
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if (graph.animationPreload) {
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this.loaded = false;
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this.loadInBackground();
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}
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else {
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this.loaded = true;
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}
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}
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/**
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* Return the label
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* @return {string} label
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*/
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Filter.prototype.isLoaded = function() {
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return this.loaded;
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};
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/**
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* Return the loaded progress
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* @return {Number} percentage between 0 and 100
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*/
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Filter.prototype.getLoadedProgress = function() {
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var len = this.values.length;
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var i = 0;
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while (this.dataPoints[i]) {
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i++;
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}
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return Math.round(i / len * 100);
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};
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/**
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* Return the label
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* @return {string} label
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*/
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Filter.prototype.getLabel = function() {
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return this.graph.filterLabel;
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};
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/**
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* Return the columnIndex of the filter
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* @return {Number} columnIndex
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*/
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Filter.prototype.getColumn = function() {
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return this.column;
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};
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/**
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* Return the currently selected value. Returns undefined if there is no selection
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* @return {*} value
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*/
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Filter.prototype.getSelectedValue = function() {
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if (this.index === undefined)
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return undefined;
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return this.values[this.index];
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};
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/**
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* Retrieve all values of the filter
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* @return {Array} values
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*/
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Filter.prototype.getValues = function() {
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return this.values;
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};
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/**
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* Retrieve one value of the filter
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* @param {Number} index
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* @return {*} value
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*/
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Filter.prototype.getValue = function(index) {
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if (index >= this.values.length)
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throw new Error('Index out of range');
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return this.values[index];
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};
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/**
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* Retrieve the (filtered) dataPoints for the currently selected filter index
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* @param {Number} [index] (optional)
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* @return {Array} dataPoints
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*/
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Filter.prototype._getDataPoints = function(index) {
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if (index === undefined)
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index = this.index;
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if (index === undefined)
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return [];
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var dataPoints;
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if (this.dataPoints[index]) {
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dataPoints = this.dataPoints[index];
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}
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else {
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var f = {};
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f.column = this.column;
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f.value = this.values[index];
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var dataView = new DataView(this.dataGroup.getDataSet(), {filter: function (item) {return (item[f.column] == f.value);}}).get();
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dataPoints = this.dataGroup._getDataPoints(dataView);
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this.dataPoints[index] = dataPoints;
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}
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return dataPoints;
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};
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/**
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* Set a callback function when the filter is fully loaded.
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*/
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Filter.prototype.setOnLoadCallback = function(callback) {
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this.onLoadCallback = callback;
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};
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/**
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* Add a value to the list with available values for this filter
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* No double entries will be created.
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* @param {Number} index
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*/
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Filter.prototype.selectValue = function(index) {
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if (index >= this.values.length)
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throw new Error('Index out of range');
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this.index = index;
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this.value = this.values[index];
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};
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/**
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* Load all filtered rows in the background one by one
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* Start this method without providing an index!
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*/
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Filter.prototype.loadInBackground = function(index) {
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if (index === undefined)
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index = 0;
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var frame = this.graph.frame;
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if (index < this.values.length) {
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// create a progress box
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if (frame.progress === undefined) {
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frame.progress = document.createElement('DIV');
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frame.progress.style.position = 'absolute';
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frame.progress.style.color = 'gray';
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frame.appendChild(frame.progress);
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}
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var progress = this.getLoadedProgress();
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frame.progress.innerHTML = 'Loading animation... ' + progress + '%';
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// TODO: this is no nice solution...
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frame.progress.style.bottom = 60 + 'px'; // TODO: use height of slider
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frame.progress.style.left = 10 + 'px';
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var me = this;
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setTimeout(function() {me.loadInBackground(index+1);}, 10);
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this.loaded = false;
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}
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else {
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this.loaded = true;
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// remove the progress box
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if (frame.progress !== undefined) {
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frame.removeChild(frame.progress);
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frame.progress = undefined;
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}
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if (this.onLoadCallback)
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this.onLoadCallback();
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}
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};
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module.exports = Filter;
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