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83 lines
2.8 KiB
JavaScript
83 lines
2.8 KiB
JavaScript
3 years ago
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/**
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* @class Ext.ux.data.PagingMemoryProxy
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* @extends Ext.data.proxy.Memory
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* <p>Paging Memory Proxy, allows to use paging grid with in memory dataset</p>
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*/
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Ext.define('Ext.ux.data.PagingMemoryProxy', {
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extend: 'Ext.data.proxy.Memory',
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alias: 'proxy.pagingmemory',
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alternateClassName: 'Ext.data.PagingMemoryProxy',
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read : function(operation, callback, scope){
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var reader = this.getReader(),
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result = reader.read(this.data),
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sorters, filters, sorterFn, records;
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scope = scope || this;
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// filtering
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filters = operation.filters;
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if (filters.length > 0) {
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//at this point we have an array of Ext.util.Filter objects to filter with,
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//so here we construct a function that combines these filters by ANDing them together
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records = [];
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Ext.each(result.records, function(record) {
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var isMatch = true,
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length = filters.length,
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i;
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for (i = 0; i < length; i++) {
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var filter = filters[i],
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fn = filter.filterFn,
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scope = filter.scope;
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isMatch = isMatch && fn.call(scope, record);
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}
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if (isMatch) {
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records.push(record);
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}
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}, this);
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result.records = records;
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result.totalRecords = result.total = records.length;
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}
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// sorting
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sorters = operation.sorters;
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if (sorters.length > 0) {
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//construct an amalgamated sorter function which combines all of the Sorters passed
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sorterFn = function(r1, r2) {
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var result = sorters[0].sort(r1, r2),
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length = sorters.length,
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i;
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//if we have more than one sorter, OR any additional sorter functions together
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for (i = 1; i < length; i++) {
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result = result || sorters[i].sort.call(this, r1, r2);
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}
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return result;
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};
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result.records.sort(sorterFn);
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}
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// paging (use undefined cause start can also be 0 (thus false))
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if (operation.start !== undefined && operation.limit !== undefined) {
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result.records = result.records.slice(operation.start, operation.start + operation.limit);
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result.count = result.records.length;
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}
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Ext.apply(operation, {
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resultSet: result
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});
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operation.setCompleted();
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operation.setSuccessful();
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Ext.Function.defer(function () {
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Ext.callback(callback, scope, [operation]);
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}, 10);
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}
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});
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