Upgrade to ExtJS 4.0.0 - Released 04/26/2011

[extjs.git] / examples / ux / data / PagingMemoryProxy.js

diff --git a/examples/ux/data/PagingMemoryProxy.js b/examples/ux/data/PagingMemoryProxy.js
new file mode 100644 (file)
index 0000000..60e7c5d
--- /dev/null
+++ b/examples/ux/data/PagingMemoryProxy.js
@@ -0,0 +1,79 @@
+Ext.ns('Ext.ux.data');
+/**
+ * @class Ext.ux.data.PagingMemoryProxy
+ * @extends Ext.data.proxy.Memory
+ * <p>Paging Memory Proxy, allows to use paging grid with in memory dataset</p>
+ */
+Ext.define('Ext.ux.data.PagingMemoryProxy', {
+    extend: 'Ext.data.proxy.Memory',
+    alias: 'proxy.pagingmemory',
+    read : function(operation, callback, scope){
+        var reader = this.getReader(),
+            result = reader.read(this.data),
+            sorters, filters, sorterFn, records;
+
+        // filtering
+        filters = operation.filters;
+        if (filters.length > 0) {
+            //at this point we have an array of  Ext.util.Filter objects to filter with,
+            //so here we construct a function that combines these filters by ANDing them together
+            records = [];
+
+            Ext.each(result.records, function(record) {
+                var isMatch = true,
+                    length = filters.length,
+                    i;
+
+                for (i = 0; i < length; i++) {
+                    var filter = filters[i],
+                        fn     = filter.filterFn,
+                        scope  = filter.scope;
+
+                    isMatch = isMatch && fn.call(scope, record);
+                }
+                if (isMatch) {
+                    records.push(record);
+                }
+            }, this);
+
+            result.records = records;
+        }
+        
+        // sorting
+        sorters = operation.sorters;
+        if (sorters.length > 0) {
+            //construct an amalgamated sorter function which combines all of the Sorters passed
+            sorterFn = function(r1, r2) {
+                var result = sorters[0].sort(r1, r2),
+                    length = sorters.length,
+                    i;
+                
+                    //if we have more than one sorter, OR any additional sorter functions together
+                    for (i = 1; i < length; i++) {
+                        result = result || sorters[i].sort.call(this, r1, r2);
+                    }                
+               
+                return result;
+            };
+    
+            result.records.sort(sorterFn);
+        }
+        
+        // paging (use undefined cause start can also be 0 (thus false))
+        if (operation.start !== undefined && operation.limit !== undefined) {
+            result.records = result.records.slice(operation.start, operation.start + operation.limit);
+        }
+
+        Ext.apply(operation, {
+            resultSet: result
+        });
+        
+        operation.setCompleted();
+        operation.setSuccessful();
+
+        Ext.callback(callback, scope || me, [operation]);
+    }
+});
+
+//backwards compat.
+Ext.data.PagingMemoryProxy = Ext.ux.data.PagingMemoryProxy;