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-rw-r--r--slick.model.js462
1 files changed, 231 insertions, 231 deletions
diff --git a/slick.model.js b/slick.model.js
index e4cf831..ec2be94 100644
--- a/slick.model.js
+++ b/slick.model.js
@@ -1,231 +1,231 @@
-/***
- * A simple observer pattern implementation.
- */
-function EventHelper() {
- this.handlers = [];
-
- this.subscribe = function(fn) {
- this.handlers.push(fn);
- }
-
- this.notify = function(args) {
- for (var i = 0; i < this.handlers.length; i++) {
- this.handlers[i].call(this, args);
- }
- }
-
- return this;
-}
-
-
-
-/***
- * A sample Model implementation.
- * Provides a filtered view of the underlying data.
- *
- * Relies on the data item having an "id" property uniquely identifying it.
- */
-function DataView() {
- var self = this;
-
- // private
- var items = []; // data by index
- var rows = []; // data by row
- var idxById = {}; // indexes by id
- var rowsById = null; // rows by id; lazy-calculated
- var filter = null; // filter function
- var updated = null; // updated item ids
- var suspend = false; // suspends the recalculation
-
- var pagesize = 0;
- var pagenum = 0;
- var totalRows = 0;
-
- // events
- var onRowCountChanged = new EventHelper();
- var onRowsChanged = new EventHelper();
- var onPagingInfoChanged = new EventHelper();
-
-
- function beginUpdate() {
- suspend = true;
- }
-
- function endUpdate() {
- suspend = false;
- refresh();
- }
-
- function setItems(data) {
- items = data.concat();
- for (var i=0,l=items.length; i<l; i++) {
- var id = items[i].id;
- if (id == undefined || idxById[id] != undefined)
- throw "Each data element must implement a unique 'id' property";
- idxById[id] = i;
- }
- refresh();
- }
-
- function setPagingOptions(args) {
- if (args.pageSize != undefined)
- pagesize = args.pageSize;
-
- if (args.pageNum != undefined)
- pagenum = Math.min(args.pageNum, Math.ceil(totalRows/pagesize));
-
- onPagingInfoChanged.notify(getPagingInfo());
-
- refresh();
- }
-
- function getPagingInfo() {
- return {pageSize:pagesize, pageNum:pagenum, totalRows:totalRows};
- }
-
- function sort(comparer) {
- items.sort(comparer);
- refresh();
- }
-
- function setFilter(filterFn) {
- filter = filterFn;
- refresh();
- }
-
- function getItemByIdx(i) {
- return items[i];
- }
-
- function getIdxById(id) {
- return idxById[id];
- }
-
- // calculate the lookup table on first call
- function getRowById(id) {
- if (!rowsById) {
- rowsById = {};
- for (var i=0, l=rows.length; i<l; ++i) {
- rowsById[rows[i].id] = i;
- }
- }
-
- return rowsById[id];
- }
-
- function getItemById(id) {
- return items[idxById[id]];
- }
-
- function updateItem(id,item) {
- items[idxById[id]] = item;
- if (!updated) updated = {};
- updated[id] = true;
- refresh();
- }
-
- function insertItem(insertBefore,item) {
- items.splice(insertBefore,0,item);
- refresh();
- }
-
- function addItem(item) {
- items.push(item);
- refresh();
- }
-
- function deleteItem(id) {
- items.splice(idxById[id],1);
- refresh();
- }
-
- function recalc(_items,_rows,_filter,_updated) {
- var diff = [];
- var items=_items, rows=_rows, filter=_filter, updated=_updated; // cache as local vars
-
- rowsById = null;
-
- // go over all items remapping them to rows on the fly
- // while keeping track of the differences and updating indexes
- var rl = rows.length;
- var currentRowIndex = 0;
- var currentPageIndex = 0;
- var item,id;
-
- for (var i = 0, il = items.length; i < il; ++i) {
- item = items[i];
- id = item.id;
-
- if (!filter || filter(item)) {
- if (!pagesize || (currentRowIndex >= pagesize * pagenum && currentRowIndex < pagesize * (pagenum + 1))) {
- if (currentPageIndex >= rl || id != rows[currentPageIndex].id || (updated && updated[id]))
- diff[diff.length] = currentPageIndex;
-
- rows[currentPageIndex] = item;
- currentPageIndex++;
- }
-
- currentRowIndex++;
- }
- }
-
- if (rl > currentPageIndex)
- rows.splice(currentPageIndex, rl - currentPageIndex);
-
- totalRows = currentRowIndex;
-
- return diff;
- }
-
- function refresh() {
- if (suspend) return;
-
- var countBefore = rows.length;
- var totalRowsBefore = totalRows;
-
- var diff = recalc(items,rows,filter,updated); // pass as direct refs to avoid closure perf hit
-
- // if the current page is no longer valid, go to last page and recalc
- // we suffer a performance penalty here, but the main loop (recalc) remains highly optimized
- if (pagesize && totalRows < pagenum*pagesize) {
- pagenum = Math.floor(totalRows/pagesize);
- diff = recalc(items,rows,filter,updated);
- }
-
- updated = null;
-
- if (totalRowsBefore != totalRows) onPagingInfoChanged.notify(getPagingInfo());
- if (countBefore != rows.length) onRowCountChanged.notify({previous:countBefore, current:rows.length});
- if (diff.length > 0 || countBefore != rows.length) onRowsChanged.notify(diff);
- }
-
-
-
- return {
- // properties
- "rows": rows, // note: neither the array or the data in it should be modified directly
-
- // methods
- "beginUpdate": beginUpdate,
- "endUpdate": endUpdate,
- "setPagingOptions": setPagingOptions,
- "getPagingInfo": getPagingInfo,
- "setItems": setItems,
- "setFilter": setFilter,
- "sort": sort,
- "getIdxById": getIdxById,
- "getRowById": getRowById,
- "getItemById": getItemById,
- "getItemByIdx": getItemByIdx,
- "refresh": refresh,
- "updateItem": updateItem,
- "insertItem": insertItem,
- "addItem": addItem,
- "deleteItem": deleteItem,
-
- // events
- "onRowCountChanged": onRowCountChanged,
- "onRowsChanged": onRowsChanged,
- "onPagingInfoChanged": onPagingInfoChanged
- };
-}
+/***
+ * A simple observer pattern implementation.
+ */
+function EventHelper() {
+ this.handlers = [];
+
+ this.subscribe = function(fn) {
+ this.handlers.push(fn);
+ }
+
+ this.notify = function(args) {
+ for (var i = 0; i < this.handlers.length; i++) {
+ this.handlers[i].call(this, args);
+ }
+ }
+
+ return this;
+}
+
+
+
+/***
+ * A sample Model implementation.
+ * Provides a filtered view of the underlying data.
+ *
+ * Relies on the data item having an "id" property uniquely identifying it.
+ */
+function DataView() {
+ var self = this;
+
+ // private
+ var items = []; // data by index
+ var rows = []; // data by row
+ var idxById = {}; // indexes by id
+ var rowsById = null; // rows by id; lazy-calculated
+ var filter = null; // filter function
+ var updated = null; // updated item ids
+ var suspend = false; // suspends the recalculation
+
+ var pagesize = 0;
+ var pagenum = 0;
+ var totalRows = 0;
+
+ // events
+ var onRowCountChanged = new EventHelper();
+ var onRowsChanged = new EventHelper();
+ var onPagingInfoChanged = new EventHelper();
+
+
+ function beginUpdate() {
+ suspend = true;
+ }
+
+ function endUpdate() {
+ suspend = false;
+ refresh();
+ }
+
+ function setItems(data) {
+ items = data.concat();
+ for (var i=0,l=items.length; i<l; i++) {
+ var id = items[i].id;
+ if (id == undefined || idxById[id] != undefined)
+ throw "Each data element must implement a unique 'id' property";
+ idxById[id] = i;
+ }
+ refresh();
+ }
+
+ function setPagingOptions(args) {
+ if (args.pageSize != undefined)
+ pagesize = args.pageSize;
+
+ if (args.pageNum != undefined)
+ pagenum = Math.min(args.pageNum, Math.ceil(totalRows/pagesize));
+
+ onPagingInfoChanged.notify(getPagingInfo());
+
+ refresh();
+ }
+
+ function getPagingInfo() {
+ return {pageSize:pagesize, pageNum:pagenum, totalRows:totalRows};
+ }
+
+ function sort(comparer) {
+ items.sort(comparer);
+ refresh();
+ }
+
+ function setFilter(filterFn) {
+ filter = filterFn;
+ refresh();
+ }
+
+ function getItemByIdx(i) {
+ return items[i];
+ }
+
+ function getIdxById(id) {
+ return idxById[id];
+ }
+
+ // calculate the lookup table on first call
+ function getRowById(id) {
+ if (!rowsById) {
+ rowsById = {};
+ for (var i=0, l=rows.length; i<l; ++i) {
+ rowsById[rows[i].id] = i;
+ }
+ }
+
+ return rowsById[id];
+ }
+
+ function getItemById(id) {
+ return items[idxById[id]];
+ }
+
+ function updateItem(id,item) {
+ items[idxById[id]] = item;
+ if (!updated) updated = {};
+ updated[id] = true;
+ refresh();
+ }
+
+ function insertItem(insertBefore,item) {
+ items.splice(insertBefore,0,item);
+ refresh();
+ }
+
+ function addItem(item) {
+ items.push(item);
+ refresh();
+ }
+
+ function deleteItem(id) {
+ items.splice(idxById[id],1);
+ refresh();
+ }
+
+ function recalc(_items,_rows,_filter,_updated) {
+ var diff = [];
+ var items=_items, rows=_rows, filter=_filter, updated=_updated; // cache as local vars
+
+ rowsById = null;
+
+ // go over all items remapping them to rows on the fly
+ // while keeping track of the differences and updating indexes
+ var rl = rows.length;
+ var currentRowIndex = 0;
+ var currentPageIndex = 0;
+ var item,id;
+
+ for (var i = 0, il = items.length; i < il; ++i) {
+ item = items[i];
+ id = item.id;
+
+ if (!filter || filter(item)) {
+ if (!pagesize || (currentRowIndex >= pagesize * pagenum && currentRowIndex < pagesize * (pagenum + 1))) {
+ if (currentPageIndex >= rl || id != rows[currentPageIndex].id || (updated && updated[id]))
+ diff[diff.length] = currentPageIndex;
+
+ rows[currentPageIndex] = item;
+ currentPageIndex++;
+ }
+
+ currentRowIndex++;
+ }
+ }
+
+ if (rl > currentPageIndex)
+ rows.splice(currentPageIndex, rl - currentPageIndex);
+
+ totalRows = currentRowIndex;
+
+ return diff;
+ }
+
+ function refresh() {
+ if (suspend) return;
+
+ var countBefore = rows.length;
+ var totalRowsBefore = totalRows;
+
+ var diff = recalc(items,rows,filter,updated); // pass as direct refs to avoid closure perf hit
+
+ // if the current page is no longer valid, go to last page and recalc
+ // we suffer a performance penalty here, but the main loop (recalc) remains highly optimized
+ if (pagesize && totalRows < pagenum*pagesize) {
+ pagenum = Math.floor(totalRows/pagesize);
+ diff = recalc(items,rows,filter,updated);
+ }
+
+ updated = null;
+
+ if (totalRowsBefore != totalRows) onPagingInfoChanged.notify(getPagingInfo());
+ if (countBefore != rows.length) onRowCountChanged.notify({previous:countBefore, current:rows.length});
+ if (diff.length > 0 || countBefore != rows.length) onRowsChanged.notify(diff);
+ }
+
+
+
+ return {
+ // properties
+ "rows": rows, // note: neither the array or the data in it should be modified directly
+
+ // methods
+ "beginUpdate": beginUpdate,
+ "endUpdate": endUpdate,
+ "setPagingOptions": setPagingOptions,
+ "getPagingInfo": getPagingInfo,
+ "setItems": setItems,
+ "setFilter": setFilter,
+ "sort": sort,
+ "getIdxById": getIdxById,
+ "getRowById": getRowById,
+ "getItemById": getItemById,
+ "getItemByIdx": getItemByIdx,
+ "refresh": refresh,
+ "updateItem": updateItem,
+ "insertItem": insertItem,
+ "addItem": addItem,
+ "deleteItem": deleteItem,
+
+ // events
+ "onRowCountChanged": onRowCountChanged,
+ "onRowsChanged": onRowsChanged,
+ "onPagingInfoChanged": onPagingInfoChanged
+ };
+}
generated by cgit v1.1 at 2025-05-30 04:34:50 +0000