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/* <copyright>
This file contains proprietary software owned by Motorola Mobility, Inc.<br/>
No rights, expressed or implied, whatsoever to this software are provided by Motorola Mobility, Inc. hereunder.<br/>
(c) Copyright 2011 Motorola Mobility, Inc. All Rights Reserved.
</copyright> */
/**
@module montage/ui/controller/paged-array-controller
@requires montage/core/core
@requires ui/controller/array-controller
@requires core/event/mutable-event
*/
var Montage = require("montage").Montage,
ArrayController = require("ui/controller/array-controller").ArrayController,
MutableEvent = require("core/event/mutable-event").MutableEvent;
/**
@class module:montage/ui/controller/paged-array-controller.PagedArrayController
@extends module:montage/ui/controller/array-controller.ArrayController
*/
exports.PagedArrayController = Montage.create(ArrayController,/** @lends module:montage/ui/controller/paged-array-controller.PagedArrayController# */ {
/**
Description TODO
@private
*/
_pageSize: {
value: 10
},
//changing this should recalculate pageIndex to contain first item of previous current page
// via gotoOffset ?
/**
Description TODO
@type {Function}
@default {Number} 10
*/
pageSize: {
get: function() {
return this._pageSize;
},
set: function(value) {
if (value !== this._pageSize) {
this._calculate(value, this._pageIndex, this._padding);
}
}
},
/**
Description TODO
@private
*/
_padding: {
value: 0
},
// changing this should change the organized object to have the new padding
/**
Description TODO
@type {Function}
@default {Number} 0
*/
padding: {
get: function() {
return this._padding;
},
set: function(value) {
if (value !== this._padding) {
this._calculate(this._pageSize, this._pageIndex, value);
}
}
},
/**
Description TODO
@private
*/
_pageIndex: {
value: 0,
enumerable: false
},
// changing this should change the start and endIndex
/**
Description TODO
@type {Function}
@default {Number} 0
*/
pageIndex: {
get: function() {
return this._pageIndex;
},
set: function(pageIndex) {
if (pageIndex !== this._pageIndex) {
pageIndex = pageIndex >= this.pageCount ? this.pageCount - 1 : pageIndex < 0 ? 0 : pageIndex;
this._calculate(this._pageSize, pageIndex, this._padding);
}
}
},
/**
Description TODO
@private
*/
_pageCount: {
value: null,
enumerable: false
},
/**
Description TODO
@type {Function}
@default null
*/
pageCount: {
get: function() {
return this._pageCount;
}
},
/**
Description TODO
@type {Function}
@default {Array} array
*/
pageNumber: {
dependencies: ["pageIndex"],
get: function() {
return this._pageIndex + 1;
}
},
/**
Description TODO
@private
*/
_calculate: {
value: function(pageSize, pageIndex, padding) {
var contentLength = this.content.length,
pageCount = this._pageCount,
startIndex, endIndex,
pageSizeChangeEvent,
pageIndexChangeEvent,
paddingChangeEvent,
pageCountChangeEvent,
startIndexChangeEvent,
endIndexChangeEvent;
if (pageSize !== this._pageSize) {
pageSizeChangeEvent = MutableEvent.changeEventForKeyAndValue("pageSize", this._pageSize);
this._pageSize = pageSize;
}
if (pageIndex !== this._pageIndex) {
pageIndexChangeEvent = MutableEvent.changeEventForKeyAndValue("pageIndex", this._pageIndex);
this._pageIndex = pageIndex;
}
if (padding !== this._padding) {
paddingChangeEvent = MutableEvent.changeEventForKeyAndValue("padding", this._padding);
this._padding = padding;
}
pageCountChangeEvent = MutableEvent.changeEventForKeyAndValue("pageCount", pageCount);
this._pageCount = pageCount = Math.ceil(contentLength / pageSize);
startIndexChangeEvent = MutableEvent.changeEventForKeyAndValue("startIndex", this._startIndex);
startIndex = pageIndex * pageSize - padding;
this._startIndex = startIndex = startIndex < 0 ? 0 : startIndex;
endIndexChangeEvent = MutableEvent.changeEventForKeyAndValue("endIndex", this._endIndex);
endIndex = pageIndex * pageSize + pageSize + padding;
this._endIndex = endIndex = endIndex > contentLength ? contentLength : endIndex;
if (pageCountChangeEvent.minus !== pageCount) {
this.dispatchEvent(pageCountChangeEvent.withPlusValue(pageCount));
}
if (startIndexChangeEvent.minus !== startIndex) {
this.dispatchEvent(startIndexChangeEvent.withPlusValue(startIndex));
}
if (endIndexChangeEvent.minus !== endIndex) {
this.dispatchEvent(endIndexChangeEvent.withPlusValue(endIndex));
}
if (pageSizeChangeEvent) {
this.dispatchEvent(pageSizeChangeEvent.withPlusValue(pageSize));
}
if (pageIndexChangeEvent) {
this.dispatchEvent(pageIndexChangeEvent.withPlusValue(pageIndex));
}
if (paddingChangeEvent) {
this.dispatchEvent(paddingChangeEvent.withPlusValue(padding));
}
}
},
/**
Description TODO
@function
*/
gotoFirstPage: {
value: function() {
this.gotoPage(0);
}
},
/**
Description TODO
@function
*/
gotoLastPage: {
value: function() {
this.gotoPage(this.pageCount - 1);
}
},
/**
Description TODO
@function
*/
gotoNextPage: {
value: function() {
this.gotoPage(this.pageIndex + 1);
}
},
/**
Description TODO
@function
*/
gotoPreviousPage: {
value: function() {
this.gotoPage(this.pageIndex - 1);
}
},
/**
Sets the currentPage so that the desired item is contained in that page.
@function
@param {Array} pageIndex The index of the item to be shown.
*/
gotoPage: {
value: function(pageIndex) {
this.pageIndex = pageIndex;
}
},
/**
Sets the currentPage so that the desired item is contained in that page.
@function
@param {Math} offset The index of the item to be shown.
*/
gotoContentIndex: {
value: function(offset) {
this.gotoPage(Math.floor(offset / this.pageSize));
}
},
/**
Description TODO
@type {Function}
@default null
*/
content: {
get: function() {
return Object.getPropertyDescriptor(ArrayController, "content").get.call(this);
},
set: function(value) {
if (value !== this.content) {
Object.getPropertyDescriptor(ArrayController, "content").set.call(this, value);
this._calculate(this._pageSize, this._pageIndex, this._padding);
}
}
}
});
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