{
	"id": "173972",
	"key": "TIMOB-27303",
	"fields": {
		"issuetype": {
			"id": "1",
			"description": "A problem which impairs or prevents the functions of the product.",
			"name": "Bug",
			"subtask": false
		},
		"project": {
			"id": "10153",
			"key": "TIMOB",
			"name": "Titanium SDK/CLI",
			"projectCategory": {
				"id": "10100",
				"description": "Titanium and related SDKs used in application development",
				"name": "Client"
			}
		},
		"fixVersions": [],
		"resolution": {
			"id": "10100",
			"description": "This issue won't be actioned.",
			"name": "Won't Do"
		},
		"resolutiondate": "2020-05-15T18:25:20.000+0000",
		"created": "2019-08-02T13:48:28.000+0000",
		"priority": {
			"name": "High",
			"id": "2"
		},
		"labels": [],
		"versions": [
			{
				"id": "20060",
				"description": "",
				"name": "Release 7.0.2",
				"archived": false,
				"released": true,
				"releaseDate": "2018-02-09"
			},
			{
				"id": "20791",
				"name": "Release 8.0.2",
				"archived": false,
				"released": true,
				"releaseDate": "2019-06-18"
			}
		],
		"issuelinks": [
			{
				"id": "57810",
				"type": {
					"id": "10003",
					"name": "Relates",
					"inward": "relates to",
					"outward": "relates to"
				},
				"inwardIssue": {
					"id": "174014",
					"key": "TIMOB-27335",
					"fields": {
						"summary": "Windows: TableView constantly fires scrollend during mouse drag",
						"status": {
							"description": "The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.",
							"name": "Closed",
							"id": "6",
							"statusCategory": {
								"id": 3,
								"key": "done",
								"colorName": "green",
								"name": "Done"
							}
						},
						"priority": {
							"name": "High",
							"id": "2"
						},
						"issuetype": {
							"id": "1",
							"description": "A problem which impairs or prevents the functions of the product.",
							"name": "Bug",
							"subtask": false
						}
					}
				}
			}
		],
		"assignee": null,
		"updated": "2020-05-15T18:25:26.000+0000",
		"status": {
			"description": "The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.",
			"name": "Closed",
			"id": "6",
			"statusCategory": {
				"id": 3,
				"key": "done",
				"colorName": "green",
				"name": "Done"
			}
		},
		"components": [
			{
				"id": "12642",
				"name": "Windows",
				"description": "Windows authoring support"
			}
		],
		"description": "Hello!\r\nScroll event attached in Ti.UI.createTableView. After scroll event-triggered then the user wants to refresh table view. While scrolling, the table view shows blank.\r\nThis is happening in Windows 10 app (UWP) but working fine in android/iOS\r\n\r\nTeste project: TestUWP.zip\r\n*Steps to reproduce:*\r\n1. Import attached project.\r\n2. Build with sdk 8.0.2.GA or 7.0.2.GA on Windows 10 uwp apps on Windows Desktop\r\n3. Scroll the table view\r\n4.  It showing blank\r\n\r\n{code}\r\nOperating System\r\n  Name                        = Microsoft Windows 10 Pro\r\n  Version                     = 10.0.17134\r\n  Architecture                = 32bit\r\n  # CPUs                      = 4\r\n  Memory                      = 17091956736\r\nNode.js\r\n  Node.js Version             = 8.9.1\r\n  npm Version                 = 5.5.1\r\nTitanium CLI\r\n  CLI Version                 = 5.1.1\r\nTitanium SDK\r\n  SDK Version                 = 8.0.2.GA\r\n  SDK Path                    = C:\\ProgramData\\Titanium\\mobilesdk\\win32\\8.0.2.GA\r\n  Target Platform             = windows\r\n{code}\r\n\r\nThanks \r\n\r\n",
		"attachment": [
			{
				"id": "66799",
				"filename": "TestUWP.zip",
				"author": {
					"name": "aislam",
					"key": "aislam",
					"displayName": "Aminul Islam",
					"active": false,
					"timeZone": "Etc/GMT-6"
				},
				"created": "2019-08-02T13:44:17.000+0000",
				"size": 101637,
				"mimeType": "application/zip"
			}
		],
		"flagged": false,
		"summary": "Windows: Issue with TableView scrollend event (Windows 10 uwp apps)",
		"creator": {
			"name": "aislam",
			"key": "aislam",
			"displayName": "Aminul Islam",
			"active": false,
			"timeZone": "Etc/GMT-6"
		},
		"subtasks": [],
		"reporter": {
			"name": "aislam",
			"key": "aislam",
			"displayName": "Aminul Islam",
			"active": false,
			"timeZone": "Etc/GMT-6"
		},
		"environment": "Operating System\r\n  Name                        = Microsoft Windows 10 Pro\r\n  Version                     = 10.0.17134\r\n  Architecture                = 32bit\r\n  # CPUs                      = 4\r\n  Memory                      = 17091956736\r\nNode.js\r\n  Node.js Version             = 8.9.1\r\n  npm Version                 = 5.5.1\r\nTitanium CLI\r\n  CLI Version                 = 5.1.1\r\nTitanium SDK\r\n  SDK Version                 = 8.0.2.GA\r\n  SDK Path                    = C:\\ProgramData\\Titanium\\mobilesdk\\win32\\8.0.2.GA\r\n  Target Platform             = windows",
		"closedSprints": [
			{
				"id": 1170,
				"state": "closed",
				"name": "2019 Sprint 23",
				"startDate": "2019-11-04T18:38:14.526Z",
				"endDate": "2019-11-17T18:38:00.000Z",
				"completeDate": "2019-11-18T16:38:18.423Z",
				"originBoardId": 114
			},
			{
				"id": 1172,
				"state": "closed",
				"name": "2019 Sprint 25",
				"startDate": "2019-12-02T23:08:39.644Z",
				"endDate": "2019-12-15T23:08:00.000Z",
				"completeDate": "2019-12-16T05:54:54.518Z",
				"originBoardId": 114
			}
		],
		"comment": {
			"comments": [
				{
					"id": "450492",
					"author": {
						"name": "kiguchi",
						"key": "kota",
						"displayName": "Kota Iguchi",
						"active": false,
						"timeZone": "America/Los_Angeles"
					},
					"body": "So it turns out the reason why table view shows blank is because UI is too busy rendering the table view. \r\nWe see there are multiple reasons there;\r\n\r\nh2. Updating {{TableView.data}} causes re-creating of _entire_ table view row\r\n\r\nIn the {{scrollend}} event in [^TestUWP.zip] shows that you update {{TableView.data}} property with empty array, and the update with concatenated array like below:\r\n\r\n{code}\r\ntblPartsList.addEventListener('scrollend', function(e){\r\n  var cData = generateRamdomArray();\r\n  searchedResult = searchedResult.concat(cData);\r\n    \t\t\r\n  tblPartsList.data = [];\r\n  tblPartsList.data = searchedResult;\r\n});\r\n{code}\r\n\r\nHowever, this cause _re-creation of entire table view row_ despite you only want to append new rows. Instead of doing this, following code would be much better because this does not re-create entire table view rows.\r\n\r\n{code}\r\ntblPartsList.addEventListener('scrollend', function(e){\r\n  var cData = generateRamdomArray();    \t\t\r\n  tblPartsList.appendRow(cData);\r\n});\r\n{code}\r\n\r\nh2. {{scrollend}} is fired too often when you drag scroll bar on Windows desktop\r\n\r\nWe see that Windows desktop TableView fires {{scrollend}} too often when you drag scroll bar. This is because Windows UWP component actually fires the event too often and Titanium is only forwarding the event acoordingly:( FYI this does not happen when you click (not drag) scroll bar arrow button so I would think this is platform component behavior bug but TIMOB-27335 will be taking care of this to try to suppress this.\r\n\r\nh2. Windows TableView is basically heavy weight UI component\r\n\r\nWindows {{TableView}} and {{ListView}} is relatively heavy weight UI component. You might want to check out the https://github.com/appcelerator-modules/ti.xaml.listview - we have much more lightweight module to represent tables -   in case you want to push lot more rows to the table.\r\n",
					"updateAuthor": {
						"name": "kiguchi",
						"key": "kota",
						"displayName": "Kota Iguchi",
						"active": false,
						"timeZone": "America/Los_Angeles"
					},
					"created": "2019-08-15T04:36:48.000+0000",
					"updated": "2019-08-15T04:38:09.000+0000"
				},
				{
					"id": "450813",
					"author": {
						"name": "kiguchi",
						"key": "kota",
						"displayName": "Kota Iguchi",
						"active": false,
						"timeZone": "America/Los_Angeles"
					},
					"body": "https://github.com/appcelerator/titanium_mobile_windows/pull/1422",
					"updateAuthor": {
						"name": "kiguchi",
						"key": "kota",
						"displayName": "Kota Iguchi",
						"active": false,
						"timeZone": "America/Los_Angeles"
					},
					"created": "2019-08-26T04:11:35.000+0000",
					"updated": "2019-08-26T04:11:35.000+0000"
				}
			],
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