further improvements/fixes

This commit is contained in:
David Back 2018-09-24 10:28:37 -07:00
parent 074c3f2c7c
commit df48c60a8f
2 changed files with 196 additions and 173 deletions

View file

@ -20,7 +20,7 @@ const IMAGE_MODEL_NAME = 'default-image-model.fbx';
const COLLAPSE_EXTRA_INFO = "E";
const EXPAND_EXTRA_INFO = "D";
const FILTER_IN_VIEW_ATTRIBUTE = "pressed";
const WINDOW_NONVARIABLE_HEIGHT = 206;
const WINDOW_NONVARIABLE_HEIGHT = 207;
const NUM_COLUMNS = 12;
const EMPTY_ENTITY_ID = "0";
const DELETE = 46; // Key code for the delete key.
@ -68,7 +68,7 @@ var visibleEntities = [];
// List of all entities that are currently selected
var selectedEntities = [];
var entityList = null; // ListView
var entityList = null; // The ListView
var currentSortColumn = 'type';
var currentSortOrder = ASCENDING_SORT;
@ -178,11 +178,11 @@ function loaded() {
elInView.onclick = toggleFilterInView;
elRadius.onchange = onRadiusChange;
elInfoToggle.onclick = toggleInfo;
window.onresize = resize;
elNoEntitiesInView.style.display = "none";
entityList = new ListView("entity-table", "entity-table-body", "entity-table-scroll", createRow, updateRow, clearRow);
entityList = new ListView("entity-table", "entity-table-body", "entity-table-scroll",
createRow, updateRow, clearRow, resize, WINDOW_NONVARIABLE_HEIGHT);
function onRowClicked(clickEvent) {
let entityID = this.dataset.entityID;
@ -257,7 +257,7 @@ function loaded() {
function updateEntityData(entityData) {
entities = [];
entitiesByID = {};
visibleEntities = [];
visibleEntities.length = 0; // maintains itemData reference in ListView
PROFILE("map-data", function() {
entityData.forEach(function(entity) {
@ -282,7 +282,7 @@ function loaded() {
isBaked: entity.isBaked ? BAKED_GLYPH : null,
drawCalls: displayIfNonZero(entity.drawCalls),
hasScript: entity.hasScript ? SCRIPT_GLYPH : null,
elRow: null,
elRow: null, // if this entity has a row element assigned to it
selected: false
}
@ -317,9 +317,6 @@ function loaded() {
PROFILE("update-dom", function() {
entityList.itemData = visibleEntities;
if (visibleEntities.length < entityList.rowOffset) {
entityList.resetRowOffset();
}
entityList.refresh();
});
@ -330,6 +327,9 @@ function loaded() {
function removeEntities(deletedIDs) {
// Loop from the back so we can pop items off while iterating
// delete any entities matching deletedIDs list from entities and entitiesByID lists
// if the entity had an associated row element then ensure row is unselected and clear it's entity
for (let j = entities.length - 1; j >= 0; --j) {
let id = entities[j].id;
for (let i = 0, length = deletedIDs.length; i < length; ++i) {
@ -346,6 +346,7 @@ function loaded() {
}
}
// delete any entities matching deletedIDs list from selectedEntities list
for (let j = selectedEntities.length - 1; j >= 0; --j) {
let id = selectedEntities[j].id;
for (let i = 0, length = deletedIDs.length; i < length; ++i) {
@ -355,14 +356,32 @@ function loaded() {
}
}
}
// delete any entities matching deletedIDs list from visibleEntities list
// if this was a row that was above our current row offset (a hidden top row in the top buffer),
// then decrease row offset accordingly
let firstVisibleRow = entityList.getFirstVisibleRowIndex();
for (let j = visibleEntities.length - 1; j >= 0; --j) {
let id = visibleEntities[j].id;
for (let i = 0, length = deletedIDs.length; i < length; ++i) {
if (id === deletedIDs[i]) {
if (j < firstVisibleRow && entityList.rowOffset > 0) {
entityList.rowOffset--;
}
visibleEntities.splice(j, 1);
break;
}
}
}
entityList.removeItems(deletedIDs);
entityList.refresh();
refreshFooter();
refreshNoEntitiesMessage();
}
function clearEntities() {
// clear the associated entity ID from all visible row elements
let firstVisibleRow = entityList.getFirstVisibleRowIndex();
let lastVisibleRow = entityList.getLastVisibleRowIndex();
for (let i = firstVisibleRow; i <= lastVisibleRow && i < visibleEntities.length; i++) {
@ -372,9 +391,9 @@ function loaded() {
entities = [];
entitiesByID = {};
visibleEntities = [];
visibleEntities.length = 0; // maintains itemData reference in ListView
entityList.resetRowOffset();
entityList.resetToTop();
entityList.clear();
refreshFooter();
@ -439,6 +458,7 @@ function loaded() {
function updateSelectedEntities(selectedIDs) {
let notFound = false;
// reset all currently selected entities and their rows first
selectedEntities.forEach(function(id) {
let entity = entitiesByID[id];
if (entity !== undefined) {
@ -449,8 +469,8 @@ function loaded() {
}
});
// then reset selected entities list with newly selected entities and set them selected
selectedEntities = [];
selectedIDs.forEach(function(id) {
selectedEntities.push(id);
let entity = entitiesByID[id];
@ -489,6 +509,7 @@ function loaded() {
}
function updateRow(elRow, itemData) {
// update all column texts and glyphs to this entity's data
let typeCell = elRow.childNodes[COLUMN_INDEX.TYPE];
typeCell.innerText = itemData.type;
let nameCell = elRow.childNodes[COLUMN_INDEX.NAME];
@ -514,12 +535,16 @@ function loaded() {
let hasScriptCell = elRow.childNodes[COLUMN_INDEX.HAS_SCRIPT];
hasScriptCell.innerText = itemData.hasScript;
// if this entity was previously selected flag it's row as selected
if (itemData.selected) {
elRow.className = 'selected';
} else {
elRow.className = '';
}
// if this row previously had an associated entity ID that wasn't the new entity ID then clear
// the ID from the row and the row element from the previous entity's data, then set the new
// entity ID to the row and the row element to the new entity's data
let prevEntityID = elRow.dataset.entityID;
let newEntityID = itemData.id;
let validPrevItemID = prevEntityID !== undefined && prevEntityID !== EMPTY_ENTITY_ID;
@ -534,6 +559,7 @@ function loaded() {
}
function clearRow(elRow) {
// reset all texts and glyphs for each of the row's column
for (let i = 0; i < NUM_COLUMNS; i++) {
let cell = elRow.childNodes[i];
if (isGlyphColumn(i)) {
@ -543,22 +569,18 @@ function loaded() {
}
}
// clear the row from any associated entity
let entityID = elRow.dataset.entityID;
if (entityID && entitiesByID[entityID]) {
entitiesByID[entityID].elRow = null;
}
// reset the row to hidden and clear the entity from the row
elRow.className = '';
elRow.dataset.entityID = EMPTY_ENTITY_ID;
}
function resize() {
// Store current scroll position
let prevScrollTop = elEntityTableScroll.scrollTop;
// Take up available window space
elEntityTableScroll.style.height = window.innerHeight - 207;
let SCROLLABAR_WIDTH = 21;
let tds = document.querySelectorAll("#entity-table-body tr:first-child td");
let ths = document.querySelectorAll("#entity-table thead th");
@ -589,15 +611,8 @@ function loaded() {
ths[3].width = 0.08 * tableWidth;
ths[4].width = 0.08 * tableWidth;
}
}
// Reinitialize rows according to new table height and refresh row data
entityList.resetRows(window.innerHeight - WINDOW_NONVARIABLE_HEIGHT);
entityList.refresh();
// Restore scrolling to previous scroll position before resetting rows
elEntityTableScroll.scrollTop = prevScrollTop;
};
}
}
function toggleFilterInView() {
isFilterInView = !isFilterInView;
@ -614,14 +629,15 @@ function loaded() {
function onFilterChange() {
refreshEntityList();
resize();
entityList.resize();
}
function onRadiusChange() {
elRadius.value = Math.max(elRadius.value, 0);
elNoEntitiesRadius.firstChild.nodeValue = elRadius.value;
elNoEntitiesMessage.style.display = "none";
EventBridge.emitWebEvent(JSON.stringify({ type: 'radius', radius: elRadius.value }));
refreshEntities();
elNoEntitiesRadius.firstChild.nodeValue = elRadius.value;
}
function toggleInfo(event) {
@ -633,7 +649,7 @@ function loaded() {
elEntityTable.className = "";
elInfoToggleGlyph.innerHTML = EXPAND_EXTRA_INFO;
}
resize();
entityList.resize();
event.stopPropagation();
}
@ -644,7 +660,6 @@ function loaded() {
let keyCode = keyDownEvent.keyCode;
if (keyCode === DELETE) {
EventBridge.emitWebEvent(JSON.stringify({ type: 'delete' }));
refreshEntities();
}
if (keyDownEvent.keyCode === KEY_P && keyDownEvent.ctrlKey) {
if (keyDownEvent.shiftKey) {
@ -686,7 +701,6 @@ function loaded() {
});
}
resize();
refreshSortOrder();
refreshEntities();
});

View file

@ -13,7 +13,8 @@ debugPrint = function (message) {
console.log(message);
};
function ListView(tableId, tableBodyId, tableScrollId, createRowFunction, updateRowFunction, clearRowFunction) {
function ListView(tableId, tableBodyId, tableScrollId, createRowFunction, updateRowFunction,
clearRowFunction, resizeFunction, WINDOW_NONVARIABLE_HEIGHT) {
this.elTable = document.getElementById(tableId);
this.elTableBody = document.getElementById(tableBodyId);
this.elTableScroll = document.getElementById(tableScrollId);
@ -21,17 +22,22 @@ function ListView(tableId, tableBodyId, tableScrollId, createRowFunction, update
this.elTopBuffer = null;
this.elBottomBuffer = null;
this.elRows = [];
this.itemData = [];
this.createRowFunction = createRowFunction;
this.updateRowFunction = updateRowFunction;
this.clearRowFunction = clearRowFunction;
this.resizeFunction = resizeFunction;
// the list of row elements created in the table up to max viewable height plus SCROLL_ROWS rows for scrolling buffer
this.elRows = [];
// the list of all row item data to show in the scrolling table, passed to updateRowFunction to set to each row
this.itemData = [];
// the current index within the itemData list that is set to the top most elRow element
this.rowOffset = 0;
// height of the elRow elements
this.rowHeight = 0;
// the previous elTableScroll.scrollTop value when the elRows were last shifted for scrolling
this.lastRowShiftScrollTop = 0;
this.rowOffset = 0; // the current index within the itemData list used for the top most elRow element
this.rowHeight = 0; // height of the elRow elements
this.lastRowChangeScrollTop = 0; // the previous elTableScroll.scrollTop value when the rows were scrolled
this.initialize();
};
@ -52,144 +58,99 @@ ListView.prototype = {
return this.getFirstVisibleRowIndex() + entityList.getNumRows() - 1;
},
resetRowOffset: function() {
resetToTop: function() {
this.rowOffset = 0;
this.lastRowChangeScrollTop = 0;
},
removeItems: function(removeItems) {
let firstVisibleRow = this.getFirstVisibleRowIndex();
let lastVisibleRow = this.getLastVisibleRowIndex();
let prevRowOffset = this.rowOffset;
let prevTopHeight = parseInt(this.elTopBuffer.getAttribute("height"));
// remove items from our itemData list that match anything in the removeItems list
// if this was a row that was above our current row offset (a hidden top row in the top buffer),
// then decrease row offset accordingly
let deletedHiddenTopRows = false;
let deletedVisibleRows = false;
for (let j = this.itemData.length - 1; j >= 0; --j) {
let id = this.itemData[j].id;
for (let i = 0, length = removeItems.length; i < length; ++i) {
if (id === removeItems[i]) {
if (j < firstVisibleRow) {
this.rowOffset--;
deletedHiddenTopRows = true;
} else if (j >= firstVisibleRow && j < lastVisibleRow) {
deletedVisibleRows = true;
}
this.itemData.splice(j, 1);
break;
}
}
}
// if we deleted both hidden rows in the top buffer above our row offset as well as rows that are currently being
// shown, then we need to adjust the scroll position to compensate unless we are at the bottom of the list
let adjustScrollTop = deletedHiddenTopRows && deletedVisibleRows;
if (this.rowOffset + this.getNumRows() > this.itemData.length) {
this.rowOffset = this.itemData.length - this.getNumRows();
adjustScrollTop = false;
}
this.refresh();
// decrease the last scrolling point to adjust for the amount of row space that was lost from the removed items
let newTopHeight = parseInt(this.elTopBuffer.getAttribute("height"));
let topHeightChange = prevTopHeight - newTopHeight;
this.lastRowChangeScrollTop -= topHeightChange;
if (adjustScrollTop) {
this.elTableScroll.scrollTop -= topHeightChange;
}
this.lastRowShiftScrollTop = 0;
this.refreshBuffers();
this.elTableScroll.scrollTop = 0;
},
clear: function() {
for (let i = 0; i < this.getNumRows(); i++) {
let elRow = this.elTableBody.childNodes[i + FIRST_ROW_INDEX];
this.clearRowFunction(elRow);
elRow.style.display = "none";
elRow.style.display = "none"; // hide cleared rows
}
},
scrollDown: function(numScrollRows) {
let prevTopHeight = parseInt(this.elTopBuffer.getAttribute("height"));
let prevBottomHeight = parseInt(this.elBottomBuffer.getAttribute("height"));
// for each row to scroll down, move the top row element to the bottom of the
// table before the bottom buffer and reset it's row data to the new item
for (let i = 0; i < numScrollRows; i++) {
let rowMovedTopToBottom = this.elTableBody.childNodes[FIRST_ROW_INDEX];
let rowIndex = this.getNumRows() + this.rowOffset;
this.elTableBody.removeChild(rowMovedTopToBottom);
this.elTableBody.insertBefore(rowMovedTopToBottom, this.elBottomBuffer);
this.updateRowFunction(rowMovedTopToBottom, this.itemData[rowIndex]);
this.rowOffset++;
}
// add the row space that was scrolled away to the top buffer height and last scroll point
// remove the row space that was scrolled away from the bottom buffer height
let scrolledSpace = this.rowHeight * numScrollRows;
let newTopHeight = prevTopHeight + scrolledSpace;
let newBottomHeight = prevBottomHeight - scrolledSpace;
this.elTopBuffer.setAttribute("height", newTopHeight);
this.elBottomBuffer.setAttribute("height", newBottomHeight);
this.lastRowChangeScrollTop += scrolledSpace;
},
scrollUp: function(numScrollRows) {
let prevTopHeight = parseInt(this.elTopBuffer.getAttribute("height"));
let prevBottomHeight = parseInt(this.elBottomBuffer.getAttribute("height"));
// for each row to scroll up, move the bottom row element to the top of
// the table before the top row and reset it's row data to the new item
for (let i = 0; i < numScrollRows; i++) {
let topRow = this.elTableBody.childNodes[FIRST_ROW_INDEX];
let rowMovedBottomToTop = this.elTableBody.childNodes[FIRST_ROW_INDEX + this.getNumRows() - 1];
let rowIndex = this.rowOffset - 1;
this.elTableBody.removeChild(rowMovedBottomToTop);
this.elTableBody.insertBefore(rowMovedBottomToTop, topRow);
this.updateRowFunction(rowMovedBottomToTop, this.itemData[rowIndex]);
this.rowOffset--;
}
// remove the row space that was scrolled away from the top buffer height and last scroll point
// add the row space that was scrolled away to the bottom buffer height
let scrolledSpace = this.rowHeight * numScrollRows;
let newTopHeight = prevTopHeight - scrolledSpace;
let newBottomHeight = prevBottomHeight + scrolledSpace;
this.elTopBuffer.setAttribute("height", newTopHeight);
this.elBottomBuffer.setAttribute("height", newBottomHeight);
this.lastRowChangeScrollTop -= scrolledSpace;
},
onScroll: function() {
var that = this.listView;
let scrollTop = that.elTableScroll.scrollTop;
let scrollHeight = that.getScrollHeight();
let nextRowChangeScrollTop = that.lastRowChangeScrollTop + scrollHeight;
let totalItems = that.itemData.length;
let numRows = that.getNumRows();
that.scroll();
},
scroll: function() {
let scrollTop = this.elTableScroll.scrollTop;
let scrollHeight = this.getScrollHeight();
let nextRowChangeScrollTop = this.lastRowShiftScrollTop + scrollHeight;
let totalItems = this.itemData.length;
let numRows = this.getNumRows();
// if the top of the scroll area has past the amount of scroll row space since the last point of scrolling and there
// are still more rows to scroll to then trigger a scroll down by the min of the scroll row space or number of
// remaining rows below
// if the top of the scroll area has gone back above the last point of scrolling then trigger a scroll up by min of
// the scroll row space or number of rows above
if (scrollTop >= nextRowChangeScrollTop && numRows + that.rowOffset < totalItems) {
if (scrollTop >= nextRowChangeScrollTop && numRows + this.rowOffset < totalItems) {
let numScrolls = Math.ceil((scrollTop - nextRowChangeScrollTop) / scrollHeight);
let numScrollRows = numScrolls * SCROLL_ROWS;
if (numScrollRows + that.rowOffset + numRows > totalItems) {
numScrollRows = totalItems - that.rowOffset - numRows;
if (numScrollRows + this.rowOffset + numRows > totalItems) {
numScrollRows = totalItems - this.rowOffset - numRows;
}
that.scrollDown(numScrollRows);
} else if (scrollTop < that.lastRowChangeScrollTop) {
let numScrolls = Math.ceil((that.lastRowChangeScrollTop - scrollTop) / scrollHeight);
this.scrollRows(numScrollRows);
} else if (scrollTop < this.lastRowShiftScrollTop) {
let numScrolls = Math.ceil((this.lastRowShiftScrollTop - scrollTop) / scrollHeight);
let numScrollRows = numScrolls * SCROLL_ROWS;
if (that.rowOffset - numScrollRows < 0) {
numScrollRows = that.rowOffset;
if (this.rowOffset - numScrollRows < 0) {
numScrollRows = this.rowOffset;
}
that.scrollUp(numScrollRows);
this.scrollRows(-numScrollRows);
}
},
scrollRows: function(numScrollRows) {
let numScrollRowsAbsolute = Math.abs(numScrollRows);
if (numScrollRowsAbsolute === 0) {
return;
}
let scrollDown = numScrollRows > 0;
let prevTopHeight = parseInt(this.elTopBuffer.getAttribute("height"));
let prevBottomHeight = parseInt(this.elBottomBuffer.getAttribute("height"));
// if the number of rows to scroll at once is greater than the total visible number of row elements,
// then just advance the rowOffset accordingly and allow the refresh below to update all rows
if (numScrollRowsAbsolute > this.getNumRows()) {
this.rowOffset += numScrollRows;
} else {
// for each row to scroll down, move the top row element to the bottom of the
// table before the bottom buffer and reset it's row data to the new item
// for each row to scroll up, move the bottom row element to the top of
// the table before the top row and reset it's row data to the new item
for (let i = 0; i < numScrollRowsAbsolute; i++) {
let topRow = this.elTableBody.childNodes[FIRST_ROW_INDEX];
let rowToMove = scrollDown ? topRow : this.elTableBody.childNodes[FIRST_ROW_INDEX + this.getNumRows() - 1];
let rowIndex = scrollDown ? this.getNumRows() + this.rowOffset : this.rowOffset - 1;
let moveRowBefore = scrollDown ? this.elBottomBuffer : topRow;
this.elTableBody.removeChild(rowToMove);
this.elTableBody.insertBefore(rowToMove, moveRowBefore);
this.updateRowFunction(rowToMove, this.itemData[rowIndex]);
this.rowOffset += scrollDown ? 1 : -1;
}
}
// add/remove the row space that was scrolled away to the top buffer height and last scroll point
// add/remove the row space that was scrolled away to the bottom buffer height
let scrolledSpace = this.rowHeight * numScrollRows;
let newTopHeight = prevTopHeight + scrolledSpace;
let newBottomHeight = prevBottomHeight - scrolledSpace;
this.elTopBuffer.setAttribute("height", newTopHeight);
this.elBottomBuffer.setAttribute("height", newBottomHeight);
this.lastRowShiftScrollTop += scrolledSpace;
// if scrolling more than the total number of visible rows at once then refresh all row data
if (numScrollRowsAbsolute > this.getNumRows()) {
this.refresh();
}
},
@ -200,9 +161,14 @@ ListView.prototype = {
return;
}
let prevScrollTop = this.elTableScroll.scrollTop;
// start with all row data cleared and initially set to invisible
this.clear();
// if we are at the bottom of the list adjust row offset to make sure all rows stay in view
this.refreshRowOffset();
// update all row data and set rows visible until max visible items reached
for (let i = 0; i < numRows; i++) {
let rowIndex = i + this.rowOffset;
@ -213,16 +179,30 @@ ListView.prototype = {
let elRow = this.elTableBody.childNodes[rowElementIndex];
let itemData = this.itemData[rowIndex];
this.updateRowFunction(elRow, itemData);
elRow.style.display = "";
elRow.style.display = ""; // make sure the row is visible
}
// update the top and bottom buffer heights to adjust for above changes
this.refreshBuffers();
// adjust the last row shift scroll point based on how much the current scroll point changed
let scrollTopDifference = this.elTableScroll.scrollTop - prevScrollTop;
if (scrollTopDifference !== 0) {
this.lastRowShiftScrollTop += scrollTopDifference;
if (this.lastRowShiftScrollTop < 0) {
this.lastRowShiftScrollTop = 0;
}
}
},
refreshBuffers: function() {
// top buffer height is the number of hidden rows above the top row
let topHiddenRows = this.rowOffset;
let topBufferHeight = this.rowHeight * topHiddenRows;
this.elTopBuffer.setAttribute("height", topBufferHeight);
// bottom buffer height is the number of hidden rows below the bottom row (last scroll buffer row)
let bottomHiddenRows = this.itemData.length - numRows - this.rowOffset;
let bottomHiddenRows = this.itemData.length - this.getNumRows() - this.rowOffset;
let bottomBufferHeight = this.rowHeight * bottomHiddenRows;
if (bottomHiddenRows < 0) {
bottomBufferHeight = 0;
@ -230,40 +210,64 @@ ListView.prototype = {
this.elBottomBuffer.setAttribute("height", bottomBufferHeight);
},
resetRows: function(viewableHeight) {
if (!this.elTableBody) {
debugPrint("ListView.resetRows - no valid table body element");
refreshRowOffset: function() {
// make sure the row offset isn't causing visible rows to pass the end of the item list and is clamped to 0
var numRows = this.getNumRows();
if (this.rowOffset + numRows > this.itemData.length) {
this.rowOffset = this.itemData.length - numRows;
}
if (this.rowOffset < 0) {
this.rowOffset = 0;
}
},
onResize: function() {
var that = this.listView;
that.resize();
},
resize: function() {
if (!this.elTableBody || !this.elTableScroll) {
debugPrint("ListView.resize - no valid table body or table scroll element");
return;
}
this.resetRowOffset();
this.elTopBuffer.setAttribute("height", 0);
this.elBottomBuffer.setAttribute("height", 0);
// clear out any existing rows
let prevScrollTop = this.elTableScroll.scrollTop;
// take up available window space
this.elTableScroll.style.height = window.innerHeight - WINDOW_NONVARIABLE_HEIGHT;
let viewableHeight = parseInt(this.elTableScroll.style.height) + 1;
// remove all existing row elements and clear row list
for (let i = 0; i < this.getNumRows(); i++) {
let elRow = elRows[i];
let elRow = this.elRows[i];
this.elTableBody.removeChild(elRow);
}
this.elRows = [];
// create new row elements inserted between the top and bottom buffers that can fit into viewable scroll area
// create new row elements inserted between the top and bottom buffers up until the max viewable scroll area
let usedHeight = 0;
while(usedHeight < viewableHeight) {
let newRow = this.createRowFunction();
this.elTableBody.insertBefore(newRow, this.elBottomBuffer);
this.rowHeight = this.elTableBody.offsetHeight - usedHeight;
usedHeight = this.elTableBody.offsetHeight;
this.rowHeight = newRow.offsetHeight;
usedHeight += this.rowHeight;
this.elRows.push(newRow);
}
// add extras rows for scrolling buffer purposes
// add SCROLL_ROWS extras rows for scrolling buffer purposes
for (let i = 0; i < SCROLL_ROWS; i++) {
let scrollRow = this.createRowFunction();
this.elTableBody.insertBefore(scrollRow, this.elBottomBuffer);
this.elRows.push(scrollRow);
}
this.resizeFunction();
// restore the scroll point to the same scroll point from before above changes
this.elTableScroll.scrollTop = prevScrollTop;
this.refresh();
},
initialize: function() {
@ -285,5 +289,10 @@ ListView.prototype = {
this.elTableScroll.listView = this;
this.elTableScroll.onscroll = this.onScroll;
window.listView = this;
window.onresize = this.onResize;
// initialize all row elements
this.resize();
}
};