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const nsIDOMKeyEvent = Components.interfaces.nsIDOMKeyEvent;
/**
* Create grid object based on HTML table.
*/
function grid(aTableIdentifier)
{
this.getRowCount = function getRowCount()
{
return this.table.rows.length - (this.table.tHead ? 1 : 0);
}
this.getColsCount = function getColsCount()
{
return this.table.rows[0].cells.length;
}
this.getRowAtIndex = function getRowAtIndex(aIndex)
{
return this.table.rows[this.table.tHead ? aIndex + 1 : aIndex];
}
this.getMaxIndex = function getMaxIndex()
{
return this.getRowCount() * this.getColsCount() - 1;
}
this.getCellAtIndex = function getCellAtIndex(aIndex)
{
var rowCount = this.getRowCount();
var colsCount = this.getColsCount();
var rowIdx = Math.floor(aIndex / colsCount);
var colIdx = aIndex % colsCount;
var row = this.getRowAtIndex(rowIdx);
return row.cells[colIdx];
}
this.getIndexByCell = function getIndexByCell(aCell)
{
var colIdx = aCell.cellIndex;
var rowIdx = aCell.parentNode.rowIndex;
if (this.table.tHead)
rowIdx -= 1;
var colsCount = this.getColsCount();
return rowIdx * colsCount + colIdx;
}
this.getCurrentCell = function getCurrentCell()
{
var rowCount = this.table.rows.length;
var colsCount = this.getColsCount();
for (var rowIdx = 0; rowIdx < rowCount; rowIdx++) {
for (var colIdx = 0; colIdx < colsCount; colIdx++) {
var cell = this.table.rows[rowIdx].cells[colIdx];
if (cell.hasAttribute("tabindex"))
return cell;
}
}
return null;
}
this.initGrid = function initGrid()
{
this.table.addEventListener("keypress", this, false);
this.table.addEventListener("click", this, false);
}
this.handleEvent = function handleEvent(aEvent)
{
if (aEvent instanceof nsIDOMKeyEvent)
this.handleKeyEvent(aEvent);
else
this.handleClickEvent(aEvent);
}
this.handleKeyEvent = function handleKeyEvent(aEvent)
{
if (aEvent.target.localName != "td")
return;
var cell = aEvent.target;
switch(aEvent.keyCode) {
case nsIDOMKeyEvent.DOM_VK_UP:
var colsCount = this.getColsCount();
var idx = this.getIndexByCell(cell);
var upidx = idx - colsCount;
if (upidx >= 0) {
cell.removeAttribute("tabindex");
var upcell = this.getCellAtIndex(upidx);
upcell.setAttribute("tabindex", "0");
upcell.focus();
}
break;
case nsIDOMKeyEvent.DOM_VK_DOWN:
var colsCount = this.getColsCount();
var idx = this.getIndexByCell(cell);
var downidx = idx + colsCount;
if (downidx <= this.getMaxIndex()) {
cell.removeAttribute("tabindex");
var downcell = this.getCellAtIndex(downidx);
downcell.setAttribute("tabindex", "0");
downcell.focus();
}
break;
case nsIDOMKeyEvent.DOM_VK_LEFT:
var idx = this.getIndexByCell(cell);
if (idx > 0) {
cell.removeAttribute("tabindex");
var prevcell = this.getCellAtIndex(idx - 1);
prevcell.setAttribute("tabindex", "0");
prevcell.focus();
}
break;
case nsIDOMKeyEvent.DOM_VK_RIGHT:
var idx = this.getIndexByCell(cell);
if (idx < this.getMaxIndex()) {
cell.removeAttribute("tabindex");
var nextcell = this.getCellAtIndex(idx + 1);
nextcell.setAttribute("tabindex", "0");
nextcell.focus();
}
break;
}
}
this.handleClickEvent = function handleClickEvent(aEvent)
{
if (aEvent.target.localName != "td")
return;
var curCell = this.getCurrentCell();
var cell = aEvent.target;
if (cell != curCell) {
curCell.removeAttribute("tabindex");
cell.setAttribute("tabindex", "0");
cell.focus();
}
}
this.table = getNode(aTableIdentifier);
this.initGrid();
}
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