CODEWITHSUNDEEP
actionscript-3apache-flexdatagridflex4.5flex-spark
Anjan
Anjan

Reputation: 1633

Flex 4.5 Spark DataGrid - Detect column clicked in selectionChange handler

I have a spark datagrid with selectionMode="multipleRows".

I have three columns in the datagrid.

I don't want the row selection to happen when the user's click falls on the third column of a row.

The row selection should happen only when one of the first two columns is clicked.

How do I achieve this? There is a selectionChanging event for the datagrid, but the GridSelectionEvent object received in the handler does not seem to provide any information about the column on which the click happened.

Thanks!

Upvotes: 0

Views: 2289

Answers (2)

Fred
Fred

Reputation: 419

I know it's 13 years old, but I have same issue today, here how I done :

protected function dataGrid_itemClickHandler(e:GridSelectionEvent):void             {
            var mouseX:Number = dataGrid.mouseX;
            mouseX += dataGrid.scroller.horizontalScrollBar.value;
            var lastPosX:Number = 0;
            var posX:Number = 0;
            for (var i:int=0; i<dataGrid.columns.length; i++){
                posX += dataGrid.grid.getColumnWidth(i);
                if ((mouseX > lastPosX) && (mouseX< posX)){
                    break;
                }
                lastPosX += dataGrid.grid.getColumnWidth(i);
            }
            //now i is the column index cliqued
            var dc:GridColumn = dataGrid.columns[i];
}

Big hack but it's working

Upvotes: 0

Anjan
Anjan

Reputation: 1633

I figured this out myself. I am not sure if this is a bug in the spark DataGrid. The following is definitely a hack and not clean.

In the grid_mouseDownHandler function in the DataGrid.as file, there is a line:

const columnIndex:int = isCellSelection ? event.columnIndex : -1;

This line is causing the columnIndex to be set as -1 if the selectionMode of the DataGrid is anything other than GridSelectionMode.SINGLE_CELL or GridSelectionMode.MULTIPLE_CELLS. As I mentioned in the original question, I need my datagrid to have a selectionMode of GridSelectionMode.MULTIPLE_ROWS.

I sub-classed the DataGrid and re-implemented the grid_mouseDownHandler (basically copy-pasted the whole function). I changed only the above line to always assign the columnIndex to event.columnIndex.

(I also had to copy some more functions which were referenced by the grid_mouseDownHandler over to my sub-class because those functions were protected or mx_internal. (toggleSelection, extendSelection, isAnchorSet)

Then, in the selectionChanging event handler, I could just do the following:

if( 2 == event.selectionChange.columnIndex )
{
    event.preventDefault();
}

I realize that this is not a clean solution, but it is the best I could think of. Maybe someone can suggest a better solution?

Upvotes: 0

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