current cell

[Stefan Tsalapatis]

Hi,
Why you don''t use the event parameter
in QueryCellInfo to pass the information of the CurrentCell ?
ex.
GridQueryCellInfoEventArgs.IsCurrentCell
or GridStyleInfo.IsCurrentCell

Now I must call the
Grid.CurrentCell.HasCurrentCellAt(..)
method every time.
Is not another way ?

Regards

[Administrator]

You can use HasCurrentCellAt or you can check e,RowIndex and e.ColIndex against grid.CurrentCell.RowIndex/ColIndex.

QueryCellInfo is hit very often. Adding the overhead of passing currentcell information which might not be useful for many applications and would come at a performance cost.

[Stefan Tsalapatis]

Another one question.

Inside QueryCellInfo
I set
if ...
Grid[row,col].ReadOnly=true;
When QueryCellInfo reference
to this cell then
e.Style.ReadOnly doesn''t return true

Where is my mistake ?

Thanks

[Administrator]

You set values in QueryCellInfo by setting e.Style.ReadOnly = true.

You do not do it in QueryCellInfo by setting grid[e.RowIndex, e.ColIndex].ReadOnly = true.

[Stefan Tsalapatis]

I need inside QueryCellInfo in a Virtual Grid to change the behavior
of certain cells according to values
of another cells
How to succeed this ?

>You set values in QueryCellInfo by setting e.Style.ReadOnly = true.
>
>You do not do it in QueryCellInfo by setting grid[e.RowIndex, e.ColIndex].ReadOnly = true.

[Stefan Tsalapatis]

even if I set in CurrentCellMoving
of the specific cell for another cell
Grid[Row,Col].ReadOnly or Enabled
then
inside QueryCellInfo the e.style
doesn''t change.
I hope to be my mistake

[Administrator]

>>I need inside QueryCellInfo in a Virtual Grid to change the behavior
of certain cells according to values
of another cells
How to succeed this ?

When e.ColIndex and e.RowIndex point to one of the ''certain cells'', then use grid[e.RowIndex, someColIndex] to retrieve the ''values
of another cells''. Based on this retrieved value, set e.Style.

The idea is that in QueryCellInfo, you provide the proper value of e.Style for the given e.ColIndex and e.RowIndex. If this means getting another value from a different cell and testing it, then you get this value by indexing the grid to retrieve it.

In this manner, you are not ''setting'' a value using grid[row,col].ReadOnly = true. Instead, you are dynamically providing e.Style.ReadOnly when you want the e.ColIndex and e.RowIndex cell to be readonly (doing what ever test you need to do to decide this).

One last comment, is if someColIndex (mentioned above) turns out to be e.ColIndex, then do not try to retrieve the value using an indexer on teh grid. Instead, get it directly from e.Style.CellValue. If you try to use an indexer in this case, you will set up a recursive call into QueryCellInfo.

[Stefan Tsalapatis]

>When e.ColIndex and e.RowIndex point to one of the ''certain cells'', then use grid[e.RowIndex, someColIndex] to retrieve the ''values
>of another cells''. Based on this retrieved value, set e.Style.

One Cell when is modified
influence 10 others . From there is
the normal thing to change the other''s
behavior.
Even in CurrentCellChanged event
I change the Grid[r,c].Readonly
or Enabled.
Later in QueryCellInfo I can not catch
the change.
if( e.style.ReadOnly)
{
never execute
}

So the question is
How dynamically I change the behavior ?

Sorry if I do not understand something
obvious.

>> If you try to use an indexer in this case, you will set up a recursive call into QueryCellInfo.

In QueryCellInfo only if you reference
to the same cell with the GridQueryCellInfoEventArgs

[Administrator]

You are using a GridControl, correct? You cannot set properties on indivdual cells in a GridDataBoundGrid.

Another comment is that if a cell is set (using an indexer) to be readonly, you cannot use an indexer to change the style unless you set grid.IgnoreReadOnly = true first.

Here is a sample using QueryCellInfo that makes cells in col 4 readonly if the cells in col1 and col2 hold numbers, and their sum is greater than 10.

http://www.syncfusion.com/forums/Uploads/GC_QCI_forum.zip

[Stefan Tsalapatis]

Thanks Clay for your sample.

Yes I have understood from your previous post your thought.
To change the dependent cells style into QueryCellInfo
looking for the master cell''s value
and take the appropriate action.
But the needs of analysis are different.
When master cell are changing or even
fetching the value from the datasource,
it lookups to an auxiliary datasource to find the new states. This very moment I have the information to manage the other cells.
If I go with the opposite logic from
the dependent cells to update the states, I must do the lookup inside
QueryCellInfo for every one dependent cell and this has a performance penalty.
Because in this specific case I do not
expect a lot of rows I found a solution to hold a states array for
all rows which is updated when QueryRowCount is raised , or when master cell is changing from the user.

But in general I believe it would be
real useful to be able to change styles from the master cell.

Thanks for your support
Regards

>You are using a GridControl, correct? You cannot set properties on indivdual cells in a GridDataBoundGrid.
>
>Another comment is that if a cell is set (using an indexer) to be readonly, you cannot use an indexer to change the style unless you set grid.IgnoreReadOnly = true first.
>
>Here is a sample using QueryCellInfo that makes cells in col 4 readonly if the cells in col1 and col2 hold numbers, and their sum is greater than 10.
>
>http://www.syncfusion.com/forums/Uploads/GC_QCI_forum.zip

[Administrator]

Are you using a GridControl where the GridControl actually stores the data in its GridData object? (ie., you are not handling SaveCellInfo.)

So, when a master cell changes, you want to explicitly change the styles of several slave cells, correct? If you want to do it this way, why use QueryCellInfo at all? Just always set the style objects in the grid using an indexer when the master cell changes. Then the default QueryCellInfo should retrieve the properly set style object without you having to adjust it.

[Administrator]

No , I don''t store any data .
I handle everything from QueryCellInfo
and SaveCellInfo.
I will open a Direct-Track incident
and I will send you the sample.

[Administrator]

If you are handling all the saving in SaveCellInfo, does your SaveCellInfo save the ReadOnly settings in your datasource? And does your QueryCellInfo set these ReadOnly setting from your datasource?

If not, then setting grid[row, col].ReadOnly will not work.