how to capture event when moving from one cell to another in same row.
You get the CurrentCellChanged event:
[...] when the value of the CurrentCell property has changed.
You'd have to check you were still on the same row, but it should do what you want.
Related
I have a datagrid with data bound with an Observable collection of objects which implement InotifyChanged. When i select an item in the data grid, the selection unit should be the entire row (not cell by cell). However, when i update a cell and navigates to the other cell using the "tab" key, the change on the previous cell should be saved (or the PropertyChangedEvents should be triggered). Is there a way to achieve this?
Additional notes:
I've tried with UpdateSourceTrigger=LostFocus and this works fine. But once the change is saved, the current cell is not highlighted (editable). I had to click on the cell again using the mouse to get the focus.
I tried to use the SelectionCellsChanged event but this is not triggered while navigating through cells when the selectionMode is row
I have a DataGridView and I should handle an event when a row (or any cell of a row) is clicked, yet I can't find anything like this. Is there a way to do this other than having each individual cell a handler method?
You may try the SelectionChanged event of Datagridview.
You have to set the SelectionMode property to FullRowSelect and check any change in the above event.
If necessary, you can get the rowindex using Datagridview.CurrentCell.Rowindex too.
I need to execute some logic if and only if the value of a particular cell changes AND the focus has shifted to another cell. The logic needs to be executed only if both a value has changed and the focus has changed...i.e. the user has finished editing a cell and is moving on. It should not go off just by changing the cell focus...only if the value was changed. I've been searching for and experimenting with events and have been unsuccessful so far.
Please note...this is an unbound grid view that is populated programmatically. I would have loved to have used a conventional bound grid view but this is what I have to use because of how our existing code is written.
This is what I have tried...
DataGridView.CellValidated
"Occurs after the cell has finished validating."
This fires when I change a cell value...and then afterwards every time I change cell focus regardless of if I actually change a cell value after the first time. Does not fit my needs because it keeps getting called whenever I move focus...even if there was not change in value.
DataGridView.CellValidating
"Occurs when a cell loses input focus, enabling content validation."
Does not seem to do what I need either.
DataGridView.CellValueChanged
"Occurs when the value of a cell changes."
This fires every time I change the value...before shifting focus. Not useful either for my purposes.
I really don't know if I am using the right event and or not setting a property somewhere or not calling a certain method to change the state of the grid view. Help would be appreciated.
Thanks,
John
Use the Cellvalidating event to check if the value has changed or not put it on globale Boolean and save the current cell row index and column, and on the SelectionChanged event check if the value change : if it hasn't change use DatagridCurrentCell to put the focus on the save index row and column saved
datagridview_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
{
if(e.FormattedValue == (theOldValue))
{
changed = false;
currentIndexRow= e.RowIndex;
currentIndexColumn= e.ColumnIndex;
e.cancel = true;
}
}
datagridview_SelectionChanged(object sender, EventArgs e)
{
if(!changed)
datagridview.CurrentCell = datagridview.Rows[currentIndexRow].Cells[currentIndexColumn];
}
Use a combination of events;
When a CellValueChanged event is fired, set a flag indicating that the value changed.
Then when the CellLeave event is fired, check the flag and execute your logic accordingly..
How I can get row and column clicked in MouseUp event?
You should be able to use the VisualTreeHelper.GetParent method to recursively search for the DataGridCell that contains the source of the MouseUp event.
From there you can get the column and row
When I change a value programatically in a DataTable that my DataGridView is bound to, the appropriate CellValueChanged event is not firing for the DataGridView. I'm trying to change a cell's background color based on cell value when the DataTable is filled with data without iterating through every row and checking each value.
You are changing the DataTable directly and expect DataGridView's event to be fired?
I suggest that you change the cell value programatically as:
DataGridView[ColumnIndex, RowIndex].Value = NewValue;
Additionally you will have to Call DataGridView.CommitEdit() to commit the values to the DataTable. This should trigger the CellValueChanged event.
http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.cellvaluechanged.aspx
Changing the cells background color should be done in the RowPrePaint-Event, this will be fired if the row is repainted, after the value change.