DataGridView pencil and row editing

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imran.a - 26 Jul 2007 09:36 GMT

Hi,
The datagridview control is rather confusing when it comes to editing rows.
I have a datagridview control bound to a dataset (exposed through a
bindingsource). The edit mode is set to edit on key stroke. The problem is
that when you begin editing a cell for a given row the pencil glyph will
appear in the row header. If you move in to the next cell for the same row
(tab or right arrow key for example) it would appear that you are no longer
in edit mode as the pencil disappears and an arrow is shown in the
corresponding row header. However, although you are no longer editing a cell
the row remains in 'edit mode' (i.e the underlying data set row has pending
proposed changes).

This is very confusing for users especially with large datasets as it is
very easy to edit a cell and then attempt to save your changes only to find
that they were not committed. Off course if you remember to hit enter every
time you edit a cell you can be sure that each change is committed to the
dataset however, there are no visual cues which indicate to the user that the
current row is dirty.

Is there any way I can show the pencil glyph in the row header as long as
the current row is being edited? I cant seem to find any useful row events to
hook in to (the cell has begin and endedit but there is nothing similar for
rows) to achieve this.

Thanks in advance.

Imran

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ClayB - 28 Jul 2007 09:45 GMT

You can draw it your self. Handle CellBeginEdit to set a flag when the
row starts editing. Test this flag in CellPainting and draw the icon
when needed. Then reset the flag in CurrentCellChanged when you move
off the row.

private int editingRowIndex = int.MinValue;
void dataGridView1_CellBeginEdit(object sender,
DataGridViewCellCancelEventArgs e)
{
editingRowIndex = e.RowIndex;
}
void dataGridView1_CurrentCellChanged(object sender, EventArgs
e)
{
if (dataGridView1.CurrentCell.RowIndex != editingRowIndex)
{
editingRowIndex = int.MinValue;
}
}
void dataGridView1_CellPainting(object sender,
DataGridViewCellPaintingEventArgs e)
{
if (e.ColumnIndex == -1 && e.RowIndex == editingRowIndex)
{ //drawing row header
e.Paint(e.ClipBounds, DataGridViewPaintParts.All);
Rectangle rect = e.CellBounds;
rect.X += 4;//move in a little
rect.Width = 16;
e.Graphics.DrawIcon(pencilIcon, rect);
e.Handled = true;
}
}

=====================
Clay Burch
Syncfusion, Inc.

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imran.a - 30 Jul 2007 20:04 GMT

Thanks Clay I will try this out. Any idea where I can find the pencil icon or
will I have to add my own icon file.

Thanks,

Imran

> You can draw it your self. Handle CellBeginEdit to set a flag when the
> row starts editing. Test this flag in CellPainting and draw the icon
[quoted text clipped - 32 lines]
> Clay Burch
> Syncfusion, Inc.

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DataGridView pencil and row editing

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