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How to maintain the focus on filter bar cell while changing the data source?
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Description:
As per the Grid’s internal architecture, when you change the DataSource in a key press event, it makes the Grid reload to ensure the current cell ends its focus. To type continuously in the filter bar cell while the DataSource is changing, there should be workaround as follows.
Solution:
When you want to maintain the focus on the filter bar cell while changing the data source on the key press event, you need to get the location and the text of the filter bar cell by using the TableControlCurrentCellKeyPress event. After changing the data source, you need to move the focus to the same filter bar cell, so that the focus is maintained on the same cell.
C#
//Hooks the event in form load to change the data source
this.gridGroupingControl1.TableControlCurrentCellKeyPress += gridGroupingControl1_TableControlCurrentCellKeyPress;
void gridGroupingControl1_TableControlCurrentCellKeyPress(object sender, GridTableControlKeyPressEventArgs e)
{
//Gets the Current Cell renderer
GridCurrentCell cc = e.TableControl.CurrentCell;
//Checks for the Filter bar renderer
if (cc.Renderer is GridTableFilterBarExtCellRenderer)
{
int rowindex = cc.RowIndex;
int colindex = cc.ColIndex;
string text = cc.Renderer.GetDisplayText();
this.gridGroupingControl1.DataSource = null;
if (text.Length % 2 == 0)
{
this.gridGroupingControl1.DataSource = this.GetTable();
}
else
{
this.gridGroupingControl1.DataSource = this.SetTable();
for (int i = 0; i < this.gridGroupingControl1.TableDescriptor.Columns.Count; i++)
this.gridGroupingControl1.TableDescriptor.Columns[i].AllowFilter = true;
}
//Moves the Focus to the filter bar cell
e.TableControl.CurrentCell.MoveTo(rowindex, colindex, GridSetCurrentCellOptions.SetFocus);
//places the text in the renderer.
cc.Renderer.ControlText = text;
GridOriginalTextBoxControl tb = cc.Renderer.Control as GridOriginalTextBoxControl;
if (tb != null)
{
//Moves the cursor position to the end of the text.
tb.SelectionStart = tb.TextLength;
tb.SelectionLength = 0;
}
}
}
VB
'Hooks the event in form load to change the data source Private Me.gridGroupingControl1.TableControlCurrentCellKeyPress += AddressOf gridGroupingControl1_TableControlCurrentCellKeyPress Private Sub gridGroupingControl1_TableControlCurrentCellKeyPress(ByVal sender As Object, ByVal e As GridTableControlKeyPressEventArgs) 'Gets the Current Cell renderer Dim cc As GridCurrentCell = e.TableControl.CurrentCell 'Checks for the Filter bar renderer If TypeOf cc.Renderer Is GridTableFilterBarExtCellRenderer Then Dim rowindex As Integer = cc.RowIndex Dim colindex As Integer = cc.ColIndex Dim text As String = cc.Renderer.GetDisplayText() Me.gridGroupingControl1.DataSource = Nothing If text.Length Mod 2 = 0 Then Me.gridGroupingControl1.DataSource = Me.GetTable() Else Me.gridGroupingControl1.DataSource = Me.SetTable() For i As Integer = 0 To Me.gridGroupingControl1.TableDescriptor.Columns.Count - 1 Me.gridGroupingControl1.TableDescriptor.Columns(i).AllowFilter = True Next i End If 'Moves the Focus to the filter bar cell e.TableControl.CurrentCell.MoveTo(rowindex, colindex, GridSetCurrentCellOptions.SetFocus) 'places the text in the renderer. cc.Renderer.ControlText = text Dim tb As GridOriginalTextBoxControl = TryCast(cc.Renderer.Control, GridOriginalTextBoxControl) If tb IsNot Nothing Then 'Moves the cursor position to the end of the text. tb.SelectionStart = tb.TextLength tb.SelectionLength = 0 End If End If End Sub
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