c1Datagrid DataGridDateTimeColumn input behavior difference

c1Datagrid DataGridDateTimeColumn input behavior difference

Posted by: sebastian-jn.k on 17 December 2021, 3:32 am EST

• 

  sebastian-jn.k

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  Posted 17 December 2021, 3:32 am EST

  assembly name C1.WPF.DataGrid.4.5.2 version 4.5.20212.747

  c1Datagrid c1:DataGridDateTimeColumn keyboard input behavior difference to c1:DataGridTextColumn

  workflow with DataGridTextColumn:

  -one click on Textcolumn
  
  -typing the character ‘2’
  
  result:
  
  the character ‘2’ is immediately inserted

  workflow with DataGridDateTimeColumn:

  -one click on DataGridDateTimeColumn
  
  -typing the character ‘2’
  
  result:
  
  the character ‘2’ is NOT inserted only the edit mode started.

  problem:

  i have to type the 2 again.

  question:

  how do i achieve the same behavior like DataGridTextColumn with the DataGridDateTimeColumn ?

  i tried:

  -catch event previewtextinput on cell
  
  -start cell edit mode to get the edit controls
  
  -resend the previewtextinput character to the C1MaskedTextBox (child?) from the c1DateTimePicker
  
  -but i cannot find the C1MaskedTextBox in the visual tree.

  sample project attachted

  private void DataGridCellPresenter_PreviewTextInput(object sender, TextCompositionEventArgs e)
  
  {
  
  var dgcp = sender as DataGridCellPresenter;
  
  if(dgcp.Cell.Column is DataGridDateTimeColumn)
  
  {
  
  if (!dgcp.Cell.IsEditing)
  
  {
  
  dgcp.DataGrid.BeginEdit(dgcp.Cell);
  
  var editCellPresenter = dgcp.DataGrid.CurrentCell.Presenter as FrameworkElement;
  
  var mtb = FindChild<C1.WPF.C1MaskedTextBox>(editCellPresenter);
  
  //problem here: C1MaskedTextBox is null
  
  if (mtb != null)
  
  {
  
  TextCompositionManager.StartComposition(new TextComposition(InputManager.Current, mtb, e.Text));
  
  }
  
  }
  
  }
  
  }

  greetings from germany

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  sebastian-jn.k

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  Posted 17 December 2021, 6:07 am EST

  sample

  C1DatagridDateTimeProblems.zip

• 

  nitin.sharma

  

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  Posted 20 December 2021, 3:47 am EST

  Hello,

  Thanks for the sample.

  In your case, C1MaskedTextBox is null because C1DateTimePicker isn’t loaded yet. In order to achieve your requirement, you need to wait until C1DateTimePicker load. (see code snippet)

  
  private  async void DataGridCellPresenter_PreviewTextInput(object sender, TextCompositionEventArgs e)
          {
              var dgcp = sender as DataGridCellPresenter;
              if(dgcp.Cell.Column is DataGridDateTimeColumn) 
              {
                  if (!dgcp.Cell.IsEditing)
                  {
                      dgcp.DataGrid.BeginEdit(dgcp.Cell);
                      var editCellPresenter = dgcp.DataGrid.CurrentCell.Presenter as FrameworkElement;
                      await Task.Delay(200);
                      var mtb = FindChild<C1.WPF.C1MaskedTextBox>(editCellPresenter);
                      if (mtb != null)
                      {
                          TextCompositionManager.StartComposition(new TextComposition(InputManager.Current, mtb, e.Text));
                      }
                  }
              }
          }
  
  

  Please refer the attached modified sample for he same : C1DatagridDateTimeProblems_Mod.zip

  Best Regards,
  
  Nitin