VB3 How to Edit Grid Cells in VB Using Overlapped Text Box
Last reviewed: May 21, 1998
Article ID: Q85109


3.00 WINDOWS
This information in this article applies to:
- Microsoft Visual Basic programming system for Windows, version 3.0

SUMMARY
The Grid custom control does not provide any text editing capability. The
example program below shows how you can use a text box to perform text
editing in the current cell of a grid.

MORE INFORMATION
The example program shown below enables you to edit the contents of a grid
cell. When you press a key, the grid moves a text box to the position of the
current cell and sets the focus to the text box. When you press the ENTER
key or change focus away from the current cell, the program transfers the
text in the text box back to the grid.

Steps to Create Example Program
Start Visual Basic or from the File menu, choose New Project (ALT, F, N) if
Visual Basic is already running. Form1 is created by default.
>From the File menu, choose Add File. Then select the GRID.VBX file. The Grid
tool appears in the Toolbox.
Place a grid (Grid1) and a text box (Text1) on Form1. Set the Grid1 Cols and
Rows properties both to 4. Then size the grid to show all the cells. Set the
Text1 BorderStyle property to None (0) and the Visible property to False
(0).
Enter the following declarations in the general Declarations section:
   Const ASC_ENTER = 13 ' ASCII code of ENTER key.
   Dim gRow As Integer
   Dim gCol As Integer

Enter the following code in the Grid1_KeyPress procedure:
   Sub Grid1_KeyPress (KeyAscii As Integer)
      ' Move the text box to the current grid cell:
      Call grid_text_move(Grid1, Text1)
      ' Save the position of the grids Row and Col for later:
      gRow = Grid1.Row
      gCol = Grid1.Col
      ' Make text box same size as current grid cell:
      Text1.Width = Grid1.ColWidth(Grid1.Col) - 2 * Screen.TwipsPerPixelX
      Text1.Height = Grid1.RowHeight(Grid1.Row) - 2 * Screen.TwipsPerPixelY
      ' Transfer the grid cell text:
      Text1.Text = Grid1.Text
      ' Show the text box:
      Text1.Visible = True
      Text1.ZOrder 0
      Text1.SetFocus
      ' Redirect this KeyPress event to the text box:
      If KeyAscii <> ASC_ENTER Then
         SendKeys Chr$(KeyAscii)
      End If
   End Sub

Add the following code to the Text1_KeyPress procedure:
   Sub Text1_KeyPress (KeyAscii As Integer)
      If KeyAscii = ASC_ENTER Then
         Grid1.SetFocus ' Set focus back to grid, see Text_LostFocus.
         KeyAscii = 0 ' Ignore this KeyPress.
      End If
   End Sub

Add the following code to the Text1_LostFocus procedure:
   Sub Text1_LostFocus ()
      Dim tmpRow As Integer
      Dim tmpCol As Integer
      ' Save current settings of Grid Row and col. This is needed only if
      ' the focus is set somewhere else in the Grid.
      tmpRow = Grid1.Row
      tmpCol = Grid1.Col
      ' Set Row and Col back to what they were before Text1_LostFocus:
      Grid1.Row = gRow
      Grid1.Col = gCol
      Grid1.Text = Text1.Text ' Transfer text back to grid.
      Text1.SelStart = 0 ' Return caret to beginning.
      Text1.Visible = False ' Disable text box.
      ' Return row and Col contents:
      Grid1.Row = tmpRow
      Grid1.Col = tmpCol
   End Sub

In the general Declarations section or in a separate .BAS file, add the
following Sub routine:
   Sub grid_text_move (Grid As Control, TextBox As Control)
      ' Move a text box to the position of the current cell in a grid:
      Dim X As Single ' x position of current grid cell.
      Dim Y As Single ' y position of current grid cell.
      Dim i As Integer ' Column/row index.
      ' Skip grid border:
      X = Grid.Left
      Y = Grid.Top
      If Grid.BorderStyle = 1 Then
         X = X + Screen.TwipsPerPixelX
         Y = Y + Screen.TwipsPerPixelY
      End If
      ' Skip fixed columns and rows:
      For i = 0 To Grid.FixedCols - 1
         X = X + Grid.ColWidth(i)
         If Grid.GridLines Then
            X = X + Screen.TwipsPerPixelX
         End If
      Next
      For i = 0 To Grid.FixedRows - 1
         Y = Y + Grid.RowHeight(i)
         If Grid.GridLines Then
            Y = Y + Screen.TwipsPerPixelY
         End If
      Next
      ' Find current data cell:
      For i = Grid.LeftCol To Grid.Col - 1
          X = X + Grid.ColWidth(i)
          If Grid.GridLines Then
              X = X + Screen.TwipsPerPixelX
          End If
      Next
      For i = Grid.TopRow To Grid.Row - 1
          Y = Y + Grid.RowHeight(i)
          If Grid.GridLines Then
              Y = Y + Screen.TwipsPerPixelY
          End If
      Next
      ' Move the Text Box, and make small adjustments:
      TextBox.Move X + Screen.TwipsPerPixelX, Y + Screen.TwipsPerPixelY
   End Sub

Press the F5 key to run the program. Press a key to begin entering text into
a cell. Type in some text. Press the ENTER key to finish editing the cell.
Use the arrow keys to move to another cell. You can press the ENTER key to
begin editing a cell without changing the contents of the cell.










----------------------------------------------------------------------------
----
Additional reference words: 3.00
KBCategory:
KBSubcategory: PrgCtrlsStd
Keywords : PrgCtrlsStd kbcode
Version : 3.00
Platform : WINDOWS