Saturday, May 21, 2022

Formatting Grids Dynamically

I've been working with grids a lot lately, and find setting them up very tedious: set ColumnCount to the desired value, set ControlSource and other properties such as InputMask and Alignment for every column, set Caption and other properties for every header, etc. To make matters worse, if you change the RecordSource for the grid, ControlSource gets reset for every column so now you have to go back and fix them. To matters even worse, if you need to add a new column between two existing ones, you have to move all the property settings for the subsequent columns. (Yes, I know you can just increment ColumnCount and set ColumnOrder for the new column to the proper value, but then the visual appearance of the grid doesn't match the column order in the Properties window. Do that a couple of times and then have fun trying to find a specific column.)

So, I decided to format grids programmatically. At first, I wrote a lot of code like this:

with This.grdOrders
   .ColumnCount  = 22
   .RecordSource = 'orders'

   .Column1.ControlSource   = 'orders.line'
   .Column1.Width           = 30
   .Column1.Header1.Caption = 'Line'

   .Column2.ControlSource   = 'sorder.item'
   .Column2.Width           = 40
   .Column2.Header1.Caption = 'Item #'

   * more code here for the rest of the columns

That too grew tedious quickly. So, I decided to dynamically format the grid at run time rather than design time. I added a SetupColumns method to my grid base class with code that accepts a format string and applies it to the grid. Then in an instance of the grid, I write code that sets up the format string and calls SetupColumns. Here's an example:

text to lcColumns noshow
Field		|Width	|Caption	|Alignment	|InputMask	|ReadOnly	|Control
Invnum		|70	|Invoice #	|		|		|.T.		|
Date		|70	|Date		|		|		|.T.		|
Name		|*	|Project	|		|		|.T.		|
Amount		|60	|Amount		|1		|99,999.99	|.T.		|
Hours		|40	|Hours		|1		|999.99		|.T.		|
Paid		|70	|Date Paid	|		|		|		|Checkbox
Received	|60	|Received	|1		|99,999.99	|		|

Here are some rules for the format string:

  • The format settings must be in this order and have a header row like shown above
  • Separate format settings with tabs and a pipe
  • "Field" is the field name (aliased or not)
  • Use a tab for an unspecified value, such as Alignment and InputMask for most of the entries in the example
  • Use "*" for Width to "auto-size" a column; that is, size it to the rest of the space after the other columns are sized
  • Control specifies what control to use for the column. Currently only Checkbox is supported but others could easily be added

Now setting up a grid is just a matter of filling out an easy-to-understand "table" of column settings. Need to add a new column in the middle of the grid? Just add a new line to the table.

However, it's still slightly tedious because you have to run the form the grid is on to see what it looks like, close the form, edit the table (adjust column widths and alignment, for example), run the form again, rinse and repeat. So, I created a builder named SFGridBuilder that does the same thing at design time. Select the format string without the "text" and "endtext" statements, copy it, invoke the builder, and ta da, the grid is formatted at design time. Tweak the string, copy it, run the builder again ... repeat until perfect. This builder works with any grid, even a VFP base class.

How do you invoke the builder? Any way you normally would:

  • I added a Builder property to my grid base class and set it to SFGridBuilder.prg
  • You can register it with Thor and invoke it through a Thor hot key or menu
  • You can register it with
  • You can run it directly: do (path + 'SFGridBuilder')
Rick Schummer did a session at Virtual Fox Fest 2020 about builders, so watch the video for details.

Monday, May 09, 2022

Virtual Fox Fest 2022 (May) Follow-up

Here are some follow-up notes about Virtual Fox Fest 2022 (May):

  • Videos for all presentations are now available on YouTube for free to everyone, as our contribution to the VFP community. Be sure to subscribe to our channel.
  • If you didn't attend Virtual Fox Fest and want materials (white papers and sample code) for the presentations, go to and "register" for the conference. You're not really registering since it's over, but in the Registration Fees section of the registration page, you'll see "Virtual Fox Fest Session Materials" for previous events. There's also an opportunity to sponsor Virtual Fox Fest, which means your name will be listed on our Sponsors page.
  • If you didn't attend Virtual Fox Fest, check out our Facebook page and see what you missed, then plan to attend a future one so you can join in the fun.

Virtual Fox Fest 2022 (October): Call for Speakers

We're excited to offer you Virtual Fox Fest 2022 (October), a three-day online conference presenting the latest in Microsoft Visual FoxPro development techniques and interoperability with other technologies. This conference provides a venue for VFP developers to come together virtually to learn more about how our fellow developers are using and extending VFP. For details about Virtual Fox Fest, please see

The conference is going to be on October 13th, 19th, and 25th, 2022. 

We've issued the Call for Speakers for Virtual Fox Fest. If you are interested in presenting, please read the document referenced at and consider submitting sessions.