How the Paint Event of a Form Works

MORE INFORMATION

Example

1. Create a form and add a new property for the form. On the Form menu, click New Property, and in the Name box, type:

   numcount

   In the Properties sheet under the Other tab, scroll to the bottom, and change the .F. beside the numcount property to the numeric value of 1.
2. Add a text box to the form.
3. In the Paint event of the form, add the following code:

      THISFORM.NUMCOUNT = THISFORM.NUMCOUNT + 1
      THISFORM.TEXT1.VALUE = STR(THISFORM.NUMCOUNT)
   						

4. Run the form. Note that the text box is being regularly updated with a new number. This is because the Paint event is being called repeatedly. Every time the value of the text box is changed in Paint event, the Paint event is called again because it sees that the value of an object in the form has changed.