How to Set the Color and Font of Grid Rows Conditionally

• Microsoft Visual FoxPro for Windows, version 3.0

SUMMARY

Visual FoxPro provides several dynamic properties that allow control over the appearance of information contained in grid columns. These properties are collectively referred to as dynamic properties.

This article shows by example how to use a combination of the dynamic properties, the SETALL method, and an IIF statement to change the color or font of entire rows in the grid that meet a predetermined condition.

The dynamic properties include:

   DynamicForeColor
   DynamicBackColor
   DynamicFontName
   DynamicFontSize
   DynamicFontBold
   DynamicFontItalic
   DynamicFontStrikethru
   DynamicUnderline
   DynamicAlignment
   DynamicCurrentControl

MORE INFORMATION

The following program creates a form and places a grid on it. The grid object displays information from the Customer table in the Tastrade database. For only those customers from Washington, the code displays all of the columns with blue text.

Code Sample

** Begin code example

OPEN DATABASE c:\vfp\samples\mainsamp\data\tastrade

#include FOXPRO.h        && used for color constants.
PUBLIC otheForm          && keep form live after the program is done
otheForm = CREATEOBJECT("theForm")      && make the form
otheForm.SHOW                 && show the form

   SCALEMODE = 0
   ADD OBJECT "testgrid" AS mygrid   && add the grid to the form

   PROCEDURE INIT
      THISFORM.CAPTION = "Grid with conditional color in rows"
      THISFORM.WIDTH = 100
      THISFORM.BACKCOLOR = RGB(192,192,192)
   ENDPROC

   PROCEDURE DESTROY
      SET DATABASE TO tastrade
      CLOSE DATA
      RELEASE thisform
   ENDPROC

DEFINE CLASS mygrid AS GRID      && class definition for the grid
   COLUMNCOUNT= 3
   SCROLLBARS = 3
   RECORDSOURCETYPE = 0        && alias
   RECORDSOURCE = "Customer"
   WIDTH = 83
   TOP = 1
   LEFT = 7
   PROCEDURE INIT              && use the init procedure to set
                               && appropriate column properties
      WITH THIS.column1
         .header1.CAPTION = "Customer ID"
         .WIDTH = 15
         .CONTROLSOURCE = "customer.customer_id"
      ENDWITH

      WITH THIS.column2
         .header1.CAPTION = "Company Name"
         .WIDTH = 25
         .CONTROLSOURCE = "customer.company_name"
      ENDWITH
      WITH THIS.column3
         .WIDTH = 10
         .header1.CAPTION = "Region"
         .CONTROLSOURCE = "customer.region"
      ENDWITH

   ** The following two lines of code determine the conditional
   ** row color for the grid:

      foreexpr = 'IIF(ALLTRIM(customer.region) == "WA",' + ;
         LTRIM(STR(COLOR_BLUE)) + ',' + LTRIM(STR(COLOR_BLACK)) +')'
      THIS.SETALL("DynamicForeColor",foreexpr,"Column")
   ENDPROC

** End code example