BackColor, ForeColor Properties

Artikel
10/23/2006

Specifies the background or foreground color used to display text and graphics in an object. Available at design time and run time.

Object.BackColor[ = nColor]
Object.ForeColor[ = nColor]

Property Values

nColor
Specifies a single color value.

The following table lists typical color values.

Color	RGB Values	nColor Value
White	255, 255, 255	16777215
Black	0, 0, 0	0
Gray	192, 192, 192	12632256
Dark gray	128, 128, 128	8421504
Red	255, 0, 0	255
Dark red	128, 0, 0	128
Yellow	255, 255, 0	65535
Dark yellow	128, 128, 0	32896
Green	0, 255, 0	65280
Dark green	0, 128, 0	32768
Cyan	0, 255, 255	16776960
Dark cyan	0, 128, 128	8421376
Blue	0, 0, 255	16711680
Dark blue	0, 0, 128	8388608
Magenta	255, 0 ,255	16711935
Dark magenta	128, 0, 128	8388736

If nColor is a negative value, Visual FoxPro uses the integer and ignores any rollover issues. For example, -1 is the equivalent of 0xFFFFFFFF.

Remarks

Visual FoxPro uses a red-green-blue (RGB) color scheme for colors. The red, green, and blue components are each represented by a number between 0 and 255. Use the RGB( ) function to convert the three component colors into one composite nColor.

Note The BackColor property does not apply to the CommandButton control. The ForeColor property does not apply to the CommandGroup, OptionGroup, or Shape controls.

Example

The following example demonstrates how the Shape control can be used to display a circle, ellipse, or square on a form, and how the BackColor property can be used to specify the color of each shape.

A form is created, and a set of option buttons and a command button are placed on the form. When you choose one of the option buttons, the corresponding shape is displayed on the form. The BackColor property is used to specify the color of each shape. The Height, Width, and Curvature properties of each shape determine the type of shape created.

frmMyForm = CREATEOBJECT('Form')  && Create a Form
frmMyForm.Closable = .F.  && Disable the Control menu box 

frmMyForm.AddObject('cmdCommand1','cmdMyCmndBtn')  && Add Command button
frmMyForm.AddObject('opgOptionGroup1','opgMyOptGrp') && Add Option Group
frmMyForm.AddObject('shpCircle1','shpMyCircle')  && Add Circle Shape
frmMyForm.AddObject('shpEllipse1','shpMyEllipse')  && Add Ellipse Shape
frmMyForm.AddObject('shpSquare','shpMySquare')  && Add Box Shape

frmMyForm.cmdCommand1.Visible =.T.  && "Quit" Command button visible

frmMyForm.opgOptionGroup1.Buttons(1).Caption = "\<Circle"
frmMyForm.opgOptionGroup1.Buttons(2).Caption = "\<Ellipse"
frmMyForm.opgOptionGroup1.Buttons(3).Caption = "\<Square"
frmMyForm.opgOptionGroup1.SetAll("Width", 100) && Set Option group width
frmMyForm.opgOptionGroup1.Visible = .T.  && Option Group visible
frmMyForm.opgOptionGroup1.Click  && Show the circle

frmMyForm.SHOW  && Display the form
READ EVENTS  && Start event processing

DEFINE CLASS opgMyOptGrp AS OptionGroup  && Create an Option Group
   ButtonCount = 3  && Three Option buttons
   Top = 10
   Left = 10
   Height = 75
   Width = 100

   PROCEDURE Click 
      ThisForm.shpCircle1.Visible = .F.  && Hide the circle
      ThisForm.shpEllipse1.Visible = .F.  && Hide the ellipse
      ThisForm.shpSquare.Visible = .F.  && Hide the square
      
      DO CASE
         CASE ThisForm.opgOptionGroup1.Value = 1
            ThisForm.shpCircle1.Visible = .T. && Show the circle
         CASE ThisForm.opgOptionGroup1.Value = 2 
            ThisForm.shpEllipse1.Visible = .T.  && Show the ellipse
         CASE ThisForm.opgOptionGroup1.Value = 3 
            ThisForm.shpSquare.Visible = .T.  && Show the square
      ENDCASE
ENDDEFINE

DEFINE CLASS cmdMyCmndBtn AS CommandButton  && Create Command button
   Caption = '\<Quit'  && Caption on the Command button
   Cancel = .T.  && Default Cancel Command button (Esc)
   Left = 125  && Command button column
   Top = 210  && Command button row
   Height = 25  && Command button height

   PROCEDURE Click
      CLEAR EVENTS  && Stop event processing, close Form
ENDDEFINE

DEFINE CLASS shpMyCircle AS SHAPE  && Create a circle
   Top = 10
   Left = 200
   Width = 100
   Height = 100
   Curvature = 99
   BackColor = RGB(255,0,0)  && Red
ENDDEFINE

DEFINE CLASS shpMyEllipse AS SHAPE  && Create an ellipse
   Top = 35
   Left = 200
   Width = 100
   Height = 50
   Curvature = 99
   BackColor = RGB(0,128,0)  && Green
ENDDEFINE

DEFINE CLASS shpMySquare AS SHAPE  && Create a square
   Top = 10
   Left = 200
   Width = 100
   Height = 100
   Curvature = 0
   BackColor = RGB(0,0,255)  && Blue
ENDDEFINE

Freigeben über

BackColor, ForeColor Properties

Property Values

Remarks

Example

See Also

Zusätzliche Ressourcen