Introduction
The DataGridViewFlagColumn
inherits the existing System.Windows.Forms.DataGridViewImageColumn
. It paints the backcolor and chooses the image depending on the value you give the cell. In this code, I use a Flag
enumeration of four possible values:
Public Enum Flag As Integer
Blank = 0
Red = 1
Blue = 2
Yellow = 3
End Enum
If you create more flag icons, you can extend this enumeration. There also is an ErrorIcon
supplied: this icon will be drawn if the value of the cell does not match one of the enumeration values.
The code has two classes: DataGridViewFlagColumn
with just one member:
Public NotInheritable Class DataGridViewFlagColumn
Inherits DataGridViewImageColumn
Public Sub New()
Me.CellTemplate = New DataGridViewFlagCell
...
End Sub
End Class
In the constructor, I assign the CellTemplate
to the second class: DataGridViewFlagCell
, which inherits from System.Windows.Forms.DataGridViewImageCell
. This class has some basic methods and functions: it retrieves the right icon and the right backcolor, and the Paint
method will use them to paint the cells.
This class also provides a different backcolor when the mouse enters/leaves the cell. Have fun!
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