TrackBarRenderer.IsSupported Property

 

Gets a value indicating whether the TrackBarRenderer class can be used to draw a track bar with visual styles.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

Public Shared ReadOnly Property IsSupported As Boolean

Property Value

Type: System.Boolean

true if the user has enabled visual styles in the operating system and visual styles are applied to the client area of application windows; otherwise, false.

If this property is false, the methods of this class will throw an InvalidOperationException.

The following code example uses the IsSupported property to determine whether to use the TrackBarRenderer methods. This code example is part of a larger example provided for the TrackBarRenderer class.

' Draw the track bar.
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
    If Not TrackBarRenderer.IsSupported Then
        Me.Parent.Text = "CustomTrackBar Disabled"
        Return
    End If

    Me.Parent.Text = "CustomTrackBar Enabled"
    TrackBarRenderer.DrawHorizontalTrack(e.Graphics, _
        trackRectangle)
    TrackBarRenderer.DrawTopPointingThumb(e.Graphics, _
        thumbRectangle, thumbState)
    TrackBarRenderer.DrawHorizontalTicks(e.Graphics, _
        ticksRectangle, numberTicks, EdgeStyle.Raised)
End Sub

' Determine whether the user has clicked the track bar thumb.
Protected Overrides Sub OnMouseDown(ByVal e As MouseEventArgs)
    If Not TrackBarRenderer.IsSupported Then
        Return
    End If
    If Me.thumbRectangle.Contains(e.Location) Then
        thumbClicked = True
        thumbState = TrackBarThumbState.Pressed
    End If

    Me.Invalidate()
End Sub

.NET Framework
Available since 2.0
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