TrackBarRenderer.DrawHorizontalTrack Method (Graphics, Rectangle)

 

Draws the track for a horizontal track bar with visual styles.

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

Public Shared Sub DrawHorizontalTrack (
	g As Graphics,
	bounds As Rectangle
)

Parameters

g
Type: System.Drawing.Graphics

The Graphics used to draw the track.

bounds
Type: System.Drawing.Rectangle

The Rectangle that specifies the bounds of the track.

Exception Condition
InvalidOperationException

The operating system does not support visual styles.

-or-

Visual styles are disabled by the user in the operating system.

-or-

Visual styles are not applied to the client area of application windows.

Before calling this method, you should verify that the value of the IsSupported property is true.

The following code example uses the DrawHorizontalTrack method in a custom control's OnPaint method to draw a track bar. 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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