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How to specify a gradient or other brush for the GroupBar's GroupBarItem background

Platform: WinForms |
Control: GroupBar |
Published Date: April 30, 2011 |
Last Revised Date: July 10, 2014

 

The GroupBar control permits programmatic assignment of any System.Drawing.Brush derived class for drawing the GroupBarItem background region through the GroupBarItem.BackgroundBrush property.

The following code excerpt demonstrates creating and assigning a GradientBrush for one of the GroupBarItem objects.

C#

// Set up the Blend for the GradientBrush

Blend blend = new Blend();

blend.Factors = new float[] {0.0f, 0.0f, 1.0f};

blend.Positions = new float[] {0.0F, 0.5f, 1.0F};

// Estimate the GroupBarItem bounds

Rectangle rcgroupbaritem = new Rectangle(0, 0, this.groupBar1.Width, this.groupBar1.GroupBarItemHeight);

// Create and initialize the LinearGradientBrush

LinearGradientBrush lgbrush = new LinearGradientBrush(rcgroupbaritem, Color.White, Color.Red, 0, true);

lgbrush.Blend = blend;

// Assign the gradientbrush to the GroupBarItem1 of GroupBar1

this.groupBarItem1.BackgroundBrush = lgbrush;

VB

' Set up the Blend for the GradientBrush

blend As Blend = New Blend()

blend.Factors = New Single() {0.0f, 0.0f, 1.0f}

blend.Positions = New Single() {0.0F, 0.5f, 1.0F}

' Estimate the GroupBarItem bounds

rcgroupbaritem As Rectangle = New Rectangle(0, 0, Me.groupBar1.Width, Me.groupBar1.GroupBarItemHeight)

' Create and initialize the LinearGradientBrush

lgbrush As LinearGradientBrush = New LinearGradientBrush(rcgroupbaritem, Color.White, Color.Red, 0, True)

lgbrush.Blend = blend

' Assign the gradientbrush to the GroupBarItem1 of GroupBar1

Me.groupBarItem1.BackgroundBrush = lgbrush

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