Andy De George
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title, ms.date, dev_langs, helpviewer_keywords, ms.assetid
| title | ms.date | dev_langs | helpviewer_keywords | ms.assetid | ||||||
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| How to: Use a Control Rendering Class | 03/30/2017 |
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c0125e34-cd74-4c35-818c-3e40f462b0a3 |
How to: Use a Control Rendering Class
This example demonstrates how to use the xref:System.Windows.Forms.ComboBoxRenderer class to render the drop-down arrow of a combo box control. The example consists of the xref:System.Windows.Forms.Control.OnPaint%2A method of a simple custom control. The xref:System.Windows.Forms.ComboBoxRenderer.IsSupported%2A?displayProperty=nameWithType property is used to determine whether visual styles are enabled in the client area of application windows. If visual styles are active, then the xref:System.Windows.Forms.ComboBoxRenderer.DrawDropDownButton%2A?displayProperty=nameWithType method will render the drop-down arrow with visual styles; otherwise, the xref:System.Windows.Forms.ControlPaint.DrawComboButton%2A?displayProperty=nameWithType method will render the drop-down arrow in the classic Windows style.
Example
[!code-cppSystem.Windows.Forms_ControlRenderer#10] [!code-csharpSystem.Windows.Forms_ControlRenderer#10] [!code-vbSystem.Windows.Forms_ControlRenderer#10]
Compiling the Code
This example requires:
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A custom control derived from the xref:System.Windows.Forms.Control class.
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A xref:System.Windows.Forms.Form that hosts the custom control.
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References to the xref:System?displayProperty=nameWithType, xref:System.Drawing?displayProperty=nameWithType, xref:System.Windows.Forms?displayProperty=nameWithType, and xref:System.Windows.Forms.VisualStyles?displayProperty=nameWithType namespaces.