The ODForm sample demonstrates how to use owner-drawn controls in Visual C# .NET or in Visual C# 2005. The .NET Framework provides support for features such as owner-drawn customization and HTML Help. This sample demonstrates how to take advantage of these features in Visual C# .NET or in Visual C# 2005.
The ODForm sample mimics a number of Owner-Draw SDK samples from the MSDN documentation. This article intends to show you that the Owner-Draw functionality that you can achieve in unmanaged code is also possible in managed code. Additionally, this article provides some simple examples of context help and an implementation of a dockable toolbar.
The best use of this sample would probably be to load the project in the Visual Studio .NET or Visual Studio 2005 IDE and examine the property settings and event overrides for the different elements. For example, the combo box has the DrawMode
property set to OwnerDrawFixed
, and the DrawItem
event is handled to add a custom image for each item. Some other details are managed by checking the DrawItemState
, so that a dark background color can be used to indicate that an item is currently selected. All other user interface elements in the sample have been treated in a similar manner.
For context-sensitive help, the .NET Framework HelpProvider object stores the path to the Help file, and the individual elements expose HelpKeyword
properties, allowing for a range of choices when displaying help information. The list box takes advantage of the HelpString
property to simply display a pop-up window of information that can be drawn from the Help file or, as in this case, simply typed into the property window.
The dockable toolbar implementation demonstrates how easy it is to implement this functionality using Visual C# .NET or Visual C# 2005. The sample reparents the toolbar to a docking form when a drag attempt is detected, and places the toolbar back on the main form when the docking window is dragged near the original toolbar location.
The following file is available for download from the Microsoft Download Center:Download the ODForm.exe package now.
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.NET Samples - How To: Windows Forms