Native Tooltips in WPF (Part 2)

View source on GitHub.

In part 1 of this article I looked at the differences between WPF tooltips and ‘native’ (Win32) tooltips. In this part I present a sample WPF application that displays native tooltips. I’d planned to walk through some of the code here, but that turned out to be a bit tedious, so you’ll have to make do with the comments in the sample.

NativeToolTip.7z
11,271 bytes; SHA-1: 4ABD39CE46F5386E6D2DFF4A788AC3231DFA8765

Limitations:

• ToolTipService.Placement must be set to ‘Mouse’ (the default). Custom positioning is not available. (You could implement it with a tracking tooltip, but that’s easier said than done.)
• Native tooltip content is limited to simple strings.

Remarks:

• TTM_POPUP doesn’t work if the ‘rect’ field of the TOOLINFO isn’t set. This had me stumped for a while.