CODEWITHSUNDEEP
c++windowswinapilistviewtooltip
Mr.C64
Mr.C64

Reputation: 42984

Wrong stem position in balloon-style tooltips in report list-view

I'd like to change the default style of the list-view control's tooltips to balloon.

I first called ListView_GetToolTips() to get the HWND of the list-view's tooltips control, and then used GetWindowLongPtr()/SetWindowLongPtr() to add the TTS_BALLOON style.

I handle LVN_GETINFOTIP to customize the tooltip for the items (first column) in the list-view: the tooltip texts that appear for the first column items are actually a copy of the text of the third column. The other columns (subitems) are managed automatically by the list-view.

The balloon-style tooltips for the first column items seem OK; their stems are correctly positioned:

enter image description here

But the tooltips for the second column seem drawn wrongly, e.g. the balloon is drawn as if it was referred to a subitem in a row below the actual row pointed by the mouse cursor.
In the following picture, the "star" indicates the position in which the mouse cursor was when the tooltip appeared, but the tooltip's stem points to a row below, marked with an ellipse:

enter image description here

The strange thing is that the tooltips for the third column seem drawn correctly.

Is this a bug in the list-view control? (I'm using Windows 7.)
Or what am I missing here?

Upvotes: 1

Views: 404

Answers (1)

Jonathan Potter
Jonathan Potter

Reputation: 37192

The ListView uses a tracking tooltip and positions it to unfold and reveal the hidden text in a column that's too small. It's not expecting its tooltip to be a balloon and so doesn't compensate for that.

You'd need to sub-class the tooltip itself, watch for TTM_TRACKPOSITION messages from the ListView, and adjust the coordinates.

Your second question - the shaded background comes from the system theme. You should be able to get it by calling SetWindowTheme on the tooltip (I'm not sure why the ListView disables themes for the tip).

Upvotes: 2

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