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Learn more about: Handling TTN_NEEDTEXT Notification for Tool Tips |
Handling TTN_NEEDTEXT Notification for Tool Tips |
11/04/2016 |
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d0370a65-21ba-4676-bcc5-8cf851bbb15c |
As part of enabling tool tips, you handle the TTN_NEEDTEXT message by adding the following entry to your owner window's message map:
[!code-cppNVC_MFCControlLadenDialog#40]
memberFxn
The member function to be called when text is needed for this button.
Note that the ID of a tool tip is always 0.
Declare your handler function in the class definition as follows:
[!code-cppNVC_MFCControlLadenDialog#53]
where the italicized parameters are:
id
Identifier of the control that sent the notification. Not used. The control id is taken from the NMHDR structure.
pNMHDR
A pointer to the NMTTDISPINFO structure. This structure is also discussed further in The TOOLTIPTEXT Structure.
pResult
A pointer to result code you can set before you return. TTN_NEEDTEXT handlers can ignore the pResult parameter.
As an example of a form-view notification handler:
[!code-cppNVC_MFCControlLadenDialog#54]
Call EnableToolTips (this fragment taken from OnInitDialog):
[!code-cppNVC_MFCControlLadenDialog#55]