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Window Activation
When the user clicks an inactive top-level window or the child window of a
inactive top-level window, Windows sends the WM_MOUSEACTIVATE message (among others) to the top-level or child window. Windows sends this
message after posting the WM_NCHITTEST message to the window, but before posting the button down message. When
WM_MOUSEACTIVATE is passed to the DefWindowProc function, Windows activates the top-level window and then posts the button
down message to the top-level or child window.
By processing WM_MOUSEACTIVATE, a window can control whether the top-level
window becomes the active window as a result of a mouse click, and whether the
window that was clicked receives the subsequent button down message. It does so by
returning one of the following values after processing WM_MOUSEACTIVATE.
Value
| Meaning
| MA_ACTIVATE
| Activates the window and does not discard the mouse message.
| MA_NOACTIVATE
| Does not activate the window and does not discard the mouse message.
| MA_ACTIVATEANDEAT
| Activates the window and discards the mouse message.
| MA_NOACTIVATEANDEAT
| Does not activate the window but discards the mouse message.
|
Related Links
Software for Delphi and C++ Builder developers
Software for Visual Studio .NET developers
Software for Visual Basic 6 developers
Delphi Tips&Tricks
MegaDetailed.NET
More Online Helps
Win32 Multimedia Programmer's Reference (mmedia.hlp)
OLE Programmer's Reference (ole.hlp)
Microsoft Windows Pen API Programmer's Reference (penapi.hlp)
Microsoft Windows Sockets 2 Reference (sock2.hlp)
Microsoft Windows Telephony API (TAPI) Programmer's Reference (tapi.hlp)
Unix Manual Pages
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