Default Hot-Key Message Processing

This section describes the window messages handled by the window procedure for the predefined HOTKEY_CLASS window class used with hot-key controls.

Message	Processing performed
WM_CHAR	Retrieves the virtual-key code.
WM_CREATE	Initializes the hot-key control, sets no hot-key rules, and uses the system font.
WM_ERASEBKGND	Hides the caret, calls the DefWindowProc function, and shows the caret again.
WM_GETDLGCODE	Returns a combination of the DLGC_WANTCHARS and DLGC_WANTARROWS values.
WM_GETFONT	Retrieves the font.
WM_KEYDOWN	Calls the DefWindowProc function if the key is ENTER, TAB, SPACE BAR, DEL, ESC, or BACKSPACE. If the key is SHIFT, CTRL, or ALT, it checks whether the combination is valid and, if it is, sets the hot key using the combination. Other keys are set as hot keys without their validity being checked first.
WM_KEYUP	Retrieves the virtual-key code.
WM_KILLFOCUS	Destroys the caret.
WM_LBUTTONDOWN	Sets the focus to the window.
WM_NCCREATE	Sets the WS_EX_CLIENTEDGE window style.
WM_PAINT	Paints the hot-key control.
WM_SETFOCUS	Creates and shows the caret.
WM_SETFONT	Sets the font.
WM_SYSCHAR	Retrieves the virtual-key code.
WM_SYSKEYDOWN	Calls the DefWindowProc function if the key is ENTER, TAB, SPACE BAR, DEL, ESC, or BACKSPACE. If the key is SHIFT, CTRL, or ALT, it checks whether the combination is valid and, if it is, sets the hot key using the combination. Other keys are set as hot keys without their validity being checked first.
WM_SYSKEYUP	Retrieves the virtual-key code.

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