Button Default Message Processing - Win32 Programmer's Reference

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Button Default Message Processing

The window procedure for the predefined button control window class carries out default processing for all messages that the button control procedure does not process. When the button control procedure returns FALSE for any message, the predefined window procedure checks the messages and performs the default actions listed in the following table.

Message

Default action

BM_CLICK	Sends the button a WM_LBUTTONDOWN and a WM_LBUTTONUP message, and sends the parent window a BN_CLICKED notification message.
BM_GETCHECK	Returns the check state of the button.
BM_GETIMAGE	Returns the handle of the bitmap or icon associated with the button or NULL if the button has no bitmap or icon.
BM_GETSTATE	Returns the current check state, push state, and focus state of the button.
BM_SETCHECK	Sets the check state for all styles of radio buttons and check boxes. If the wParam parameter is greater than zero for radio buttons, the button is given the WS_TABSTOP style.
BM_SETIMAGE	Associates the specified bitmap or icon handle with the button and returns the handle of the previous bitmap or icon.
BM_SETSTATE	Sets the push state of the button. For owner-drawn buttons, a WM_DRAWITEM message is sent to the parent window if the state of the button has changed.
BM_SETSTYLE	Sets the button style. If the low-order word of the lParam parameter is TRUE, the button is redrawn.
WM_CHAR	Checks a check box or automatic check box when the user presses the plus (+) or equal (=) keys. Unchecks a check box or automatic check box when the user presses the minus () key.
WM_ENABLE	Paints the button.
WM_ERASEBKGND	Erases the background for owner-drawn buttons. The backgrounds of other buttons are erased as part of the WM_PAINT and WM_ENABLE processing.
WM_GETDLGCODE	Returns values indicating the type of input processed by the default button procedure, as shown in the following table.

Button style

Returns

BS_AUTOCHECKBOX

DLGC_WANTCHARS | DLGC_BUTTON

BS_AUTORADIOBUTTON

DLGC_RADIOBUTTON

BS_CHECKBOX

DLGC_WANTCHARS | DLGC_BUTTON

BS_DEFPUSHBUTTON

DLGC_DEFPUSHBUTTON

BS_GROUPBOX

DLGC_STATIC

BS_PUSHBUTTON

DLGC_UNDEFPUSHBUTTON

BS_RADIOBUTTON

DLGC_RADIOBUTTON

WM_GETFONT	Returns a handle of the current font.
WM_KEYDOWN	Pushes the button if the user presses the SPACEBAR.
WM_KEYUP	Releases the mouse capture for all cases except the TAB key.
WM_KILLFOCUS	Removes the focus rectangle from a button. For push buttons and default push buttons, the focus rectangle is invalidated. If the button has the mouse capture, the capture is released, the button is not clicked, and any push state is removed.
WM_LBUTTONDBLCLK	Sends a BN_DBLCLK notification message to the parent window for radio buttons and owner-drawn buttons. For other buttons, a double-click is processed as a WM_LBUTTONDOWN message.
WM_LBUTTONDOWN	Highlights the button if the position of the mouse cursor is within the button's client rectangle.
WM_LBUTTONUP	Releases the mouse capture if the button had the mouse capture.
WM_MOUSEMOVE	Performs the same action as WM_LBUTTONDOWN, if the button has the mouse capture. Otherwise, no action is performed.
WM_NCCREATE	Turns any BS_OWNERDRAW button into a BS_PUSHBUTTON button.
WM_NCHITTEST	Returns HTTRANSPARENT, if the button control is a group box.
WM_PAINT	Draws the button according to its style and current state.
WM_SETFOCUS	Draws a focus rectangle on the button getting the focus. For radio buttons and automatic radio buttons, the parent window is sent a BN_CLICKED notification message.
WM_SETFONT	Sets a new font and optionally updates the window.
WM_SETTEXT	Sets the text of the button. In the case of a group box, the message paints over the preexisting text before repainting the group box with the new text.
WM_SYSKEYUP	Releases the mouse capture for all cases except the TAB key.

The predefined window procedure passes all other messages to the DefWindowProc function for default processing.

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