Page 63 - DCAP408_WEB_PROGRAMMING

Unit 4: Windows Controls

4.5.6 Button Notification Codes Notes

Notifications

Topic Contents
BCN_DROPDOWN Sent when the user clicks a drop down arrow on a button. The
parent window of the control obtains this notification code in the
form of a WM_NOTIFY message.
BCN_HOTITEMCHANGE Informs the button control owner that the mouse is entering or
leaving the client area of the button control. The button control
sends this notification code in the form of a WM_NOTIFY message.

BN_CLICKED Sent when the user clicks a button. The parent window of the button
obtains the BN_CLICKED notification code through the
WM_COMMANDmessage.
BN_DBLCLK Sent when the user double-clicks a button. This notification code is
sent automatically for BS_USERBUTTON,BS_RADIOBUTTON,
and BS_OWNERDRAW buttons. Other button types send
BN_DBLCLK only if they have the BS_NOTIFY style. The parent
window of the button obtains the BN_DBLCLK notification code
via the WM_COMMAND message.

BN_DISABLE Sent when a button is disabled. This notification code is offered only
for compatibility with 16-bit versions of Windows earlier than
version 3.0. Applications should use the BS_OWNERDRAW
button style and the DRAWITEMSTRUCT structure for this task.
The parent window of the button obtains the BN_DISABLE
notification code via the WM_COMMANDmessage.
BN_DOUBLECLICKED Sent when the user double-clicks a button. This notification code is
sent automatically for BS_USERBUTTON,BS_RADIOBUTTON,
and BS_OWNERDRAW buttons. Other button types send
BN_DOUBLECLICKED only if they have the BS_NOTIFY style.
The parent window of the button obtains the BN_DOUBLECLICKED
notification code via the WM_COMMAND message.
BN_HILITE Sent when the user selects a button. This notification code is offered
only for compatibility with 16-bit versions of Windows earlier than
version 3.0. Applications should use the BS_OWNERDRAW
button style and the DRAWITEMSTRUCT structure for this task.
The parent window of the button obtains the BN_HILITE
notification code via the WM_COMMAND message.
BN_KILLFOCUS Sent when a button loses the keyboard focus. The button must have
the BS_NOTIFY style to send this notification code. The parent
window of the button receives the BN_KILLFOCUS notification
code via the WM_COMMANDmessage.
BN_PAINT Sent when a button should be painted. This notification code is
offered only for compatibility with 16-bit versions of Windows
earlier than version 3.0. Applications should use the
BS_OWNERDRAW button style and the DRAWITEMSTRUCT
structure for this task. The parent window of the button obtains the
BN_PAINT notification code through the WM_COMMAND
message.
BN_PUSHED Sent when the push state of a button is set to pushed. This
notification code is offered only for compatibility with 16-bit
versions of Windows earlier than version 3.0. Applications should
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