Default Up-Down Controls Message Processing
This section describes the window message processing performed by an up-down control.| Message
| Processing performed
|
| WM_CREATE
| Allocates and initializes a private data structure and saves its address as
window data.
|
| WM_DESTROY
| Frees data allocated during WM_CREATE processing.
|
| WM_ENABLE
| Invalidates the window.
|
| WM_KEYDOWN
| Changes the current position in the case of an
UP ARROW or DOWN ARROW key. |
| WM_KEYUP
| Ends changing the position.
|
| WM_LBUTTONDOWN
| Captures the mouse. If the buddy window is an edit control or list box, it
sets the focus to the buddy window. If the mouse is over the up or down button, it
begins changing the position and sets a timer.
|
| WM_LBUTTONUP
| Ends changing the position and releases the mouse capture if the up-down
control has captured the mouse. If the buddy window is an edit control, it selects
all the text in the edit control.
|
| WM_PAINT
| Paints the up-down control. If the wParam parameter is non-NULL, the control assumes that the value is an HDC and
paints using that device context.
|
| WM_TIMER
| Changes the current position if the mouse is being held down over a button and
a sufficient interval has elapsed.
|
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