WM BUTTON1MOTIONSTART

This message occurs when the operator initiates a drag operation by moving the mouse while pressing button one on the pointing device.

Syntax

param1
    POINTS ptspointerpos; /* Pointer position. */

param2
    USHORT fsHitTestres; /* Hit-test result. */

Parameters

ptspointerpos (POINTS) - input

Pointer position in window coordinates relative to the bottom-left corner of the hit-tested window, when the drag operation is started.

fsHitTestres (USHORT) - input

Hit-test result. Provides the hit-test result, which determines the window to be associated with this message. For details of the possible values, see WM_HITTEST.

Returns

rc (BOOL) - returns

Processed indicator.

TRUE: Message processed

FALSE: Message ignored

Remarks

This message is posted to the application queue associated with the window that is to receive the pointer-button information.

Default Processing

The default window procedure sends the message to the owner window if it exists, otherwise it takes no action on this message, other than to set rc to FALSE.