Changes the color of a divider between header items to indicate the destination of an external drag-and-drop operation. You can use this macro or send the HDM_SETHOTDIVIDER message explicitly.
A handle to a header control.
A value specifying how dwInputValue is to be interpreted. The value in this field can be one of the following:
Indicates that dwInputValue holds client coordinates of the pointer.
Indicates that dwInputValue holds a divider index value.
The value held here is interpreted depending on the value of flag.
If flag is TRUE, dwInputValue represents the x- and y- client coordinates of the pointer. The x-coordinate is in the low word, and the y-coordinate is in the high word. Upon receiving the message, the header control highlights the appropriate divider based on the dwInputValue coordinates.
If flag is FALSE, dwInputValue represents the integer index of the divider that will be highlighted.
Returns the index of the divider that the control highlighted.
A header control set to the HDS_DRAGDROP style produces this effect automatically. This message is intended to be used when the owner of the control handles drag-and-drop operations manually.
Minimum supported client
|Windows 2000 Professional [desktop apps only]|
Minimum supported server
|Windows 2000 Server [desktop apps only]|