Window messages

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Menu related

A lot of this information was posted by Martin Lafaix (http://lafaix.online.fr) in OS/2-NGs, so credits probably belong to him :-). He wrote: "Those interested in menu stuff can read the relevant code parts in xwp."

All pointers used by BYPOS messages are *not* thunked by PM when the messages are sent, so you *must* do the conversion yourself, using something like : 

#define MAKE_16BIT_POINTER(p) ((PVOID)MAKEULONG(LOUSHORT(p), \
                                                (HIUSHORT(p) << 3) | 7))

There are also some undocumented menu window styles: 

 MS_ROOT (0x00000008L)  menu is the root of the menu hierarchy
 MS_POPUP (0x00000010L) menu is a popup-menu

#define MM_MENUCHAR 0x003f

Non-mnemonic menu char pressed. 

#define MM_DISMISSMENU     0x0187

#define MM_FNEEDACTIVATE    0x0196
   Called when menu is need to be activated.
mp1 
pointer to RECTL structure which contains screen coordinates of menu item currently selected
mp2 
SHORT1 contains an item ID if PU_SELECTITEM and/or PU_POSITIONONITEM flags is specified for menu; SHORT2 contains some u_PU_* flags combination (see below)

Note: blocking this message disables menu pointer moving 

  #define u_PU_NONE                 0x0000 /* If invoked by keyboard */
  /*? #define u_PU_SELECTITEM           0x0010 / * Set selected item (use with kbd) */
  #define u_PU_POSITIONONITEM       0x0020 /* Need idItem parameter */
  #define u_PU_KEYBOARD             0x0100 /* If keyboard use allowed */
  #define u_PU_MOUSEBUTTON3         0x0200 /* If button3 use allowed */
  #define u_PU_MOUSEBUTTON2         0x0400 /* If button2 use allowed */
  #define u_PU_MOUSEBUTTON1         0x0800 /* If button1 use allowed */
  #define u_PU_MOUSEBUTTON1DOWN     0x1000 /* If invoked by button 1 */
  #define u_PU_MOUSEBUTTON2DOWN     0x2000 /* If invoked by button 2 */
  #define u_PU_MOUSEBUTTON3DOWN     0x3000 /* If invoked by button 3 */
  #define u_PU_VCONSTRAIN           0x4000 /* Keep menu on top and bottom edge */
  #define u_PU_HCONSTRAIN           0x8000 /* Keep menu on left and right edge */

PU_* constants actual for MM_FNEEDACTIVATE message 

#define MM_DISMISS 0x0197

Cause menu to be hidden Note: blocking this message disables menu hiding 

#define MM_STARTTRACKING 0x0198

Capture mouse and begin tracking 

#define MM_SUMMONCHAIN 0x0199

Display menu and all owner menus 

#define WM_019a   0x019a

MM_DISMISSCHAIN (hide menu and all owners menus) 

#define WM_019b   0x019b

MM_ISCHAINENABLED (are menu and all all owners enabled ?) 

#define WM_019c    0x019c

MM_QUERYMENUSAVEDFOCUS (query window to receive focus at end) 

#define WM_019d    0x019d

MM_SETMENUSAVEDFOCUS (set window to receive focus at end) 

#define MM_SELECTITEMBYPOS    0x019e

Set selection state by its position. 

#define WM_019f     0x019f

??? 

#define MM_MATCHMNEMONIC 0x01f0

Find match of mnemonic char in menu. 

#define MM_DELETEITEMBYPOS 0x01f1

Delete a menu item by its position. 

#define MM_REMOVEITEMBYPOS 0x01f2

Remove a menu item by its position. 

#define MM_QUERYITEMBYPOS  0x01f3

Query MENUITEM by its position. 

#define MM_SETITEMBYPOS 0x01f4

Set MENUITEM by its position. 

#define MM_QUERYITEMATTRBYPOS     0x01f5
   Query the attribute by its position
mp1 
0 to number of items in menu. Position of the item to query.
mp2 
Requested attributes mask.

Returns the current state of the attributes requested.

The attributes returned are the current state values of the menu item ANDed with the attribute mask specified in mp2. It does not change any of the attributes of the menu item.

1 or more msgs sent to menu under pointer for each mouse move. Apparently used to identify which menuitem to hilite. Seen when XWP's 'Sliding menu selection' is enabled.

(Source: newsgroup) 

#define MM_SETITEMATTRBYPOS 0x01f6

Set the attribute by its position

mp1 
position of the item to set
mp2 
SHORT1FROMMP(mp2) 
attributes mask
SHORT2FROMMP(mp2) 
attribute flags

Teturns TRUE if the attributes were successfully modified.

Only those attributes specified by the attributes mask are modified by this message

(Source: newsgroup) 

#define MM_QUERYITEMTEXTBYPOS 0x01f7

Query text of item by its position.

mp1 
SHORT1FROMMP(mp1) 
Position of the item to query the text.
SHORT2FROMMP(mp2) 
Maximum nomber of bytes to copy (includes the null termination character).
mp2 
PSTRL (16-bit pointer)

Returns the length of the string copied to PSTRL.

(Source: newsgroup)

  1. define MM_QUERYITEMTEXTLENGTHBYPOS 0x01f8

Query text length by its position.

mp1 
position of the item to query
mp2 
unused

Returns the length of the string.

(Source: newsgroup) 

#define MM_SETITEMTEXTBYPOS 0x01f9

Set text of item by its position.

mp1 
position of item to query
mp2 
PSTRL (16-bit pointer)

Returns TRUE if the request is successful.

(Source: newsgroup) 

#define MM_SETITEMHANDLEBYPOS 0x01fa

Set bitmap or ownerdraw handle by its position.

mp1 
position of the item to query
mp2 
item handle

Returns TRUE if the request is successful.

This message only applies to menu items with the MIS_BITMAP or MIS_OWNERDRAW style.

(Source: newsgroup) 

#define MM_PORTHOLEINIT 0x01fb

Submenu about to be displayed

mp1 
SHORT1FROMMP(mp1) 
position of submenu in the menu
SHORT2FROMMP(mp1) 
attribute of the menu item
mp2 
menu handle containing the item

Return code ignored for this message.

This message is sent from the menu code to its owner just prior to summoning a pop-up menu. Upon return from the processing of this message, PM will again retrieve the submenu handle for the selected item. This allows an application to replace the submenu just prior to the submenu being displayed.

(Source: newsgroup) 

#define MM_SETITEMCHECKMARKBYPOS 0x01fc

Set checkmark bitmap by its position

mp1 
SHORT1FROMMP(mp1) 
Position of menu item to set
SHORT2FROMMP(mp1) 
TRUE bitmap is for the checked state FALSE bitmap is for the unchecked state
mp2 
Bitmap handle

Returns TRUE if the request is successful.

The checkmark can be set for both the checked or unchecked state. If a bitmap is not specified for one of the states, the system default bitmap is used.

(Source: newsgroup) 

#define MM_SETITEMCHECKMARK 0x0210

Set checkmark to display for item

mp1 
SHORT1FROMMP(mp1) 
ID of the menu item to set
SHORT2FROMMP(mp1) 
TRUE bitmap is for checked state FALSE bitmap is for the unchecked state.
mp2 
bitmap handle

Returns TRUE if the request is successful.

If a bitmap is not specified for one of the states, the system default bitmap is used. 

#define WM_0693      0x0693
mp1 
ctl id
mp2 
hwnd

Sent by MS_ACTIONBAR menus to owner on MBx-down.

(Source: newsgroup)

There seems to be no equivalent to MM_QUERYSELITEMID (i.e., querying the currently selected item by position). That's why, in xwp, the autohiliting behaves strangely in some netscape 4.x menus, where most items have the same ID.

(Source: newsgroup)

Misc messages

#define WM_0444     0x0444
mp1 
0
mp2 
0

Sent to titlebar by frame when activation state changes. 

#define WM_0453      0x0453

??? 

#define WM_0692      0x0692
mp1 
1
mp2 
hwnd

Periodically sent by a modal dialog to itself. 

#define WM_MOVEACROSSWINDOW      0x041F
mp1 
unknown
mp2 
unknown

Called when mouse pointer moves across window. Note: this is notify message. 

#define WM_MOVEALONGWINDOW      0x041E
mp1 
unknown
mp2 
unknown

Called when mouse pointer moves along window. Note: this is notify message. 

#define WM_PAINT_WITHHPS      0x020D
mp1 
hps to be used
mp2 
uknown (possibly not used)

Basically the same as WM_PAINT but HPS is given (so no WinBeginPaint and WinEndPaint are required). All standard controls support this.

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