User-machine Interaction messages
[Messages]

Modules

Defines


Define Documentation

#define MSG_ACTIVE   0x0033

Indicates that the window has gained the input focus because the user clicked the window.

This message is sent to the window procedure after the user clicked the window and it has gained the input focus.

Definition at line 830 of file window.h.

#define MSG_ACTIVEMENU   0x0040

Indicates that the user activates the menu bar and tracks it.

This message is sent to the window procedure when the user activates the menu bar and tracks it.

If you want to change the states of menu items in the submenu before displaying it, you can handle this message.

 MSG_ACTIVEMENU
 int pos = (int)wParam;
 HMENU submenu = (HMENU)lParam;
Parameters:
pos The position of the activated submenu. The position value of the first submenu is 0.
submenu The handle to the activated submenu.

Example:

/*
 * This handler checks the specified menu items to contain
 * a radio bitmap by calling CheckMenuRadioItem function,
 * if the submenu at position 2 has been activated.
 */
        case MSG_ACTIVEMENU:
            if (wParam == 2) {
                CheckMenuRadioItem ((HMENU)lParam, 
                    IDM_40X15, IDM_CUSTOMIZE, 
                    pConInfo->termType, MF_BYCOMMAND);
                CheckMenuRadioItem ((HMENU)lParam, 
                    IDM_DEFAULT, IDM_BIG5, 
                    pConInfo->termCharset, MF_BYCOMMAND);
            }
        break;

Definition at line 866 of file window.h.

#define MSG_CHANGESIZE   0x0022

Change window size.

Definition at line 710 of file window.h.

#define MSG_CHILDHIDDEN   0x0034

Hide child window.

Definition at line 836 of file window.h.

#define MSG_CSIZECHANGED   0x0027

Indicates the size of the client area of the window has been changed.

This message is sent as a notification to the window when the size of the client area has been changed.

 MSG_CSIZECHANGED
 int client_width = (int)wParam;
 int client_height = (int)lParam;
Parameters:
client_width The width of the client area.
client_height The height of the client area.

Definition at line 786 of file window.h.

#define MSG_DEACTIVEMENU   0x0041

Indicates the end of the tracking of a menu bar or a popup menu.

This message is sent to the window procedure when the user has closed the tracking menu bar or popup menu.

 MSG_DEACTIVEMENU
 HMENU menubar = (HMENU)wParam;
 HMENU submenu = (HMENU)lParam;
Parameters:
menubar The handle to the menu bar. It will be zero when the deactivated menu is a popup menu.
submenu The handle to the submenu.

Definition at line 885 of file window.h.

#define MSG_HITTEST   MSG_NCHITTEST

Hit test in non-client area.

See also:
MSG_NCHITTEST

Definition at line 704 of file window.h.

#define MSG_HSCROLL   0x0042

Indicates that the user has clicked the horizontal scroll bar.

This message is sent to the window procedure when the user has clicked the horizontal scroll bar and changed the position of the thumb.

 MSG_HSCROLL
 int hs_nc = (int)wParam;
Parameters:
hs_nc The scrolling code, can be one of the following values:

  • SB_LINELEFT
    The user clicked the left arrow on the bar.
  • SB_LINERIGHT
    The user clicked the right arrow on the bar.
  • SB_PAGELEFT
    The user clicked the left page area on the bar.
  • SB_PAGERIGHT
    The user clicked the right page area on the bar.
  • SB_THUMBPOSITION
    The user set a new thumb position.
  • SB_THUMBTRACK
    The user is draging and tracking the thumb.
  • SB_ENDSCROLL
    The end of scrolling.

Definition at line 1014 of file window.h.

#define MSG_KILLFOCUS   0x0031

Indicates that the window has lost the input focus.

Parameters:
lparam The parameter passed into used for pass killfocus msg to child control if lparam > 0.

This message is sent to the window procedure after the window losts the input focus.

Definition at line 810 of file window.h.

#define MSG_MOUSEACTIVE   0x0032

Indicates that the window has gained the input focus because the user clicked the window.

This message is sent to the window procedure after the user clicked the window and it has gained the input focus.

Definition at line 820 of file window.h.

#define MSG_MOUSEMOVEIN   0x0050

Indicates the mouse is moved in/out the area of the window.

This message is posted to the window when the user moves the mouse in/out the area of the window.

 MSG_MOUSEMOVEIN
 BOOL in_out = (BOOL)wParam;
Parameters:
in_out Indicates whether the mouse has been moved in the window or out the window.

Definition at line 1075 of file window.h.

#define MSG_NCHITTEST   0x0021

Hit test in non-client area. This is an async message.

Definition at line 696 of file window.h.

#define MSG_NCSETCURSOR   0x0044

Sets cursor shape in the non-client area.

This message is posted to the window under the cursor when the user moves the mouse in order to give the chance to change the cursor shape. The default handler set the cursor shape to the default cursor of the window. If you set a new cursor shape, your message handler should return immediately.

See also:
MSG_SETCURSOR

Definition at line 1058 of file window.h.

#define MSG_QUERYCLIENTAREA   0x0024

Query client area.

Definition at line 719 of file window.h.

#define MSG_SETCURSOR   0x0020

Sets cursor shape in the client area.

This message is posted to the window under the cursor when the user moves the mouse in order to give the chance to change the cursor shape. The default handler set the cursor shape to the default cursor of the window. If you set a new cursor shape, your message handler should return immediately.

 MSG_SETCURSOR
 int cx = LOSWORD (lParam);
 int cy = HISWORD (lParam);
Parameters:
cx,cy The client coordinates of the cursor.

Example:

/*
 * The following MSG_SETCURSOR handler set the cursor
 * shape to the arrow cursor when the window is disabled.
 */
        case MSG_SETCURSOR:
            if (GetWindowStyle (hwnd) & WS_DISABLED) {
                SetCursor (GetSystemCursor (IDC_ARROW));
                return 0;
            }
        break;
See also:
MSG_NCSETCURSOR

Definition at line 630 of file window.h.

#define MSG_SETFOCUS   0x0030

Indicates that the window has gained the input focus.

Parameters:
lparam The parameter passed into used for pass setfocus msg to child control if lparam > 0.

This message is sent to the window procedure after the window gains the input focus.

Definition at line 798 of file window.h.

#define MSG_SIZECHANGED   0x0026

Indicates the size of the window has been changed.

This message is sent to the window when the size has been changed. If you want adjust the size of the client area of the window, you should handle this message, change the values of the client area, and return non-zero value to indicate that the client area has been modified.

 MSG_SIZECHANGED
 RECT* rcClient = (RECT*)lParam;
Parameters:
rcClient The pointer to a RECT structure which contains the new client area.

Example:

                case MSG_SIZECHANGED:
                {
                        RECT* rcClient = (RECT*)lParam;
                        rcClient->right = rcClient->left + _WIDTH;
                        rcClient->bottom = rcClient->top + _HEIGHT;
                        return 1;
                }

Definition at line 768 of file window.h.

#define MSG_SIZECHANGING   0x0025

Indicates the size of the window is being changed.

This message is sent to the window when the size is being changed. If you want to control the actual position and size of the window when the size is being changed (this may be caused by MoveWindow or other functions), you should handle this message, and return the actual position and size of the window through the second parameter.

 MSG_SIZECHANGING
 const RECT* rcExpect = (const RECT*)wParam;
 RECT* rcResult = (RECT*)lParam;
Parameters:
rcExpect The expected size of the window after changing.
rcResult The actual size of the window after changing.

Example:

/*
 * The handler set the actual size of the window always
 * to be _WIDTH wide and _HEIGHT high.
 */
                case MSG_SIZECHANGING:
                {
                        const RECT* rcExpect = (const RECT*)wParam;
                        RECT* rcResult = (RECT*)lParam;

                        rcResult->left = rcExpect->left;
                        rcResult->top = rcExpect->top;
                        rcResult->right = rcExpect->left + _WIDTH;
                        rcResult->bottom = rcExpect->top + _HEIGHT;
                    return 0;
                }

Definition at line 744 of file window.h.

#define MSG_VSCROLL   0x0043

Indicates that the user has clicked the vertical scroll bar.

This message is sent to the window procedure when the user has clicked the vertical scroll bar and changed the position of the thumb.

 MSG_HSCROLL
 int vs_nc = (int)wParam;
Parameters:
vs_nc The scrolling code, can be one of the following values:

  • SB_LINEUP
    The user clicked the up arrow on the bar.
  • SB_LINEDOWN
    The user clicked the down arrow on the bar.
  • SB_PAGEUP
    The user clicked the up page area on the bar.
  • SB_PAGEDOWN
    The user clicked the down page area on the bar.
  • SB_THUMBPOSITION
    The user set a new thumb position.
  • SB_THUMBTRACK
    The user is draging and tracking the thumb.
  • SB_ENDSCROLL
    The end of scrolling.

Definition at line 1044 of file window.h.

#define MSG_WINDOWDROPPED   0x0051

Indicates that user dropped window. server to client; (wParam, lParam): result rectangle.

Definition at line 1082 of file window.h.

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