CONTROLS.C

/*++ 
 
Copyright (c) 1993  Microsoft Corporation 
 
Module Name: 
 
    controls.c 
 
Abstract: 
    This file implements the sun-classing and message processing of 
    the controls on the main ui dialog. 
 
Author: 
 
    Wesley Witt (wesw) 1-May-1993 
 
Environment: 
 
    User Mode 
 
--*/ 
 
#include <windows.h> 
#include <stdlib.h> 
#include <stdio.h> 
#include <string.h> 
 
#include "drwatson.h" 
#include "proto.h" 
#include "resource.h" 
 
 
typedef struct _tagCONTROLINFO { 
    struct _tagCONTROLINFO   *next; 
    HWND                     hwnd; 
    WNDPROC                  wndProc; 
} CONTROLINFO, *PCONTROLINFO; 
 
 
PCONTROLINFO   ciHead    = NULL; 
PCONTROLINFO   ciTail    = NULL; 
PCONTROLINFO   ciFocus   = NULL; 
PCONTROLINFO   ciDefault = NULL; 
 
 
 
void 
SetFocusToCurrentControl( void ) 
 
/*++ 
 
Routine Description: 
 
    Sets the focus  to the current control. 
 
Arguments: 
 
    None. 
 
Return Value: 
 
    None. 
 
--*/ 
 
{ 
    if (ciFocus != NULL) { 
        SetFocus( ciFocus->hwnd ); 
        SendMessage( ciFocus->hwnd, BM_SETSTATE, 0, 0 ); 
    } 
} 
 
LRESULT 
ControlWndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam ) 
 
/*++ 
 
Routine Description: 
 
    Processes focus messages and ensures that when the focus changes 
    from one button to another that the old button looses the focus 
    and the "default" state. 
 
Arguments: 
 
    Standard WNDPROC entry. 
 
Return Value: 
 
    LRESULT - Depending on input message and processing options. 
 
--*/ 
 
{ 
    PCONTROLINFO ci = ciHead; 
 
    while (ci->hwnd != hwnd) { 
        ci = ci->next; 
        if (ci == NULL) { 
            return FALSE; 
        } 
    } 
 
    switch(message) { 
        case WM_SETFOCUS: 
            ciFocus = ci; 
            break; 
 
        case BM_SETSTYLE: 
            if (wParam == BS_DEFPUSHBUTTON) { 
                ciDefault = ci; 
            } 
            break; 
 
        case BM_SETSTATE: 
            if ((GetWindowLong( hwnd, GWL_STYLE ) & 0xff) < BS_CHECKBOX) { 
                // 
                // change the button that had the focus 
                // 
                SendMessage( ciDefault->hwnd, 
                             BM_SETSTYLE, 
                             ( WPARAM ) BS_PUSHBUTTON, 
                             ( LPARAM ) TRUE 
                           ); 
                UpdateWindow( ciDefault->hwnd ); 
 
                // 
                // change the button that is getting the focus 
                // 
                SendMessage( hwnd, 
                             BM_SETSTYLE, 
                             ( WPARAM ) BS_DEFPUSHBUTTON, 
                             ( LPARAM ) TRUE 
                           ); 
                SetFocus( hwnd ); 
                UpdateWindow( hwnd ); 
            } 
            break; 
    } 
 
    return CallWindowProc( ci->wndProc, hwnd, message, wParam, lParam ); 
} 
 
 
BOOL CALLBACK 
EnumChildProc( HWND hwnd, LPARAM lParam ) 
 
/*++ 
 
Routine Description: 
 
    Subclass a controls in DrWatson's main window. 
 
Arguments: 
 
    hwnd    - Supplies the window handle for the main window. 
    lParam  - non used 
 
Return Value: 
 
    BOOL    - Returns TRUE if each of the buttons in the ButtonHelpTable is 
              subclassed. 
 
--*/ 
 
{ 
    PCONTROLINFO ci; 
 
    // 
    // add the control to the linked list 
    // 
    ci = (PCONTROLINFO) malloc( sizeof(CONTROLINFO) ); 
    if (ci == NULL) { 
        return FALSE; 
    } 
    memset( ci, 0, sizeof(CONTROLINFO) ); 
 
    if (ciHead == NULL) { 
        ciHead = ciTail = ci; 
    } 
    else { 
        ciTail->next = ci; 
        ciTail = ci; 
    } 
 
    // 
    // save the HWND 
    // 
    ci->hwnd = hwnd; 
 
    // 
    // change the WNDPROC and save the address of the old one 
    // 
    ci->wndProc = (WNDPROC) SetWindowLong( hwnd, 
                                           GWL_WNDPROC, 
                                           (LONG)ControlWndProc 
                                         ); 
 
    if (GetWindowLong( hwnd, GWL_STYLE ) & BS_DEFPUSHBUTTON) { 
        ciDefault = ci; 
    } 
 
    return TRUE; 
} 
 
BOOL 
SubclassControls( HWND hwnd ) 
 
/*++ 
 
Routine Description: 
 
    Subclass the controls in DrWatson's main window. 
 
Arguments: 
 
    hWnd    - Supplies the window handle for the main window. 
 
Return Value: 
 
    BOOL    - Returns TRUE if each of the buttons in the ButtonHelpTable is 
              subclassed. 
 
--*/ 
 
{ 
    EnumChildWindows( hwnd, EnumChildProc, 0 ); 
 
    return TRUE; 
}