emwin之CHECKBOX控件的通知代码的响应规则

@2018-08-28
【小记】
在 case WM_INIT_DIALOG: 中使用 CHECKBOX_SetState()函数改变了复选框状态，就会产生 WM_NOTIFICATION_VALUE_CHANGED 通知代码，则在 case WM_NOTIFY_PARENT: 中就会进入该分支
【调试记录】
下段代码的执行顺序 ①——⑤——②——⑥——③——⑦——④，这都是因使用了函数 CHECKBOX_SetState（）引起的
  1 case WM_INIT_DIALOG:
  2     //
  3     // Initialization of 'opt1-Checkbox'
  4     //
  5     hItem = WM_GetDialogItem(pMsg->hWin, ID_CHECKBOX_0);
  6     CHECKBOX_SetText(hItem, ttEnable[ttEnableOpt1]);
  7     CHECKBOX_SetFont(hItem, GUI_FONT_16B_1);
  8     CHECKBOX_SetTextColor(hItem, GUI_MAKE_COLOR(0x00FF0000));
  9     CHECKBOX_SetState(hItem, ttEnableOpt1);    // --①
 10     //
 11     // Initialization of 'opt2-Checkbox'
 12     //
 13     hItem = WM_GetDialogItem(pMsg->hWin, ID_CHECKBOX_1);
 14     CHECKBOX_SetText(hItem, ttEnable[ttEnableOpt2]);
 15     CHECKBOX_SetFont(hItem, GUI_FONT_16B_1);
 16     CHECKBOX_SetTextColor(hItem, GUI_MAKE_COLOR(0x00FF0000));
 17     CHECKBOX_SetState(hItem, ttEnableOpt2);    // --②
 18     //
 19     // Initialization of 'opt3-Checkbox'
 20     //
 21     hItem = WM_GetDialogItem(pMsg->hWin, ID_CHECKBOX_2);
 22     CHECKBOX_SetText(hItem, ttEnable[ttEnableOpt3]);
 23     CHECKBOX_SetFont(hItem, GUI_FONT_16B_1);
 24     CHECKBOX_SetTextColor(hItem, GUI_MAKE_COLOR(0x00FF0000));
 25     CHECKBOX_SetState(hItem, ttEnableOpt3);    // --③
 26     // USER START (Optionally insert additional code for further widget initialization)
 27     // --④
 28     WM_MakeModal(pMsg->hWin);
 29     initFlag = 1;
 30     
 31     // USER END
 32     break;
 33 
 34  case WM_NOTIFY_PARENT:
 35     Id    = WM_GetId(pMsg->hWinSrc);
 36     NCode = pMsg->Data.v;
 37     switch(Id) {
 38         case ID_CHECKBOX_0: // Notifications sent by 'opt1-Checkbox'
 39             switch(NCode) {
 40                 case WM_NOTIFICATION_CLICKED:
 41                     // USER START (Optionally insert code for reacting on notification message)
 42                     // USER END
 43                     break;
 44                 case WM_NOTIFICATION_RELEASED:
 45                     // USER START (Optionally insert code for reacting on notification message)
 46                     // USER END
 47                     break;
 48                 case WM_NOTIFICATION_VALUE_CHANGED:
 49                     // USER START (Optionally insert code for reacting on notification message)
 50                 　　 // --⑤
 51                     if(1 == initFlag)
 52                     {
 53                         ttEnableOpt1 = !ttEnableOpt1;
 54                         hItem = WM_GetDialogItem(pMsg->hWin, ID_CHECKBOX_0);
 55                         CHECKBOX_SetText(hItem, ttEnable[ttEnableOpt1]);
 56                     }
 57                     
 58                     // USER END
 59                     break;
 60                 // USER START (Optionally insert additional code for further notification handling)
 61                 // USER END
 62             }
 63             break;
 64         case ID_CHECKBOX_1: // Notifications sent by 'opt2-Checkbox'
 65             switch(NCode) {
 66                 case WM_NOTIFICATION_CLICKED:
 67                     // USER START (Optionally insert code for reacting on notification message)
 68                     // USER END
 69                     break;
 70                 case WM_NOTIFICATION_RELEASED:
 71                     // USER START (Optionally insert code for reacting on notification message)
 72                     // USER END
 73                     break;
 74                 case WM_NOTIFICATION_VALUE_CHANGED:
 75                     // USER START (Optionally insert code for reacting on notification message)
 76                 　　 // --⑥
 77                     if(1 == initFlag)
 78                     {
 79                         ttEnableOpt2 = !ttEnableOpt2;
 80                         hItem = WM_GetDialogItem(pMsg->hWin, ID_CHECKBOX_1);
 81                         CHECKBOX_SetText(hItem, ttEnable[ttEnableOpt2]);
 82                     }
 83                 
 84                     // USER END
 85                     break;
 86                 // USER START (Optionally insert additional code for further notification handling)
 87                 // USER END
 88             }
 89             break;
 90         case ID_CHECKBOX_2: // Notifications sent by 'opt3-Checkbox'
 91             switch(NCode) {
 92                 case WM_NOTIFICATION_CLICKED:
 93                     // USER START (Optionally insert code for reacting on notification message)
 94                     // USER END
 95                     break;
 96                 case WM_NOTIFICATION_RELEASED:
 97                     // USER START (Optionally insert code for reacting on notification message)
 98                     // USER END
 99                     break;
100                 case WM_NOTIFICATION_VALUE_CHANGED:
101                     // USER START (Optionally insert code for reacting on notification message)
102                 　　 // --⑦
103                     if(1 == initFlag)
104                     {
105                         ttEnableOpt3 = !ttEnableOpt3;
106                         hItem = WM_GetDialogItem(pMsg->hWin, ID_CHECKBOX_2);
107                         CHECKBOX_SetText(hItem, ttEnable[ttEnableOpt3]);
108                     }
109                     
110                     // USER END
111                     break;
112                 // USER START (Optionally insert additional code for further notification handling)
113                 // USER END
114             }
115             break;
116         // USER START (Optionally insert additional code for further Ids)      
117         // USER END
118     }
119     break;