1、 MApp_Main.c里有个while(1)循环；
2、 通过 while(1)循环MApp_MultiTasks 里面的 MApp_ProcessUserInput 可以 得到 当前的 u8KeyCode
3、 while(1)循环 里面的MApp_TopStateMachine的作用：
3.1、在刚开机时，首先 enTopState = STATE_TOP_DIGITALINPUTS 等待用户输入;
3.2、再次调用：MApp_TopStateMachine时，switch ( enTopState ) 之后调用 switch （MApp_TV） ;
3.3、当用户在IR中输入Menu按键;
3.4、通过MApp_TV调用MApp_TV_ProcessUserInput 之后
switch ( u8KeyCode )
case KEY_MENU:
enTVState = STATE_TV_INIT;
enTVRetVal = EXIT_GOTO_MENU;
u8KeyCode = KEY_NULL;
break;
switch(MApp_TV())
case EXIT_GOTO_MENU:
enTopState = STATE_TOP_MENU;
break;
3.5、再次调用：MApp_TopStateMachine时，witch ( enTopState ) 之后调用 switch(MApp_Menu_Main()) ;
3.6、通过MApp_Menu_Main调用MApp_ZUI_ACT_StartupOSD(E_OSD_MAIN_MENU);再调用MApp_ZUI_ACT_AppShowMainMenu();就可以Show出我们想要Show出的主界面了。
enMainMenuState = STATE_MENU_WAIT;
_eZUIState = E_ZUI_STATE_RUNNING;
3.7、再次调用MApp_Menu_Main时，switch(enMainMenuState)时，就要执行：
MApp_ZUI_ProcessKey(u8KeyCode);
u8KeyCode = KEY_NULL;
MApp_ZUI_ACT_ExecuteWndAction(EN_EXE_UPDATE_SIGNAL_INFORMAT);
了；
3.8、MApp_ZUI_ProcessKey调用MApp_ZUI_API_PostMessage(HWND_MAINFRAME, MSG_KEYDOWN, vk_code)，Post Message。
3.9、再次调用MApp_TopStateMachine 时执行到 MApp_ZUI_MainTask 时
switch (_eZUIState) eZUIState等于了E_ZUI_STATE_RUNNING,就会调用MApp_ZUI_API_GetMessage(&msg)收到刚才MApp_ZUI_ProcessKey发过来的Message，再通过MApp_ZUI_API_DispatchMessage (&msg);因为我们刚才发的是key的Message所以，执行的以下代码：
if (pMsg->message == MSG_KEYDOWN)
{
//printf(“[dispmsg1]\n”);
if (_eZUIState == E_ZUI_STATE_RUNNING /*||
_eZUIState == E_ZUI_STATE_MSGBOX_DOMODAL*/)
{
if (!MApp_ZUI_ACT_HandleGlobalKey((VIRTUAL_KEY_CODE)pMsg->wParam))
{
focus = GETWNDFOCUS();
//printf(“/focus=%bu\n”, (U8)focus);
//printf(“[dispmsg2]\n”);
if (HWND_INVALID != focus)
{
pMsg->hwnd = focus; //2007/12/24: keydown message for focus
iRet = MApp_ZUI_ACT_ExecuteWndProc(GETWNDPROCID(focus), pMsg);
}
}
}
#if ZUI_DBG_RECURSIVE
_bInDispatchMessage = 0;
#endif //ZUI_DBG_RECURSIVE
return iRet;
}
3.10、由focus = GETWNDFOCUS();得到当前Win的Focus
3.11、MApp_ZUI_ACT_ExecuteWndProc(GETWNDPROCID(focus), pMsg)两个参数的说明：
GETWNDPROCID(focus)，得到当前Win的类型（有EN_ZUI_DEFAULTWINPROC、EN_ZUI_FLIPPAGE_WINPROC、EN_ZUI_EFFECT_WINPROC等类型）
pMsg：收到的消息，在本例中收到是按键。
3.12、执行到S32 MApp_ZUI_ACT_ExecuteWndProc(U8 u8WinProcID, PMSG msg)，根据传过来的参数，执行：EFFECT_WINPROC(msg->hwnd, msg);直接调用：return DEFAULTWINPROC(hWnd, pMsg);
3.13、转到执行：MApp_ZUI_API_DefaultWindowProc
本例会执行以下语句：
if (GETWNDKEYEVENT(focus))
{
KEYEVENT *keyevent;
keyevent = GETWNDKEYEVENT(focus);
while (keyevent->u16VirKey != VK_NULL)
{
if (keyevent->u16VirKey == pMsg->wParam)
{
handled = MApp_ZUI_ACT_ExecuteWndAction(keyevent->u16ExeActID);
//we can allow multiple actions… depend on the last one action..
}
keyevent++;
}
对这段代码的理解，由GETWNDKEYEVENT(focus)得到当前focus定义的keyevent，如果有定义当前所按键的事件if (keyevent->u16VirKey == pMsg->wParam)则MApp_ZUI_ACT_ExecuteWndAction(keyevent->u16ExeActID);将定义要执行的事件ID传过去。
For example:
static KEYEVENT _ZUI_TBLSEG _MENU_PICTURE_MODE_KEY[] =
{
{ VK_SELECT, EN_EXE_GOTO_PICTURE_MODE_PAGE},
{ VK_UP, EN_EXE_NOTIFY_PARENT_KEY_UP },
{ VK_DOWN, EN_EXE_NOTIFY_PARENT_KEY_DOWN },
{ VK_UP, EN_EXE_EFFECT_SLIDEITEM },
{ VK_DOWN, EN_EXE_EFFECT_SLIDEITEM },
{ VK_LEFT , EN_EXE_EFFECT_FLIPPAGE_LEFT },
{ VK_RIGHT , EN_EXE_EFFECT_FLIPPAGE_RIGHT },
{ VK_NULL, 0 },
};
3.14、执行到：MApp_ZUI_ACT_ExecuteWndAction
本例只执行：switch(_eActiveOSD)段。当前是E_OSD_MAIN_MENU所以执行MApp_ZUI_ACT_ExecuteMainMenuAction(act);
3.15、以按左右键为例：
switch(act)
case EN_EXE_EFFECT_FLIPPAGE_LEFT:
case EN_EXE_EFFECT_FLIPPAGE_RIGHT:
{
static HWND hwndTop[] =
{
HWND_MENU_CHANNEL_PAGE,
HWND_MENU_PICTURE_PAGE,
HWND_MENU_SOUND_PAGE,
HWND_MENU_TIME_PAGE,
HWND_MENU_OPTION_PAGE,
#if SHOW_LIUBO_ADD_TEST_PAGE
HWND_MENU_TEST_PAGE,
#endif
#if ENABLE_ATV_VCHIP//ENABLE_DTV
HWND_MENU_LOCK_PAGE,
#endif
#if (INPUT_USB_SOURCE == 0)
HWND_MENU_APP_PAGE,
#endif
};
HWND hwndFocus = MApp_ZUI_API_GetFocus();
HWND hwndEffect = hwndFocus;
HWND hwndNext = HWND_INVALID;
EN_FLIPPAGE dir = EN_FLIPPAGE_NONE;
/******若当前不是第0个Index page则 要找到当前功能的首个page 即属性为EN_ZUI_FLIPPAGE_WINPROC的page**************/
while((hwndEffect=MApp_ZUI_API_GetParent(hwndEffect))!= HWND_MAINFRAME )
{
if ( MApp_ZUI_API_GetWindowProcId(hwndEffect) == EN_ZUI_FLIPPAGE_WINPROC )
{
break;
}
}
/******若当前不是第0个Index page则 要找到当前功能的首个page 即属性为EN_ZUI_FLIPPAGE_WINPROC的page**************/
if ( hwndEffect == HWND_MAINFRAME )
return TRUE;
U32 u32Data = MApp_ZUI_API_GetWindowData(hwndEffect);
if ( u32Data == 0 )
return TRUE;
U32 i;
for (i=0; i<countof(hwndtop); i++)="" {="" if="" (="" hwndtop[i]="=" hwndeffect="" )="" break;="" }="" i="">= COUNTOF(hwndTop) )
return TRUE;
if (act == EN_EXE_EFFECT_FLIPPAGE_LEFT)
{
if ( i < 1 ) i = COUNTOF(hwndTop) - 1; #if ENABLE_DTV else if((hwndTop[i]==HWND_MENU_APP_PAGE)&&(!IsDTVInUse())) i-=2; #endif else i--; hwndNext = hwndTop[i]; dir = EN_FLIPPAGE_LEFT; } else if (act == EN_EXE_EFFECT_FLIPPAGE_RIGHT) { if ( i+1 >= COUNTOF(hwndTop) )
i = 0;
#if ENABLE_DTV
else if((hwndTop[i]==HWND_MENU_OPTION_PAGE)&&(!IsDTVInUse()))
i+=2;
#endif
else
i++;
hwndNext = hwndTop[i];
dir = EN_FLIPPAGE_RIGHT;
}
HWND child, last_succ; //2008/4/12: get last successor once
HWND listwn = hwndNext+2;
last_succ = MApp_ZUI_API_GetLastSuccessor(listwn);
for (child = listwn+1; child <= last_succ; child++) { if (MApp_ZUI_API_GetParent(child) != listwn) continue; if (MApp_ZUI_ACT_QueryDynamicListItemStatus(child) != EN_DL_STATE_NORMAL) 这个if语句的作用是：设置下个页面不要显示的win。 continue; else break; } GUI_DATA_FLIPPAGE *windata = (GUI_DATA_FLIPPAGE *) u32Data; windata->pVarData->hwndCurrent = hwndEffect;
windata->pVarData->hwndNext = hwndNext;
/*
if(windata->pVarData->hwndNext == HWND_MENU_LOCK_PAGE)
{ // if focus on HWND_MENU_LOCK_PAGE, set focus on HWND_MENU_LOCK_TITLE
// Press Enter to invoke input password dialog and to input password to use HWND_MENU_LOCK_PAGE’s functions.
child = windata->pVarData->hwndNext +1;
}
*/
#if ENABLE_DTV
if(windata->pVarData->hwndNext == HWND_MENU_LOCK_PAGE)
stGenSetting.g_BlockSysSetting.u8EnterLockPage = 0;
#endif
if(child == last_succ)
windata->pVarData->hwndNextFocus = windata->pVarData->hwndNext+3;
else
windata->pVarData->hwndNextFocus = child;
windata->pVarData->dir = dir;
//MApp_ZUI_API_PostMessage(windata->pVarData->hwndCurrent, MSG_EFFECT, 0);
MApp_ZUI_API_SendMessage(windata->pVarData->hwndCurrent, MSG_EFFECT, 0);
MApp_ZUI_API_InvalidateWindow(HWND_MENU_MAIN_BOTTON_INFO_BAR);
return TRUE;
