【emwin】点击窗口的无效部分来实现一些功能

@2018-07-27

触摸屏幕窗口的无效部分实现 Dropdown 部件的折叠操作

> 具体代码

case WM_TOUCH:
    if (pMsg->Data.p) // Something happened in our area (pressed or released)
    {  
        const GUI_PID_STATE* pState;
        pState = (const GUI_PID_STATE*)pMsg->Data.p;
            
        if (pState->Pressed) 
        {
            if (WM_GetFocussedWindow() != pMsg->hWin) 
            {        
                hItem = WM_GetDialogItem(pMsg->hWin, ID_DROPDOWN_0);
                    
                if(0 != DROPDOWN_GetListbox(hItem))
                {
                    DROPDOWN_Collapse(hItem);
                }
                    
                hItem = WM_GetDialogItem(pMsg->hWin, ID_DROPDOWN_1);
                    
                if(0 != DROPDOWN_GetListbox(hItem))
                {
                    DROPDOWN_Collapse(hItem);
                }
                    
                hItem = WM_GetDialogItem(pMsg->hWin, ID_DROPDOWN_2);
                    
                if(0 != DROPDOWN_GetListbox(hItem))
                {
                    DROPDOWN_Collapse(hItem);
                }                    
            }
        }
    }            
    break;