gzx_dropdown_menu :  ^ three point one . zero

 //Drop down menu header
 GZXDropDownHeader ( //Drop down header items. At present, each item can only customize the displayed text, icon and icon size items : [ GZXDropDownHeaderItem (_dropDownHeaderItemStrings[ zero ]), GZXDropDownHeaderItem ( _dropDownHeaderItemStrings[ one ], iconData :  Icons .keyboard_arrow_down, iconDropDownData :  Icons .keyboard_arrow_up, ), GZXDropDownHeaderItem ( _dropDownHeaderItemStrings[ two ], style :  TextStyle (color :  Colors .green), iconData :  Icons .arrow_upward, iconDropDownData :  Icons .arrow_downward, ), GZXDropDownHeaderItem ( _dropDownHeaderItemStrings[ three ], iconData :  Icons .filter_frames, iconSize :  eighteen , ), ], //GZXDropDownHeader corresponds to the key of the first parent stack stackKey : _stackKey, //The controller is used to control the display or hiding of the menu controller : _dropdownMenuController, //When clicking the event of the header item, page jump or openEndDrawer can be performed here onItemTap : (index) { if (index ==  three ) { _dropdownMenuController. hide (); _scaffoldKey.currentState ! . openEndDrawer (); } }, //Height of head height :  forty , //Head background color color :  Colors .red, //Head border width borderWidth :  one , //Head border color borderColor :  Color ( 0xFFeeede6 ), //Division line height dividerHeight :  twenty , //Split line color dividerColor :  Color ( 0xFFeeede6 ), //Text Style style :  TextStyle (color :  Color ( 0xFF666666 ), fontSize :  fourteen ), //Drop Down Text Style dropDownStyle :  TextStyle ( fontSize :  fourteen , color :  Theme . of (context).primaryColor, ), //Icon size iconSize :  twenty , //Icon Color iconColor :  Color ( 0xFFafada7 ), //Icon color when pulling down iconDropDownColor :  Theme . of (context).primaryColor, ),

 //Pull down menu. Note that GZXDropDownMenu can only be in Stack at present. It will be improved later when time comes. It also supports CustomScrollView and NestedScrollView
 GZXDropDownMenu ( //The controller is used to control the display or hiding of the menu controller : _dropdownMenuController, //Drop down menu to show or hide animation duration animationMilliseconds :  three hundred , //Mask color after pull-down
   //maskColor: Theme.of(context).primaryColor.withOpacity(0.5),
   //maskColor: Colors.red.withOpacity(0.5), dropdownMenuChanging : (isShow, index) { setState (() { _dropdownMenuChange =  '(in progress${ isShow ? 'Display' : 'Hide' }$ index )' ; print (_dropdownMenuChange); }); }, dropdownMenuChanged : (isShow, index) { setState (() { _dropdownMenuChange =  '(already${ isShow ? 'Display' : 'Hide' }$ index )' ; print (_dropdownMenuChange); }); }, //Drop down menu is highly customized. You can display whatever you want, which is completely up to you. You just need to call _dropdownMenuController. hide() after selecting; that will do menus : [ GZXDropdownMenuBuilder ( dropDownHeight :  forty  *  eight , dropDownWidget :  _buildAddressWidget ((selectValue) { _dropDownHeaderItemStrings[ zero ] = selectValue; _dropdownMenuController. hide (); setState (() {}); })), GZXDropdownMenuBuilder ( dropDownHeight :  forty  *  eight , dropDownWidget :  _buildConditionListWidget (_brandSortConditions, (value) { _selectBrandSortCondition = value; _dropDownHeaderItemStrings[ one ] = _selectBrandSortCondition.name ==  'All'  ?  'Brand'  : _selectBrandSortCondition.name; _dropdownMenuController. hide (); setState (() {}); })), GZXDropdownMenuBuilder ( dropDownHeight :  forty  * _distanceSortConditions.length, dropDownWidget :  _buildConditionListWidget (_distanceSortConditions, (value) { _selectDistanceSortCondition = value; _dropDownHeaderItemStrings[ two ] = _selectDistanceSortCondition.name; _dropdownMenuController. hide (); setState (() {}); })), ], ),