animated_drop_down_form_field 0.0.1

Simple package creates built-in and customizable animations to drop down buttons, You can also validate the user input, close the list and open the list programmatically using custom controller.

Animated_Drop_Down_Form_Field

This package provides awesome drop down buttons with built-in and customizable animation and many attributes to create professional user interface.

I have already made a video to explain all details of this package on Youtube

Usage

This package provides many attributes to give you the ability to create fully customized DropDownFormField. So to cover all of them let's break them down into 5 Categories :

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####1- Requierd Attributes: There is only one requierd attribute which called items, And these items are list of widgets will be displayed to the user.

    AnimatedDropDownFormFormField(
        items:[
            Text("Item 1"),
            Text("Item 2"),
            Text("Item 3"),
            Text("Item 4"),
        ],
    );

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####2- Button Attributes: These attributes give you the ability to control the button widget and they are 5 attributes :

• buttonDecoration:

  It's a BoxDecoration object to fully control the button decoration.

  AnimatedDropDownFormFormField(
      items:_items,
      buttonDecoration:BoxDecoration(color:Colors.blueAccent,),
  );
  

• buttonPadding:

  To provide some padding from edges to the content of button.

  AnimatedDropDownFormFormField(
      items:_items,
      buttonPadding: EdgeInsets.all(20),
  );
  

• placeHolder:

  It's a widget displayed in the button if the user didn't select any item yet.

  AnimatedDropDownFormFormField(
      items:_items,
      placeHolder: Text("No Data"),
  );
  

• actionWidget:

  This is the icon (widget) which displayed on the end of the dropDownButton.

  AnimatedDropDownFormFormField(
      items:_items,
      actionWidget: Icon(Icons.arrow_drop_down),
  );
  

• onTapButton:

  It's a void call back and will be executed when the user tap the button.

  AnimatedDropDownFormFormField(
      items:_items,
      onTapButton:(){
  
          //Will be excuted when the user tap the button 
      },
  );
  

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####3- Drop Down List Attributes: These attributes designed to control the drop down list, They are 9 attributes, So let's figure out each one of them...

• listHeight:

  To control the height of the dropDownList.

  AnimatedDropDownFormFormField(
      items:_items,
      listHeight: 150,
  );
  

• listBackgroundDecoration:

  This is a BoxDecoration object to control the list decoration.

  AnimatedDropDownFormFormField(
      items:_items,
      listBackgroundDecoration: BoxDecoration(color:Colors.blueAccent,),
  );
  

• listPadding:

  Apply padding to list content.

  AnimatedDropDownFormFormField(
      items:_items,
      listPadding: EdgeInsets.all(20),
  );
  

• listScrollPhysics:

  Control the type of scrolling physics at drop down list

  AnimatedDropDownFormFormField(
      items:_items,
      listScrollPhysics: BouncingScrollPhysics(),
  );
  

• separatorWigdet:

  It's a widget appears between the items inside the list.

  AnimatedDropDownFormFormField(
      items:_items,
      separatorWigdet:SizedBox(height: 15),
  );
  

• selectedItemIcon:

  It's the icon (widget) which appears next to the selected item at the list.

  AnimatedDropDownFormFormField(
      items:_items,
      selectedItemIcon:Icon(Icons.done_rounded),
  );
  

• onChangeSelectedIndex:

  It's a function gives you the currently selected item index at items list and will be executed when the user changes the selected item

  AnimatedDropDownFormFormField(
      items:_items,
      onChangeSelectedIndex: (int index){
          print(" Item At Index ${index} Is Currently Selected");
      },
  );
  

• onChangeListState:

  This is also a function gives you the current state of the list (Closed / Opened) and will be executed when the list state changes

  AnimatedDropDownFormFormField(
      items:_items,
      onChangeListState: (bool listIsOpened){
          print("The Drop Down List Is Currently ${listIsOpened?"Opened":"Closed"}");
      },
  );
  

• dropDownAnimationParameters:

  This attribute gives you the abillity to control the opening and closing animation of the drop down list can take an object from one out of two classes:

  • SizingDropDownAnimationParameters.
  • ScalingDropDownAnimationParameters.

  At both of them you can control:

  • Duration (Duration of list opening)
  • Curve (Animation curve of list opening)
  • Reverse duration (Duration of list closure)
  • ReverseCurve (Animation curve of list closure)

  But the difference between them is that:

  • At scaling you can control the centerOfScaling attribute which is AlignmentGeometry object to control from which point the scaling will start and stop.

    AnimatedDropDownFormFormField(
        items:_items,
        dropDownAnimationParameters: ScalingDropDownAnimationParameters(
            centerOfScaling:Alignment.topCenter,
            reverseDuration:Duration(seconds:2),
            reverseCurve:Curves.linear,
        ),
    );
    

  • On the other hand at sizing you can control the axis of sizing (can be horizontal or vertical)

    AnimatedDropDownFormFormField(
        items:_items,
        dropDownAnimationParameters:SizingDropDownAnimationParameters(
            axis:Axis.vertical,
            duration:Duration(seconds:2),
            curve:Curves.linear,
        ),
    );
    

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####4- General Attributes: we have 3 Attributes at this category.

• defultTextStyle :

  This TextStyle object will be applied on any Text doesn't has style

  AnimatedDropDownFormFormField(
      items:_items,
      defultTextStyle: TextStyle(color:Colors.grey),
  );
  

• distanceBetweenListAndButton:

  Here you can specify the distance between the button and the dropDown list

  AnimatedDropDownFormFormField(
      items:_items,
      distanceBetweenListAndButton: 10,
  );
  

• controller:

  This requires object from type AnimatedDropDownFormFieldController.

  AnimatedDropDownFormFieldController _controller= AnimatedDropDownFormFieldController();
  AnimatedDropDownFormFormField(
      items:_items,
      controller: _controller,
  );
  

  This controller provides 3 control functions on the AnimatedDropDownFormField widget:
  1. Open list programmatically

     ElevatedButton(
         onPressed: (){
             _controller.openList();
         }, 
         child: const Text("Open The List"),
     );
     

  2. Close list programmatically

     ElevatedButton(
         onPressed: (){
             _controller.closeList();
         }, 
         child: const Text("Close The List"),
     );
     

  3. Validate the user input

     ElevatedButton(
         onPressed: (){
             _controller.validate();
         }, 
         child: const Text("Validate Input"),
     );
     

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####5- Error Attributes: This category also contains 3 Attributes and they are responsible for handling the not valid input state from user and we have:

• errorWidget :

  It's a widget displayed below the button if the validation failed

  AnimatedDropDownFormFormField(
      items:_items,
      errorWidget: Text("Not Valid Input"),
  );
  

• errorTextStyle:

  Any text inside the errorWidget has no TextStyle will take this textStyle

  AnimatedDropDownFormFormField(
      items:_items,
      errorTextStyle: TextStyle(color:Colors.red),
  );
  

• errorBorder:

  It's a Border object and will rounded the button if the validate method called and the input was not valid.

  AnimatedDropDownFormFormField(
      items:_items,
      errorBorder: Border.all(color:Colors.red),
  );
  

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