long_press_draggable_gridview

This package supports drag & drop widgets inside the GridView.builder for multiplatform. It provides all the properties which are available in Gridview.builder and easy to implement with the few lines of code.

This project is based on modifying the problem that only one gridview can exist at the same time, and adding support for CustomScrollView

Draggable GridView.

Usage

Example

      DraggableGridViewBuilder(
        gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
          crossAxisCount: 2,
          childAspectRatio: MediaQuery.of(context).size.width / (MediaQuery.of(context).size.height / 3),
        ),
        children: _listOfDraggableGridItem,
        isOnlyLongPress: false,
        dragCompletion: (List<DraggableGridItem> list, int beforeIndex, int afterIndex) {
          print( 'onDragAccept: $beforeIndex -> $afterIndex');
        },
        dragFeedback: (List<DraggableGridItem> list, int index) {
          return Container(
            child: list[index].child,
            width: 200,
            height: 150,
          );
        },
        dragPlaceHolder: (List<DraggableGridItem> list, int index) {
          return PlaceHolderWidget(
            child: Container(
              color: Colors.white,
            ),
          );
        },
      );

Required parameters

gridDelegate:

A delegate that controls the layout of the children within the GridView.

children:

This property contains list of [DraggableGridItem] and it is use to show the widget inside the GridView.builder to provide the drag & drop functionality. Also, it contains isDraggable parameter which manages enable/disable the drag & drop functionality.

dragCompletion:

This callback provides updated list and old and new indexes.

Optional parameters

dragFeedback:

With this callback, you have to return a Widget and we will use this widget in feedback. Learn more about feedback from Draggable class.

dragPlaceHolder:

TWith this callback, you have to return a PlaceHolderWidget and we will use this widget in place holder.

dragChildWhenDragging:

With this callback, you have to return a Widget and we will display this widget instead of child when drags are under way. Learn more about childWhenDragging from Draggable class.

Last But Not Least 😍

You can use all the GridView.builder properties with DraggableGridViewBuilder class.

Note:

The result returns in List. so it can be lost later, you are responsible for storing it somewhere permanent (if needed).

Guideline for contributors

Contribution towards our repository is always welcome, we request contributors to create a pull request to the develop branch only.

Guideline to report an issue/feature request

It would be great for us if the reporter can share the below things to understand the root cause of the issue.

• Library version
• Code snippet
• Logs if applicable
• Device specification like (Manufacturer, OS version, etc)
• Screenshot/video with steps to reproduce the issue

LICENSE!

Flutter Draggable GridView is MIT-licensed.