SwipeToDeleteCallback.java

SwipeToDeleteCallback.java

/**
 * Created by Ryo on 2018/03/06.
 */

public abstract class SwipeToDeleteCallback extends ItemTouchHelper.SimpleCallback {

    private ColorDrawable mBackgroundColorDrawable = new ColorDrawable();
    private Drawable mSwipeBackIcon;

    public SwipeToDeleteCallback(@NonNull Drawable swipeIcon, @ColorInt int swipeBackgroundColor) {
        super(0, ItemTouchHelper.LEFT);
        mSwipeBackIcon = swipeIcon;
        mBackgroundColorDrawable.setColor(swipeBackgroundColor);
    }

    @Override
    public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
        View itemView = viewHolder.itemView;
        int itemViewHeight = itemView.getBottom() - itemView.getTop();
        mBackgroundColorDrawable.setBounds(
                itemView.getRight() + ((int) dX),
                itemView.getTop(),
                itemView.getRight(),
                itemView.getBottom()
        );
        mBackgroundColorDrawable.draw(c);

        int top = itemView.getTop() + (itemViewHeight - mSwipeBackIcon.getIntrinsicHeight()) / 2;
        int deleteIconMargin = (itemViewHeight - mSwipeBackIcon.getIntrinsicHeight()) / 2;
        int left = itemView.getRight() - deleteIconMargin - mSwipeBackIcon.getIntrinsicWidth();
        int right = itemView.getRight() - deleteIconMargin;
        int bottom = top + mSwipeBackIcon.getIntrinsicHeight();

        mSwipeBackIcon.setBounds(left, top, right, bottom);
        mSwipeBackIcon.draw(c);

        super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
    }

    @Override
    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
        return false;
    }
}