using System;
using System.Collections.Generic;
using System.Text;

namespace Shared.Phone.UserCenter
{
    /// <summary>
    /// 做成一个上下可以滑动的列表控件(它会调整高度,无桌布)
    /// </summary>
    public class VerticalListControl : VerticalScrolViewLayout
    {
        #region ■ 变量声明___________________________

        /// <summary>
        /// 行之间的间距
        /// </summary>
        public int rowSpace = 0;
        /// <summary>
        /// 最大高度
        /// </summary>
        private int maxHeight = -1;
        /// <summary>
        /// 一个没什么用的东西
        /// </summary>
        private FrameLayout frameBackTemp = null;

        #endregion

        #region ■ 初始化_____________________________

        /// <summary>
        /// 做成一个上下可以滑动的列表控件(它会调整高度,无桌布)
        /// </summary>
        /// <param name="i_rowSpace">行之间的间距(这个值是与行控件绑定一起使用的)</param>
        public VerticalListControl(int i_rowSpace = 0)
        {
            rowSpace = Application.GetRealHeight(i_rowSpace);
        }

        #endregion

        #region ■ 添加子控件_________________________

        /// <summary>
        /// 添加子控件(FrameRowControl,RowLayoutControl会改变高度)
        /// </summary>
        /// <param name="view"></param>
        public override void AddChidren(View view)
        {
            base.AddChidren(view);
            if (view is FrameRowControl || view is RowLayoutControl)
            {
                if (rowSpace > 0)
                {
                    view.Height += rowSpace;
                }
            }
            if (maxHeight == -1)
            {
                maxHeight = this.Height;
            }
        }
        #endregion

        #region ■ 调整真实高度_______________________

        /// <summary>
        /// 还原高度
        /// </summary>
        public void RecoverHeight()
        {
            if (this.maxHeight != -1)
            {
                this.Height = this.maxHeight;
            }
        }

        /// <summary>
        /// 调整控件真实高度(只针对行控件都是相同高度的,高度只会减少,不会增加)
        /// </summary>
        /// <param name="bottomSpace">底部空白间距(真实值)</param>
        /// <param name="addSpace">当真实高度超过原有高度时,是否添加空白</param>
        public void AdjustRealHeight(int bottomSpace, bool addSpace = true)
        {
            int count = frameBackTemp == null ? this.ChildrenCount : this.ChildrenCount - 1;
            if (count <= 0)
            {
                frameBackTemp?.RemoveFromParent();
                frameBackTemp = null;
                if (maxHeight != -1)
                {
                    //还原为最大高度
                    this.Height = maxHeight;
                }
                return;
            }

            //调整列表控件的高度
            var realHeight = count * this.GetChildren(0).Height + bottomSpace;
            if (realHeight < this.Height)
            {
                frameBackTemp?.RemoveFromParent();
                frameBackTemp = null;
                //缩小控件高度
                this.Height = realHeight;
            }
            else if (addSpace == true && bottomSpace > 0 && realHeight > this.maxHeight)
            {
                frameBackTemp?.RemoveFromParent();

                frameBackTemp = new FrameLayout();
                frameBackTemp.Height = bottomSpace;
                this.AddChidren(frameBackTemp);
            }
        }

        #endregion
    }
}