using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using ryCommon;

namespace ryControls
{
    /// <summary>
    /// 多标签控件
    /// </summary>
    [DefaultEvent("SelectedIndexChanged")]
    [Description("多标签控件")]
    public partial class TabBar : UserControl
    {
        /// <summary>
        /// 
        /// </summary>
        public TabBar()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 选项发生变化时激发
        /// </summary>
        [Description("选项发生变化时")]
        public event EventHandler SelectedIndexChanged;
        private int _SelectedIndex = 0;
        /// <summary>
        /// 标签选择的序号
        /// </summary>
        public int SelectedIndex
        {
            get { return _SelectedIndex; }
            set
            {
                if (_SelectedIndex != value)
                {
                    _SelectedIndex = value;
                    if (TabControlEx != null)
                    {
                        if (TabControlEx.TabCount > value)
                        {
                            TabControlEx.SelectedIndex = value;
                        }
                    }
                    else
                    {
                        for (int m = 0; m < list_ctl.Count; m++)
                        {
                            Label lbl2 = list_ctl[m];
                            if (m == value)
                            {
                                lbl2.ForeColor = Selected_Color;
                                PicTabSelect.Left = lbl2.Left;
                                PicTabSelect.Top = this.Height - PicTabSelect.Height;
                                PicTabSelect.BringToFront();
                                PicTabSelect.Width = lbl2.Width;
                            }
                            else
                            {
                                lbl2.ForeColor = this.ForeColor;
                            }
                        }
                        SelectedIndexChanged?.Invoke(this, new EventArgs());
                    }
                }
            }
        }
        private string _tab_list = "";
        /// <summary>
        /// 
        /// </summary>
        public string TabList
        {
            get { return _tab_list; }
            set { _tab_list = value; ReDraw(); }
        }
        private Color _Selected_Color = Color.RoyalBlue;
        /// <summary>
        /// 选择的颜色
        /// </summary>
        public Color Selected_Color
        {
            get { return _Selected_Color; }
            set { _Selected_Color = value; ReDraw(); }
        }
        private Color _TabControl_Color = Color.FromArgb(233, 233, 233);
        /// <summary>
        /// 多标签控件颜色
        /// </summary>
        public Color TabControl_Color
        {
            get { return _TabControl_Color; }
            set {
                _TabControl_Color = value;
                if (TabControlEx != null)
                {
                    TabControlEx.TabBackColor = TabControl_Color;
                    for (int i = 0; i < TabControlEx.TabCount; i++)
                    {
                        TabControlEx.TabPages[i].BackColor = TabControl_Color;
                    }
                }
            }
        } 
        private TabControlEx tabControlEx;
        /// <summary>
        /// 
        /// </summary>
        public TabControlEx TabControlEx
        {
            get
            {
                return this.tabControlEx;
            }
            set
            {
                if (this.tabControlEx != value)
                {
                    if (this.tabControlEx != null)
                    {
                        this.tabControlEx.SelectedIndexChanged -= TabControlEx_SelectedIndexChanged;
                    }
                    if (this.tabControlEx != null && this.tabControlEx.TabBar == this)
                    {
                        this.tabControlEx.InternalTabBar = null;
                    }
                    this.tabControlEx = value;
                    if (value != null)
                    {
                        value.InternalTabBar = this;
                        value.SelectedIndexChanged += TabControlEx_SelectedIndexChanged;
                        value.BringToFront();
                        value.TabBackground = null;
                        value.ItemSize = new Size(0, 1);
                        value.TabBackColor = TabControl_Color;
                        for (int i = 0; i < value.TabCount; i++)
                        {
                            value.TabPages[i].BackColor = TabControl_Color;
                        }
                        value.Location = new Point(this.Left, this.Top + this.Height);
                    }
                }
            }
        }
        private void TabControlEx_SelectedIndexChanged(object o, EventArgs e)
        {
            TabControlEx tab = (TabControlEx)o;
            for (int m = 0; m < list_ctl.Count; m++)
            {
                Label lbl2 = list_ctl[m];
                if (m == tab.SelectedIndex)
                {
                    lbl2.ForeColor = Selected_Color;
                    PicTabSelect.Left = lbl2.Left;
                    PicTabSelect.Top = this.Height - PicTabSelect.Height;
                    PicTabSelect.BringToFront();
                    PicTabSelect.Width = lbl2.Width;
                }
                else
                {
                    lbl2.ForeColor = this.ForeColor;
                }
            }
            _SelectedIndex = tab.SelectedIndex;
            SelectedIndexChanged?.Invoke(this, new EventArgs());
        }
        private List<Label> list_ctl = new List<Label>();
        private void ReDraw()
        {
            for (int i =this.Controls.Count-1; i>0; i--)
            {
                switch (this.Controls[i])
                {
                    case Label lbl:
                        this.Controls.Remove(lbl);
                        break;
                }
            }
            list_ctl.Clear();
            string[] item = _tab_list.Split('|');
            int lbl_left = 0;
            Graphics gh = this.CreateGraphics();
            for (int i = 0; i < item.Length; i++)
            {
                Label _lbl = new Label
                {
                    Parent = this,
                    Text = item[i],
                    AutoSize = false,
                    Height = this.Height
                };
                SizeF sf = gh.MeasureString(item[i], _lbl.Font);
                _lbl.Width = (int)sf.Width+8;
                //_lbl.Width = 60;
                _lbl.Left = lbl_left;
                lbl_left += _lbl.Width;
                _lbl.TextAlign = ContentAlignment.MiddleCenter;
                _lbl.Visible = true;
                _lbl.ForeColor = this.ForeColor;
                _lbl.Tag = i;
                list_ctl.Add(_lbl);
                if (i == 0)
                {
                    _lbl.ForeColor = Selected_Color;
                    PicTabSelect.Left = _lbl.Left;
                    PicTabSelect.Top = this.Height- PicTabSelect.Height;
                    PicTabSelect.BringToFront();
                    PicTabSelect.Width = _lbl.Width;
                }
                _lbl.Click += new EventHandler((object o, EventArgs e2) =>
                {
                    int tag = _lbl.Tag.ToInt();
                    Label lbl = (Label)o;
                    if (TabControlEx == null)
                    {
                        for (int m = 0; m < list_ctl.Count; m++)
                        {
                            if(list_ctl[m]== lbl)
                            {
                                lbl.ForeColor = Selected_Color;
                                PicTabSelect.Left = lbl.Left;
                                PicTabSelect.Top = this.Height - PicTabSelect.Height;
                                PicTabSelect.BringToFront();
                                PicTabSelect.Width = lbl.Width;
                                _SelectedIndex = m;
                                SelectedIndexChanged?.Invoke(this, new EventArgs());
                            }
                            else
                            {
                                list_ctl[m].ForeColor = this.ForeColor;
                            }
                        }
                        return;
                    }
                    if (tag.IsInRange(0, TabControlEx.TabCount))
                    {
                        TabControlEx.SelectedIndex = tag;
                    }
                });
            }
        }

        private void TabBar_ForeColorChanged(object sender, EventArgs e)
        {
            ReDraw();
        }

        private void TabBar_SizeChanged(object sender, EventArgs e)
        {
            ReDraw();
        }
    }
}