/// <summary>
/// 标签鼠标边距感应触发拖移
/// 逻辑:可自定义 向左或向右拖放 感应边区宽度
/// 通用:是
/// 测试:正确
/// 使用:建议
/// 改进:有
///
/// 时间:202108122244-131150
/// 注:未对多行标签做特殊处理,在多行标签时可以将究使用
/// </summary>
public class TabMover2
{
    TabControl tc;
    TabPage clkTp, msTp;
    Rectangle clkRct, msRct;
    /// <summary>
    /// 触发边距
    /// </summary>
    int trgBdr = 20;
    int idx;
    /// <summary>
    ///
    /// </summary>
    /// <param name="tc"></param>
    public TabMover2(TabControl tc)
    {
        tc.MouseDown += _MouseDown;
        tc.MouseMove += _MouseMove;
        tc.MouseUp += _MouseUp;

        this.tc = tc;
    }
    public TabMover2(TabControl tc, int trgBdr)
    {
        tc.MouseDown += _MouseDown;
        tc.MouseMove += _MouseMove;
        tc.MouseUp += _MouseUp;

        this.tc = tc;
    }

    private void _MouseUp(object sender, MouseEventArgs e)
    {
        tc.Cursor = Cursors.Default;
    }

    private void _MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            clkTp = tc.SelectedTab;
            //idx = tc.TabPages.IndexOf(clkTp);
            //clkRct = tc.GetTabRect(idx);
        }
    }
    private void _MouseMove(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            tc.Cursor = Cursors.Hand;

            if (clkTp == null)
                return;

            F.Ctrs.TC.Tab.Mos(tc, e, out msTp);
            if (msTp == null)
                return;

            if (msTp == clkTp)
                return;

            idx = tc.TabPages.IndexOf(clkTp);
            clkRct = tc.GetTabRect(idx);

            idx = tc.TabPages.IndexOf(msTp);
            msRct = tc.GetTabRect(idx);

            if (msRct.Location.X > clkRct.Location.X)
            {
                if (e.X < msRct.Location.X + msRct.Width - trgBdr)
                    return;
            }
            else if (msRct.Location.X < clkRct.Location.X)
            {
                if (e.X > msRct.Location.X + trgBdr)
                    return;
            }

            tc.TabPages.Remove(clkTp);
            tc.TabPages.Insert(idx, clkTp);

            tc.SelectedTab = clkTp;
            msTp = clkTp;
        }
    }
}
/// <summary>
/// 标签鼠标边距感应触发拖移[触发感应区域为向左或向右 端点 以拖动]
/// 逻辑:可自定义 向左或向右拖放 感应边区宽度,且首先以被拖动标签宽度与自定义边区宽度作为对比得出实际需要的感应边区宽度
/// 通用:是
/// 测试:正确
/// 使用:[在未完全使用情况总结下] 推荐
/// 改进:可能有待
///
/// 时间:202108131044-1150
/// 注:未对多行标签做特殊处理,在多行标签时可以将究使用
/// </summary>
public class TabMover3
{
    TabControl tc;
    TabPage clkTp, msTp;
    Rectangle clkRct, msRct;
    /// <summary>
    /// 触发边距
    /// </summary>
    int trgBdr = 20, trgBdr_ = 20;
    int idx;
    /// <summary>
    ///
    /// </summary>
    /// <param name="tc"></param>
    public TabMover3(TabControl tc)
    {
        tc.MouseDown += _MouseDown;
        tc.MouseMove += _MouseMove;
        tc.MouseUp += _MouseUp;

        this.tc = tc;
    }
    public TabMover3(TabControl tc, int trgBdr)
    {
        tc.MouseDown += _MouseDown;
        tc.MouseMove += _MouseMove;
        tc.MouseUp += _MouseUp;

        this.tc = tc;
        this.trgBdr = trgBdr;
    }
    private void _MouseUp(object sender, MouseEventArgs e)
    {
        tc.Cursor = Cursors.Default;
    }

    private void _MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            clkTp = tc.SelectedTab;
        }
    }
    private void _MouseMove(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            tc.Cursor = Cursors.Hand;

            if (clkTp == null)
                return;

            F.Ctrs.TC.Tab.Mos(tc, e, out msTp);
            if (msTp == null)
                return;

            if (msTp == clkTp)
                return;

            idx = tc.TabPages.IndexOf(clkTp);
            clkRct = tc.GetTabRect(idx);

            idx = tc.TabPages.IndexOf(msTp);
            msRct = tc.GetTabRect(idx);

            if (msRct.Width > clkRct.Width)
            {
                if (trgBdr > clkRct.Width)
                    trgBdr_ = clkRct.Width;
                else
                    trgBdr_ = trgBdr;
            }
            else
                trgBdr_ = trgBdr;

            if (msRct.Location.X > clkRct.Location.X)
            {
                if (e.X < msRct.Location.X + msRct.Width - trgBdr_)
                    return;
            }
            else if (msRct.Location.X < clkRct.Location.X)
            {
                if (e.X > msRct.Location.X + trgBdr_)
                    return;
            }

            tc.TabPages.Remove(clkTp);
            tc.TabPages.Insert(idx, clkTp);

            tc.SelectedTab = clkTp;
            msTp = clkTp;
        }
    }
}