using System;
using System.Drawing;
using System.Windows.Forms;

namespace Gs.DevApp.ToolBox
{
    public class DragResizeHelp
    {
        #region Field
        private static bool isDragging = false;
        private const int Band = 5;
        private const int MinWidth = 10;
        private const int MinHeight = 10;
        private static EnumMousePointPosition m_MousePointPosition;
        private static Point p, p1;
        private static Label sbMsg;
        private static Control dragBox1;
        private static string dragCurrent_Name = "";
        private static DevExpress.XtraBars.Docking.ControlContainer dockPanel1_Container;
        #endregion

        #region Inner Object
        private enum EnumMousePointPosition
        {
            MouseSizeNone = 0, //'无
            MouseSizeRight = 1, //'拉伸右边框
            MouseSizeLeft = 2, //'拉伸左边框
            MouseSizeBottom = 3, //'拉伸下边框
            MouseSizeTop = 4, //'拉伸上边框
            MouseSizeTopLeft = 5, //'拉伸左上角
            MouseSizeTopRight = 6, //'拉伸右上角
            MouseSizeBottomLeft = 7, //'拉伸左下角
            MouseSizeBottomRight = 8, //'拉伸右下角
            MouseDrag = 9   // '鼠标拖动
        }
        #endregion

        #region Constructor
        public DragResizeHelp()
        {
            // Nothing to do.
        }
        #endregion
        private static void InitializeComponent(DevExpress.XtraEditors.XtraForm frm)
        {
            DevExpress.XtraBars.Docking.DockManager dockManager1;
            DevExpress.XtraBars.Docking.DockPanel dragBox2_Container;
            dockManager1 = new DevExpress.XtraBars.Docking.DockManager();
            dragBox2_Container = new DevExpress.XtraBars.Docking.DockPanel();
            dockPanel1_Container = new DevExpress.XtraBars.Docking.ControlContainer();
            ((System.ComponentModel.ISupportInitialize)(dockManager1)).BeginInit();
            // 
            // dockManager1
            // 
            dockManager1.Form = frm;
            dockManager1.RootPanels.AddRange(new DevExpress.XtraBars.Docking.DockPanel[] {
            dragBox2_Container});
            // 
            // dockPanel1
            // 
            dragBox2_Container.Controls.Add(dockPanel1_Container);
            dragBox2_Container.Dock = DevExpress.XtraBars.Docking.DockingStyle.Float;
            dragBox2_Container.FloatLocation = new System.Drawing.Point(691, 455);
            dragBox2_Container.ID = new System.Guid("319a7cf1-f26d-4049-8a96-8f9fbbd13cd2");
            dragBox2_Container.Location = new System.Drawing.Point(0, 0);
            dragBox2_Container.Name = "dockPanel1";
            dragBox2_Container.OriginalSize = new System.Drawing.Size(200, 200);
            dragBox2_Container.Size = new System.Drawing.Size(200, 200);
            dragBox2_Container.Text = "dockPanel1";
            dragBox2_Container.Options.AllowDockBottom = false;
            dragBox2_Container.Options.AllowDockFill = false;
            dragBox2_Container.Options.AllowDockLeft = false;
            dragBox2_Container.Options.AllowDockRight = false;
            dragBox2_Container.Options.AllowDockTop = false;
            dragBox2_Container.Options.ShowMaximizeButton = false;
            dragBox2_Container.Options.ShowMaximizeButton = false;
            // 
            // dockPanel1_Container
            // 
            dockPanel1_Container.Location = new System.Drawing.Point(5, 32);
            dockPanel1_Container.Name = "dockPanel1_Container";
            dockPanel1_Container.Size = new System.Drawing.Size(190, 164);
            dockPanel1_Container.TabIndex = 0;
            // 
            // XtraForm3
            // 
            ((System.ComponentModel.ISupportInitialize)(dockManager1)).EndInit();
            dragBox2_Container.ResumeLayout(false);
            frm.ResumeLayout(false);
            dragBox2_Container.Show();
        }
        #region Public Method
        public static void RegisterControl(DevExpress.XtraEditors.XtraForm frm, Control control, Control box1, Label lbMsg)
        {
            InitializeComponent(frm);
            if (control != null)
            {
                sbMsg = lbMsg;
                dragBox1 = box1;
                dragCurrent_Name = box1.Name;
                control.MouseDown += new MouseEventHandler(control_MouseDown);
                control.MouseLeave += new EventHandler(control_MouseLeave);
                control.MouseMove += new MouseEventHandler(control_MouseMove);
                control.Resize += myPanel_Resize;
            }
        }

        public static void UnRegisterControl(Control control)
        {
            if (control != null)
            {
                control.MouseDown -= new MouseEventHandler(control_MouseDown);
                control.MouseLeave -= new EventHandler(control_MouseLeave);
                control.MouseMove -= new MouseEventHandler(control_MouseMove);
            }
        }
        #endregion
        private static void control_MouseDown(object sender, MouseEventArgs e)
        {
            p.X = e.X;
            p.Y = e.Y;
            p1.X = e.X;
            p1.Y = e.Y;
            isDragging = true;
            dragCurrent_Name = (sender as Control).Parent.Name;
        }

        private static void myPanel_Resize(object sender, EventArgs e)
        {
            Control panel = sender as Control;
            if (panel != null && panel.Controls.Count > 0)
            {
                foreach (Control childControl in panel.Controls)
                {
                    // childControl.BorderStyle = DevExpress.XtraEditors.Controls.BorderStyles.NoBorder;
                    childControl.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
                    int newY = (panel.ClientSize.Height - childControl.Height) / 2;
                    childControl.Location = new Point(childControl.Location.X, newY);
                }

            }
        }
        private static void control_MouseLeave(object sender, EventArgs e)
        {
            m_MousePointPosition = EnumMousePointPosition.MouseSizeNone;
            Control control = sender as Control;
            control.Cursor = Cursors.Arrow;
        }
        private static void control_MouseMove(object sender, MouseEventArgs e)
        {
            if (!isDragging) { return; }
            Control lCtrl = (sender as Control);
            if (e.Button == MouseButtons.Left)
            {
                switch (m_MousePointPosition)
                {
                    case EnumMousePointPosition.MouseDrag:
                        lCtrl.Left = lCtrl.Left + e.X - p.X;
                        lCtrl.Top = lCtrl.Top + e.Y - p.Y;
                        break;
                    case EnumMousePointPosition.MouseSizeBottom:
                        lCtrl.Height = lCtrl.Height + e.Y - p1.Y;
                        p1.X = e.X;
                        p1.Y = e.Y; //'记录光标拖动的当前点
                        break;
                    case EnumMousePointPosition.MouseSizeBottomRight:
                        lCtrl.Width = lCtrl.Width + e.X - p1.X;
                        lCtrl.Height = lCtrl.Height + e.Y - p1.Y;
                        p1.X = e.X;
                        p1.Y = e.Y; //'记录光标拖动的当前点
                        break;
                    case EnumMousePointPosition.MouseSizeRight:
                        lCtrl.Width = lCtrl.Width + e.X - p1.X;        //
                        lCtrl.Height = lCtrl.Height + e.Y - p1.Y;
                        p1.X = e.X;
                        p1.Y = e.Y; //'记录光标拖动的当前点
                        break;
                    case EnumMousePointPosition.MouseSizeTop:
                        lCtrl.Top = lCtrl.Top + (e.Y - p.Y);
                        lCtrl.Height = lCtrl.Height - (e.Y - p.Y);
                        break;
                    case EnumMousePointPosition.MouseSizeLeft:
                        lCtrl.Left = lCtrl.Left + e.X - p.X;
                        lCtrl.Width = lCtrl.Width - (e.X - p.X);
                        break;
                    case EnumMousePointPosition.MouseSizeBottomLeft:
                        lCtrl.Left = lCtrl.Left + e.X - p.X;
                        lCtrl.Width = lCtrl.Width - (e.X - p.X);
                        lCtrl.Height = lCtrl.Height + e.Y - p1.Y;
                        p1.X = e.X;
                        p1.Y = e.Y; //'记录光标拖动的当前点
                        break;
                    case EnumMousePointPosition.MouseSizeTopRight:
                        lCtrl.Top = lCtrl.Top + (e.Y - p.Y);
                        lCtrl.Width = lCtrl.Width + (e.X - p1.X);
                        lCtrl.Height = lCtrl.Height - (e.Y - p.Y);
                        p1.X = e.X;
                        p1.Y = e.Y; //'记录光标拖动的当前点
                        break;
                    case EnumMousePointPosition.MouseSizeTopLeft:
                        lCtrl.Left = lCtrl.Left + e.X - p.X;
                        lCtrl.Top = lCtrl.Top + (e.Y - p.Y);
                        lCtrl.Width = lCtrl.Width - (e.X - p.X);
                        lCtrl.Height = lCtrl.Height - (e.Y - p.Y);
                        break;
                    default:
                        break;
                }
                if (lCtrl.Width < MinWidth) lCtrl.Width = MinWidth;
                if (lCtrl.Height < MinHeight) lCtrl.Height = MinHeight;
            }
            else
            {
                m_MousePointPosition = MousePointPosition(lCtrl.Size, e);   //'判断光标的位置状态
                Control control = sender as Control;
                switch (m_MousePointPosition)   //'改变光标
                {
                    case EnumMousePointPosition.MouseSizeNone:
                        control.Cursor = Cursors.Arrow;
                        //'箭头
                        break;
                    case EnumMousePointPosition.MouseDrag:
                        control.Cursor = Cursors.SizeAll;      //'四方向
                        break;
                    case EnumMousePointPosition.MouseSizeBottom:
                        control.Cursor = Cursors.SizeNS;       //'南北
                        break;
                    case EnumMousePointPosition.MouseSizeTop:
                        control.Cursor = Cursors.SizeNS;       //'南北
                        break;
                    case EnumMousePointPosition.MouseSizeLeft:
                        control.Cursor = Cursors.SizeWE;       //'东西
                        break;
                    case EnumMousePointPosition.MouseSizeRight:
                        control.Cursor = Cursors.SizeWE;       //'东西
                        break;
                    case EnumMousePointPosition.MouseSizeBottomLeft:
                        control.Cursor = Cursors.SizeNESW;     //'东北到南西
                        break;
                    case EnumMousePointPosition.MouseSizeBottomRight:
                        control.Cursor = Cursors.SizeNWSE;     //'东南到西北
                        break;
                    case EnumMousePointPosition.MouseSizeTopLeft:
                        control.Cursor = Cursors.SizeNWSE;     //'东南到西北
                        break;
                    case EnumMousePointPosition.MouseSizeTopRight:
                        control.Cursor = Cursors.SizeNESW;     //'东北到南西
                        break;
                    default:
                        break;
                }
            }


            if (dragBox1.Name == dragCurrent_Name)
            {
                if (IsOutsideBounds(lCtrl, dragBox1))
                {
                    dragBox1.Controls.Remove(lCtrl);
                    dockPanel1_Container.Controls.Add(lCtrl);
                    lCtrl.Left = 0;
                    lCtrl.Top = 10;
                    isDragging = false;
                    dragCurrent_Name = dockPanel1_Container.Name;
                }
            }
            else if (dockPanel1_Container.Name == dragCurrent_Name)
            {
                if (IsOutsideBounds(lCtrl, dockPanel1_Container))
                {
                    dockPanel1_Container.Controls.Remove(lCtrl);
                    dragBox1.Controls.Add(lCtrl);
                    lCtrl.Left = 0;
                    lCtrl.Top = 10;
                    isDragging = false;
                    dragCurrent_Name = dragBox1.Name;
                }
            }
            sbMsg.Text = lCtrl.Location.ToString() + "容器：" + dragCurrent_Name;

        }
        private static EnumMousePointPosition MousePointPosition(Size size, System.Windows.Forms.MouseEventArgs e)
        {
            if ((e.X >= -1 * Band) | (e.X <= size.Width) | (e.Y >= -1 * Band) | (e.Y <= size.Height))
            {
                if (e.X < Band)
                {
                    if (e.Y < Band)
                    {
                        return EnumMousePointPosition.MouseSizeTopLeft;
                    }
                    else
                    {
                        if (e.Y > -1 * Band + size.Height)
                        {
                            return EnumMousePointPosition.MouseSizeBottomLeft;
                        }
                        else
                        {
                            return EnumMousePointPosition.MouseSizeLeft;
                        }
                    }
                }
                else
                {
                    if (e.X > -1 * Band + size.Width)
                    {
                        if (e.Y < Band)
                        {
                            return EnumMousePointPosition.MouseSizeTopRight;
                        }
                        else
                        {
                            if (e.Y > -1 * Band + size.Height)
                            {
                                return EnumMousePointPosition.MouseSizeBottomRight;
                            }
                            else
                            {
                                return EnumMousePointPosition.MouseSizeRight;
                            }
                        }
                    }
                    else
                    {
                        if (e.Y < Band)
                        {
                            return EnumMousePointPosition.MouseSizeTop;
                        }
                        else
                        {
                            if (e.Y > -1 * Band + size.Height)
                            {
                                return EnumMousePointPosition.MouseSizeBottom;
                            }
                            else
                            {
                                return EnumMousePointPosition.MouseDrag;
                            }
                        }
                    }
                }
            }
            else
            {
                return EnumMousePointPosition.MouseSizeNone;
            }
        }

        public static bool IsOutsideBounds(Control childControl, Control parentControl)
        {
            if (parentControl == null) return true;
            if (parentControl == null) return true;
            int _w = childControl.Width / 2;
            int _h = childControl.Height / 2;
            // 获取父控件的客户区矩形（相对于父控件自己）
            Rectangle parentClientRect = parentControl.ClientRectangle;

            // 获取子控件相对于父控件的位置和尺寸
            Rectangle childRectRelativeToParent = childControl.Bounds;

            // 检查子控件的左边界是否超出了父控件的左边界
            if (childRectRelativeToParent.Left < parentClientRect.Left - _w)
                return true;

            // 检查子控件的右边界是否超出了父控件的右边界
            if (childRectRelativeToParent.Right > parentClientRect.Right + _w)
                return true;

            // 检查子控件的顶边界是否超出了父控件的顶边界
            if (childRectRelativeToParent.Top < parentClientRect.Top - _h)
                return true;

            // 检查子控件的底边界是否超出了父控件的底边界
            if (childRectRelativeToParent.Bottom > parentClientRect.Bottom + _h)
                return true;

            // 如果子控件的所有边界都在父控件的边界内，则返回false
            return false;
        }
    }
}