This is not about Anchor, I knew that already. But, I am trying to resize a control, a panel to be exact. For the project I am creating.

Is it possible to resize the control/panel dynamically? Just like how dragging control works?

CodePudding user response：

See if this component fulfils your requirements.

Note I didn't create the component, found it on the web a while back.

Usage

ControlMoverOrResizer.Init(panel1);

Component

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Globalization;
using System.Linq;
using System.Windows.Forms;

namespace ControlManager
{
    internal class ControlMoverOrResizer
    {
        private static bool _moving;
        private static Point _cursorStartPoint;
        private static bool _moveIsInterNal;
        private static bool _resizing;
        private static Size _currentControlStartSize;
        internal static bool MouseIsInLeftEdge { get; set; }
        internal static bool MouseIsInRightEdge { get; set; }
        internal static bool MouseIsInTopEdge { get; set; }
        internal static bool MouseIsInBottomEdge { get; set; }

        internal enum MoveOrResize
        {
            Move,
            Resize,
            MoveAndResize
        }

        internal static MoveOrResize WorkType { get; set; }

        internal static void Init(Control control)
        {
            Init(control, control);
        }

        internal static void Init(Control control, Control container)
        {
            _moving = false;
            _resizing = false;
            _moveIsInterNal = false;
            _cursorStartPoint = Point.Empty;
            MouseIsInLeftEdge = false;
            MouseIsInLeftEdge = false;
            MouseIsInRightEdge = false;
            MouseIsInTopEdge = false;
            MouseIsInBottomEdge = false;
            WorkType = MoveOrResize.MoveAndResize;
            control.MouseDown  = (sender, e) => StartMovingOrResizing(control, e);
            control.MouseUp  = (sender, e) => StopDragOrResizing(control);
            control.MouseMove  = (sender, e) => MoveControl(container, e);
        }

        private static void UpdateMouseEdgeProperties(Control control, Point mouseLocationInControl)
        {
            if (WorkType == MoveOrResize.Move)
            {
                return;
            }
            MouseIsInLeftEdge = Math.Abs(mouseLocationInControl.X) <= 2;
            MouseIsInRightEdge = Math.Abs(mouseLocationInControl.X - control.Width) <= 2;
            MouseIsInTopEdge = Math.Abs(mouseLocationInControl.Y ) <= 2;
            MouseIsInBottomEdge = Math.Abs(mouseLocationInControl.Y - control.Height) <= 2;
        }

        private static void UpdateMouseCursor(Control control)
        {
            if (WorkType == MoveOrResize.Move)
            {
                return;
            }
            if (MouseIsInLeftEdge )
            {
                if (MouseIsInTopEdge)
                {
                    control.Cursor = Cursors.SizeNWSE;
                }
                else if (MouseIsInBottomEdge)
                {
                    control.Cursor = Cursors.SizeNESW;
                }
                else
                {
                    control.Cursor = Cursors.SizeWE;
                }
            }
            else if (MouseIsInRightEdge)
            {
                if (MouseIsInTopEdge)
                {
                    control.Cursor = Cursors.SizeNESW;
                }
                else if (MouseIsInBottomEdge)
                {
                    control.Cursor = Cursors.SizeNWSE;
                }
                else
                {
                    control.Cursor = Cursors.SizeWE;
                }
            }
            else if (MouseIsInTopEdge || MouseIsInBottomEdge)
            {
                control.Cursor = Cursors.SizeNS;
            }
            else
            {
                control.Cursor = Cursors.Default;
            }
        }

        private static void StartMovingOrResizing(Control control, MouseEventArgs e)
        {
            if (_moving || _resizing)
            {
                return;
            }
            if (WorkType!=MoveOrResize.Move &&
                (MouseIsInRightEdge || MouseIsInLeftEdge || MouseIsInTopEdge || MouseIsInBottomEdge))
            {
                _resizing = true;
                _currentControlStartSize = control.Size;
            }
            else if (WorkType!=MoveOrResize.Resize)
            {
                _moving = true;
                control.Cursor = Cursors.Hand;
            }
            _cursorStartPoint = new Point(e.X, e.Y);
            control.Capture = true;
        }

        private static void MoveControl(Control control, MouseEventArgs e)
        {
            if (!_resizing && ! _moving)
            {
                UpdateMouseEdgeProperties(control, new Point(e.X, e.Y));
                UpdateMouseCursor(control);
            }
            if (_resizing)
            {
                if (MouseIsInLeftEdge)
                {
                    if (MouseIsInTopEdge)
                    {
                        control.Width -= (e.X - _cursorStartPoint.X);
                        control.Left  = (e.X - _cursorStartPoint.X); 
                        control.Height -= (e.Y - _cursorStartPoint.Y);
                        control.Top  = (e.Y - _cursorStartPoint.Y);
                    }
                    else if (MouseIsInBottomEdge)
                    {
                        control.Width -= (e.X - _cursorStartPoint.X);
                        control.Left  = (e.X - _cursorStartPoint.X);
                        control.Height = (e.Y - _cursorStartPoint.Y)   _currentControlStartSize.Height;                    
                    }
                    else
                    {
                        control.Width -= (e.X - _cursorStartPoint.X);
                        control.Left  = (e.X - _cursorStartPoint.X) ;
                    }
                }
                else if (MouseIsInRightEdge)
                {
                    if (MouseIsInTopEdge)
                    {
                        control.Width = (e.X - _cursorStartPoint.X)   _currentControlStartSize.Width;
                        control.Height -= (e.Y - _cursorStartPoint.Y);
                        control.Top  = (e.Y - _cursorStartPoint.Y);

                    }
                    else if (MouseIsInBottomEdge)
                    {
                        control.Width = (e.X - _cursorStartPoint.X)   _currentControlStartSize.Width;
                        control.Height = (e.Y - _cursorStartPoint.Y)   _currentControlStartSize.Height;                    
                    }
                    else
                    {
                        control.Width = (e.X - _cursorStartPoint.X) _currentControlStartSize.Width;
                    }
                }
                else if (MouseIsInTopEdge)
                {
                    control.Height -= (e.Y - _cursorStartPoint.Y);
                    control.Top  = (e.Y - _cursorStartPoint.Y);
                }
                else if (MouseIsInBottomEdge)
                {
                    control.Height = (e.Y - _cursorStartPoint.Y)   _currentControlStartSize.Height;                    
                }
                else
                {
                     StopDragOrResizing(control);
                }
            }
            else if (_moving)
            {
                _moveIsInterNal = !_moveIsInterNal;
                if (!_moveIsInterNal)
                {
                    int x = (e.X - _cursorStartPoint.X)   control.Left;
                    int y = (e.Y - _cursorStartPoint.Y)   control.Top;
                    control.Location = new Point(x, y);
                }
            }
        }

        private static void StopDragOrResizing(Control control)
        {
            _resizing = false;
            _moving = false;
            control.Capture = false;
            UpdateMouseCursor(control);
        }

        #region Save And Load

        private static List<Control> GetAllChildControls(Control control, List<Control> list)
        {
            List<Control> controls = control.Controls.Cast<Control>().ToList();
            list.AddRange(controls);
            return controls.SelectMany(ctrl => GetAllChildControls(ctrl, list)).ToList();
        }

        internal static string GetSizeAndPositionOfControlsToString(Control container)
        {
            List<Control> controls = new List<Control>();
            GetAllChildControls(container, controls);
            CultureInfo cultureInfo = new CultureInfo("en");
            string info = string.Empty;
            foreach (Control control in controls)
            {
                info  = control.Name   ":"   control.Left.ToString(cultureInfo)   ","   control.Top.ToString(cultureInfo)   ","  
                        control.Width.ToString(cultureInfo)   ","   control.Height.ToString(cultureInfo)   "*";
            }
            return info;
        }
        internal static void SetSizeAndPositionOfControlsFromString(Control container, string controlsInfoStr)
        {
            List<Control> controls = new List<Control>();
            GetAllChildControls(container, controls);
            string[] controlsInfo = controlsInfoStr.Split(new []{"*"},StringSplitOptions.RemoveEmptyEntries );
            Dictionary<string, string> controlsInfoDictionary = new Dictionary<string, string>();
            foreach (string controlInfo in controlsInfo)
            {
                string[] info = controlInfo.Split(new [] { ":" }, StringSplitOptions.RemoveEmptyEntries);
                if (!controlsInfoDictionary.ContainsKey(info[0]))
                {
                    controlsInfoDictionary.Add(info[0], info[1]);
                }
                
            }
            foreach (Control control in controls)
            {
                string propertiesStr;
                controlsInfoDictionary.TryGetValue(control.Name, out propertiesStr);
                string[] properties = propertiesStr.Split(new [] { "," }, StringSplitOptions.RemoveEmptyEntries);
                if (properties.Length == 4)
                {
                    control.Left = int.Parse(properties[0]);
                    control.Top = int.Parse(properties[1]);
                    control.Width = int.Parse(properties[2]);
                    control.Height = int.Parse(properties[3]);
                }
            }
        }

        #endregion
    }
}

CodePudding user response：

Unfortunately "Size" property of "controls" is not variable, thus you cannot set or change value after project is built. May you can consider checking out if Developer Tools Collections DevExpress, Telerik etc. can give you that ability. Or better start thinking about changing your project into WPF application.