// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Diagnostics;
using System.Drawing;
using System.Runtime.InteropServices;
using static Interop;

namespace System.Windows.Forms.Design.Behavior
{
    /// <summary>
    ///  The ResizeBehavior is pushed onto the BehaviorStack in response to a positively hit tested SelectionGlyph.  The ResizeBehavior simply tracks the MouseMove messages and updates the bounds of the relatd control based on the new mouse location and the resize Rules.
    /// </summary>
    internal class ResizeBehavior : Behavior
    {
        private struct ResizeComponent
        {
            public object resizeControl;
            public Rectangle resizeBounds;
            public SelectionRules resizeRules;
        }

        private ResizeComponent[] _resizeComponents;
        private readonly IServiceProvider _serviceProvider;
        private BehaviorService _behaviorService;
        private SelectionRules _targetResizeRules; //rules dictating which sizes we can change
        private Point _initialPoint; //the initial point of the mouse down
        private bool _dragging; //indicates that the behavior is currently 'dragging'
        private bool _pushedBehavior;
        private bool _initialResize; //true for the first resize of the control, false after that.
        private DesignerTransaction _resizeTransaction; //the transaction we create for the resize
        private const int MINSIZE = 10;
        private const int BorderSize = 2;
        private DragAssistanceManager _dragManager; //this object will integrate SnapLines into the resize
        private Point _lastMouseLoc; //helps us avoid re-entering code if the mouse hasn't moved
        private Point _parentLocation; //used to snap resize ops to the grid
        private Size _parentGridSize; //used to snap resize ops to the grid
        private Point _lastMouseAbs; // last absolute mouse position
        private Point _lastSnapOffset; //the last snapoffset we used.
        private bool _didSnap; //did we actually snap.
        private Control _primaryControl; //the primary control the status bar will queue off of

        private Cursor _cursor = Cursors.Default; //used to set the correct cursor during resizing
        private readonly StatusCommandUI _statusCommandUI; // used to update the StatusBar Information.

        private Region _lastResizeRegion;
        private bool _captureLost;

        /// <summary>
        ///  Constructor that caches all values for perf. reasons.
        /// </summary>
        internal ResizeBehavior(IServiceProvider serviceProvider)
        {
            _serviceProvider = serviceProvider;
            _dragging = false;
            _pushedBehavior = false;
            _lastSnapOffset = Point.Empty;
            _didSnap = false;
            _statusCommandUI = new StatusCommandUI(serviceProvider);
        }

        /// <summary>
        ///  Demand creates the BehaviorService.
        /// </summary>
        private BehaviorService BehaviorService
        {
            get
            {
                if (_behaviorService is null)
                {
                    _behaviorService = (BehaviorService)_serviceProvider.GetService(typeof(BehaviorService));
                }

                return _behaviorService;
            }
        }

        public override Cursor Cursor
        {
            get
            {
                return _cursor;
            }
        }

        /// <summary>
        ///  Called during the resize operation, we'll try to determine an offset so that the controls snap to the grid settings of the parent.
        /// </summary>
        private Rectangle AdjustToGrid(Rectangle controlBounds, SelectionRules rules)
        {
            Rectangle rect = controlBounds;

            if ((rules & SelectionRules.RightSizeable) != 0)
            {
                int xDelta = controlBounds.Right % _parentGridSize.Width;
                if (xDelta > _parentGridSize.Width / 2)
                {
                    rect.Width += _parentGridSize.Width - xDelta;
                }
                else
                {
                    rect.Width -= xDelta;
                }
            }
            else if ((rules & SelectionRules.LeftSizeable) != 0)
            {
                int xDelta = controlBounds.Left % _parentGridSize.Width;
                if (xDelta > _parentGridSize.Width / 2)
                {
                    rect.X += _parentGridSize.Width - xDelta;
                    rect.Width -= _parentGridSize.Width - xDelta;
                }
                else
                {
                    rect.X -= xDelta;
                    rect.Width += xDelta;
                }
            }

            if ((rules & SelectionRules.BottomSizeable) != 0)
            {
                int yDelta = controlBounds.Bottom % _parentGridSize.Height;
                if (yDelta > _parentGridSize.Height / 2)
                {
                    rect.Height += _parentGridSize.Height - yDelta;
                }
                else
                {
                    rect.Height -= yDelta;
                }
            }
            else if ((rules & SelectionRules.TopSizeable) != 0)
            {
                int yDelta = controlBounds.Top % _parentGridSize.Height;
                if (yDelta > _parentGridSize.Height / 2)
                {
                    rect.Y += _parentGridSize.Height - yDelta;
                    rect.Height -= _parentGridSize.Height - yDelta;
                }
                else
                {
                    rect.Y -= yDelta;
                    rect.Height += yDelta;
                }
            }

            //validate our dimensions
            rect.Width = Math.Max(rect.Width, _parentGridSize.Width);
            rect.Height = Math.Max(rect.Height, _parentGridSize.Height);

            return rect;
        }

        /// <summary>
        ///  Builds up an array of snaplines used during resize to adjust/snap the controls bounds.
        /// </summary>
        private SnapLine[] GenerateSnapLines(SelectionRules rules, Point loc)
        {
            ArrayList lines = new ArrayList(2);
            //the four margins and edges of our control
            if ((rules & SelectionRules.BottomSizeable) != 0)
            {
                lines.Add(new SnapLine(SnapLineType.Bottom, loc.Y - 1));
                if (_primaryControl != null)
                {
                    lines.Add(new SnapLine(SnapLineType.Horizontal, loc.Y + _primaryControl.Margin.Bottom, SnapLine.MarginBottom, SnapLinePriority.Always));
                }
            }
            else if ((rules & SelectionRules.TopSizeable) != 0)
            {
                lines.Add(new SnapLine(SnapLineType.Top, loc.Y));
                if (_primaryControl != null)
                {
                    lines.Add(new SnapLine(SnapLineType.Horizontal, loc.Y - _primaryControl.Margin.Top, SnapLine.MarginTop, SnapLinePriority.Always));
                }
            }

            if ((rules & SelectionRules.RightSizeable) != 0)
            {
                lines.Add(new SnapLine(SnapLineType.Right, loc.X - 1));
                if (_primaryControl != null)
                {
                    lines.Add(new SnapLine(SnapLineType.Vertical, loc.X + _primaryControl.Margin.Right, SnapLine.MarginRight, SnapLinePriority.Always));
                }
            }
            else if ((rules & SelectionRules.LeftSizeable) != 0)
            {
                lines.Add(new SnapLine(SnapLineType.Left, loc.X));
                if (_primaryControl != null)
                {
                    lines.Add(new SnapLine(SnapLineType.Vertical, loc.X - _primaryControl.Margin.Left, SnapLine.MarginLeft, SnapLinePriority.Always));
                }
            }

            SnapLine[] l = new SnapLine[lines.Count];
            lines.CopyTo(l);

            return l;
        }

        /// <summary>
        ///  This is called in response to the mouse moving far enough away from its initial point.  Basically, we calculate the bounds for each control we're resizing and disable any adorners.
        /// </summary>
        private void InitiateResize()
        {
            bool useSnapLines = BehaviorService.UseSnapLines;
            ArrayList components = new ArrayList();
            //check to see if the current designer participate with SnapLines cache the control bounds
            for (int i = 0; i < _resizeComponents.Length; i++)
            {
                _resizeComponents[i].resizeBounds = ((Control)(_resizeComponents[i].resizeControl)).Bounds;
                if (useSnapLines)
                {
                    components.Add(_resizeComponents[i].resizeControl);
                }

                if (_serviceProvider.GetService(typeof(IDesignerHost)) is IDesignerHost designerHost)
                {
                    if (designerHost.GetDesigner(_resizeComponents[i].resizeControl as Component) is ControlDesigner designer)
                    {
                        _resizeComponents[i].resizeRules = designer.SelectionRules;
                    }
                    else
                    {
                        Debug.Fail("Initiating resize. Could not get the designer for " + _resizeComponents[i].resizeControl.ToString());
                        _resizeComponents[i].resizeRules = SelectionRules.None;
                    }
                }
            }

            //disable all glyphs in all adorners
            BehaviorService.EnableAllAdorners(false);
            //build up our resize transaction
            IDesignerHost host = (IDesignerHost)_serviceProvider.GetService(typeof(IDesignerHost));
            if (host != null)
            {
                string locString;
                if (_resizeComponents.Length == 1)
                {
                    string name = TypeDescriptor.GetComponentName(_resizeComponents[0].resizeControl);
                    if (name is null || name.Length == 0)
                    {
                        name = _resizeComponents[0].resizeControl.GetType().Name;
                    }

                    locString = string.Format(SR.BehaviorServiceResizeControl, name);
                }
                else
                {
                    locString = string.Format(SR.BehaviorServiceResizeControls, _resizeComponents.Length);
                }

                _resizeTransaction = host.CreateTransaction(locString);
            }

            _initialResize = true;
            if (useSnapLines)
            {
                //instantiate our class to manage snap/margin lines...
                _dragManager = new DragAssistanceManager(_serviceProvider, components, true);
            }
            else if (_resizeComponents.Length > 0)
            {
                //try to get the parents grid and snap settings
                if (_resizeComponents[0].resizeControl is Control control && control.Parent != null)
                {
                    PropertyDescriptor snapProp = TypeDescriptor.GetProperties(control.Parent)["SnapToGrid"];
                    if (snapProp != null && (bool)snapProp.GetValue(control.Parent))
                    {
                        PropertyDescriptor gridProp = TypeDescriptor.GetProperties(control.Parent)["GridSize"];
                        if (gridProp != null)
                        {
                            //cache of the gridsize and the location of the parent on the adornerwindow
                            _parentGridSize = (Size)gridProp.GetValue(control.Parent);
                            _parentLocation = _behaviorService.ControlToAdornerWindow(control);
                            _parentLocation.X -= control.Location.X;
                            _parentLocation.Y -= control.Location.Y;
                        }
                    }
                }
            }

            _captureLost = false;
        }

        /// <summary>
        ///  In response to a MouseDown, the SelectionBehavior will push (initiate) a dragBehavior by alerting the SelectionMananger that a new control has been selected and the mouse is down. Note that this is only if we find the related control's Dock property == none.
        /// </summary>
        public override bool OnMouseDown(Glyph g, MouseButtons button, Point mouseLoc)
        {
            //we only care about the right mouse button for resizing
            if (button != MouseButtons.Left)
            {
                //pass any other mouse click along - unless we've already started our resize in which case we'll ignore it
                return _pushedBehavior;
            }

            //start with no selection rules and try to obtain this info from the glyph
            _targetResizeRules = SelectionRules.None;
            if (g is SelectionGlyphBase sgb)
            {
                _targetResizeRules = sgb.SelectionRules;
                _cursor = sgb.HitTestCursor;
            }

            if (_targetResizeRules == SelectionRules.None)
            {
                return false;
            }

            ISelectionService selSvc = (ISelectionService)_serviceProvider.GetService(typeof(ISelectionService));
            if (selSvc is null)
            {
                return false;
            }

            _initialPoint = mouseLoc;
            _lastMouseLoc = mouseLoc;
            //build up a list of our selected controls
            _primaryControl = selSvc.PrimarySelection as Control;

            // Since we don't know exactly how many valid objects we are going to have we use this temp
            ArrayList components = new ArrayList();
            foreach (object o in selSvc.GetSelectedComponents())
            {
                if (o is Control)
                {
                    //don't drag locked controls
                    PropertyDescriptor prop = TypeDescriptor.GetProperties(o)["Locked"];
                    if (prop != null)
                    {
                        if ((bool)prop.GetValue(o))
                        {
                            continue;
                        }
                    }

                    components.Add(o);
                }
            }

            if (components.Count == 0)
            {
                return false;
            }

            _resizeComponents = new ResizeComponent[components.Count];
            for (int i = 0; i < components.Count; i++)
            {
                _resizeComponents[i].resizeControl = components[i];
            }

            //push this resizebehavior
            _pushedBehavior = true;
            BehaviorService.PushCaptureBehavior(this);
            return false;
        }

        /// <summary>
        ///  This method is called when we lose capture, which can occur when another window requests capture or the user presses ESC during a drag.  We check to see if we are currently dragging, and if we are we abort the transaction.  We pop our behavior off the stack at this time.
        /// </summary>
        public override void OnLoseCapture(Glyph g, EventArgs e)
        {
            _captureLost = true;
            if (_pushedBehavior)
            {
                _pushedBehavior = false;
                Debug.Assert(BehaviorService != null, "We should have a behavior service.");
                if (BehaviorService != null)
                {
                    if (_dragging)
                    {
                        _dragging = false;
                        //make sure we get rid of the selection rectangle
                        for (int i = 0; !_captureLost && i < _resizeComponents.Length; i++)
                        {
                            Control control = _resizeComponents[i].resizeControl as Control;
                            Rectangle borderRect = BehaviorService.ControlRectInAdornerWindow(control);
                            if (!borderRect.IsEmpty)
                            {
                                using (Graphics graphics = BehaviorService.AdornerWindowGraphics)
                                {
                                    graphics.SetClip(borderRect);
                                    using (Region newRegion = new Region(borderRect))
                                    {
                                        newRegion.Exclude(Rectangle.Inflate(borderRect, -BorderSize, -BorderSize));
                                        BehaviorService.Invalidate(newRegion);
                                    }

                                    graphics.ResetClip();
                                }
                            }
                        }

                        //re-enable all glyphs in all adorners
                        BehaviorService.EnableAllAdorners(true);
                    }

                    BehaviorService.PopBehavior(this);

                    if (_lastResizeRegion != null)
                    {
                        BehaviorService.Invalidate(_lastResizeRegion); //might be the same, might not.
                        _lastResizeRegion.Dispose();
                        _lastResizeRegion = null;
                    }
                }
            }

            Debug.Assert(!_dragging, "How can we be dragging without pushing a behavior?");
            // If we still have a transaction, roll it back.
            if (_resizeTransaction != null)
            {
                DesignerTransaction t = _resizeTransaction;
                _resizeTransaction = null;
                using (t)
                {
                    t.Cancel();
                }
            }
        }

        internal static int AdjustPixelsForIntegralHeight(Control control, int pixelsMoved)
        {
            PropertyDescriptor propIntegralHeight = TypeDescriptor.GetProperties(control)["IntegralHeight"];
            if (propIntegralHeight != null)
            {
                object value = propIntegralHeight.GetValue(control);
                if (value is bool && (bool)value == true)
                {
                    PropertyDescriptor propItemHeight = TypeDescriptor.GetProperties(control)["ItemHeight"];
                    if (propItemHeight != null)
                    {
                        if (pixelsMoved >= 0)
                        {
                            return pixelsMoved - (pixelsMoved % (int)propItemHeight.GetValue(control));
                        }
                        else
                        {
                            int integralHeight = (int)propItemHeight.GetValue(control);
                            return pixelsMoved - (integralHeight - (Math.Abs(pixelsMoved) % integralHeight));
                        }
                    }
                }
            }

            //if the control does not have the IntegralHeight property, then the pixels moved are fine
            return pixelsMoved;
        }

        /// <summary>
        ///  This method will either initiate a new resize operation or continue with an existing one.  If we're currently dragging (i.e. resizing) then we look at the resize rules and set the bounds of each control to the new location of the mouse pointer.
        /// </summary>
        public override bool OnMouseMove(Glyph g, MouseButtons button, Point mouseLoc)
        {
            if (!_pushedBehavior)
            {
                return false;
            }

            bool altKeyPressed = Control.ModifierKeys == Keys.Alt;
            if (altKeyPressed && _dragManager != null)
            {
                //erase any snaplines (if we had any)
                _dragManager.EraseSnapLines();
            }

            if (!altKeyPressed && mouseLoc.Equals(_lastMouseLoc))
            {
                return true;
            }

            // When DesignerWindowPane has scrollbars and we resize, shrinking the the DesignerWindowPane makes it look like the mouse has moved to the BS.  To compensate for that we keep track of the mouse's previous position in screen coordinates, and use that to compare if the mouse has really moved.
            if (_lastMouseAbs != Point.Empty)
            {
                var mouseLocAbs = new Point(mouseLoc.X, mouseLoc.Y);
                User32.ClientToScreen(new HandleRef(this, _behaviorService.AdornerWindowControl.Handle), ref mouseLocAbs);
                if (mouseLocAbs.X == _lastMouseAbs.X && mouseLocAbs.Y == _lastMouseAbs.Y)
                {
                    return true;
                }
            }

            if (!_dragging)
            {
                if (Math.Abs(_initialPoint.X - mouseLoc.X) > DesignerUtils.MinDragSize.Width / 2 || Math.Abs(_initialPoint.Y - mouseLoc.Y) > DesignerUtils.MinDragSize.Height / 2)
                {
                    InitiateResize();
                    _dragging = true;
                }
                else
                {
                    return false;
                }
            }

            if (_resizeComponents is null || _resizeComponents.Length == 0)
            {
                return false;
            }

            // we do these separately so as not to disturb the cached sizes for values we're not actually changing.  For example, if a control is docked top and we modify the height, the width shouldn't be modified.
            PropertyDescriptor propWidth = null;
            PropertyDescriptor propHeight = null;
            PropertyDescriptor propTop = null;
            PropertyDescriptor propLeft = null;

            // We do this to make sure that Undo works correctly.
            if (_initialResize)
            {
                propWidth = TypeDescriptor.GetProperties(_resizeComponents[0].resizeControl)["Width"];
                propHeight = TypeDescriptor.GetProperties(_resizeComponents[0].resizeControl)["Height"];
                propTop = TypeDescriptor.GetProperties(_resizeComponents[0].resizeControl)["Top"];
                propLeft = TypeDescriptor.GetProperties(_resizeComponents[0].resizeControl)["Left"];

                // validate each of the property descriptors.
                if (propWidth != null && !typeof(int).IsAssignableFrom(propWidth.PropertyType))
                {
                    propWidth = null;
                }

                if (propHeight != null && !typeof(int).IsAssignableFrom(propHeight.PropertyType))
                {
                    propHeight = null;
                }

                if (propTop != null && !typeof(int).IsAssignableFrom(propTop.PropertyType))
                {
                    propTop = null;
                }

                if (propLeft != null && !typeof(int).IsAssignableFrom(propLeft.PropertyType))
                {
                    propLeft = null;
                }
            }

            Control targetControl = _resizeComponents[0].resizeControl as Control;
            _lastMouseLoc = mouseLoc;
            _lastMouseAbs = new Point(mouseLoc.X, mouseLoc.Y);
            User32.ClientToScreen(new HandleRef(this, _behaviorService.AdornerWindowControl.Handle), ref _lastMouseAbs);
            int minHeight = Math.Max(targetControl.MinimumSize.Height, MINSIZE);
            int minWidth = Math.Max(targetControl.MinimumSize.Width, MINSIZE);
            if (_dragManager != null)
            {
                bool shouldSnap = true;
                bool shouldSnapHorizontally = true;
                //if the targetcontrol is at min-size then we do not want to offer up snaplines
                if ((((_targetResizeRules & SelectionRules.BottomSizeable) != 0) || ((_targetResizeRules & SelectionRules.TopSizeable) != 0)) &&
                    (targetControl.Height == minHeight))
                {
                    shouldSnap = false;
                }
                else if ((((_targetResizeRules & SelectionRules.RightSizeable) != 0) || ((_targetResizeRules & SelectionRules.LeftSizeable) != 0)) &&
                    (targetControl.Width == minWidth))
                {
                    shouldSnap = false;
                }

                //if the targetControl has IntegralHeight turned on, then don't snap if the control can be resized vertically
                PropertyDescriptor propIntegralHeight = TypeDescriptor.GetProperties(targetControl)["IntegralHeight"];
                if (propIntegralHeight != null)
                {
                    object value = propIntegralHeight.GetValue(targetControl);
                    if (value is bool && (bool)value == true)
                    {
                        shouldSnapHorizontally = false;
                    }
                }

                if (!altKeyPressed && shouldSnap)
                {
                    //here, ask the snapline engine to suggest an offset during our resize
                    // Remembering the last snapoffset allows us to correctly erase snaplines, if the user subsequently holds down the Alt-Key. Remember that we don't physically move the mouse, we move the control. So if we didn't remember the last snapoffset and the user then hit the Alt-Key, we would actually redraw the control at the actual mouse location, which would make the control "jump" which is not what the user would expect. Why does the control "jump"? Because when a control is snapped, we have offset the control relative to where the mouse is, but we have not update the physical mouse position.
                    // When the user hits the Alt-Key they expect the control to be where it was (whether snapped or not). we can't rely on lastSnapOffset to check whether we snapped. We used to check if it was empty, but it can be empty and we still snapped (say the control was snapped, as you continue to move the mouse, it will stay snapped for a while. During that while the snapoffset will got from x to -x (or vice versa) and a one point hit 0.
                    // Since we have to calculate the new size/location differently based on whether we snapped or not, we have to know for sure if we snapped. We do different math because of bug 264996:
                    //  - if you snap, we want to move the control edge.
                    //  - otherwise, we just want to change the size by the number of pixels moved.
                    _lastSnapOffset = _dragManager.OnMouseMove(targetControl, GenerateSnapLines(_targetResizeRules, mouseLoc), ref _didSnap, shouldSnapHorizontally);
                }
                else
                {
                    _dragManager.OnMouseMove(new Rectangle(-100, -100, 0, 0));/*just an invalid rect - so we won't snap*///);
                }

                // If there's a line to snap to, the offset will come back non-zero. In that case we should adjust the mouse position with the offset such that the size calculation below takes that offset into account. If there's no line, then the offset is 0, and there's no harm in adding the offset.
                mouseLoc.X += _lastSnapOffset.X;
                mouseLoc.Y += _lastSnapOffset.Y;
            }

            // IF WE ARE SNAPPING TO A CONTROL, then we also need to adjust for the offset between the initialPoint (where the MouseDown happened) and the edge of the control otherwise we would be those pixels off when resizing the control. Remember that snaplines are based on the targetControl, so we need to use the targetControl to figure out the offset.
            Rectangle controlBounds = new Rectangle(_resizeComponents[0].resizeBounds.X, _resizeComponents[0].resizeBounds.Y,
                                                      _resizeComponents[0].resizeBounds.Width, _resizeComponents[0].resizeBounds.Height);
            if ((_didSnap) && (targetControl.Parent != null))
            {
                controlBounds.Location = _behaviorService.MapAdornerWindowPoint(targetControl.Parent.Handle, controlBounds.Location);
                if (targetControl.Parent.IsMirrored)
                {
                    controlBounds.Offset(-controlBounds.Width, 0);
                }
            }

            Rectangle newBorderRect = Rectangle.Empty;
            Rectangle targetBorderRect = Rectangle.Empty;
            bool drawSnapline = true;
            Color backColor = targetControl.Parent != null ? targetControl.Parent.BackColor : Color.Empty;
            for (int i = 0; i < _resizeComponents.Length; i++)
            {
                Control control = _resizeComponents[i].resizeControl as Control;
                Rectangle bounds = control.Bounds;
                Rectangle oldBounds = bounds;
                // We need to compute the offset beased on the original cached Bounds ... ListBox doesnt allow drag on the top boundary if this is not done when it is "IntegralHeight"
                Rectangle baseBounds = _resizeComponents[i].resizeBounds;
                Rectangle oldBorderRect = BehaviorService.ControlRectInAdornerWindow(control);
                bool needToUpdate = true;
                // The ResizeBehavior can easily get into a situation where we are fighting with a layout engine. E.g., We resize control to 50px, LayoutEngine lays out and finds 50px was too small and resized back to 100px.  This is what should happen, but it looks bad in the designer.  To avoid the flicker we temporarily turn off painting while we do the resize.
                User32.SendMessageW(control, User32.WM.SETREDRAW, PARAM.FromBool(false));
                try
                {
                    bool fRTL = false;
                    // If the container is mirrored the control origin is in upper-right, so we need to adjust our math for that. Remember that mouse coords have origin in upper left.
                    if (control.Parent != null && control.Parent.IsMirrored)
                    {
                        fRTL = true;
                    }

                    // figure out which ones we're actually changing so we don't blow away the controls cached sizing state.  This is important if things are docked we don't want to destroy their "pre-dock" size.
                    BoundsSpecified specified = BoundsSpecified.None;
                    // When we check if we should change height, width, location,  we first have to check if the targetControl allows resizing, and then if the control we are currently resizing allows it as well.
                    SelectionRules resizeRules = _resizeComponents[i].resizeRules;
                    if (((_targetResizeRules & SelectionRules.BottomSizeable) != 0) &&
                        ((resizeRules & SelectionRules.BottomSizeable) != 0))
                    {
                        int pixelHeight;
                        if (_didSnap)
                        {
                            pixelHeight = mouseLoc.Y - controlBounds.Bottom;
                        }
                        else
                        {
                            pixelHeight = AdjustPixelsForIntegralHeight(control, mouseLoc.Y - _initialPoint.Y);
                        }

                        bounds.Height = Math.Max(minHeight, baseBounds.Height + pixelHeight);
                        specified |= BoundsSpecified.Height;
                    }

                    if (((_targetResizeRules & SelectionRules.TopSizeable) != 0) &&
                        ((resizeRules & SelectionRules.TopSizeable) != 0))
                    {
                        int yOffset;
                        if (_didSnap)
                        {
                            yOffset = controlBounds.Y - mouseLoc.Y;
                        }
                        else
                        {
                            yOffset = AdjustPixelsForIntegralHeight(control, _initialPoint.Y - mouseLoc.Y);
                        }

                        specified |= BoundsSpecified.Height;
                        bounds.Height = Math.Max(minHeight, baseBounds.Height + yOffset);
                        if ((bounds.Height != minHeight) ||
                             ((bounds.Height == minHeight) && (oldBounds.Height != minHeight)))
                        {
                            specified |= BoundsSpecified.Y;
                            //if you do it fast enough, we actually could end up placing the control off the parent (say off the form), so enforce a "minimum" location
                            bounds.Y = Math.Min(baseBounds.Bottom - minHeight, baseBounds.Y - yOffset);
                        }
                    }

                    if (((((_targetResizeRules & SelectionRules.RightSizeable) != 0) && ((resizeRules & SelectionRules.RightSizeable) != 0)) && (!fRTL)) ||
                       ((((_targetResizeRules & SelectionRules.LeftSizeable) != 0) && ((resizeRules & SelectionRules.LeftSizeable) != 0)) && (fRTL)))
                    {
                        specified |= BoundsSpecified.Width;
                        int xOffset = _initialPoint.X;
                        if (_didSnap)
                        {
                            xOffset = !fRTL ? controlBounds.Right : controlBounds.Left;
                        }

                        bounds.Width = Math.Max(minWidth, baseBounds.Width + (!fRTL ? (mouseLoc.X - xOffset) : (xOffset - mouseLoc.X)));
                    }

                    if (((((_targetResizeRules & SelectionRules.RightSizeable) != 0) && ((resizeRules & SelectionRules.RightSizeable) != 0)) && (fRTL)) ||
                       ((((_targetResizeRules & SelectionRules.LeftSizeable) != 0) && ((resizeRules & SelectionRules.LeftSizeable) != 0)) && (!fRTL)))
                    {
                        specified |= BoundsSpecified.Width;
                        int xPos = _initialPoint.X;
                        if (_didSnap)
                        {
                            xPos = !fRTL ? controlBounds.Left : controlBounds.Right;
                        }

                        int xOffset = !fRTL ? (xPos - mouseLoc.X) : (mouseLoc.X - xPos);
                        bounds.Width = Math.Max(minWidth, baseBounds.Width + xOffset);
                        if ((bounds.Width != minWidth) ||
                             ((bounds.Width == minWidth) && (oldBounds.Width != minWidth)))
                        {
                            specified |= BoundsSpecified.X;
                            //if you do it fast enough, we actually could end up placing the control off the parent (say off the form), so enforce a "minimum" location
                            bounds.X = Math.Min(baseBounds.Right - minWidth, baseBounds.X - xOffset);
                        }
                    }

                    if (!_parentGridSize.IsEmpty)
                    {
                        bounds = AdjustToGrid(bounds, _targetResizeRules);
                    }

                    // Checking specified (check the diff) rather than bounds.<foo> != resizeBounds[i].<foo> also handles the following corner cases:
                    // 1. Create a form and add 2 buttons. Make sure that they are snapped to the left edge. Now grab the left edge of button 1, and start resizing to the left, past the snapline you will initially get, and then back to the right. What you would expect is to get the left edge snapline again. But without the specified check you wouldn't. This is because the bounds.<foo> != resizeBounds[i].<foo> checks would fail, since the new size would now be the original size. We could probably live with that, except that we draw the snapline below, since we correctly identified one. We could hack it so that we didn't draw the snapline, but that would confuse the user even more.
                    // 2. Create a form and add a single button. Place it at 100,100. Now start resizing it to the left and then back to the right. Note that with the original check (see diff), you would never be able to resize it back to position 100,100. You would get to 99,100 and then to 101,100.
                    if (((specified & BoundsSpecified.Width) == BoundsSpecified.Width) &&
                        _dragging && _initialResize && propWidth != null)
                    {
                        propWidth.SetValue(_resizeComponents[i].resizeControl, bounds.Width);
                    }

                    if (((specified & BoundsSpecified.Height) == BoundsSpecified.Height) &&
                        _dragging && _initialResize && propHeight != null)
                    {
                        propHeight.SetValue(_resizeComponents[i].resizeControl, bounds.Height);
                    }

                    if (((specified & BoundsSpecified.X) == BoundsSpecified.X) &&
                        _dragging && _initialResize && propLeft != null)
                    {
                        propLeft.SetValue(_resizeComponents[i].resizeControl, bounds.X);
                    }

                    if (((specified & BoundsSpecified.Y) == BoundsSpecified.Y) &&
                        _dragging && _initialResize && propTop != null)
                    {
                        propTop.SetValue(_resizeComponents[i].resizeControl, bounds.Y);
                    }

                    // We check the dragging bit here at every turn, because if there was a popup we may have lost capture and we are terminated.  At that point we shouldn't make any changes.
                    if (_dragging)
                    {
                        control.SetBounds(bounds.X, bounds.Y, bounds.Width, bounds.Height, specified);
                        //Get the new resize border
                        newBorderRect = BehaviorService.ControlRectInAdornerWindow(control);
                        if (control.Equals(targetControl))
                        {
                            Debug.Assert(i == 0, "The first control in the Selection should be the target control");
                            targetBorderRect = newBorderRect;
                        }

                        //Check that the control really did resize itself. Some controls (like ListBox, MonthCalendar) might adjust to a slightly different size than the one we pass in SetBounds. If if didn't size, then there's no need to invalidate anything
                        if (control.Bounds == oldBounds)
                        {
                            needToUpdate = false;
                        }

                        // We would expect the bounds now to be what we set it to above, but this might not be the case. If the control is hosted with e.g. a FLP, then setting the bounds above actually might force a re-layout, and the control will get moved to another spot. In this case, we don't really want to draw a snapline. Even if we snapped to a snapline, if the control got moved, the snapline would be in the wrong place.
                        if (control.Bounds != bounds)
                        {
                            drawSnapline = false;
                        }
                    }

                    if (control == _primaryControl && _statusCommandUI != null)
                    {
                        _statusCommandUI.SetStatusInformation(control);
                    }
                }
                finally
                {
                    // While we were resizing we discarded painting messages to reduce flicker.  We now turn painting back on and manually refresh the controls.
                    User32.SendMessageW(control, User32.WM.SETREDRAW, PARAM.FromBool(true));
                    //update the control
                    if (needToUpdate)
                    {
                        Control parent = control.Parent;
                        if (parent != null)
                        {
                            control.Invalidate(/* invalidateChildren = */ true);
                            parent.Invalidate(oldBounds, /* invalidateChildren = */ true);
                            parent.Update();
                        }
                        else
                        {
                            control.Refresh();
                        }
                    }

                    //render the resize border
                    if (!newBorderRect.IsEmpty)
                    {
                        using (Region newRegion = new Region(newBorderRect))
                        {
                            newRegion.Exclude(Rectangle.Inflate(newBorderRect, -BorderSize, -BorderSize));
                            //No reason to get smart about only invalidating part of the border. Thought we could be but no.The reason is the order: ... the new border is drawn (last resize) On next mousemove, the control is resized which redraws the control AND ERASES THE BORDER Then we draw the new border - flash baby.                            Thus this will always flicker.
                            if (needToUpdate)
                            {
                                using (Region oldRegion = new Region(oldBorderRect))
                                {
                                    oldRegion.Exclude(Rectangle.Inflate(oldBorderRect, -BorderSize, -BorderSize));
                                    BehaviorService.Invalidate(oldRegion);
                                }
                            }

                            //draw the new border captureLost could be true if a popup came up and caused a lose focus
                            if (!_captureLost)
                            {
                                using (Graphics graphics = BehaviorService.AdornerWindowGraphics)
                                {
                                    if (_lastResizeRegion != null)
                                    {
                                        if (!_lastResizeRegion.Equals(newRegion, graphics))
                                        {
                                            _lastResizeRegion.Exclude(newRegion); //we don't want to invalidate this region.
                                            BehaviorService.Invalidate(_lastResizeRegion); //might be the same, might not.
                                            _lastResizeRegion.Dispose();
                                            _lastResizeRegion = null;
                                        }
                                    }

                                    DesignerUtils.DrawResizeBorder(graphics, newRegion, backColor);
                                }

                                if (_lastResizeRegion is null)
                                {
                                    _lastResizeRegion = newRegion.Clone(); //we will need to dispose it later.
                                }
                            }
                        }
                    }
                }
            }

            if ((drawSnapline) && (!altKeyPressed) && (_dragManager != null))
            {
                _dragManager.RenderSnapLinesInternal(targetBorderRect);
            }

            _initialResize = false;
            return true;
        }

        /// <summary>
        ///  This ends the Behavior by popping itself from the BehaviorStack.  Also, all Adorners are re-enabled at the end of a successful drag.
        /// </summary>
        public override bool OnMouseUp(Glyph g, MouseButtons button)
        {
            try
            {
                if (_dragging)
                {
                    if (_dragManager != null)
                    {
                        _dragManager.OnMouseUp();
                        _dragManager = null;
                        _lastSnapOffset = Point.Empty;
                        _didSnap = false;
                    }

                    if (_resizeComponents != null && _resizeComponents.Length > 0)
                    {
                        // we do these separately so as not to disturb the cached sizes for values we're not actually changing.  For example, if a control is docked top and we modify the height, the width shouldn't be modified.
                        PropertyDescriptor propWidth = TypeDescriptor.GetProperties(_resizeComponents[0].resizeControl)["Width"];
                        PropertyDescriptor propHeight = TypeDescriptor.GetProperties(_resizeComponents[0].resizeControl)["Height"];
                        PropertyDescriptor propTop = TypeDescriptor.GetProperties(_resizeComponents[0].resizeControl)["Top"];
                        PropertyDescriptor propLeft = TypeDescriptor.GetProperties(_resizeComponents[0].resizeControl)["Left"];
                        for (int i = 0; i < _resizeComponents.Length; i++)
                        {
                            if (propWidth != null && ((Control)_resizeComponents[i].resizeControl).Width != _resizeComponents[i].resizeBounds.Width)
                            {
                                propWidth.SetValue(_resizeComponents[i].resizeControl, ((Control)_resizeComponents[i].resizeControl).Width);
                            }

                            if (propHeight != null && ((Control)_resizeComponents[i].resizeControl).Height != _resizeComponents[i].resizeBounds.Height)
                            {
                                propHeight.SetValue(_resizeComponents[i].resizeControl, ((Control)_resizeComponents[i].resizeControl).Height);
                            }

                            if (propTop != null && ((Control)_resizeComponents[i].resizeControl).Top != _resizeComponents[i].resizeBounds.Y)
                            {
                                propTop.SetValue(_resizeComponents[i].resizeControl, ((Control)_resizeComponents[i].resizeControl).Top);
                            }

                            if (propLeft != null && ((Control)_resizeComponents[i].resizeControl).Left != _resizeComponents[i].resizeBounds.X)
                            {
                                propLeft.SetValue(_resizeComponents[i].resizeControl, ((Control)_resizeComponents[i].resizeControl).Left);
                            }

                            if (_resizeComponents[i].resizeControl == _primaryControl && _statusCommandUI != null)
                            {
                                _statusCommandUI.SetStatusInformation(_primaryControl);
                            }
                        }
                    }
                }

                if (_resizeTransaction != null)
                {
                    DesignerTransaction t = _resizeTransaction;
                    _resizeTransaction = null;
                    using (t)
                    {
                        t.Commit();
                    }
                }
            }
            finally
            {
                // This pops us off the stack, re-enables adorners and clears the "dragging" flag.
                OnLoseCapture(g, EventArgs.Empty);
            }

            return false;
        }
    }
}
