// 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.

#nullable disable

using System.ComponentModel;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Text;
using System.Windows.Forms.Layout;

namespace System.Windows.Forms
{
    public abstract class ToolStripRenderer
    {
        private static readonly object EventRenderSplitButtonBackground = new object();
        private static readonly object EventRenderItemBackground = new object();
        private static readonly object EventRenderItemImage = new object();
        private static readonly object EventRenderItemText = new object();
        private static readonly object EventRenderToolStripBackground = new object();
        private static readonly object EventRenderGrip = new object();
        private static readonly object EventRenderButtonBackground = new object();
        private static readonly object EventRenderLabelBackground = new object();
        private static readonly object EventRenderMenuItemBackground = new object();
        private static readonly object EventRenderDropDownButtonBackground = new object();
        private static readonly object EventRenderOverflowButtonBackground = new object();
        private static readonly object EventRenderImageMargin = new object();
        private static readonly object EventRenderBorder = new object();
        private static readonly object EventRenderArrow = new object();
        private static readonly object EventRenderToolStripStatusLabelBackground = new object();
        private static readonly object EventRenderSeparator = new object();
        private static readonly object EventRenderItemCheck = new object();
        private static readonly object EventRenderToolStripPanelBackground = new object();
        private static readonly object EventRenderToolStripContentPanelBackground = new object();

        private static readonly object EventRenderStatusStripSizingGrip = new object();

        private static ColorMatrix disabledImageColorMatrix;

        private EventHandlerList events;
        private readonly bool isAutoGenerated;

        private static bool isScalingInitialized;
        internal int previousDeviceDpi = DpiHelper.DeviceDpi;

        // arrows are rendered as isosceles triangles, whose heights are half the base in order to have 45 degree angles
        // Offset2X is half of the base
        // Offset2Y is height of the isosceles triangle
        private const int OFFSET_2PIXELS = 2;
        private const int OFFSET_4PIXELS = 4;
        protected static int Offset2X = OFFSET_2PIXELS;
        protected static int Offset2Y = OFFSET_2PIXELS;
        private static int offset4X = OFFSET_4PIXELS;
        private static int offset4Y = OFFSET_4PIXELS;

        // this is used in building up the half pyramid of rectangles that are drawn in a
        // status strip sizing grip.
        private static readonly Rectangle[] baseSizeGripRectangles = new Rectangle[] { new Rectangle(8,0,2,2),
                                                                                new Rectangle(8,4,2,2),
                                                                                new Rectangle(8,8,2,2),
                                                                                new Rectangle(4,4,2,2),
                                                                                new Rectangle(4,8,2,2),
                                                                                new Rectangle(0,8,2,2) };

        protected ToolStripRenderer()
        {
        }

        internal ToolStripRenderer(bool isAutoGenerated)
        {
            this.isAutoGenerated = isAutoGenerated;
        }
        // this is used in building disabled images.
        private static ColorMatrix DisabledImageColorMatrix
        {
            get
            {
                if (disabledImageColorMatrix is null)
                {
                    // this is the result of a GreyScale matrix multiplied by a transparency matrix of .5

                    float[][] greyscale = new float[5][];
                    greyscale[0] = new float[5] { 0.2125f, 0.2125f, 0.2125f, 0, 0 };
                    greyscale[1] = new float[5] { 0.2577f, 0.2577f, 0.2577f, 0, 0 };
                    greyscale[2] = new float[5] { 0.0361f, 0.0361f, 0.0361f, 0, 0 };
                    greyscale[3] = new float[5] { 0, 0, 0, 1, 0 };
                    greyscale[4] = new float[5] { 0.38f, 0.38f, 0.38f, 0, 1 };

                    float[][] transparency = new float[5][];
                    transparency[0] = new float[5] { 1, 0, 0, 0, 0 };
                    transparency[1] = new float[5] { 0, 1, 0, 0, 0 };
                    transparency[2] = new float[5] { 0, 0, 1, 0, 0 };
                    transparency[3] = new float[5] { 0, 0, 0, .7F, 0 };
                    transparency[4] = new float[5] { 0, 0, 0, 0, 0 };

                    disabledImageColorMatrix = ControlPaint.MultiplyColorMatrix(transparency, greyscale);
                }

                return disabledImageColorMatrix;
            }
        }

        /// <summary>
        ///  Gets the list of event handlers that are attached to this component.
        /// </summary>
        private EventHandlerList Events
        {
            get
            {
                if (events is null)
                {
                    events = new EventHandlerList();
                }
                return events;
            }
        }

        internal bool IsAutoGenerated
        {
            get { return isAutoGenerated; }
        }

        // if we're in a low contrast, high resolution situation, use this renderer under the covers instead.
        internal virtual ToolStripRenderer RendererOverride
        {
            get
            {
                return null;
            }
        }

        ///  -----------------------------------------------------------------------------
        ///
        public event ToolStripArrowRenderEventHandler RenderArrow
        {
            add => AddHandler(EventRenderArrow, value);
            remove => RemoveHandler(EventRenderArrow, value);
        }

        /// <summary>
        ///  Occurs when the display style has changed
        /// </summary>
        public event ToolStripRenderEventHandler RenderToolStripBackground
        {
            add => AddHandler(EventRenderToolStripBackground, value);
            remove => RemoveHandler(EventRenderToolStripBackground, value);
        }

        public event ToolStripPanelRenderEventHandler RenderToolStripPanelBackground
        {
            add => AddHandler(EventRenderToolStripPanelBackground, value);
            remove => RemoveHandler(EventRenderToolStripPanelBackground, value);
        }

        public event ToolStripContentPanelRenderEventHandler RenderToolStripContentPanelBackground
        {
            add => AddHandler(EventRenderToolStripContentPanelBackground, value);
            remove => RemoveHandler(EventRenderToolStripContentPanelBackground, value);
        }

        /// <summary>
        ///  Occurs when the display style has changed
        /// </summary>
        public event ToolStripRenderEventHandler RenderToolStripBorder
        {
            add => AddHandler(EventRenderBorder, value);
            remove => RemoveHandler(EventRenderBorder, value);
        }

        /// <summary>
        ///  Occurs when the display style has changed
        /// </summary>
        public event ToolStripItemRenderEventHandler RenderButtonBackground
        {
            add => AddHandler(EventRenderButtonBackground, value);
            remove => RemoveHandler(EventRenderButtonBackground, value);
        }
        /// <summary>
        ///  Occurs when the display style has changed
        /// </summary>
        public event ToolStripItemRenderEventHandler RenderDropDownButtonBackground
        {
            add => AddHandler(EventRenderDropDownButtonBackground, value);
            remove => RemoveHandler(EventRenderDropDownButtonBackground, value);
        }

        /// <summary>
        ///  Occurs when the display style has changed
        /// </summary>
        public event ToolStripItemRenderEventHandler RenderOverflowButtonBackground
        {
            add => AddHandler(EventRenderOverflowButtonBackground, value);
            remove => RemoveHandler(EventRenderOverflowButtonBackground, value);
        }
        /// <summary>
        ///  Occurs when the display style has changed
        /// </summary>
        public event ToolStripGripRenderEventHandler RenderGrip
        {
            add => AddHandler(EventRenderGrip, value);
            remove => RemoveHandler(EventRenderGrip, value);
        }
        /// <summary>
        ///  Occurs when the display style has changed
        /// </summary>
        public event ToolStripItemRenderEventHandler RenderItemBackground
        {
            add => AddHandler(EventRenderItemBackground, value);
            remove => RemoveHandler(EventRenderItemBackground, value);
        }
        /// <summary>
        ///  Draws the split button
        /// </summary>
        public event ToolStripItemImageRenderEventHandler RenderItemImage
        {
            add => AddHandler(EventRenderItemImage, value);
            remove => RemoveHandler(EventRenderItemImage, value);
        }
        /// <summary>
        ///  Draws the checkmark
        /// </summary>
        public event ToolStripItemImageRenderEventHandler RenderItemCheck
        {
            add => AddHandler(EventRenderItemCheck, value);
            remove => RemoveHandler(EventRenderItemCheck, value);
        }
        /// <summary>
        ///  Draws the split button
        /// </summary>
        public event ToolStripItemTextRenderEventHandler RenderItemText
        {
            add => AddHandler(EventRenderItemText, value);
            remove => RemoveHandler(EventRenderItemText, value);
        }

        public event ToolStripRenderEventHandler RenderImageMargin
        {
            add => AddHandler(EventRenderImageMargin, value);
            remove => RemoveHandler(EventRenderImageMargin, value);
        }
        /// <summary>
        ///  Occurs when the display style has changed
        /// </summary>
        public event ToolStripItemRenderEventHandler RenderLabelBackground
        {
            add => AddHandler(EventRenderLabelBackground, value);
            remove => RemoveHandler(EventRenderLabelBackground, value);
        }
        /// <summary>
        ///  Occurs when the display style has changed
        /// </summary>
        public event ToolStripItemRenderEventHandler RenderMenuItemBackground
        {
            add => AddHandler(EventRenderMenuItemBackground, value);
            remove => RemoveHandler(EventRenderMenuItemBackground, value);
        }

        /// <summary>
        ///  Draws the split button
        /// </summary>
        public event ToolStripItemRenderEventHandler RenderToolStripStatusLabelBackground
        {
            add => AddHandler(EventRenderToolStripStatusLabelBackground, value);
            remove => RemoveHandler(EventRenderToolStripStatusLabelBackground, value);
        }

        /// <summary>
        ///  Occurs when the display style has changed
        /// </summary>
        public event ToolStripRenderEventHandler RenderStatusStripSizingGrip
        {
            add => AddHandler(EventRenderStatusStripSizingGrip, value);
            remove => RemoveHandler(EventRenderStatusStripSizingGrip, value);
        }

        /// <summary>
        ///  Draws the split button
        /// </summary>
        public event ToolStripItemRenderEventHandler RenderSplitButtonBackground
        {
            add => AddHandler(EventRenderSplitButtonBackground, value);
            remove => RemoveHandler(EventRenderSplitButtonBackground, value);
        }

        public event ToolStripSeparatorRenderEventHandler RenderSeparator
        {
            add => AddHandler(EventRenderSeparator, value);
            remove => RemoveHandler(EventRenderSeparator, value);
        }

        #region EventHandlerSecurity
        ///  -----------------------------------------------------------------------------
        ///
        private void AddHandler(object key, Delegate value)
        {
            Events.AddHandler(key, value);
        }

        private void RemoveHandler(object key, Delegate value)
        {
            Events.RemoveHandler(key, value);
        }
        #endregion

        public static Image CreateDisabledImage(Image normalImage)
        {
            return CreateDisabledImage(normalImage, null);
        }

        public void DrawArrow(ToolStripArrowRenderEventArgs e)
        {
            OnRenderArrow(e);

            if (Events[EventRenderArrow] is ToolStripArrowRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        /// <summary>
        ///  Draw the background color
        /// </summary>
        public void DrawToolStripBackground(ToolStripRenderEventArgs e)
        {
            OnRenderToolStripBackground(e);

            if (Events[EventRenderToolStripBackground] is ToolStripRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        /// <summary>
        ///  Draw the background color
        /// </summary>
        public void DrawGrip(ToolStripGripRenderEventArgs e)
        {
            OnRenderGrip(e);
            if (Events[EventRenderGrip] is ToolStripGripRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        /// <summary>
        ///  Draw the item's background.
        /// </summary>
        public void DrawItemBackground(ToolStripItemRenderEventArgs e)
        {
            OnRenderItemBackground(e);

            if (Events[EventRenderItemBackground] is ToolStripItemRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        /// <summary>
        ///  Draw the background color
        /// </summary>
        public void DrawImageMargin(ToolStripRenderEventArgs e)
        {
            OnRenderImageMargin(e);

            if (Events[EventRenderImageMargin] is ToolStripRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        /// <summary>
        ///  Draw the background color
        /// </summary>
        public void DrawLabelBackground(ToolStripItemRenderEventArgs e)
        {
            OnRenderLabelBackground(e);
            if (Events[EventRenderLabelBackground] is ToolStripItemRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        /// <summary>
        ///  Draw the item's background.
        /// </summary>
        public void DrawButtonBackground(ToolStripItemRenderEventArgs e)
        {
            OnRenderButtonBackground(e);

            if (Events[EventRenderButtonBackground] is ToolStripItemRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        public void DrawToolStripBorder(ToolStripRenderEventArgs e)
        {
            OnRenderToolStripBorder(e);

            if (Events[EventRenderBorder] is ToolStripRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        /// <summary>
        ///  Draw the item's background.
        /// </summary>
        public void DrawDropDownButtonBackground(ToolStripItemRenderEventArgs e)
        {
            OnRenderDropDownButtonBackground(e);

            if (Events[EventRenderDropDownButtonBackground] is ToolStripItemRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        /// <summary>
        ///  Draw the item's background.
        /// </summary>
        public void DrawOverflowButtonBackground(ToolStripItemRenderEventArgs e)
        {
            OnRenderOverflowButtonBackground(e);

            if (Events[EventRenderOverflowButtonBackground] is ToolStripItemRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        /// <summary>
        ///  Draw image
        /// </summary>
        public void DrawItemImage(ToolStripItemImageRenderEventArgs e)
        {
            OnRenderItemImage(e);

            if (Events[EventRenderItemImage] is ToolStripItemImageRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        /// <summary>
        ///  Draw image
        /// </summary>
        public void DrawItemCheck(ToolStripItemImageRenderEventArgs e)
        {
            OnRenderItemCheck(e);

            if (Events[EventRenderItemCheck] is ToolStripItemImageRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        /// <summary>
        ///  Draw text
        /// </summary>
        public void DrawItemText(ToolStripItemTextRenderEventArgs e)
        {
            OnRenderItemText(e);

            if (Events[EventRenderItemText] is ToolStripItemTextRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        /// <summary>
        ///  Draw the item's background.
        /// </summary>
        public void DrawMenuItemBackground(ToolStripItemRenderEventArgs e)
        {
            OnRenderMenuItemBackground(e);

            if (Events[EventRenderMenuItemBackground] is ToolStripItemRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        /// <summary>
        ///  Draw the background color
        /// </summary>
        public void DrawSplitButton(ToolStripItemRenderEventArgs e)
        {
            OnRenderSplitButtonBackground(e);

            if (Events[EventRenderSplitButtonBackground] is ToolStripItemRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        /// <summary>
        ///  Draw the background color
        /// </summary>
        public void DrawToolStripStatusLabelBackground(ToolStripItemRenderEventArgs e)
        {
            OnRenderToolStripStatusLabelBackground(e);

            if (Events[EventRenderToolStripStatusLabelBackground] is ToolStripItemRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        //
        public void DrawStatusStripSizingGrip(ToolStripRenderEventArgs e)
        {
            OnRenderStatusStripSizingGrip(e);

            if (Events[EventRenderStatusStripSizingGrip] is ToolStripRenderEventHandler eh)
            {
                eh(this, e);
            }
        }
        /// <summary>
        ///  Draw the separator
        /// </summary>
        public void DrawSeparator(ToolStripSeparatorRenderEventArgs e)
        {
            OnRenderSeparator(e);
            if (Events[EventRenderSeparator] is ToolStripSeparatorRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        public void DrawToolStripPanelBackground(ToolStripPanelRenderEventArgs e)
        {
            OnRenderToolStripPanelBackground(e);
            if (Events[EventRenderToolStripPanelBackground] is ToolStripPanelRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        public void DrawToolStripContentPanelBackground(ToolStripContentPanelRenderEventArgs e)
        {
            OnRenderToolStripContentPanelBackground(e);
            if (Events[EventRenderToolStripContentPanelBackground] is ToolStripContentPanelRenderEventHandler eh)
            {
                eh(this, e);
            }
        }

        // consider make public
        internal virtual Region GetTransparentRegion(ToolStrip toolStrip)
        {
            return null;
        }

        protected internal virtual void Initialize(ToolStrip toolStrip)
        {
        }

        protected internal virtual void InitializePanel(ToolStripPanel toolStripPanel)
        {
        }

        protected internal virtual void InitializeContentPanel(ToolStripContentPanel contentPanel)
        {
        }

        protected internal virtual void InitializeItem(ToolStripItem item)
        {
        }

        protected static void ScaleArrowOffsetsIfNeeded()
        {
            if (isScalingInitialized)
            {
                return;
            }

            if (DpiHelper.IsScalingRequired)
            {
                Offset2X = DpiHelper.LogicalToDeviceUnitsX(OFFSET_2PIXELS);
                Offset2Y = DpiHelper.LogicalToDeviceUnitsY(OFFSET_2PIXELS);
                offset4X = DpiHelper.LogicalToDeviceUnitsX(OFFSET_4PIXELS);
                offset4Y = DpiHelper.LogicalToDeviceUnitsY(OFFSET_4PIXELS);
            }
            isScalingInitialized = true;
        }

        protected static void ScaleArrowOffsetsIfNeeded(int dpi)
        {
            Offset2X = DpiHelper.LogicalToDeviceUnits(OFFSET_2PIXELS, dpi);
            Offset2Y = DpiHelper.LogicalToDeviceUnits(OFFSET_2PIXELS, dpi);
            offset4X = DpiHelper.LogicalToDeviceUnits(OFFSET_4PIXELS, dpi);
            offset4Y = DpiHelper.LogicalToDeviceUnits(OFFSET_4PIXELS, dpi);
        }

        protected virtual void OnRenderArrow(ToolStripArrowRenderEventArgs e)
        {
            if (e is null)
            {
                throw new ArgumentNullException(nameof(e));
            }

            if (RendererOverride != null)
            {
                RendererOverride.OnRenderArrow(e);
                return;
            }

            Graphics g = e.Graphics;
            Rectangle dropDownRect = e.ArrowRectangle;
            using (var brush = e.ArrowColor.GetCachedSolidBrushScope())
            {
                Point middle = new Point(dropDownRect.Left + dropDownRect.Width / 2, dropDownRect.Top + dropDownRect.Height / 2);
                // if the width is odd - favor pushing it over one pixel right.
                //middle.X += (dropDownRect.Width % 2);

                Point[] arrow = null;

                // We need the Elvis operator here, since at design time at this point Item can be null.
                if (e.Item?.DeviceDpi != previousDeviceDpi && DpiHelper.IsPerMonitorV2Awareness)
                {
                    previousDeviceDpi = e.Item.DeviceDpi;
                    ScaleArrowOffsetsIfNeeded(e.Item.DeviceDpi);
                }
                else
                {
                    ScaleArrowOffsetsIfNeeded();
                }

                // using (offset4X - Offset2X) instead of (Offset2X) to compensate for rounding error in scaling
                int horizontalOffset = DpiHelper.IsScalingRequirementMet ? offset4X - Offset2X : Offset2X;

                switch (e.Direction)
                {
                    case ArrowDirection.Up:

                        arrow = new Point[] {
                                 new Point(middle.X - Offset2X, middle.Y + 1),
                                 new Point(middle.X + Offset2X + 1, middle.Y + 1),
                                 new Point(middle.X, middle.Y - Offset2Y)};

                        break;
                    case ArrowDirection.Left:
                        arrow = new Point[] {
                                 new Point(middle.X + Offset2X, middle.Y - offset4Y),
                                 new Point(middle.X + Offset2X, middle.Y + offset4Y),
                                 new Point(middle.X - horizontalOffset, middle.Y)};

                        break;
                    case ArrowDirection.Right:
                        arrow = new Point[] {
                                 new Point(middle.X - Offset2X, middle.Y - offset4Y),
                                 new Point(middle.X - Offset2X, middle.Y + offset4Y),
                                 new Point(middle.X + horizontalOffset, middle.Y)};

                        break;
                    case ArrowDirection.Down:
                    default:
                        arrow = new Point[] {
                             new Point(middle.X - Offset2X, middle.Y - 1),
                             new Point(middle.X + Offset2X + 1, middle.Y - 1),
                             new Point(middle.X, middle.Y + Offset2Y) };
                        break;
                }
                g.FillPolygon(brush, arrow);
            }
        }

        /// <summary>
        ///  Draw the ToolStrip background.  ToolStrip users should override this if they want to draw differently.
        /// </summary>
        protected virtual void OnRenderToolStripBackground(ToolStripRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                RendererOverride.OnRenderToolStripBackground(e);
                return;
            }
        }

        /// <summary>
        ///  Draw the border around the ToolStrip.  This should be done as the last step.
        /// </summary>
        protected virtual void OnRenderToolStripBorder(ToolStripRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                RendererOverride.OnRenderToolStripBorder(e);
                return;
            }
        }

        /// <summary>
        ///  Draw the grip.  ToolStrip users should override this if they want to draw differently.
        /// </summary>
        protected virtual void OnRenderGrip(ToolStripGripRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                RendererOverride.OnRenderGrip(e);
                return;
            }
        }

        /// <summary>
        ///  Draw the items background
        /// </summary>
        protected virtual void OnRenderItemBackground(ToolStripItemRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                RendererOverride.OnRenderItemBackground(e);
                return;
            }
        }

        /// <summary>
        ///  Draw the items background
        /// </summary>
        protected virtual void OnRenderImageMargin(ToolStripRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                RendererOverride.OnRenderImageMargin(e);
                return;
            }
        }
        /// <summary>
        ///  Draw the button background
        /// </summary>
        protected virtual void OnRenderButtonBackground(ToolStripItemRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                RendererOverride.OnRenderButtonBackground(e);
                return;
            }
        }

        /// <summary>
        ///  Draw the button background
        /// </summary>
        protected virtual void OnRenderDropDownButtonBackground(ToolStripItemRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                RendererOverride.OnRenderDropDownButtonBackground(e);
                return;
            }
        }

        /// <summary>
        ///  Draw the button background
        /// </summary>
        protected virtual void OnRenderOverflowButtonBackground(ToolStripItemRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                RendererOverride.OnRenderOverflowButtonBackground(e);
                return;
            }
        }
        /// <summary>
        ///  Draw the item'si mage.  ToolStrip users should override this function to change the
        ///  drawing of all images.
        /// </summary>
        protected virtual void OnRenderItemImage(ToolStripItemImageRenderEventArgs e)
        {
            if (e is null)
            {
                throw new ArgumentNullException(nameof(e));
            }

            if (RendererOverride != null)
            {
                RendererOverride.OnRenderItemImage(e);
                return;
            }

            Rectangle imageRect = e.ImageRectangle;
            Image image = e.Image;

            if (imageRect != Rectangle.Empty && image != null)
            {
                bool disposeImage = false;
                if (e.ShiftOnPress && e.Item.Pressed)
                {
                    imageRect.X++;
                }
                if (!e.Item.Enabled)
                {
                    image = CreateDisabledImage(image, e.ImageAttributes);
                    disposeImage = true;
                }
                if (e.Item.ImageScaling == ToolStripItemImageScaling.None)
                {
                    e.Graphics.DrawImage(image, imageRect, new Rectangle(Point.Empty, imageRect.Size), GraphicsUnit.Pixel);
                }
                else
                {
                    e.Graphics.DrawImage(image, imageRect);
                }

                if (disposeImage)
                {
                    image.Dispose();
                }
            }
        }

        protected virtual void OnRenderItemCheck(ToolStripItemImageRenderEventArgs e)
        {
            if (e is null)
            {
                throw new ArgumentNullException(nameof(e));
            }

            if (RendererOverride != null)
            {
                RendererOverride.OnRenderItemCheck(e);
                return;
            }

            Rectangle imageRect = e.ImageRectangle;
            Image image = e.Image;

            if (imageRect != Rectangle.Empty && image != null)
            {
                if (!e.Item.Enabled)
                {
                    image = CreateDisabledImage(image, e.ImageAttributes);
                }

                e.Graphics.DrawImage(image, imageRect, 0, 0, imageRect.Width,
                    imageRect.Height, GraphicsUnit.Pixel, e.ImageAttributes);
            }
        }

        /// <summary>
        ///  Draw the item's text.  ToolStrip users should override this function to change the
        ///  drawing of all text.
        /// </summary>
        protected virtual void OnRenderItemText(ToolStripItemTextRenderEventArgs e)
        {
            if (e is null)
            {
                throw new ArgumentNullException(nameof(e));
            }

            if (RendererOverride != null)
            {
                RendererOverride.OnRenderItemText(e);
                return;
            }

            ToolStripItem item = e.Item;
            Graphics g = e.Graphics;
            Color textColor = e.TextColor;
            Font textFont = e.TextFont;
            string text = e.Text;
            Rectangle textRect = e.TextRectangle;
            TextFormatFlags textFormat = e.TextFormat;
            // if we're disabled draw in a different color.
            textColor = (item.Enabled) ? textColor : SystemColors.GrayText;

            if (e.TextDirection != ToolStripTextDirection.Horizontal && textRect.Width > 0 && textRect.Height > 0)
            {
                // Perf: this is a bit heavy handed.. perhaps we can share the bitmap.
                Size textSize = LayoutUtils.FlipSize(textRect.Size);
                using (Bitmap textBmp = new Bitmap(textSize.Width, textSize.Height, PixelFormat.Format32bppPArgb))
                {
                    using (Graphics textGraphics = Graphics.FromImage(textBmp))
                    {
                        // now draw the text..
                        textGraphics.TextRenderingHint = TextRenderingHint.AntiAlias;
                        TextRenderer.DrawText(textGraphics, text, textFont, new Rectangle(Point.Empty, textSize), textColor, textFormat);
                        textBmp.RotateFlip((e.TextDirection == ToolStripTextDirection.Vertical90) ? RotateFlipType.Rotate90FlipNone : RotateFlipType.Rotate270FlipNone);
                        g.DrawImage(textBmp, textRect);
                    }
                }
            }
            else
            {
                TextRenderer.DrawText(g, text, textFont, textRect, textColor, textFormat);
            }
        }

        /// <summary>
        ///  Draw the button background
        /// </summary>
        protected virtual void OnRenderLabelBackground(ToolStripItemRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                RendererOverride.OnRenderLabelBackground(e);
                return;
            }
        }
        /// <summary>
        ///  Draw the items background
        /// </summary>
        protected virtual void OnRenderMenuItemBackground(ToolStripItemRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                RendererOverride.OnRenderMenuItemBackground(e);
                return;
            }
        }

        /// <summary>
        ///  Draws a toolbar separator. ToolStrip users should override this function to change the
        ///  drawing of all separators.
        /// </summary>
        protected virtual void OnRenderSeparator(ToolStripSeparatorRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                RendererOverride.OnRenderSeparator(e);
                return;
            }
        }

        protected virtual void OnRenderToolStripPanelBackground(ToolStripPanelRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                RendererOverride.OnRenderToolStripPanelBackground(e);
                return;
            }
        }

        protected virtual void OnRenderToolStripContentPanelBackground(ToolStripContentPanelRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                RendererOverride.OnRenderToolStripContentPanelBackground(e);
                return;
            }
        }

        protected virtual void OnRenderToolStripStatusLabelBackground(ToolStripItemRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                RendererOverride.OnRenderToolStripStatusLabelBackground(e);
                return;
            }
        }

        protected virtual void OnRenderStatusStripSizingGrip(ToolStripRenderEventArgs e)
        {
            if (e is null)
            {
                throw new ArgumentNullException(nameof(e));
            }

            if (RendererOverride != null)
            {
                RendererOverride.OnRenderStatusStripSizingGrip(e);
                return;
            }

            Graphics g = e.Graphics;

            // we have a set of stock rectangles.  Translate them over to where the grip is to be drawn
            // for the white set, then translate them up and right one pixel for the grey.

            if (e.ToolStrip is StatusStrip statusStrip)
            {
                Rectangle sizeGripBounds = statusStrip.SizeGripBounds;

                if (!LayoutUtils.IsZeroWidthOrHeight(sizeGripBounds))
                {
                    Rectangle[] whiteRectangles = new Rectangle[baseSizeGripRectangles.Length];
                    Rectangle[] greyRectangles = new Rectangle[baseSizeGripRectangles.Length];

                    for (int i = 0; i < baseSizeGripRectangles.Length; i++)
                    {
                        Rectangle baseRect = baseSizeGripRectangles[i];
                        if (statusStrip.RightToLeft == RightToLeft.Yes)
                        {
                            baseRect.X = sizeGripBounds.Width - baseRect.X - baseRect.Width;
                        }
                        baseRect.Offset(sizeGripBounds.X, sizeGripBounds.Bottom - 12 /*height of pyramid (10px) + 2px padding from bottom*/);
                        whiteRectangles[i] = baseRect;
                        if (statusStrip.RightToLeft == RightToLeft.Yes)
                        {
                            baseRect.Offset(1, -1);
                        }
                        else
                        {
                            baseRect.Offset(-1, -1);
                        }
                        greyRectangles[i] = baseRect;
                    }

                    g.FillRectangles(SystemBrushes.ButtonHighlight, whiteRectangles);
                    g.FillRectangles(SystemBrushes.ButtonShadow, greyRectangles);
                }
            }
        }
        /// <summary>
        ///  Draw the item's background.
        /// </summary>
        protected virtual void OnRenderSplitButtonBackground(ToolStripItemRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                RendererOverride.OnRenderSplitButtonBackground(e);
                return;
            }
        }

        // Only paint background effects if no backcolor has been set or no background image has been set.
        internal bool ShouldPaintBackground(Control control)
        {
            return (control.RawBackColor == Color.Empty && control.BackgroundImage is null);
        }

        private static Image CreateDisabledImage(Image normalImage, ImageAttributes imgAttrib)
        {
            if (normalImage is null)
            {
                throw new ArgumentNullException(nameof(normalImage));
            }

            if (imgAttrib is null)
            {
                imgAttrib = new ImageAttributes();
            }

            imgAttrib.ClearColorKey();
            imgAttrib.SetColorMatrix(DisabledImageColorMatrix);

            Size size = normalImage.Size;
            Bitmap disabledBitmap = new Bitmap(size.Width, size.Height);
            using (Graphics graphics = Graphics.FromImage(disabledBitmap))
            {
                graphics.DrawImage(normalImage,
                                   new Rectangle(0, 0, size.Width, size.Height),
                                   0, 0, size.Width, size.Height,
                                   GraphicsUnit.Pixel,
                                   imgAttrib);
            }

            return disabledBitmap;
        }
    }
}
