// 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.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms.Layout;

namespace System.Windows.Forms
{
    /// <summary>
    ///  Summary description for ProfessionalToolStripRenderer.
    /// </summary>
    public class ToolStripProfessionalRenderer : ToolStripRenderer
    {
        private const int GRIP_PADDING = 4;
        private int gripPadding = GRIP_PADDING;

        private const int ICON_WELL_GRADIENT_WIDTH = 12;
        private int iconWellGradientWidth = ICON_WELL_GRADIENT_WIDTH;

        private static readonly Size onePix = new Size(1, 1);

        private bool isScalingInitialized;
        private const int OVERFLOW_BUTTON_WIDTH = 12;
        private const int OVERFLOW_ARROW_WIDTH = 9;
        private const int OVERFLOW_ARROW_HEIGHT = 5;
        private const int OVERFLOW_ARROW_OFFSETY = 8;
        private int overflowButtonWidth = OVERFLOW_BUTTON_WIDTH;
        private int overflowArrowWidth = OVERFLOW_ARROW_WIDTH;
        private int overflowArrowHeight = OVERFLOW_ARROW_HEIGHT;
        private int overflowArrowOffsetY = OVERFLOW_ARROW_OFFSETY;

        private const int DROP_DOWN_MENU_ITEM_PAINT_PADDING_SIZE = 1;
        private Padding scaledDropDownMenuItemPaintPadding = new Padding(DROP_DOWN_MENU_ITEM_PAINT_PADDING_SIZE + 1, 0, DROP_DOWN_MENU_ITEM_PAINT_PADDING_SIZE, 0);
        private readonly ProfessionalColorTable professionalColorTable;
        private bool roundedEdges = true;
        private ToolStripRenderer toolStripHighContrastRenderer;
        private ToolStripRenderer toolStripLowResolutionRenderer;

        public ToolStripProfessionalRenderer()
        {
        }
        internal ToolStripProfessionalRenderer(bool isDefault) : base(isDefault)
        {
        }

        public ToolStripProfessionalRenderer(ProfessionalColorTable professionalColorTable)
        {
            this.professionalColorTable = professionalColorTable;
        }

        public ProfessionalColorTable ColorTable
        {
            get
            {
                if (professionalColorTable is null)
                {
                    return ProfessionalColors.ColorTable;
                }
                return professionalColorTable;
            }
        }

        internal override ToolStripRenderer RendererOverride
        {
            get
            {
                if (DisplayInformation.HighContrast)
                {
                    return HighContrastRenderer;
                }
                if (DisplayInformation.LowResolution)
                {
                    return LowResolutionRenderer;
                }
                return null;
            }
        }

        internal ToolStripRenderer HighContrastRenderer
        {
            get
            {
                if (toolStripHighContrastRenderer is null)
                {
                    toolStripHighContrastRenderer = new ToolStripHighContrastRenderer(/*renderLikeSystem*/false);
                }
                return toolStripHighContrastRenderer;
            }
        }

        internal ToolStripRenderer LowResolutionRenderer
        {
            get
            {
                if (toolStripLowResolutionRenderer is null)
                {
                    toolStripLowResolutionRenderer = new ToolStripProfessionalLowResolutionRenderer();
                }
                return toolStripLowResolutionRenderer;
            }
        }

        public bool RoundedEdges
        {
            get
            {
                return roundedEdges;
            }
            set
            {
                roundedEdges = value;
            }
        }

        private bool UseSystemColors
        {
            get { return (ColorTable.UseSystemColors || !ToolStripManager.VisualStylesEnabled); }
        }

        protected override void OnRenderToolStripBackground(ToolStripRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                base.OnRenderToolStripBackground(e);
                return;
            }

            ToolStrip toolStrip = e.ToolStrip;

            if (!ShouldPaintBackground(toolStrip))
            {
                return;
            }

            if (toolStrip is ToolStripDropDown)
            {
                RenderToolStripDropDownBackground(e);
            }
            else if (toolStrip is MenuStrip)
            {
                RenderMenuStripBackground(e);
            }
            else if (toolStrip is StatusStrip)
            {
                RenderStatusStripBackground(e);
            }
            else
            {
                RenderToolStripBackgroundInternal(e);
            }
        }

        protected override void OnRenderOverflowButtonBackground(ToolStripItemRenderEventArgs e) {
            ScaleObjectSizesIfNeeded(e.ToolStrip.DeviceDpi);

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

            ToolStripItem item = e.Item;
            Graphics g = e.Graphics;

            // fill in the background colors
            bool rightToLeft = (item.RightToLeft == RightToLeft.Yes);
            RenderOverflowBackground(e, rightToLeft);

            bool horizontal = (e.ToolStrip.Orientation == Orientation.Horizontal);

            Rectangle overflowArrowRect = Rectangle.Empty;
            if (rightToLeft)
            {
                overflowArrowRect = new Rectangle(0, item.Height - overflowArrowOffsetY, overflowArrowWidth, overflowArrowHeight);
            }
            else
            {
                overflowArrowRect = new Rectangle(item.Width - overflowButtonWidth, item.Height - overflowArrowOffsetY, overflowArrowWidth, overflowArrowHeight);
            }

            ArrowDirection direction = (horizontal) ? ArrowDirection.Down : ArrowDirection.Right;

            // in RTL the white highlight goes BEFORE the black triangle.
            int rightToLeftShift = (rightToLeft && horizontal) ? -1 : 1;

            // draw highlight
            overflowArrowRect.Offset(1 * rightToLeftShift, 1);
            RenderArrowInternal(g, overflowArrowRect, direction, SystemBrushes.ButtonHighlight);

            // draw black triangle
            overflowArrowRect.Offset(-1 * rightToLeftShift, -1);
            Point middle = RenderArrowInternal(g, overflowArrowRect, direction, SystemBrushes.ControlText);

            // draw lines
            if (horizontal)
            {
                rightToLeftShift = (rightToLeft) ? -2 : 0;
                // width of the both lines is 1 pixel and lines are drawn next to each other, this the highlight line is 1 pixel below the black line
                g.DrawLine(SystemPens.ControlText,
                    middle.X - Offset2X,
                    overflowArrowRect.Y - Offset2Y,
                    middle.X + Offset2X,
                    overflowArrowRect.Y - Offset2Y);
                g.DrawLine(SystemPens.ButtonHighlight,
                    middle.X - Offset2X + 1 + rightToLeftShift,
                    overflowArrowRect.Y - Offset2Y + 1,
                    middle.X + Offset2X + 1 + rightToLeftShift,
                    overflowArrowRect.Y - Offset2Y + 1);
            }
            else
            {
                g.DrawLine(SystemPens.ControlText,
                    overflowArrowRect.X,
                    middle.Y - Offset2Y,
                    overflowArrowRect.X,
                    middle.Y + Offset2Y);
                g.DrawLine(SystemPens.ButtonHighlight,
                    overflowArrowRect.X + 1,
                    middle.Y - Offset2Y + 1,
                    overflowArrowRect.X + 1,
                    middle.Y + Offset2Y + 1);
            }
        }

        protected override void OnRenderDropDownButtonBackground(ToolStripItemRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                base.OnRenderDropDownButtonBackground(e);
                return;
            }

            if (e.Item is ToolStripDropDownItem item && item.Pressed && item.HasDropDownItems)
            {
                Rectangle bounds = new Rectangle(Point.Empty, item.Size);

                RenderPressedGradient(e.Graphics, bounds);
            }
            else
            {
                RenderItemInternal(e, /*useHotBorder =*/true);
            }
        }

        protected override void OnRenderSeparator(ToolStripSeparatorRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                base.OnRenderSeparator(e);
                return;
            }

            RenderSeparatorInternal(e.Graphics, e.Item, new Rectangle(Point.Empty, e.Item.Size), e.Vertical);
        }

        protected override void OnRenderSplitButtonBackground(ToolStripItemRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                base.OnRenderSplitButtonBackground(e);
                return;
            }

            Graphics g = e.Graphics;

            if (!(e.Item is ToolStripSplitButton item))
            {
                return;
            }

            Rectangle bounds = new Rectangle(Point.Empty, item.Size);
            if (item.BackgroundImage != null)
            {
                Rectangle fillRect = (item.Selected) ? item.ContentRectangle : bounds;
                ControlPaint.DrawBackgroundImage(g, item.BackgroundImage, item.BackColor, item.BackgroundImageLayout, bounds, fillRect);
            }

            bool buttonPressedOrSelected = (item.Pressed || item.ButtonPressed || item.Selected || item.ButtonSelected);

            if (buttonPressedOrSelected)
            {
                RenderItemInternal(e, useHotBorder: true);
            }

            if (item.ButtonPressed)
            {
                Rectangle buttonBounds = item.ButtonBounds;
                // We subtract 1 from each side except the right.
                // This is because we've already drawn the border, and we don't
                // want to draw over it.  We don't do the right edge, because we
                // drew the border around the whole control, not the button.
                Padding deflatePadding = item.RightToLeft == RightToLeft.Yes ? new Padding(0, 1, 1, 1) : new Padding(1, 1, 0, 1);
                buttonBounds = LayoutUtils.DeflateRect(buttonBounds, deflatePadding);
                RenderPressedButtonFill(g, buttonBounds);
            }
            else if (item.Pressed)
            {
                RenderPressedGradient(e.Graphics, bounds);
            }
            Rectangle dropDownRect = item.DropDownButtonBounds;

            if (buttonPressedOrSelected && !item.Pressed)
            {
                using var brush = ColorTable.ButtonSelectedBorder.GetCachedSolidBrushScope();
                g.FillRectangle(brush, item.SplitterBounds);
            }

            DrawArrow(new ToolStripArrowRenderEventArgs(g, item, dropDownRect, SystemColors.ControlText, ArrowDirection.Down));
        }

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

            RenderLabelInternal(e);
            ToolStripStatusLabel item = e.Item as ToolStripStatusLabel;
            ControlPaint.DrawBorder3D(e.Graphics, new Rectangle(0, 0, item.Width, item.Height), item.BorderStyle, (Border3DSide)item.BorderSides);
        }

        protected override void OnRenderLabelBackground(ToolStripItemRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                base.OnRenderLabelBackground(e);
                return;
            }

            RenderLabelInternal(e);
        }

        protected override void OnRenderButtonBackground(ToolStripItemRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                base.OnRenderButtonBackground(e);
                return;
            }

            ToolStripButton item = e.Item as ToolStripButton;
            Graphics g = e.Graphics;
            Rectangle bounds = new Rectangle(Point.Empty, item.Size);

            if (item.CheckState == CheckState.Unchecked)
            {
                RenderItemInternal(e, useHotBorder: true);
            }
            else
            {
                Rectangle fillRect = (item.Selected) ? item.ContentRectangle : bounds;

                if (item.BackgroundImage != null)
                {
                    ControlPaint.DrawBackgroundImage(g, item.BackgroundImage, item.BackColor, item.BackgroundImageLayout, bounds, fillRect);
                }

                if (UseSystemColors)
                {
                    if (item.Selected)
                    {
                        RenderPressedButtonFill(g, bounds);
                    }
                    else
                    {
                        RenderCheckedButtonFill(g, bounds);
                    }

                    using var pen = ColorTable.ButtonSelectedBorder.GetCachedPenScope();
                    g.DrawRectangle(pen, bounds.X, bounds.Y, bounds.Width - 1, bounds.Height - 1);
                }
                else
                {
                    if (item.Selected)
                    {
                        RenderPressedButtonFill(g, bounds);
                    }
                    else
                    {
                        RenderCheckedButtonFill(g, bounds);
                    }

                    using var pen = ColorTable.ButtonSelectedBorder.GetCachedPenScope();
                    g.DrawRectangle(pen, bounds.X, bounds.Y, bounds.Width - 1, bounds.Height - 1);
                }
            }
        }

        protected override void OnRenderToolStripBorder(ToolStripRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                base.OnRenderToolStripBorder(e);
                return;
            }

            ToolStrip toolStrip = e.ToolStrip;
            Graphics g = e.Graphics;

            if (toolStrip is ToolStripDropDown)
            {
                RenderToolStripDropDownBorder(e);
            }
            else if (toolStrip is MenuStrip)
            {
            }
            else if (toolStrip is StatusStrip)
            {
                RenderStatusStripBorder(e);
            }
            else
            {
                Rectangle bounds = new Rectangle(Point.Empty, toolStrip.Size);

                // draw the shadow lines on the bottom and right
                using (var pen = ColorTable.ToolStripBorder.GetCachedPenScope())
                {
                    if (toolStrip.Orientation == Orientation.Horizontal)
                    {
                        // horizontal line at bottom
                        g.DrawLine(pen, bounds.Left, bounds.Height - 1, bounds.Right, bounds.Height - 1);
                        if (RoundedEdges)
                        {
                            // one pix corner rounding (right bottom)
                            g.DrawLine(pen, bounds.Width - 2, bounds.Height - 2, bounds.Width - 1, bounds.Height - 3);
                        }
                    }
                    else
                    {
                        // draw vertical line on the right
                        g.DrawLine(pen, bounds.Width - 1, 0, bounds.Width - 1, bounds.Height - 1);
                        if (RoundedEdges)
                        {
                            // one pix corner rounding (right bottom)
                            g.DrawLine(pen, bounds.Width - 2, bounds.Height - 2, bounds.Width - 1, bounds.Height - 3);
                        }
                    }
                }

                if (RoundedEdges)
                {
                    // OverflowButton rendering
                    if (toolStrip.OverflowButton.Visible)
                    {
                        RenderOverflowButtonEffectsOverBorder(e);
                    }
                    else
                    {
                        // Draw 1PX edging to round off the toolStrip
                        Rectangle edging = Rectangle.Empty;
                        if (toolStrip.Orientation == Orientation.Horizontal)
                        {
                            edging = new Rectangle(bounds.Width - 1, 3, 1, bounds.Height - 3);
                        }
                        else
                        {
                            edging = new Rectangle(3, bounds.Height - 1, bounds.Width - 3, bounds.Height - 1);
                        }
                        ScaleObjectSizesIfNeeded(toolStrip.DeviceDpi);
                        FillWithDoubleGradient(ColorTable.OverflowButtonGradientBegin, ColorTable.OverflowButtonGradientMiddle, ColorTable.OverflowButtonGradientEnd, e.Graphics, edging, iconWellGradientWidth, iconWellGradientWidth, LinearGradientMode.Vertical, /*flipHorizontal=*/false);
                        RenderToolStripCurve(e);
                    }
                }
            }
        }

        protected override void OnRenderGrip(ToolStripGripRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                base.OnRenderGrip(e);
                return;
            }

            ScaleObjectSizesIfNeeded(e.ToolStrip.DeviceDpi);

            Graphics g = e.Graphics;
            Rectangle bounds = e.GripBounds;
            ToolStrip toolStrip = e.ToolStrip;

            bool rightToLeft = (e.ToolStrip.RightToLeft == RightToLeft.Yes);

            int height = (toolStrip.Orientation == Orientation.Horizontal) ? bounds.Height : bounds.Width;
            int width = (toolStrip.Orientation == Orientation.Horizontal) ? bounds.Width : bounds.Height;

            int numRectangles = (height - (gripPadding * 2)) / 4;

            if (numRectangles > 0)
            {
                // a MenuStrip starts its grip lower and has fewer grip rectangles.
                int yOffset = (toolStrip is MenuStrip) ? 2 : 0;

                Rectangle[] shadowRects = new Rectangle[numRectangles];
                int startY = gripPadding + 1 + yOffset;
                int startX = (width / 2);

                for (int i = 0; i < numRectangles; i++)
                {
                    shadowRects[i] = (toolStrip.Orientation == Orientation.Horizontal) ?
                                        new Rectangle(startX, startY, 2, 2) :
                                        new Rectangle(startY, startX, 2, 2);

                    startY += 4;
                }

                // in RTL the GripLight rects should paint to the left of the GripDark rects.
                int xOffset = (rightToLeft) ? 1 : -1;

                if (rightToLeft)
                {
                    // scoot over the rects in RTL so they fit within the bounds.
                    for (int i = 0; i < numRectangles; i++)
                    {
                        shadowRects[i].Offset(-xOffset, 0);
                    }
                }

                using var gripLightBrush = ColorTable.GripLight.GetCachedSolidBrushScope();
                g.FillRectangles(gripLightBrush, shadowRects);

                for (int i = 0; i < numRectangles; i++)
                {
                    shadowRects[i].Offset(xOffset, -1);
                }

                using var gripDarkBrush = ColorTable.GripDark.GetCachedSolidBrushScope();
                g.FillRectangles(gripDarkBrush, shadowRects);
            }
        }

        protected override void OnRenderMenuItemBackground(ToolStripItemRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                base.OnRenderMenuItemBackground(e);
                return;
            }

            ToolStripItem item = e.Item;
            Graphics g = e.Graphics;
            Rectangle bounds = new Rectangle(Point.Empty, item.Size);

            if ((bounds.Width == 0) || (bounds.Height == 0))
            {
                return;  // can't new up a linear gradient brush with no dimension.
            }

            if (item is MdiControlStrip.SystemMenuItem)
            {
                return; // no highlights are painted behind a system menu item
            }

            if (item.IsOnDropDown) {
                ScaleObjectSizesIfNeeded(item.DeviceDpi);

                bounds = LayoutUtils.DeflateRect(bounds, scaledDropDownMenuItemPaintPadding);

                if (item.Selected)
                {
                    Color borderColor = ColorTable.MenuItemBorder;
                    if (item.Enabled)
                    {
                        if (UseSystemColors)
                        {
                            borderColor = SystemColors.Highlight;
                            RenderSelectedButtonFill(g, bounds);
                        }
                        else
                        {
                            using Brush b = new LinearGradientBrush(
                                bounds,
                                ColorTable.MenuItemSelectedGradientBegin,
                                ColorTable.MenuItemSelectedGradientEnd,
                                LinearGradientMode.Vertical);

                            g.FillRectangle(b, bounds);
                        }
                    }

                    // Draw selection border - always drawn regardless of Enabled.
                    using var pen = borderColor.GetCachedPenScope();
                    g.DrawRectangle(pen, bounds.X, bounds.Y, bounds.Width - 1, bounds.Height - 1);
                }
                else
                {
                    Rectangle fillRect = bounds;

                    if (item.BackgroundImage != null)
                    {
                        ControlPaint.DrawBackgroundImage(
                            g,
                            item.BackgroundImage,
                            item.BackColor,
                            item.BackgroundImageLayout,
                            bounds,
                            fillRect);
                    }
                    else if (item.Owner != null && item.BackColor != item.Owner.BackColor)
                    {
                        using var brush = item.BackColor.GetCachedSolidBrushScope();
                        g.FillRectangle(brush, fillRect);
                    }
                }
            }
            else
            {
                if (item.Pressed)
                {
                    // Toplevel toolstrip rendering
                    RenderPressedGradient(g, bounds);
                }
                else if (item.Selected)
                {
                    //Hot, Pressed behavior
                    // Fill with orange
                    Color borderColor = ColorTable.MenuItemBorder;

                    if (item.Enabled)
                    {
                        if (UseSystemColors)
                        {
                            borderColor = SystemColors.Highlight;
                            RenderSelectedButtonFill(g, bounds);
                        }
                        else
                        {
                            using Brush b = new LinearGradientBrush(
                                bounds,
                                ColorTable.MenuItemSelectedGradientBegin,
                                ColorTable.MenuItemSelectedGradientEnd,
                                LinearGradientMode.Vertical);

                            g.FillRectangle(b, bounds);
                        }
                    }

                    // Draw selection border - always drawn regardless of Enabled.
                    using var pen = borderColor.GetCachedPenScope();
                    g.DrawRectangle(pen, bounds.X, bounds.Y, bounds.Width - 1, bounds.Height - 1);
                }
                else
                {
                    Rectangle fillRect = bounds;

                    if (item.BackgroundImage != null)
                    {
                        ControlPaint.DrawBackgroundImage(g, item.BackgroundImage, item.BackColor, item.BackgroundImageLayout, bounds, fillRect);
                    }
                    else if (item.Owner != null && item.BackColor != item.Owner.BackColor)
                    {
                        using var brush = item.BackColor.GetCachedSolidBrushScope();
                        g.FillRectangle(brush, fillRect);
                    }
                }
            }
        }

        protected override void OnRenderArrow(ToolStripArrowRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                base.OnRenderArrow(e);
                return;
            }

            ToolStripItem item = e.Item;

            if (item is ToolStripDropDownItem)
            {
                e.DefaultArrowColor = (item.Enabled) ? SystemColors.ControlText : SystemColors.ControlDark;
            }

            base.OnRenderArrow(e);
        }

        protected override void OnRenderImageMargin(ToolStripRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                base.OnRenderImageMargin(e);
                return;
            }

            ScaleObjectSizesIfNeeded(e.ToolStrip.DeviceDpi);

            Graphics g = e.Graphics;
            Rectangle bounds = e.AffectedBounds;
            bounds.Y += 2;
            bounds.Height -= 4; /*shrink to accomodate 1PX line*/
            RightToLeft rightToLeft = e.ToolStrip.RightToLeft;
            Color begin = (rightToLeft == RightToLeft.No) ? ColorTable.ImageMarginGradientBegin : ColorTable.ImageMarginGradientEnd;
            Color end = (rightToLeft == RightToLeft.No) ? ColorTable.ImageMarginGradientEnd : ColorTable.ImageMarginGradientBegin;

            FillWithDoubleGradient(begin, ColorTable.ImageMarginGradientMiddle, end, e.Graphics, bounds, iconWellGradientWidth, iconWellGradientWidth, LinearGradientMode.Horizontal, /*flipHorizontal=*/(e.ToolStrip.RightToLeft == RightToLeft.Yes));
        }

        protected override void OnRenderItemText(ToolStripItemTextRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                base.OnRenderItemText(e);
                return;
            }

            if (e.Item is ToolStripMenuItem && (e.Item.Selected || e.Item.Pressed))
            {
                e.DefaultTextColor = e.Item.ForeColor;
            }

            base.OnRenderItemText(e);
        }

        protected override void OnRenderItemCheck(ToolStripItemImageRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                base.OnRenderItemCheck(e);
                return;
            }

            RenderCheckBackground(e);
            base.OnRenderItemCheck(e);
        }
        protected override void OnRenderItemImage(ToolStripItemImageRenderEventArgs e)
        {
            if (RendererOverride != null)
            {
                base.OnRenderItemImage(e);
                return;
            }

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

            if (e.Item is ToolStripMenuItem)
            {
                ToolStripMenuItem item = e.Item as ToolStripMenuItem;
                if (item.CheckState != CheckState.Unchecked)
                {
                    if (item.ParentInternal is ToolStripDropDownMenu dropDownMenu && !dropDownMenu.ShowCheckMargin && dropDownMenu.ShowImageMargin)
                    {
                        RenderCheckBackground(e);
                    }
                }
            }

            if (imageRect != Rectangle.Empty && image != null)
            {
                if (!e.Item.Enabled)
                {
                    base.OnRenderItemImage(e);
                    return;
                }

                // Since office images dont scoot one px we have to override all painting but enabled = false;
                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);
                }
            }
        }

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

            ToolStripPanel toolStripPanel = e.ToolStripPanel;

            if (!ShouldPaintBackground(toolStripPanel))
            {
                return;
            }
            // dont paint background effects
            e.Handled = true;

            RenderBackgroundGradient(e.Graphics, toolStripPanel, ColorTable.ToolStripPanelGradientBegin, ColorTable.ToolStripPanelGradientEnd);
        }

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

            ToolStripContentPanel toolStripContentPanel = e.ToolStripContentPanel;

            if (!ShouldPaintBackground(toolStripContentPanel))
            {
                return;
            }

            if (SystemInformation.InLockedTerminalSession())
            {
                return;
            }

            // dont paint background effects
            e.Handled = true;

            e.Graphics.Clear(ColorTable.ToolStripContentPanelGradientEnd);

            //        RenderBackgroundGradient(e.Graphics, toolStripContentPanel, ColorTable.ToolStripContentPanelGradientBegin, ColorTable.ToolStripContentPanelGradientEnd);
        }

        #region PrivatePaintHelpers

        // consider make public
        internal override Region GetTransparentRegion(ToolStrip toolStrip)
        {
            if (toolStrip is ToolStripDropDown || toolStrip is MenuStrip || toolStrip is StatusStrip)
            {
                return null;
            }
            if (!RoundedEdges)
            {
                return null;
            }
            Rectangle bounds = new Rectangle(Point.Empty, toolStrip.Size);

            // Render curve
            // eat away at the corners by drawing the parent background
            //
            if (toolStrip.ParentInternal != null)
            {
                //
                // Paint pieces of the parent here to give toolStrip rounded effect
                //
                Point topLeft = Point.Empty;
                Point topRight = new Point(bounds.Width - 1, 0);
                Point bottomLeft = new Point(0, bounds.Height - 1);
                Point bottomRight = new Point(bounds.Width - 1, bounds.Height - 1);

                // Pixels to eat away with the parent background
                // Grip side
                Rectangle topLeftParentHorizontalPixels = new Rectangle(topLeft, onePix);
                Rectangle bottomLeftParentHorizontalPixels = new Rectangle(bottomLeft, new Size(2, 1));
                Rectangle bottomLeftParentVerticalPixels = new Rectangle(bottomLeft.X, bottomLeft.Y - 1, 1, 2);

                // OverflowSide
                Rectangle bottomRightHorizontalPixels = new Rectangle(bottomRight.X - 1, bottomRight.Y, 2, 1);
                Rectangle bottomRightVerticalPixels = new Rectangle(bottomRight.X, bottomRight.Y - 1, 1, 2);

                // TopSide
                Rectangle topRightHorizontalPixels, topRightVerticalPixels;

                if (toolStrip.OverflowButton.Visible)
                {
                    topRightHorizontalPixels = new Rectangle(topRight.X - 1, topRight.Y, 1, 1);
                    topRightVerticalPixels = new Rectangle(topRight.X, topRight.Y, 1, 2);
                }
                else
                {
                    topRightHorizontalPixels = new Rectangle(topRight.X - 2, topRight.Y, 2, 1);
                    topRightVerticalPixels = new Rectangle(topRight.X, topRight.Y, 1, 3);
                }

                Region parentRegionToPaint = new Region(topLeftParentHorizontalPixels);
                parentRegionToPaint.Union(topLeftParentHorizontalPixels);
                parentRegionToPaint.Union(bottomLeftParentHorizontalPixels);
                parentRegionToPaint.Union(bottomLeftParentVerticalPixels);
                parentRegionToPaint.Union(bottomRightHorizontalPixels);
                parentRegionToPaint.Union(bottomRightVerticalPixels);
                parentRegionToPaint.Union(topRightHorizontalPixels);
                parentRegionToPaint.Union(topRightVerticalPixels);

                return parentRegionToPaint;
            }
            return null;
        }

        /// <summary>
        /// We want to make sure the overflow button looks like it's the last thing on the toolbar.
        /// This touches up the few pixels that get clobbered by painting the border.
        /// </summary>
        private void RenderOverflowButtonEffectsOverBorder(ToolStripRenderEventArgs e)
        {
            ToolStrip toolStrip = e.ToolStrip;
            ToolStripItem item = toolStrip.OverflowButton;
            if (!item.Visible)
            {
                return;
            }

            Graphics g = e.Graphics;

            Color overflowBottomLeftShadow, overflowTopShadow;

            if (item.Pressed)
            {
                overflowBottomLeftShadow = ColorTable.ButtonPressedGradientBegin;
                overflowTopShadow = overflowBottomLeftShadow;
            }
            else if (item.Selected)
            {
                overflowBottomLeftShadow = ColorTable.ButtonSelectedGradientMiddle;
                overflowTopShadow = overflowBottomLeftShadow;
            }
            else
            {
                overflowBottomLeftShadow = ColorTable.ToolStripBorder;
                overflowTopShadow = ColorTable.ToolStripGradientMiddle;
            }

            // Extend the gradient color over the border.
            using (var brush = overflowBottomLeftShadow.GetCachedSolidBrushScope())
            {
                g.FillRectangle(brush, toolStrip.Width - 1, toolStrip.Height - 2, 1, 1);
                g.FillRectangle(brush, toolStrip.Width - 2, toolStrip.Height - 1, 1, 1);
            }

            using (var brush = overflowTopShadow.GetCachedSolidBrushScope())
            {
                g.FillRectangle(brush, toolStrip.Width - 2, 0, 1, 1);
                g.FillRectangle(brush, toolStrip.Width - 1, 1, 1, 1);
            }
        }

        /// <summary>
        ///  This function paints with three colors, beginning, middle, and end.
        ///  it paints:
        ///  (1)the entire bounds in the middle color
        ///  (2)gradient from beginning to middle of width firstGradientWidth
        ///  (3)gradient from middle to end of width secondGradientWidth
        ///
        ///  if there isnt enough room to do (2) and (3) it merges into a single gradient from beginning to end.
        /// </summary>
        private void FillWithDoubleGradient(Color beginColor, Color middleColor, Color endColor, Graphics g, Rectangle bounds, int firstGradientWidth, int secondGradientWidth, LinearGradientMode mode, bool flipHorizontal)
        {
            if ((bounds.Width == 0) || (bounds.Height == 0))
            {
                return;  // can't new up a linear gradient brush with no dimension.
            }

            Rectangle endGradient = bounds;
            Rectangle beginGradient = bounds;
            bool useDoubleGradient;

            if (mode == LinearGradientMode.Horizontal)
            {
                if (flipHorizontal)
                {
                    Color temp = endColor;
                    endColor = beginColor;
                    beginColor = temp;
                }

                beginGradient.Width = firstGradientWidth;
                endGradient.Width = secondGradientWidth + 1;
                endGradient.X = bounds.Right - endGradient.Width;
                useDoubleGradient = (bounds.Width > (firstGradientWidth + secondGradientWidth));
            }
            else
            {
                beginGradient.Height = firstGradientWidth;
                endGradient.Height = secondGradientWidth + 1;
                endGradient.Y = bounds.Bottom - endGradient.Height;
                useDoubleGradient = (bounds.Height > (firstGradientWidth + secondGradientWidth));
            }

            if (useDoubleGradient)
            {
                // Fill with middleColor
                using (var brush = middleColor.GetCachedSolidBrushScope())
                {
                    g.FillRectangle(brush, bounds);
                }

                // draw first gradient
                using (Brush b = new LinearGradientBrush(beginGradient, beginColor, middleColor, mode))
                {
                    g.FillRectangle(b, beginGradient);
                }

                // draw second gradient
                using (LinearGradientBrush b = new LinearGradientBrush(endGradient, middleColor, endColor, mode))
                {
                    if (mode == LinearGradientMode.Horizontal)
                    {
                        endGradient.X += 1;
                        endGradient.Width -= 1;
                    }
                    else
                    {
                        endGradient.Y += 1;
                        endGradient.Height -= 1;
                    }

                    g.FillRectangle(b, endGradient);
                }
            }
            else
            {
                // not big enough for a swath in the middle.  lets just do a single gradient.
                using Brush b = new LinearGradientBrush(bounds, beginColor, endColor, mode);
                g.FillRectangle(b, bounds);
            }
        }

        private void RenderStatusStripBorder(ToolStripRenderEventArgs e)
        {
            e.Graphics.DrawLine(SystemPens.ButtonHighlight, 0, 0, e.ToolStrip.Width, 0);
        }

        private void RenderStatusStripBackground(ToolStripRenderEventArgs e)
        {
            StatusStrip statusStrip = e.ToolStrip as StatusStrip;
            RenderBackgroundGradient(
                e.Graphics,
                statusStrip,
                ColorTable.StatusStripGradientBegin,
                ColorTable.StatusStripGradientEnd,
                statusStrip.Orientation);
        }

        private void RenderCheckBackground(ToolStripItemImageRenderEventArgs e)
        {
            Rectangle bounds = DpiHelper.IsScalingRequired
                ? new Rectangle(
                    e.ImageRectangle.Left - 2,
                    (e.Item.Height - e.ImageRectangle.Height) / 2 - 1,
                    e.ImageRectangle.Width + 4, e.ImageRectangle.Height + 2)
                : new Rectangle(e.ImageRectangle.Left - 2, 1, e.ImageRectangle.Width + 4, e.Item.Height - 2);

            Graphics g = e.Graphics;

            if (!UseSystemColors)
            {
                Color fill = (e.Item.Selected) ? ColorTable.CheckSelectedBackground : ColorTable.CheckBackground;
                fill = (e.Item.Pressed) ? ColorTable.CheckPressedBackground : fill;
                using var brush = fill.GetCachedSolidBrushScope();
                g.FillRectangle(brush, bounds);

                using var pen = ColorTable.ButtonSelectedBorder.GetCachedPenScope();
                g.DrawRectangle(pen, bounds.X, bounds.Y, bounds.Width - 1, bounds.Height - 1);
            }
            else
            {
                if (e.Item.Pressed)
                {
                    RenderPressedButtonFill(g, bounds);
                }
                else
                {
                    RenderSelectedButtonFill(g, bounds);
                }
                g.DrawRectangle(SystemPens.Highlight, bounds.X, bounds.Y, bounds.Width - 1, bounds.Height - 1);
            }
        }

        private void RenderPressedGradient(Graphics g, Rectangle bounds)
        {
            if ((bounds.Width == 0) || (bounds.Height == 0))
            {
                return;  // can't new up a linear gradient brush with no dimension.
            }

            // Paints a horizontal gradient similar to the image margin.
            using Brush b = new LinearGradientBrush(
                bounds,
                ColorTable.MenuItemPressedGradientBegin,
                ColorTable.MenuItemPressedGradientEnd,
                LinearGradientMode.Vertical);
            g.FillRectangle(b, bounds);

            // draw a box around the gradient
            using var pen = ColorTable.MenuBorder.GetCachedPenScope();
            g.DrawRectangle(pen, bounds.X, bounds.Y, bounds.Width - 1, bounds.Height - 1);
        }

        private void RenderMenuStripBackground(ToolStripRenderEventArgs e)
        {
            RenderBackgroundGradient(e.Graphics, e.ToolStrip, ColorTable.MenuStripGradientBegin, ColorTable.MenuStripGradientEnd, e.ToolStrip.Orientation);
        }

        private static void RenderLabelInternal(ToolStripItemRenderEventArgs e)
        {
            Graphics g = e.Graphics;
            ToolStripItem item = e.Item;
            Rectangle bounds = new Rectangle(Point.Empty, item.Size);

            Rectangle fillRect = (item.Selected) ? item.ContentRectangle : bounds;

            if (item.BackgroundImage != null)
            {
                ControlPaint.DrawBackgroundImage(g, item.BackgroundImage, item.BackColor, item.BackgroundImageLayout, bounds, fillRect);
            }
        }

        private void RenderBackgroundGradient(Graphics g, Control control, Color beginColor, Color endColor)
        {
            RenderBackgroundGradient(g, control, beginColor, endColor, Orientation.Horizontal);
        }

        // renders the overall gradient
        private void RenderBackgroundGradient(Graphics g, Control control, Color beginColor, Color endColor, Orientation orientation)
        {
            if (control.RightToLeft == RightToLeft.Yes)
            {
                Color temp = beginColor;
                beginColor = endColor;
                endColor = temp;
            }

            if (orientation != Orientation.Horizontal)
            {
                using var brush = beginColor.GetCachedSolidBrushScope();
                g.FillRectangle(brush, new Rectangle(Point.Empty, control.Size));
                return;
            }

            Control parent = control.ParentInternal;
            if (parent != null)
            {
                Rectangle gradientBounds = new Rectangle(Point.Empty, parent.Size);
                if (!LayoutUtils.IsZeroWidthOrHeight(gradientBounds))
                {
                    using LinearGradientBrush b = new LinearGradientBrush(
                        gradientBounds,
                        beginColor,
                        endColor,
                        LinearGradientMode.Horizontal);
                    b.TranslateTransform(parent.Width - control.Location.X, parent.Height - control.Location.Y);
                    g.FillRectangle(b, new Rectangle(Point.Empty, control.Size));
                }
            }
            else
            {
                Rectangle gradientBounds = new Rectangle(Point.Empty, control.Size);
                if (!LayoutUtils.IsZeroWidthOrHeight(gradientBounds))
                {
                    // Don't have a parent that we know about - paint the gradient as if there isn't another container.
                    using LinearGradientBrush b = new LinearGradientBrush(
                        gradientBounds,
                        beginColor,
                        endColor,
                        LinearGradientMode.Horizontal);
                    g.FillRectangle(b, gradientBounds);
                }
            }
        }

        private void RenderToolStripBackgroundInternal(ToolStripRenderEventArgs e)
        {
            ScaleObjectSizesIfNeeded(e.ToolStrip.DeviceDpi);

            ToolStrip toolStrip = e.ToolStrip;
            Rectangle bounds = new Rectangle(Point.Empty, e.ToolStrip.Size);

            // fill up the background
            LinearGradientMode mode = (toolStrip.Orientation == Orientation.Horizontal) ? LinearGradientMode.Vertical : LinearGradientMode.Horizontal;
            FillWithDoubleGradient(ColorTable.ToolStripGradientBegin, ColorTable.ToolStripGradientMiddle, ColorTable.ToolStripGradientEnd, e.Graphics, bounds, iconWellGradientWidth, iconWellGradientWidth, mode, /*flipHorizontal=*/false);
        }

        private void RenderToolStripDropDownBackground(ToolStripRenderEventArgs e)
        {
            Rectangle bounds = new Rectangle(Point.Empty, e.ToolStrip.Size);

            using var brush = ColorTable.ToolStripDropDownBackground.GetCachedSolidBrushScope();
            e.Graphics.FillRectangle(brush, bounds);
        }

        private void RenderToolStripDropDownBorder(ToolStripRenderEventArgs e)
        {
            Graphics g = e.Graphics;

            if (e.ToolStrip is ToolStripDropDown toolStripDropDown)
            {
                Rectangle bounds = new Rectangle(Point.Empty, toolStripDropDown.Size);

                using (var pen = ColorTable.MenuBorder.GetCachedPenScope())
                {
                    g.DrawRectangle(pen, bounds.X, bounds.Y, bounds.Width - 1, bounds.Height - 1);
                }

                if (!(toolStripDropDown is ToolStripOverflow))
                {
                    // make the neck connected.
                    using var brush = ColorTable.ToolStripDropDownBackground.GetCachedSolidBrushScope();
                    g.FillRectangle(brush, e.ConnectedArea);
                }
            }
        }

        private void RenderOverflowBackground(ToolStripItemRenderEventArgs e, bool rightToLeft)
        {
            ScaleObjectSizesIfNeeded(e.Item.DeviceDpi);

            Graphics g = e.Graphics;
            ToolStripOverflowButton item = e.Item as ToolStripOverflowButton;
            Rectangle overflowBoundsFill = new Rectangle(Point.Empty, e.Item.Size);
            Rectangle bounds = overflowBoundsFill;

            bool drawCurve = (RoundedEdges && (!(item.GetCurrentParent() is MenuStrip)));
            bool horizontal = (e.ToolStrip.Orientation == Orientation.Horizontal);
            // undone RTL

            if (horizontal)
            {
                overflowBoundsFill.X += overflowBoundsFill.Width - overflowButtonWidth + 1;
                overflowBoundsFill.Width = overflowButtonWidth;
                if (rightToLeft)
                {
                    overflowBoundsFill = LayoutUtils.RTLTranslate(overflowBoundsFill, bounds);
                }
            }
            else
            {
                overflowBoundsFill.Y = overflowBoundsFill.Height - overflowButtonWidth + 1;
                overflowBoundsFill.Height = overflowButtonWidth;
            }

            Color overflowButtonGradientBegin, overflowButtonGradientMiddle, overflowButtonGradientEnd, overflowBottomLeftShadow, overflowTopShadow;

            if (item.Pressed)
            {
                overflowButtonGradientBegin = ColorTable.ButtonPressedGradientBegin;
                overflowButtonGradientMiddle = ColorTable.ButtonPressedGradientMiddle;
                overflowButtonGradientEnd = ColorTable.ButtonPressedGradientEnd;
                overflowBottomLeftShadow = ColorTable.ButtonPressedGradientBegin;
                overflowTopShadow = overflowBottomLeftShadow;
            }
            else if (item.Selected)
            {
                overflowButtonGradientBegin = ColorTable.ButtonSelectedGradientBegin;
                overflowButtonGradientMiddle = ColorTable.ButtonSelectedGradientMiddle;
                overflowButtonGradientEnd = ColorTable.ButtonSelectedGradientEnd;
                overflowBottomLeftShadow = ColorTable.ButtonSelectedGradientMiddle;
                overflowTopShadow = overflowBottomLeftShadow;
            }
            else
            {
                overflowButtonGradientBegin = ColorTable.OverflowButtonGradientBegin;
                overflowButtonGradientMiddle = ColorTable.OverflowButtonGradientMiddle;
                overflowButtonGradientEnd = ColorTable.OverflowButtonGradientEnd;
                overflowBottomLeftShadow = ColorTable.ToolStripBorder;
                overflowTopShadow = (horizontal) ? ColorTable.ToolStripGradientMiddle : ColorTable.ToolStripGradientEnd;
            }

            if (drawCurve)
            {
                // draw shadow pixel on bottom left +1, +1
                using var pen = overflowBottomLeftShadow.GetCachedPenScope();
                Point start = new Point(overflowBoundsFill.Left - 1, overflowBoundsFill.Height - 2);
                Point end = new Point(overflowBoundsFill.Left, overflowBoundsFill.Height - 2);
                if (rightToLeft)
                {
                    start.X = overflowBoundsFill.Right + 1;
                    end.X = overflowBoundsFill.Right;
                }
                g.DrawLine(pen, start, end);
            }

            LinearGradientMode mode = (horizontal) ? LinearGradientMode.Vertical : LinearGradientMode.Horizontal;

            // fill main body
            FillWithDoubleGradient(overflowButtonGradientBegin, overflowButtonGradientMiddle, overflowButtonGradientEnd, g, overflowBoundsFill, iconWellGradientWidth, iconWellGradientWidth, mode, false);

            if (!drawCurve)
            {
                return;
            }

            // Render shadow pixels (ToolStrip only)

            // top left and top right shadow pixels
            using (var brush = overflowTopShadow.GetCachedSolidBrushScope())
            {
                if (horizontal)
                {
                    Point top1 = new Point(overflowBoundsFill.X - 2, 0);
                    Point top2 = new Point(overflowBoundsFill.X - 1, 1);

                    if (rightToLeft)
                    {
                        top1.X = overflowBoundsFill.Right + 1;
                        top2.X = overflowBoundsFill.Right;
                    }
                    g.FillRectangle(brush, top1.X, top1.Y, 1, 1);
                    g.FillRectangle(brush, top2.X, top2.Y, 1, 1);
                }
                else
                {
                    g.FillRectangle(brush, overflowBoundsFill.Width - 3, overflowBoundsFill.Top - 1, 1, 1);
                    g.FillRectangle(brush, overflowBoundsFill.Width - 2, overflowBoundsFill.Top - 2, 1, 1);
                }
            }

            using (var brush = overflowButtonGradientBegin.GetCachedSolidBrushScope())
            {
                if (horizontal)
                {
                    Rectangle fillRect = new Rectangle(overflowBoundsFill.X - 1, 0, 1, 1);
                    if (rightToLeft)
                    {
                        fillRect.X = overflowBoundsFill.Right;
                    }
                    g.FillRectangle(brush, fillRect);
                }
                else
                {
                    g.FillRectangle(brush, overflowBoundsFill.X, overflowBoundsFill.Top - 1, 1, 1);
                }
            }
        }

        private void RenderToolStripCurve(ToolStripRenderEventArgs e)
        {
            Rectangle bounds = new Rectangle(Point.Empty, e.ToolStrip.Size);
            ToolStrip toolStrip = e.ToolStrip;
            Rectangle displayRect = toolStrip.DisplayRectangle;

            Graphics g = e.Graphics;

            Point topLeft = Point.Empty;
            Point topRight = new Point(bounds.Width - 1, 0);
            Point bottomLeft = new Point(0, bounds.Height - 1);

            // Add in shadow pixels - the detail that makes them look round

            // Draw in rounded shadow pixels on the top left & right (consider: if this is slow use precanned corners)
            using (var brush = ColorTable.ToolStripGradientMiddle.GetCachedSolidBrushScope())
            {
                // there are two shadow rects (one pixel wide) on the top
                Rectangle topLeftShadowRect = new Rectangle(topLeft, onePix);
                topLeftShadowRect.X += 1;

                // second shadow rect
                Rectangle topLeftShadowRect2 = new Rectangle(topLeft, onePix);
                topLeftShadowRect2.Y += 1;

                // on the right there are two more shadow rects
                Rectangle topRightShadowRect = new Rectangle(topRight, onePix);
                topRightShadowRect.X -= 2; // was 2?

                // second top right shadow pix
                Rectangle topRightShadowRect2 = topRightShadowRect;
                topRightShadowRect2.Y += 1;
                topRightShadowRect2.X += 1;

                Rectangle[] paintRects = new Rectangle[] { topLeftShadowRect, topLeftShadowRect2, topRightShadowRect, topRightShadowRect2 };

                // prevent the painting of anything that would obscure an item.
                for (int i = 0; i < paintRects.Length; i++)
                {
                    if (displayRect.IntersectsWith(paintRects[i]))
                    {
                        paintRects[i] = Rectangle.Empty;
                    }
                }

                g.FillRectangles(brush, paintRects);
            }

            // Draw in rounded shadow pixels on the bottom left
            using (var brush = ColorTable.ToolStripGradientEnd.GetCachedSolidBrushScope())
            {
                // this gradient is the one just before the dark shadow line starts on pixel #3.
                Point gradientCopyPixel = bottomLeft;
                gradientCopyPixel.Offset(1, -1);
                if (!displayRect.Contains(gradientCopyPixel))
                {
                    g.FillRectangle(brush, new Rectangle(gradientCopyPixel, onePix));
                }

                // set the one dark pixel in the bottom left hand corner
                Rectangle otherBottom = new Rectangle(bottomLeft.X, bottomLeft.Y - 2, 1, 1);
                if (!displayRect.IntersectsWith(otherBottom))
                {
                    g.FillRectangle(brush, otherBottom);
                }
            }
        }

        private void RenderSelectedButtonFill(Graphics g, Rectangle bounds)
        {
            if ((bounds.Width == 0) || (bounds.Height == 0))
            {
                return;  // can't new up a linear gradient brush with no dimension.
            }

            if (!UseSystemColors)
            {
                using Brush b = new LinearGradientBrush(
                    bounds,
                    ColorTable.ButtonSelectedGradientBegin,
                    ColorTable.ButtonSelectedGradientEnd,
                    LinearGradientMode.Vertical);

                g.FillRectangle(b, bounds);
            }
            else
            {
                using var brush = ColorTable.ButtonSelectedHighlight.GetCachedSolidBrushScope();
                g.FillRectangle(brush, bounds);
            }
        }
        private void RenderCheckedButtonFill(Graphics g, Rectangle bounds)
        {
            if ((bounds.Width == 0) || (bounds.Height == 0))
            {
                return;  // can't new up a linear gradient brush with no dimension.
            }

            if (!UseSystemColors)
            {
                using Brush b = new LinearGradientBrush(
                    bounds,
                    ColorTable.ButtonCheckedGradientBegin,
                    ColorTable.ButtonCheckedGradientEnd,
                    LinearGradientMode.Vertical);

                g.FillRectangle(b, bounds);
            }
            else
            {
                using var brush = ColorTable.ButtonCheckedHighlight.GetCachedSolidBrushScope();
                g.FillRectangle(brush, bounds);
            }
        }

        private void RenderSeparatorInternal(Graphics g, ToolStripItem item, Rectangle bounds, bool vertical)
        {
            bool isSeparator = item is ToolStripSeparator;
            bool isHorizontalSeparatorNotOnDropDownMenu = false;

            if (isSeparator)
            {
                if (vertical)
                {
                    if (!item.IsOnDropDown)
                    {
                        // center so that it matches office
                        bounds.Y += 3;
                        bounds.Height = Math.Max(0, bounds.Height - 6);
                    }
                }
                else
                {
                    // offset after the image margin
                    if (item.GetCurrentParent() is ToolStripDropDownMenu dropDownMenu)
                    {
                        if (dropDownMenu.RightToLeft == RightToLeft.No)
                        {
                            // scoot over by the padding (that will line you up with the text - but go two PX before so that it visually looks
                            // like the line meets up with the text).
                            bounds.X += dropDownMenu.Padding.Left - 2;
                            bounds.Width = dropDownMenu.Width - bounds.X;
                        }
                        else
                        {
                            // scoot over by the padding (that will line you up with the text - but go two PX before so that it visually looks
                            // like the line meets up with the text).
                            bounds.X += 2;
                            bounds.Width = dropDownMenu.Width - bounds.X - dropDownMenu.Padding.Right;
                        }
                    }
                    else
                    {
                        isHorizontalSeparatorNotOnDropDownMenu = true;
                    }
                }
            }

            using var foreColorPen = ColorTable.SeparatorDark.GetCachedPenScope();
            using var highlightColorPen = ColorTable.SeparatorLight.GetCachedPenScope();

            if (vertical)
            {
                if (bounds.Height >= 4)
                {
                    bounds.Inflate(0, -2);     // scoot down 2PX and start drawing
                }

                bool rightToLeft = (item.RightToLeft == RightToLeft.Yes);
                Pen leftPen = (rightToLeft) ? highlightColorPen : foreColorPen;
                Pen rightPen = (rightToLeft) ? foreColorPen : highlightColorPen;

                // Draw dark line
                int startX = bounds.Width / 2;

                g.DrawLine(leftPen, startX, bounds.Top, startX, bounds.Bottom - 1);

                // Draw highlight one pixel to the right
                startX++;
                g.DrawLine(rightPen, startX, bounds.Top + 1, startX, bounds.Bottom);
            }
            else
            {
                // Horizontal separator- draw dark line

                if (isHorizontalSeparatorNotOnDropDownMenu && bounds.Width >= 4)
                {
                    bounds.Inflate(-2, 0);     // scoot down 2PX and start drawing
                }

                int startY = bounds.Height / 2;

                g.DrawLine(foreColorPen, bounds.Left, startY, bounds.Right - 1, startY);

                if (!isSeparator || isHorizontalSeparatorNotOnDropDownMenu)
                {
                    // Draw highlight one pixel to the right
                    startY++;
                    g.DrawLine(highlightColorPen, bounds.Left + 1, startY, bounds.Right - 1, startY);
                }
            }
        }

        private void RenderPressedButtonFill(Graphics g, Rectangle bounds)
        {
            if ((bounds.Width == 0) || (bounds.Height == 0))
            {
                return;  // can't new up a linear gradient brush with no dimension.
            }

            if (!UseSystemColors)
            {
                using Brush b = new LinearGradientBrush(
                    bounds,
                    ColorTable.ButtonPressedGradientBegin,
                    ColorTable.ButtonPressedGradientEnd,
                    LinearGradientMode.Vertical);
                g.FillRectangle(b, bounds);
            }
            else
            {
                using var brush = ColorTable.ButtonPressedHighlight.GetCachedSolidBrushScope();
                g.FillRectangle(brush, bounds);
            }
        }

        private void RenderItemInternal(ToolStripItemRenderEventArgs e, bool useHotBorder)
        {
            Graphics g = e.Graphics;
            ToolStripItem item = e.Item;
            Rectangle bounds = new Rectangle(Point.Empty, item.Size);
            bool drawHotBorder = false;

            Rectangle fillRect = (item.Selected) ? item.ContentRectangle : bounds;

            if (item.BackgroundImage != null)
            {
                ControlPaint.DrawBackgroundImage(g, item.BackgroundImage, item.BackColor, item.BackgroundImageLayout, bounds, fillRect);
            }

            if (item.Pressed)
            {
                RenderPressedButtonFill(g, bounds);
                drawHotBorder = useHotBorder;
            }
            else if (item.Selected)
            {
                RenderSelectedButtonFill(g, bounds);
                drawHotBorder = useHotBorder;
            }
            else if (item.Owner != null && item.BackColor != item.Owner.BackColor)
            {
                using var brush = item.BackColor.GetCachedSolidBrushScope();
                g.FillRectangle(brush, bounds);
            }

            if (drawHotBorder)
            {
                using var pen = ColorTable.ButtonSelectedBorder.GetCachedPenScope();
                g.DrawRectangle(pen, bounds.X, bounds.Y, bounds.Width - 1, bounds.Height - 1);
            }
        }

        private void ScaleObjectSizesIfNeeded(int currentDeviceDpi)
        {
            if (DpiHelper.IsPerMonitorV2Awareness)
            {
                if (previousDeviceDpi != currentDeviceDpi)
                {
                    ScaleArrowOffsetsIfNeeded(currentDeviceDpi);
                    overflowButtonWidth = DpiHelper.LogicalToDeviceUnits(OVERFLOW_BUTTON_WIDTH, currentDeviceDpi);
                    overflowArrowWidth = DpiHelper.LogicalToDeviceUnits(OVERFLOW_ARROW_WIDTH, currentDeviceDpi);
                    overflowArrowHeight = DpiHelper.LogicalToDeviceUnits(OVERFLOW_ARROW_HEIGHT, currentDeviceDpi);
                    overflowArrowOffsetY = DpiHelper.LogicalToDeviceUnits(OVERFLOW_ARROW_OFFSETY, currentDeviceDpi);

                    gripPadding = DpiHelper.LogicalToDeviceUnits(GRIP_PADDING, currentDeviceDpi);
                    iconWellGradientWidth = DpiHelper.LogicalToDeviceUnits(ICON_WELL_GRADIENT_WIDTH, currentDeviceDpi);
                    int scaledSize = DpiHelper.LogicalToDeviceUnits(DROP_DOWN_MENU_ITEM_PAINT_PADDING_SIZE, currentDeviceDpi);
                    scaledDropDownMenuItemPaintPadding = new Padding(scaledSize + 1, 0, scaledSize, 0);
                    previousDeviceDpi = currentDeviceDpi;
                    isScalingInitialized = true;
                    return;
                }
            }

            if (isScalingInitialized)
            {
                return;
            }

            if (DpiHelper.IsScalingRequired)
            {
                ScaleArrowOffsetsIfNeeded();
                overflowButtonWidth = DpiHelper.LogicalToDeviceUnitsX(OVERFLOW_BUTTON_WIDTH);
                overflowArrowWidth = DpiHelper.LogicalToDeviceUnitsX(OVERFLOW_ARROW_WIDTH);
                overflowArrowHeight = DpiHelper.LogicalToDeviceUnitsY(OVERFLOW_ARROW_HEIGHT);
                overflowArrowOffsetY = DpiHelper.LogicalToDeviceUnitsY(OVERFLOW_ARROW_OFFSETY);

                gripPadding = DpiHelper.LogicalToDeviceUnitsY(GRIP_PADDING);
                iconWellGradientWidth = DpiHelper.LogicalToDeviceUnitsX(ICON_WELL_GRADIENT_WIDTH);
                int scaledSize = DpiHelper.LogicalToDeviceUnitsX(DROP_DOWN_MENU_ITEM_PAINT_PADDING_SIZE);
                scaledDropDownMenuItemPaintPadding = new Padding(scaledSize + 1, 0, scaledSize, 0);
            }

            isScalingInitialized = true;
        }

        // This draws differently sized arrows than the base one...
        // used only for drawing the overflow button madness.
        private Point RenderArrowInternal(Graphics g, Rectangle dropDownRect, ArrowDirection direction, Brush brush)
        {
            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;

            switch (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 - Offset2Y - 1),
                        new Point(middle.X + Offset2X, middle.Y + Offset2Y + 1),
                        new Point(middle.X - 1, middle.Y)
                    };
                    break;

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

            return middle;
        }

        #endregion PrivatePaintHelpers
    }
}
