UltimateZoneBuilder/Source/Core/Controls/SplitButton.cs

using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;

//Get the latest version of SplitButton at: http://wyday.com/splitbutton/

namespace CodeImp.DoomBuilder.Controls
{
    public class SplitButton : Button
    {
        private PushButtonState state;
        private const int splitsectionwidth = 18;
        private static readonly int borderSize = SystemInformation.Border3DSize.Width * 2;
		private bool skipNextOpen;
		private Rectangle dropDownRectangle;
		private bool showSplit;
		private bool isSplitMenuVisible;
	    private int currentmenustripitem; //mxd
		private ContextMenuStrip m_SplitMenuStrip;
		private TextFormatFlags textFormatFlags = TextFormatFlags.Default;

        #region Properties

        [Browsable(false)]
        public override ContextMenuStrip ContextMenuStrip
        {
            get
            {
                return SplitMenuStrip;
            }
            set
            {
                SplitMenuStrip = value;
            }
        }

        [DefaultValue(null)]
        public ContextMenuStrip SplitMenuStrip
        {
            get
            {
                return m_SplitMenuStrip;
            }
            set
            {
                //remove the event handlers for the old SplitMenuStrip
                if (m_SplitMenuStrip != null)
                {
                    m_SplitMenuStrip.Closing -= SplitMenuStrip_Closing;
                    m_SplitMenuStrip.Opening -= SplitMenuStrip_Opening;
	                m_SplitMenuStrip.ItemClicked -= SplitMenuStrip_OnItemClicked;
                }

                //add the event handlers for the new SplitMenuStrip
                if (value != null)
                {
	                ShowSplit = true;
	                value.Closing += SplitMenuStrip_Closing;
	                value.Opening += SplitMenuStrip_Opening;
	                value.ItemClicked += SplitMenuStrip_OnItemClicked; //mxd
	                CurrentMenuStripItem = currentmenustripitem;
                }
                else
                {
					ShowSplit = false;
	                currentmenustripitem = -1; //mxd
                }

                m_SplitMenuStrip = value;
            }
        }

	    //mxd
		public int CurrentMenuStripItem
	    {
		    get { return currentmenustripitem; }
			set 
			{
				if (value > -1 && m_SplitMenuStrip != null && m_SplitMenuStrip.Items.Count > value)
				{
					currentmenustripitem = value;
					this.Text = m_SplitMenuStrip.Items[value].Text;
					this.Image = m_SplitMenuStrip.Items[value].Image;
				}
				else
				{
					currentmenustripitem = -1;
				}
			}
	    }

	    [DefaultValue(false)]
        public bool ShowSplit
        {
            set
            {
                if (value != showSplit)
                {
                    showSplit = value;
                    Invalidate();

                    if (Parent != null)
                        Parent.PerformLayout();
                }
            }
        }

        private PushButtonState State
        {
            get
            {
                return state;
            }
            set
            {
                if (!state.Equals(value))
                {
                    state = value;
                    Invalidate();
                }
            }
        }

        #endregion Properties

        protected override bool IsInputKey(Keys keyData)
        {
            if (keyData.Equals(Keys.Down) && showSplit) return true;
            return base.IsInputKey(keyData);
        }

        protected override void OnGotFocus(EventArgs e)
        {
            if (!showSplit)
            {
                base.OnGotFocus(e);
                return;
            }

            if (!State.Equals(PushButtonState.Pressed) && !State.Equals(PushButtonState.Disabled))
            {
                State = PushButtonState.Default;
            }
        }

        protected override void OnKeyDown(KeyEventArgs kevent)
        {
            if (showSplit)
            {
                if (kevent.KeyCode.Equals(Keys.Down) && !isSplitMenuVisible)
                {
                    ShowContextMenuStrip();
                }

                else if (kevent.KeyCode.Equals(Keys.Space) && kevent.Modifiers == Keys.None)
                {
                    State = PushButtonState.Pressed;
                }
            }

            base.OnKeyDown(kevent);
        }

        protected override void OnKeyUp(KeyEventArgs kevent)
        {
            if (kevent.KeyCode.Equals(Keys.Space))
            {
                if (MouseButtons == MouseButtons.None)
                {
                    State = PushButtonState.Normal;
                }
            }
            else if (kevent.KeyCode.Equals(Keys.Apps))
            {
                if (MouseButtons == MouseButtons.None && !isSplitMenuVisible)
                {
                    ShowContextMenuStrip();
                }
            }

            base.OnKeyUp(kevent);
        }

        protected override void OnEnabledChanged(EventArgs e)
        {
            State = (Enabled ? PushButtonState.Normal : PushButtonState.Disabled);
            base.OnEnabledChanged(e);
        }

        protected override void OnLostFocus(EventArgs e)
        {
            if (!showSplit)
            {
                base.OnLostFocus(e);
                return;
            }

            if (!State.Equals(PushButtonState.Pressed) && !State.Equals(PushButtonState.Disabled))
            {
                State = PushButtonState.Normal;
            }
        }

        protected override void OnMouseEnter(EventArgs e)
        {
            if (!showSplit)
            {
                base.OnMouseEnter(e);
                return;
            }

            if (!State.Equals(PushButtonState.Pressed) && !State.Equals(PushButtonState.Disabled))
            {
                State = PushButtonState.Hot;
            }
               
        }

        protected override void OnMouseLeave(EventArgs e)
        {
            if (!showSplit)
            {
                base.OnMouseLeave(e);
                return;
            }

            if (!State.Equals(PushButtonState.Pressed) && !State.Equals(PushButtonState.Disabled))
            {
                State = Focused ? PushButtonState.Default : PushButtonState.Normal;
            }
        }

        protected override void OnMouseDown(MouseEventArgs e)
        {
            if (!showSplit)
            {
                base.OnMouseDown(e);
                return;
            }

            if (dropDownRectangle.Contains(e.Location) && !isSplitMenuVisible && e.Button == MouseButtons.Left)
            {
                ShowContextMenuStrip();
            }
            else
            {
                State = PushButtonState.Pressed;
            }
        }

        protected override void OnMouseUp(MouseEventArgs mevent)
        {
            if (!showSplit)
            {
                base.OnMouseUp(mevent);
                return;
            }

            // if the right button was released inside the button
            if (mevent.Button == MouseButtons.Right && ClientRectangle.Contains(mevent.Location) && !isSplitMenuVisible)
            {
                ShowContextMenuStrip();
            }
            else if (m_SplitMenuStrip == null || !isSplitMenuVisible)
            {
                SetButtonDrawState();

                if (ClientRectangle.Contains(mevent.Location) && !dropDownRectangle.Contains(mevent.Location))
                {
                    //OnClick(new EventArgs());
					if(currentmenustripitem != -1) m_SplitMenuStrip.Items[currentmenustripitem].PerformClick();
                }
            }
        }

        protected override void OnPaint(PaintEventArgs pevent)
        {
            base.OnPaint(pevent);

            if (!showSplit) return;

            Graphics g = pevent.Graphics;
            Rectangle bounds = ClientRectangle;

            // draw the button background as according to the current state.
            if (State != PushButtonState.Pressed && IsDefault && !Application.RenderWithVisualStyles)
            {
                Rectangle backgroundBounds = bounds;
                backgroundBounds.Inflate(-1, -1);
                ButtonRenderer.DrawButton(g, backgroundBounds, State);

                // button renderer doesnt draw the black frame when themes are off
                g.DrawRectangle(SystemPens.WindowFrame, 0, 0, bounds.Width - 1, bounds.Height - 1);
            }
            else
            {
                ButtonRenderer.DrawButton(g, bounds, State);
            }

            // calculate the current dropdown rectangle.
            dropDownRectangle = new Rectangle(bounds.Right - splitsectionwidth, 0, splitsectionwidth, bounds.Height);

            int internalBorder = borderSize;
            Rectangle focusRect =
                new Rectangle(internalBorder - 1,
                              internalBorder - 1,
                              bounds.Width - dropDownRectangle.Width - internalBorder,
                              bounds.Height - (internalBorder * 2) + 2);

            bool drawSplitLine = (State == PushButtonState.Hot || State == PushButtonState.Pressed || !Application.RenderWithVisualStyles);


            if (RightToLeft == RightToLeft.Yes)
            {
                dropDownRectangle.X = bounds.Left + 1;
                focusRect.X = dropDownRectangle.Right;

                if (drawSplitLine)
                {
                    // draw two lines at the edge of the dropdown button
                    g.DrawLine(SystemPens.ButtonShadow, bounds.Left + splitsectionwidth, borderSize, bounds.Left + splitsectionwidth, bounds.Bottom - borderSize);
                    g.DrawLine(SystemPens.ButtonFace, bounds.Left + splitsectionwidth + 1, borderSize, bounds.Left + splitsectionwidth + 1, bounds.Bottom - borderSize);
                }
            }
            else
            {
                if (drawSplitLine)
                {
                    // draw two lines at the edge of the dropdown button
                    g.DrawLine(SystemPens.ButtonShadow, bounds.Right - splitsectionwidth, borderSize, bounds.Right - splitsectionwidth, bounds.Bottom - borderSize);
                    g.DrawLine(SystemPens.ButtonFace, bounds.Right - splitsectionwidth - 1, borderSize, bounds.Right - splitsectionwidth - 1, bounds.Bottom - borderSize);
                }
            }

            // Draw an arrow in the correct location
            PaintArrow(g, dropDownRectangle);

            // paint the image and text
			PaintTextandImage(g, ClientRectangle /*new Rectangle(0, 0, ClientRectangle.Width, ClientRectangle.Height)*/);

            // draw the focus rectangle.
            if (State != PushButtonState.Pressed && Focused && ShowFocusCues)
            {
                ControlPaint.DrawFocusRectangle(g, focusRect);
            }
        }

        private void PaintTextandImage(Graphics g, Rectangle bounds)
        {
            // Figure out where our text and image should go
            Rectangle text_rectangle;
            Rectangle image_rectangle;

            CalculateButtonTextAndImageLayout(ref bounds, out text_rectangle, out image_rectangle);

            //draw the image
            if (Image != null)
            {
                if (Enabled)
                    g.DrawImage(Image, image_rectangle.X, image_rectangle.Y, Image.Width, Image.Height);
                else
                    ControlPaint.DrawImageDisabled(g, Image, image_rectangle.X, image_rectangle.Y, BackColor);
            }

            // If we dont' use mnemonic, set formatFlag to NoPrefix as this will show ampersand.
            if (!UseMnemonic)
                textFormatFlags = textFormatFlags | TextFormatFlags.NoPrefix;
            else if (!ShowKeyboardCues)
                textFormatFlags = textFormatFlags | TextFormatFlags.HidePrefix;

            //draw the text
            if (!string.IsNullOrEmpty(Text))
            {
                if (Enabled)
                    TextRenderer.DrawText(g, Text, Font, text_rectangle, ForeColor, textFormatFlags);
                else
                    ControlPaint.DrawStringDisabled(g, Text, Font, BackColor, text_rectangle, textFormatFlags);
            }
        }

        private void PaintArrow(Graphics g, Rectangle dropDownRect)
        {
            Point middle = new Point(Convert.ToInt32(dropDownRect.Left + dropDownRect.Width / 2), Convert.ToInt32(dropDownRect.Top + dropDownRect.Height / 2));

            //if the width is odd - favor pushing it over one pixel right.
            middle.X += (dropDownRect.Width % 2);

            Point[] arrow = new[] { new Point(middle.X - 2, middle.Y - 1), new Point(middle.X + 3, middle.Y - 1), new Point(middle.X, middle.Y + 2) };
	        g.FillPolygon(Enabled ? SystemBrushes.ControlText : SystemBrushes.ButtonShadow, arrow);
        }

        public override Size GetPreferredSize(Size proposedSize)
        {
            Size preferredSize = base.GetPreferredSize(proposedSize);

            //autosize correctly for splitbuttons
            if (showSplit)
            {
                if (AutoSize) return CalculateButtonAutoSize();
                
                if (!string.IsNullOrEmpty(Text) && TextRenderer.MeasureText(Text, Font).Width + splitsectionwidth > preferredSize.Width)
                    return preferredSize + new Size(splitsectionwidth + borderSize * 2, 0);
            }

            return preferredSize;
        }

        private Size CalculateButtonAutoSize()
        {
            Size ret_size = Size.Empty;
            Size text_size = TextRenderer.MeasureText(Text, Font);
            Size image_size = Image == null ? Size.Empty : Image.Size;

            // Pad the text size
            if (Text.Length != 0)
            {
                text_size.Height += 4;
                text_size.Width += 4;
            }

            switch (TextImageRelation)
            {
                case TextImageRelation.Overlay:
                    ret_size.Height = Math.Max(Text.Length == 0 ? 0 : text_size.Height, image_size.Height);
                    ret_size.Width = Math.Max(text_size.Width, image_size.Width);
                    break;
                case TextImageRelation.ImageAboveText:
                case TextImageRelation.TextAboveImage:
                    ret_size.Height = text_size.Height + image_size.Height;
                    ret_size.Width = Math.Max(text_size.Width, image_size.Width);
                    break;
                case TextImageRelation.ImageBeforeText:
                case TextImageRelation.TextBeforeImage:
                    ret_size.Height = Math.Max(text_size.Height, image_size.Height);
                    ret_size.Width = text_size.Width + image_size.Width;
                    break;
            }

            // Pad the result
            ret_size.Height += (Padding.Vertical + 6);
            ret_size.Width += (Padding.Horizontal + 6);

            //pad the splitButton arrow region
            if (showSplit) ret_size.Width += splitsectionwidth;

            return ret_size;
        }

        #region Button Layout Calculations

        //The following layout functions were taken from Mono's Windows.Forms 
        //implementation, specifically "ThemeWin32Classic.cs", 
        //then modified to fit the context of this splitButton

        private void CalculateButtonTextAndImageLayout(ref Rectangle content_rect, out Rectangle textRectangle, out Rectangle imageRectangle)
        {
            Size text_size = TextRenderer.MeasureText(Text, Font, content_rect.Size, textFormatFlags);
            Size image_size = Image == null ? Size.Empty : Image.Size;

            textRectangle = Rectangle.Empty;
            imageRectangle = Rectangle.Empty;

            switch (TextImageRelation)
            {
                case TextImageRelation.Overlay:
                    // Overlay is easy, text always goes here
                    textRectangle = OverlayObjectRect(ref content_rect, ref text_size, TextAlign); // Rectangle.Inflate(content_rect, -4, -4);

                    //Offset on Windows 98 style when button is pressed
                    if (state == PushButtonState.Pressed && !Application.RenderWithVisualStyles)
                        textRectangle.Offset(1, 1);

                    // Image is dependent on ImageAlign
                    if (Image != null)
                        imageRectangle = OverlayObjectRect(ref content_rect, ref image_size, ImageAlign);

                    break;
                case TextImageRelation.ImageAboveText:
                    content_rect.Inflate(-4, -4);
                    LayoutTextAboveOrBelowImage(content_rect, false, text_size, image_size, out textRectangle, out imageRectangle);
                    break;
                case TextImageRelation.TextAboveImage:
                    content_rect.Inflate(-4, -4);
                    LayoutTextAboveOrBelowImage(content_rect, true, text_size, image_size, out textRectangle, out imageRectangle);
                    break;
                case TextImageRelation.ImageBeforeText:
                    content_rect.Inflate(-4, -4);
                    LayoutTextBeforeOrAfterImage(content_rect, false, text_size, image_size, out textRectangle, out imageRectangle);
                    break;
                case TextImageRelation.TextBeforeImage:
                    content_rect.Inflate(-4, -4);
                    LayoutTextBeforeOrAfterImage(content_rect, true, text_size, image_size, out textRectangle, out imageRectangle);
                    break;
            }
        }

        private static Rectangle OverlayObjectRect(ref Rectangle container, ref Size sizeOfObject, System.Drawing.ContentAlignment alignment)
        {
            int x, y;

            switch (alignment)
            {
                case System.Drawing.ContentAlignment.TopLeft:
                    x = 4;
                    y = 4;
                    break;
                case System.Drawing.ContentAlignment.TopCenter:
                    x = (container.Width - sizeOfObject.Width) / 2;
                    y = 4;
                    break;
                case System.Drawing.ContentAlignment.TopRight:
                    x = container.Width - sizeOfObject.Width - 4;
                    y = 4;
                    break;
                case System.Drawing.ContentAlignment.MiddleLeft:
                    x = 4;
                    y = (container.Height - sizeOfObject.Height) / 2;
                    break;
                case System.Drawing.ContentAlignment.MiddleCenter:
                    x = (container.Width - sizeOfObject.Width) / 2;
                    y = (container.Height - sizeOfObject.Height) / 2;
                    break;
                case System.Drawing.ContentAlignment.MiddleRight:
                    x = container.Width - sizeOfObject.Width - 4;
                    y = (container.Height - sizeOfObject.Height) / 2;
                    break;
                case System.Drawing.ContentAlignment.BottomLeft:
                    x = 4;
                    y = container.Height - sizeOfObject.Height - 4;
                    break;
                case System.Drawing.ContentAlignment.BottomCenter:
                    x = (container.Width - sizeOfObject.Width) / 2;
                    y = container.Height - sizeOfObject.Height - 4;
                    break;
                case System.Drawing.ContentAlignment.BottomRight:
                    x = container.Width - sizeOfObject.Width - 4;
                    y = container.Height - sizeOfObject.Height - 4;
                    break;
                default:
                    x = 4;
                    y = 4;
                    break;
            }

            return new Rectangle(x, y, sizeOfObject.Width, sizeOfObject.Height);
        }

        private void LayoutTextBeforeOrAfterImage(Rectangle totalArea, bool textFirst, Size textSize, Size imageSize, out Rectangle textRect, out Rectangle imageRect)
        {
            int element_spacing = 0;	// Spacing between the Text and the Image
            int total_width = textSize.Width + element_spacing + imageSize.Width;

            if (!textFirst)
                element_spacing += 2;

            // If the text is too big, chop it down to the size we have available to it
            if (total_width > totalArea.Width)
            {
                textSize.Width = totalArea.Width - element_spacing - imageSize.Width;
                total_width = totalArea.Width;
            }

            int excess_width = totalArea.Width - total_width;
            int offset = 0;

            Rectangle final_text_rect;
            Rectangle final_image_rect;

            HorizontalAlignment h_text = GetHorizontalAlignment(TextAlign);
            HorizontalAlignment h_image = GetHorizontalAlignment(ImageAlign);

            if (h_image == HorizontalAlignment.Left)
                offset = 0;
            else if (h_image == HorizontalAlignment.Right && h_text == HorizontalAlignment.Right)
                offset = excess_width;
            else if (h_image == HorizontalAlignment.Center && (h_text == HorizontalAlignment.Left || h_text == HorizontalAlignment.Center))
                offset += excess_width / 3;
            else
                offset += 2 * (excess_width / 3);

            if (textFirst)
            {
                final_text_rect = new Rectangle(totalArea.Left + offset, AlignInRectangle(totalArea, textSize, TextAlign).Top, textSize.Width, textSize.Height);
                final_image_rect = new Rectangle(final_text_rect.Right + element_spacing, AlignInRectangle(totalArea, imageSize, ImageAlign).Top, imageSize.Width, imageSize.Height);
            }
            else
            {
                final_image_rect = new Rectangle(totalArea.Left + offset, AlignInRectangle(totalArea, imageSize, ImageAlign).Top, imageSize.Width, imageSize.Height);
                final_text_rect = new Rectangle(final_image_rect.Right + element_spacing, AlignInRectangle(totalArea, textSize, TextAlign).Top, textSize.Width, textSize.Height);
            }

            textRect = final_text_rect;
            imageRect = final_image_rect;
        }

        private void LayoutTextAboveOrBelowImage(Rectangle totalArea, bool textFirst, Size textSize, Size imageSize, out Rectangle textRect, out Rectangle imageRect)
        {
            int element_spacing = 0;	// Spacing between the Text and the Image
            int total_height = textSize.Height + element_spacing + imageSize.Height;

            if (textFirst)
                element_spacing += 2;

            if (textSize.Width > totalArea.Width)
                textSize.Width = totalArea.Width;

            // If the there isn't enough room and we're text first, cut out the image
            if (total_height > totalArea.Height && textFirst)
            {
                imageSize = Size.Empty;
                total_height = totalArea.Height;
            }

            int excess_height = totalArea.Height - total_height;
            int offset = 0;

            Rectangle final_text_rect;
            Rectangle final_image_rect;

            VerticalAlignment v_text = GetVerticalAlignment(TextAlign);
            VerticalAlignment v_image = GetVerticalAlignment(ImageAlign);

            if (v_image == VerticalAlignment.Top)
                offset = 0;
            else if (v_image == VerticalAlignment.Bottom && v_text == VerticalAlignment.Bottom)
                offset = excess_height;
            else if (v_image == VerticalAlignment.Center && (v_text == VerticalAlignment.Top || v_text == VerticalAlignment.Center))
                offset += excess_height / 3;
            else
                offset += 2 * (excess_height / 3);

            if (textFirst)
            {
                final_text_rect = new Rectangle(AlignInRectangle(totalArea, textSize, TextAlign).Left, totalArea.Top + offset, textSize.Width, textSize.Height);
                final_image_rect = new Rectangle(AlignInRectangle(totalArea, imageSize, ImageAlign).Left, final_text_rect.Bottom + element_spacing, imageSize.Width, imageSize.Height);
            }
            else
            {
                final_image_rect = new Rectangle(AlignInRectangle(totalArea, imageSize, ImageAlign).Left, totalArea.Top + offset, imageSize.Width, imageSize.Height);
                final_text_rect = new Rectangle(AlignInRectangle(totalArea, textSize, TextAlign).Left, final_image_rect.Bottom + element_spacing, textSize.Width, textSize.Height);

                if (final_text_rect.Bottom > totalArea.Bottom)
                    final_text_rect.Y = totalArea.Top;
            }

            textRect = final_text_rect;
            imageRect = final_image_rect;
        }

        private static HorizontalAlignment GetHorizontalAlignment(System.Drawing.ContentAlignment align)
        {
            switch (align)
            {
                case System.Drawing.ContentAlignment.BottomLeft:
                case System.Drawing.ContentAlignment.MiddleLeft:
                case System.Drawing.ContentAlignment.TopLeft:
                    return HorizontalAlignment.Left;
                case System.Drawing.ContentAlignment.BottomCenter:
                case System.Drawing.ContentAlignment.MiddleCenter:
                case System.Drawing.ContentAlignment.TopCenter:
                    return HorizontalAlignment.Center;
                case System.Drawing.ContentAlignment.BottomRight:
                case System.Drawing.ContentAlignment.MiddleRight:
                case System.Drawing.ContentAlignment.TopRight:
                    return HorizontalAlignment.Right;
            }

            return HorizontalAlignment.Left;
        }

        private static VerticalAlignment GetVerticalAlignment(System.Drawing.ContentAlignment align)
        {
            switch (align)
            {
                case System.Drawing.ContentAlignment.TopLeft:
                case System.Drawing.ContentAlignment.TopCenter:
                case System.Drawing.ContentAlignment.TopRight:
                    return VerticalAlignment.Top;
                case System.Drawing.ContentAlignment.MiddleLeft:
                case System.Drawing.ContentAlignment.MiddleCenter:
                case System.Drawing.ContentAlignment.MiddleRight:
                    return VerticalAlignment.Center;
                case System.Drawing.ContentAlignment.BottomLeft:
                case System.Drawing.ContentAlignment.BottomCenter:
                case System.Drawing.ContentAlignment.BottomRight:
                    return VerticalAlignment.Bottom;
            }

            return VerticalAlignment.Top;
        }

	    private static Rectangle AlignInRectangle(Rectangle outer, Size inner, System.Drawing.ContentAlignment align)
        {
            int x = 0;
            int y = 0;

            if (align == System.Drawing.ContentAlignment.BottomLeft || align == System.Drawing.ContentAlignment.MiddleLeft || align == System.Drawing.ContentAlignment.TopLeft)
                x = outer.X;
            else if (align == System.Drawing.ContentAlignment.BottomCenter || align == System.Drawing.ContentAlignment.MiddleCenter || align == System.Drawing.ContentAlignment.TopCenter)
                x = Math.Max(outer.X + ((outer.Width - inner.Width) / 2), outer.Left);
            else if (align == System.Drawing.ContentAlignment.BottomRight || align == System.Drawing.ContentAlignment.MiddleRight || align == System.Drawing.ContentAlignment.TopRight)
                x = outer.Right - inner.Width;
            if (align == System.Drawing.ContentAlignment.TopCenter || align == System.Drawing.ContentAlignment.TopLeft || align == System.Drawing.ContentAlignment.TopRight)
                y = outer.Y;
            else if (align == System.Drawing.ContentAlignment.MiddleCenter || align == System.Drawing.ContentAlignment.MiddleLeft || align == System.Drawing.ContentAlignment.MiddleRight)
                y = outer.Y + (outer.Height - inner.Height) / 2;
            else if (align == System.Drawing.ContentAlignment.BottomCenter || align == System.Drawing.ContentAlignment.BottomRight || align == System.Drawing.ContentAlignment.BottomLeft)
                y = outer.Bottom - inner.Height;

            return new Rectangle(x, y, Math.Min(inner.Width, outer.Width), Math.Min(inner.Height, outer.Height));
        }

        #endregion Button Layout Calculations

        private void ShowContextMenuStrip()
        {
            if (skipNextOpen)
            {
                // we were called because we're closing the context menu strip
                // when clicking the dropdown button.
                skipNextOpen = false;
                return;
            }

            State = PushButtonState.Pressed;

			if (m_SplitMenuStrip != null)
            {
                m_SplitMenuStrip.Show(this, new Point(0, Height), ToolStripDropDownDirection.BelowRight);
            }
        }

		private void SplitMenuStrip_Opening(object sender, CancelEventArgs e)
        {
            isSplitMenuVisible = true;
        }

		private void SplitMenuStrip_Closing(object sender, ToolStripDropDownClosingEventArgs e)
        {
            isSplitMenuVisible = false;

            SetButtonDrawState();

            if (e.CloseReason == ToolStripDropDownCloseReason.AppClicked)
            {
                skipNextOpen = (dropDownRectangle.Contains(PointToClient(Cursor.Position))) && MouseButtons == MouseButtons.Left;
            }
        }

		//mxd
		private void SplitMenuStrip_OnItemClicked(object sender, ToolStripItemClickedEventArgs e)
		{
			this.Text = e.ClickedItem.Text;
			this.Image = e.ClickedItem.Image;
			currentmenustripitem = m_SplitMenuStrip.Items.IndexOf(e.ClickedItem);
		}

        protected override void WndProc(ref Message m)
        {
            //0x0212 == WM_EXITMENULOOP
            if (m.Msg == 0x0212)
            {
                //this message is only sent when a ContextMenu is closed (not a ContextMenuStrip)
                isSplitMenuVisible = false;
                SetButtonDrawState();
            }

            base.WndProc(ref m);
        }

        private void SetButtonDrawState()
        {
            if (Bounds.Contains(Parent.PointToClient(Cursor.Position)))
            {
                State = PushButtonState.Hot;
            }
            else if (Focused)
            {
                State = PushButtonState.Default;
            }
            else if (!Enabled)
            {
                State = PushButtonState.Disabled;
            }
            else
            {
                State = PushButtonState.Normal;
            }
        }
    }
}