Source/Ribbon/Office2007StartButton.cs

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using System;
using System.Text;
using System.ComponentModel;
using System.Drawing;
using DevComponents.DotNetBar.Rendering;
using System.Windows.Forms;

namespace DevComponents.DotNetBar
{
    /// <summary>
    /// Represents the Office 2007 start round button displayed in the top-left corner of the Ribbon Control.
    /// </summary>
    [System.ComponentModel.ToolboxItem(false), System.ComponentModel.DesignTimeVisible(false), DefaultEvent("Click"), Designer(typeof(Design.BaseItemDesigner))]
    public class Office2007StartButton : ButtonItem
    {
        #region Private Variables
        private bool m_ThumbTucked = false;
        #endregion

        #region Internal Implementation
        public override void RecalcSize()
        {
            ButtonItemLayout.LayoutButton(this, true);
            m_NeedRecalcSize = false;
        }

        protected internal override void OnExpandChange()
        {
            m_ThumbTucked = false;
            if (!this.DesignMode && this.Expanded && this.PopupLocation.IsEmpty && this.PopupSide == ePopupSide.Default && 
                (this.Parent is CaptionItemContainer ||
                this.Parent is RibbonTabItemContainer))
            {
                if (this.SubItems.Count > 0 && this.SubItems[0] is ItemContainer &&
                    ((ItemContainer)this.SubItems[0]).BackgroundStyle.Class == ElementStyleClassKeys.RibbonFileMenuContainerKey)
                {
                    RibbonStrip rs = this.ContainerControl as RibbonStrip;
                    if (rs != null)
                    {
                        if (this.Parent is RibbonTabItemContainer)
                        {
                            this.PopupLocation = new Point(this.IsRightToLeft ? this.Bounds.Right : this.LeftInternal, this.TopInternal);
                        }
                        else
                            this.PopupLocation = new Point(this.IsRightToLeft ? this.Bounds.Right : this.LeftInternal, rs.GetItemContainerBounds().Y - 1);
                        m_ThumbTucked = true;
                    }
                }
            }

            base.OnExpandChange();
        }

        internal override bool PopupPositionAdjusted
        {
            get { return base.PopupPositionAdjusted; }
            set
            {
                base.PopupPositionAdjusted = value;
                if (base.PopupPositionAdjusted && m_ThumbTucked)
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