Source/Ribbon/KeyTipsCanvasControl.cs

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using System;
using System.Text;
using System.Windows.Forms;
using System.Drawing;

namespace DevComponents.DotNetBar
{
    /// <summary>
    /// Represents canvas for KeyTips
    /// </summary>
    internal class KeyTipsCanvasControl : Control
    {
        #region Private variables
        private Control m_ParentControl=null;
        private IKeyTipsRenderer m_Renderer=null;
        #endregion

        #region Internal Implementation
        public KeyTipsCanvasControl(IKeyTipsRenderer renderer)
        {
            this.SetStyle(ControlStyles.UserPaint, true);
            this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
            this.SetStyle(ControlStyles.Opaque, true);
            this.SetStyle(ControlStyles.ResizeRedraw, true);
            this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
            this.SetStyle(ControlStyles.ContainerControl, false);
            this.SetStyle(ControlStyles.Selectable, false);
            this.BackColor = Color.Transparent;
            m_Renderer = renderer;
        }

        protected override void Dispose(bool disposing)
        {
            if (m_ParentControl != null)
            {
                m_ParentControl.Resize -= new EventHandler(ParentControlResize);
                m_ParentControl = null;
            }

            base.Dispose(disposing);
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            if (m_Renderer != null)
            {
                m_Renderer.PaintKeyTips(e.Graphics);
            }
            base.OnPaint(e);
        }

        protected override void OnParentChanged(EventArgs e)
        {
            if (m_ParentControl != null)
                m_ParentControl.Resize -= new EventHandler(ParentControlResize);
            
            m_ParentControl = this.Parent;
            
            if(m_ParentControl!=null)
                m_ParentControl.Resize += new EventHandler(ParentControlResize);