Source/ScrollBar/ScrollBarCore.cs

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

namespace DevComponents.DotNetBar.ScrollBar
{
    public class ScrollBarCore : IDisposable
    {
        #region Private Variables
        private Rectangle m_DisplayRectangle = Rectangle.Empty;
        private eOrientation m_Orientation = eOrientation.Vertical;

        // Default thumb sizes...
        private Size m_VThumbSize = new Size(15, 17);
        private Size m_HThumbSize = new Size(17, 15);
        private Rectangle m_ThumbDecrease = Rectangle.Empty;
        private Rectangle m_ThumbIncrease = Rectangle.Empty;
        private Rectangle m_Track = Rectangle.Empty;
        private eScrollPart m_MouseOverPart = eScrollPart.None;

        private Control m_ParentControl = null;
        private bool m_MouseDown = false;
        private Timer m_ClickTimer = null;
        private int m_MouseDownTrackOffset = 0;
        private Bitmap m_CashedView = null;
        private bool m_ViewExpired = true;
        private bool m_PassiveScrollBar = false;
        private bool m_IsAppScrollBarStyle = false;
        public event EventHandler ValueChanged;
        private bool m_IsScrollBarParent = false;
        private bool m_IsAdvScrollBar = false;
        private int m_AutoClickCount = 0;
        public event ScrollEventHandler Scroll;
        #endregion

        #region Internal Implementation
        public ScrollBarCore() : this(null) { }

        public ScrollBarCore(Control parentControl) : this(parentControl, false) { }

        public ScrollBarCore(Control parentControl, bool isPassive)
        {
            m_ParentControl = parentControl;
            m_IsScrollBarParent = m_ParentControl is System.Windows.Forms.ScrollBar || m_ParentControl is ScrollBarAdv;
            m_IsAdvScrollBar = m_ParentControl is ScrollBarAdv;
            m_PassiveScrollBar = isPassive;
            DisposeCashedView();
        }

        internal void DisposeCashedView()
        {
            if (m_CashedView != null)
            {
                m_CashedView.Dispose();
                m_CashedView = null;
            }
        }

        public void Paint(ItemPaintArgs p)