ScrollBarRenderer.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / ScrollBarRenderer.cs / 1305376 / ScrollBarRenderer.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 
namespace System.Windows.Forms {
 
using System; 
using System.Drawing;
using System.Windows.Forms.VisualStyles; 
using System.Diagnostics.CodeAnalysis;
using Microsoft.Win32;

    ///  
    /// 
    ///     
    ///       This is a rendering class for the ScrollBar control. 
    ///    
    ///  
    public sealed class ScrollBarRenderer {

       //Make this per-thread, so that different threads can safely use these methods.
       [ThreadStatic] 
       private static VisualStyleRenderer visualStyleRenderer = null;
 
        //cannot instantiate 
       private ScrollBarRenderer() {
       } 

       /// 
       /// 
       ///     
       ///       Returns true if this class is supported for the current OS and user/application settings,
       ///       otherwise returns false. 
       ///     
       /// 
       public static bool IsSupported { 
           get {
               return VisualStyleRenderer.IsSupported; // no downlevel support
           }
       } 

       ///  
       ///  
       ///    
       ///       Renders a ScrollBar arrow button. 
       ///    
       /// 
       [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally
       public static void DrawArrowButton(Graphics g, Rectangle bounds, ScrollBarArrowButtonState state) { 
           InitializeRenderer(VisualStyleElement.ScrollBar.ArrowButton.LeftNormal, (int)state);
 
           visualStyleRenderer.DrawBackground(g, bounds); 
       }
 
       /// 
       /// 
       ///    
       ///       Renders a horizontal ScrollBar thumb. 
       ///    
       ///  
       [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally 
       public static void DrawHorizontalThumb(Graphics g, Rectangle bounds, ScrollBarState state) {
           InitializeRenderer(VisualStyleElement.ScrollBar.ThumbButtonHorizontal.Normal, (int)state); 

           visualStyleRenderer.DrawBackground(g, bounds);
       }
 
              /// 
       ///  
       ///     
       ///       Renders a vertical ScrollBar thumb.
       ///     
       /// 
       [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally
       public static void DrawVerticalThumb(Graphics g, Rectangle bounds, ScrollBarState state) {
           InitializeRenderer(VisualStyleElement.ScrollBar.ThumbButtonVertical.Normal, (int)state); 

           visualStyleRenderer.DrawBackground(g, bounds); 
       } 

       ///  
       /// 
       ///    
       ///       Renders a horizontal ScrollBar thumb grip.
       ///     
       /// 
       [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally 
       public static void DrawHorizontalThumbGrip(Graphics g, Rectangle bounds, ScrollBarState state) { 
           InitializeRenderer(VisualStyleElement.ScrollBar.GripperHorizontal.Normal, (int)state);
 
           visualStyleRenderer.DrawBackground(g, bounds);
       }

       ///  
       /// 
       ///     
       ///       Renders a vertical ScrollBar thumb grip. 
       ///    
       ///  
       [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally
       public static void DrawVerticalThumbGrip(Graphics g, Rectangle bounds, ScrollBarState state) {
           InitializeRenderer(VisualStyleElement.ScrollBar.GripperVertical.Normal, (int)state);
 
           visualStyleRenderer.DrawBackground(g, bounds);
       } 
 
       /// 
       ///  
       ///    
       ///       Renders a horizontal ScrollBar thumb.
       ///    
       ///  
       [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally
       public static void DrawRightHorizontalTrack(Graphics g, Rectangle bounds, ScrollBarState state) { 
           InitializeRenderer(VisualStyleElement.ScrollBar.RightTrackHorizontal.Normal, (int)state); 

           visualStyleRenderer.DrawBackground(g, bounds); 
       }

       /// 
       ///  
       ///    
       ///       Renders a horizontal ScrollBar thumb. 
       ///     
       /// 
       [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally 
       public static void DrawLeftHorizontalTrack(Graphics g, Rectangle bounds, ScrollBarState state) {
           InitializeRenderer(VisualStyleElement.ScrollBar.LeftTrackHorizontal.Normal, (int)state);

           visualStyleRenderer.DrawBackground(g, bounds); 
       }
 
       ///  
       /// 
       ///     
       ///       Renders a vertical ScrollBar thumb in the center of the given bounds.
       ///    
       /// 
       [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally 
       public static void DrawUpperVerticalTrack(Graphics g, Rectangle bounds, ScrollBarState state) {
           InitializeRenderer(VisualStyleElement.ScrollBar.UpperTrackVertical.Normal, (int)state); 
 
           visualStyleRenderer.DrawBackground(g, bounds);
       } 

       /// 
       /// 
       ///     
       ///       Renders a vertical ScrollBar thumb in the center of the given bounds.
       ///     
       ///  
       [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally
       public static void DrawLowerVerticalTrack(Graphics g, Rectangle bounds, ScrollBarState state) { 
           InitializeRenderer(VisualStyleElement.ScrollBar.LowerTrackVertical.Normal, (int)state);

           visualStyleRenderer.DrawBackground(g, bounds);
       } 

       ///  
       ///  
       ///    
       ///       Renders a ScrollBar size box in the center of the given bounds. 
       ///    
       /// 
       [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally
       public static void DrawSizeBox(Graphics g, Rectangle bounds, ScrollBarSizeBoxState state) { 
           InitializeRenderer(VisualStyleElement.ScrollBar.SizeBox.LeftAlign, (int)state);
 
           visualStyleRenderer.DrawBackground(g, bounds); 
       }
 
       /// 
       /// 
       ///    
       ///       Returns the size of the ScrollBar thumb grip. 
       ///    
       ///  
       [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally 
       public static Size GetThumbGripSize(Graphics g, ScrollBarState state) {
           InitializeRenderer(VisualStyleElement.ScrollBar.GripperHorizontal.Normal, (int)state); 

           return visualStyleRenderer.GetPartSize(g, ThemeSizeType.True);
       }
 
       /// 
       ///  
       ///     
       ///       Returns the size of the ScrollBar size box.
       ///     
       /// 
       [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally
       public static Size GetSizeBoxSize(Graphics g, ScrollBarState state) {
           InitializeRenderer(VisualStyleElement.ScrollBar.SizeBox.LeftAlign, (int)state); 

           return visualStyleRenderer.GetPartSize(g, ThemeSizeType.True); 
       } 

       private static void InitializeRenderer(VisualStyleElement element, int state) { 
           if (visualStyleRenderer == null) {
               visualStyleRenderer = new VisualStyleRenderer(element.ClassName, element.Part, state);
           }
           else { 
               visualStyleRenderer.SetParameters(element.ClassName, element.Part, state);
           } 
       } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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