TabRenderer.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / TabRenderer.cs / 1 / TabRenderer.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 
namespace System.Windows.Forms {
 
using System; 
using System.Drawing;
using System.Diagnostics.CodeAnalysis; 
using System.Windows.Forms.Internal;
using System.Windows.Forms.VisualStyles;
using Microsoft.Win32;
 
    /// 
    ///  
    ///     
    ///       This is a rendering class for the Tab control.
    ///     
    /// 
    public sealed class TabRenderer {

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

       /// 
       ///  
       ///    
       ///       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 Tab item.
       ///    
       /// 
       [ 
           SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters") // Using Graphics instead of IDeviceContext intentionally
       ] 
       public static void DrawTabItem(Graphics g, Rectangle bounds, TabItemState state) { 
           InitializeRenderer(VisualStyleElement.Tab.TabItem.Normal, (int)state);
 
           visualStyleRenderer.DrawBackground(g, bounds);
       }

       ///  
       /// 
       ///     
       ///       Renders a Tab item. 
       ///    
       ///  
       public static void DrawTabItem(Graphics g, Rectangle bounds, bool focused, TabItemState state) {
           InitializeRenderer(VisualStyleElement.Tab.TabItem.Normal, (int)state);

           visualStyleRenderer.DrawBackground(g, bounds); 

           // I need this hack since GetBackgroundContentRectangle() returns same rectangle 
           // as bounds for this control! 
           Rectangle contentBounds = Rectangle.Inflate(bounds, -3, -3);
           if (focused) { 
               ControlPaint.DrawFocusRectangle(g, contentBounds);
           }
       }
 
       /// 
       ///  
       ///     
       ///       Renders a Tab item.
       ///     
       /// 
       public static void DrawTabItem(Graphics g, Rectangle bounds, string tabItemText, Font font, TabItemState state) {
           DrawTabItem(g, bounds, tabItemText, font, false, state);
       } 

       ///  
       ///  
       ///    
       ///       Renders a Tab item. 
       ///    
       /// 
       public static void DrawTabItem(Graphics g, Rectangle bounds, string tabItemText, Font font, bool focused, TabItemState state) {
           DrawTabItem(g, bounds, tabItemText, font, 
                       TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter | TextFormatFlags.SingleLine,
                       focused, state); 
       } 

       ///  
       /// 
       ///    
       ///       Renders a Tab item.
       ///     
       /// 
       public static void DrawTabItem(Graphics g, Rectangle bounds, string tabItemText, Font font, TextFormatFlags flags, bool focused, TabItemState state) { 
           InitializeRenderer(VisualStyleElement.Tab.TabItem.Normal, (int)state); 
           visualStyleRenderer.DrawBackground(g, bounds);
 
           // I need this hack since GetBackgroundContentRectangle() returns same rectangle
           // as bounds for this control!
           Rectangle contentBounds = Rectangle.Inflate(bounds, -3, -3);
           Color textColor = visualStyleRenderer.GetColor(ColorProperty.TextColor); 
           TextRenderer.DrawText(g, tabItemText, font, contentBounds, textColor, flags);
 
           if (focused) { 
               ControlPaint.DrawFocusRectangle(g, contentBounds);
           } 
       }

       /// 
       ///  
       ///    
       ///       Renders a Tab item. 
       ///     
       /// 
       public static void DrawTabItem(Graphics g, Rectangle bounds, Image image, Rectangle imageRectangle, bool focused, TabItemState state) { 
           InitializeRenderer(VisualStyleElement.Tab.TabItem.Normal, (int)state);

           visualStyleRenderer.DrawBackground(g, bounds);
 
           // I need this hack since GetBackgroundContentRectangle() returns same rectangle
           // as bounds for this control! 
           Rectangle contentBounds = Rectangle.Inflate(bounds, -3, -3); 

           visualStyleRenderer.DrawImage(g, imageRectangle, image); 

           if (focused) {
               ControlPaint.DrawFocusRectangle(g, contentBounds);
           } 
       }
 
       ///  
       /// 
       ///     
       ///       Renders a Tab item.
       ///    
       /// 
       public static void DrawTabItem(Graphics g, Rectangle bounds, string tabItemText, Font font, Image image, Rectangle imageRectangle, bool focused, TabItemState state) { 
           DrawTabItem(g, bounds, tabItemText, font,
                       TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter | TextFormatFlags.SingleLine, 
                       image, imageRectangle, focused, state); 
       }
 
       /// 
       /// 
       ///    
       ///       Renders a Tab item. 
       ///    
       ///  
       public static void DrawTabItem(Graphics g, Rectangle bounds, string tabItemText, Font font, TextFormatFlags flags, Image image, Rectangle imageRectangle, bool focused, TabItemState state) { 
           InitializeRenderer(VisualStyleElement.Tab.TabItem.Normal, (int)state);
 
           visualStyleRenderer.DrawBackground(g, bounds);

           // I need this hack since GetBackgroundContentRectangle() returns same rectangle
           // as bounds for this control! 
           Rectangle contentBounds = Rectangle.Inflate(bounds, -3, -3);
           visualStyleRenderer.DrawImage(g, imageRectangle, image); 
           Color textColor = visualStyleRenderer.GetColor(ColorProperty.TextColor); 
           TextRenderer.DrawText(g, tabItemText, font, contentBounds, textColor, flags);
 
           if (focused) {
               ControlPaint.DrawFocusRectangle(g, contentBounds);
           }
       } 

       ///  
       ///  
       ///    
       ///       Renders a TabPage. 
       ///    
       /// 
       [
           SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters") // Using Graphics instead of IDeviceContext intentionally 
       ]
       public static void DrawTabPage(Graphics g, Rectangle bounds) { 
           InitializeRenderer(VisualStyleElement.Tab.Pane.Normal, 0); 

           visualStyleRenderer.DrawBackground(g, bounds); 
       }

       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.
// Copyright (c) Microsoft Corporation. All rights reserved.
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