ButtonRenderer.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / ButtonRenderer.cs / 1305376 / ButtonRenderer.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 Button control. It works downlevel too (obviously
    ///       without visual styles applied.) 
    ///    
    /// 
    public sealed class ButtonRenderer {
 
        //Make this per-thread, so that different threads can safely use these methods.
        [ThreadStatic] 
        private static VisualStyleRenderer visualStyleRenderer = null; 
        private static readonly VisualStyleElement ButtonElement = VisualStyleElement.Button.PushButton.Normal;
        private static bool renderMatchingApplicationState = true; 

        //cannot instantiate
        private ButtonRenderer() {
        } 

        ///  
        ///  
        ///    
        ///      If this property is true, then the renderer will use the setting from Application.RenderWithVisualStyles to 
        /// determine how to render.
        ///      If this property is false, the renderer will always render with visualstyles.
        ///    
        ///  
        public static bool RenderMatchingApplicationState {
            get { 
                return renderMatchingApplicationState; 
            }
            set { 
                renderMatchingApplicationState = value;
            }
        }
 
        private static bool RenderWithVisualStyles {
            get { 
                return (!renderMatchingApplicationState || Application.RenderWithVisualStyles); 
            }
        } 

        /// 
        /// 
        ///     
        ///       Returns true if the background corresponding to the given state is partially transparent, else false.
        ///     
        ///  
        public static bool IsBackgroundPartiallyTransparent(PushButtonState state) {
            if (RenderWithVisualStyles) { 
                InitializeRenderer((int)state);

                return visualStyleRenderer.IsBackgroundPartiallyTransparent();
            } 
            else {
                return false; //for downlevel, this is false 
            } 
        }
 
        /// 
        /// 
        ///    
        ///       This is just a convenience wrapper for VisualStyleRenderer.DrawThemeParentBackground. For downlevel, 
        ///       this isn't required and does nothing.
        ///     
        ///  
        [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
        public static void DrawParentBackground(Graphics g, Rectangle bounds, Control childControl) { 
            if (RenderWithVisualStyles) {
                InitializeRenderer(0);
                visualStyleRenderer.DrawParentBackground(g, bounds, childControl);
            } 
        }
 
        ///  
        /// 
        ///     
        ///       Renders a Button control.
        ///    
        /// 
        public static void DrawButton(Graphics g, Rectangle bounds, PushButtonState state) { 
                if (RenderWithVisualStyles) {
                    InitializeRenderer((int)state); 
 
                    visualStyleRenderer.DrawBackground(g, bounds);
                } 
                else {
                    ControlPaint.DrawButton(g, bounds, ConvertToButtonState(state));
                }
        } 

        ///  
        ///  
        ///    
        ///       Renders a Button control. 
        ///    
        /// 
        public static void DrawButton(Graphics g, Rectangle bounds, bool focused, PushButtonState state) {
                Rectangle contentBounds; 

                if (RenderWithVisualStyles) { 
                    InitializeRenderer((int)state); 

                    visualStyleRenderer.DrawBackground(g, bounds); 
                    contentBounds = visualStyleRenderer.GetBackgroundContentRectangle(g, bounds);
                }
                else {
                    ControlPaint.DrawButton(g, bounds, ConvertToButtonState(state)); 
                    contentBounds = Rectangle.Inflate(bounds, -3, -3);
                } 
 
                if (focused) {
                    ControlPaint.DrawFocusRectangle(g, contentBounds); 
                }
        }

        ///  
        /// 
        ///     
        ///       Renders a Button control. 
        ///    
        ///  
        public static void DrawButton(Graphics g, Rectangle bounds, string buttonText, Font font, bool focused, PushButtonState state) {
            DrawButton(g, bounds, buttonText, font,
                       TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter | TextFormatFlags.SingleLine,
                       focused, state); 
        }
 
 
        /// 
        ///  
        ///    
        ///       Renders a Button control.
        ///    
        ///  
        public static void DrawButton(Graphics g, Rectangle bounds, string buttonText, Font font, TextFormatFlags flags, bool focused, PushButtonState state) {
                Rectangle contentBounds; 
                Color textColor; 

                if (RenderWithVisualStyles) { 
                    InitializeRenderer((int)state);

                    visualStyleRenderer.DrawBackground(g, bounds);
                    contentBounds = visualStyleRenderer.GetBackgroundContentRectangle(g, bounds); 
                    textColor = visualStyleRenderer.GetColor(ColorProperty.TextColor);
                } 
                else { 
                    ControlPaint.DrawButton(g, bounds, ConvertToButtonState(state));
                    contentBounds = Rectangle.Inflate(bounds, -3, -3); 
                    textColor = SystemColors.ControlText;
                }

                TextRenderer.DrawText(g, buttonText, font, contentBounds, textColor, flags); 

                if (focused) { 
                    ControlPaint.DrawFocusRectangle(g, contentBounds); 
                }
        } 

        /// 
        /// 
        ///     
        ///       Renders a Button control.
        ///     
        ///  
        public static void DrawButton(Graphics g, Rectangle bounds, Image image, Rectangle imageBounds, bool focused, PushButtonState state) {
                Rectangle contentBounds; 

                if (RenderWithVisualStyles) {
                    InitializeRenderer((int)state);
 
                    visualStyleRenderer.DrawBackground(g, bounds);
                    visualStyleRenderer.DrawImage(g, imageBounds, image); 
                    contentBounds = visualStyleRenderer.GetBackgroundContentRectangle(g, bounds); 
                }
                else { 
                    ControlPaint.DrawButton(g, bounds, ConvertToButtonState(state));
                    g.DrawImage(image, imageBounds);
                    contentBounds = Rectangle.Inflate(bounds, -3, -3);
                } 

                if (focused) { 
                    ControlPaint.DrawFocusRectangle(g, contentBounds); 
                }
        } 

        /// 
        /// 
        ///     
        ///       Renders a Button control.
        ///     
        ///  
        public static void DrawButton(Graphics g, Rectangle bounds, string buttonText, Font font, Image image, Rectangle imageBounds, bool focused, PushButtonState state) {
            DrawButton(g, bounds, buttonText, font, 
                       TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter | TextFormatFlags.SingleLine,
                       image, imageBounds, focused, state);
        }
 
        /// 
        ///  
        ///     
        ///       Renders a Button control.
        ///     
        /// 
        public static void DrawButton(Graphics g, Rectangle bounds, string buttonText, Font font, TextFormatFlags flags, Image image, Rectangle imageBounds, bool focused, PushButtonState state) {
                Rectangle contentBounds;
                Color textColor; 

                if (RenderWithVisualStyles) { 
                    InitializeRenderer((int)state); 

                    visualStyleRenderer.DrawBackground(g, bounds); 
                    visualStyleRenderer.DrawImage(g, imageBounds, image);
                    contentBounds = visualStyleRenderer.GetBackgroundContentRectangle(g, bounds);
                    textColor = visualStyleRenderer.GetColor(ColorProperty.TextColor);
                } 
                else {
                    ControlPaint.DrawButton(g, bounds, ConvertToButtonState(state)); 
                    g.DrawImage(image, imageBounds); 
                    contentBounds = Rectangle.Inflate(bounds, -3, -3);
                    textColor = SystemColors.ControlText; 
                }

                TextRenderer.DrawText(g, buttonText, font, contentBounds, textColor, flags);
 
                if (focused) {
                    ControlPaint.DrawFocusRectangle(g, contentBounds); 
                } 
        }
 
        internal static ButtonState ConvertToButtonState(PushButtonState state) {
            switch (state) {

                case PushButtonState.Pressed: 
                    return ButtonState.Pushed;
                case PushButtonState.Disabled: 
                    return ButtonState.Inactive; 

                default: 
                    return ButtonState.Normal;
            }
        }
 
        private static void InitializeRenderer(int state) {
            if (visualStyleRenderer == null) { 
                visualStyleRenderer = new VisualStyleRenderer(ButtonElement.ClassName, ButtonElement.Part, state); 
            }
            else { 
                visualStyleRenderer.SetParameters(ButtonElement.ClassName, ButtonElement.Part, state);
            }
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ButtonRenderer.cs source code in C# .NET

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