TextBoxRenderer.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / TextBoxRenderer.cs / 1 / TextBoxRenderer.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 TextBox control. 
    ///    
    /// 
    public sealed class TextBoxRenderer {
 
        //Make this per-thread, so that different threads can safely use these methods.
        [ThreadStatic] 
        private static VisualStyleRenderer visualStyleRenderer = null; 
        private static readonly VisualStyleElement TextBoxElement = VisualStyleElement.TextBox.TextEdit.Normal;
 
        //cannot instantiate
        private TextBoxRenderer() {
        }
 
        /// 
        ///  
        ///     
        ///       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
            } 
        } 

        private static void DrawBackground(Graphics g, Rectangle bounds, TextBoxState state) { 
            visualStyleRenderer.DrawBackground(g, bounds);
            if (state != TextBoxState.Disabled) {
                Color windowColor = visualStyleRenderer.GetColor(ColorProperty.FillColor);
                if (windowColor != SystemColors.Window) { 
                    Rectangle fillRect = visualStyleRenderer.GetBackgroundContentRectangle(g, bounds);
                    //then we need to re-fill the background. 
                    g.FillRectangle(new SolidBrush(SystemColors.Window), fillRect); 
                }
            } 
        }

        /// 
        ///  
        ///    
        ///       Renders a TextBox control. 
        ///     
        /// 
        [ 
            SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters") // Using Graphics instead of IDeviceContext intentionally
        ]
        public static void DrawTextBox(Graphics g, Rectangle bounds, TextBoxState state) {
            InitializeRenderer((int)state); 
            DrawBackground(g, bounds, state);
        } 
 
        /// 
        ///  
        ///    
        ///       Renders a TextBox control.
        ///    
        ///  
        public static void DrawTextBox(Graphics g, Rectangle bounds, string textBoxText, Font font, TextBoxState state) {
            DrawTextBox(g, bounds, textBoxText, font, TextFormatFlags.TextBoxControl, state); 
        } 

        ///  
        /// 
        ///    
        ///       Renders a TextBox control.
        ///     
        /// 
        public static void DrawTextBox(Graphics g, Rectangle bounds, string textBoxText, Font font, Rectangle textBounds, TextBoxState state) { 
            DrawTextBox(g, bounds, textBoxText, font, textBounds, TextFormatFlags.TextBoxControl, state); 
        }
 
        /// 
        /// 
        ///    
        ///       Renders a TextBox control. 
        ///    
        ///  
        public static void DrawTextBox(Graphics g, Rectangle bounds, string textBoxText, Font font, TextFormatFlags flags, TextBoxState state) { 
            InitializeRenderer((int)state);
            Rectangle textBounds = visualStyleRenderer.GetBackgroundContentRectangle(g, bounds); 
            textBounds.Inflate(-2, -2);
            DrawTextBox(g, bounds, textBoxText, font, textBounds, flags, state);
        }
 
        /// 
        ///  
        ///     
        ///       Renders a TextBox control.
        ///     
        /// 
        [
            SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters") // Using Graphics instead of IDeviceContext intentionally
        ] 
        public static void DrawTextBox(Graphics g, Rectangle bounds, string textBoxText, Font font, Rectangle textBounds, TextFormatFlags flags, TextBoxState state) {
            InitializeRenderer((int)state); 
 
            DrawBackground(g, bounds, state);
            Color textColor = visualStyleRenderer.GetColor(ColorProperty.TextColor); 
            TextRenderer.DrawText(g, textBoxText, font, textBounds, textColor, flags);
        }

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

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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