DrawItemEvent.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / DrawItemEvent.cs / 1 / DrawItemEvent.cs
                        

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

namespace System.Windows.Forms { 
 
    using System.Diagnostics;
    using System; 
    using System.ComponentModel;
    using System.Drawing;
    using Microsoft.Win32;
 
    /// 
    ///  
    ///     This event is fired by owner draw Controls, such as ListBoxes and 
    ///     ComboBoxes. It contains all the information needed for the user to
    ///     paint the given item, including the item index, the Rectangle in which 
    ///     the drawing should be done, and the Graphics object with which the drawing
    ///     should be done.
    /// 
    public class DrawItemEventArgs : EventArgs { 

        ///  
        ///  
        ///     The backColor to paint each menu item with.
        ///  
        private Color backColor;

        /// 
        ///  
        ///     The foreColor to paint each menu item with.
        ///  
        private Color foreColor; 

        ///  
        /// 
        ///     The font used to draw the item's string.
        /// 
        private Font font; 

        ///  
        ///  
        ///     The graphics object with which the drawing should be done.
        ///  
        private readonly System.Drawing.Graphics graphics;

        /// 
        ///  
        ///     The index of the item that should be painted.
        ///  
        private readonly int index; 

        ///  
        /// 
        ///     The rectangle outlining the area in which the painting should be
        ///     done.
        ///  
        private readonly Rectangle rect;
 
        ///  
        /// 
        ///     Miscellaneous state information, such as whether the item is 
        ///     "selected", "focused", or some other such information.  ComboBoxes
        ///     have one special piece of information which indicates if the item
        ///     being painted is the editable portion of the ComboBox.
        ///  
        private readonly DrawItemState state;
 
        ///  
        /// 
        ///     Creates a new DrawItemEventArgs with the given parameters. 
        /// 
        public DrawItemEventArgs(Graphics graphics, Font font, Rectangle rect,
                             int index, DrawItemState state) {
            this.graphics = graphics; 
            this.font = font;
            this.rect = rect; 
            this.index = index; 
            this.state = state;
            this.foreColor = SystemColors.WindowText; 
            this.backColor = SystemColors.Window;
        }

        ///  
        /// 
        ///     Creates a new DrawItemEventArgs with the given parameters, including the foreColor and backColor of the control. 
        ///  
        public DrawItemEventArgs(Graphics graphics, Font font, Rectangle rect,
                             int index, DrawItemState state, Color foreColor, Color backColor) { 
            this.graphics = graphics;
            this.font = font;
            this.rect = rect;
            this.index = index; 
            this.state = state;
            this.foreColor = foreColor; 
            this.backColor = backColor; 
        }
 
        /// 
        public Color BackColor {
            get {
                if ((state & DrawItemState.Selected) == DrawItemState.Selected) { 
                    return SystemColors.Highlight;
                } 
                return backColor; 
            }
        } 



        ///  
        /// 
        ///     The rectangle outlining the area in which the painting should be 
        ///     done. 
        /// 
        public Rectangle Bounds { 
            get {
                return rect;
            }
        } 

        ///  
        ///  
        ///     A suggested font, usually the parent control's Font property.
        ///  
        public Font Font {
            get {
                return font;
            } 
        }
 
        ///  
        /// 
        ///     A suggested color drawing: either SystemColors.WindowText or SystemColors.HighlightText, 
        ///     depending on whether this item is selected.
        /// 
        public Color ForeColor {
            get { 
                if ((state & DrawItemState.Selected) == DrawItemState.Selected) {
                    return SystemColors.HighlightText; 
                } 
                return foreColor;
            } 
        }

        /// 
        ///  
        ///     Graphics object with which painting should be done.
        ///  
        public Graphics Graphics { 
            get {
                return graphics; 
            }
        }

        ///  
        /// 
        ///     The index of the item that should be painted. 
        ///  
        public int Index {
            get { 
                return index;
            }
        }
 
        /// 
        ///  
        ///     Miscellaneous state information, such as whether the item is 
        ///     "selected", "focused", or some other such information.  ComboBoxes
        ///     have one special piece of information which indicates if the item 
        ///     being painted is the editable portion of the ComboBox.
        /// 
        public DrawItemState State {
            get { 
                return state;
            } 
        } 

        ///  
        /// 
        ///     Draws the background of the given rectangle with the color returned from the BackColor property.
        /// 
        public virtual void DrawBackground() { 
            Brush backBrush = new SolidBrush(BackColor);
            Graphics.FillRectangle(backBrush, rect); 
            backBrush.Dispose(); 
        }
 
        /// 
        /// 
        ///     Draws a handy focus rect in the given rectangle.
        ///  
        public virtual void DrawFocusRectangle() {
            if ((state & DrawItemState.Focus) == DrawItemState.Focus 
                && (state & DrawItemState.NoFocusRect) != DrawItemState.NoFocusRect) 
                ControlPaint.DrawFocusRectangle(Graphics, rect, ForeColor, BackColor);
        } 
    }
}

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

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