CursorEditor.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / Drawing / System / Drawing / Design / CursorEditor.cs / 1 / CursorEditor.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Drawing.Design { 
 
    using Microsoft.Win32;
    using System; 
    using System.ComponentModel;
    using System.Diagnostics;
    using System.Drawing;
    using System.IO; 
    using System.Collections;
    using System.Reflection; 
    using System.Runtime.Serialization.Formatters; 
    using System.Windows.Forms;
    using System.Windows.Forms.ComponentModel; 
    using System.Windows.Forms.Design;

    /// 
    ///  
    /// 
    ///     Provides an editor that can perform default file searching for cursor (.cur) 
    ///     files. 
    /// 
    [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)] 
    [System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.InheritanceDemand, Name="FullTrust")]
    [System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.LinkDemand, Name="FullTrust")]
    public class CursorEditor : UITypeEditor {
 
        private CursorUI cursorUI;
 
        ///  
        /// 
        ///     Returns true, indicating that this drop-down control can be resized. 
        /// 
        public override bool IsDropDownResizable {
            get {
                return true; 
            }
        } 
 
        /// 
        ///  
        ///     Edits the given object value using the editor style provided by
        ///     GetEditorStyle.  A service provider is provided so that any
        ///     required editing services can be obtained.
        ///  
        public override object EditValue(ITypeDescriptorContext context,  IServiceProvider  provider, object value) {
 
            object returnValue = value; 

            if (provider != null) { 
                IWindowsFormsEditorService edSvc = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));

                if (edSvc != null) {
                    if (cursorUI == null) { 
                        cursorUI = new CursorUI(this);
                    } 
                    cursorUI.Start(edSvc, value); 
                    edSvc.DropDownControl(cursorUI);
                    value = cursorUI.Value; 
                    cursorUI.End();
                }
            }
 
            return value;
        } 
 
        /// 
        ///  
        ///     Retrieves the editing style of the Edit method.  If the method
        ///     is not supported, this will return None.
        /// 
        public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context) { 
            return UITypeEditorEditStyle.DropDown;
        } 
 
        /// 
        ///  
        ///     The user interface for the cursor drop-down.  This is just an owner-drawn
        ///     list box.
        /// 
        private class CursorUI : ListBox { 
            private object value;
            private IWindowsFormsEditorService edSvc; 
            private TypeConverter cursorConverter; 
            private UITypeEditor editor;
 
            public CursorUI(UITypeEditor editor) {
                this.editor = editor;

                Height = 310; 
                ItemHeight = (int) Math.Max(4 + Cursors.Default.Size.Height, Font.Height);
                DrawMode = DrawMode.OwnerDrawFixed; 
                BorderStyle = BorderStyle.None; 

                cursorConverter = TypeDescriptor.GetConverter(typeof(Cursor)); 
                Debug.Assert(cursorConverter.GetStandardValuesSupported(), "Converter '" + cursorConverter.ToString() + "' does not support a list of standard values.  We cannot provide a drop-down");

                // Fill the list with cursors.
                // 
                if (cursorConverter.GetStandardValuesSupported()) {
                    foreach (object obj in cursorConverter.GetStandardValues()) { 
                        Items.Add(obj); 
                    }
                } 
            }

            public object Value {
                get { 
                    return value;
                } 
            } 

            public void End() { 
                edSvc = null;
                value = null;
            }
 
            protected override void OnClick(EventArgs e) {
                base.OnClick(e); 
                value = SelectedItem; 
                edSvc.CloseDropDown();
            } 

            protected override void OnDrawItem(DrawItemEventArgs die) {
                base.OnDrawItem(die);
 
                if (die.Index != -1) {
                    Cursor cursor = (Cursor)Items[die.Index]; 
                    string text = cursorConverter.ConvertToString(cursor); 
                    Font font = die.Font;
                    Brush brushText = new SolidBrush(die.ForeColor); 

                    die.DrawBackground();
                    die.Graphics.FillRectangle(SystemBrushes.Control, new Rectangle(die.Bounds.X + 2, die.Bounds.Y + 2, 32, die.Bounds.Height - 4));
                    die.Graphics.DrawRectangle(SystemPens.WindowText, new Rectangle(die.Bounds.X + 2, die.Bounds.Y + 2, 32 - 1, die.Bounds.Height - 4 - 1)); 

                    cursor.DrawStretched(die.Graphics, new Rectangle(die.Bounds.X + 2, die.Bounds.Y + 2, 32, die.Bounds.Height - 4)); 
                    die.Graphics.DrawString(text, font, brushText, die.Bounds.X + 36, die.Bounds.Y + (die.Bounds.Height - font.Height)/2); 

                    brushText.Dispose(); 
                }
            }

            protected override bool ProcessDialogKey(Keys keyData) { 
                if ((keyData & Keys.KeyCode) == Keys.Return && (keyData & (Keys.Alt | Keys.Control)) == 0) {
                    OnClick( EventArgs.Empty ); 
                    return true; 
                }
 
                return base.ProcessDialogKey(keyData);
            }

            public void Start(IWindowsFormsEditorService edSvc, object value) { 
                this.edSvc = edSvc;
                this.value = value; 
 
                // Select the current cursor
                // 
                if (value != null) {
                    for (int i = 0; i < Items.Count; i++) {
                        if (Items[i] == value) {
                            SelectedIndex = i; 
                            break;
                        } 
                    } 
                }
            } 
        }
    }
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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CursorEditor.cs source code in C# .NET

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