ToolStripButton.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / ToolStripButton.cs / 1 / ToolStripButton.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

 
namespace System.Windows.Forms { 
    using System;
    using System.Drawing; 
    using System.Windows.Forms;
    using System.Drawing.Imaging;
    using System.ComponentModel;
    using System.Windows.Forms.Design; 
    	
    ///  
    ///  
    [ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability.ToolStrip)]
    public class ToolStripButton : ToolStripItem { 

        private CheckState                 checkState                                   = CheckState.Unchecked;
        private bool                       checkOnClick                                 = false;
        private const int StandardButtonWidth = 23; 
        private static readonly object EventCheckedChanged      = new object();
        private static readonly object EventCheckStateChanged   = new object(); 
 
        /// 
        ///  
        /// Summary of ToolStripButton.
        /// 
        public ToolStripButton() {
            Initialize(); 
        }
        public ToolStripButton(string text):base(text,null,null) { 
            Initialize(); 
        }
        public ToolStripButton(Image image):base(null,image,null) { 
            Initialize();
        }
        public ToolStripButton(string text, Image image):base(text,image,null) {
            Initialize(); 
        }
        public ToolStripButton(string text, Image image, EventHandler onClick):base(text,image,onClick) { 
            Initialize(); 
        }
        public ToolStripButton(string text, Image image, EventHandler onClick, string name):base(text,image,onClick,name) { 
            Initialize();
        }

 
        [DefaultValue(true)]
        public new bool AutoToolTip { 
            get { 
                return base.AutoToolTip;
            } 
            set {
                base.AutoToolTip = value;
            }
        } 

 
        ///  
        /// 
        /// Summary of CanSelect. 
        /// 
        public override bool CanSelect {
            get {
                return true; 
            }
        } 
 
        /// 
        [ 
        DefaultValue(false),
        SRCategory(SR.CatBehavior),
        SRDescription(SR.ToolStripButtonCheckOnClickDescr)
        ] 
        public bool CheckOnClick {
            get { 
                return checkOnClick; 
            }
            set { 
                checkOnClick = value;
            }
        }
 
        /// 
        ///  
        ///  
        /// Gets or sets a value indicating whether the item is checked.
        ///  
        /// 
        [
        DefaultValue(false),
        SRCategory(SR.CatAppearance), 
        SRDescription(SR.ToolStripButtonCheckedDescr)
        ] 
        public bool Checked { 
            get {
                return checkState != CheckState.Unchecked; 
            }

            set {
                if (value != Checked) { 
                    CheckState = value ? CheckState.Checked : CheckState.Unchecked;
                    InvokePaint(); 
 
                }
            } 
        }

        /// 
        ///  
        /// Gets
        /// or sets a value indicating whether the check box is checked. 
        ///  
        [
        SRCategory(SR.CatAppearance), 
        DefaultValue(CheckState.Unchecked),
        SRDescription(SR.CheckBoxCheckStateDescr)
        ]
        public CheckState CheckState { 
            get {
                return checkState; 
            } 

            set { 
                //valid values are 0x0 to 0x2
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)CheckState.Unchecked, (int)CheckState.Indeterminate))
                {
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(CheckState)); 
                }
 
                if (value != checkState) { 
                    checkState = value;
                    Invalidate(); 
                    OnCheckedChanged(EventArgs.Empty);
                    OnCheckStateChanged(EventArgs.Empty);
                }
            } 
        }
 
        ///  
        /// 
        /// Occurs when the 
        /// value of the 
        /// property changes.
        /// 
        [SRDescription(SR.CheckBoxOnCheckedChangedDescr)] 
        public event EventHandler CheckedChanged {
            add { 
                Events.AddHandler(EventCheckedChanged, value); 
            }
            remove { 
                Events.RemoveHandler(EventCheckedChanged, value);
            }
        }
        ///  
        /// 
        /// Occurs when the 
        /// value of the  
        /// property changes.
        ///  
        [SRDescription(SR.CheckBoxOnCheckStateChangedDescr)]
        public event EventHandler CheckStateChanged {
            add {
                Events.AddHandler(EventCheckStateChanged, value); 
            }
            remove { 
                Events.RemoveHandler(EventCheckStateChanged, value); 
            }
        } 


        protected override bool DefaultAutoToolTip {
            get { 
                return true;
            } 
        } 

        ///  
        /// 
        /// constructs the new instance of the accessibility object for this ToolStripItem. Subclasses
        /// should not call base.CreateAccessibilityObject.
        ///  
        [EditorBrowsable(EditorBrowsableState.Advanced)]
        protected override AccessibleObject CreateAccessibilityInstance() { 
            return new ToolStripButtonAccessibleObject(this); 
        }
 
        public override Size GetPreferredSize(Size constrainingSize) {
           Size prefSize = base.GetPreferredSize(constrainingSize);
           prefSize.Width = Math.Max(prefSize.Width, StandardButtonWidth);
           return prefSize; 
        }
 
        ///  
        /// Called by all constructors of ToolStripButton.
        ///  
        private void Initialize() {
            SupportsSpaceKey = true;
        }
 
        /// 
        ///  
        /// Raises the  
        /// event.
        ///  
        protected virtual void OnCheckedChanged(EventArgs e) {
            EventHandler handler = (EventHandler)Events[EventCheckedChanged];
            if (handler != null) handler(this,e);
        } 

        ///  
        ///  
        /// Raises the  event.
        ///  
        protected virtual void OnCheckStateChanged(EventArgs e) {
            AccessibilityNotifyClients(AccessibleEvents.StateChange);
            EventHandler handler = (EventHandler)Events[EventCheckStateChanged];
            if (handler != null) handler(this,e); 
        }
 
        ///  
        /// 
        /// Inheriting classes should override this method to handle this event. 
        /// 
        protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) {

            if (this.Owner != null) { 
                ToolStripRenderer renderer = this.Renderer;
 
                renderer.DrawButtonBackground(new ToolStripItemRenderEventArgs(e.Graphics, this)); 

                if ((DisplayStyle & ToolStripItemDisplayStyle.Image) == ToolStripItemDisplayStyle.Image) { 
                    ToolStripItemImageRenderEventArgs rea = new ToolStripItemImageRenderEventArgs(e.Graphics, this, InternalLayout.ImageRectangle);
                    rea.ShiftOnPress = true;
                    renderer.DrawItemImage(rea);
                } 

                if ((DisplayStyle & ToolStripItemDisplayStyle.Text) == ToolStripItemDisplayStyle.Text) { 
                     renderer.DrawItemText(new ToolStripItemTextRenderEventArgs(e.Graphics, this, this.Text, InternalLayout.TextRectangle, this.ForeColor, this.Font, InternalLayout.TextFormat)); 
                }
            } 
        }

        /// 
        protected override void OnClick(EventArgs e) { 
            if (checkOnClick) {
                this.Checked = !this.Checked; 
            } 
            base.OnClick(e);
        } 

        /// 
        /// An implementation of AccessibleChild for use with ToolStripItems
        ///  
        [System.Runtime.InteropServices.ComVisible(true)]
        internal class ToolStripButtonAccessibleObject : ToolStripItemAccessibleObject { 
            private ToolStripButton ownerItem = null; 

            public ToolStripButtonAccessibleObject(ToolStripButton ownerItem): base(ownerItem) { 
                this.ownerItem = ownerItem;
            }

 
            public override AccessibleStates State {
               get { 
                    if (ownerItem.Enabled && ownerItem.Checked) { 
                        return base.State | AccessibleStates.Checked;
                    } 
                    return base.State;
               }
            }
 
        }
    } 
} 


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

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