ToolStripLabel.cs source code in C# .NET

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

 
namespace System.Windows.Forms { 
    using System;
    using System.ComponentModel; 
    using System.Drawing;
    using System.Drawing.Design;
    using System.Diagnostics;
    using System.Diagnostics.CodeAnalysis; 
    using System.Windows.Forms.ButtonInternal;
    using System.Security.Permissions; 
    using System.Security; 
    using System.Windows.Forms.Design;
 
    /// 
    /// 
    /// A non selectable winbar item
    ///  
    [ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability.ToolStrip)]
    public class ToolStripLabel : ToolStripItem { 
 
        private LinkBehavior linkBehavior = LinkBehavior.SystemDefault;
        private bool isLink = false, linkVisited = false; 

        private Color linkColor = Color.Empty;
        private Color activeLinkColor = Color.Empty;
        private Color visitedLinkColor = Color.Empty; 
        private Font hoverLinkFont, linkFont;
        private Cursor lastCursor; 
 

 

        /// 
        /// 
        /// A non selectable winbar item 
        /// 
        public ToolStripLabel() { 
        } 
        public ToolStripLabel(string text):base(text,null,null) {
        } 
        public ToolStripLabel(Image image):base(null,image,null) {
        }
        public ToolStripLabel(string text, Image image):base(text,image,null) {
        } 
        public ToolStripLabel(string text, Image image, bool isLink):this(text,image,isLink, null) {
        } 
        [SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")] 
        public ToolStripLabel(string text, Image image, bool isLink, EventHandler onClick):this(text,image,isLink,onClick,null) {
        } 
        [SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public ToolStripLabel(string text, Image image, bool isLink, EventHandler onClick, string name) : base(text,image,onClick,name) {
            IsLink = isLink;
        } 

        ///  
        public override bool CanSelect { 
            get { return (IsLink || DesignMode); }
        } 

        [
        DefaultValue(false),
        SRCategory(SR.CatBehavior), 
        SRDescription(SR.ToolStripLabelIsLinkDescr)
        ] 
        public bool IsLink { 
          get {
              return isLink; 
          }
          set {
              if (isLink != value) {
                  isLink = value; 
                  Invalidate();
              } 
          } 
        }
 
        [
        SRCategory(SR.CatAppearance),
        SRDescription(SR.ToolStripLabelActiveLinkColorDescr)
        ] 
        public Color ActiveLinkColor {
            get { 
                if (activeLinkColor.IsEmpty) { 
                    return IEActiveLinkColor;
                } 
                else {
                    return activeLinkColor;
                }
            } 
            set {
                if (activeLinkColor != value) { 
                    activeLinkColor = value; 
                    Invalidate();
                } 
            }
        }
        private Color IELinkColor {
          get { 
              return LinkUtilities.IELinkColor;
          } 
        } 

        private Color IEActiveLinkColor { 
          get {
              return LinkUtilities.IEActiveLinkColor;
          }
        } 
        private Color IEVisitedLinkColor {
          get { 
              return LinkUtilities.IEVisitedLinkColor; 
          }
        } 

        [
        DefaultValue(LinkBehavior.SystemDefault),
        SRCategory(SR.CatBehavior), 
        SRDescription(SR.ToolStripLabelLinkBehaviorDescr)
        ] 
        public LinkBehavior LinkBehavior { 
            get {
                return linkBehavior; 
            }
            set {
                //valid values are 0x0 to 0x3
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)LinkBehavior.SystemDefault, (int)LinkBehavior.NeverUnderline)) 
                {
                    throw new InvalidEnumArgumentException("LinkBehavior", (int)value, typeof(LinkBehavior)); 
                } 
                if (linkBehavior != value) {
                    linkBehavior = value; 
                    InvalidateLinkFonts();
                    Invalidate();
                }
            } 
        }
 
        [ 
        SRCategory(SR.CatAppearance),
        SRDescription(SR.ToolStripLabelLinkColorDescr) 
        ]
        public Color LinkColor {
            get {
                if (linkColor.IsEmpty) { 
                    return IELinkColor;
                } 
                else { 
                    return linkColor;
                } 
            }
            set {
                if (linkColor != value) {
                    linkColor = value; 
                    Invalidate();
                } 
            } 
        }
 
        [
        DefaultValue(false),
        SRCategory(SR.CatAppearance),
        SRDescription(SR.ToolStripLabelLinkVisitedDescr) 
        ]
        public bool LinkVisited { 
            get { 
                return linkVisited;
            } 
            set {
                if (linkVisited != value) {
                    linkVisited = value;
                    Invalidate(); 
                }
            } 
        } 

        [ 
        SRCategory(SR.CatAppearance),
        SRDescription(SR.ToolStripLabelVisitedLinkColorDescr)
        ]
        public Color VisitedLinkColor { 
            get {
                if (visitedLinkColor.IsEmpty) { 
                    return IEVisitedLinkColor; 
                }
                else { 
                    return visitedLinkColor;
                }
            }
            set { 
                if (visitedLinkColor != value) {
                    visitedLinkColor = value; 
                    Invalidate(); 
                }
            } 
        }

        /// 
        ///  
        ///     Invalidates the current set of fonts we use when painting
        ///     links.  The fonts will be recreated when needed. 
        ///  
        private void InvalidateLinkFonts() {
 
            if (linkFont != null) {
                linkFont.Dispose();
            }
 
            if (hoverLinkFont != null && hoverLinkFont != linkFont) {
                hoverLinkFont.Dispose(); 
            } 

            linkFont = null; 
            hoverLinkFont = null;
        }

        protected override void OnFontChanged(EventArgs e) { 
           InvalidateLinkFonts();
           base.OnFontChanged(e); 
        } 

 
        protected override void OnMouseEnter(EventArgs e) {
            if (IsLink) {
                ToolStrip parent = this.Parent;
                if (parent != null) { 
                    lastCursor = parent.Cursor;
                    parent.Cursor = Cursors.Hand; 
                } 
            }
            base.OnMouseEnter(e); 

        }

        protected override void OnMouseLeave(EventArgs e) { 
            if (IsLink) {
                ToolStrip parent = this.Parent; 
                if (parent != null) { 
                    parent.Cursor = lastCursor;
                } 
            }
            base.OnMouseLeave(e);

        } 

       private void ResetActiveLinkColor() 
       { 
            ActiveLinkColor = IEActiveLinkColor;
       } 

       private void ResetLinkColor()
       {
            LinkColor = IELinkColor; 
       }
 
       private void ResetVisitedLinkColor() 
       {
            VisitedLinkColor = IEVisitedLinkColor; 
       }

       [EditorBrowsable(EditorBrowsableState.Never)]
       private bool ShouldSerializeActiveLinkColor() { 
           return !activeLinkColor.IsEmpty;
       } 
 
       [EditorBrowsable(EditorBrowsableState.Never)]
       private bool ShouldSerializeLinkColor() { 
           return !linkColor.IsEmpty;
       }

       [EditorBrowsable(EditorBrowsableState.Never)] 
       private bool ShouldSerializeVisitedLinkColor() {
           return !visitedLinkColor.IsEmpty; 
       } 

 

        /// 
        /// Creates an instance of the object that defines how image and text
        /// gets laid out in the ToolStripItem 
        /// 
        internal override ToolStripItemInternalLayout CreateInternalLayout() { 
            return new ToolStripLabelLayout(this); 
        }
 
        [EditorBrowsable(EditorBrowsableState.Advanced)]
        protected override AccessibleObject CreateAccessibilityInstance() {
            return new ToolStripLabelAccessibleObject(this);
        } 

        ///  
        ///  
        /// 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.DrawLabelBackground(new ToolStripItemRenderEventArgs(e.Graphics, this)); 
 
                if ((DisplayStyle & ToolStripItemDisplayStyle.Image) == ToolStripItemDisplayStyle.Image) {
                    renderer.DrawItemImage(new ToolStripItemImageRenderEventArgs(e.Graphics, this, InternalLayout.ImageRectangle)); 
                }
                PaintText(e.Graphics);
            }
        } 

        internal void PaintText(Graphics g) { 
            ToolStripRenderer renderer = this.Renderer; 

            if ((DisplayStyle & ToolStripItemDisplayStyle.Text) == ToolStripItemDisplayStyle.Text) { 
                 Font font = this.Font;
                 Color textColor = this.ForeColor;
                 if (IsLink) {
                      LinkUtilities.EnsureLinkFonts(font, this.LinkBehavior, ref this.linkFont, ref this.hoverLinkFont); 

                      if (this.Pressed) { 
                          font = hoverLinkFont; 
                          textColor = this.ActiveLinkColor;
                      } 
                      else if (this.Selected) {
                          font = hoverLinkFont;
                          textColor = (this.LinkVisited) ? this.VisitedLinkColor : this.LinkColor;
                      } 
                      else {
                          font = linkFont; 
                          textColor = (this.LinkVisited) ? this.VisitedLinkColor : this.LinkColor; 
                      }
                  } 
                  Rectangle textRect = InternalLayout.TextRectangle;
                  renderer.DrawItemText(new ToolStripItemTextRenderEventArgs(g, this, this.Text, textRect, textColor, font, InternalLayout.TextFormat));
             }
        } 

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1720:AvoidTypeNamesInParameters")] // 'charCode' matches control.cs 
        [UIPermission(SecurityAction.LinkDemand, Window=UIPermissionWindow.AllWindows)] 
        protected internal override bool ProcessMnemonic(char charCode) {
            // checking IsMnemonic is not necessary - toolstrip does this for us. 
            if (ParentInternal != null) {
                if (!CanSelect) {
                    ParentInternal.SetFocusUnsafe();
                    ParentInternal.SelectNextToolStripItem(this, /*forward=*/true); 
                }
                else { 
                    FireEvent(ToolStripItemEventType.Click); 
                }
                return true; 

            }
            return false;
        } 

 
        [System.Runtime.InteropServices.ComVisible(true)] 
        [SuppressMessage("Microsoft.Performance", "CA1812:AvoidUninstantiatedInternalClasses")]
        internal class ToolStripLabelAccessibleObject : ToolStripItemAccessibleObject { 
            private ToolStripLabel ownerItem = null;

            public ToolStripLabelAccessibleObject(ToolStripLabel ownerItem) : base(ownerItem) {
              this.ownerItem = ownerItem; 
            }
 
            public override string DefaultAction { 
                get {
                    if (ownerItem.IsLink) { 
                        return SR.GetString(SR.AccessibleActionClick);
                    }
                    else {
                        return string.Empty; 
                    }
                } 
            } 

            public override void DoDefaultAction() { 
                if (ownerItem.IsLink) {
                    base.DoDefaultAction();
                }
            } 

            public override AccessibleRole Role { 
               get { 
                   AccessibleRole role = Owner.AccessibleRole;
                   if (role != AccessibleRole.Default) { 
                       return role;
                   }
                   return (ownerItem.IsLink) ? AccessibleRole.Link : AccessibleRole.StaticText;
               } 
            }
 
            public override AccessibleStates State { 
                get {
                    return base.State | AccessibleStates.ReadOnly; 
                }
            }
        }
        ///  
        ///  This class performs internal layout for the "split button button" portion of a split button.
        ///  Its main job is to make sure the inner button has the same parent as the split button, so 
        ///  that layout can be performed using the correct graphics context. 
        /// 
        private class ToolStripLabelLayout : ToolStripItemInternalLayout { 

             ToolStripLabel owner;

            public ToolStripLabelLayout(ToolStripLabel owner) : base(owner) { 
                this.owner = owner;
            } 
 
            protected override ToolStripItemLayoutOptions CommonLayoutOptions() {
               ToolStripItemLayoutOptions layoutOptions = base.CommonLayoutOptions(); 
               layoutOptions.borderSize = 0;
               return layoutOptions;
            }
        } 

    } 
 
}
 



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

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