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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