Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / WebControls / ImageMap.cs / 1305376 / ImageMap.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls { using System; using System.ComponentModel; using System.Globalization; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.Util; using System.Web; ////// [ DefaultEvent("Click"), DefaultProperty("HotSpots"), ParseChildren(true, "HotSpots"), SupportsEventValidation, ] public class ImageMap : Image, IPostBackEventHandler { private static readonly object EventClick = new object(); private bool _hasHotSpots; private HotSpotCollection _hotSpots; [ Browsable(true), EditorBrowsableAttribute(EditorBrowsableState.Always) ] public override bool Enabled { get { return base.Enabled; } set { base.Enabled = value; } } ///ImageMap class. Provides support for multiple /// region-defined actions within an image. ////// [ WebCategory("Behavior"), WebSysDescription(SR.ImageMap_HotSpots), DesignerSerializationVisibility(DesignerSerializationVisibility.Content), NotifyParentProperty(true), PersistenceMode(PersistenceMode.InnerDefaultProperty) ] public HotSpotCollection HotSpots { get { if (_hotSpots == null) { _hotSpots = new HotSpotCollection(); if (IsTrackingViewState) { ((IStateManager)_hotSpots).TrackViewState(); } } return _hotSpots; } } ///Gets the HotSpotCollection with defines the regions of ImageMap hot spots. ////// [ WebCategory("Behavior"), DefaultValue(HotSpotMode.NotSet), WebSysDescription(SR.HotSpot_HotSpotMode), ] public virtual HotSpotMode HotSpotMode { get { object obj = ViewState["HotSpotMode"]; return (obj == null) ? HotSpotMode.NotSet : (HotSpotMode)obj; } set { if (value < HotSpotMode.NotSet || value > HotSpotMode.Inactive) { throw new ArgumentOutOfRangeException("value"); } ViewState["HotSpotMode"] = value; } } ///Gets or sets the HotSpotMode to either postback or navigation. ////// [ WebCategory("Behavior"), DefaultValue(""), WebSysDescription(SR.HotSpot_Target), ] public virtual string Target { get { object value = ViewState["Target"]; return (value == null)? String.Empty : (string)value; } set { ViewState["Target"] = value; } } ///Gets or sets the name of the window for navigation. ////// [ Category("Action"), WebSysDescription(SR.ImageMap_Click) ] public event ImageMapEventHandler Click { add { Events.AddHandler(EventClick, value); } remove { Events.RemoveHandler(EventClick, value); } } ///The event raised when a hotspot is clicked. ////// /// protected override void AddAttributesToRender(HtmlTextWriter writer) { base.AddAttributesToRender(writer); if (_hasHotSpots) { writer.AddAttribute(HtmlTextWriterAttribute.Usemap, "#ImageMap" + ClientID, false); } } ///Overridden to add the "usemap" attribute the the image tag. /// Overrides WebControl.AddAttributesToRender. ////// protected override void LoadViewState(object savedState) { object baseState = null; object[] myState = null; if (savedState != null) { myState = (object[])savedState; if (myState.Length != 2) { throw new ArgumentException(SR.GetString(SR.ViewState_InvalidViewState)); } baseState = myState[0]; } base.LoadViewState(baseState); if ((myState != null) && (myState[1] != null)) { ((IStateManager)HotSpots).LoadViewState(myState[1]); } } ///Restores view-state information that was saved by SaveViewState. /// Implements IStateManager.LoadViewState. ////// protected virtual void OnClick(ImageMapEventArgs e) { ImageMapEventHandler clickHandler = (ImageMapEventHandler)Events[EventClick]; if (clickHandler != null) { clickHandler(this, e); } } ///Called when the user clicks the ImageMap. ////// /// protected internal override void Render(HtmlTextWriter writer) { if (Enabled && !IsEnabled && SupportsDisabledAttribute) { // We need to do the cascade effect on the server, because the browser // only renders as disabled, but doesn't disable the functionality. writer.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled"); } _hasHotSpots = ((_hotSpots != null) && (_hotSpots.Count > 0)); base.Render(writer); if (_hasHotSpots) { string fullClientID = "ImageMap" + ClientID; writer.AddAttribute(HtmlTextWriterAttribute.Name, fullClientID); writer.AddAttribute(HtmlTextWriterAttribute.Id, fullClientID); writer.RenderBeginTag(HtmlTextWriterTag.Map); HotSpotMode mapMode = HotSpotMode; if (mapMode == HotSpotMode.NotSet) { mapMode = HotSpotMode.Navigate; } HotSpotMode spotMode; int hotSpotIndex = 0; string controlTarget = Target; foreach (HotSpot item in _hotSpots) { writer.AddAttribute(HtmlTextWriterAttribute.Shape, item.MarkupName, false); writer.AddAttribute(HtmlTextWriterAttribute.Coords, item.GetCoordinates()); spotMode = item.HotSpotMode; if (spotMode == HotSpotMode.NotSet) { spotMode = mapMode; } if (spotMode == HotSpotMode.PostBack) { // Make sure the page has a server side form if we are posting back if (Page != null) { Page.VerifyRenderingInServerForm(this); } if ((RenderingCompatibility < VersionUtil.Framework40) || IsEnabled) { string eventArgument = hotSpotIndex.ToString(CultureInfo.InvariantCulture); writer.AddAttribute(HtmlTextWriterAttribute.Href, Page.ClientScript.GetPostBackClientHyperlink(this, eventArgument, true)); } } else if (spotMode == HotSpotMode.Navigate) { if ((RenderingCompatibility < VersionUtil.Framework40) || IsEnabled) { String resolvedUrl = ResolveClientUrl(item.NavigateUrl); writer.AddAttribute(HtmlTextWriterAttribute.Href, resolvedUrl); } // Use HotSpot target first, if not specified, use ImageMap's target string target = item.Target; if (target.Length == 0) target = controlTarget; if (target.Length > 0) writer.AddAttribute(HtmlTextWriterAttribute.Target, target); } else if (spotMode == HotSpotMode.Inactive) { writer.AddAttribute("nohref", "true"); } writer.AddAttribute(HtmlTextWriterAttribute.Title, item.AlternateText); writer.AddAttribute(HtmlTextWriterAttribute.Alt, item.AlternateText); string s = item.AccessKey; if (s.Length > 0) { writer.AddAttribute(HtmlTextWriterAttribute.Accesskey, s); } int n = item.TabIndex; if (n != 0) { writer.AddAttribute(HtmlTextWriterAttribute.Tabindex, n.ToString(NumberFormatInfo.InvariantInfo)); } writer.RenderBeginTag(HtmlTextWriterTag.Area); writer.RenderEndTag(); ++hotSpotIndex; } writer.RenderEndTag(); // Map } } ///Sends server control content to a provided HtmlTextWriter, which writes the content /// to be rendered to the client. /// Overrides Control.Render. ////// protected override object SaveViewState() { object baseState = base.SaveViewState(); object hotSpotsState = null; if ((_hotSpots != null) && (_hotSpots.Count > 0)) { hotSpotsState = ((IStateManager)_hotSpots).SaveViewState(); } if ((baseState != null) || (hotSpotsState != null)) { object[] savedState = new object[2]; savedState[0] = baseState; savedState[1] = hotSpotsState; return savedState; } return null; } ///Saves any server control view-state changes that have /// occurred since the time the page was posted back to the server. /// Implements IStateManager.SaveViewState. ////// protected override void TrackViewState() { base.TrackViewState(); if (_hotSpots != null) { ((IStateManager)_hotSpots).TrackViewState(); } } #region Implementation of IPostBackEventHandler ///Causes the tracking of view-state changes to the server control. /// Implements IStateManager.TrackViewState. ////// /// void IPostBackEventHandler.RaisePostBackEvent(string eventArgument) { RaisePostBackEvent(eventArgument); } ///Notifies the server control that caused the postback that /// it should handle an incoming post back event. /// Implements IPostBackEventHandler. ////// /// protected virtual void RaisePostBackEvent(string eventArgument) { ValidateEvent(UniqueID, eventArgument); string postBackValue = null; if (eventArgument != null && _hotSpots != null) { int hotSpotIndex = Int32.Parse(eventArgument, CultureInfo.InvariantCulture); if (hotSpotIndex >= 0 && hotSpotIndex < _hotSpots.Count) { HotSpot hotSpot = _hotSpots[hotSpotIndex]; HotSpotMode mode = hotSpot.HotSpotMode; if (mode == HotSpotMode.NotSet) { mode = HotSpotMode; } if (mode == HotSpotMode.PostBack) { postBackValue = hotSpot.PostBackValue; } } } // Ignore invalid indexes silently(VSWhidbey 185738) if (postBackValue != null) { OnClick(new ImageMapEventArgs(postBackValue)); } } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.Notifies the server control that caused the postback that /// it should handle an incoming post back event. /// Implements IPostBackEventHandler. ///
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