HtmlImageElement
sealed class HtmlImageElement : HtmlElement, IHtmlImageElement, IHtmlElement, IElement, INode, IEventTarget, IMarkupFormattable, IParentNode, IChildNode, INonDocumentTypeChildNode, IElementCssInlineStyle
Represents the image element.
using AngleSharp.Dom.Css;
using AngleSharp.Extensions;
using AngleSharp.Html;
using AngleSharp.Network;
using AngleSharp.Services.Media;
using System.Threading.Tasks;
namespace AngleSharp.Dom.Html
{
internal sealed class HtmlImageElement : HtmlElement, IHtmlImageElement, IHtmlElement, IElement, INode, IEventTarget, IMarkupFormattable, IParentNode, IChildNode, INonDocumentTypeChildNode, IElementCssInlineStyle
{
private Url _lastSource;
private IImageInfo _img;
public string ActualSource {
get {
if (_lastSource == null)
return null;
return _lastSource.Href;
}
}
public string SourceSet {
get {
return GetOwnAttribute(AttributeNames.SrcSet);
}
set {
SetOwnAttribute(AttributeNames.SrcSet, value);
}
}
public string Sizes {
get {
return GetOwnAttribute(AttributeNames.Sizes);
}
set {
SetOwnAttribute(AttributeNames.Sizes, value);
}
}
public string Source {
get {
return GetUrlAttribute(AttributeNames.Src);
}
set {
SetOwnAttribute(AttributeNames.Src, value);
}
}
public string AlternativeText {
get {
return GetOwnAttribute(AttributeNames.Alt);
}
set {
SetOwnAttribute(AttributeNames.Alt, value);
}
}
public string CrossOrigin {
get {
return GetOwnAttribute(AttributeNames.CrossOrigin);
}
set {
SetOwnAttribute(AttributeNames.CrossOrigin, value);
}
}
public string UseMap {
get {
return GetOwnAttribute(AttributeNames.UseMap);
}
set {
SetOwnAttribute(AttributeNames.UseMap, value);
}
}
public int DisplayWidth {
get {
return GetOwnAttribute(AttributeNames.Width).ToInteger(OriginalWidth);
}
set {
SetOwnAttribute(AttributeNames.Width, value.ToString());
}
}
public int DisplayHeight {
get {
return GetOwnAttribute(AttributeNames.Height).ToInteger(OriginalHeight);
}
set {
SetOwnAttribute(AttributeNames.Height, value.ToString());
}
}
public int OriginalWidth {
get {
if (!IsCompleted)
return 0;
return _img.Width;
}
}
public int OriginalHeight {
get {
if (!IsCompleted)
return 0;
return _img.Height;
}
}
public bool IsCompleted => _img != null;
public bool IsMap {
get {
return HasOwnAttribute(AttributeNames.IsMap);
}
set {
SetOwnAttribute(AttributeNames.IsMap, value ? string.Empty : null);
}
}
public HtmlImageElement(Document owner, string prefix = null)
: base(owner, Tags.Img, prefix, NodeFlags.SelfClosing | NodeFlags.Special)
{
RegisterAttributeObserver(AttributeNames.Src, UpdateSource);
RegisterAttributeObserver(AttributeNames.SrcSet, UpdateSource);
RegisterAttributeObserver(AttributeNames.Sizes, UpdateSource);
RegisterAttributeObserver(AttributeNames.CrossOrigin, UpdateSource);
}
private void GetImage(Url source)
{
if (source.IsInvalid)
source = null;
else if (_lastSource != null && source.Equals(_lastSource)) {
return;
}
this.CancelTasks();
_lastSource = source;
if (source != null) {
ResourceRequest request = this.CreateRequestFor(source);
this.LoadResource<IImageInfo>(request).ContinueWith(delegate(Task<IImageInfo> m) {
if (!m.IsFaulted)
_img = m.Result;
this.FireLoadOrErrorEvent(m);
});
}
}
private void UpdateSource(string value)
{
GetImage(this.GetImageCandidate());
}
}
}