HtmlImageElement
sealed class HtmlImageElement : HtmlElement, IHtmlImageElement, IHtmlElement, IElement, INode, IEventTarget, IMarkupFormattable, IParentNode, IChildNode, INonDocumentTypeChildNode, IElementCssInlineStyle, IDisposable
Represents the image element.
using AngleSharp.Dom.Css;
using AngleSharp.Extensions;
using AngleSharp.Html;
using AngleSharp.Network;
using AngleSharp.Services.Media;
using System;
using System.Threading;
using System.Threading.Tasks;
namespace AngleSharp.Dom.Html
{
internal sealed class HtmlImageElement : HtmlElement, IHtmlImageElement, IHtmlElement, IElement, INode, IEventTarget, IMarkupFormattable, IParentNode, IChildNode, INonDocumentTypeChildNode, IElementCssInlineStyle, IDisposable
{
private readonly BoundLocation _src;
private CancellationTokenSource _cts;
private Task<IImageInfo> _imageTask;
public string ActualSource => Source;
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 _src.Href;
}
set {
_src.Href = 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 (_imageTask == null)
return 0;
if (!_imageTask.IsCompleted || _imageTask.Result == null)
return 0;
return _imageTask.Result.Width;
}
}
public int OriginalHeight {
get {
if (_imageTask == null)
return 0;
if (!_imageTask.IsCompleted || _imageTask.Result == null)
return 0;
return _imageTask.Result.Height;
}
}
public bool IsCompleted {
get {
if (_imageTask != null)
return _imageTask.IsCompleted;
return true;
}
}
public bool IsMap {
get {
return GetOwnAttribute(AttributeNames.IsMap) != null;
}
set {
SetOwnAttribute(AttributeNames.IsMap, value ? string.Empty : null);
}
}
public HtmlImageElement(Document owner, string prefix = null)
: base(owner, Tags.Img, prefix, NodeFlags.SelfClosing | NodeFlags.Special)
{
_src = new BoundLocation(this, AttributeNames.Src);
RegisterAttributeObserver(AttributeNames.Src, UpdateSource);
}
public void Dispose()
{
if (_cts != null)
_cts.Cancel();
_cts = null;
_imageTask = null;
}
private void UpdateSource(string value)
{
if (_cts != null)
_cts.Cancel();
if (!string.IsNullOrEmpty(value)) {
Url url = new Url(ActualSource);
_cts = new CancellationTokenSource();
_imageTask = LoadAsync(url, _cts.Token);
}
}
private async Task<IImageInfo> LoadAsync(Url url, CancellationToken cancel)
{
ResourceRequest request = this.CreateRequestFor(url);
IImageInfo result = await AwaitExtensions.ConfigureAwait(Owner.LoadResource<IImageInfo>(request, cancel), false);
this.FireSimpleEvent(EventNames.Load, false, false);
return result;
}
}
}