/// <summary>
/// Extracts source from anchor.
/// </summary>
/// <param name="htmlNode"></param>
/// <param name="element"></param>
private static void ExtractHref(HtmlNode htmlNode, ref Elements.BaseElement element)
{
if (htmlNode.Attributes.Contains("href"))
{
((Elements.Text)element).Href = htmlNode.Attributes["href"].Value;
}
}
/// <summary>
/// Extracts identifier from nodes (for table of contents linkng).
/// </summary>
/// <param name="htmlNode"></param>
/// <param name="element"></param>
private static void ExtractId(HtmlNode htmlNode, ref Elements.BaseElement element)
{
if (htmlNode.Attributes.Contains("id"))
{
element.Identifiers.Add(htmlNode.Attributes["id"].Value);
}
// we have to also extract id's from parents
if (htmlNode.ParentNode != null)
{
ExtractId(htmlNode.ParentNode, ref element);
}
}
private void Navigate(string src)
{
// extract href / id
string itemHref, id;
if (src.StartsWith("#", StringComparison.OrdinalIgnoreCase))
{
itemHref = String.Empty;
id = src.Substring(1);
}
else if (src.Contains('#'))
{
itemHref = src.Substring(0, src.IndexOf('#'));
id = src.Substring(src.IndexOf('#') + 1);
}
else
{
itemHref = src;
id = String.Empty;
}
// remove directiories from href
itemHref = GetFileName(itemHref);
// find location
int loc = 0;
for (int i = 0; i < Book.ItemElementsContainers.Count; i++)
{
ItemElementsContainer iec = Book.ItemElementsContainers[i];
for (int j = 0; j < iec.Elements.Count; j++)
{
Elements.BaseElement element = iec.Elements[j];
if (
(String.IsNullOrEmpty(itemHref) || GetFileName(iec.Item.Href).Equals(itemHref, StringComparison.OrdinalIgnoreCase))
&&
(String.IsNullOrEmpty(id) || (!String.IsNullOrEmpty(id) && element.Identifiers.Contains(id)))
)
{
// change state (from TOC view)
State = EPubReader.State.Normal;
// set location
CurrentLocation = loc + j;
// exit
return;
}
}
loc += iec.Elements.Count;
}
}
/// <summary>
/// Render item elements container
/// </summary>
/// <param name="iec"></param>
internal void Render(ItemElementsContainer iec)
{
#if DEBUG
Stopwatch sw = new Stopwatch();
sw.Start();
#endif
int currentLocation = iec.StartLocation;
Page page = CreatePage(currentLocation);
double top = 0;
for (int i = 0; i < iec.Elements.Count; i++)
{
Elements.BaseElement element = iec.Elements[i];
if (element is Elements.Break)
{
RenderBreak(iec, currentLocation, ref page, ref top);
}
else if (element is Elements.Image)
{
RenderImage(iec, currentLocation, ref page, ref top, element);
}
else if (element is Elements.Line)
{
RenderLine(iec, currentLocation, ref page, ref top);
}
else if (element is Elements.Text)
{
RenderText(iec, currentLocation, ref page, ref top, element);
}
if (i < iec.Elements.Count - 1)
{
currentLocation++;
}
}
// we push page even doesnt have any content
page.EndLocation = currentLocation;
// add page to list
iec.Pages.Add(page);
#if DEBUG
sw.Stop();
Debug.WriteLine(String.Format(CultureInfo.InvariantCulture, "Information: EPubReader.Renderer.Render(\"{1}\") - Executed in {0} ms", sw.ElapsedMilliseconds.ToString(CultureInfo.InvariantCulture), iec.Item.Href));
#endif
}
private void RenderText(ItemElementsContainer iec, int currentLocation, ref Page page, ref double top, Elements.BaseElement element)
{
Elements.Text textElement = (Elements.Text)element;
string value = " " + textElement.Value;
TextBlock tb = ExtractTextBlock(ref page, top);
double prevTextBlockActualHeight = tb.ActualHeight;
tb.Inlines.Add(CreateRun(textElement, value));
double textBlockActualHeight = tb.ActualHeight - prevTextBlockActualHeight;
// check if fits (in most cases it will pass, because of short paragraphs)
if (top + textBlockActualHeight > page.Content.Height)
{
// remove inline
tb.Inlines.RemoveAt(tb.Inlines.Count - 1);
int idx = 1;
string[] parts = value.Split(' ');
while (true)
{
string text = StringJoin(' ', parts, idx);
prevTextBlockActualHeight = tb.ActualHeight;
tb.Inlines.Add(CreateRun(textElement, text));
textBlockActualHeight = tb.ActualHeight - prevTextBlockActualHeight;
if (top + textBlockActualHeight > page.Content.Height)
{
// remove inline
tb.Inlines.RemoveAt(tb.Inlines.Count - 1);
// push prev text
// it could be empty if nothing fits
string prevText = null;
if (idx > 1)
{
prevText = StringJoin(' ', parts, idx - 1);
tb.Inlines.Add(CreateRun(textElement, prevText));
}
PushPage(iec, ref page, currentLocation, ref top);
// render rest of text
if (idx > 1)
{
textElement.Value = value.Substring(prevText.Length);
}
else
{
textElement.Value = value;
}
RenderText(iec, currentLocation, ref page, ref top, element);
break;
}
else
{
// remove inline
tb.Inlines.RemoveAt(tb.Inlines.Count - 1);
}
idx++;
}
}
else
{
// create anchor rect if href isn't null
if (!String.IsNullOrEmpty(textElement.Href))
{
AnchorRect anchorRect = new AnchorRect();
anchorRect.Href = textElement.Href;
anchorRect.Rect = new Rect(
_ePubViewer.ContentMargin.Left,
(textBlockActualHeight == 0) ? top - _ePubViewer.LineHeight : top,
_ePubViewer.ContentSize.Width,
(textBlockActualHeight == 0) ? _ePubViewer.LineHeight : textBlockActualHeight);
page.AnchorRects.Add(anchorRect);
}
top += textBlockActualHeight;
}
}
private void RenderImage(ItemElementsContainer iec, int currentLocation, ref Page page, ref double top, Elements.BaseElement element)
{
Elements.Image imageElement = (Elements.Image)element;
// create UI element
Image image = new Image();
image.Tag = imageElement;
Binding binding = new Binding("Tag");
binding.RelativeSource = new RelativeSource(RelativeSourceMode.Self);
binding.Converter = new Converters.IsolatedStorageFileToImageSourceConverter();
binding.ConverterParameter = _ePubViewer.Book;
BindingOperations.SetBinding(image, Image.SourceProperty, binding);
// check size of image (it it's larger then entire space)
if (imageElement.Width + image.Margin.Left + image.Margin.Right > page.Content.Width
||
imageElement.Height + image.Margin.Top + image.Margin.Bottom > page.Content.Height)
{
// image bigger then size of control
if (page.Content.Children.Count > 0)
{
PushPage(iec, ref page, currentLocation, ref top);
}
// count new width / height
double widthRatio = (double)imageElement.Width / page.Content.Width;
double heightRatio = (double)imageElement.Height / page.Content.Height;
double ratio = Math.Max(widthRatio, heightRatio);
image.Width = (int)((double)imageElement.Width / ratio);
image.Height = (int)((double)imageElement.Height / ratio);
image.Stretch = Stretch.Uniform;
image.SetValue(Canvas.TopProperty, top);
page.Content.Children.Add(image);
}
else
{
// image smaller then size of control
// try fit current page
if (top + imageElement.Height + image.Margin.Top + image.Margin.Bottom > page.Content.Height)
{
PushPage(iec, ref page, currentLocation, ref top);
}
image.Width = imageElement.Width;
image.Height = imageElement.Height;
image.Stretch = Stretch.None;
image.SetValue(Canvas.TopProperty, top);
page.Content.Children.Add(image);
}
top += image.Height + image.Margin.Top + image.Margin.Bottom;
}
