// ============================================================================================================
// SetHtml, Render, Reset
// ============================================================================================================
public void SetHtml(string html, int width, bool collapseContent = false)
{
if (html == m_CachedHtml && m_MaxWidth == width && m_CollapseToContent == collapseContent)
{
return;
}
m_CachedHtml = html;
m_MaxWidth = width;
m_CollapseToContent = collapseContent;
Reset();
if (string.IsNullOrEmpty(html))
{
m_Root = null;
}
else
{
m_Root = ParseHtmlToBlocks(html);
GetAllImages(m_Root);
m_Links = GetAllHrefRegionsInBlock(m_Root);
DoLayout(m_Root, width);
if (Ascender != 0)
{
m_Root.Height -= Ascender; // ascender should always be negative.
}
}
}
/// <summary>
/// Renders all the elements in the root branch. At the same time, also sets areas for regions and href links.
/// TODO: code for setting areas for regions / hrefs belongs in layout code in HtmlDocument.
/// </summary>
public Texture2D Render(BlockElement root, int ascender, HtmlLinkList links)
{
SpriteBatchUI sb = Service.Get <SpriteBatchUI>();
GraphicsDevice graphics = sb.GraphicsDevice;
if (root == null || root.Width == 0 || root.Height == 0) // empty text string
{
return(new Texture2D(graphics, 1, 1));
}
uint[] pixels = new uint[root.Width * root.Height];
if (root.Err_Cant_Fit_Children)
{
for (int i = 0; i < pixels.Length; i++)
{
pixels[i] = 0xffffff00;
}
Tracer.Error("Err: Block can't fit children.");
}
else
{
unsafe
{
fixed(uint *ptr = pixels)
{
DoRenderBlock(root, ascender, links, ptr, root.Width, root.Height);
}
}
}
Texture2D texture = new Texture2D(graphics, root.Width, root.Height, false, SurfaceFormat.Color);
texture.SetData(pixels);
return(texture);
}
unsafe void DoRenderBlock(BlockElement root, int ascender, HtmlLinkList links, uint *ptr, int width, int height)
{
foreach (AElement e in root.Children)
{
int x = e.Layout_X;
int y = e.Layout_Y - ascender; // ascender is always negative.
StyleState style = e.Style;
if (e is CharacterElement)
{
IFont font = style.Font;
ICharacter character = font.GetCharacter((e as CharacterElement).Character);
// HREF links should be colored white, because we will hue them at runtime.
uint color = style.IsHREF ? 0xFFFFFFFF : Utility.UintFromColor(style.Color);
character.WriteToBuffer(ptr, x, y, width, height, font.Baseline, style.IsBold, style.IsItalic, style.IsUnderlined, style.DrawOutline, color, 0xFF000008);
// offset y by ascender for links...
if (character.YOffset < 0)
{
y += character.YOffset;
height -= character.YOffset;
}
}
else if (e is ImageElement)
{
ImageElement image = (e as ImageElement);
image.AssociatedImage.Area = new Rectangle(x, y, image.Width, image.Height);
if (style.IsHREF)
{
links.AddLink(style, new Rectangle(x, y, e.Width, e.Height));
image.AssociatedImage.LinkIndex = links.Count;
}
}
else if (e is BlockElement)
{
DoRenderBlock(e as BlockElement, ascender, links, ptr, width, height);
}
// set href link regions
if (style.IsHREF)
{
links.AddLink(style, new Rectangle(x, y, e.Width, e.Height));
}
}
}