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//
// GeckoHtmlRender.cs: Implementation of IHtmlRender that uses Gecko
//
// Author: Mario Sopena
// Author: Rafael Ferreira <raf@ophion.org>
//
using System;
using System.Text;
using System.IO;
using System.Collections;
using Gecko;
using Gtk;
#if USE_GTKHTML_PRINT
using Gnome;
#endif
namespace Monodoc {
public class GeckoHtmlRender : IHtmlRender {
//Images are cached in a temporal directory
Hashtable cache_imgs;
string tmpPath;
WebControl html_panel;
Viewport panel;
public Widget HtmlPanel {
get { return (Widget) panel; }
}
string url;
public string Url {
get { return url; }
}
RootTree help_tree;
public event EventHandler OnUrl;
public event EventHandler UrlClicked;
public GeckoHtmlRender (RootTree help_tree)
{
this.help_tree = help_tree;
tmpPath = Path.Combine (Path.GetTempPath(), "monodoc");
html_panel = new WebControl (tmpPath, "MonodocGecko");
html_panel.Show(); //due to Gecko bug
html_panel.OpenUri += OnOpenUri;
html_panel.LinkMsg += OnLinkMsg;
panel = new Viewport();
panel.Add (html_panel);
cache_imgs = new Hashtable();
}
protected void OnOpenUri (object o, OpenUriArgs args)
{
url = CheckUrl (args.AURI);
// if the file is cached on disk, return
if (url.StartsWith ("file:///"))
return;
if (UrlClicked != null)
UrlClicked (this, new EventArgs());
args.RetVal = true; //this prevents Gecko to continue processing
}
protected void OnLinkMsg (object o, EventArgs args)
{
url = CheckUrl (html_panel.LinkMessage);
if (OnUrl != null)
OnUrl (this, args);
}
// URL like T:System.Activator are lower cased by gecko to t.;System.Activator
// so we revert that
string CheckUrl (string u)
{
if (u.IndexOf (':') == 1)
return Char.ToUpper (u[0]) + u.Substring (1);
return u;
}
/* NOT ALREADY IMPLEMENTED */
public void JumpToAnchor (string anchor_name)
{
}
/* NOT ALREADY IMPLEMENTED */
public void Copy() {}
/* NOT ALREADY IMPLEMENTED */
public void SelectAll() {}
static int tmp_file = 0;
public void Render (string html_code)
{
string r = ProcessImages (html_code);
// if the html code is too big, write it down to a tmp file
if (((uint) r.Length) > 50000) {
string filename = (tmp_file++) + ".html";
string filepath = Path.Combine (tmpPath, filename);
using (FileStream file = new FileStream (filepath, FileMode.Create)) {
StreamWriter sw = new StreamWriter (file);
sw.Write (r);
sw.Close ();
}
html_panel.LoadUrl (filepath);
} else {
html_panel.OpenStream ("file:///", "text/html");
html_panel.AppendData (r);
html_panel.CloseStream ();
}
}
// Substitute the src of the images with the appropriate path
string ProcessImages (string html_code)
{
//If there are no Images return fast
int pos = html_code.IndexOf ("<img", 0, html_code.Length);
if (pos == -1)
return html_code;
StringBuilder html = new StringBuilder ();
html.Append (html_code.Substring (0, pos));
int srcIni, srcEnd;
string Img;
Stream s;
string path, img_name;
while (pos != -1) {
//look for the src of the img
srcIni = html_code.IndexOf ("src=\"", pos);
srcEnd = html_code.IndexOf ("\"", srcIni+6);
Img = html_code.Substring (srcIni+5, srcEnd-srcIni-5);
path = "NO_IMG";
//is the img cached?
if (cache_imgs.Contains(Img)) {
path = (string) cache_imgs[Img];
} else {
//obtain the stream from the compressed sources
s = help_tree.GetImage (Img);
if (s != null) {
//write the file to a tmp directory
img_name = Img.Substring (Img.LastIndexOf (":")+1);
path = Path.Combine (tmpPath, img_name);
Directory.CreateDirectory (Path.GetDirectoryName (path));
FileStream file = new FileStream (path, FileMode.Create);
byte[] buffer = new byte [8192];
int n;
while ((n = s.Read (buffer, 0, 8192)) != 0)
file.Write (buffer, 0, n);
file.Flush();
file.Close();
System.Console.WriteLine("Cache: {0}", path);
//Add the image to the cache
cache_imgs[Img] = path;
}
}
//Add the html code from <img until src="
html.Append (html_code.Substring (pos, srcIni + 5 - pos));
//Add the Image path
html.Append (path);
//Look for the next image
pos = html_code.IndexOf ("<img", srcIni);
if (pos == -1)
//Add the rest of the file
html.Append (html_code.Substring (srcEnd));
else
//Add from " to the next <img
html.Append (html_code.Substring (srcEnd, pos - srcEnd)); //check this
}
return html.ToString();
}
public void Print (string Html) {
if (Html == null) {
Console.WriteLine ("empty print");
return;
}
Console.WriteLine ("XXXX");
#if !USE_GTKHTML_PRINT
MessageDialog md = new MessageDialog (null,
DialogFlags.DestroyWithParent,
MessageType.Error,
ButtonsType.Close, "Printing not supported without gtkhtml");
int result = md.Run ();
md.Destroy();
#else
string Caption = "Monodoc Printing";
Gnome.PrintJob pj = new Gnome.PrintJob (PrintConfig.Default ());
PrintDialog dialog = new PrintDialog (pj, Caption, 0);
Gtk.HTML gtk_html = new Gtk.HTML (Html);
gtk_html.PrintSetMaster (pj);
Gnome.PrintContext ctx = pj.Context;
gtk_html.Print (ctx);
pj.Close ();
// hello user
int response = dialog.Run ();
if (response == (int) PrintButtons.Cancel) {
dialog.Hide ();
dialog.Dispose ();
return;
} else if (response == (int) PrintButtons.Print) {
pj.Print ();
} else if (response == (int) PrintButtons.Preview) {
new PrintJobPreview (pj, Caption).Show ();
}
ctx.Close ();
dialog.Hide ();
dialog.Dispose ();
return;
#endif
}
}
}
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