class TGHtml: public TGView

 Erase all HTML from this widget and clear the screen. This is
 typically done before loading a new document.

 Appends (or insert at the specified position) the given HTML text to the
 end of any HTML text that may have been inserted by prior calls to this
 command.  Then it runs the tokenizer, parser and layout engine as far as
 possible with the text that is available. The display is updated
 appropriately.

 Given a string, this procedure returns a unique identifier for the
 string.

 This procedure returns a pointer to a new char string corresponding to
 the "string" argument. The new string has a value identical to string
 (strcmp will return 0), but it's guaranteed that any other calls to this
 procedure with a string equal to "string" will return exactly the same
 result (i.e. can compare pointer *values* directly, without having to
 call strcmp on what they point to).

 Clear the cache of GCs

 Reset the main layout context in the main widget.  This happens
 before we redo the layout, or just before deleting the widget.

 This routine is invoked in order to redraw all or part of the HTML
 widget. This might happen because the display has changed, or in
 response to an expose event. In all cases, though, this routine
 is called by an idle handler.

 Make sure that a call to the Redraw() routine has been queued.

 If any part of the screen needs to be redrawn, then call this routine
 with the values of a box (in window coordinates) that needs to be
 redrawn. This routine will schedule an idle handler to do the redraw.

 The box coordinates are relative to the clipping window (fCanvas).

 Redraw the TGHtmlBlock given.

 Call this routine to force the entire widget to be redrawn.

 Call this routine to cause all of the rendered HTML at the
 virtual canvas coordinate of Y and beyond to be redrawn.

 Erase all data from the HTML widget. Bring it back to an empty screen.

 Flash the insertion cursor.

 Return a GC from the cache.  As many as N_CACHE_GCs are kept valid
 at any one time.  They are replaced using an LRU algorithm.

 A value of FONT_Any (-1) for the font means "don't care".

 Retrieve any valid GC. The font and color don't matter since the
 GC will only be used for copying.

 This routine searchs for a hyperlink beneath the coordinates x,y
 and returns a pointer to the HREF for that hyperlink. The text
 is held in one of the markup argv[] fields of the <a> markup.

 Emit ButtonClicked() signal.

 Emit CheckToggled() signal.

 Emit RadioChanged() signal.

 Emit SubmitClicked() signal.

 handle mouse motion events

 The rendering and layout routines should call this routine in order to
 get a font structure. The iFont parameter specifies which of the N_FONT
 fonts should be obtained. The font is allocated if necessary.

 Only support rect and circles for now

 This routine returns an index between 0 and N_COLOR-1 which indicates
 which ColorStruct_t structure in the apColor[] array should be used to describe
 the color specified by the given name.

 Check to see if the given color is too dark to be easily distinguished
 from black.

 Given that the background color is iBgColor, figure out an
 appropriate color for the dark part of a 3D shadow.

 Check to see if the given color is too light to be easily distinguished
 from white.

 Given that the background color is iBgColor, figure out an
 appropriate color for the bright part of the 3D shadow.

 Find a color integer for the color whose color components
 are given by pRef.

 This routine searchs for a hyperlink beneath the coordinates x,y
 and returns a pointer to the HREF for that hyperlink. The text
 is held in one of the markup argv[] fields of the <a> markup.

 Return coordinates of item

 Given the selection end-points in selBegin and selEnd, recompute
 pSelBeginBlock and pSelEndBlock, then call UpdateSelectionDisplay()
 to update the display.

 This routine should be called whenever the selection changes or
 whenever the set of TGHtmlBlock structures change.

 The pSelStartBlock and pSelEndBlock values have been changed.
 This routine's job is to loop over all TGHtmlBlocks and either
 set or clear the HTML_Selected bits in the .flags field
 as appropriate.  For every TGHtmlBlock where the bit changes,
 mark that block for redrawing.

 Recompute the position of the insertion cursor based on the
 position in ins.

 User function to resolve URIs

 User function to get an image from a URL

 User function to tell if a hyperlink has already been visited

 User function to to process tokens of the given type

 The HTML parser will invoke the following methods from time
 to time to find out information it needs to complete formatting of
 the document.
 Method for handling <frameset> markup

 Method to process applets

 Called when parsing forms

 Called when user presses Submit

 Invoked to find font names

 Invoked for each <SCRIPT> markup