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HTML Widget
Composite widget consisting of a drawingArea widget and horizontal and
vertical scrollbars.
Resources
pic_data = resolveImageFunction (w, src, noload)
pic_data = resolveDelayedImage (w, src)
Callbacks
anchorCallback (w, cbdata) called when href is selected
linkCallback (w, cbdata) called during set text for <LINK> tags
submitFormCallback (w, cbdata) called when form is submitted
LinkInfo: href role
anchorCallback: event element_id text href
formCallback: event href method enctype enc_entity
attrib_count attrib_names attrib_values
Public Functions
HTMLGetText (w, pretty) # text or Postscript
HTMLPositionToId (w, x, y) # find nearest element
HTMLIdToPosition (w, element_id, x, y) # cvt id to position
HTMLGotoId (w, element_id) # scroll window to element
HTMLAnchorToPosition (w, name, x, y) # pos of anchor given name
HTMLAnchorToId (w, name) # id of anchor given name
list = HTMLGetHRefs (w, num_hrefs) # HREFs of all active anchors
HTMLGetImageSrcs (w, num_srcs) # SRCs of all images in doc
HTMLGetLinks (w, num_links) # get list of LINK tags in doc
HTMLGetWidgetInfo (w) # get widget list
HTMLFreeImageInfo (w) # free image resources
HTMLFreeWidgetInfo (ptr) # free WidgetInfo struct
** HTMLRetestAnchors (w, testFunc, data) # redraw all active anchors
HTMLSetSelection (w, start, end) # set selection by ElementRef
HTMLClearSelection (w) # clear selection
HTMLGetTextAndSelection(w,startp,endp,insertp) # get selection
HTMLSetText (w, text, header_text, # set document text
footer_text, element_id, target_anchor, ptr)
HTMLSearchText (w, pattern, m_start, # search text -> ElementRefs
m_end, backward, caseless)
LOCAL REVISIONS
----------------------
Added a third argument (client_data for the callback function) to the
HTMLRetestAnchors function. This required changes to several files.
Likewise, added a client_data argument to the pointer motion callback.
Mosaic in its callbacks would assume that the HTML widget was being called
from within Mosaic, but this doesn't work in a more general setting.
Modified the HTML widget to add a custom Realize method. This calls the
realize method of the superclass and then makes a drawGC for the HTML
widget. This was necessary to avoid segvios occuring when something is
drawn in the window before the application becomes idle and the widget
processes the first Expose event, as the widget would create the GC only
in response to the expose event.
Added a "scroll" action to the widget and modified the default HTML
translations to add u/d and j/k keys to permit vertical scrolling using the
keyboard instead of the scroll bars.
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