If you have your own renderobject subclass you can override:
virtual bool isChildAllowed(RenderObject*, RenderStyle*) const
{ return true; }
If you don't have your own subclass, then it's trickier. You
basically can suppress the creation of RenderTexts completely inside
bool Text::rendererIsNeeded(RenderStyle *style)
However, that function is extremely performance critical, so any code
that gets added to that function would need to be examined very
carefully.
You might want to study some of what SVG did on the DOM side of things
to suppress the creation of renderers. I believe Eric Seidel did that
work and could help you out. I suspect there might be similarities.
dave
([email protected])
On Aug 26, 2009, at 1:19 PM, Alex Milowski wrote:
On Wed, Aug 26, 2009 at 12:06 PM, Alex Milowski<[email protected]>
wrote:
In certain MathML constructs (e.g. mfenced) there are a number of
child
elements that make up the construct and need to be rendered. Any
text
between those child elements should be ignored. In fact, non-
whitespace
text in the wrong place is most certainly incorrect but something
that can be recovered from.
I don't want to remove the text from the DOM nodes but I need to
keep the RenderText instances from being created or displayed. What
is the correct way to do this?
I've been trying to handle this in the renderer but it seems like
that
is really too late. I though about changing the attach method to
exclude
such ignorable text.
Here's what works but it feels like a hack:
RenderBlock* none = new (renderArena()) RenderBlock(document());
RefPtr<RenderStyle> newStyle = RenderStyle::create();
newStyle->inheritFrom(style());
newStyle->setDisplay(INLINE_BLOCK);
newStyle->setMaxWidth(Length(0,Fixed));
newStyle->setMaxHeight(Length(0,Fixed));
newStyle->setOverflowX(OHIDDEN);
newStyle->setOverflowY(OHIDDEN);
none->setStyle(newStyle.release());
RenderBlock::addChild(none, beforeChild);
none->addChild(child);
I basically create an inline block with zero width and height and then
set the overflow to hidden.
--
--Alex Milowski
"The excellence of grammar as a guide is proportional to the paucity
of the
inflexions, i.e. to the degree of analysis effected by the language
considered."
Bertrand Russell in a footnote of Principles of Mathematics
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