Value *
TextSelection::GetPropertyValue (DependencyProperty *formatting) const
{
Value *value = start.GetParent()->GetValue (formatting);
Value *current_value;
DocumentWalker walker (start.GetParentNode(), DocumentWalker::Forward);
walker.Step ();// skip the ::Leave for the start node
while (true) {
IDocumentNode *node;
DocumentWalker::StepType step = walker.Step (&node);
switch (step) {
case DocumentWalker::Enter:
current_value = node->AsDependencyObject()->GetValue (formatting);
if (!Value::AreEqual (value, current_value))
return NULL;
if (node == end.GetParentNode())
return value;
case DocumentWalker::Leave:
break;
case DocumentWalker::Done:
// this shouldn't happen, but do we care?
g_warning ("TextSelecion::GetPropertyValue document walker found the end of the document before finding the selection end.");
break;
return NULL;
}
}
}
TextPointer
TextPointer::GetPositionInsideRun (int offset) const
{
DependencyObject *parent = GetParent ();
if (parent == NULL)
return *this;
if (offset > 0) {
if (parent->Is(Type::RUN)) {
int location = ResolveLocation ();
const char *text = ((Run*)parent)->GetText();
if ((guint)location < strlen (text))
return GetPositionAtOffset_np (1, LogicalDirectionForward);
}
// we're at the end of the run (or not in a run at all). we need to walk the document until we hit another run.
DocumentWalker walker (IDocumentNode::CastToIDocumentNode (parent), DocumentWalker::Forward);
walker.Step ();
while (true) {
IDocumentNode *node;
DocumentWalker::StepType type = walker.Step (&node);
switch (type) {
case DocumentWalker::Done:
// there is no position beyond this
return *this;
case DocumentWalker::Enter:
if (node->AsDependencyObject()->Is(Type::RUN))
return ((Run*)node->AsDependencyObject())->GetContentStart_np();
break;
case DocumentWalker::Leave:
// do nothing here
break;
}
}
}
else {
if (parent->Is(Type::RUN)) {
int location = ResolveLocation ();
if (location > 0)
return GetPositionAtOffset_np (-1, LogicalDirectionForward);
}
// we're at the start of the run (or not in a run at all). we need to walk the document until we hit another run.
DocumentWalker walker (IDocumentNode::CastToIDocumentNode (parent), DocumentWalker::Backward);
walker.Step ();
while (true) {
IDocumentNode *node;
DocumentWalker::StepType type = walker.Step (&node);
switch (type) {
case DocumentWalker::Done:
// there is no position before this
return *this;
case DocumentWalker::Enter:
if (node->AsDependencyObject()->Is(Type::RUN))
return ((Run*)node->AsDependencyObject())->GetContentEnd_np();
break;
case DocumentWalker::Leave:
// do nothing here
break;
}
}
}
return *this;
}