* LyXView:

[lyx.git] / src / CursorSlice.cpp

diff --git a/src/CursorSlice.cpp b/src/CursorSlice.cpp
index 710f65c80419c0e2623700c66b8ce7c0feebb961..0ff99882ec0ceedd1e8f60ca435fc562dcf2893b 100644 (file)
--- a/src/CursorSlice.cpp
+++ b/src/CursorSlice.cpp
@@ -26,10 +26,10 @@
 
 #include <boost/assert.hpp>
 
+using std::endl;
 
-namespace lyx {
 
-using std::endl;
+namespace lyx {
 
 
 CursorSlice::CursorSlice()
@@ -44,18 +44,6 @@ CursorSlice::CursorSlice(Inset & p)
 }
 
 
-void CursorSlice::invalidate()
-{
-       inset_ = 0;
-}
-
-
-bool CursorSlice::isValid() const
-{
-       return inset_ != 0;
-}
-
-
 MathData & CursorSlice::cell() const
 {
        return inset_->asInsetMath()->cell(idx_);
@@ -103,6 +91,71 @@ CursorSlice::col_type CursorSlice::col() const
 }
 
 
+void CursorSlice::forwardPos()
+{
+       //  move on one position if possible
+       if (pos() < lastpos()) {
+               //lyxerr << "... next pos" << endl;
+               ++pos();
+               return;
+       }
+
+       // otherwise move on one paragraph if possible
+       if (pit() < lastpit()) {
+               //lyxerr << "... next par" << endl;
+               ++pit();
+               pos() = 0;
+               return;
+       }
+
+       // otherwise try to move on one cell if possible
+       if (idx() < lastidx()) {
+               //lyxerr << "... next idx" << endl;
+               ++idx();
+               pit() = 0;
+               pos() = 0;
+               return;
+       }
+       BOOST_ASSERT(false);
+}
+
+
+void CursorSlice::backwardPos()
+{
+       if (pos() != 0) {
+               --pos();
+               return;
+       }
+
+       if (pit() != 0) {
+               --pit();
+               pos() = lastpos();
+               return;
+       }
+
+       if (idx() != 0) {
+               --idx();
+               pit() = lastpit();
+               pos() = lastpos();
+               return;
+       }
+
+       BOOST_ASSERT(false);
+}
+
+
+bool CursorSlice::at_end() const 
+{
+       return idx() == lastidx() && pit() == lastpit() && pos() == lastpos();
+}
+
+
+bool CursorSlice::at_begin() const
+{
+       return idx() == 0 && pit() == 0 && pos() == 0;
+}
+
+
 bool operator==(CursorSlice const & p, CursorSlice const & q)
 {
        return &p.inset() == &q.inset()