/// Scrollbar Parameters.
struct ScrollbarParameters
{
+ // These parameters are normalized against the screen geometry and pixel
+ // coordinates. Position 0 corresponds to the top the the screen.
ScrollbarParameters()
- : min(0), max(0), position(0), single_step(1), page_step(1)
+ : min(0), max(0), single_step(1), page_step(1)
{}
/// Minimum scrollbar position in pixels.
int min;
/// Maximum scrollbar position in pixels.
int max;
- /// Current position in the document in pixels.
- int position;
/// Line-scroll amount in pixels.
int single_step;
/// Page-scroll amount in pixels.
// Returns the amount of horizontal scrolling applied to the
// top-level row where the cursor lies
int horizScrollOffset() const;
-
- // Points to the top-level row where the cursor lies (during draw).
- CursorSlice const & currentRowSlice() const;
-
- // Points to the top-level row where the cursor lied at last draw event.
- CursorSlice const & lastRowSlice() const;
+ // Returns the amount of horizontal scrolling applied to the
+ // row of text starting at (pit, pos)
+ int horizScrollOffset(Text const * text,
+ pit_type pit, pos_type pos) const;
+
+ // Returns true if the row of text starting at (pit, pos) was scrolled
+ // at the last draw event.
+ bool hadHorizScrollOffset(Text const * text,
+ pit_type pit, pos_type pos) const;
/// reset the scrollbar to reflect current view position.
void updateScrollbar();