VerbatimFormatter.cpp

#include "VerbatimFormatter.h"

using namespace std;

VerbatimFormatter :: VerbatimFormatter(EditorDataController *edc)
: edc(edc),
  ra(0), ca(0),
  x(0), y(0),
  rows(0), cols(0)
{
}

VerbatimFormatter :: ~VerbatimFormatter()
{
}

// Settings

void VerbatimFormatter :: SetMaxWidth(int maxWidth)
{
  cols = maxWidth;
}

int VerbatimFormatter :: GetMaxWidth()
{
  return cols;
}

void VerbatimFormatter :: SetMaxHeight(int maxHeight)
{
  rows = maxHeight;
}

int VerbatimFormatter :: GetMaxHeight()
{
  return rows;
}

// Render Methods

void VerbatimFormatter :: Build()
{
  AdjustCoordinates();
}

int VerbatimFormatter :: GetRenderableLineCount()
{
  return edc->GetNumLines() - ra;
}

shared_ptr<string> VerbatimFormatter :: GetLine(int y)
{
  int endOfWindow = ca+cols;
  return shared_ptr<string>(new string(edc->GetLineSegment(y+ra,ca,endOfWindow)));
}

void VerbatimFormatter :: GetCursorPosition(int &row, int &col)
{
  row = y;
  col = x;
}

void VerbatimFormatter :: SetCursorPosition(int row, int col)
{
  y = row;
  x = col;
}

// Cursor Conversion

void VerbatimFormatter :: GridToCursor(int &row, int &col)
{
  row-=ra;
  col-=ca;
}

void VerbatimFormatter :: CursorToGrid(int &row, int &col)
{
  row+=ra;
  col+=ca;
}

// Actions

void VerbatimFormatter :: HandleMoveLeft()
{
  --x;
}

void VerbatimFormatter :: HandleMoveRight()
{
  ++x;
}

void VerbatimFormatter :: HandleMoveUp()
{
  --y;
}

void VerbatimFormatter :: HandleMoveDown()
{
  if (y == rows-2) {
    ++ra;
  } else {
    ++y;
  }
}

// Special Actions

void VerbatimFormatter :: HandlePageUp()
{
  y-=GetMaxHeight();
}

void VerbatimFormatter :: HandlePageDown()
{
  y+=GetMaxHeight();
}

void VerbatimFormatter :: HandleHome()
{
  x = ca = 0;
}

void VerbatimFormatter :: HandleEnd()
{
  x = edc->GetLineLength(y+ra);
}

// Private Methods

void VerbatimFormatter :: AdjustCoordinates()
{
  // rows = 6. What will y be if y == 6 on this call.
  // if (y == 6) { throw string("Y is 6 and rows is " + to_string(rows)); }
  // First we fix y
  if (y < 0 && !ra) {
    y = 0; // We've gone off screen to a point that doesn't exist
  } else if (y < 0) {
    // Goal is for y to equal 0. Then we have to move ra.
    ra += y;
    y = 0;
  }

  int numLines = edc->GetNumLines();
  if (y+ra >= numLines || y > (rows-2)) {
    y = 0;
    ra = 0;
    while (y != rows-2 && y != numLines-1) {
      ++y;
    }
    while (y+ra != numLines-1) {
      ++ra;
    }
  }

  // Second we fix x
  if (x < 0 && !ca) {
    x = 0; // Gone off screen to a point we shouldn't be.
  } else if (x < 0) {
    ca += x;
    x = 0;
  } else if (x >= cols) {
    ca += (x-(cols-1));
    x = cols-1;
  }
  int lineLen = edc->GetLineLength(y+ra);
  while ((x+ca) > lineLen && x > 0) {
    --x;
  }
  while ((x+ca) > lineLen && ca > 0) {
    --ca;
  }
}