/// <summary>
/// Determine how many rows the prompt should take.
/// </summary>
/// <param name="cols">Current number of columns on the screen.</param>
/// <param name="displayCells">String manipulation helper.</param>
/// <returns></returns>
internal int ComputePromptLines(DisplayCells displayCells, int cols)
{
// split the prompt string into lines
_actualPrompt = StringManipulationHelper.GenerateLines(displayCells, _promptString, cols, cols);
return(_actualPrompt.Count);
}
/// <summary>
/// Write to the output interface.
/// </summary>
private void WriteToScreen()
{
int leftIndentation = _indentationManager.LeftIndentation;
int rightIndentation = _indentationManager.RightIndentation;
int firstLineIndentation = _indentationManager.FirstLineIndentation;
// VALIDITY CHECKS:
// check the useful ("active") width
int usefulWidth = _textColumns - rightIndentation - leftIndentation;
if (usefulWidth <= 0)
{
// fatal error, there is nothing to write to the device
// just clear the buffer and return
_stringBuffer = new StringBuilder();
}
// check indentation or hanging is not larger than the active width
int indentationAbsoluteValue = (firstLineIndentation > 0) ? firstLineIndentation : -firstLineIndentation;
if (indentationAbsoluteValue >= usefulWidth)
{
// valu too big, we reset it to zero
firstLineIndentation = 0;
}
// compute the first line indentation or hanging
int firstLineWidth = _textColumns - rightIndentation - leftIndentation;
int followingLinesWidth = firstLineWidth;
if (firstLineIndentation >= 0)
{
// the first line has an indentation
firstLineWidth -= firstLineIndentation;
}
else
{
// the first line is hanging
followingLinesWidth += firstLineIndentation;
}
// error checking on invalid values
// generate the lines using the computed widths
StringCollection sc = StringManipulationHelper.GenerateLines(_lo.DisplayCells, _stringBuffer.ToString(),
firstLineWidth, followingLinesWidth);
// compute padding
int firstLinePadding = leftIndentation;
int followingLinesPadding = leftIndentation;
if (firstLineIndentation >= 0)
{
// the first line has an indentation
firstLinePadding += firstLineIndentation;
}
else
{
// the first line is hanging
followingLinesPadding -= firstLineIndentation;
}
// now write the lines on the screen
bool firstLine = true;
foreach (string s in sc)
{
if (firstLine)
{
firstLine = false;
_lo.WriteLine(StringManipulationHelper.PadLeft(s, firstLinePadding));
}
else
{
_lo.WriteLine(StringManipulationHelper.PadLeft(s, followingLinesPadding));
}
}
_stringBuffer = new StringBuilder();
}
internal int ComputePromptLines(DisplayCells displayCells, int cols)
{
this.actualPrompt = StringManipulationHelper.GenerateLines(displayCells, this.promptString, cols, cols);
return(this.actualPrompt.Count);
}
