/* --IMPORTANT NOTE--
* If any of the following returns a FALSE,
* it means that there is NO NEED to MOVE the display area component
*
* Otherwise DO MOVE it, in the direction of the pointer
*/
public bool MoveUp(TextboxDisplayArea displayArea, List <List <char?> > characterMap)
{
int absX = Anchor.X + displayArea.Anchor.X;
int absY = Anchor.Y + displayArea.Anchor.Y;
if (absY == 0)
{
return(false);
}
else
{
if (absX > characterMap[absY - 1].Count)
{
absX = characterMap[absY - 1].Count;
}
absY--;
}
Anchor.X = absX - displayArea.Anchor.X;
Anchor.Y = absY - displayArea.Anchor.Y;
if (Anchor.X < displayArea.Width && Anchor.Y < displayArea.Height)
{
return(false);
}
else
{
return(true);
}
}
public bool MoveRight(TextboxDisplayArea displayArea, List <List <char?> > characterMap)
{
int absX = Anchor.X + displayArea.Anchor.X;
int absY = Anchor.Y + displayArea.Anchor.Y;
if (absX == characterMap[absY].Count)
{
if (absY == characterMap.Count - 1)
{
return(false);
}
else
{
absX = 0;
absY++;
}
}
else
{
absX++;
}
Anchor.X = absX - displayArea.Anchor.X;
Anchor.Y = absY - displayArea.Anchor.Y;
if (Anchor.X < displayArea.Width && Anchor.Y < displayArea.Height)
{
return(false);
}
else
{
return(true);
}
}
public char ParseAndExecute(ConsoleKeyInfo keyPressed,
TextboxDisplayArea parentComponent, ref List <List <char?> > characterMap)
{
switch (keyPressed.Key)
{
/*
* If pointer succeed in moving in whatever direction, it gives no feedback
* If fail, then pass out the reason
* "w" for up; "s" for down; "a" for left; "d" for right; "n" for "NO CHANGE"
* "0" for not using the key
*/
case ConsoleKey.UpArrow:
if (MoveUp(parentComponent, characterMap))
{
return('w');
}
break;
case ConsoleKey.DownArrow:
if (MoveDown(parentComponent, characterMap))
{
return('s');
}
break;
case ConsoleKey.LeftArrow:
if (MoveLeft(parentComponent, characterMap))
{
return('a');
}
break;
case ConsoleKey.RightArrow:
if (MoveRight(parentComponent, characterMap))
{
return('d');
}
break;
default:
return('0');
}
return('n');
}
