internal void SetBackgroundColor(Color backColor, bool setAll = true)
{
/* Set the BackColor property of all the squares to <backColor>.
* We use this method when we want to change the background color of the grid,
* which means that all squares should be set to the same color.
* If setAll is true, we set the background colour for all the squares.
* If it's false, we only set the background colour for squares
* which were not painted. */
// First we set the grid's default background colour to <backColor>
this.DefaultBackgroundColor = backColor;
// Now we set each square's BackColor property to <backColor>
foreach (var squareList in Squares)
{
foreach (Square squareObj in squareList)
{
if (!setAll)
{
// Not all squares should be set.
// This means that we want to set the background colour
// only for squares which were not painted by the user
if (PaintedSquares.ContainsKey(squareObj.Location))
{
// This square is painted. We skip it.
continue;
}
}
else
{
// Remove the square from PaintedSquares because we want a clean grid
if (PaintedSquares.ContainsKey(squareObj.Location))
{
PaintedSquares.Remove(squareObj.Location);
}
}
// Set the background colour the square
squareObj.BackColor = backColor;
}
}
// Redraw the grid
this.Invalidate();
}
private void ShrinkSquares()
{
/* Remove squares from the list of squares */
// First we remove entirely deleted lists.
// This happens when the height was changed.
// We loop backwards from the previous count of squares,
// because it's larger than the new size (either height or width).
for (int y = Squares.Count - 1; y > this.Height / SquareSideLength; y--)
{
// Height is in pixels, so we divide it by SquareSideLength to get the list index.
foreach (Square squareObj in Squares[y])
{
if (PaintedSquares.ContainsKey(squareObj.Location))
{
// A non existent square cannot be painted ;)
PaintedSquares.Remove(squareObj.Location);
}
}
// Now we can remove the entire sublist.
Squares.RemoveAt(y);
}
// Now we remove any extra squares on each sublist.
// This happens when the width was changed.
for (int y = 0; y < Squares.Count; y++)
{
// Once again we loop backwards starting at Count - 1 until we hit the new width.
for (int x = Squares[y].Count - 1; x > this.Width / SquareSideLength; x--)
{
Square squareObj = Squares[y][x];
Squares[y].RemoveAt(x);
if (PaintedSquares.ContainsKey(squareObj.Location))
{
// Remove this square from the PaintedSquares dictionary as well
PaintedSquares.Remove(squareObj.Location);
}
}
}
// Redraw the grid
this.Invalidate();
}
