/// <summary>
/// Shows the menu items for the given MenuHeader.
/// </summary>
/// <param name="header">The MenuHeader to show the menu items of.</param>
private void ShowMenu(MenuHeader header)
{
// Interestingly, it would seem that the width is always calculated using the first item. The
// original AGI games tended to make the item names a consistent length within each menu.
MenuItem firstItem = (header.Items.Count > 0 ? header.Items[0] : null);
int height = header.Height;
int width = (firstItem != null ? firstItem.Name.Length : header.Title.Name.Length);
int column = (firstItem != null ? firstItem.Col : header.Title.Col);
// Compute window size and position and put them into the appropriate bytes of the words.
int menuDim = ((height * CHARHEIGHT + 2 * VMARGIN) << 8) | (width * CHARWIDTH + 2 * HMARGIN);
int menuPos = (((column - 1) * CHARWIDTH) << 8) | ((height + 1) * CHARHEIGHT + VMARGIN - 1);
// Show the menu title as being selected.
Select(header.Title);
// Open a window for this menu using the calculated position and dimensions.
textGraphics.OpenWindow(new TextWindow(menuPos, menuDim, 15, 0));
// Render each of the items in this menu.
foreach (MenuItem item in header.Items)
{
if (item == header.CurrentItem)
{
Select(item);
}
else
{
Deselect(item);
}
}
}