/// <summary>
/// Queries how much space this menu entry requires.
/// </summary>
public virtual int GetHeight(MenuScreen screen)
{
return Fonts.MenuFont.LineSpacing;
}
/// <summary>
/// Updates the menu entry.
/// </summary>
public virtual void Update(MenuScreen screen, bool isSelected,
GameTime gameTime)
{
// When the menu selection changes, entries gradually fade between
// their selected and deselected appearance, rather than instantly
// popping to the new state.
float fadeSpeed = (float)gameTime.ElapsedGameTime.TotalSeconds * 4;
if (isSelected)
selectionFade = Math.Min(selectionFade + fadeSpeed, 1);
else
selectionFade = Math.Max(selectionFade - fadeSpeed, 0);
}
/// <summary>
/// Draws the menu entry. This can be overridden to customize the appearance.
/// </summary>
public virtual void Draw(MenuScreen screen, Vector2 position,
bool isSelected, GameTime gameTime)
{
// If the entry is visible, draw it
if (showMe)
{
float scale = 1;
// If the entry is active, draw the selected entry in yellow, otherwise white.
// If the entry is inactive, draw it in gray.
Color color = isActive ? (isSelected ? Color.Yellow : Color.White) : Color.Gray;
// Modify the alpha to fade text out during transitions.
color = new Color(color.R, color.G, color.B, screen.TransitionAlpha);
// Draw text, centered on the middle of each line.
ScreenManager screenManager = screen.ScreenManager;
SpriteBatch spriteBatch = screenManager.SpriteBatch;
SpriteFont font = Fonts.MenuFont;
Vector2 origin = new Vector2(0, Fonts.MenuFont.LineSpacing / 2);
spriteBatch.DrawString(Fonts.MenuFont, text, position, color, 0,
origin, scale, SpriteEffects.None, 0);
}
}