/// <summary>
/// Responds to user input, changing the selected entry and accepting
/// or cancelling the menu.
/// </summary>
public override void HandleInput(InputHelper input, GameTime gameTime)
{
// Mouse or touch on a menu item
int hoverIndex = GetMenuEntryAt(input.Cursor);
if (hoverIndex > -1 && _menuEntries[hoverIndex].IsSelectable() && !_scrollLock)
{
_selectedEntry = hoverIndex;
}
else
{
_selectedEntry = -1;
}
_scrollSlider.Hover = false;
if (input.IsCursorValid)
{
_scrollUp.Collide(input.Cursor);
_scrollDown.Collide(input.Cursor);
_scrollSlider.Collide(input.Cursor);
}
else
{
_scrollUp.Hover = false;
_scrollDown.Hover = false;
_scrollLock = false;
}
// Accept or cancel the menu?
if (input.IsMenuSelect() && _selectedEntry != -1)
{
if (_menuEntries[_selectedEntry].IsExitItem())
{
ScreenManager.Game.Exit();
}
else if (_menuEntries[_selectedEntry].Screen != null)
{
ScreenManager.AddScreen(_menuEntries[_selectedEntry].Screen);
if (_menuEntries[_selectedEntry].Screen is IDemoScreen)
{
ScreenManager.AddScreen(
new MessageBoxScreen((_menuEntries[_selectedEntry].Screen as IDemoScreen).GetDetails()));
}
}
}
else if (input.IsMenuCancel())
{
ScreenManager.Game.Exit();
}
if (input.IsMenuPressed())
{
if (_scrollUp.Hover)
{
_menuOffset = Math.Max(_menuOffset - 200f * (float)gameTime.ElapsedGameTime.TotalSeconds, 0f);
_scrollLock = false;
}
if (_scrollDown.Hover)
{
_menuOffset = Math.Min(_menuOffset + 200f * (float)gameTime.ElapsedGameTime.TotalSeconds, _maxOffset);
_scrollLock = false;
}
if (_scrollSlider.Hover)
{
_scrollLock = true;
}
}
if (input.IsMenuReleased())
{
_scrollLock = false;
}
if (_scrollLock)
{
_scrollSlider.Hover = true;
_menuOffset = Math.Max(Math.Min(((input.Cursor.Y - _menuBorderTop) / (_menuBorderBottom - _menuBorderTop)) * _maxOffset, _maxOffset), 0f);
}
}