/// <summary>
/// 依据给定的menu style，做菜单绘制前准备
/// </summary>
private void PrepareDrawingContext()
{
switch (Context.Style.DrawingStyle)
{
case MenuDrawingStyle.ClearSreen:
Console.Clear();
break;
case MenuDrawingStyle.InheritStartPoint:
var lastCursor = new CursorStatus();
if (Context.CursorStatus.Left > lastCursor.Left || Context.CursorStatus.Top > lastCursor.Top)
{
throw new Exception("consolemenu 启动环境信息已被破坏");
}
if (lastCursor.Top >= Console.BufferHeight - 1)
{
throw new Exception("console 缓冲区已用尽");
}
else
{
for (int i = Context.CursorStatus.Top; i < lastCursor.Top; i++)
{
Console.MoveBufferArea(0, Console.BufferHeight - 1, Console.BufferWidth, 1, 0, i);
}
Context.SetToConsole();
}
break;
case MenuDrawingStyle.FollowSystem:
break;
default:
throw new NotImplementedException(string.Format("未实现的绘制样式：{0}", Enum.GetName(typeof(MenuDrawingStyle), Context.Style.DrawingStyle)));
}
}
/// <summary>
/// 菜单上下文。父菜单active时生成，用于绘制参考
/// </summary>
/// <param name="menuStyle"></param>
public MenuContext(MenuDrawingStyle drawingStyle, MenuItemKeyStyle keyStyle, ConsoleColor disabledItemForegroundColor = System.ConsoleColor.DarkGray)
{
DrawingStyle = drawingStyle;
KeyStyle = keyStyle;
DisabledItemForegroundColor = disabledItemForegroundColor;
CursorStatus = new CursorStatus();
ConsoleColor = new SafeConsoleColor();
}
/// <summary>
/// 恢复至console
/// </summary>
public void SetToConsole()
{
ConsoleColor.SetToConsole();
CursorStatus.SetToConsole();
}
/// <summary>
/// 菜单上下文。父菜单active时生成，用于绘制参考
/// </summary>
/// <param name="menuStyle"></param>
public MenuContext(MenuStyle menuStyle)
{
Style = menuStyle ?? throw new ArgumentNullException(nameof(menuStyle));
CursorStatus = new CursorStatus();
ConsoleColor = new SafeConsoleColor();
}