PerformanceMeasuring.GameDebugTools.DebugCommandUI.ProcessKeyInputs C# (CSharp) Method

        public void ProcessKeyInputs(float dt)
        {
            KeyboardState keyState = Keyboard.GetState();
            Keys[] keys = keyState.GetPressedKeys();

            bool shift = keyState.IsKeyDown(Keys.LeftShift) ||
                            keyState.IsKeyDown(Keys.RightShift);

            foreach (Keys key in keys)
            {
                if (!IsKeyPressed(key, dt)) continue;

                char ch;
                if (KeyboardUtils.KeyToString(key, shift, out ch))
                {
                    // Handle typical character input.
                    commandLine = commandLine.Insert(cursorIndex, new string(ch, 1));
                    cursorIndex++;
                }
                else
                {
                    switch (key)
                    {
                        case Keys.Back:
                            if (cursorIndex > 0)
                                commandLine = commandLine.Remove(--cursorIndex, 1);
                            break;
                        case Keys.Delete:
                            if (cursorIndex < commandLine.Length)
                                commandLine = commandLine.Remove(cursorIndex, 1);
                            break;
                        case Keys.Left:
                            if (cursorIndex > 0)
                                cursorIndex--;
                            break;
                        case Keys.Right:
                            if (cursorIndex < commandLine.Length)
                                cursorIndex++;
                            break;
                        case Keys.Enter:
                            // Run the command.
                            ExecuteCommand(commandLine);
                            commandLine = string.Empty;
                            cursorIndex = 0;
                            break;
                        case Keys.Up:
                            // Show command history.
                            if (commandHistory.Count > 0)
                            {
                                commandHistoryIndex =
                                    Math.Max(0, commandHistoryIndex - 1);

                                commandLine = commandHistory[commandHistoryIndex];
                                cursorIndex = commandLine.Length;
                            }
                            break;
                        case Keys.Down:
                            // Show command history.
                            if (commandHistory.Count > 0)
                            {
                                commandHistoryIndex = Math.Min(commandHistory.Count - 1,
                                                                commandHistoryIndex + 1);
                                commandLine = commandHistory[commandHistoryIndex];
                                cursorIndex = commandLine.Length;
                            }
                            break;
                        case Keys.Tab:
                            Hide();
                            break;
                    }
                }
            }

        }