b20

StandaloneInputModule.cs

using System.Collections.Generic;
using System.Reflection;

namespace UnityEngine.EventSystems
{
	[AddComponentMenu("Event/Standalone Input Module")]
	public class StandaloneInputModule : PointerInputModule
	{
		private float m_NextAction;

		private InputMode m_CurrentInputMode = InputMode.Buttons;

		private Vector2 m_LastMousePosition;
		private Vector2 m_MousePosition;

		protected StandaloneInputModule()
		{}

		public enum InputMode
		{
			Mouse,
			Buttons
		}

		public InputMode inputMode
		{
			get { return m_CurrentInputMode; }
		}

		[SerializeField]
		private string m_HorizontalAxis = "Horizontal";

		/// <summary>
		/// Name of the vertical axis for movement (if axis events are used).
		/// </summary>
		[SerializeField]
		private string m_VerticalAxis = "Vertical";

		/// <summary>
		/// Name of the submit button.
		/// </summary>
		[SerializeField]
		private string m_SubmitButton = "Submit";

		/// <summary>
		/// Name of the submit button.
		/// </summary>
		[SerializeField]
		private string m_CancelButton = "Cancel";

		[SerializeField]
		private float m_InputActionsPerSecond = 10;

		[SerializeField]
		private bool m_AllowActivationOnMobileDevice;

		public bool allowActivationOnMobileDevice
		{
			get { return m_AllowActivationOnMobileDevice; }
			set { m_AllowActivationOnMobileDevice = value; }
		}

		public float inputActionsPerSecond
		{
			get { return m_InputActionsPerSecond; }
			set { m_InputActionsPerSecond = value; }
		}

		/// <summary>
		/// Name of the horizontal axis for movement (if axis events are used).
		/// </summary>
		public string horizontalAxis
		{
			get { return m_HorizontalAxis; }
			set { m_HorizontalAxis = value; }
		}

		/// <summary>
		/// Name of the vertical axis for movement (if axis events are used).
		/// </summary>
		public string verticalAxis
		{
			get { return m_VerticalAxis; }
			set { m_VerticalAxis = value; }
		}

		public string submitButton
		{
			get { return m_SubmitButton; }
			set { m_SubmitButton = value; }
		}

		public string cancelButton
		{
			get { return m_CancelButton; }
			set { m_CancelButton = value; }
		}

		public override void UpdateModule()
		{
			m_LastMousePosition = m_MousePosition;
			m_MousePosition = Input.mousePosition;
		}

		public override bool IsModuleSupported()
		{
			return m_AllowActivationOnMobileDevice || !Application.isMobilePlatform;
		}

		public override bool ShouldActivateModule()
		{
			if (!base.ShouldActivateModule ())
				return false;

			var shouldActivate = Input.GetButtonDown (m_SubmitButton);
			shouldActivate |= Input.GetButtonDown (m_CancelButton);
			shouldActivate |= !Mathf.Approximately (Input.GetAxisRaw (m_HorizontalAxis), 0.0f);
			shouldActivate |= !Mathf.Approximately (Input.GetAxisRaw (m_VerticalAxis), 0.0f);
			shouldActivate |= (m_MousePosition - m_LastMousePosition).sqrMagnitude > 0.0f;
			shouldActivate |= Input.GetMouseButtonDown (0);
			return shouldActivate;
		}

		public override void ActivateModule()
		{
			base.ActivateModule ();
			m_MousePosition = Input.mousePosition;
			m_LastMousePosition = Input.mousePosition;

			var toSelect = eventSystem.currentSelectedGameObject;
			if (toSelect == null)
				toSelect = eventSystem.lastSelectedGameObject;
			if (toSelect == null)
				toSelect = eventSystem.firstSelectedGameObject;

			eventSystem.SetSelectedGameObject (null, GetBaseEventData ());
			eventSystem.SetSelectedGameObject (toSelect, GetBaseEventData ());
		}

		public override void DeactivateModule()
		{
			base.DeactivateModule ();
			ClearSelection ();
		}

		public override void Process()
		{
			bool usedEvent = SendUpdateEventToSelectedObject ();

			if (eventSystem.sendNavigationEvents)
			{
				if (!usedEvent)
					usedEvent |= SendMoveEventToSelectedObject ();

				if (!usedEvent)
					SendSubmitEventToSelectedObject ();
			}

			ProcessMouseEvent ();
		} 

		/// <summary>
		/// Process submit keys.
		/// </summary>
		private bool SendSubmitEventToSelectedObject()
		{
			if (eventSystem.currentSelectedGameObject == null || m_CurrentInputMode != InputMode.Buttons)
				return false;

			var data = GetBaseEventData ();
			if (Input.GetButtonDown (m_SubmitButton))
				ExecuteEvents.Execute (eventSystem.currentSelectedGameObject, data, ExecuteEvents.submitHandler);

			if (Input.GetButtonDown (m_CancelButton))
				ExecuteEvents.Execute (eventSystem.currentSelectedGameObject, data, ExecuteEvents.cancelHandler);
			return data.used;
		}

		private bool AllowMoveEventProcessing(float time)
		{
			bool allow = Input.GetButtonDown (m_HorizontalAxis);
			allow |= Input.GetButtonDown (m_VerticalAxis);
			allow |= (time > m_NextAction);
			return allow;
		}

		private Vector2 GetRawMoveVector()
		{
			Vector2 move = Vector2.zero;
			move.x = Input.GetAxisRaw (m_HorizontalAxis);
			move.y = Input.GetAxisRaw (m_VerticalAxis);

			if (Input.GetButtonDown (m_HorizontalAxis))
			{
				if (move.x < 0)
					move.x = -1f;
				if (move.x > 0)
					move.x = 1f;
			}
			if (Input.GetButtonDown (m_VerticalAxis))
			{
				if (move.y < 0)
					move.y = -1f;
				if (move.y > 0)
					move.y = 1f;
			}
			return move;
		}

		/// <summary>
		/// Process keyboard events.
		/// </summary>
		private bool SendMoveEventToSelectedObject()
		{
			float time = Time.unscaledTime;

			if (!AllowMoveEventProcessing (time))
				return false;

			Vector2 movement = GetRawMoveVector ();
			//Debug.Log(m_ProcessingEvent.rawType + " axis:" + m_AllowAxisEvents + " value:" + "(" + x + "," + y + ")");
			var axisEventData = GetAxisEventData (movement.x, movement.y, 0.6f);
			if (!Mathf.Approximately (axisEventData.moveVector.x, 0f)
				|| !Mathf.Approximately (axisEventData.moveVector.y, 0f))
			{
				if (m_CurrentInputMode != InputMode.Buttons)
				{
					// so if we are chaning to keyboard
					m_CurrentInputMode = InputMode.Buttons;

					// if we are doing a 'fresh selection'
					// return as we don't want to do a move.
					if (ResetSelection ())
					{
						m_NextAction = time + 1f / m_InputActionsPerSecond;
						return true;
					}
				}
				ExecuteEvents.Execute (eventSystem.currentSelectedGameObject, axisEventData, ExecuteEvents.moveHandler);
			}
			m_NextAction = time + 1f / m_InputActionsPerSecond;
			return axisEventData.used;
		}

		private bool ResetSelection()
		{
			var baseEventData = GetBaseEventData ();
			// clear all selection
			// & figure out what the mouse is over
			var lastMousePointer = GetLastPointerEventData (kMouseLeftId);
			var hoveredObject = lastMousePointer == null ? null : lastMousePointer.pointerEnter;
			HandlePointerExitAndEnter (lastMousePointer, null);
			eventSystem.SetSelectedGameObject (null, baseEventData);

			// if we were hovering something... 
			// use this as the basis for the selection
			bool resetSelection = false;
			GameObject toSelect = ExecuteEvents.GetEventHandler<ISelectHandler> (hoveredObject);
			if (toSelect == null)
			{
				// if there was no hover
				// then use the last selected
				toSelect = eventSystem.lastSelectedGameObject;
				resetSelection = true;
			}

			eventSystem.SetSelectedGameObject (toSelect, baseEventData);
			return resetSelection;
		}

		/// <summary>
		/// Process all mouse events.
		/// </summary>
		private void ProcessMouseEvent()
		{
			var mouseData = GetMousePointerEventData ();

			var pressed = mouseData.AnyPressesThisFrame ();
			var released = mouseData.AnyReleasesThisFrame ();

			var leftButtonData = mouseData[PointerEventData.InputButton.Left];

			if (!UseMouse (pressed, released, leftButtonData.buttonData))
				return;

			// Process the first mouse button fully
			ProcessMousePress (leftButtonData);
			ProcessMove (leftButtonData.buttonData);
			ProcessDrag (leftButtonData.buttonData);

			// Now process right / middle clicks
			ProcessMousePress (mouseData[PointerEventData.InputButton.Right]);
			ProcessDrag(mouseData[PointerEventData.InputButton.Right].buttonData);
			ProcessMousePress(mouseData[PointerEventData.InputButton.Middle]);
			ProcessDrag(mouseData[PointerEventData.InputButton.Middle].buttonData);

			if (!Mathf.Approximately (leftButtonData.buttonData.scrollDelta.sqrMagnitude, 0.0f))
			{
				var scrollHandler = ExecuteEvents.GetEventHandler<IScrollHandler> (leftButtonData.buttonData.pointerCurrentRaycast.go);
				ExecuteEvents.ExecuteHierarchy (scrollHandler, leftButtonData.buttonData, ExecuteEvents.scrollHandler);
			}
		}

		private bool UseMouse(bool pressed, bool released, PointerEventData pointerData)
		{
			if (m_CurrentInputMode == InputMode.Mouse)
				return true;

			// On mouse action switch back to mouse control scheme
			if (pressed || released || pointerData.IsPointerMoving () || pointerData.IsScrolling ())
			{
				m_CurrentInputMode = InputMode.Mouse;
				eventSystem.SetSelectedGameObject (null);
			}

			return m_CurrentInputMode == InputMode.Mouse;
		}

		private bool SendUpdateEventToSelectedObject()
		{
			if (eventSystem.currentSelectedGameObject == null)
				return false;

			var data = GetBaseEventData ();
			ExecuteEvents.Execute (eventSystem.currentSelectedGameObject, data, ExecuteEvents.updateSelectedHandler);
			return data.used;
		}

		/// <summary>
		/// Process the current mouse press.
		/// </summary>
		private void ProcessMousePress(MouseButtonEventData data)
		{
			var pointerEvent = data.buttonData;
			var currentOverGo = pointerEvent.pointerCurrentRaycast.go;

			// PointerDown notification
			if (data.PressedThisFrame ())
			{
				pointerEvent.eligibleForClick = true;
				pointerEvent.delta = Vector2.zero;
				pointerEvent.dragging = false;
				pointerEvent.pressPosition = pointerEvent.position;
				pointerEvent.pointerPressRaycast = pointerEvent.pointerCurrentRaycast;

				// search for the control that will receive the press
				// if we can't find a press handler set the press 
				// handler to be what would receive a click.
				var newPressed = ExecuteEvents.ExecuteHierarchy (currentOverGo, pointerEvent, ExecuteEvents.pointerDownHandler);

				// didnt find a press handler... search for a click handler
				if (newPressed == null)
					newPressed = ExecuteEvents.GetEventHandler<IPointerClickHandler> (currentOverGo);

				//Debug.Log("Pressed: " + newPressed);

				float time = Time.unscaledTime;

				if (newPressed == pointerEvent.lastPress)
				{
					var diffTime = time - pointerEvent.clickTime;
					if ( diffTime < 0.3f)
						++pointerEvent.clickCount;
					else
						pointerEvent.clickCount = 1;

					pointerEvent.clickTime = time;
				}
				else
				{
					pointerEvent.clickCount = 1;
				}

				pointerEvent.pointerPress = newPressed;
				pointerEvent.rawPointerPress = currentOverGo;

				pointerEvent.clickTime = time;

				// Save the drag handler as well
				pointerEvent.pointerDrag = ExecuteEvents.GetEventHandler<IDragHandler> (currentOverGo);

				if (pointerEvent.pointerDrag != null)
					ExecuteEvents.Execute (pointerEvent.pointerDrag, pointerEvent, ExecuteEvents.populateDragThreshold);

				//	Debug.Log("Setting Drag Handler to: " + pointer.pointerDrag);

				// Selection tracking
				var selectHandlerGO = ExecuteEvents.GetEventHandler<ISelectHandler> (currentOverGo);
				eventSystem.SetSelectedGameObject (selectHandlerGO, pointerEvent);
			}

			// PointerUp notification
			if (data.ReleasedThisFrame ())
			{
				//Debug.Log("Executing pressup on: " + pointer.pointerPress);
				ExecuteEvents.Execute (pointerEvent.pointerPress, pointerEvent, ExecuteEvents.pointerUpHandler);

				//Debug.Log("KeyCode: " + pointer.eventData.keyCode);

				// see if we mouse up on the same element that we clicked on...
				var pointerUpHandler = ExecuteEvents.GetEventHandler<IPointerClickHandler> (currentOverGo);

				// PointerClick and Drop events
				if (pointerEvent.pointerPress == pointerUpHandler && pointerEvent.eligibleForClick)
				{
					ExecuteEvents.Execute (pointerEvent.pointerPress, pointerEvent, ExecuteEvents.pointerClickHandler);
				}
				else if (pointerEvent.pointerDrag != null)
				{
					ExecuteEvents.ExecuteHierarchy (currentOverGo, pointerEvent, ExecuteEvents.dropHandler);
				}

				pointerEvent.eligibleForClick = false;
				pointerEvent.pointerPress = null;
				pointerEvent.rawPointerPress = null;
				pointerEvent.dragging = false;

				if (pointerEvent.pointerDrag != null)
					ExecuteEvents.Execute (pointerEvent.pointerDrag, pointerEvent, ExecuteEvents.endDragHandler);

				pointerEvent.pointerDrag = null;

				// redo pointer enter / exit to refresh state
				// so that if we moused over somethign that ignored it before
				// due to having pressed on something else
				// it now gets it.
				if (currentOverGo != pointerEvent.pointerEnter)
				{
					HandlePointerExitAndEnter (pointerEvent, null);
					HandlePointerExitAndEnter (pointerEvent, currentOverGo);
				}
			}
		}
	}
}

This needs to be updated. There were some significant changes between beta 18-19 and RC2.

This doesn't compile anymore. A bunch of errors with mouseData being used as an array when it's not. Where's the latest source code?

Okay, this page has been abandoned. Here's the link to the new one: https://bitbucket.org/Unity-Technologies/ui/src/cdf7fd2113e1566356d8e3fdcc196221dc291253/UnityEngine.UI/EventSystem/InputModules/StandaloneInputModule.cs?at=4.6