/// <summary>
/// Remove an object from the selection and reverts the shader
/// </summary>
/// <param name="go"></param>
/// <param name="invokeSelectionChangeEvent"></param>
protected void RemoveObjectFromSelection(GameObject go, bool invokeSelectionChangeEvent = true)
{
if (selectedObjects.Remove(go))
{
go.GetComponent <Selectable>().RevertShader();
if (invokeSelectionChangeEvent && ChangeSelectionEvent != null)
{
ChangeSelectionEvent.Invoke(Array.AsReadOnly(new GameObject[] { }), Array.AsReadOnly(new GameObject[] { go }), SelectedObjects);
}
}
}
/// <summary>
/// Clears the selection and resets the shaders
/// </summary>
public void ClearSelection()
{
selectedObjects.ForEach(o =>
{
if (o != null)
{
o.GetComponent <Selectable>().RevertShader();
}
});
if (ChangeSelectionEvent != null)
{
ChangeSelectionEvent.Invoke(Array.AsReadOnly(new GameObject[] { }), SelectedObjects, new List <GameObject>().AsReadOnly());
}
selectedObjects.Clear();
}
/// <summary>
/// Adds an object to the selection, changes the shader and shows and hides the appropriate canvas
/// </summary>
/// <param name="go">The Gameobject which is added</param>
protected void AddObjectToSelection(GameObject go, bool invokeSelectionChangeEvent = true)
{
if (selectedObjects.Contains(go))
{
return;
}
if (go == null)
{
return;
}
Selectable selectable = go.GetComponent <Selectable>();
if (selectable == null)
{
throw new Exception("You tried to Add an GameObject which hans't a Selectable component on it: (Gameobject: " + go + ")");
}
selectable.SetShader();
selectedObjects.Add(go);
if (selectedObjects.Count == 1)
{
ShowObjectUi(selectedObjects.First());
}
else if (!eventSystem.IsPointerOverGameObject())
{
HideObjectUi();
}
if (SelectionContainsListeners.ContainsKey(go))
{
foreach (var l in SelectionContainsListeners[go])
{
l.Invoke(go, selectedObjects.AsReadOnly());
}
}
if (invokeSelectionChangeEvent && ChangeSelectionEvent != null)
{
ChangeSelectionEvent.Invoke(Array.AsReadOnly(new GameObject[] { go }), Array.AsReadOnly(new GameObject[] {}), SelectedObjects);
}
}
void Update()
{
bool mousePressed = Input.GetButton("LeftMouse") || Input.GetButton("RightMouse");
bool mouseDown = Input.GetButtonDown("LeftMouse") || Input.GetButtonDown("RightMouse");
bool mouseUp = Input.GetButtonUp("LeftMouse") || Input.GetButtonUp("RightMouse");
bool leftMouse = Input.GetButton("LeftMouse") || Input.GetButtonDown("LeftMouse") || Input.GetButtonUp("LeftMouse");
//switches between the modes depending on the controll key
if (SelectionMode != SelectionModeEnum.MultipleAdd && Input.GetButton("Control"))
{
SelectionMode = SelectionModeEnum.MultipleAdd;
}
if (SelectionMode == SelectionModeEnum.MultipleAdd && !Input.GetButton("Control"))
{
SelectionMode = SelectionModeEnum.MultipleClear;
}
//Clears the selection if the selection mode isn't addative
if (mouseDown && SelectionMode != SelectionModeEnum.MultipleAdd && leftMouse)
{
ClearSelection();
ClearSecundarySelection();
}
else if (mouseDown && SelectionMode != SelectionModeEnum.MultipleAdd && !leftMouse)
{
ClearSecundarySelection();
}
//saves the start position of the mouse for the selection box
if (mouseDown && !multipleSelectionActive)
{
selectionStartMousePos = Input.mousePosition;
}
//Checks if the mouse position has changed since the user clicked the LeftMouse Button. If the distance is greater then 0.1 (a threadshold) then multiselecting is activated
if (mousePressed &&
Mathf.Abs(Vector2.Distance(selectionStartMousePos, Input.mousePosition)) > 0.1 && !multipleSelectionActive)
{
multipleSelectionActive = true;
SelectionMode = SelectionModeEnum.MultipleClear; //the default selection mode
}
//Updates the cursor texture
if (SelectionMode == SelectionModeEnum.MultipleAdd)
{
Cursor.SetCursor(cursorAddSelectionTexture, Vector2.zero, CursorMode.Auto);
}
else
{
Cursor.SetCursor(cursorSelectionTexture, Vector2.zero, CursorMode.Auto);
}
//In here is the main multi selection logic
//here is the selecting and the setting of the shader logic
if (multipleSelectionActive && mouseUp)
{
//precalculates the bounds
Bounds viewportBounds = GetViewportBounds(camera, selectionStartMousePos, Input.mousePosition);
var addedGos = new List <GameObject>();
var removedGos = new List <GameObject>();
//goes through every object which can be selected (
foreach (var go in Selectable.SelectGameObjects)
{
if (go == null)
{
continue;
}
if (viewportBounds.Contains(camera.WorldToViewportPoint(go.transform.position)))
{
if (leftMouse)
{
if (selectedObjects.Contains(go))
{
RemoveObjectFromSelection(go, false);
removedGos.Add(go);
}
else
{
AddObjectToSelection(go, false);
addedGos.Add(go);
}
}
else
{
if (SecundarySelectedObjects.Contains(go))
{
RemoveObjectFromSecundarySelection(go, false);
removedGos.Add(go);
}
else
{
AddObjectToSecundarySelection(go, false);
addedGos.Add(go);
}
}
}
}
if (ChangeSelectionEvent != null)
{
if (leftMouse)
{
ChangeSelectionEvent.Invoke(addedGos.AsReadOnly(), removedGos.AsReadOnly(), SelectedObjects);
}
else
{
ChangeSecundarySelectionEvent.Invoke(addedGos.AsReadOnly(), removedGos.AsReadOnly(), SecundarySelectedObjects);
}
}
}
//hides the last ui canvas
if (mouseDown && !eventSystem.IsPointerOverGameObject() && leftMouse)
{
HideObjectUi();
}
//Here is the single selection in
if (mouseUp && !multipleSelectionActive)
{
Ray ray = camera.ScreenPointToRay(Input.mousePosition);
RaycastHit hit;
Debug.DrawRay(ray.origin, ray.direction * 100, Color.blue, 10);
if (Physics.Raycast(ray, out hit, 1000.0f) && !EventSystem.current.IsPointerOverGameObject())
{
GameObject hittedGo = hit.collider.gameObject;
if (hittedGo.GetComponent <Selectable>() != null)
{
if (selectedObjects.Contains(hittedGo))
{
if (leftMouse)
{
RemoveObjectFromSelection(hittedGo);
}
else
{
RemoveObjectFromSecundarySelection(hittedGo);
}
}
else
{
if (leftMouse)
{
AddObjectToSelection(hittedGo);
}
else
{
AddObjectToSecundarySelection(hittedGo);
}
}
}
else
{
if (!leftMouse)
{
selectedPosition = hit.point;
if (ChangePositionEvent != null)
{
ChangePositionEvent.Invoke(selectedPosition);
}
}
}
}
else
{
Debug.LogWarning("Didn't hit terain with raycast!");
}
}
//disables the multiple selection mode
if (mouseUp && multipleSelectionActive)
{
multipleSelectionActive = false;
SelectionMode = SelectionModeEnum.Single;
}
}