/// <summary>
/// Draw the on-screen selection, knobs, and handle all interaction logic.
/// </summary>
public void OnSceneGUI()
{
if (!EditorPrefs.GetBool("New GUI", true))
{
return;
}
if (Tools.current != Tool.View)
{
return;
}
mWidget = target as NGUIWidget;
Handles.color = mOutlineColor;
Transform t = mWidget.cachedTransform;
Event e = Event.current;
int id = GUIUtility.GetControlID(s_Hash, FocusType.Passive);
EventType type = e.GetTypeForControl(id);
Vector3[] corners = NGUIMath.CalculateWidgetCorners(mWidget);
Handles.DrawLine(corners[0], corners[1]);
Handles.DrawLine(corners[1], corners[2]);
Handles.DrawLine(corners[2], corners[3]);
Handles.DrawLine(corners[0], corners[3]);
Vector3[] worldPos = new Vector3[8];
worldPos[0] = corners[0];
worldPos[1] = corners[1];
worldPos[2] = corners[2];
worldPos[3] = corners[3];
worldPos[4] = (corners[0] + corners[1]) * 0.5f;
worldPos[5] = (corners[1] + corners[2]) * 0.5f;
worldPos[6] = (corners[2] + corners[3]) * 0.5f;
worldPos[7] = (corners[0] + corners[3]) * 0.5f;
Vector2[] screenPos = new Vector2[8];
for (int i = 0; i < 8; ++i)
{
screenPos[i] = HandleUtility.WorldToGUIPoint(worldPos[i]);
}
Bounds b = new Bounds(screenPos[0], Vector3.zero);
for (int i = 1; i < 8; ++i)
{
b.Encapsulate(screenPos[i]);
}
// Time to figure out what kind of action is underneath the mouse
Action actionUnderMouse = mAction;
NGUIWidget.Pivot pivotUnderMouse = NGUIWidget.Pivot.Center;
if (actionUnderMouse == Action.None)
{
int index = 0;
float dist = GetScreenDistance(worldPos, e.mousePosition, out index);
if (dist < 10f)
{
pivotUnderMouse = mPivots[index];
actionUnderMouse = Action.Scale;
}
else if (e.modifiers == 0 && NGUIEditorTools.DistanceToRectangle(corners, e.mousePosition) == 0f)
{
actionUnderMouse = Action.Move;
}
else if (dist < 30f)
{
actionUnderMouse = Action.Rotate;
}
}
// Change the mouse cursor to a more appropriate one
#if !UNITY_3_5
{
Vector2 min = b.min;
Vector2 max = b.max;
min.x -= 30f;
max.x += 30f;
min.y -= 30f;
max.y += 30f;
Rect rect = new Rect(min.x, min.y, max.x - min.x, max.y - min.y);
if (actionUnderMouse == Action.Rotate)
{
SetCursorRect(rect, MouseCursor.RotateArrow);
}
else if (actionUnderMouse == Action.Move)
{
SetCursorRect(rect, MouseCursor.MoveArrow);
}
else if (actionUnderMouse == Action.Scale)
{
SetCursorRect(rect, MouseCursor.ScaleArrow);
}
else
{
SetCursorRect(rect, MouseCursor.Arrow);
}
}
#endif
switch (type)
{
case EventType.Repaint:
{
Handles.BeginGUI();
{
for (int i = 0; i < 8; ++i)
{
DrawKnob(worldPos[i], mWidget.pivot == mPivots[i], id);
}
}
Handles.EndGUI();
}
break;
case EventType.MouseDown:
{
mStartMouse = e.mousePosition;
mAllowSelection = true;
if (e.button == 1)
{
if (e.modifiers == 0)
{
GUIUtility.hotControl = GUIUtility.keyboardControl = id;
e.Use();
}
}
else if (e.button == 0 && actionUnderMouse != Action.None && Raycast(corners, out mStartDrag))
{
mStartPos = t.position;
mStartRot = t.localRotation.eulerAngles;
mStartDir = mStartDrag - t.position;
mStartScale = t.localScale;
mDragPivot = pivotUnderMouse;
mActionUnderMouse = actionUnderMouse;
GUIUtility.hotControl = GUIUtility.keyboardControl = id;
e.Use();
}
}
break;
case EventType.MouseDrag:
{
// Prevent selection once the drag operation begins
bool dragStarted = (e.mousePosition - mStartMouse).magnitude > 3f;
if (dragStarted)
{
mAllowSelection = false;
}
if (GUIUtility.hotControl == id)
{
e.Use();
if (mAction != Action.None || mActionUnderMouse != Action.None)
{
Vector3 pos;
if (Raycast(corners, out pos))
{
if (mAction == Action.None && mActionUnderMouse != Action.None)
{
// Wait until the mouse moves by more than a few pixels
if (dragStarted)
{
if (mActionUnderMouse == Action.Move)
{
mStartPos = t.position;
NGUIEditorTools.RegisterUndo("Move widget", t);
}
else if (mActionUnderMouse == Action.Rotate)
{
mStartRot = t.localRotation.eulerAngles;
mStartDir = mStartDrag - t.position;
NGUIEditorTools.RegisterUndo("Rotate widget", t);
}
else if (mActionUnderMouse == Action.Scale)
{
mStartPos = t.localPosition;
mStartScale = t.localScale;
mDragPivot = pivotUnderMouse;
NGUIEditorTools.RegisterUndo("Scale widget", t);
}
mAction = actionUnderMouse;
}
}
if (mAction != Action.None)
{
if (mAction == Action.Move)
{
t.position = mStartPos + (pos - mStartDrag);
pos = t.localPosition;
pos.x = Mathf.RoundToInt(pos.x);
pos.y = Mathf.RoundToInt(pos.y);
t.localPosition = pos;
}
else if (mAction == Action.Rotate)
{
Vector3 dir = pos - t.position;
float angle = Vector3.Angle(mStartDir, dir);
if (angle > 0f)
{
float dot = Vector3.Dot(Vector3.Cross(mStartDir, dir), t.forward);
if (dot < 0f)
{
angle = -angle;
}
angle = mStartRot.z + angle;
if (e.modifiers != EventModifiers.Shift)
{
angle = Mathf.Round(angle / 15f) * 15f;
}
else
{
angle = Mathf.Round(angle);
}
t.localRotation = Quaternion.Euler(mStartRot.x, mStartRot.y, angle);
}
}
else if (mAction == Action.Scale)
{
// World-space delta since the drag started
Vector3 delta = pos - mStartDrag;
// Adjust the widget's position and scale based on the delta, restricted by the pivot
AdjustPosAndScale(mWidget, mStartPos, mStartScale, delta, mDragPivot);
}
}
}
}
}
}
break;
case EventType.MouseUp:
{
if (GUIUtility.hotControl == id)
{
GUIUtility.hotControl = 0;
GUIUtility.keyboardControl = 0;
if (e.button < 2)
{
bool handled = false;
if (e.button == 1)
{
// Right-click: Select the widget below
NGUIWidget last = null;
NGUIWidget[] widgets = Raycast(mWidget, e.mousePosition);
for (int i = widgets.Length; i > 0;)
{
NGUIWidget w = widgets[--i];
if (w == mWidget)
{
break;
}
last = w;
}
if (last != null)
{
Selection.activeGameObject = last.gameObject;
handled = true;
}
}
else if (mAction == Action.None)
{
if (mAllowSelection)
{
// Left-click: Select the widget above
NGUIWidget last = null;
NGUIWidget[] widgets = Raycast(mWidget, e.mousePosition);
if (widgets.Length > 0)
{
for (int i = 0; i < widgets.Length; ++i)
{
NGUIWidget w = widgets[i];
if (w == mWidget)
{
if (last != null)
{
Selection.activeGameObject = last.gameObject;
}
handled = true;
break;
}
last = w;
}
if (!handled)
{
Selection.activeGameObject = widgets[0].gameObject;
handled = true;
}
}
}
}
else
{
// Finished dragging something
mAction = Action.None;
mActionUnderMouse = Action.None;
Vector3 pos = t.localPosition;
Vector3 scale = t.localScale;
if (mWidget.pixelPerfectAfterResize)
{
t.localPosition = pos;
t.localScale = scale;
mWidget.MakePixelPerfect();
}
else
{
pos.x = Mathf.Round(pos.x);
pos.y = Mathf.Round(pos.y);
scale.x = Mathf.Round(scale.x);
scale.y = Mathf.Round(scale.y);
t.localPosition = pos;
t.localScale = scale;
}
handled = true;
}
if (handled)
{
mActionUnderMouse = Action.None;
mAction = Action.None;
e.Use();
}
}
}
else if (mAllowSelection)
{
NGUIWidget[] widgets = Raycast(mWidget, e.mousePosition);
if (widgets.Length > 0)
{
Selection.activeGameObject = widgets[0].gameObject;
}
}
mAllowSelection = true;
}
break;
case EventType.KeyDown:
{
if (e.keyCode == KeyCode.UpArrow)
{
Vector3 pos = t.localPosition;
pos.y += 1f;
t.localPosition = pos;
e.Use();
}
else if (e.keyCode == KeyCode.DownArrow)
{
Vector3 pos = t.localPosition;
pos.y -= 1f;
t.localPosition = pos;
e.Use();
}
else if (e.keyCode == KeyCode.LeftArrow)
{
Vector3 pos = t.localPosition;
pos.x -= 1f;
t.localPosition = pos;
e.Use();
}
else if (e.keyCode == KeyCode.RightArrow)
{
Vector3 pos = t.localPosition;
pos.x += 1f;
t.localPosition = pos;
e.Use();
}
else if (e.keyCode == KeyCode.Escape)
{
if (GUIUtility.hotControl == id)
{
if (mAction != Action.None)
{
if (mAction == Action.Move)
{
t.position = mStartPos;
}
else if (mAction == Action.Rotate)
{
t.localRotation = Quaternion.Euler(mStartRot);
}
else if (mAction == Action.Scale)
{
t.position = mStartPos;
t.localScale = mStartScale;
}
}
GUIUtility.hotControl = 0;
GUIUtility.keyboardControl = 0;
mActionUnderMouse = Action.None;
mAction = Action.None;
e.Use();
}
else
{
Selection.activeGameObject = null;
Tools.current = Tool.Move;
}
}
}
break;
}
}
