private static Vector3 DoDragHandleAxis(DragAxisInfo axisInfo, Vector3 position, ref DragHandleResult result)
{
// Must request a control ID for each interactible control in the GUI that can respond to events
int id = GUIUtility.GetControlID(axisInfo._handleHash, FocusType.Passive);
float handleSize = HandleUtility.GetHandleSize(position);
Camera camera = Camera.current;
Event currentEvent = Event.current;
Vector2 mousePos = HEU_EditorUI.GetMousePosition(ref currentEvent, camera);
Vector3 handlePosition = Handles.matrix.MultiplyPoint(position);
Matrix4x4 cachedHandleMatrix = Handles.matrix;
int mouseButtonID = Event.current.button;
// Process events (using GetTypeForControl to filter events relevant to this control)
switch (currentEvent.GetTypeForControl(id))
{
case EventType.MouseDown:
{
if (HandleUtility.nearestControl == id && (mouseButtonID == 0 || mouseButtonID == 1))
{
GUIUtility.hotControl = id;
axisInfo._dragMouseCurrent = axisInfo._dragMouseStart = mousePos;
axisInfo._dragWorldStart = position;
axisInfo._handleHasMoved = false;
currentEvent.Use();
EditorGUIUtility.SetWantsMouseJumping(1);
if (mouseButtonID == 0)
{
result = DragHandleResult.LMB_PRESS;
}
else if (mouseButtonID == 1)
{
result = DragHandleResult.RMB_PRESS;
}
}
break;
}
case EventType.MouseUp:
{
if (GUIUtility.hotControl == id && (mouseButtonID == 0 || mouseButtonID == 1))
{
GUIUtility.hotControl = 0;
currentEvent.Use();
EditorGUIUtility.SetWantsMouseJumping(0);
if (mouseButtonID == 0)
{
result = DragHandleResult.LMB_RELEASE;
}
else if (mouseButtonID == 1)
{
result = DragHandleResult.RMB_RELEASE;
}
// Double-click
if (mousePos == axisInfo._dragMouseStart)
{
bool doubleClick = (axisInfo._handleClickID == id) && (Time.realtimeSinceStartup - axisInfo._handleClickTime < _handleDoubleClikcInterval);
axisInfo._handleClickID = id;
axisInfo._handleClickTime = Time.realtimeSinceStartup;
if (mouseButtonID == 0)
{
result = doubleClick ? DragHandleResult.LMB_DOUBLECLICK : DragHandleResult.LMB_CLICK;
}
else if (mouseButtonID == 1)
{
result = doubleClick ? DragHandleResult.RMB_DOUBLECLICK : DragHandleResult.RMB_CLICK;
}
}
}
break;
}
case EventType.MouseDrag:
{
if (GUIUtility.hotControl == id)
{
if (axisInfo._dragAxis == DragAxis.ALL_AXIS)
{
// Free movement - (all axis)
// Flip y because Unity is inverted
axisInfo._dragMouseCurrent += new Vector2(currentEvent.delta.x, -currentEvent.delta.y);
Vector3 position2 = camera.WorldToScreenPoint(Handles.matrix.MultiplyPoint(axisInfo._dragWorldStart))
+ (Vector3)(axisInfo._dragMouseCurrent - axisInfo._dragMouseStart);
position = Handles.matrix.inverse.MultiplyPoint(camera.ScreenToWorldPoint(position2));
}
else
{
// Linear movement (constraint to current axis)
// Get the delta between the original handle position and the original mouse down position
// This is used to substract from relative mouse movement to counter the handle jump when dragging
Vector3 originalDragStartSS = HEU_EditorUI.GetHandleWorldToScreenPosition(axisInfo._dragWorldStart, camera);
Vector3 deltaOriginalDragOffset = axisInfo._dragMouseStart - new Vector2(originalDragStartSS.x, originalDragStartSS.y);
Vector3 startPosSS = HEU_EditorUI.GetHandleWorldToScreenPosition(position, camera);
Vector3 constraintSS = HEU_EditorUI.GetHandleWorldToScreenPosition(position + axisInfo._direction, camera) - startPosSS;
Vector3 mousePosV3 = mousePos;
Vector3 relativeMousePos = mousePosV3 - startPosSS - deltaOriginalDragOffset;
float projection = Vector3.Dot(relativeMousePos, constraintSS.normalized);
float normalization = 1 / constraintSS.magnitude;
float scale = projection * normalization;
position += axisInfo._direction * scale;
}
if (mouseButtonID == 0)
{
result = DragHandleResult.LMB_DRAG;
}
else if (mouseButtonID == 1)
{
result = DragHandleResult.RMB_DRAG;
}
axisInfo._handleHasMoved = true;
GUI.changed = true;
currentEvent.Use();
}
break;
}
case EventType.MouseMove:
case EventType.Repaint:
{
Color handleColor = Handles.color;
if ((GUIUtility.hotControl == id && axisInfo._handleHasMoved) || (HandleUtility.nearestControl == id))
{
Handles.color = Color.yellow;
}
else
{
Handles.color = axisInfo._axisColor;
}
Handles.matrix = Matrix4x4.identity;
if (axisInfo._dragAxis == DragAxis.ALL_AXIS)
{
HEU_EditorUI.DrawCubeCap(id, handlePosition, Quaternion.identity, handleSize * 0.25f);
}
else
{
HEU_EditorUI.DrawArrowCap(id, handlePosition, Quaternion.LookRotation(axisInfo._direction), handleSize);
}
Handles.matrix = cachedHandleMatrix;
Handles.color = handleColor;
// This forces a Repaint. We want this when we change the axis color due to being cursor being nearest.
if (currentEvent.type == EventType.MouseMove && HandleUtility.nearestControl == id)
{
SceneView.RepaintAll();
}
break;
}
case EventType.Layout:
{
// AddControl tells Unity where each Handle is relative to the current mouse position
Handles.matrix = Matrix4x4.identity;
if (axisInfo._dragAxis == DragAxis.ALL_AXIS)
{
float distance = handleSize * 0.3f;
HandleUtility.AddControl(id, HandleUtility.DistanceToCircle(handlePosition, distance));
}
else
{
HandleUtility.AddControl(id, HandleUtility.DistanceToLine(handlePosition, handlePosition + axisInfo._direction * handleSize) * 0.4f);
}
Handles.matrix = cachedHandleMatrix;
break;
}
}
return(position);
}