void OnGeneralUI()

in unity/Assets/PostProcessingV2/Editor/Utils/CurveEditor.cs [509:614]
86 lines of code
24 McCabe index (conditional complexity)

        void OnGeneralUI(Rect rect)
        {
            var e = Event.current;

            // Selection
            if (e.type == EventType.MouseDown)
            {
                GUI.FocusControl(null);
                m_SelectedCurve = null;
                m_SelectedKeyframeIndex = -1;
                bool used = false;

                var hit = CanvasToCurve(e.mousePosition);
                float curvePickValue = CurveToCanvas(hit).y;

                // Try and select a curve
                foreach (var curve in m_Curves)
                {
                    if (!curve.Value.editable || !curve.Value.visible)
                        continue;

                    var prop = curve.Key;
                    var state = curve.Value;
                    var animCurve = prop.animationCurveValue;
                    float hitY = animCurve.length == 0
                        ? state.zeroKeyConstantValue
                        : animCurve.Evaluate(hit.x);

                    var curvePos = CurveToCanvas(new Vector3(hit.x, hitY));

                    if (Mathf.Abs(curvePos.y - curvePickValue) < settings.curvePickingDistance)
                    {
                        m_SelectedCurve = prop;

                        if (e.clickCount == 2 && e.button == 0)
                        {
                            // Create a keyframe on double-click on this curve
                            EditCreateKeyframe(animCurve, hit, true, state.zeroKeyConstantValue);
                            SaveCurve(prop, animCurve);
                        }
                        else if (e.button == 1)
                        {
                            // Curve context menu
                            var menu = new GenericMenu();
                            menu.AddItem(new GUIContent("Add Key"), false, (x) =>
                            {
                                var action = (MenuAction)x;
                                var curveValue = action.curve.animationCurveValue;
                                action.curve.serializedObject.Update();
                                EditCreateKeyframe(curveValue, hit, true, 0f);
                                SaveCurve(action.curve, curveValue);
                                action.curve.serializedObject.ApplyModifiedProperties();
                            }, new MenuAction(prop, hit));
                            menu.ShowAsContext();
                            e.Use();
                            used = true;
                        }
                    }
                }

                if (e.clickCount == 2 && e.button == 0 && m_SelectedCurve == null)
                {
                    // Create a keyframe on every curve on double-click
                    foreach (var curve in m_Curves)
                    {
                        if (!curve.Value.editable || !curve.Value.visible)
                            continue;

                        var prop = curve.Key;
                        var state = curve.Value;
                        var animCurve = prop.animationCurveValue;
                        EditCreateKeyframe(animCurve, hit, e.alt, state.zeroKeyConstantValue);
                        SaveCurve(prop, animCurve);
                    }
                }
                else if (!used && e.button == 1)
                {
                    // Global context menu
                    var menu = new GenericMenu();
                    menu.AddItem(new GUIContent("Add Key At Position"), false, () => ContextMenuAddKey(hit, false));
                    menu.AddItem(new GUIContent("Add Key On Curves"), false, () => ContextMenuAddKey(hit, true));
                    menu.ShowAsContext();
                }

                e.Use();
            }

            // Delete selected key(s)
            if (e.type == EventType.KeyDown && (e.keyCode == KeyCode.Delete || e.keyCode == KeyCode.Backspace))
            {
                if (m_SelectedKeyframeIndex != -1 && m_SelectedCurve != null)
                {
                    var animCurve = m_SelectedCurve.animationCurveValue;
                    var length = animCurve.length;

                    if (m_Curves[m_SelectedCurve].minPointCount < length && length >= 0)
                    {
                        EditDeleteKeyframe(animCurve, m_SelectedKeyframeIndex);
                        m_SelectedKeyframeIndex = -1;
                        SaveCurve(m_SelectedCurve, animCurve);
                    }

                    e.Use();
                }
            }
        }