public static HistoricalCourseEditorState UpdateProp(this HistoricalCourseEditorState state, EditorProp prop)
{
if (state.Props.ContainsKey(prop.Id))
{
return(state.Update(state.SelectedProp, state.Props.SetItem(prop.Id, prop), state.PropOrder));
}
else
{
return(state);
}
}
public static HistoricalCourseEditorState AddProp(this HistoricalCourseEditorState state, ImmutableTransform transform)
{
var propId = PropId.CreateRandomId();
var newProp = new EditorProp {
Id = propId, PropType = state.SelectedPropType, Transform = transform
};
// Immediately select the newly created prop
var selectedProp = Maybe.Just(propId);
return(state.Update(selectedProp, state.Props.Add(newProp.Id, newProp), state.PropOrder.Add(propId)));
}
public static HistoricalCourseEditorState SelectPropType(this HistoricalCourseEditorState state, PropType propType)
{
var newProps = ImmutableDictionary <PropId, EditorProp> .Empty;
var newPropOrder = ImmutableList <PropId> .Empty;
var newSelectedProp = Maybe.Nothing <PropId>();
for (int i = 0; i < state.PropOrder.Count; i++)
{
var oldProp = state.Props[state.PropOrder[i]];
var newProp = new EditorProp {
Id = PropId.CreateRandomId(), PropType = propType, Transform = oldProp.Transform
};
newProps = newProps.Add(newProp.Id, newProp);
newPropOrder = newPropOrder.Add(newProp.Id);
if (state.SelectedProp.Equals(Maybe.Just(oldProp.Id)))
{
newSelectedProp = Maybe.Just(newProp.Id);
}
}
return(new HistoricalCourseEditorState(state.Id, propType, newSelectedProp, newProps, newPropOrder,
state.IsUndoPossibe, state.IsRedoPossibe));
}
public static HistoricalCourseEditorState UpdatePropOrder(this HistoricalCourseEditorState state, IImmutableList <PropId> newPropOrder)
{
return(state.Update(state.SelectedProp, state.Props, newPropOrder));
}
public static HistoricalCourseEditorState SelectProp(this HistoricalCourseEditorState state, Maybe <PropId> selectedPropId)
{
return(state.Update(selectedPropId, state.Props, state.PropOrder));
}
public static HistoricalCourseEditorState DeleteProp(this HistoricalCourseEditorState state, PropId id)
{
var selectedProp = state.SelectedProp.Equals(Maybe.Just(id)) ? Maybe.Nothing <PropId>() : state.SelectedProp;
return(state.Update(selectedProp, state.Props.Remove(id), state.PropOrder.Remove(id)));
}
private static HistoricalCourseEditorState Update(this HistoricalCourseEditorState state, Maybe <PropId> selectedPropId,
IImmutableDictionary <PropId, EditorProp> props, IImmutableList <PropId> propOrder)
{
return(new HistoricalCourseEditorState(state.Id, state.SelectedPropType, selectedPropId, props, propOrder,
state.IsUndoPossibe, state.IsRedoPossibe));
}
public static HistoricalCourseEditorState UpdateUndoRedoAvailability(this HistoricalCourseEditorState state, bool isUndoPossible,
bool isRedoPossible)
{
return(new HistoricalCourseEditorState(state.Id, state.SelectedPropType, state.SelectedProp, state.Props, state.PropOrder,
isUndoPossible, isRedoPossible));
}
public CourseEditorState(HistoricalCourseEditorState historicalState, TransientCourseEditorState transientState)
{
_transientState = transientState;
_historicalState = historicalState;
}
