97732 Context help model, actions and reducer

src/app/shared/context-help.reducer.ts

@@ -0,0 +1,47 @@
+import { ContextHelpModel } from './context-help.model';
+import { ContextHelpAction, ContextHelpActionTypes } from './context-help.actions';
+
+export type ContextHelpModels = {
+  [id: string]: ContextHelpModel;
+};
+
+export interface ContextHelpState {
+  allIconsVisible: boolean;
+  models: ContextHelpModels;
+}
+
+export function contextHelpReducer(state: ContextHelpState, action: ContextHelpAction): ContextHelpState {
+  switch (action.type) {
+    case ContextHelpActionTypes.CONTEXT_HELP_TOGGLE_ICONS: {
+      return {...state, allIconsVisible: true};
+    }
+    case ContextHelpActionTypes.CONTEXT_HELP_ADD: {
+      const newModels = {...state.models, [action.model.id]: action.model};
+      return {...state, models: newModels};
+    }
+    case ContextHelpActionTypes.CONTEXT_HELP_REMOVE: {
+      const {[action.id]: _, ...remainingModels} = state.models;
+      return {...state, models: remainingModels};
+    }
+    case ContextHelpActionTypes.CONTEXT_HELP_TOGGLE_TOOLTIP: {
+      return modifyTooltipVisibility(state, action.id, v => !v);
+    }
+    case ContextHelpActionTypes.CONTEXT_HELP_SHOW_TOOLTIP: {
+      return modifyTooltipVisibility(state, action.id, _ => true);
+    }
+    case ContextHelpActionTypes.CONTEXT_HELP_HIDE_TOOLTIP: {
+      return modifyTooltipVisibility(state, action.id, _ => false);
+    }
+    default: {
+      return state;
+    }
+  }
+}
+
+function modifyTooltipVisibility(state: ContextHelpState, id: string, modify: (vis: boolean) => boolean)
+  : ContextHelpState {
+  const {[id]: matchingModel, ...otherModels} = state.models;
+  const modifiedModel = {...matchingModel, tooltipVisible: modify(matchingModel.tooltipVisible)};
+  const newModels = {...otherModels, [id]: modifiedModel};
+  return {...state, models: newModels};
+}