From 2ac6816317c40bebce23a66bcdd685eafdfe0393 Mon Sep 17 00:00:00 2001
From: Aleksej Komarov <stylemistake@gmail.com>
Date: Sat, 11 Apr 2020 17:30:18 +0300
Subject: [PATCH] Add useGlobal for storing global UI vars in Redux store.

---
 tgui/packages/tgui/interfaces/Uplink.js | 225 +++++++++++-------------
 tgui/packages/tgui/store.js             |  49 ++++++
 2 files changed, 154 insertions(+), 120 deletions(-)

diff --git a/tgui/packages/tgui/interfaces/Uplink.js b/tgui/packages/tgui/interfaces/Uplink.js
index be245dc4d2f..68102af2456 100644
--- a/tgui/packages/tgui/interfaces/Uplink.js
+++ b/tgui/packages/tgui/interfaces/Uplink.js
@@ -1,130 +1,115 @@
 import { decodeHtmlEntities } from 'common/string';
-import { Component, Fragment } from 'inferno';
-import { act } from '../byond';
-import { Box, Button, Input, Section, Table, Tabs } from '../components';
+import { Fragment } from 'inferno';
 import { useBackend } from '../backend';
+import { Box, Button, Input, Section, Table, Tabs } from '../components';
 import { Window } from '../layouts';
+import { useGlobal } from '../store';
 
 // It's a class because we need to store state in the form of the current
 // hovered item, and current search terms
-export class Uplink extends Component {
-  constructor() {
-    super();
-    this.state = {
-      hoveredItem: {},
-      currentSearch: '',
-    };
-  }
-
-  setHoveredItem(hoveredItem) {
-    this.setState({
-      hoveredItem,
-    });
-  }
-
-  setSearchText(currentSearch) {
-    this.setState({
-      currentSearch,
-    });
-  }
-
-  render() {
-    const { act, data } = useBackend(this.context);
-    const {
-      compact_mode,
-      lockable,
-      telecrystals,
-      categories = [],
-    } = data;
-    const { hoveredItem, currentSearch } = this.state;
-    return (
-      <Window
-        theme="syndicate"
-        resizable>
-        <Window.Content scrollable>
-          <Section
-            title={(
-              <Box
-                inline
-                color={telecrystals > 0 ? 'good' : 'bad'}>
-                {telecrystals} TC
-              </Box>
-            )}
-            buttons={(
-              <Fragment>
-                Search
-                <Input
-                  value={currentSearch}
-                  onInput={(e, value) => this.setSearchText(value)}
-                  ml={1}
-                  mr={1} />
+export const Uplink = (props, context) => {
+  const { act, data } = useBackend(context);
+  const {
+    compact_mode,
+    lockable,
+    telecrystals,
+    categories = [],
+  } = data;
+  const [
+    hoveredItem,
+    setHoveredItem,
+  ] = useGlobal(context, 'hoveredItem', {});
+  const [
+    searchText,
+    setSearchText,
+  ] = useGlobal(context, 'searchText', '');
+  return (
+    <Window
+      theme="syndicate"
+      resizable>
+      <Window.Content scrollable>
+        <Section
+          title={(
+            <Box
+              inline
+              color={telecrystals > 0 ? 'good' : 'bad'}>
+              {telecrystals} TC
+            </Box>
+          )}
+          buttons={(
+            <Fragment>
+              Search
+              <Input
+                value={searchText}
+                onInput={(e, value) => setSearchText(value)}
+                ml={1}
+                mr={1} />
+              <Button
+                icon={compact_mode ? 'list' : 'info'}
+                content={compact_mode ? 'Compact' : 'Detailed'}
+                onClick={() => act('compact_toggle')} />
+              {!!lockable && (
                 <Button
-                  icon={compact_mode ? 'list' : 'info'}
-                  content={compact_mode ? 'Compact' : 'Detailed'}
-                  onClick={() => act('compact_toggle')} />
-                {!!lockable && (
-                  <Button
-                    icon="lock"
-                    content="Lock"
-                    onClick={() => act('lock')} />
-                )}
-              </Fragment>
-            )}>
-            {currentSearch.length > 0 ? (
-              <table className="Table">
-                <ItemList
-                  compact
-                  items={categories
-                    .flatMap(category => {
-                      return category.items || [];
-                    })
-                    .filter(item => {
-                      const searchTerm = currentSearch.toLowerCase();
-                      const searchableString = String(item.name + item.desc)
-                        .toLowerCase();
-                      return searchableString.includes(searchTerm);
-                    })}
-                  hoveredItem={hoveredItem}
-                  onBuyMouseOver={item => this.setHoveredItem(item)}
-                  onBuyMouseOut={item => this.setHoveredItem({})}
-                  onBuy={item => act('buy', {
-                    item: item.name,
-                  })} />
-              </table>
-            ) : (
-              <Tabs vertical>
-                {categories.map(category => {
-                  const { name, items } = category;
-                  if (items === null) {
-                    return;
-                  }
-                  return (
-                    <Tabs.Tab
-                      key={name}
-                      label={`${name} (${items.length})`}>
-                      {() => (
-                        <ItemList
-                          compact={compact_mode}
-                          items={items}
-                          hoveredItem={hoveredItem}
-                          telecrystals={telecrystals}
-                          onBuyMouseOver={item => this.setHoveredItem(item)}
-                          onBuyMouseOut={item => this.setHoveredItem({})}
-                          onBuy={item => act('buy', {
-                            item: item.name,
-                          })} />
-                      )}
-                    </Tabs.Tab>
-                  );
-                })}
-              </Tabs>
-            )}
-          </Section>
-        </Window.Content>
-      </Window>
-    );
-  }
-}
+                  icon="lock"
+                  content="Lock"
+                  onClick={() => act('lock')} />
+              )}
+            </Fragment>
+          )}>
+          {searchText.length > 0 ? (
+            <table className="Table">
+              <ItemList
+                compact
+                items={categories
+                  .flatMap(category => {
+                    return category.items || [];
+                  })
+                  .filter(item => {
+                    const searchTerm = searchText.toLowerCase();
+                    const searchableString = String(item.name + item.desc)
+                      .toLowerCase();
+                    return searchableString.includes(searchTerm);
+                  })}
+                hoveredItem={hoveredItem}
+                onBuyMouseOver={item => setHoveredItem(item)}
+                onBuyMouseOut={item => setHoveredItem({})}
+                onBuy={item => act('buy', {
+                  item: item.name,
+                })} />
+            </table>
+          ) : (
+            <Tabs vertical>
+              {categories.map(category => {
+                const { name, items } = category;
+                if (items === null) {
+                  return;
+                }
+                return (
+                  <Tabs.Tab
+                    key={name}
+                    label={`${name} (${items.length})`}>
+                    {() => (
+                      <ItemList
+                        compact={compact_mode}
+                        items={items}
+                        hoveredItem={hoveredItem}
+                        telecrystals={telecrystals}
+                        onBuyMouseOver={item => setHoveredItem(item)}
+                        onBuyMouseOut={item => setHoveredItem({})}
+                        onBuy={item => act('buy', {
+                          item: item.name,
+                        })} />
+                    )}
+                  </Tabs.Tab>
+                );
+              })}
+            </Tabs>
+          )}
+        </Section>
+      </Window.Content>
+    </Window>
+  );
+};
 
 const ItemList = props => {
   const {
diff --git a/tgui/packages/tgui/store.js b/tgui/packages/tgui/store.js
index 2fc95f6476e..a0cc9eb72c7 100644
--- a/tgui/packages/tgui/store.js
+++ b/tgui/packages/tgui/store.js
@@ -11,6 +11,7 @@ export const createStore = () => {
     // Global state reducers
     backendReducer,
     hotKeyReducer,
+    globalStateReducer,
   ]);
   const middleware = [
     // loggingMiddleware,
@@ -29,3 +30,51 @@ export class StoreProvider extends Component {
     return this.props.children;
   }
 }
+
+export const useDispatch = context => {
+  return context.store.dispatch;
+};
+
+/**
+ * Allocates a global variable on Redux store.
+ *
+ * Great when you want to store some UI state globally, without having to
+ * modify DM object you're working with to have that var and export it via
+ * ui_data.
+ *
+ * @param {any} context React context.
+ * @param {string} key Key which uniquely identifies this state in Redux store.
+ * @param {any} initialState Initializes your global variable with this value.
+ */
+export const useGlobal = (context, key, initialState) => {
+  const { store } = context;
+  const globalObj = store.getState().global ?? {};
+  const state = (key in globalObj)
+    ? globalObj[key]
+    : initialState;
+  const setState = nextState => {
+    store.dispatch({
+      type: 'setGlobal',
+      payload: { key, nextState },
+    });
+  };
+  return [state, setState];
+};
+
+/**
+ * Reducer, which handles actions coming from useGlobal.
+ */
+const globalStateReducer = (state, action) => {
+  const { type, payload } = action;
+  if (type === 'setGlobal') {
+    const { key, nextState } = payload;
+    return {
+      ...state,
+      global: {
+        ...state.global,
+        [key]: nextState,
+      },
+    };
+  }
+  return state;
+};