Merge pull request #3098 from matrix-org/t3chguy/restore_composer_his…

…tory

Restore Composer History under shift-up & down

src/ComposerHistoryManager.js

@@ -0,0 +1,86 @@
+//@flow
+/*
+Copyright 2017 Aviral Dasgupta
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {Value} from 'slate';
+
+import _clamp from 'lodash/clamp';
+
+type MessageFormat = 'rich' | 'markdown';
+
+class HistoryItem {
+    // We store history items in their native format to ensure history is accurate
+    // and then convert them if our RTE has subsequently changed format.
+    value: Value;
+    format: MessageFormat = 'rich';
+
+    constructor(value: ?Value, format: ?MessageFormat) {
+        this.value = value;
+        this.format = format;
+    }
+
+    static fromJSON(obj: Object): HistoryItem {
+        return new HistoryItem(
+            Value.fromJSON(obj.value),
+            obj.format,
+        );
+    }
+
+    toJSON(): Object {
+        return {
+            value: this.value.toJSON(),
+            format: this.format,
+        };
+    }
+}
+
+export default class ComposerHistoryManager {
+    history: Array<HistoryItem> = [];
+    prefix: string;
+    lastIndex: number = 0; // used for indexing the storage
+    currentIndex: number = 0; // used for indexing the loaded validated history Array
+
+    constructor(roomId: string, prefix: string = 'mx_composer_history_') {
+        this.prefix = prefix + roomId;
+
+        // TODO: Performance issues?
+        let item;
+        for (; item = sessionStorage.getItem(`${this.prefix}[${this.currentIndex}]`); this.currentIndex++) {
+            try {
+                this.history.push(
+                    HistoryItem.fromJSON(JSON.parse(item)),
+                );
+            } catch (e) {
+                console.warn("Throwing away unserialisable history", e);
+            }
+        }
+        this.lastIndex = this.currentIndex;
+        // reset currentIndex to account for any unserialisable history
+        this.currentIndex = this.history.length;
+    }
+
+    save(value: Value, format: MessageFormat) {
+        const item = new HistoryItem(value, format);
+        this.history.push(item);
+        this.currentIndex = this.history.length;
+        sessionStorage.setItem(`${this.prefix}[${this.lastIndex++}]`, JSON.stringify(item.toJSON()));
+    }
+
+    getItem(offset: number): ?HistoryItem {
+        this.currentIndex = _clamp(this.currentIndex + offset, 0, this.history.length - 1);
+        return this.history[this.currentIndex];
+    }
+}

src/components/structures/LoggedInView.js

@@ -292,16 +292,6 @@ const LoggedInView = React.createClass({
         const ctrlCmdOnly = isOnlyCtrlOrCmdKeyEvent(ev);
 
         switch (ev.keyCode) {
-            case KeyCode.UP:
-            case KeyCode.DOWN:
-                if (ev.altKey && !ev.shiftKey && !ev.ctrlKey && !ev.metaKey) {
-                    const action = ev.keyCode == KeyCode.UP ?
-                        'view_prev_room' : 'view_next_room';
-                    dis.dispatch({action: action});
-                    handled = true;
-                }
-                break;
-
             case KeyCode.PAGE_UP:
             case KeyCode.PAGE_DOWN:
                 if (!ev.ctrlKey && !ev.shiftKey && !ev.altKey && !ev.metaKey) {

src/components/views/rooms/MessageComposerInput.js

@@ -60,6 +60,7 @@ import ReplyThread from "../elements/ReplyThread";
 import {ContentHelpers} from 'matrix-js-sdk';
 import AccessibleButton from '../elements/AccessibleButton';
 import {findEditableEvent} from '../../../utils/EventUtils';
+import ComposerHistoryManager from "../../../ComposerHistoryManager";
 
 const REGEX_EMOTICON_WHITESPACE = new RegExp('(?:^|\\s)(' + EMOTICON_REGEX.source + ')\\s$');
 
@@ -140,6 +141,7 @@ export default class MessageComposerInput extends React.Component {
 
     client: MatrixClient;
     autocomplete: Autocomplete;
+    historyManager: ComposerHistoryManager;
 
     constructor(props, context) {
         super(props, context);
@@ -329,6 +331,7 @@ export default class MessageComposerInput extends React.Component {
 
     componentWillMount() {
         this.dispatcherRef = dis.register(this.onAction);
+        this.historyManager = new ComposerHistoryManager(this.props.room.roomId, 'mx_slate_composer_history_');
     }
 
     componentWillUnmount() {
@@ -1062,6 +1065,7 @@ export default class MessageComposerInput extends React.Component {
 
         if (cmd) {
             if (!cmd.error) {
+                this.historyManager.save(editorState, this.state.isRichTextEnabled ? 'rich' : 'markdown');
                 this.setState({
                     editorState: this.createEditorState(),
                 }, ()=>{
@@ -1139,6 +1143,8 @@ export default class MessageComposerInput extends React.Component {
         let sendHtmlFn = ContentHelpers.makeHtmlMessage;
         let sendTextFn = ContentHelpers.makeTextMessage;
 
+        this.historyManager.save(editorState, this.state.isRichTextEnabled ? 'rich' : 'markdown');
+
         if (commandText && commandText.startsWith('/me')) {
             if (replyingToEv) {
                 const ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
@@ -1198,31 +1204,88 @@ export default class MessageComposerInput extends React.Component {
     };
 
     onVerticalArrow = (e, up) => {
-        if (e.ctrlKey || e.shiftKey || e.altKey || e.metaKey) return;
+        if (e.ctrlKey || e.shiftKey || e.metaKey) return;
 
-        // Select history
-        const selection = this.state.editorState.selection;
+        if (e.altKey) {
+            // Try select composer history
+            const selected = this.selectHistory(up);
+            if (selected) {
+                // We're selecting history, so prevent the key event from doing anything else
+                e.preventDefault();
+            }
+        } else if (!e.altKey && up) {
+            // Try edit the latest message
+            const selection = this.state.editorState.selection;
 
-        // selection must be collapsed
-        if (!selection.isCollapsed) return;
-        const document = this.state.editorState.document;
+            // selection must be collapsed
+            if (!selection.isCollapsed) return;
+            const document = this.state.editorState.document;
 
-        // and we must be at the edge of the document (up=start, down=end)
-        if (up) {
+            // and we must be at the edge of the document (up=start, down=end)
             if (!selection.anchor.isAtStartOfNode(document)) return;
 
-            const editEvent = findEditableEvent(this.props.room, false);
-            if (editEvent) {
-                // We're selecting history, so prevent the key event from doing anything else
-                e.preventDefault();
-                dis.dispatch({
-                    action: 'edit_event',
-                    event: editEvent,
-                });
+            if (!e.altKey) {
+                const editEvent = findEditableEvent(this.props.room, false);
+                if (editEvent) {
+                    // We're selecting history, so prevent the key event from doing anything else
+                    e.preventDefault();
+                    dis.dispatch({
+                        action: 'edit_event',
+                        event: editEvent,
+                    });
+                }
             }
         }
     };
 
+    selectHistory = async (up) => {
+        const delta = up ? -1 : 1;
+
+        // True if we are not currently selecting history, but composing a message
+        if (this.historyManager.currentIndex === this.historyManager.history.length) {
+            // We can't go any further - there isn't any more history, so nop.
+            if (!up) {
+                return;
+            }
+            this.setState({
+                currentlyComposedEditorState: this.state.editorState,
+            });
+        } else if (this.historyManager.currentIndex + delta === this.historyManager.history.length) {
+            // True when we return to the message being composed currently
+            this.setState({
+                editorState: this.state.currentlyComposedEditorState,
+            });
+            this.historyManager.currentIndex = this.historyManager.history.length;
+            return;
+        }
+
+        let editorState;
+        const historyItem = this.historyManager.getItem(delta);
+        if (!historyItem) return;
+
+        if (historyItem.format === 'rich' && !this.state.isRichTextEnabled) {
+            editorState = this.richToMdEditorState(historyItem.value);
+        } else if (historyItem.format === 'markdown' && this.state.isRichTextEnabled) {
+            editorState = this.mdToRichEditorState(historyItem.value);
+        } else {
+            editorState = historyItem.value;
+        }
+
+        // Move selection to the end of the selected history
+        const change = editorState.change().moveToEndOfNode(editorState.document);
+
+        // We don't call this.onChange(change) now, as fixups on stuff like pills
+        // should already have been done and persisted in the history.
+        editorState = change.value;
+
+        this.suppressAutoComplete = true;
+
+        this.setState({ editorState }, ()=>{
+            this._editor.focus();
+        });
+        return true;
+    };
+
     onTab = async (e) => {
         this.setState({
             someCompletions: null,