added [go to latest message] button

css/base.css

@@ -478,19 +478,29 @@ div.trusted-badge {
   min-height: unset;
   padding: 0;
   margin: 0;
-  line-height: 3.25rem;
   outline: none; /* otherwise a square outline is shown */
   box-shadow: 0 2px 0.5rem 0 rgba(0, 0, 0, 0.25);
-  transition: all 250ms;
+  transition: all 150ms;
   z-index: 2;
 }
 
 .action-button:focus, .action-button:hover {
   color: #888;
+  background-color: #f0f0f0;
 }
 .action-button:active {
   color: #777;
-  background-color: #e0e0e0;
+  background-color: #eee;
+}
+
+.action-button.hidden {
+  width: 1px;
+  height: 1px;
+  font-size: 1px;
+  line-height: 1px;
+  right: 2.625rem;
+  bottom: 2.625rem;
+  opacity: 0;
 }
 
 /* Element which can take focus but shows no outline */

src/views/messages-view.jsx

@@ -16,17 +16,17 @@ import LoadSpinner from '../widgets/load-spinner.jsx';
 import LogoView from './logo-view.jsx';
 import SendMessage from '../widgets/send-message.jsx';
 
-import { DEFAULT_P2P_ACCESS_MODE, IMAGE_PREVIEW_DIM, IMAGE_THUMBNAIL_DIM, KEYPRESS_DELAY,
+import { DEFAULT_P2P_ACCESS_MODE, IMAGE_PREVIEW_DIM, KEYPRESS_DELAY,
   MESSAGES_PAGE, MAX_EXTERN_ATTACHMENT_SIZE, MAX_IMAGE_DIM, MAX_INBAND_ATTACHMENT_SIZE,
   READ_DELAY, QUOTED_REPLY_LENGTH } from '../config.js';
-import { SUPPORTED_IMAGE_FORMATS, blobToBase64, base64ToBlob, filePasted, fileToBase64,
+import { blobToBase64, fileToBase64, imageScaled, makeImageUrl } from '../lib/blob-helpers.js';
-  imageScaled, makeImageUrl } from '../lib/blob-helpers.js';
 import HashNavigation from '../lib/navigation.js';
-import { bytesToHumanSize, shortDateFormat, letterTileColorId } from '../lib/strformat.js';
+import { bytesToHumanSize, shortDateFormat } from '../lib/strformat.js';
-import { sanitizeImageUrl } from '../lib/utils.js';
 
 // Run timer with this frequency (ms) for checking notification queue.
 const NOTIFICATION_EXEC_INTERVAL = 300;
+// Scroll distance before [go to latest message] button is shown.
+const SHOW_GO_TO_LAST_DIST = 100;
 
 const messages = defineMessages({
   online_now: {
@@ -110,6 +110,7 @@ class MessagesView extends React.Component {
     this.handleCancelUpload = this.handleCancelUpload.bind(this);
     this.postReadNotification = this.postReadNotification.bind(this);
     this.clearNotificationQueue = this.clearNotificationQueue.bind(this);
+    this.goToLatestMessage = this.goToLatestMessage.bind(this);
 
     this.handlePickReply = this.handlePickReply.bind(this);
     this.handleCancelReply = this.handleCancelReply.bind(this);
@@ -149,13 +150,13 @@ class MessagesView extends React.Component {
   // Scroll last message into view on component update e.g. on message received
   // or vertical shrinking.
   componentDidUpdate(prevProps, prevState) {
-    if (this.messagesScroller) {
+    if (this.messagesScroller &&
-      if (prevState.topic != this.state.topic || prevState.messageCount != this.state.messageCount) {
+      (prevState.topic != this.state.topic || prevState.messageCount != this.state.messageCount)) {
-        // New message
+      // New message.
-        this.messagesScroller.scrollTop = this.messagesScroller.scrollHeight - this.state.scrollPosition;
+      if (this.state.scrollPosition < SHOW_GO_TO_LAST_DIST) {
-      } else if (prevProps.viewportHeight > this.props.viewportHeight) {
+        this.messagesScroller.scrollTop = this.messagesScroller.scrollHeight -
-        // Componet changed height.
+          this.state.scrollPosition -
-        this.messagesScroller.scrollTop += prevProps.viewportHeight - this.props.viewportHeight;
+          this.messagesScroller.offsetHeight;
       }
     }
 
@@ -210,7 +211,8 @@ class MessagesView extends React.Component {
         fetchingMessages: false,
         peerMessagingDisabled: false,
         channel: false,
-        reply: null
+        reply: null,
+        showGoToLastButton: false
       };
     } else if (nextProps.topic != prevState.topic) {
       const topic = nextProps.tinode.getTopic(nextProps.topic);
@@ -234,7 +236,8 @@ class MessagesView extends React.Component {
         typingIndicator: false,
         scrollPosition: 0,
         fetchingMessages: false,
-        reply: reply
+        reply: reply,
+        showGoToLastButton: false
       };
 
       if (topic) {
@@ -405,6 +408,7 @@ class MessagesView extends React.Component {
     }
   }
 
+  // Don't use React.createRef as the ref.current is not available in componentDidMount in this component.
   handleScrollReference(node) {
     if (node) {
       node.addEventListener('scroll', this.handleScrollEvent);
@@ -413,9 +417,14 @@ class MessagesView extends React.Component {
     }
   }
 
-  // Get older messages
+  // Get older messages and show/hide [go to latest message] button.
   handleScrollEvent(event) {
-    this.setState({scrollPosition: event.target.scrollHeight - event.target.scrollTop});
+    const pos = event.target.scrollHeight - event.target.scrollTop - event.target.offsetHeight;
+    this.setState({
+      scrollPosition: pos,
+      showGoToLastButton: pos > SHOW_GO_TO_LAST_DIST,
+    });
+
     if (this.state.fetchingMessages) {
       return;
     }
@@ -432,6 +441,13 @@ class MessagesView extends React.Component {
     }
   }
 
+  goToLatestMessage() {
+    this.setState({scrollPosition: 0});
+    if (this.messagesScroller) {
+      this.messagesScroller.scrollTop = this.messagesScroller.scrollHeight;
+    }
+  }
+
   handleDescChange(desc) {
     if (desc.public) {
       this.setState({
@@ -557,7 +573,11 @@ class MessagesView extends React.Component {
     // Scroll to the bottom if the message is added to the end of the message list.
     // TODO: This should be replaced by showing a "scroll to bottom" button.
     if (topic.isNewMessage(msg.seq)) {
-      this.setState({scrollPosition: 0});
+      if (this.state.scrollPosition > SHOW_GO_TO_LAST_DIST) {
+        this.setState({showGoToLastButton: true});
+      } else {
+        this.setState({scrollPosition: 0});
+      }
     }
 
     // Aknowledge messages except own messages. They are
@@ -1082,7 +1102,8 @@ class MessagesView extends React.Component {
               : null}
             <LoadSpinner show={this.state.fetchingMessages} />
             <div id="messages-container">
-              <button className="action-button">
+              <button className={'action-button' + (this.state.showGoToLastButton ? '' : ' hidden')}
+                onClick={this.goToLatestMessage}>
                 <i className="material-icons">arrow_downward</i>
               </button>
               <div id="messages-panel" ref={this.handleScrollReference}>

umd/index.dev.js

@@ -3266,7 +3266,6 @@ __webpack_require__.r(__webpack_exports__);
 /* harmony import */ var _lib_blob_helpers_js__WEBPACK_IMPORTED_MODULE_15__ = __webpack_require__(/*! ../lib/blob-helpers.js */ "./src/lib/blob-helpers.js");
 /* harmony import */ var _lib_navigation_js__WEBPACK_IMPORTED_MODULE_16__ = __webpack_require__(/*! ../lib/navigation.js */ "./src/lib/navigation.js");
 /* harmony import */ var _lib_strformat_js__WEBPACK_IMPORTED_MODULE_17__ = __webpack_require__(/*! ../lib/strformat.js */ "./src/lib/strformat.js");
-/* harmony import */ var _lib_utils_js__WEBPACK_IMPORTED_MODULE_18__ = __webpack_require__(/*! ../lib/utils.js */ "./src/lib/utils.js");
 
 
 
@@ -3286,8 +3285,8 @@ const Drafty = (tinode_sdk__WEBPACK_IMPORTED_MODULE_2___default().Drafty);
 
 
 
-
 const NOTIFICATION_EXEC_INTERVAL = 300;
+const SHOW_GO_TO_LAST_DIST = 100;
 const messages = (0,react_intl__WEBPACK_IMPORTED_MODULE_1__.defineMessages)({
   online_now: {
     id: "online_now",
@@ -3393,6 +3392,7 @@ class MessagesView extends (react__WEBPACK_IMPORTED_MODULE_0___default().Compone
     this.handleCancelUpload = this.handleCancelUpload.bind(this);
     this.postReadNotification = this.postReadNotification.bind(this);
     this.clearNotificationQueue = this.clearNotificationQueue.bind(this);
+    this.goToLatestMessage = this.goToLatestMessage.bind(this);
     this.handlePickReply = this.handlePickReply.bind(this);
     this.handleCancelReply = this.handleCancelReply.bind(this);
     this.handleQuoteClick = this.handleQuoteClick.bind(this);
@@ -3427,11 +3427,9 @@ class MessagesView extends (react__WEBPACK_IMPORTED_MODULE_0___default().Compone
   }
 
   componentDidUpdate(prevProps, prevState) {
-    if (this.messagesScroller) {
+    if (this.messagesScroller && (prevState.topic != this.state.topic || prevState.messageCount != this.state.messageCount)) {
-      if (prevState.topic != this.state.topic || prevState.messageCount != this.state.messageCount) {
+      if (this.state.scrollPosition < SHOW_GO_TO_LAST_DIST) {
-        this.messagesScroller.scrollTop = this.messagesScroller.scrollHeight - this.state.scrollPosition;
+        this.messagesScroller.scrollTop = this.messagesScroller.scrollHeight - this.state.scrollPosition - this.messagesScroller.offsetHeight;
-      } else if (prevProps.viewportHeight > this.props.viewportHeight) {
-        this.messagesScroller.scrollTop += prevProps.viewportHeight - this.props.viewportHeight;
       }
     }
 
@@ -3485,7 +3483,8 @@ class MessagesView extends (react__WEBPACK_IMPORTED_MODULE_0___default().Compone
         fetchingMessages: false,
         peerMessagingDisabled: false,
         channel: false,
-        reply: null
+        reply: null,
+        showGoToLastButton: false
       };
     } else if (nextProps.topic != prevState.topic) {
       const topic = nextProps.tinode.getTopic(nextProps.topic);
@@ -3508,7 +3507,8 @@ class MessagesView extends (react__WEBPACK_IMPORTED_MODULE_0___default().Compone
         typingIndicator: false,
         scrollPosition: 0,
         fetchingMessages: false,
-        reply: reply
+        reply: reply,
+        showGoToLastButton: false
       };
 
       if (topic) {
@@ -3692,8 +3692,10 @@ class MessagesView extends (react__WEBPACK_IMPORTED_MODULE_0___default().Compone
   }
 
   handleScrollEvent(event) {
+    const pos = event.target.scrollHeight - event.target.scrollTop - event.target.offsetHeight;
     this.setState({
-      scrollPosition: event.target.scrollHeight - event.target.scrollTop
+      scrollPosition: pos,
+      showGoToLastButton: pos > SHOW_GO_TO_LAST_DIST
     });
 
     if (this.state.fetchingMessages) {
@@ -3715,6 +3717,16 @@ class MessagesView extends (react__WEBPACK_IMPORTED_MODULE_0___default().Compone
     }
   }
 
+  goToLatestMessage() {
+    this.setState({
+      scrollPosition: 0
+    });
+
+    if (this.messagesScroller) {
+      this.messagesScroller.scrollTop = this.messagesScroller.scrollHeight;
+    }
+  }
+
   handleDescChange(desc) {
     if (desc.public) {
       this.setState({
@@ -3843,9 +3855,17 @@ class MessagesView extends (react__WEBPACK_IMPORTED_MODULE_0___default().Compone
     });
 
     if (topic.isNewMessage(msg.seq)) {
-      this.setState({
+      console.log("new message", this.state.scrollPosition, SHOW_GO_TO_LAST_DIST);
-        scrollPosition: 0
+
-      });
+      if (this.state.scrollPosition > SHOW_GO_TO_LAST_DIST) {
+        this.setState({
+          showGoToLastButton: true
+        });
+      } else {
+        this.setState({
+          scrollPosition: 0
+        });
+      }
     }
 
     const status = topic.msgStatus(msg, true);
@@ -4412,7 +4432,8 @@ class MessagesView extends (react__WEBPACK_IMPORTED_MODULE_0___default().Compone
         }), react__WEBPACK_IMPORTED_MODULE_0___default().createElement("div", {
           id: "messages-container"
         }, react__WEBPACK_IMPORTED_MODULE_0___default().createElement("button", {
-          className: "action-button"
+          className: 'action-button' + (this.state.showGoToLastButton ? '' : ' hidden'),
+          onClick: this.goToLatestMessage
         }, react__WEBPACK_IMPORTED_MODULE_0___default().createElement("i", {
           className: "material-icons"
         }, "arrow_downward")), react__WEBPACK_IMPORTED_MODULE_0___default().createElement("div", {