synapse/webclient/room/room-controller.js
2014-09-18 18:18:30 +01:00

952 lines
37 KiB
JavaScript

/*
Copyright 2014 OpenMarket Ltd
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.
*/
angular.module('RoomController', ['ngSanitize', 'matrixFilter', 'mFileInput'])
.controller('RoomController', ['$filter', '$scope', '$timeout', '$routeParams', '$location', '$rootScope', 'matrixService', 'mPresence', 'eventHandlerService', 'mFileUpload', 'matrixPhoneService', 'MatrixCall',
function($filter, $scope, $timeout, $routeParams, $location, $rootScope, matrixService, mPresence, eventHandlerService, mFileUpload, matrixPhoneService, MatrixCall) {
'use strict';
var MESSAGES_PER_PAGINATION = 30;
var THUMBNAIL_SIZE = 320;
// Room ids. Computed and resolved in onInit
$scope.room_id = undefined;
$scope.room_alias = undefined;
$scope.state = {
user_id: matrixService.config().user_id,
permission_denied: undefined, // If defined, this string contains the reason why the user cannot join the room
first_pagination: true, // this is toggled off when the first pagination is done
can_paginate: false, // this is toggled off when we are not ready yet to paginate or when we run out of items
paginating: false, // used to avoid concurrent pagination requests pulling in dup contents
stream_failure: undefined, // the response when the stream fails
waiting_for_joined_event: false, // true when the join request is pending. Back to false once the corresponding m.room.member event is received
messages_visibility: "hidden" // In order to avoid flickering when scrolling down the message table at the page opening, delay the message table display
};
$scope.members = {};
$scope.autoCompleting = false;
$scope.autoCompleteIndex = 0;
$scope.autoCompleteOriginal = "";
$scope.imageURLToSend = "";
$scope.userIDToInvite = "";
// vars and functions for updating the name
$scope.name = {
isEditing: false,
newNameText: "",
editName: function() {
if ($scope.name.isEditing) {
console.log("Warning: Already editing name.");
return;
};
var nameEvent = $rootScope.events.rooms[$scope.room_id]['m.room.name'];
if (nameEvent) {
$scope.name.newNameText = nameEvent.content.name;
}
else {
$scope.name.newNameText = "";
}
// Force focus to the input
$timeout(function() {
angular.element('.roomNameInput').focus();
}, 0);
$scope.name.isEditing = true;
},
updateName: function() {
console.log("Updating name to "+$scope.name.newNameText);
matrixService.setName($scope.room_id, $scope.name.newNameText).then(
function() {
},
function(error) {
$scope.feedback = "Request failed: " + error.data.error;
}
);
$scope.name.isEditing = false;
},
cancelEdit: function() {
$scope.name.isEditing = false;
}
};
// vars and functions for updating the topic
$scope.topic = {
isEditing: false,
newTopicText: "",
editTopic: function() {
if ($scope.topic.isEditing) {
console.log("Warning: Already editing topic.");
return;
}
var topicEvent = $rootScope.events.rooms[$scope.room_id]['m.room.topic'];
if (topicEvent) {
$scope.topic.newTopicText = topicEvent.content.topic;
}
else {
$scope.topic.newTopicText = "";
}
// Force focus to the input
$timeout(function() {
angular.element('.roomTopicInput').focus();
}, 0);
$scope.topic.isEditing = true;
},
updateTopic: function() {
console.log("Updating topic to "+$scope.topic.newTopicText);
matrixService.setTopic($scope.room_id, $scope.topic.newTopicText).then(
function() {
},
function(error) {
$scope.feedback = "Request failed: " + error.data.error;
}
);
$scope.topic.isEditing = false;
},
cancelEdit: function() {
$scope.topic.isEditing = false;
}
};
var scrollToBottom = function(force) {
console.log("Scrolling to bottom");
// Do not autoscroll to the bottom to display the new event if the user is not at the bottom.
// Exception: in case where the event is from the user, we want to force scroll to the bottom
var objDiv = document.getElementById("messageTableWrapper");
if ((objDiv.offsetHeight + objDiv.scrollTop >= objDiv.scrollHeight) || force) {
$timeout(function() {
objDiv.scrollTop = objDiv.scrollHeight;
// Show the message table once the first scrolldown is done
if ("visible" !== $scope.state.messages_visibility) {
$timeout(function() {
$scope.state.messages_visibility = "visible";
}, 0);
}
}, 0);
}
};
$scope.$on(eventHandlerService.MSG_EVENT, function(ngEvent, event, isLive) {
if (isLive && event.room_id === $scope.room_id) {
scrollToBottom();
}
});
$scope.$on(eventHandlerService.MEMBER_EVENT, function(ngEvent, event, isLive) {
if (isLive && event.room_id === $scope.room_id) {
if ($scope.state.waiting_for_joined_event) {
// The user has successfully joined the room, we can getting data for this room
$scope.state.waiting_for_joined_event = false;
onInit3();
}
else if (event.state_key === $scope.state.user_id && "invite" !== event.membership && "join" !== event.membership) {
var user;
if ($scope.members[event.user_id]) {
user = $scope.members[event.user_id].displayname;
}
if (user) {
user = user + " (" + event.user_id + ")";
}
else {
user = event.user_id;
}
if ("ban" === event.membership) {
$scope.state.permission_denied = "You have been banned by " + user;
}
else {
$scope.state.permission_denied = "You have been kicked by " + user;
}
}
else {
scrollToBottom();
updateMemberList(event);
// Notify when a user joins
if ((document.hidden || matrixService.presence.unavailable === mPresence.getState())
&& event.state_key !== $scope.state.user_id && "join" === event.membership) {
var notification = new window.Notification(
event.content.displayname +
" (" + (matrixService.getRoomIdToAliasMapping(event.room_id) || event.room_id) + ")", // FIXME: don't leak room_ids here
{
"body": event.content.displayname + " joined",
"icon": event.content.avatar_url ? event.content.avatar_url : undefined
});
$timeout(function() {
notification.close();
}, 5 * 1000);
}
}
}
});
$scope.$on(eventHandlerService.PRESENCE_EVENT, function(ngEvent, event, isLive) {
if (isLive) {
updatePresence(event);
}
});
$scope.$on(eventHandlerService.POWERLEVEL_EVENT, function(ngEvent, event, isLive) {
if (isLive && event.room_id === $scope.room_id) {
for (var user_id in event.content) {
updateUserPowerLevel(user_id);
}
}
});
$scope.memberCount = function() {
return Object.keys($scope.members).length;
};
$scope.paginateMore = function() {
if ($scope.state.can_paginate) {
// console.log("Paginating more.");
paginate(MESSAGES_PER_PAGINATION);
}
};
var paginate = function(numItems) {
//console.log("paginate " + numItems + " and first_pagination is " + $scope.state.first_pagination);
if ($scope.state.paginating || !$scope.room_id) {
return;
}
else {
$scope.state.paginating = true;
}
console.log("paginateBackMessages from " + $rootScope.events.rooms[$scope.room_id].pagination.earliest_token + " for " + numItems);
var originalTopRow = $("#messageTable>tbody>tr:first")[0];
// Paginate events from the point in cache
matrixService.paginateBackMessages($scope.room_id, $rootScope.events.rooms[$scope.room_id].pagination.earliest_token, numItems).then(
function(response) {
eventHandlerService.handleRoomMessages($scope.room_id, response.data, false, 'b');
if (response.data.chunk.length < MESSAGES_PER_PAGINATION) {
// no more messages to paginate. this currently never gets turned true again, as we never
// expire paginated contents in the current implementation.
$scope.state.can_paginate = false;
}
$scope.state.paginating = false;
var wrapper = $("#messageTableWrapper")[0];
var table = $("#messageTable")[0];
// console.log("wrapper height=" + wrapper.clientHeight + ", table scrollHeight=" + table.scrollHeight);
if ($scope.state.can_paginate) {
// check we don't have to pull in more messages
// n.b. we dispatch through a timeout() to allow the digest to run otherwise the .height methods are stale
$timeout(function() {
if (table.scrollHeight < wrapper.clientHeight) {
paginate(MESSAGES_PER_PAGINATION);
scrollToBottom();
}
}, 0);
}
if ($scope.state.first_pagination) {
scrollToBottom(true);
$scope.state.first_pagination = false;
}
else {
// lock the scroll position
$timeout(function() {
// FIXME: this risks a flicker before the scrollTop is actually updated, but we have to
// dispatch it into a function in order to first update the layout. The right solution
// might be to implement it as a directive, more like
// http://stackoverflow.com/questions/23736647/how-to-retain-scroll-position-of-ng-repeat-in-angularjs
// however, this specific solution breaks because it measures the rows height before
// the contents are interpolated.
wrapper.scrollTop = originalTopRow ? (originalTopRow.offsetTop + wrapper.scrollTop) : 0;
}, 0);
}
},
function(error) {
console.log("Failed to paginateBackMessages: " + JSON.stringify(error));
$scope.state.paginating = false;
}
);
};
var updateMemberList = function(chunk) {
if (chunk.room_id != $scope.room_id) return;
// set target_user_id to keep things clear
var target_user_id = chunk.state_key;
var isNewMember = !(target_user_id in $scope.members);
if (isNewMember) {
// Ignore banned and kicked (leave) people
if ("ban" === chunk.membership || "leave" === chunk.membership) {
return;
}
// FIXME: why are we copying these fields around inside chunk?
if ("presence" in chunk.content) {
chunk.presence = chunk.content.presence;
}
if ("last_active_ago" in chunk.content) {
chunk.last_active_ago = chunk.content.last_active_ago;
$scope.now = new Date().getTime();
chunk.last_updated = $scope.now;
}
if ("displayname" in chunk.content) {
chunk.displayname = chunk.content.displayname;
}
if ("avatar_url" in chunk.content) {
chunk.avatar_url = chunk.content.avatar_url;
}
$scope.members[target_user_id] = chunk;
if (target_user_id in $rootScope.presence) {
updatePresence($rootScope.presence[target_user_id]);
}
}
else {
// selectively update membership and presence else it will nuke the picture and displayname too :/
// Remove banned and kicked (leave) people
if ("ban" === chunk.membership || "leave" === chunk.membership) {
delete $scope.members[target_user_id];
return;
}
var member = $scope.members[target_user_id];
member.membership = chunk.content.membership;
if ("presence" in chunk.content) {
member.presence = chunk.content.presence;
}
if ("last_active_ago" in chunk.content) {
member.last_active_ago = chunk.content.last_active_ago;
$scope.now = new Date().getTime();
member.last_updated = $scope.now;
}
}
};
var updateMemberListPresenceAge = function() {
$scope.now = new Date().getTime();
// TODO: don't bother polling every 5s if we know none of our counters are younger than 1 minute
$timeout(updateMemberListPresenceAge, 5 * 1000);
};
var updatePresence = function(chunk) {
if (!(chunk.content.user_id in $scope.members)) {
console.log("updatePresence: Unknown member for chunk " + JSON.stringify(chunk));
return;
}
var member = $scope.members[chunk.content.user_id];
// XXX: why not just pass the chunk straight through?
if ("presence" in chunk.content) {
member.presence = chunk.content.presence;
}
if ("last_active_ago" in chunk.content) {
member.last_active_ago = chunk.content.last_active_ago;
$scope.now = new Date().getTime();
member.last_updated = $scope.now;
}
// this may also contain a new display name or avatar url, so check.
if ("displayname" in chunk.content) {
member.displayname = chunk.content.displayname;
}
if ("avatar_url" in chunk.content) {
member.avatar_url = chunk.content.avatar_url;
}
};
var updateUserPowerLevel = function(user_id) {
var member = $scope.members[user_id];
if (member) {
member.powerLevel = matrixService.getUserPowerLevel($scope.room_id, user_id);
normaliseMembersPowerLevels();
}
};
// Normalise users power levels so that the user with the higher power level
// will have a bar covering 100% of the width of his avatar
var normaliseMembersPowerLevels = function() {
// Find the max power level
var maxPowerLevel = 0;
for (var i in $scope.members) {
var member = $scope.members[i];
if (member.powerLevel) {
maxPowerLevel = Math.max(maxPowerLevel, member.powerLevel);
}
}
// Normalized them on a 0..100% scale to be use in css width
if (maxPowerLevel) {
for (var i in $scope.members) {
var member = $scope.members[i];
member.powerLevelNorm = (member.powerLevel * 100) / maxPowerLevel;
}
}
};
$scope.send = function() {
if (undefined === $scope.textInput || $scope.textInput === "") {
return;
}
scrollToBottom(true);
// Store the command in the history
history.push($scope.textInput);
var promise;
var cmd;
var args;
var echo = false;
// Check for IRC style commands first
var line = $scope.textInput;
// trim any trailing whitespace, as it can confuse the parser for IRC-style commands
line = line.replace(/\s+$/, "");
if (line[0] === "/" && line[1] !== "/") {
var bits = line.match(/^(\S+?)( +(.*))?$/);
cmd = bits[1];
args = bits[3];
console.log("cmd: " + cmd + ", args: " + args);
switch (cmd) {
case "/me":
promise = matrixService.sendEmoteMessage($scope.room_id, args);
echo = true;
break;
case "/nick":
// Change user display name
if (args) {
promise = matrixService.setDisplayName(args);
}
else {
$scope.feedback = "Usage: /nick <display_name>";
}
break;
case "/join":
// Join a room
if (args) {
var matches = args.match(/^(\S+)$/);
if (matches) {
var room_alias = matches[1];
if (room_alias.indexOf(':') == -1) {
// FIXME: actually track the :domain style name of our homeserver
// with or without port as is appropriate and append it at this point
}
var room_id = matrixService.getAliasToRoomIdMapping(room_alias);
console.log("joining " + room_alias + " id=" + room_id);
if ($rootScope.events.rooms[room_id]) {
// don't send a join event for a room you're already in.
$location.url("room/" + room_alias);
}
else {
promise = matrixService.joinAlias(room_alias).then(
function(response) {
$location.url("room/" + room_alias);
},
function(error) {
$scope.feedback = "Can't join room: " + JSON.stringify(error.data);
}
);
}
}
}
else {
$scope.feedback = "Usage: /join <room_alias>";
}
break;
case "/kick":
// Kick a user from the room with an optional reason
if (args) {
var matches = args.match(/^(\S+?)( +(.*))?$/);
if (matches) {
promise = matrixService.kick($scope.room_id, matches[1], matches[3]);
}
}
if (!promise) {
$scope.feedback = "Usage: /kick <userId> [<reason>]";
}
break;
case "/ban":
// Ban a user from the room with an optional reason
if (args) {
var matches = args.match(/^(\S+?)( +(.*))?$/);
if (matches) {
promise = matrixService.ban($scope.room_id, matches[1], matches[3]);
}
}
if (!promise) {
$scope.feedback = "Usage: /ban <userId> [<reason>]";
}
break;
case "/unban":
// Unban a user from the room
if (args) {
var matches = args.match(/^(\S+)$/);
if (matches) {
// Reset the user membership to "leave" to unban him
promise = matrixService.unban($scope.room_id, matches[1]);
}
}
if (!promise) {
$scope.feedback = "Usage: /unban <userId>";
}
break;
case "/op":
// Define the power level of a user
if (args) {
var matches = args.match(/^(\S+?)( +(\d+))?$/);
var powerLevel = 50; // default power level for op
if (matches) {
var user_id = matches[1];
if (matches.length === 4 && undefined !== matches[3]) {
powerLevel = parseInt(matches[3]);
}
if (powerLevel !== NaN) {
promise = matrixService.setUserPowerLevel($scope.room_id, user_id, powerLevel);
}
}
}
if (!promise) {
$scope.feedback = "Usage: /op <userId> [<power level>]";
}
break;
case "/deop":
// Reset the power level of a user
if (args) {
var matches = args.match(/^(\S+)$/);
if (matches) {
promise = matrixService.setUserPowerLevel($scope.room_id, args, undefined);
}
}
if (!promise) {
$scope.feedback = "Usage: /deop <userId>";
}
break;
default:
$scope.feedback = ("Unrecognised IRC-style command: " + cmd);
break;
}
}
// By default send this as a message unless it's an IRC-style command
if (!promise && !cmd) {
// Make the request
promise = matrixService.sendTextMessage($scope.room_id, line);
echo = true;
}
if (echo) {
// Echo the message to the room
// To do so, create a minimalist fake text message event and add it to the in-memory list of room messages
var echoMessage = {
content: {
body: (cmd === "/me" ? args : line),
hsob_ts: new Date().getTime(), // fake a timestamp
msgtype: (cmd === "/me" ? "m.emote" : "m.text"),
},
room_id: $scope.room_id,
type: "m.room.message",
user_id: $scope.state.user_id,
echo_msg_state: "messagePending" // Add custom field to indicate the state of this fake message to HTML
};
$scope.textInput = "";
$rootScope.events.rooms[$scope.room_id].messages.push(echoMessage);
scrollToBottom();
}
if (promise) {
// Reset previous feedback
$scope.feedback = "";
promise.then(
function(response) {
console.log("Request successfully sent");
if (echo) {
// Mark this fake message event with its allocated event_id
// When the true message event will come from the events stream (in handleMessage),
// we will be able to replace the fake one by the true one
echoMessage.event_id = response.data.event_id;
}
else {
$scope.textInput = "";
}
},
function(error) {
$scope.feedback = "Request failed: " + error.data.error;
if (echoMessage) {
// Mark the message as unsent for the rest of the page life
echoMessage.content.hsob_ts = "Unsent";
echoMessage.echo_msg_state = "messageUnSent";
}
});
}
};
$scope.onInit = function() {
console.log("onInit");
// Does the room ID provided in the URL?
var room_id_or_alias;
if ($routeParams.room_id_or_alias) {
room_id_or_alias = decodeURIComponent($routeParams.room_id_or_alias);
}
if (room_id_or_alias && '!' === room_id_or_alias[0]) {
// Yes. We can go on right now
$scope.room_id = room_id_or_alias;
$scope.room_alias = matrixService.getRoomIdToAliasMapping($scope.room_id);
onInit2();
}
else {
// No. The URL contains the room alias. Get this alias.
if (room_id_or_alias) {
// The room alias was passed urlencoded, use it as is
$scope.room_alias = room_id_or_alias;
}
else {
// Else get the room alias by hand from the URL
// ie: extract #public:localhost:8080 from http://127.0.0.1:8000/#/room/#public:localhost:8080
if (3 === location.hash.split("#").length) {
$scope.room_alias = "#" + location.hash.split("#")[2];
}
else {
// In case of issue, go to the default page
console.log("Error: cannot extract room alias");
$location.url("/");
return;
}
}
// Need a room ID required in Matrix API requests
console.log("Resolving alias: " + $scope.room_alias);
matrixService.resolveRoomAlias($scope.room_alias).then(function(response) {
$scope.room_id = response.data.room_id;
console.log(" -> Room ID: " + $scope.room_id);
// Now, we can go on
onInit2();
},
function () {
// In case of issue, go to the default page
console.log("Error: cannot resolve room alias");
$location.url("/");
});
}
};
var onInit2 = function() {
console.log("onInit2");
// Scroll down as soon as possible so that we point to the last message
// if it already exists in memory
scrollToBottom(true);
// Make sure the initialSync has been before going further
eventHandlerService.waitForInitialSyncCompletion().then(
function() {
var needsToJoin = true;
// The room members is available in the data fetched by initialSync
if ($rootScope.events.rooms[$scope.room_id]) {
// There is no need to do a 1st pagination (initialSync provided enough to fill a page)
if ($rootScope.events.rooms[$scope.room_id].messages.length) {
$scope.state.first_pagination = false;
}
else {
// except if we just joined a room, we won't have this history from initial sync, so we should try to paginate it anyway
$scope.state.first_pagination = true;
}
var members = $rootScope.events.rooms[$scope.room_id].members;
// Update the member list
for (var i in members) {
var member = members[i];
updateMemberList(member);
}
// Check if the user has already join the room
if ($scope.state.user_id in members) {
if ("join" === members[$scope.state.user_id].membership) {
needsToJoin = false;
}
}
}
// Do we to join the room before starting?
if (needsToJoin) {
$scope.state.waiting_for_joined_event = true;
matrixService.join($scope.room_id).then(
function() {
// onInit3 will be called once the joined m.room.member event is received from the events stream
// This avoids to get the joined information twice in parallel:
// - one from the events stream
// - one from the pagination because the pagination window covers this event ts
console.log("Joined room "+$scope.room_id);
},
function(reason) {
console.log("Can't join room: " + JSON.stringify(reason));
$scope.state.permission_denied = "You do not have permission to join this room";
});
}
else {
onInit3();
}
}
);
};
var onInit3 = function() {
console.log("onInit3");
// Make recents highlight the current room
$scope.recentsSelectedRoomID = $scope.room_id;
// Init the history for this room
history.init();
// Get the up-to-date the current member list
matrixService.getMemberList($scope.room_id).then(
function(response) {
for (var i = 0; i < response.data.chunk.length; i++) {
var chunk = response.data.chunk[i];
updateMemberList(chunk);
// Add his power level
updateUserPowerLevel(chunk.user_id);
}
// Arm list timing update timer
updateMemberListPresenceAge();
// Allow pagination
$scope.state.can_paginate = true;
// Do a first pagination only if it is required
// FIXME: Should be no more require when initialSync/{room_id} will be available
if ($scope.state.first_pagination) {
paginate(MESSAGES_PER_PAGINATION);
}
else {
// There are already messages, go to the last message
scrollToBottom(true);
}
},
function(error) {
$scope.feedback = "Failed get member list: " + error.data.error;
}
);
};
$scope.inviteUser = function() {
matrixService.invite($scope.room_id, $scope.userIDToInvite).then(
function() {
console.log("Invited.");
$scope.feedback = "Invite successfully sent to " + $scope.userIDToInvite;
$scope.userIDToInvite = "";
},
function(reason) {
$scope.feedback = "Failure: " + reason;
});
};
$scope.leaveRoom = function() {
matrixService.leave($scope.room_id).then(
function(response) {
console.log("Left room ");
$location.url("home");
},
function(error) {
$scope.feedback = "Failed to leave room: " + error.data.error;
});
};
$scope.sendImage = function(url, body) {
scrollToBottom(true);
matrixService.sendImageMessage($scope.room_id, url, body).then(
function() {
console.log("Image sent");
},
function(error) {
$scope.feedback = "Failed to send image: " + error.data.error;
});
};
$scope.imageFileToSend;
$scope.$watch("imageFileToSend", function(newValue, oldValue) {
if ($scope.imageFileToSend) {
// Upload this image with its thumbnail to Internet
mFileUpload.uploadImageAndThumbnail($scope.imageFileToSend, THUMBNAIL_SIZE).then(
function(imageMessage) {
// imageMessage is complete message structure, send it as is
matrixService.sendMessage($scope.room_id, undefined, imageMessage).then(
function() {
console.log("Image message sent");
},
function(error) {
$scope.feedback = "Failed to send image message: " + error.data.error;
});
},
function(error) {
$scope.feedback = "Can't upload image";
}
);
}
});
$scope.loadMoreHistory = function() {
paginate(MESSAGES_PER_PAGINATION);
};
$scope.startVoiceCall = function() {
var call = new MatrixCall($scope.room_id);
call.onError = $rootScope.onCallError;
call.onHangup = $rootScope.onCallHangup;
call.placeCall({audio: true, video: false});
$rootScope.currentCall = call;
};
$scope.startVideoCall = function() {
var call = new MatrixCall($scope.room_id);
call.onError = $rootScope.onCallError;
call.onHangup = $rootScope.onCallHangup;
call.placeCall({audio: true, video: true});
$rootScope.currentCall = call;
};
// Manage history of typed messages
// History is saved in sessionStoratge so that it survives when the user
// navigates through the rooms and when it refreshes the page
var history = {
// The list of typed messages. Index 0 is the more recents
data: [],
// The position in the history currently displayed
position: -1,
// The message the user has started to type before going into the history
typingMessage: undefined,
// Init/load data for the current room
init: function() {
var data = sessionStorage.getItem("history_" + $scope.room_id);
if (data) {
this.data = JSON.parse(data);
}
},
// Store a message in the history
push: function(message) {
this.data.unshift(message);
// Update the session storage
sessionStorage.setItem("history_" + $scope.room_id, JSON.stringify(this.data));
// Reset history position
this.position = -1;
this.typingMessage = undefined;
},
// Move in the history
go: function(offset) {
if (-1 === this.position) {
// User starts to go to into the history, save the current line
this.typingMessage = $scope.textInput;
}
else {
// If the user modified this line in history, keep the change
this.data[this.position] = $scope.textInput;
}
// Bounds the new position to valid data
var newPosition = this.position + offset;
newPosition = Math.max(-1, newPosition);
newPosition = Math.min(newPosition, this.data.length - 1);
this.position = newPosition;
if (-1 !== this.position) {
// Show the message from the history
$scope.textInput = this.data[this.position];
}
else if (undefined !== this.typingMessage) {
// Go back to the message the user started to type
$scope.textInput = this.typingMessage;
}
}
};
// Make history singleton methods available from HTML
$scope.history = {
goUp: function($event) {
if ($scope.room_id) {
history.go(1);
}
$event.preventDefault();
},
goDown: function($event) {
if ($scope.room_id) {
history.go(-1);
}
$event.preventDefault();
}
};
}]);