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edit_session.js
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edit_session.js
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/* ***** BEGIN LICENSE BLOCK *****
* Distributed under the BSD license:
*
* Copyright (c) 2010, Ajax.org B.V.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Ajax.org B.V. nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL AJAX.ORG B.V. BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ***** END LICENSE BLOCK ***** */
define(function(require, exports, module) {
"use strict";
var oop = require("./lib/oop");
var lang = require("./lib/lang");
var config = require("./config");
var EventEmitter = require("./lib/event_emitter").EventEmitter;
var Selection = require("./selection").Selection;
var TextMode = require("./mode/text").Mode;
var Range = require("./range").Range;
var Document = require("./document").Document;
var BackgroundTokenizer = require("./background_tokenizer").BackgroundTokenizer;
var SearchHighlight = require("./search_highlight").SearchHighlight;
/**
* Stores all the data about [[Editor `Editor`]] state providing easy way to change editors state.
*
* `EditSession` can be attached to only one [[Document `Document`]]. Same `Document` can be attached to several `EditSession`s.
* @class EditSession
**/
//{ events
/**
*
* Emitted when the document changes.
* @event change
* @param {Object} e An object containing a `delta` of information about the change.
**/
/**
* Emitted when the tab size changes, via [[EditSession.setTabSize]].
*
* @event changeTabSize
**/
/**
* Emitted when the ability to overwrite text changes, via [[EditSession.setOverwrite]].
*
* @event changeOverwrite
**/
/**
* Emitted when the gutter changes, either by setting or removing breakpoints, or when the gutter decorations change.
*
* @event changeBreakpoint
**/
/**
* Emitted when a front marker changes.
*
* @event changeFrontMarker
**/
/**
* Emitted when a back marker changes.
*
* @event changeBackMarker
**/
/**
* Emitted when an annotation changes, like through [[EditSession.setAnnotations]].
*
* @event changeAnnotation
**/
/**
* Emitted when a background tokenizer asynchronously processes new rows.
* @event tokenizerUpdate
*
* @param {Object} e An object containing one property, `"data"`, that contains information about the changing rows
*
**/
/**
* Emitted when the current mode changes.
*
* @event changeMode
*
**/
/**
* Emitted when the wrap mode changes.
*
* @event changeWrapMode
*
**/
/**
* Emitted when the wrapping limit changes.
*
* @event changeWrapLimit
*
**/
/**
* Emitted when a code fold is added or removed.
*
* @event changeFold
*
**/
/**
* Emitted when the scroll top changes.
* @event changeScrollTop
*
* @param {Number} scrollTop The new scroll top value
**/
/**
* Emitted when the scroll left changes.
* @event changeScrollLeft
*
* @param {Number} scrollLeft The new scroll left value
**/
//}
/**
*
* Sets up a new `EditSession` and associates it with the given `Document` and `TextMode`.
* @param {Document | String} text [If `text` is a `Document`, it associates the `EditSession` with it. Otherwise, a new `Document` is created, with the initial text]{: #textParam}
* @param {TextMode} mode [The inital language mode to use for the document]{: #modeParam}
*
* @constructor
**/
var EditSession = function(text, mode) {
this.$breakpoints = [];
this.$decorations = [];
this.$frontMarkers = {};
this.$backMarkers = {};
this.$markerId = 1;
this.$undoSelect = true;
this.$foldData = [];
this.$foldData.toString = function() {
return this.join("\n");
}
this.on("changeFold", this.onChangeFold.bind(this));
this.$onChange = this.onChange.bind(this);
if (typeof text != "object" || !text.getLine)
text = new Document(text);
this.setDocument(text);
this.selection = new Selection(this);
config.resetOptions(this);
this.setMode(mode);
config._signal("session", this);
};
(function() {
oop.implement(this, EventEmitter);
/**
* Sets the `EditSession` to point to a new `Document`. If a `BackgroundTokenizer` exists, it also points to `doc`.
*
* @param {Document} doc The new `Document` to use
*
**/
this.setDocument = function(doc) {
if (this.doc)
this.doc.removeListener("change", this.$onChange);
this.doc = doc;
doc.on("change", this.$onChange);
if (this.bgTokenizer)
this.bgTokenizer.setDocument(this.getDocument());
this.resetCaches();
};
/**
* Returns the `Document` associated with this session.
* @return {Document}
**/
this.getDocument = function() {
return this.doc;
};
/**
* @param {Number} row The row to work with
*
**/
this.$resetRowCache = function(docRow) {
if (!docRow) {
this.$docRowCache = [];
this.$screenRowCache = [];
return;
}
var l = this.$docRowCache.length;
var i = this.$getRowCacheIndex(this.$docRowCache, docRow) + 1;
if (l > i) {
this.$docRowCache.splice(i, l);
this.$screenRowCache.splice(i, l);
}
};
this.$getRowCacheIndex = function(cacheArray, val) {
var low = 0;
var hi = cacheArray.length - 1;
while (low <= hi) {
var mid = (low + hi) >> 1;
var c = cacheArray[mid];
if (val > c)
low = mid + 1;
else if (val < c)
hi = mid - 1;
else
return mid;
}
return low -1;
};
this.resetCaches = function() {
this.$modified = true;
this.$wrapData = [];
this.$rowLengthCache = [];
this.$resetRowCache(0);
if (this.bgTokenizer)
this.bgTokenizer.start(0);
};
this.onChangeFold = function(e) {
var fold = e.data;
this.$resetRowCache(fold.start.row);
};
this.onChange = function(e) {
var delta = e.data;
this.$modified = true;
this.$resetRowCache(delta.range.start.row);
var removedFolds = this.$updateInternalDataOnChange(e);
if (!this.$fromUndo && this.$undoManager && !delta.ignore) {
this.$deltasDoc.push(delta);
if (removedFolds && removedFolds.length != 0) {
this.$deltasFold.push({
action: "removeFolds",
folds: removedFolds
});
}
this.$informUndoManager.schedule();
}
this.bgTokenizer.$updateOnChange(delta);
this._signal("change", e);
};
/**
* Sets the session text.
* @param {String} text The new text to place
*
*
*
**/
this.setValue = function(text) {
this.doc.setValue(text);
this.selection.moveCursorTo(0, 0);
this.selection.clearSelection();
this.$resetRowCache(0);
this.$deltas = [];
this.$deltasDoc = [];
this.$deltasFold = [];
this.getUndoManager().reset();
};
/**
* Returns the current [[Document `Document`]] as a string.
* @method toString
* @returns {String}
* @alias EditSession.getValue
*
**/
/**
* Returns the current [[Document `Document`]] as a string.
* @method getValue
* @returns {String}
* @alias EditSession.toString
**/
this.getValue =
this.toString = function() {
return this.doc.getValue();
};
/**
* Returns the string of the current selection.
**/
this.getSelection = function() {
return this.selection;
};
/**
* {:BackgroundTokenizer.getState}
* @param {Number} row The row to start at
*
* @related BackgroundTokenizer.getState
**/
this.getState = function(row) {
return this.bgTokenizer.getState(row);
};
/**
* Starts tokenizing at the row indicated. Returns a list of objects of the tokenized rows.
* @param {Number} row The row to start at
*
*
*
**/
this.getTokens = function(row) {
return this.bgTokenizer.getTokens(row);
};
/**
* Returns an object indicating the token at the current row. The object has two properties: `index` and `start`.
* @param {Number} row The row number to retrieve from
* @param {Number} column The column number to retrieve from
*
*
**/
this.getTokenAt = function(row, column) {
var tokens = this.bgTokenizer.getTokens(row);
var token, c = 0;
if (column == null) {
i = tokens.length - 1;
c = this.getLine(row).length;
} else {
for (var i = 0; i < tokens.length; i++) {
c += tokens[i].value.length;
if (c >= column)
break;
}
}
token = tokens[i];
if (!token)
return null;
token.index = i;
token.start = c - token.value.length;
return token;
};
/**
* Sets the undo manager.
* @param {UndoManager} undoManager The new undo manager
*
*
**/
this.setUndoManager = function(undoManager) {
this.$undoManager = undoManager;
this.$deltas = [];
this.$deltasDoc = [];
this.$deltasFold = [];
if (this.$informUndoManager)
this.$informUndoManager.cancel();
if (undoManager) {
var self = this;
this.$syncInformUndoManager = function() {
self.$informUndoManager.cancel();
if (self.$deltasFold.length) {
self.$deltas.push({
group: "fold",
deltas: self.$deltasFold
});
self.$deltasFold = [];
}
if (self.$deltasDoc.length) {
self.$deltas.push({
group: "doc",
deltas: self.$deltasDoc
});
self.$deltasDoc = [];
}
if (self.$deltas.length > 0) {
undoManager.execute({
action: "aceupdate",
args: [self.$deltas, self],
merge: self.mergeUndoDeltas
});
}
self.mergeUndoDeltas = false;
self.$deltas = [];
}
this.$informUndoManager = lang.delayedCall(this.$syncInformUndoManager);
}
};
/**
* starts a new group in undo history
**/
this.markUndoGroup = function() {
if (this.$syncInformUndoManager)
this.$syncInformUndoManager();
};
this.$defaultUndoManager = {
undo: function() {},
redo: function() {},
reset: function() {}
};
/**
* Returns the current undo manager.
**/
this.getUndoManager = function() {
return this.$undoManager || this.$defaultUndoManager;
};
/**
* Returns the current value for tabs. If the user is using soft tabs, this will be a series of spaces (defined by [[EditSession.getTabSize `getTabSize()`]]); otherwise it's simply `'\t'`.
**/
this.getTabString = function() {
if (this.getUseSoftTabs()) {
return lang.stringRepeat(" ", this.getTabSize());
} else {
return "\t";
}
};
/**
/**
* Pass `true` to enable the use of soft tabs. Soft tabs means you're using spaces instead of the tab character (`'\t'`).
* @param {Boolean} useSoftTabs Value indicating whether or not to use soft tabs
**/
this.setUseSoftTabs = function(val) {
this.setOption("useSoftTabs", val);
};
/**
* Returns `true` if soft tabs are being used, `false` otherwise.
* @returns {Boolean}
**/
this.getUseSoftTabs = function() {
// todo might need more general way for changing settings from mode, but this is ok for now
return this.$useSoftTabs && !this.$mode.$indentWithTabs;
};
/**
* Set the number of spaces that define a soft tab; for example, passing in `4` transforms the soft tabs to be equivalent to four spaces. This function also emits the `changeTabSize` event.
* @param {Number} tabSize The new tab size
**/
this.setTabSize = function(tabSize) {
this.setOption("tabSize", tabSize)
};
/**
* Returns the current tab size.
**/
this.getTabSize = function() {
return this.$tabSize;
};
/**
* Returns `true` if the character at the position is a soft tab.
* @param {Object} position The position to check
*
*
**/
this.isTabStop = function(position) {
return this.$useSoftTabs && (position.column % this.$tabSize == 0);
};
this.$overwrite = false;
/**
* Pass in `true` to enable overwrites in your session, or `false` to disable.
*
* If overwrites is enabled, any text you enter will type over any text after it. If the value of `overwrite` changes, this function also emites the `changeOverwrite` event.
*
* @param {Boolean} overwrite Defines wheter or not to set overwrites
*
*
**/
this.setOverwrite = function(overwrite) {
this.setOption("overwrite", overwrite)
};
/**
* Returns `true` if overwrites are enabled; `false` otherwise.
**/
this.getOverwrite = function() {
return this.$overwrite;
};
/**
* Sets the value of overwrite to the opposite of whatever it currently is.
**/
this.toggleOverwrite = function() {
this.setOverwrite(!this.$overwrite);
};
/**
* Adds `className` to the `row`, to be used for CSS stylings and whatnot.
* @param {Number} row The row number
* @param {String} className The class to add
*
*
**/
this.addGutterDecoration = function(row, className) {
if (!this.$decorations[row])
this.$decorations[row] = "";
this.$decorations[row] += " " + className;
this._signal("changeBreakpoint", {});
};
/**
* Removes `className` from the `row`.
* @param {Number} row The row number
* @param {String} className The class to add
*
*
**/
this.removeGutterDecoration = function(row, className) {
this.$decorations[row] = (this.$decorations[row] || "").replace(" " + className, "");
this._signal("changeBreakpoint", {});
};
/**
* Returns an array of numbers, indicating which rows have breakpoints.
* @returns {[Number]}
**/
this.getBreakpoints = function() {
return this.$breakpoints;
};
/**
* Sets a breakpoint on every row number given by `rows`. This function also emites the `'changeBreakpoint'` event.
* @param {Array} rows An array of row indices
*
*
*
**/
this.setBreakpoints = function(rows) {
this.$breakpoints = [];
for (var i=0; i<rows.length; i++) {
this.$breakpoints[rows[i]] = "ace_breakpoint";
}
this._signal("changeBreakpoint", {});
};
/**
* Removes all breakpoints on the rows. This function also emites the `'changeBreakpoint'` event.
**/
this.clearBreakpoints = function() {
this.$breakpoints = [];
this._signal("changeBreakpoint", {});
};
/**
* Sets a breakpoint on the row number given by `rows`. This function also emites the `'changeBreakpoint'` event.
* @param {Number} row A row index
* @param {String} className Class of the breakpoint
*
*
**/
this.setBreakpoint = function(row, className) {
if (className === undefined)
className = "ace_breakpoint";
if (className)
this.$breakpoints[row] = className;
else
delete this.$breakpoints[row];
this._signal("changeBreakpoint", {});
};
/**
* Removes a breakpoint on the row number given by `rows`. This function also emites the `'changeBreakpoint'` event.
* @param {Number} row A row index
*
*
**/
this.clearBreakpoint = function(row) {
delete this.$breakpoints[row];
this._signal("changeBreakpoint", {});
};
/**
* Adds a new marker to the given `Range`. If `inFront` is `true`, a front marker is defined, and the `'changeFrontMarker'` event fires; otherwise, the `'changeBackMarker'` event fires.
* @param {Range} range Define the range of the marker
* @param {String} clazz Set the CSS class for the marker
* @param {Function | String} type Identify the type of the marker
* @param {Boolean} inFront Set to `true` to establish a front marker
*
*
* @return {Number} The new marker id
**/
this.addMarker = function(range, clazz, type, inFront) {
var id = this.$markerId++;
var marker = {
range : range,
type : type || "line",
renderer: typeof type == "function" ? type : null,
clazz : clazz,
inFront: !!inFront,
id: id
}
if (inFront) {
this.$frontMarkers[id] = marker;
this._signal("changeFrontMarker")
} else {
this.$backMarkers[id] = marker;
this._signal("changeBackMarker")
}
return id;
};
/**
* Adds a dynamic marker to the session.
* @param {Object} marker object with update method
* @param {Boolean} inFront Set to `true` to establish a front marker
*
*
* @return {Object} The added marker
**/
this.addDynamicMarker = function(marker, inFront) {
if (!marker.update)
return;
var id = this.$markerId++;
marker.id = id;
marker.inFront = !!inFront;
if (inFront) {
this.$frontMarkers[id] = marker;
this._signal("changeFrontMarker")
} else {
this.$backMarkers[id] = marker;
this._signal("changeBackMarker")
}
return marker;
};
/**
* Removes the marker with the specified ID. If this marker was in front, the `'changeFrontMarker'` event is emitted. If the marker was in the back, the `'changeBackMarker'` event is emitted.
* @param {Number} markerId A number representing a marker
*
*
*
**/
this.removeMarker = function(markerId) {
var marker = this.$frontMarkers[markerId] || this.$backMarkers[markerId];
if (!marker)
return;
var markers = marker.inFront ? this.$frontMarkers : this.$backMarkers;
if (marker) {
delete (markers[markerId]);
this._signal(marker.inFront ? "changeFrontMarker" : "changeBackMarker");
}
};
/**
* Returns an array containing the IDs of all the markers, either front or back.
* @param {Boolean} inFront If `true`, indicates you only want front markers; `false` indicates only back markers
*
* @returns {Array}
**/
this.getMarkers = function(inFront) {
return inFront ? this.$frontMarkers : this.$backMarkers;
};
this.highlight = function(re) {
if (!this.$searchHighlight) {
var highlight = new SearchHighlight(null, "ace_selected-word", "text");
this.$searchHighlight = this.addDynamicMarker(highlight);
}
this.$searchHighlight.setRegexp(re);
}
// experimental
this.highlightLines = function(startRow, endRow, clazz, inFront) {
if (typeof endRow != "number") {
clazz = endRow;
endRow = startRow;
}
if (!clazz)
clazz = "ace_step";
var range = new Range(startRow, 0, endRow, Infinity);
range.id = this.addMarker(range, clazz, "fullLine", inFront);
return range;
};
/*
* Error:
* {
* row: 12,
* column: 2, //can be undefined
* text: "Missing argument",
* type: "error" // or "warning" or "info"
* }
*/
/**
* Sets annotations for the `EditSession`. This functions emits the `'changeAnnotation'` event.
* @param {Array} annotations A list of annotations
*
**/
this.setAnnotations = function(annotations) {
this.$annotations = annotations;
this._signal("changeAnnotation", {});
};
/**
* Returns the annotations for the `EditSession`.
* @returns {Array}
**/
this.getAnnotations = function() {
return this.$annotations || [];
};
/**
* Clears all the annotations for this session. This function also triggers the `'changeAnnotation'` event.
**/
this.clearAnnotations = function() {
this.setAnnotations([]);
};
/**
* If `text` contains either the newline (`\n`) or carriage-return ('\r') characters, `$autoNewLine` stores that value.
* @param {String} text A block of text
*
*
**/
this.$detectNewLine = function(text) {
var match = text.match(/^.*?(\r?\n)/m);
if (match) {
this.$autoNewLine = match[1];
} else {
this.$autoNewLine = "\n";
}
};
/**
* Given a starting row and column, this method returns the `Range` of the first word boundary it finds.
* @param {Number} row The row to start at
* @param {Number} column The column to start at
*
* @returns {Range}
**/
this.getWordRange = function(row, column) {
var line = this.getLine(row);
var inToken = false;
if (column > 0)
inToken = !!line.charAt(column - 1).match(this.tokenRe);
if (!inToken)
inToken = !!line.charAt(column).match(this.tokenRe);
if (inToken)
var re = this.tokenRe;
else if (/^\s+$/.test(line.slice(column-1, column+1)))
var re = /\s/;
else
var re = this.nonTokenRe;
var start = column;
if (start > 0) {
do {
start--;
}
while (start >= 0 && line.charAt(start).match(re));
start++;
}
var end = column;
while (end < line.length && line.charAt(end).match(re)) {
end++;
}
return new Range(row, start, row, end);
};
/**
* Gets the range of a word, including its right whitespace.
* @param {Number} row The row number to start from
* @param {Number} column The column number to start from
*
* @return {Range}
**/
this.getAWordRange = function(row, column) {
var wordRange = this.getWordRange(row, column);
var line = this.getLine(wordRange.end.row);
while (line.charAt(wordRange.end.column).match(/[ \t]/)) {
wordRange.end.column += 1;
}
return wordRange;
};
/**
* {:Document.setNewLineMode.desc}
* @param {String} newLineMode {:Document.setNewLineMode.param}
*
*
* @related Document.setNewLineMode
**/
this.setNewLineMode = function(newLineMode) {
this.doc.setNewLineMode(newLineMode);
};
/**
*
* Returns the current new line mode.
* @returns {String}
* @related Document.getNewLineMode
**/
this.getNewLineMode = function() {
return this.doc.getNewLineMode();
};
/**
* Identifies if you want to use a worker for the `EditSession`.
* @param {Boolean} useWorker Set to `true` to use a worker
*
**/
this.setUseWorker = function(useWorker) { this.setOption("useWorker", useWorker); };
/**
* Returns `true` if workers are being used.
**/
this.getUseWorker = function() { return this.$useWorker; };
/**
* Reloads all the tokens on the current session. This function calls [[BackgroundTokenizer.start `BackgroundTokenizer.start ()`]] to all the rows; it also emits the `'tokenizerUpdate'` event.
**/
this.onReloadTokenizer = function(e) {
var rows = e.data;
this.bgTokenizer.start(rows.first);
this._signal("tokenizerUpdate", e);
};
this.$modes = {};
/**
* Sets a new text mode for the `EditSession`. This method also emits the `'changeMode'` event. If a [[BackgroundTokenizer `BackgroundTokenizer`]] is set, the `'tokenizerUpdate'` event is also emitted.
* @param {TextMode} mode Set a new text mode
* @param {cb} optional callback
*
**/
this.$mode = null;
this.$modeId = null;
this.setMode = function(mode, cb) {
if (mode && typeof mode === "object") {
if (mode.getTokenizer)
return this.$onChangeMode(mode);
var options = mode;
var path = options.path;
} else {
path = mode || "ace/mode/text";
}
// this is needed if ace isn't on require path (e.g tests in node)
if (!this.$modes["ace/mode/text"])
this.$modes["ace/mode/text"] = new TextMode();
if (this.$modes[path] && !options) {
this.$onChangeMode(this.$modes[path]);
cb && cb();
return;
}
// load on demand
this.$modeId = path;
config.loadModule(["mode", path], function(m) {
if (this.$modeId !== path)
return cb && cb();
if (this.$modes[path] && !options)
return this.$onChangeMode(this.$modes[path]);
if (m && m.Mode) {
m = new m.Mode(options);
if (!options) {
this.$modes[path] = m;
m.$id = path;
}
this.$onChangeMode(m);
cb && cb();
}
}.bind(this));
// set mode to text until loading is finished
if (!this.$mode)
this.$onChangeMode(this.$modes["ace/mode/text"], true);
};
this.$onChangeMode = function(mode, $isPlaceholder) {
if (!$isPlaceholder)
this.$modeId = mode.$id;
if (this.$mode === mode)
return;
this.$mode = mode;
this.$stopWorker();
if (this.$useWorker)
this.$startWorker();
var tokenizer = mode.getTokenizer();
if(tokenizer.addEventListener !== undefined) {
var onReloadTokenizer = this.onReloadTokenizer.bind(this);
tokenizer.addEventListener("update", onReloadTokenizer);
}
if (!this.bgTokenizer) {
this.bgTokenizer = new BackgroundTokenizer(tokenizer);
var _self = this;
this.bgTokenizer.addEventListener("update", function(e) {
_self._signal("tokenizerUpdate", e);
});
} else {
this.bgTokenizer.setTokenizer(tokenizer);
}
this.bgTokenizer.setDocument(this.getDocument());
this.tokenRe = mode.tokenRe;
this.nonTokenRe = mode.nonTokenRe;
if (!$isPlaceholder) {
this.$options.wrapMethod.set.call(this, this.$wrapMethod);
this.$setFolding(mode.foldingRules);
this.bgTokenizer.start(0);
this._emit("changeMode");
}
};
this.$stopWorker = function() {
if (this.$worker)
this.$worker.terminate();
this.$worker = null;
};
this.$startWorker = function() {
if (typeof Worker !== "undefined" && !require.noWorker) {
try {
this.$worker = this.$mode.createWorker(this);
} catch (e) {
console.log("Could not load worker");
console.log(e);
this.$worker = null;
}
}
else
this.$worker = null;
};
/**
* Returns the current text mode.
* @returns {TextMode} The current text mode
**/
this.getMode = function() {
return this.$mode;
};
this.$scrollTop = 0;
/**
* This function sets the scroll top value. It also emits the `'changeScrollTop'` event.
* @param {Number} scrollTop The new scroll top value
*
**/
this.setScrollTop = function(scrollTop) {
// TODO: should we force integer lineheight instead? scrollTop = Math.round(scrollTop);
if (this.$scrollTop === scrollTop || isNaN(scrollTop))
return;