1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/browser/metro/base/content/contenthandlers/SelectionHandler.js Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,616 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +let Ci = Components.interfaces;
1.9 +let Cc = Components.classes;
1.10 +
1.11 +dump("### SelectionHandler.js loaded\n");
1.12 +
1.13 +var SelectionHandler = {
1.14 + init: function init() {
1.15 + this.type = kContentSelector;
1.16 + this.snap = true;
1.17 + this.lastYPos = this.lastXPos = null;
1.18 + addMessageListener("Browser:SelectionStart", this);
1.19 + addMessageListener("Browser:SelectionAttach", this);
1.20 + addMessageListener("Browser:SelectionEnd", this);
1.21 + addMessageListener("Browser:SelectionMoveStart", this);
1.22 + addMessageListener("Browser:SelectionMove", this);
1.23 + addMessageListener("Browser:SelectionMoveEnd", this);
1.24 + addMessageListener("Browser:SelectionUpdate", this);
1.25 + addMessageListener("Browser:SelectionClose", this);
1.26 + addMessageListener("Browser:SelectionCopy", this);
1.27 + addMessageListener("Browser:SelectionDebug", this);
1.28 + addMessageListener("Browser:CaretAttach", this);
1.29 + addMessageListener("Browser:CaretMove", this);
1.30 + addMessageListener("Browser:CaretUpdate", this);
1.31 + addMessageListener("Browser:SelectionSwitchMode", this);
1.32 + addMessageListener("Browser:RepositionInfoRequest", this);
1.33 + addMessageListener("Browser:SelectionHandlerPing", this);
1.34 + addMessageListener("Browser:ResetLastPos", this);
1.35 + },
1.36 +
1.37 + shutdown: function shutdown() {
1.38 + removeMessageListener("Browser:SelectionStart", this);
1.39 + removeMessageListener("Browser:SelectionAttach", this);
1.40 + removeMessageListener("Browser:SelectionEnd", this);
1.41 + removeMessageListener("Browser:SelectionMoveStart", this);
1.42 + removeMessageListener("Browser:SelectionMove", this);
1.43 + removeMessageListener("Browser:SelectionMoveEnd", this);
1.44 + removeMessageListener("Browser:SelectionUpdate", this);
1.45 + removeMessageListener("Browser:SelectionClose", this);
1.46 + removeMessageListener("Browser:SelectionCopy", this);
1.47 + removeMessageListener("Browser:SelectionDebug", this);
1.48 + removeMessageListener("Browser:CaretAttach", this);
1.49 + removeMessageListener("Browser:CaretMove", this);
1.50 + removeMessageListener("Browser:CaretUpdate", this);
1.51 + removeMessageListener("Browser:SelectionSwitchMode", this);
1.52 + removeMessageListener("Browser:RepositionInfoRequest", this);
1.53 + removeMessageListener("Browser:SelectionHandlerPing", this);
1.54 + removeMessageListener("Browser:ResetLastPos", this);
1.55 + },
1.56 +
1.57 + sendAsync: function sendAsync(aMsg, aJson) {
1.58 + sendAsyncMessage(aMsg, aJson);
1.59 + },
1.60 +
1.61 + /*************************************************
1.62 + * Browser event handlers
1.63 + */
1.64 +
1.65 + /*
1.66 + * Selection start event handler
1.67 + */
1.68 + _onSelectionStart: function _onSelectionStart(aJson) {
1.69 + // Init content window information
1.70 + if (!this._initTargetInfo(aJson.xPos, aJson.yPos)) {
1.71 + this._onFail("failed to get target information");
1.72 + return;
1.73 + }
1.74 +
1.75 + // for context menu select command, which doesn't trigger
1.76 + // form input focus changes.
1.77 + if (aJson.setFocus && this._targetIsEditable) {
1.78 + this._targetElement.focus();
1.79 + }
1.80 +
1.81 + // Clear any existing selection from the document
1.82 + let selection = this._contentWindow.getSelection();
1.83 + selection.removeAllRanges();
1.84 +
1.85 + // Set our initial selection, aX and aY should be in client coordinates.
1.86 + let framePoint = this._clientPointToFramePoint({ xPos: aJson.xPos, yPos: aJson.yPos });
1.87 + if (!this._domWinUtils.selectAtPoint(framePoint.xPos, framePoint.yPos,
1.88 + Ci.nsIDOMWindowUtils.SELECT_WORDNOSPACE)) {
1.89 + this._onFail("failed to set selection at point");
1.90 + return;
1.91 + }
1.92 +
1.93 + // Update the position of our selection monocles
1.94 + this._updateSelectionUI("start", true, true);
1.95 + },
1.96 +
1.97 + _onSelectionAttach: function _onSelectionAttach(aX, aY) {
1.98 + // Init content window information
1.99 + if (!this._initTargetInfo(aX, aY)) {
1.100 + this._onFail("failed to get frame offset");
1.101 + return;
1.102 + }
1.103 +
1.104 + // Update the position of our selection monocles
1.105 + this._updateSelectionUI("start", true, true);
1.106 + },
1.107 +
1.108 + /*
1.109 + * Switch selection modes. Currently we only support switching
1.110 + * from "caret" to "selection".
1.111 + */
1.112 + _onSwitchMode: function _onSwitchMode(aMode, aMarker, aX, aY) {
1.113 + if (aMode != "selection") {
1.114 + this._onFail("unsupported mode switch");
1.115 + return;
1.116 + }
1.117 +
1.118 + // Sanity check to be sure we are initialized
1.119 + if (!this._targetElement) {
1.120 + this._onFail("not initialized");
1.121 + return;
1.122 + }
1.123 +
1.124 + // Only use selectAtPoint for editable content and avoid that for inputs,
1.125 + // as we can expand caret to selection manually more precisely. We can use
1.126 + // selectAtPoint for inputs too though, but only once bug 881938 is fully
1.127 + // resolved.
1.128 + if(Util.isEditableContent(this._targetElement)) {
1.129 + // Similar to _onSelectionStart - we need to create initial selection
1.130 + // but without the initialization bits.
1.131 + let framePoint = this._clientPointToFramePoint({ xPos: aX, yPos: aY });
1.132 + if (!this._domWinUtils.selectAtPoint(framePoint.xPos, framePoint.yPos,
1.133 + Ci.nsIDOMWindowUtils.SELECT_CHARACTER)) {
1.134 + this._onFail("failed to set selection at point");
1.135 + return;
1.136 + }
1.137 + } else if (this._targetElement.selectionStart == 0 || aMarker == "end") {
1.138 + // Expand caret forward or backward depending on direction
1.139 + this._targetElement.selectionEnd++;
1.140 + } else {
1.141 + this._targetElement.selectionStart--;
1.142 + }
1.143 +
1.144 + // We bail if things get out of sync here implying we missed a message.
1.145 + this._selectionMoveActive = true;
1.146 +
1.147 + // Update the position of the selection marker that is *not*
1.148 + // being dragged.
1.149 + this._updateSelectionUI("update", aMarker == "end", aMarker == "start");
1.150 + },
1.151 +
1.152 + /*
1.153 + * Selection monocle start move event handler
1.154 + */
1.155 + _onSelectionMoveStart: function _onSelectionMoveStart(aMsg) {
1.156 + if (!this._contentWindow) {
1.157 + this._onFail("_onSelectionMoveStart was called without proper view set up");
1.158 + return;
1.159 + }
1.160 +
1.161 + if (this._selectionMoveActive) {
1.162 + this._onFail("mouse is already down on drag start?");
1.163 + return;
1.164 + }
1.165 +
1.166 + // We bail if things get out of sync here implying we missed a message.
1.167 + this._selectionMoveActive = true;
1.168 +
1.169 + if (this._targetIsEditable) {
1.170 + // If we're coming out of an out-of-bounds scroll, the node the user is
1.171 + // trying to drag may be hidden (the monocle will be pegged to the edge
1.172 + // of the edit). Make sure the node the user wants to move is visible
1.173 + // and has focus.
1.174 + this._updateInputFocus(aMsg.change);
1.175 + }
1.176 +
1.177 + // Update the position of our selection monocles
1.178 + this._updateSelectionUI("update", true, true);
1.179 + },
1.180 +
1.181 + /*
1.182 + * Selection monocle move event handler
1.183 + */
1.184 + _onSelectionMove: function _onSelectionMove(aMsg) {
1.185 + if (!this._contentWindow) {
1.186 + this._onFail("_onSelectionMove was called without proper view set up");
1.187 + return;
1.188 + }
1.189 +
1.190 + if (!this._selectionMoveActive) {
1.191 + this._onFail("mouse isn't down for drag move?");
1.192 + return;
1.193 + }
1.194 +
1.195 + this._handleSelectionPoint(aMsg, false);
1.196 + },
1.197 +
1.198 + /*
1.199 + * Selection monocle move finished event handler
1.200 + */
1.201 + _onSelectionMoveEnd: function _onSelectionMoveComplete(aMsg) {
1.202 + if (!this._contentWindow) {
1.203 + this._onFail("_onSelectionMove was called without proper view set up");
1.204 + return;
1.205 + }
1.206 +
1.207 + if (!this._selectionMoveActive) {
1.208 + this._onFail("mouse isn't down for drag move?");
1.209 + return;
1.210 + }
1.211 +
1.212 + this._handleSelectionPoint(aMsg, true);
1.213 + this._selectionMoveActive = false;
1.214 +
1.215 + // _handleSelectionPoint may set a scroll timer, so this must
1.216 + // be reset after the last call.
1.217 + this._clearTimers();
1.218 +
1.219 + // Update the position of our selection monocles
1.220 + this._updateSelectionUI("end", true, true);
1.221 + },
1.222 +
1.223 + /*
1.224 + * _onCaretAttach - called by SelectionHelperUI when the user taps in a
1.225 + * form input. Initializes SelectionHandler, updates the location of the
1.226 + * caret, and messages back with current monocle position information.
1.227 + *
1.228 + * @param aX, aY tap location in client coordinates.
1.229 + */
1.230 + _onCaretAttach: function _onCaretAttach(aX, aY) {
1.231 + // Init content window information
1.232 + if (!this._initTargetInfo(aX, aY)) {
1.233 + this._onFail("failed to get target information");
1.234 + return;
1.235 + }
1.236 +
1.237 + // This should never happen, but we check to make sure
1.238 + if (!this._targetIsEditable) {
1.239 + this._onFail("Coordiates didn't find a text input element.");
1.240 + return;
1.241 + }
1.242 +
1.243 + // Locate and sanity check the caret position
1.244 + let selection = this._getSelection();
1.245 + if (!selection || !selection.isCollapsed) {
1.246 + this._onFail("No selection or selection is not collapsed.");
1.247 + return;
1.248 + }
1.249 +
1.250 + // Update the position of our selection monocles
1.251 + this._updateSelectionUI("caret", false, false, true);
1.252 + },
1.253 +
1.254 + /*
1.255 + * Selection copy event handler
1.256 + *
1.257 + * Check to see if the incoming click was on our selection rect.
1.258 + * if it was, copy to the clipboard. Incoming coordinates are
1.259 + * content values.
1.260 + */
1.261 + _onSelectionCopy: function _onSelectionCopy(aMsg) {
1.262 + let tap = {
1.263 + xPos: aMsg.xPos,
1.264 + yPos: aMsg.yPos,
1.265 + };
1.266 +
1.267 + let tapInSelection = (tap.xPos > this._cache.selection.left &&
1.268 + tap.xPos < this._cache.selection.right) &&
1.269 + (tap.yPos > this._cache.selection.top &&
1.270 + tap.yPos < this._cache.selection.bottom);
1.271 + // Util.dumpLn(tapInSelection,
1.272 + // tap.xPos, tap.yPos, "|", this._cache.selection.left,
1.273 + // this._cache.selection.right, this._cache.selection.top,
1.274 + // this._cache.selection.bottom);
1.275 + let success = false;
1.276 + let selectedText = this._getSelectedText();
1.277 + if (tapInSelection && selectedText.length) {
1.278 + let clipboard = Cc["@mozilla.org/widget/clipboardhelper;1"]
1.279 + .getService(Ci.nsIClipboardHelper);
1.280 + clipboard.copyString(selectedText, this._contentWindow.document);
1.281 + success = true;
1.282 + }
1.283 + sendSyncMessage("Content:SelectionCopied", { succeeded: success });
1.284 + },
1.285 +
1.286 + /*
1.287 + * Selection close event handler
1.288 + *
1.289 + * @param aClearSelection requests that selection be cleared.
1.290 + */
1.291 + _onSelectionClose: function _onSelectionClose(aClearSelection) {
1.292 + if (aClearSelection) {
1.293 + this._clearSelection();
1.294 + }
1.295 + this.closeSelection();
1.296 + },
1.297 +
1.298 + /*
1.299 + * Called any time SelectionHelperUI would like us to
1.300 + * recalculate the selection bounds.
1.301 + */
1.302 + _onSelectionUpdate: function _onSelectionUpdate(aMsg) {
1.303 + if (!this._contentWindow) {
1.304 + this._onFail("_onSelectionUpdate was called without proper view set up");
1.305 + return;
1.306 + }
1.307 +
1.308 + if (aMsg && aMsg.isInitiatedByAPZC) {
1.309 + let {offset: offset} = Content.getCurrentWindowAndOffset(
1.310 + this._targetCoordinates.x, this._targetCoordinates.y);
1.311 + this._contentOffset = offset;
1.312 + }
1.313 +
1.314 + // Update the position of our selection monocles
1.315 + this._updateSelectionUI("update", true, true);
1.316 + },
1.317 +
1.318 + /*
1.319 + * Called if for any reason we fail during the selection
1.320 + * process. Cancels the selection.
1.321 + */
1.322 + _onFail: function _onFail(aDbgMessage) {
1.323 + if (aDbgMessage && aDbgMessage.length > 0)
1.324 + Util.dumpLn(aDbgMessage);
1.325 + this.sendAsync("Content:SelectionFail");
1.326 + this._clearSelection();
1.327 + this.closeSelection();
1.328 + },
1.329 +
1.330 + /*
1.331 + * _repositionInfoRequest - fired at us by ContentAreaObserver when the
1.332 + * soft keyboard is being displayed. CAO wants to make a decision about
1.333 + * whether the browser deck needs repositioning.
1.334 + */
1.335 + _repositionInfoRequest: function _repositionInfoRequest(aJsonMsg) {
1.336 + let result = this._calcNewContentPosition(aJsonMsg.viewHeight);
1.337 +
1.338 + // no repositioning needed
1.339 + if (result == 0) {
1.340 + this.sendAsync("Content:RepositionInfoResponse", { reposition: false });
1.341 + return;
1.342 + }
1.343 +
1.344 + this.sendAsync("Content:RepositionInfoResponse", {
1.345 + reposition: true,
1.346 + raiseContent: result,
1.347 + });
1.348 + },
1.349 +
1.350 + _onPing: function _onPing(aId) {
1.351 + this.sendAsync("Content:SelectionHandlerPong", { id: aId });
1.352 + },
1.353 +
1.354 + onClickCoords: function (xPos, yPos) {
1.355 + this.lastXPos = xPos;
1.356 + this.lastYPos = yPos;
1.357 + },
1.358 +
1.359 + /*************************************************
1.360 + * Selection helpers
1.361 + */
1.362 +
1.363 + /*
1.364 + * _clearSelection
1.365 + *
1.366 + * Clear existing selection if it exists and reset our internla state.
1.367 + */
1.368 + _clearSelection: function _clearSelection() {
1.369 + this._clearTimers();
1.370 + if (this._contentWindow) {
1.371 + let selection = this._getSelection();
1.372 + if (selection)
1.373 + selection.removeAllRanges();
1.374 + } else {
1.375 + let selection = content.getSelection();
1.376 + if (selection)
1.377 + selection.removeAllRanges();
1.378 + }
1.379 + },
1.380 +
1.381 + /*
1.382 + * closeSelection
1.383 + *
1.384 + * Shuts SelectionHandler down.
1.385 + */
1.386 + closeSelection: function closeSelection() {
1.387 + this._clearTimers();
1.388 + this._cache = null;
1.389 + this._contentWindow = null;
1.390 + this._targetElement = null;
1.391 + this._selectionMoveActive = false;
1.392 + this._contentOffset = null;
1.393 + this._domWinUtils = null;
1.394 + this._targetIsEditable = false;
1.395 + this._targetCoordinates = null;
1.396 + sendSyncMessage("Content:HandlerShutdown", {});
1.397 + },
1.398 +
1.399 + /*
1.400 + * Find content within frames - cache the target nsIDOMWindow,
1.401 + * client coordinate offset, target element, and dom utils interface.
1.402 + */
1.403 + _initTargetInfo: function _initTargetInfo(aX, aY) {
1.404 + // getCurrentWindowAndOffset takes client coordinates
1.405 + let { element: element,
1.406 + contentWindow: contentWindow,
1.407 + offset: offset,
1.408 + utils: utils } =
1.409 + Content.getCurrentWindowAndOffset(aX, aY);
1.410 + if (!contentWindow) {
1.411 + return false;
1.412 + }
1.413 + this._targetElement = element;
1.414 + this._contentWindow = contentWindow;
1.415 + this._contentOffset = offset;
1.416 + this._domWinUtils = utils;
1.417 + this._targetIsEditable = Util.isEditable(this._targetElement);
1.418 + this._targetCoordinates = {
1.419 + x: aX,
1.420 + y: aY
1.421 + };
1.422 +
1.423 + return true;
1.424 + },
1.425 +
1.426 + /*
1.427 + * _calcNewContentPosition - calculates the distance the browser should be
1.428 + * raised to move the focused form input out of the way of the soft
1.429 + * keyboard.
1.430 + *
1.431 + * @param aNewViewHeight the new content view height
1.432 + * @return 0 if no positioning is required or a positive val equal to the
1.433 + * distance content should be raised to center the target element.
1.434 + */
1.435 + _calcNewContentPosition: function _calcNewContentPosition(aNewViewHeight) {
1.436 + // We have no target element but the keyboard is up
1.437 + // so lets not cover content that is below the keyboard
1.438 + if (!this._cache || !this._cache.element) {
1.439 + if (this.lastYPos != null && this.lastYPos > aNewViewHeight) {
1.440 + return Services.metro.keyboardHeight;
1.441 + }
1.442 + return 0;
1.443 + }
1.444 +
1.445 + let position = Util.centerElementInView(aNewViewHeight, this._cache.element);
1.446 + if (position !== undefined) {
1.447 + return position;
1.448 + }
1.449 +
1.450 + // Special case: we are dealing with an input that is taller than the
1.451 + // desired height of content. We need to center on the caret location.
1.452 + let rect =
1.453 + this._domWinUtils.sendQueryContentEvent(
1.454 + this._domWinUtils.QUERY_CARET_RECT,
1.455 + this._targetElement.selectionEnd,
1.456 + 0, 0, 0,
1.457 + this._domWinUtils.QUERY_CONTENT_FLAG_USE_XP_LINE_BREAK);
1.458 + if (!rect || !rect.succeeded) {
1.459 + Util.dumpLn("no caret was present, unexpected.");
1.460 + return 0;
1.461 + }
1.462 +
1.463 + // Note sendQueryContentEvent with QUERY_CARET_RECT is really buggy. If it
1.464 + // can't find the exact location of the caret position it will "guess".
1.465 + // Sometimes this can put the result in unexpected locations.
1.466 + let caretLocation = Math.max(Math.min(Math.round(rect.top + (rect.height * .5)),
1.467 + viewBottom), 0);
1.468 +
1.469 + // Caret is above the bottom of the new view bounds, no need to shift.
1.470 + if (caretLocation <= aNewViewHeight) {
1.471 + return 0;
1.472 + }
1.473 +
1.474 + // distance from the top of the keyboard down to the caret location
1.475 + return caretLocation - aNewViewHeight;
1.476 + },
1.477 +
1.478 + /*************************************************
1.479 + * Events
1.480 + */
1.481 +
1.482 + /*
1.483 + * Scroll + selection advancement timer when the monocle is
1.484 + * outside the bounds of an input control.
1.485 + */
1.486 + scrollTimerCallback: function scrollTimerCallback() {
1.487 + let result = SelectionHandler.updateTextEditSelection();
1.488 + // Update monocle position and speed if we've dragged off to one side
1.489 + if (result.trigger) {
1.490 + SelectionHandler._updateSelectionUI("update", result.start, result.end);
1.491 + }
1.492 + },
1.493 +
1.494 + receiveMessage: function sh_receiveMessage(aMessage) {
1.495 + if (this._debugEvents && aMessage.name != "Browser:SelectionMove") {
1.496 + Util.dumpLn("SelectionHandler:", aMessage.name);
1.497 + }
1.498 + let json = aMessage.json;
1.499 + switch (aMessage.name) {
1.500 + case "Browser:SelectionStart":
1.501 + this._onSelectionStart(json);
1.502 + break;
1.503 +
1.504 + case "Browser:SelectionAttach":
1.505 + this._onSelectionAttach(json.xPos, json.yPos);
1.506 + break;
1.507 +
1.508 + case "Browser:CaretAttach":
1.509 + this._onCaretAttach(json.xPos, json.yPos);
1.510 + break;
1.511 +
1.512 + case "Browser:CaretMove":
1.513 + this._onCaretMove(json.caret.xPos, json.caret.yPos);
1.514 + break;
1.515 +
1.516 + case "Browser:CaretUpdate":
1.517 + this._onCaretPositionUpdate(json.caret.xPos, json.caret.yPos);
1.518 + break;
1.519 +
1.520 + case "Browser:SelectionSwitchMode":
1.521 + this._onSwitchMode(json.newMode, json.change, json.xPos, json.yPos);
1.522 + break;
1.523 +
1.524 + case "Browser:SelectionClose":
1.525 + this._onSelectionClose(json.clearSelection);
1.526 + break;
1.527 +
1.528 + case "Browser:SelectionMoveStart":
1.529 + this._onSelectionMoveStart(json);
1.530 + break;
1.531 +
1.532 + case "Browser:SelectionMove":
1.533 + this._onSelectionMove(json);
1.534 + break;
1.535 +
1.536 + case "Browser:SelectionMoveEnd":
1.537 + this._onSelectionMoveEnd(json);
1.538 + break;
1.539 +
1.540 + case "Browser:SelectionCopy":
1.541 + this._onSelectionCopy(json);
1.542 + break;
1.543 +
1.544 + case "Browser:SelectionDebug":
1.545 + this._onSelectionDebug(json);
1.546 + break;
1.547 +
1.548 + case "Browser:SelectionUpdate":
1.549 + this._onSelectionUpdate(json);
1.550 + break;
1.551 +
1.552 + case "Browser:RepositionInfoRequest":
1.553 + // This message is sent simultaneously with a tap event.
1.554 + // Wait a bit to make sure we have the most up-to-date tap co-ordinates
1.555 + // before a call to _calcNewContentPosition() which accesses them.
1.556 + content.setTimeout (function () {
1.557 + SelectionHandler._repositionInfoRequest(json);
1.558 + }, 50);
1.559 + break;
1.560 +
1.561 + case "Browser:SelectionHandlerPing":
1.562 + this._onPing(json.id);
1.563 + break;
1.564 +
1.565 + case "Browser:ResetLastPos":
1.566 + this.onClickCoords(json.xPos, json.yPos);
1.567 + break;
1.568 + }
1.569 + },
1.570 +
1.571 + /*************************************************
1.572 + * Utilities
1.573 + */
1.574 +
1.575 + _getDocShell: function _getDocShell(aWindow) {
1.576 + if (aWindow == null)
1.577 + return null;
1.578 + return aWindow.QueryInterface(Ci.nsIInterfaceRequestor)
1.579 + .getInterface(Ci.nsIWebNavigation)
1.580 + .QueryInterface(Ci.nsIDocShell);
1.581 + },
1.582 +
1.583 + _getSelectedText: function _getSelectedText() {
1.584 + let selection = this._getSelection();
1.585 + if (selection)
1.586 + return selection.toString();
1.587 + return "";
1.588 + },
1.589 +
1.590 + _getSelection: function _getSelection() {
1.591 + if (this._targetElement instanceof Ci.nsIDOMNSEditableElement) {
1.592 + return this._targetElement
1.593 + .QueryInterface(Ci.nsIDOMNSEditableElement)
1.594 + .editor.selection;
1.595 + } else if (this._contentWindow)
1.596 + return this._contentWindow.getSelection();
1.597 + return null;
1.598 + },
1.599 +
1.600 + _getSelectController: function _getSelectController() {
1.601 + if (this._targetElement instanceof Ci.nsIDOMNSEditableElement) {
1.602 + return this._targetElement
1.603 + .QueryInterface(Ci.nsIDOMNSEditableElement)
1.604 + .editor.selectionController;
1.605 + } else {
1.606 + let docShell = this._getDocShell(this._contentWindow);
1.607 + if (docShell == null)
1.608 + return null;
1.609 + return docShell.QueryInterface(Ci.nsIInterfaceRequestor)
1.610 + .getInterface(Ci.nsISelectionDisplay)
1.611 + .QueryInterface(Ci.nsISelectionController);
1.612 + }
1.613 + },
1.614 +};
1.615 +this.SelectionHandler = SelectionHandler;
1.616 +
1.617 +SelectionHandler.__proto__ = new SelectionPrototype();
1.618 +SelectionHandler.init();
1.619 +
