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-rw-r--r--ext/bg/js/search-frontend.js1
-rw-r--r--ext/bg/js/search-query-parser.js2
-rw-r--r--ext/bg/search.html1
-rw-r--r--ext/fg/js/frontend.js342
-rw-r--r--ext/fg/js/popup-nested.js1
-rw-r--r--ext/manifest.json1
-rw-r--r--ext/mixed/js/text-scanner.js378
7 files changed, 405 insertions, 321 deletions
diff --git a/ext/bg/js/search-frontend.js b/ext/bg/js/search-frontend.js
index 6ba8467e..e21dc371 100644
--- a/ext/bg/js/search-frontend.js
+++ b/ext/bg/js/search-frontend.js
@@ -33,6 +33,7 @@ async function searchFrontendSetup() {
window.frontendInitializationData = {depth: 1, ignoreNodes, proxy: false};
const scriptSrcs = [
+ '/mixed/js/text-scanner.js',
'/fg/js/frontend-api-receiver.js',
'/fg/js/popup.js',
'/fg/js/popup-proxy-host.js',
diff --git a/ext/bg/js/search-query-parser.js b/ext/bg/js/search-query-parser.js
index 8dc2e30a..1c583bf1 100644
--- a/ext/bg/js/search-query-parser.js
+++ b/ext/bg/js/search-query-parser.js
@@ -62,7 +62,7 @@ class QueryParser {
const scanningOptions = this.search.options.scanning;
const scanningModifier = scanningOptions.modifier;
if (!(
- Frontend.isScanningModifierPressed(scanningModifier, e) ||
+ TextScanner.isScanningModifierPressed(scanningModifier, e) ||
(scanningOptions.middleMouse && DOM.isMouseButtonDown(e, 'auxiliary'))
)) {
return;
diff --git a/ext/bg/search.html b/ext/bg/search.html
index 58bb9ba8..7b4616da 100644
--- a/ext/bg/search.html
+++ b/ext/bg/search.html
@@ -74,6 +74,7 @@
<script src="/mixed/js/display.js"></script>
<script src="/mixed/js/japanese.js"></script>
<script src="/mixed/js/scroll.js"></script>
+ <script src="/mixed/js/text-scanner.js"></script>
<script src="/bg/js/search-query-parser.js"></script>
<script src="/bg/js/search.js"></script>
diff --git a/ext/fg/js/frontend.js b/ext/fg/js/frontend.js
index 9a1d507b..01f5c13d 100644
--- a/ext/fg/js/frontend.js
+++ b/ext/fg/js/frontend.js
@@ -17,29 +17,23 @@
*/
-class Frontend {
+class Frontend extends TextScanner {
constructor(popup, ignoreNodes) {
+ super(
+ window,
+ ignoreNodes,
+ [popup.container],
+ [(x, y) => this.popup.containsPoint(x, y)]
+ );
+
this.popup = popup;
- this.popupTimerPromise = null;
- this.textSourceCurrent = null;
- this.pendingLookup = false;
this.options = null;
- this.ignoreNodes = (Array.isArray(ignoreNodes) && ignoreNodes.length > 0 ? ignoreNodes.join(',') : null);
this.optionsContext = {
depth: popup.depth,
url: popup.url
};
- this.primaryTouchIdentifier = null;
- this.preventNextContextMenu = false;
- this.preventNextMouseDown = false;
- this.preventNextClick = false;
- this.preventScroll = false;
-
- this.enabled = false;
- this.eventListeners = [];
-
this.isPreparedPromiseResolve = null;
this.isPreparedPromise = new Promise((resolve) => { this.isPreparedPromiseResolve = resolve; });
@@ -71,162 +65,9 @@ class Frontend {
return this.isPreparedPromise;
}
- onMouseOver(e) {
- if (e.target === this.popup.container) {
- this.popupTimerClear();
- }
- }
-
- onMouseMove(e) {
- this.popupTimerClear();
-
- if (this.pendingLookup || DOM.isMouseButtonDown(e, 'primary')) {
- return;
- }
-
- const scanningOptions = this.options.scanning;
- const scanningModifier = scanningOptions.modifier;
- if (!(
- Frontend.isScanningModifierPressed(scanningModifier, e) ||
- (scanningOptions.middleMouse && DOM.isMouseButtonDown(e, 'auxiliary'))
- )) {
- return;
- }
-
- const search = async () => {
- if (scanningModifier === 'none') {
- if (!await this.popupTimerWait()) {
- // Aborted
- return;
- }
- }
-
- await this.searchAt(e.clientX, e.clientY, 'mouse');
- };
-
- search();
- }
-
- onMouseDown(e) {
- if (this.preventNextMouseDown) {
- this.preventNextMouseDown = false;
- this.preventNextClick = true;
- e.preventDefault();
- e.stopPropagation();
- return false;
- }
-
- if (e.button === 0) {
- this.popupTimerClear();
- this.searchClear(true);
- }
- }
-
- onMouseOut() {
- this.popupTimerClear();
- }
-
- onClick(e) {
- if (this.preventNextClick) {
- this.preventNextClick = false;
- e.preventDefault();
- e.stopPropagation();
- return false;
- }
- }
-
- onAuxClick() {
- this.preventNextContextMenu = false;
- }
-
- onContextMenu(e) {
- if (this.preventNextContextMenu) {
- this.preventNextContextMenu = false;
- e.preventDefault();
- e.stopPropagation();
- return false;
- }
- }
-
- onTouchStart(e) {
- if (this.primaryTouchIdentifier !== null || e.changedTouches.length === 0) {
- return;
- }
-
- this.preventScroll = false;
- this.preventNextContextMenu = false;
- this.preventNextMouseDown = false;
- this.preventNextClick = false;
-
- const primaryTouch = e.changedTouches[0];
- if (DOM.isPointInSelection(primaryTouch.clientX, primaryTouch.clientY, window.getSelection())) {
- return;
- }
-
- this.primaryTouchIdentifier = primaryTouch.identifier;
-
- if (this.pendingLookup) {
- return;
- }
-
- const textSourceCurrentPrevious = this.textSourceCurrent !== null ? this.textSourceCurrent.clone() : null;
-
- this.searchAt(primaryTouch.clientX, primaryTouch.clientY, 'touchStart')
- .then(() => {
- if (
- this.textSourceCurrent === null ||
- this.textSourceCurrent.equals(textSourceCurrentPrevious)
- ) {
- return;
- }
-
- this.preventScroll = true;
- this.preventNextContextMenu = true;
- this.preventNextMouseDown = true;
- });
- }
-
- onTouchEnd(e) {
- if (
- this.primaryTouchIdentifier === null ||
- this.getIndexOfTouch(e.changedTouches, this.primaryTouchIdentifier) < 0
- ) {
- return;
- }
-
- this.primaryTouchIdentifier = null;
- this.preventScroll = false;
- this.preventNextClick = false;
- // Don't revert context menu and mouse down prevention,
- // since these events can occur after the touch has ended.
- // this.preventNextContextMenu = false;
- // this.preventNextMouseDown = false;
- }
-
- onTouchCancel(e) {
- this.onTouchEnd(e);
- }
-
- onTouchMove(e) {
- if (!this.preventScroll || !e.cancelable || this.primaryTouchIdentifier === null) {
- return;
- }
-
- const touches = e.changedTouches;
- const index = this.getIndexOfTouch(touches, this.primaryTouchIdentifier);
- if (index < 0) {
- return;
- }
-
- const primaryTouch = touches[index];
- this.searchAt(primaryTouch.clientX, primaryTouch.clientY, 'touchMove');
-
- e.preventDefault(); // Disable scroll
- }
-
async onResize() {
- if (this.textSourceCurrent !== null && await this.popup.isVisibleAsync()) {
- const textSource = this.textSourceCurrent;
+ const textSource = this.textSourceCurrent;
+ if (textSource !== null && await this.popup.isVisibleAsync()) {
this.lastShowPromise = this.popup.showContent(
textSource.getRect(),
textSource.getWritingMode()
@@ -252,112 +93,24 @@ class Frontend {
}
}
- onError(error) {
- logError(error, false);
- }
-
- setEnabled(enabled) {
- if (enabled) {
- if (!this.enabled) {
- this.hookEvents();
- this.enabled = true;
- }
- } else {
- if (this.enabled) {
- this.clearEventListeners();
- this.enabled = false;
- }
- this.searchClear(false);
- }
- }
-
- hookEvents() {
- this.addEventListener(window, 'message', this.onWindowMessage.bind(this));
- this.addEventListener(window, 'mousedown', this.onMouseDown.bind(this));
- this.addEventListener(window, 'mousemove', this.onMouseMove.bind(this));
- this.addEventListener(window, 'mouseover', this.onMouseOver.bind(this));
- this.addEventListener(window, 'mouseout', this.onMouseOut.bind(this));
- this.addEventListener(window, 'resize', this.onResize.bind(this));
-
- if (this.options.scanning.touchInputEnabled) {
- this.addEventListener(window, 'click', this.onClick.bind(this));
- this.addEventListener(window, 'auxclick', this.onAuxClick.bind(this));
- this.addEventListener(window, 'touchstart', this.onTouchStart.bind(this));
- this.addEventListener(window, 'touchend', this.onTouchEnd.bind(this));
- this.addEventListener(window, 'touchcancel', this.onTouchCancel.bind(this));
- this.addEventListener(window, 'touchmove', this.onTouchMove.bind(this), {passive: false});
- this.addEventListener(window, 'contextmenu', this.onContextMenu.bind(this));
- }
- }
-
- addEventListener(node, type, listener, options) {
- node.addEventListener(type, listener, options);
- this.eventListeners.push([node, type, listener, options]);
- }
-
- clearEventListeners() {
- for (const [node, type, listener, options] of this.eventListeners) {
- node.removeEventListener(type, listener, options);
- }
- this.eventListeners = [];
+ getMouseEventListeners() {
+ return [
+ ...super.getMouseEventListeners(),
+ [window, 'message', this.onWindowMessage.bind(this)],
+ [window, 'resize', this.onResize.bind(this)]
+ ];
}
async updateOptions() {
this.options = await apiOptionsGet(this.getOptionsContext());
- this.setEnabled(this.options.general.enable);
await this.popup.setOptions(this.options);
+ this.setEnabled(this.options.general.enable);
}
- async popupTimerWait() {
- const delay = this.options.scanning.delay;
- const promise = promiseTimeout(delay, true);
- this.popupTimerPromise = promise;
- try {
- return await promise;
- } finally {
- if (this.popupTimerPromise === promise) {
- this.popupTimerPromise = null;
- }
- }
- }
-
- popupTimerClear() {
- if (this.popupTimerPromise !== null) {
- this.popupTimerPromise.resolve(false);
- this.popupTimerPromise = null;
- }
- }
-
- async searchAt(x, y, cause) {
- try {
- this.popupTimerClear();
-
- if (this.pendingLookup || await this.popup.containsPoint(x, y)) {
- return;
- }
-
- const textSource = docRangeFromPoint(x, y, this.options);
- if (this.textSourceCurrent !== null && this.textSourceCurrent.equals(textSource)) {
- return;
- }
-
- try {
- await this.searchSource(textSource, cause);
- } finally {
- if (textSource !== null) {
- textSource.cleanup();
- }
- }
- } catch (e) {
- this.onError(e);
- }
- }
-
- async searchSource(textSource, cause) {
+ async onSearchSource(textSource, cause) {
let results = null;
try {
- this.pendingLookup = true;
if (textSource !== null) {
results = (
await this.findTerms(textSource) ||
@@ -382,10 +135,8 @@ class Frontend {
}
} finally {
if (results === null && this.options.scanning.autoHideResults) {
- this.searchClear(true);
+ this.onSearchClear(true);
}
-
- this.pendingLookup = false;
}
return results;
@@ -400,11 +151,6 @@ class Frontend {
type,
{definitions, context: {sentence, url, focus, disableHistory: true}}
);
-
- this.textSourceCurrent = textSource;
- if (this.options.scanning.selectText) {
- textSource.select();
- }
}
async findTerms(textSource) {
@@ -433,65 +179,21 @@ class Frontend {
return {definitions, type: 'kanji'};
}
- searchClear(changeFocus) {
+ onSearchClear(changeFocus) {
this.popup.hide(changeFocus);
this.popup.clearAutoPlayTimer();
-
- if (this.textSourceCurrent !== null) {
- if (this.options.scanning.selectText) {
- this.textSourceCurrent.deselect();
- }
-
- this.textSourceCurrent = null;
- }
- }
-
- getIndexOfTouch(touchList, identifier) {
- for (const i in touchList) {
- const t = touchList[i];
- if (t.identifier === identifier) {
- return i;
- }
- }
- return -1;
- }
-
- setTextSourceScanLength(textSource, length) {
- textSource.setEndOffset(length);
- if (this.ignoreNodes === null || !textSource.range) {
- return;
- }
-
- length = textSource.text().length;
- while (textSource.range && length > 0) {
- const nodes = TextSourceRange.getNodesInRange(textSource.range);
- if (!TextSourceRange.anyNodeMatchesSelector(nodes, this.ignoreNodes)) {
- break;
- }
- --length;
- textSource.setEndOffset(length);
- }
+ super.onSearchClear(changeFocus);
}
getOptionsContext() {
this.optionsContext.url = this.popup.url;
return this.optionsContext;
}
-
- static isScanningModifierPressed(scanningModifier, mouseEvent) {
- switch (scanningModifier) {
- case 'alt': return mouseEvent.altKey;
- case 'ctrl': return mouseEvent.ctrlKey;
- case 'shift': return mouseEvent.shiftKey;
- case 'none': return true;
- default: return false;
- }
- }
}
Frontend.windowMessageHandlers = {
popupClose: (self) => {
- self.searchClear(true);
+ self.onSearchClear(true);
},
selectionCopy: () => {
diff --git a/ext/fg/js/popup-nested.js b/ext/fg/js/popup-nested.js
index 31cb1cda..3df469fe 100644
--- a/ext/fg/js/popup-nested.js
+++ b/ext/fg/js/popup-nested.js
@@ -41,6 +41,7 @@ async function popupNestedInitialize(id, depth, parentFrameId, url) {
window.frontendInitializationData = {id, depth, parentFrameId, ignoreNodes, url, proxy: true};
const scriptSrcs = [
+ '/mixed/js/text-scanner.js',
'/fg/js/frontend-api-sender.js',
'/fg/js/popup.js',
'/fg/js/popup-proxy.js',
diff --git a/ext/manifest.json b/ext/manifest.json
index 52bced23..225ca441 100644
--- a/ext/manifest.json
+++ b/ext/manifest.json
@@ -20,6 +20,7 @@
"js": [
"mixed/js/core.js",
"mixed/js/dom.js",
+ "mixed/js/text-scanner.js",
"fg/js/api.js",
"fg/js/document.js",
"fg/js/frontend-api-receiver.js",
diff --git a/ext/mixed/js/text-scanner.js b/ext/mixed/js/text-scanner.js
new file mode 100644
index 00000000..ac5d68d1
--- /dev/null
+++ b/ext/mixed/js/text-scanner.js
@@ -0,0 +1,378 @@
+/*
+ * Copyright (C) 2019 Alex Yatskov <alex@foosoft.net>
+ * Author: Alex Yatskov <alex@foosoft.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+class TextScanner {
+ constructor(node, ignoreNodes, ignoreElements, ignorePoints) {
+ this.node = node;
+ this.ignoreNodes = (Array.isArray(ignoreNodes) && ignoreNodes.length > 0 ? ignoreNodes.join(',') : null);
+ this.ignoreElements = ignoreElements;
+ this.ignorePoints = ignorePoints;
+
+ this.scanTimerPromise = null;
+ this.textSourceCurrent = null;
+ this.pendingLookup = false;
+ this.options = null;
+
+ this.enabled = false;
+ this.eventListeners = [];
+
+ this.primaryTouchIdentifier = null;
+ this.preventNextContextMenu = false;
+ this.preventNextMouseDown = false;
+ this.preventNextClick = false;
+ this.preventScroll = false;
+ }
+
+ onMouseOver(e) {
+ if (this.ignoreElements.includes(e.target)) {
+ this.scanTimerClear();
+ }
+ }
+
+ onMouseMove(e) {
+ this.scanTimerClear();
+
+ if (this.pendingLookup || DOM.isMouseButtonDown(e, 'primary')) {
+ return;
+ }
+
+ const scanningOptions = this.options.scanning;
+ const scanningModifier = scanningOptions.modifier;
+ if (!(
+ TextScanner.isScanningModifierPressed(scanningModifier, e) ||
+ (scanningOptions.middleMouse && DOM.isMouseButtonDown(e, 'auxiliary'))
+ )) {
+ return;
+ }
+
+ const search = async () => {
+ if (scanningModifier === 'none') {
+ if (!await this.scanTimerWait()) {
+ // Aborted
+ return;
+ }
+ }
+
+ await this.searchAt(e.clientX, e.clientY, 'mouse');
+ };
+
+ search();
+ }
+
+ onMouseDown(e) {
+ if (this.preventNextMouseDown) {
+ this.preventNextMouseDown = false;
+ this.preventNextClick = true;
+ e.preventDefault();
+ e.stopPropagation();
+ return false;
+ }
+
+ if (DOM.isMouseButtonDown(e, 'primary')) {
+ this.scanTimerClear();
+ this.onSearchClear(true);
+ }
+ }
+
+ onMouseOut() {
+ this.scanTimerClear();
+ }
+
+ onClick(e) {
+ if (this.preventNextClick) {
+ this.preventNextClick = false;
+ e.preventDefault();
+ e.stopPropagation();
+ return false;
+ }
+ }
+
+ onAuxClick() {
+ this.preventNextContextMenu = false;
+ }
+
+ onContextMenu(e) {
+ if (this.preventNextContextMenu) {
+ this.preventNextContextMenu = false;
+ e.preventDefault();
+ e.stopPropagation();
+ return false;
+ }
+ }
+
+ onTouchStart(e) {
+ if (this.primaryTouchIdentifier !== null || e.changedTouches.length === 0) {
+ return;
+ }
+
+ this.preventScroll = false;
+ this.preventNextContextMenu = false;
+ this.preventNextMouseDown = false;
+ this.preventNextClick = false;
+
+ const primaryTouch = e.changedTouches[0];
+ if (DOM.isPointInSelection(primaryTouch.clientX, primaryTouch.clientY, this.node.getSelection())) {
+ return;
+ }
+
+ this.primaryTouchIdentifier = primaryTouch.identifier;
+
+ if (this.pendingLookup) {
+ return;
+ }
+
+ const textSourceCurrentPrevious = this.textSourceCurrent !== null ? this.textSourceCurrent.clone() : null;
+
+ this.searchAt(primaryTouch.clientX, primaryTouch.clientY, 'touchStart')
+ .then(() => {
+ if (
+ this.textSourceCurrent === null ||
+ this.textSourceCurrent.equals(textSourceCurrentPrevious)
+ ) {
+ return;
+ }
+
+ this.preventScroll = true;
+ this.preventNextContextMenu = true;
+ this.preventNextMouseDown = true;
+ });
+ }
+
+ onTouchEnd(e) {
+ if (
+ this.primaryTouchIdentifier === null ||
+ TextScanner.getIndexOfTouch(e.changedTouches, this.primaryTouchIdentifier) < 0
+ ) {
+ return;
+ }
+
+ this.primaryTouchIdentifier = null;
+ this.preventScroll = false;
+ this.preventNextClick = false;
+ // Don't revert context menu and mouse down prevention,
+ // since these events can occur after the touch has ended.
+ // this.preventNextContextMenu = false;
+ // this.preventNextMouseDown = false;
+ }
+
+ onTouchCancel(e) {
+ this.onTouchEnd(e);
+ }
+
+ onTouchMove(e) {
+ if (!this.preventScroll || !e.cancelable || this.primaryTouchIdentifier === null) {
+ return;
+ }
+
+ const touches = e.changedTouches;
+ const index = TextScanner.getIndexOfTouch(touches, this.primaryTouchIdentifier);
+ if (index < 0) {
+ return;
+ }
+
+ const primaryTouch = touches[index];
+ this.searchAt(primaryTouch.clientX, primaryTouch.clientY, 'touchMove');
+
+ e.preventDefault(); // Disable scroll
+ }
+
+ async onSearchSource(_textSource, _cause) {
+ throw new Error('Override me');
+ }
+
+ onError(error) {
+ logError(error, false);
+ }
+
+ async scanTimerWait() {
+ const delay = this.options.scanning.delay;
+ const promise = promiseTimeout(delay, true);
+ this.scanTimerPromise = promise;
+ try {
+ return await promise;
+ } finally {
+ if (this.scanTimerPromise === promise) {
+ this.scanTimerPromise = null;
+ }
+ }
+ }
+
+ scanTimerClear() {
+ if (this.scanTimerPromise !== null) {
+ this.scanTimerPromise.resolve(false);
+ this.scanTimerPromise = null;
+ }
+ }
+
+ setEnabled(enabled) {
+ if (enabled) {
+ if (!this.enabled) {
+ this.hookEvents();
+ this.enabled = true;
+ }
+ } else {
+ if (this.enabled) {
+ this.clearEventListeners();
+ this.enabled = false;
+ }
+ this.onSearchClear(false);
+ }
+ }
+
+ hookEvents() {
+ let eventListeners = this.getMouseEventListeners();
+ if (this.options.scanning.touchInputEnabled) {
+ eventListeners = eventListeners.concat(this.getTouchEventListeners());
+ }
+
+ for (const [node, type, listener, options] of eventListeners) {
+ this.addEventListener(node, type, listener, options);
+ }
+ }
+
+ getMouseEventListeners() {
+ return [
+ [this.node, 'mousedown', this.onMouseDown.bind(this)],
+ [this.node, 'mousemove', this.onMouseMove.bind(this)],
+ [this.node, 'mouseover', this.onMouseOver.bind(this)],
+ [this.node, 'mouseout', this.onMouseOut.bind(this)]
+ ];
+ }
+
+ getTouchEventListeners() {
+ return [
+ [this.node, 'click', this.onClick.bind(this)],
+ [this.node, 'auxclick', this.onAuxClick.bind(this)],
+ [this.node, 'touchstart', this.onTouchStart.bind(this)],
+ [this.node, 'touchend', this.onTouchEnd.bind(this)],
+ [this.node, 'touchcancel', this.onTouchCancel.bind(this)],
+ [this.node, 'touchmove', this.onTouchMove.bind(this), {passive: false}],
+ [this.node, 'contextmenu', this.onContextMenu.bind(this)]
+ ];
+ }
+
+ addEventListener(node, type, listener, options) {
+ node.addEventListener(type, listener, options);
+ this.eventListeners.push([node, type, listener, options]);
+ }
+
+ clearEventListeners() {
+ for (const [node, type, listener, options] of this.eventListeners) {
+ node.removeEventListener(type, listener, options);
+ }
+ this.eventListeners = [];
+ }
+
+ setOptions(options) {
+ this.options = options;
+ }
+
+ async searchAt(x, y, cause) {
+ try {
+ this.scanTimerClear();
+
+ if (this.pendingLookup) {
+ return;
+ }
+
+ for (const ignorePointFn of this.ignorePoints) {
+ if (await ignorePointFn(x, y)) {
+ return;
+ }
+ }
+
+ const textSource = docRangeFromPoint(x, y, this.options);
+ if (this.textSourceCurrent !== null && this.textSourceCurrent.equals(textSource)) {
+ return;
+ }
+
+ try {
+ this.pendingLookup = true;
+ const result = await this.onSearchSource(textSource, cause);
+ if (result !== null) {
+ this.textSourceCurrent = textSource;
+ if (this.options.scanning.selectText) {
+ textSource.select();
+ }
+ }
+ this.pendingLookup = false;
+ } finally {
+ if (textSource !== null) {
+ textSource.cleanup();
+ }
+ }
+ } catch (e) {
+ this.onError(e);
+ }
+ }
+
+ setTextSourceScanLength(textSource, length) {
+ textSource.setEndOffset(length);
+ if (this.ignoreNodes === null || !textSource.range) {
+ return;
+ }
+
+ length = textSource.text().length;
+ while (textSource.range && length > 0) {
+ const nodes = TextSourceRange.getNodesInRange(textSource.range);
+ if (!TextSourceRange.anyNodeMatchesSelector(nodes, this.ignoreNodes)) {
+ break;
+ }
+ --length;
+ textSource.setEndOffset(length);
+ }
+ }
+
+ onSearchClear(_) {
+ if (this.textSourceCurrent !== null) {
+ if (this.options.scanning.selectText) {
+ this.textSourceCurrent.deselect();
+ }
+ this.textSourceCurrent = null;
+ }
+ }
+
+ getCurrentTextSource() {
+ return this.textSourceCurrent;
+ }
+
+ setCurrentTextSource(textSource) {
+ return this.textSourceCurrent = textSource;
+ }
+
+ static isScanningModifierPressed(scanningModifier, mouseEvent) {
+ switch (scanningModifier) {
+ case 'alt': return mouseEvent.altKey;
+ case 'ctrl': return mouseEvent.ctrlKey;
+ case 'shift': return mouseEvent.shiftKey;
+ case 'none': return true;
+ default: return false;
+ }
+ }
+
+ static getIndexOfTouch(touchList, identifier) {
+ for (const i in touchList) {
+ const t = touchList[i];
+ if (t.identifier === identifier) {
+ return i;
+ }
+ }
+ return -1;
+ }
+}