5 files changed, 49 insertions, 68 deletions

diff --git a/beamer/viewer/presentation.js b/beamer/viewer/presentation.js
index fd03288..753027b 100644
--- a/beamer/viewer/presentation.js
+++ b/beamer/viewer/presentation.js
@@ -30,11 +30,11 @@ class Presentation {
   }
 
   _setupStage() {
-    const self = this;
-    const onStageReadyCallback = function() { self._onStageReady(); };
-    const onNextCallback = function() { self._onNext(); };
-    const onPreviousCallback = function() { self._onPrevious(); };
-    return new Stage(onStageReadyCallback, onNextCallback, onPreviousCallback);
+    return new Stage(
+      () => this._onStageReady(),
+      () => this._onNext(),
+      () => this._onPrevious(),
+    );
   }
 
   _onStageReady() {
@@ -52,10 +52,9 @@ class Presentation {
   }
 
   _setPage(pageIndex) {
-    const self = this;
     this.currentPageIndex = pageIndex;
-    this.pdf.getPage(this.currentPageIndex).then(function(page) {
-      self.stage.setPage(page);
-    })
+    this.pdf
+      .getPage(this.currentPageIndex)
+      .then(page => this.stage.setPage(page))
   }
 }
diff --git a/beamer/viewer/screen/screen.js b/beamer/viewer/screen/screen.js
index c65ebc3..7cfc54b 100644
--- a/beamer/viewer/screen/screen.js
+++ b/beamer/viewer/screen/screen.js
@@ -1,6 +1,6 @@
 /*
  * Beamer Viewer, a web-based PDF presentation viewer
- * Copyright (C) 2018 Pacien TRAN-GIRARD
+ * Copyright (C) 2018-2023 Pacien TRAN-GIRARD
  * 
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -42,10 +42,7 @@ class Screen {
   }
 
   _registerListeners() {
-    const self = this;
-    this.window.addEventListener("resize", function() {
-      self._repaint();
-    });
+    this.window.addEventListener("resize", () => this._repaint());
   }
 
   _hideWelcomeScreen() {
@@ -91,10 +88,9 @@ class Screen {
       viewport: this.page.getViewport(scaleFactor)
     };
 
-    const self = this;
-    this.page.render(renderContext).then(function() {
-      self._showCanvas(canvas);
-    });
+    this.page
+      .render(renderContext)
+      .then(() => this._showCanvas(canvas));
   }
 
   _repaint() {
diff --git a/beamer/viewer/stage/actions.js b/beamer/viewer/stage/actions.js
index 30634ae..47eda60 100644
--- a/beamer/viewer/stage/actions.js
+++ b/beamer/viewer/stage/actions.js
@@ -1,6 +1,6 @@
 /*
  * Beamer Viewer, a web-based PDF presentation viewer
- * Copyright (C) 2018 Pacien TRAN-GIRARD
+ * Copyright (C) 2018-2023 Pacien TRAN-GIRARD
  * 
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -27,10 +27,7 @@ class ActionEventHandler {
 
 class KeyboardEventHandler extends ActionEventHandler {
   register(window) {
-    const self = this;
-    window.addEventListener("keydown", function(event) {
-      self._onCommand(event);
-    })
+    window.addEventListener("keydown", event => this._onCommand(event));
   }
 
   _onCommand(keyboardEvent) {
@@ -52,10 +49,7 @@ class KeyboardEventHandler extends ActionEventHandler {
 
 class MouseClickEventHandler extends ActionEventHandler {
   register(window) {
-    const self = this;
-    window.addEventListener("click", function(event) {
-      self._onCommand(event);
-    })
+    window.addEventListener("click", event => this._onCommand(event));
   }
 
   _onCommand(mouseEvent) {
@@ -71,24 +65,22 @@ class TouchSwipeEventHandler extends ActionEventHandler {
   }
 
   register(window) {
-    const self = this;
-
-    window.addEventListener("touchstart", function(event) {
+    window.addEventListener("touchstart", event => {
       event.preventDefault();
-      self._onTouchStart(event);
+      this._onTouchStart(event);
     });
 
-    window.addEventListener("touchmove", function(event) {
+    window.addEventListener("touchmove", event => {
       event.preventDefault();
-      self._onTouchMove(event);
+      this._onTouchMove(event);
     });
 
-    window.addEventListener("touchend", function(event) {
+    window.addEventListener("touchend", event => {
       event.preventDefault();
-      self._onTouchEnd();
+      this._onTouchEnd();
     });
 
-    window.addEventListener("touchcancel", function(event) {
+    window.addEventListener("touchcancel", event => {
       event.preventDefault();
     });
   }
diff --git a/beamer/viewer/stage/stage.js b/beamer/viewer/stage/stage.js
index 3f1a5f5..4882c31 100644
--- a/beamer/viewer/stage/stage.js
+++ b/beamer/viewer/stage/stage.js
@@ -36,12 +36,11 @@ class Stage {
     if (this.projector == null)
       alert("Please allow pop-ups, then refresh this page.");
 
-    const self = this;
-    this.projector.addEventListener("load", function() {
-      self.audienceScreen = new Screen(self.projector, false, false);
-      self.presenterScreen = new Screen(window, true, true);
-      self._watchDetach();
-      self.onReady();
+    this.projector.addEventListener("load", () => {
+      this.audienceScreen = new Screen(this.projector, false, false);
+      this.presenterScreen = new Screen(window, true, true);
+      this._watchDetach();
+      this.onReady();
     });
 
     this._registerEventHandler(window);
@@ -56,20 +55,18 @@ class Stage {
   _registerEventHandler(window) {
     if (window == null) return;
 
-    this.eventHandlers.forEach(function(eventHandler) {
-      eventHandler.register(window);
-    });
+    this.eventHandlers
+      .forEach(eventHandler => eventHandler.register(window));
   }
 
   _watchDetach() {
-    const self = this;
-    window.addEventListener("beforeunload", function() {
-      self._setMessage(self.projector, "Controller detached");
-    });
+    window.addEventListener("beforeunload", () =>
+      this._setMessage(this.projector, "Controller detached")
+    );
 
-    this.projector.addEventListener("beforeunload", function() {
-      self._setMessage(window, "Viewer detached");
-    });
+    this.projector.addEventListener("beforeunload", () =>
+      this._setMessage(window, "Viewer detached")
+    );
   }
 
   _setMessage(window, message) {
diff --git a/beamer/viewer/viewer.js b/beamer/viewer/viewer.js
index d8d7668..a10e6de 100644
--- a/beamer/viewer/viewer.js
+++ b/beamer/viewer/viewer.js
@@ -35,10 +35,9 @@ class Viewer {
   }
 
   _preparePresentation(source) {
-    const self = this;
-    pdfjsLib.getDocument(source).then(function(pdf) {
-      self.presentation = new Presentation(pdf);
-    }).catch(function(error) {
+    pdfjsLib.getDocument(source).then(pdf => {
+      this.presentation = new Presentation(pdf);
+    }).catch(error => {
       console.error(error);
       window.alert("Error while loading presentation:\n\n" + error.message);
       window.location.href = window.location.pathname; // reload without "?file=..."
@@ -46,9 +45,8 @@ class Viewer {
   }
 
   _readFile(file) {
-    const self = this;
-    this.fileReader.onload = function() {
-      self._setPresentation(new Uint8Array(this.result));
+    this.fileReader.onload = () => {
+      this._setPresentation(new Uint8Array(this.result));