8 files changed, 660 insertions, 0 deletions

diff --git a/beamer/viewer/init.js b/beamer/viewer/init.js
new file mode 100644
index 0000000..9192834
--- /dev/null
+++ b/beamer/viewer/init.js
@@ -0,0 +1,67 @@
+/*
+ * Beamer Viewer, a web-based PDF presentation viewer
+ * Copyright (C) 2018 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
+ * 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 Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+"use strict";
+
+const params = function() {
+  const queryDict = {};
+  location.hash.substr(1).split("&").forEach(item => {
+    const pair = item.split("=");
+    queryDict[pair[0]] = pair[1];
+  });
+  return queryDict;
+}();
+
+function isController() {
+  return window.opener == null || window.opener.location.href != window.location.href;
+}
+
+function initCache() {
+  if (!navigator.serviceWorker) return;
+  navigator.serviceWorker.register("appcache.js");
+  
+  const offlineCapableIndicator = document.getElementById("offlineCapable");
+  offlineCapableIndicator.style.visibility = "visible";
+}
+
+function checkPopupPermission() {
+  const popup = window.open("popup.html");
+
+  if (popup == null) {
+    const warningMessage = document.getElementById("warning");
+    warningMessage.textContent = "A pop-up blocker is active. Make sure to allow pop-ups on this website.";
+  }
+}
+
+function init() {
+  initCache();
+  checkPopupPermission();
+
+  const viewer = new Viewer();
+
+  if ("file" in params)
+    viewer.load(params["file"]);
+}
+
+function load(file) {
+  location.hash = "file=" + file;
+  location.reload();
+}
+
+if (isController())
+  init();
diff --git a/beamer/viewer/presentation.js b/beamer/viewer/presentation.js
new file mode 100644
index 0000000..222a6d4
--- /dev/null
+++ b/beamer/viewer/presentation.js
@@ -0,0 +1,57 @@
+/*
+ * Beamer Viewer, a web-based PDF presentation viewer
+ * Copyright (C) 2018 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
+ * 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 Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+"use strict";
+
+class Presentation {
+  constructor(pdf) {
+    this.pdf = pdf;
+    this.currentPageIndex = 1;
+    this.stage = this._setupStage();
+  }
+
+  _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);
+  }
+
+  _onStageReady() {
+    this._setPage(this.currentPageIndex);
+  }
+
+  _onNext() {
+    if (this.currentPageIndex === this.pdf.numPages) return;
+    this._setPage(this.currentPageIndex + 1);
+  }
+
+  _onPrevious() {
+    if (this.currentPageIndex === 1) return;
+    this._setPage(this.currentPageIndex - 1);
+  }
+
+  _setPage(pageIndex) {
+    const self = this;
+    this.currentPageIndex = pageIndex;
+    this.pdf.getPage(this.currentPageIndex).then(function(page) {
+      self.stage.setPage(page);
+    })
+  }
+}
diff --git a/beamer/viewer/screen/screen.js b/beamer/viewer/screen/screen.js
new file mode 100644
index 0000000..c65ebc3
--- /dev/null
+++ b/beamer/viewer/screen/screen.js
@@ -0,0 +1,110 @@
+/*
+ * Beamer Viewer, a web-based PDF presentation viewer
+ * Copyright (C) 2018 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
+ * 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 Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+"use strict";
+
+class Screen {
+  constructor(window, secondary=false, withTimer=false) {
+    this.window = window;
+    this.secondary = secondary;
+
+    this.canvasId = "screen";
+    this.page = null;
+
+    this.timer = withTimer ? new Timer(window) : null;
+    this.pageTurnCount = 0;
+
+    this._registerListeners();
+    this._hideWelcomeScreen();
+  }
+
+  setPage(page) {
+    if (this.pageTurnCount++ === 1 && this.timer != null)
+      this.timer.start();
+
+    this.page = page;
+    this._repaint();
+  }
+
+  _registerListeners() {
+    const self = this;
+    this.window.addEventListener("resize", function() {
+      self._repaint();
+    });
+  }
+
+  _hideWelcomeScreen() {
+    const welcomeScreen = this.window.document.getElementById("welcomeScreen");
+    welcomeScreen.style.display = "none";
+  }
+
+  _getScreenSize(ratio) {
+    const windowRatio = this.window.innerWidth / this.window.innerHeight;
+    const horizontalScaleFactor = ratio / windowRatio;
+    return {
+      width: this.window.innerWidth * Math.min(horizontalScaleFactor, 1),
+      height: this.window.innerHeight / Math.max(horizontalScaleFactor, 1)
+    };
+  }
+
+  _getSlideSizeRatio() {
+    const viewport = this.page.getViewport(1);
+    return (viewport.width / 2) / viewport.height;
+  }
+
+  _newCanvas(width, height, xOffset, yOffset) {
+    const canvas = document.createElement("canvas");
+    canvas.width = width;
+    canvas.height = height;
+
+    const context = canvas.getContext("2d");
+    context.transform(1, 0, 0, 1, xOffset, yOffset);
+
+    return { canvas: canvas, context: context };
+  }
+
+  _showCanvas(canvas) {
+    const oldCanvas = this.window.document.getElementById(this.canvasId);
+    canvas.id = oldCanvas.id;
+    canvas.classList = oldCanvas.classList;
+    oldCanvas.replaceWith(canvas);
+  }
+
+  _render(canvas, context, scaleFactor) {
+    const renderContext = {
+      canvasContext: context,
+      viewport: this.page.getViewport(scaleFactor)
+    };
+
+    const self = this;
+    this.page.render(renderContext).then(function() {
+      self._showCanvas(canvas);
+    });
+  }
+
+  _repaint() {
+    if (this.page == null) return;
+
+    const screenRatio = this._getSlideSizeRatio();
+    const { width, height } = this._getScreenSize(screenRatio);