From 3fa27c054a2e66b038557801debfb39700194fd6 Mon Sep 17 00:00:00 2001
From: pacien
Date: Wed, 24 Oct 2018 05:03:45 +0200
Subject: Rename project

---
 beamer/viewer/presentation.js | 57 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 beamer/viewer/presentation.js

(limited to 'beamer/viewer/presentation.js')

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);
+    })
+  }
+}
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