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/stage/actions.js | 121 +++++++++++++++++++++++++++++++++++++++++
 beamer/viewer/stage/stage.js   |  76 ++++++++++++++++++++++++++
 2 files changed, 197 insertions(+)
 create mode 100644 beamer/viewer/stage/actions.js
 create mode 100644 beamer/viewer/stage/stage.js

(limited to 'beamer/viewer/stage')

diff --git a/beamer/viewer/stage/actions.js b/beamer/viewer/stage/actions.js
new file mode 100644
index 0000000..601a441
--- /dev/null
+++ b/beamer/viewer/stage/actions.js
@@ -0,0 +1,121 @@
+/*
+ * 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 ActionEventHandler {
+  constructor(onNext, onPrevious) {
+    this.onNext = onNext;
+    this.onPrevious = onPrevious;
+  }
+}
+
+class KeyboardEventHandler extends ActionEventHandler {
+  register(window) {
+    const self = this;
+    window.addEventListener("keydown", function(event) {
+      self._onCommand(event);
+    })
+  }
+
+  _onCommand(keyboardEvent) {
+    switch (keyboardEvent.key) {
+      case "Enter":
+      case " ":
+      case "ArrowRight":
+      case "n":
+        return this.onNext();
+
+      case "ArrowLeft":
+      case "p":
+        return this.onPrevious();
+    }
+  }
+}
+
+class MouseClickEventHandler extends ActionEventHandler {
+  register(window) {
+    const self = this;
+    window.addEventListener("click", function(event) {
+      self._onCommand(event);
+    })
+  }
+
+  _onCommand(mouseEvent) {
+    this.onNext();
+  }
+}
+
+class TouchSwipeEventHandler extends ActionEventHandler {
+  constructor(onNext, onPrevious) {
+    super(onNext, onPrevious);
+    this.touchStartEvent = null;
+    this.touchMoveEvent = null;
+  }
+
+  register(window) {
+    const self = this;
+
+    window.addEventListener("touchstart", function(event) {
+      event.preventDefault();
+      self._onTouchStart(event);
+    });
+
+    window.addEventListener("touchmove", function(event) {
+      event.preventDefault();
+      self._onTouchMove(event);
+    });
+
+    window.addEventListener("touchend", function(event) {
+      event.preventDefault();
+      self._onTouchEnd();
+    });
+
+    window.addEventListener("touchcancel", function(event) {
+      event.preventDefault();
+    });
+  }
+
+  _onTouchStart(touchEvent) {
+    this.touchStartEvent = touchEvent;
+  }
+
+  _onTouchMove(touchEvent) {
+    this.touchMoveEvent = touchEvent;
+  }
+
+  _onTouchEnd() {
+    if (this.touchStartEvent == null || this.touchMoveEvent == null) return;
+
+    const touchDown = this._xCoordinate(this.touchStartEvent);
+    const touchUp = this._xCoordinate(this.touchMoveEvent);
+    const xDelta = touchDown - touchUp;
+
+    if (xDelta > 0)
+      this.onNext();
+    else if (xDelta < 0)
+      this.onPrevious();
+    
+    this.touchStartEvent = null;
+    this.touchMoveEvent = null;
+  }
+
+  _xCoordinate(touchEvent) {
+    return touchEvent.touches[0].clientX; // first finger
+  }
+}
diff --git a/beamer/viewer/stage/stage.js b/beamer/viewer/stage/stage.js
new file mode 100644
index 0000000..201f7b4
--- /dev/null
+++ b/beamer/viewer/stage/stage.js
@@ -0,0 +1,76 @@
+/*
+ * 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 Stage {
+  constructor(onReady, onNext, onPrevious) {
+    this.audienceScreen = null;
+    this.presenterScreen = null;
+
+    this.projector = window.open(window.location.href, "_blank", "toolbar=0,location=0,menubar=0");
+    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();
+      onReady();
+    });
+
+    this.eventHandlers = [
+      new KeyboardEventHandler(onNext, onPrevious),
+      new MouseClickEventHandler(onNext, onPrevious),
+      new TouchSwipeEventHandler(onNext, onPrevious)
+    ];
+
+    this._registerEventHandler(window);
+    this._registerEventHandler(this.projector);
+  }
+
+  setPage(page) {
+    this.audienceScreen.setPage(page);
+    this.presenterScreen.setPage(page);
+  }
+
+  _registerEventHandler(window) {
+    if (window == null) return;
+
+    this.eventHandlers.forEach(function(eventHandler) {
+      eventHandler.register(window);
+    });
+  }
+
+  _watchDetach() {
+    const self = this;
+    window.addEventListener("beforeunload", function() {
+      self._setMessage(self.projector, "Controller detached");
+    });
+
+    this.projector.addEventListener("beforeunload", function() {
+      self._setMessage(window, "Viewer detached");
+    });
+  }
+
+  _setMessage(window, message) {
+    const messageBar = window.document.getElementById("message");
+    messageBar.textContent = message;
+  }
+}
-- 
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