From d3ed15db29c36793c7ac2c28b44b52c86ca4a54f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20B=C3=B6hlke?= <ab@bcoding.de>
Date: Wed, 27 Jan 2016 15:09:49 +0700
Subject: [PATCH] Mediafile pdf presentation with angular-pdf and pdf.js (Fixes
 #1664).
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Thanks to André Böhlke for contribution core functionality!
Some additional template improvements by Emanuel.
---
 bower.json                                    |   5 +-
 gulpfile.js                                   |  10 +-
 openslides/core/static/js/core/base.js        |   1 +
 .../core/static/templates/projector.html      |   1 +
 openslides/mediafiles/serializers.py          |   9 +-
 .../static/js/mediafiles/projector.js         |  55 ++++++++-
 .../mediafiles/static/js/mediafiles/site.js   | 116 +++++++++++++++++-
 .../templates/mediafiles/mediafile-list.html  |  38 +++++-
 .../templates/mediafiles/slide_mediafile.html |   8 ++
 .../mediafiles/slide_mediafile_partial.html   |   1 +
 package.json                                  |   7 +-
 requirements_production.txt                   |   3 +-
 12 files changed, 239 insertions(+), 15 deletions(-)
 create mode 100644 openslides/mediafiles/static/templates/mediafiles/slide_mediafile.html
 create mode 100644 openslides/mediafiles/static/templates/mediafiles/slide_mediafile_partial.html

diff --git a/bower.json b/bower.json
index 29dd56e47..6045de0e0 100644
--- a/bower.json
+++ b/bower.json
@@ -31,9 +31,10 @@
     "ckeditor": "~4.5.4",
     "angular-ckeditor": "~1.0.0",
     "roboto-condensed": "~0.3.0",
-    "open-sans-fontface": "https://github.com/OpenSlides/open-sans.git#1.4.2.post1"
+    "open-sans-fontface": "https://github.com/OpenSlides/open-sans.git#1.4.2.post1",
+    "angular-pdf": "~1.3.0"
   },
   "resolutions": {
-    "angular": "^1.2.x"
+    "angular": ">=1.4.9 <1.5"
   }
 }
diff --git a/gulpfile.js b/gulpfile.js
index d33c060f9..62c6dc36e 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -21,6 +21,7 @@ var argv = require('yargs').argv,
     mainBowerFiles = require('main-bower-files'),
     minifyCSS = require('gulp-minify-css'),
     path = require('path'),
+    rename = require("gulp-rename"),
     through = require('through2'),
     uglify = require('gulp-uglify'),
     vsprintf = require('sprintf-js').vsprintf;
@@ -69,6 +70,13 @@ gulp.task('ckeditor', function () {
         .pipe(gulp.dest(path.join(output_directory, 'ckeditor')));
 });
 
+// Extra task only for pdfjs
+gulp.task('pdfjs', function () {
+    return gulp.src(path.join('bower_components', 'pdfjs-dist', 'build', 'pdf.worker.js'))
+        .pipe(rename(path.join('openslides-libs.worker.js')))
+        .pipe(gulp.dest(path.join(output_directory, 'js')));
+});
+
 // Compiles translation files (*.po) to *.json and saves them in the directory
 // openslides/static/i18n/.
 gulp.task('translations', function () {
@@ -80,7 +88,7 @@ gulp.task('translations', function () {
 });
 
 // Gulp default task. Runs all other tasks before.
-gulp.task('default', ['js-libs', 'css-libs', 'fonts-libs', 'ckeditor', 'translations'], function () {});
+gulp.task('default', ['js-libs', 'css-libs', 'fonts-libs', 'ckeditor', 'pdfjs', 'translations'], function () {});
 
 
 /**
diff --git a/openslides/core/static/js/core/base.js b/openslides/core/static/js/core/base.js
index c80722338..910924b27 100644
--- a/openslides/core/static/js/core/base.js
+++ b/openslides/core/static/js/core/base.js
@@ -10,6 +10,7 @@ angular.module('OpenSlidesApp.core', [
     'ngSanitize',  // TODO: only use this in functions that need it.
     'ui.bootstrap',
     'ui.tree',
+    'pdf'
 ])
 
 .config([
diff --git a/openslides/core/static/templates/projector.html b/openslides/core/static/templates/projector.html
index 10bc998be..5a21f5f13 100644
--- a/openslides/core/static/templates/projector.html
+++ b/openslides/core/static/templates/projector.html
@@ -7,6 +7,7 @@
 <link rel="stylesheet" href="static/css/projector.css">
 <link rel="icon" href="/static/img/favicon.png">
 <script src="static/js/openslides-libs.js"></script>
+<script src="static/js/openslides-libs.worker.js"></script>
 
 <style type="text/css">
   #header, #footer {
diff --git a/openslides/mediafiles/serializers.py b/openslides/mediafiles/serializers.py
index b86f6b2f4..ffc72db07 100644
--- a/openslides/mediafiles/serializers.py
+++ b/openslides/mediafiles/serializers.py
@@ -2,6 +2,7 @@ import mimetypes
 
 from django.conf import settings
 from django.db import models as dbmodels
+from PyPDF2 import PdfFileReader
 
 from ..utils.rest_api import FileField, ModelSerializer, SerializerMethodField
 from .models import Mediafile
@@ -17,10 +18,14 @@ class AngularCompatibleFileField(FileField):
     def to_representation(self, value):
         if value is None:
             return None
-        return {
+        filetype = mimetypes.guess_type(value.path)[0]
+        result = {
             'name': value.name,
-            'type': mimetypes.guess_type(value.path)[0]
+            'type': filetype
         }
+        if filetype == 'application/pdf':
+            result['pages'] = PdfFileReader(open(value.path, 'rb')).getNumPages()
+        return result
 
 
 class MediafileSerializer(ModelSerializer):
diff --git a/openslides/mediafiles/static/js/mediafiles/projector.js b/openslides/mediafiles/static/js/mediafiles/projector.js
index 846aa34ef..06110e3c1 100644
--- a/openslides/mediafiles/static/js/mediafiles/projector.js
+++ b/openslides/mediafiles/static/js/mediafiles/projector.js
@@ -2,6 +2,57 @@
 
 'use strict';
 
-angular.module('OpenSlidesApp.mediafiles.projector', ['OpenSlidesApp.mediafiles']);
+angular.module('OpenSlidesApp.mediafiles.projector', ['OpenSlidesApp.mediafiles'])
 
-}());
+.config([
+    'slidesProvider',
+    function(slidesProvider) {
+        slidesProvider.registerSlide('mediafiles/mediafile', {
+            template: 'static/templates/mediafiles/slide_mediafile.html'
+        });
+    }
+])
+
+.controller('SlideMediafileCtrl', [
+    '$scope',
+    'Mediafile',
+    function($scope, Mediafile) {
+        // load mediafile object
+        var mediafile = Mediafile.find($scope.element.id);
+        mediafile.then(function(mediafile) {
+            $scope.pdfName = mediafile.title;
+            $scope.pdfUrl = mediafile.mediafileUrl;
+        })
+        // get page from projector
+        $scope.page = $scope.element.page;
+        $scope.scroll = 0;
+
+        function updateScale() {
+            if($scope.element.pageFit) {
+                $scope.scale = 'page-fit';
+            } else {
+                $scope.scale = $scope.element.scale;
+            }
+        }
+
+        $scope.$watch(function() {
+            return $scope.element.scale;
+        }, updateScale);
+
+        updateScale();
+
+        $scope.getNavStyle = function(scroll) {
+            if (scroll > 100) {
+                return 'pdf-controls fixed';
+            } else {
+                return 'pdf-controls';
+            }
+        };
+
+        $scope.onLoad = function() {
+            $scope.loading = '';
+        };
+    }
+]);
+
+})();
diff --git a/openslides/mediafiles/static/js/mediafiles/site.js b/openslides/mediafiles/static/js/mediafiles/site.js
index 8536399d4..e50ccabd9 100644
--- a/openslides/mediafiles/static/js/mediafiles/site.js
+++ b/openslides/mediafiles/static/js/mediafiles/site.js
@@ -51,7 +51,8 @@ angular.module('OpenSlidesApp.mediafiles.site', ['ngFileUpload', 'OpenSlidesApp.
     'Mediafile',
     'MediafileForm',
     'User',
-    function($scope, $http, ngDialog, Mediafile, MediafileForm, User) {
+    'Projector',
+    function($scope, $http, ngDialog, Mediafile, MediafileForm, User, Projector) {
         Mediafile.bindAll({}, $scope, 'mediafiles');
         User.bindAll({}, $scope, 'users');
 
@@ -59,6 +60,20 @@ angular.module('OpenSlidesApp.mediafiles.site', ['ngFileUpload', 'OpenSlidesApp.
         $scope.sortColumn = 'title';
         $scope.filterPresent = '';
         $scope.reverse = false;
+
+        function updatePresentedMediafiles() {
+            var projectorElements = _.map(Projector.get(1).elements, function(element) { return element });
+            $scope.presentedMediafiles = _.filter(projectorElements, function (element) {
+                return element.name === 'mediafiles/mediafile';
+            });
+        }
+
+        $scope.$watch(function() {
+           return Projector.get(1).elements;
+        }, updatePresentedMediafiles);
+
+        updatePresentedMediafiles();
+
         // function to sort by clicked column
         $scope.toggleSort = function ( column ) {
             if ( $scope.sortColumn === column ) {
@@ -111,6 +126,105 @@ angular.module('OpenSlidesApp.mediafiles.site', ['ngFileUpload', 'OpenSlidesApp.
         $scope.delete = function (mediafile) {
             Mediafile.destroy(mediafile.id);
         };
+
+        // ** PDF presentation functions **/
+        // show document on projector
+        $scope.showPdf = function (mediafile) {
+            var postUrl,
+                data;
+            if ($scope.presentedMediafiles.length > 0) {
+                // update first mediafile, at the moment there should not be more
+                var uuid = $scope.presentedMediafiles[0].uuid;
+                postUrl = '/rest/core/projector/1/update_elements/';
+                data = {};
+                data[uuid] = {
+                    id: mediafile.id,
+                    numPages: mediafile.mediafile.pages,
+                    page: 1,
+                    pageFit: true,
+                    scale: 1,
+                    visible: true
+                };
+            } else {
+                postUrl = '/rest/core/projector/1/prune_elements/';
+                data = [{
+                    name: 'mediafiles/mediafile',
+                    id: mediafile.id,
+                    numPages: mediafile.mediafile.pages,
+                    visible: true,
+                    pageFit: true,
+                    scale: 1,
+                    page: 1
+                }];
+            }
+            $http.post(postUrl, data);
+        };
+
+        function sendMediafileCommand(data) {
+            var mediafileElement = getCurrentlyPresentedMediafile();
+            var updateData = _.extend({}, mediafileElement);
+            _.extend(updateData, data);
+            var postData = {};
+            postData[mediafileElement.uuid] = updateData;
+            $http.post('/rest/core/projector/1/update_elements/', postData);
+        }
+
+        function getCurrentlyPresentedMediafile() {
+            return $scope.presentedMediafiles[0];
+        }
+
+        $scope.mediafileGoPrevious = function () {
+            var mediafileElement = getCurrentlyPresentedMediafile();
+            if (mediafileElement.page > 1) {
+                sendMediafileCommand({
+                    page: parseInt(mediafileElement.page) - 1
+                });
+            }
+        };
+        $scope.mediafileGoNext = function () {
+            var mediafileElement = getCurrentlyPresentedMediafile();
+            if (mediafileElement.page < mediafileElement.numPages) {
+                sendMediafileCommand({
+                    page: parseInt(mediafileElement.page) + 1
+                });
+            }
+        };
+        $scope.mediafileZoomIn = function () {
+            var mediafileElement = getCurrentlyPresentedMediafile();
+            sendMediafileCommand({
+                pageFit: false,
+                scale: parseFloat(mediafileElement.scale) + 0.2
+            });
+        };
+        $scope.mediafileFit = function () {
+            sendMediafileCommand({
+                pageFit: true
+            });
+        };
+        $scope.mediafileZoomOut = function () {
+            var mediafileElement = getCurrentlyPresentedMediafile();
+            sendMediafileCommand({
+                pageFit: false,
+                scale: parseFloat(mediafileElement.scale) - 0.2
+            });
+        };
+        $scope.mediafileChangePage = function(pageNum) {
+            sendMediafileCommand({
+                pageToDisplay: pageNum
+            });
+        };
+        $scope.mediafileRotate = function () {
+            var rotation;
+            var currentRotation = $scope.mediafile.rotation;
+            if (currentRotation === 270) {
+                rotation = 0;
+            } else {
+                rotation = currentRotation + 90;
+            }
+            sendMediafileCommand({
+                rotation: rotation
+            });
+        };
     }
 ])
 
diff --git a/openslides/mediafiles/static/templates/mediafiles/mediafile-list.html b/openslides/mediafiles/static/templates/mediafiles/mediafile-list.html
index c2bb3d990..f9b07f3c9 100644
--- a/openslides/mediafiles/static/templates/mediafiles/mediafile-list.html
+++ b/openslides/mediafiles/static/templates/mediafiles/mediafile-list.html
@@ -60,6 +60,40 @@
     </div>
   </div>
 
+  <!-- mediafile pdf controls -->
+  <div os-perms="core.can_manage_projector" ng-show="presentedMediafiles.length">
+    <div ng-repeat="presentedMediafile in presentedMediafiles" class="well well-sm">
+      <h3 translate>PDF control elements</h3>
+      <!-- TODO: show filename / title of mediafile -->
+      <nav ng-class="getNavStyle(scroll)" class="form-inline">
+        <div class="btn-group">
+          <button class="btn btn-default" ng-click="mediafileGoPrevious()" title="{{ 'Previouse page' | translate }}">
+            <i class="fa fa-backward"></i>
+          </button>
+          <button class="btn btn-default" ng-click="mediafileGoNext()" title="{{ 'Next page' | translate }}">
+            <i class="fa fa-forward"></i>
+          </button>
+        </div>
+        <div class="btn-group">
+          <button class="btn btn-default" ng-click="mediafileZoomOut()" title="{{ 'Zoom out' | translate }}">
+            <i class="fa fa-search-minus"></i>
+          </button>
+          <button class="btn btn-default" ng-click="mediafileFit()" title="{{ 'Reset zoom' | translate }}">
+              100%
+          </button>
+          <button class="btn btn-default" ng-click="mediafileZoomIn()" title="{{ 'Zoom in' | translate }}">
+            <i class="fa fa-search-plus"></i>
+          </button>
+        </div>
+        <div class="input-group">
+          <span class="input-group-addon" translate>Page</span>
+          <input type="number" min=1 ng-model="presentedMediafile.page" class="form-control" style="width: 80px">
+          <span class="input-group-addon"><translate>of</translate> {{presentedMediafile.numPages}}</span>
+        </div>
+      </nav>
+    </div>
+  </div>
+
   <div class="spacer-top-lg italic">
     {{ mediafilesFiltered.length }} /
     {{ mediafiles.length }} {{ "files" | translate }}<span ng-if="(mediafiles|filter:{selected:true}).length > 0">,
@@ -110,14 +144,12 @@
           class="animate-item"
           ng-class="{ 'activeline': mediafile.isProjected(), 'selected': mediafile.selected }">
         <!-- projector column -->
-        <!-- TOOD: implement project pdf feature -->
         <td ng-show="!isDeleteMode"
             os-perms="core.can_manage_projector">
           <a class="btn btn-default btn-sm"
               ng-if="mediafile.mediafile.type == 'application/pdf'"
               ng-class="{ 'btn-primary': mediafile.isProjected() }"
-              ng-click="mediafile.project()"
-              ng-bootbox-alert="{{ 'Sorry, the function to project pdf files is not yet implemented.' | translate }}"
+              ng-click="showPdf(mediafile)"
               title="{{ 'Project mediafile' | translate }}">
             <i class="fa fa-video-camera"></i>
           </a>
diff --git a/openslides/mediafiles/static/templates/mediafiles/slide_mediafile.html b/openslides/mediafiles/static/templates/mediafiles/slide_mediafile.html
new file mode 100644
index 000000000..758788828
--- /dev/null
+++ b/openslides/mediafiles/static/templates/mediafiles/slide_mediafile.html
@@ -0,0 +1,8 @@
+<div ng-controller="SlideMediafileCtrl" class="content">
+    <ng-pdf template-url="/static/templates/mediafiles/slide_mediafile_partial.html"
+        scale="page-fit"
+        ng-attr-scale="{{ scale }}"
+        ng-attr-page="{{ page }}"
+        debug="true">
+    </ng-pdf>
+</div>
diff --git a/openslides/mediafiles/static/templates/mediafiles/slide_mediafile_partial.html b/openslides/mediafiles/static/templates/mediafiles/slide_mediafile_partial.html
new file mode 100644
index 000000000..78d538229
--- /dev/null
+++ b/openslides/mediafiles/static/templates/mediafiles/slide_mediafile_partial.html
@@ -0,0 +1 @@
+<canvas id="pdf-canvas" class="rotate0"></canvas>
diff --git a/package.json b/package.json
index 834d30d96..d3f696059 100644
--- a/package.json
+++ b/package.json
@@ -7,13 +7,14 @@
     "gulp-angular-gettext": "~2.1.0",
     "gulp-concat": "~2.6.0",
     "gulp-if": "~2.0.0",
+    "gulp-jshint": "~2.0.0",
     "gulp-minify-css": "~1.2.3",
+    "gulp-rename": "~1.2.2",
     "gulp-uglify": "~1.5.1",
     "main-bower-files": "~2.11.1",
-    "yargs": "~3.32.0",
     "po2json": "~0.4.1",
-    "gulp-jshint": "~2.0.0",
+    "sprintf-js": "~1.0.3",
     "through2": "~2.0.0",
-    "sprintf-js": "~1.0.3"
+    "yargs": "~3.32.0"
   }
 }
diff --git a/requirements_production.txt b/requirements_production.txt
index a20e23bab..4d23e7cb0 100644
--- a/requirements_production.txt
+++ b/requirements_production.txt
@@ -9,4 +9,5 @@ reportlab>=3.0,<3.3
 roman>=2.0,<2.1
 setuptools>=2.2,<20.0
 sockjs-tornado>=1.0,<1.1
-Whoosh>=2.7,<2.8
+Whoosh>=2.7.0,<2.8
+PyPDF2==1.25.1