From 1d49c98cf210de45f8bd154de9fbeaecede09da2 Mon Sep 17 00:00:00 2001
From: Richard Schreiber <schreiber@rami.io>
Date: Thu, 29 Jun 2023 12:23:00 +0200
Subject: [PATCH] Widget: add lightbox for product images (Z#23123811) (#3439)

---
 src/pretix/presale/views/widget.py            | 16 ++--
 .../static/pretixpresale/js/widget/widget.js  | 60 +++++++++++-
 .../static/pretixpresale/scss/widget.scss     | 96 +++++++++++++++++++
 src/tests/presale/test_widget.py              |  6 ++
 4 files changed, 171 insertions(+), 7 deletions(-)

diff --git a/src/pretix/presale/views/widget.py b/src/pretix/presale/views/widget.py
index b1e1d5d389..1a4131ec88 100644
--- a/src/pretix/presale/views/widget.py
+++ b/src/pretix/presale/views/widget.py
@@ -212,11 +212,14 @@ def price_dict(item, price):
     }
 
 
-def get_picture(event, picture):
-    try:
-        thumb = get_thumbnail(picture.name, '60x60^').thumb.url
-    except:
-        logger.exception(f'Failed to create thumbnail of {picture.name}')
+def get_picture(event, picture, size=None):
+    thumb = None
+    if size:
+        try:
+            thumb = get_thumbnail(picture.name, size).thumb.url
+        except:
+            logger.exception(f'Failed to create thumbnail of {picture.name}')
+    if not thumb:
         thumb = default_storage.url(picture.name)
     return urljoin(build_absolute_uri(event, 'presale:event.index'), thumb)
 
@@ -264,7 +267,8 @@ class WidgetAPIProductList(EventListMixin, View):
                     {
                         'id': item.pk,
                         'name': str(item.name),
-                        'picture': get_picture(self.request.event, item.picture) if item.picture else None,
+                        'picture': get_picture(self.request.event, item.picture, '60x60^') if item.picture else None,
+                        'picture_fullsize': get_picture(self.request.event, item.picture) if item.picture else None,
                         'description': str(rich_text(item.description, safelinks=False)) if item.description else None,
                         'has_variations': item.has_variations,
                         'require_voucher': item.require_voucher,
diff --git a/src/pretix/static/pretixpresale/js/widget/widget.js b/src/pretix/static/pretixpresale/js/widget/widget.js
index edcc24c73f..84a0aa0cc5 100644
--- a/src/pretix/static/pretixpresale/js/widget/widget.js
+++ b/src/pretix/static/pretixpresale/js/widget/widget.js
@@ -450,7 +450,7 @@ Vue.component('item', {
 
         // Product description
         + '<div class="pretix-widget-item-info-col">'
-        + '<img :src="item.picture" v-if="item.picture" class="pretix-widget-item-picture">'
+        + '<a :href="item.picture_fullsize" v-if="item.picture" class="pretix-widget-item-picture-link" @click.prevent.stop="lightbox"><img :src="item.picture" class="pretix-widget-item-picture"></a>'
         + '<div class="pretix-widget-item-title-and-description">'
         + '<a v-if="item.has_variations && show_toggle" class="pretix-widget-item-title" :href="\'#\' + item.id + \'-variants\'"'
         + '   @click.prevent.stop="expand" role="button" tabindex="0"'
@@ -530,6 +530,12 @@ Vue.component('item', {
     methods: {
         expand: function () {
             this.expanded = !this.expanded;
+        },
+        lightbox: function () {
+            this.$root.overlay.lightbox = {
+                image: this.item.picture_fullsize,
+                description: this.item.name,
+            }
         }
     },
     computed: {
@@ -784,12 +790,44 @@ var shared_alert_fragment = (
     + '</div>'
 );
 
+var shared_lightbox_fragment = (
+    '<div :class="lightboxClasses" role="dialog" aria-modal="true" v-if="$root.lightbox" @click="lightboxClose">'
+        + '<div class="pretix-widget-lightbox-loading" v-if="$root.lightbox?.loading">'
+            + '<svg width="256" height="256" viewBox="0 0 1792 1792" xmlns="http://www.w3.org/2000/svg"><path class="pretix-widget-primary-color" d="M1152 896q0-106-75-181t-181-75-181 75-75 181 75 181 181 75 181-75 75-181zm512-109v222q0 12-8 23t-20 13l-185 28q-19 54-39 91 35 50 107 138 10 12 10 25t-9 23q-27 37-99 108t-94 71q-12 0-26-9l-138-108q-44 23-91 38-16 136-29 186-7 28-36 28h-222q-14 0-24.5-8.5t-11.5-21.5l-28-184q-49-16-90-37l-141 107q-10 9-25 9-14 0-25-11-126-114-165-168-7-10-7-23 0-12 8-23 15-21 51-66.5t54-70.5q-27-50-41-99l-183-27q-13-2-21-12.5t-8-23.5v-222q0-12 8-23t19-13l186-28q14-46 39-92-40-57-107-138-10-12-10-24 0-10 9-23 26-36 98.5-107.5t94.5-71.5q13 0 26 10l138 107q44-23 91-38 16-136 29-186 7-28 36-28h222q14 0 24.5 8.5t11.5 21.5l28 184q49 16 90 37l142-107q9-9 24-9 13 0 25 10 129 119 165 170 7 8 7 22 0 12-8 23-15 21-51 66.5t-54 70.5q26 50 41 98l183 28q13 2 21 12.5t8 23.5z"/></svg>'
+        + '</div>'
+        + '<div class="pretix-widget-lightbox-inner" @click.stop="">'
+            + '<figure class="pretix-widget-lightbox-image">'
+                + '<img :src="$root.lightbox.image" :alt="$root.lightbox.description" @load="lightboxLoaded" ref="lightboxImage">'
+                + '<figcaption v-if="$root.lightbox.description">{{$root.lightbox.description}}</figcaption>'
+            + '</figure>'
+            + '<button type="button" class="pretix-widget-lightbox-close" @click="lightboxClose" aria-label="'+strings.close+'">'
+                + '<svg height="16" viewBox="0 0 512 512" width="16" xmlns="http://www.w3.org/2000/svg"><path fill="#fff" d="M437.5,386.6L306.9,256l130.6-130.6c14.1-14.1,14.1-36.8,0-50.9c-14.1-14.1-36.8-14.1-50.9,0L256,205.1L125.4,74.5  c-14.1-14.1-36.8-14.1-50.9,0c-14.1,14.1-14.1,36.8,0,50.9L205.1,256L74.5,386.6c-14.1,14.1-14.1,36.8,0,50.9  c14.1,14.1,36.8,14.1,50.9,0L256,306.9l130.6,130.6c14.1,14.1,36.8,14.1,50.9,0C451.5,423.4,451.5,400.6,437.5,386.6z"/></svg>'
+            + '</button>'
+        + '</div>'
+    + '</div>'
+);
+
 Vue.component('pretix-overlay', {
     template: ('<div class="pretix-widget-overlay">'
         + shared_iframe_fragment
         + shared_alert_fragment
+        + shared_lightbox_fragment
         + '</div>'
     ),
+    watch: {
+        '$root.lightbox': function (newValue, oldValue) {
+            if (newValue) {
+                if (newValue.image != oldValue?.image) {
+                    this.$set(newValue, "loading", true);
+                }
+                if (!oldValue) {
+                    window.addEventListener('keyup', this.lightboxCloseOnKeyup);
+                }
+            } else {
+                window.removeEventListener('keyup', this.lightboxCloseOnKeyup);
+            }
+        }
+    },
     computed: {
         frameClasses: function () {
             return {
@@ -803,8 +841,27 @@ Vue.component('pretix-overlay', {
                 'pretix-widget-alert-shown': this.$root.error_message,
             };
         },
+        lightboxClasses: function () {
+            return {
+                'pretix-widget-lightbox-holder': true,
+                'pretix-widget-lightbox-shown': this.$root.lightbox,
+                'pretix-widget-lightbox-isloading': this.$root.lightbox?.loading,
+            };
+        },
     },
     methods: {
+        lightboxCloseOnKeyup: function (event) {
+            if (event.keyCode === 27) {
+                // abort on ESC-key
+                this.lightboxClose();
+            }
+        },
+        lightboxClose: function () {
+            this.$root.lightbox = null;
+        },
+        lightboxLoaded: function () {
+            this.$root.lightbox.loading = false;
+        },
         errorClose: function () {
             this.$root.error_message = null;
             this.$root.error_url_after = null;
@@ -1795,6 +1852,7 @@ var create_overlay = function (app) {
                 error_url_after: null,
                 error_url_after_new_tab: true,
                 error_message: null,
+                lightbox: null,
             }
         },
         methods: {
diff --git a/src/pretix/static/pretixpresale/scss/widget.scss b/src/pretix/static/pretixpresale/scss/widget.scss
index 63b0e7d0cf..e8257b6de6 100644
--- a/src/pretix/static/pretixpresale/scss/widget.scss
+++ b/src/pretix/static/pretixpresale/scss/widget.scss
@@ -768,6 +768,102 @@
   }
 }
 
+.pretix-widget-lightbox-holder {
+  position: fixed;
+  left: 0;
+  top: 0;
+  width: 100%;
+  height: 100%;
+  background: rgba(255, 255, 255, 0.8);
+  z-index: 16777271;
+  visibility: hidden;
+  opacity: 0;
+  transition: opacity 0.5s, visibility 0.5s;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+
+  .pretix-widget-lightbox-loading svg {
+    margin: 40px;
+    -webkit-animation: pretix-widget-spin 6s linear infinite;
+    -moz-animation: pretix-widget-spin 6s linear infinite;
+    animation: pretix-widget-spin 6s linear infinite;
+  }
+
+  &.pretix-widget-lightbox-shown {
+    visibility: visible;
+    opacity: 1;
+    transition: opacity 0.5s, visibility 0.5s;
+  }
+
+  .pretix-widget-lightbox-inner {
+    position: relative;
+    background: white;
+    border-radius: 5px 5px 5px 5px;
+    -moz-border-radius: 5px 5px 5px 5px;
+    -webkit-border-radius: 5px 5px 5px 5px;
+    box-shadow: 0 4px 18px 0 rgba(0, 0, 0, 0.1), 0 6px 20px 0 rgba(0, 0, 0, 0.09);
+    -webkit-box-shadow: 0 4px 18px 0 rgba(0, 0, 0, 0.1), 0 6px 20px 0 rgba(0, 0, 0, 0.09);
+    -moz-box-shadow: 0 4px 18px 0 rgba(0, 0, 0, 0.1), 0 6px 20px 0 rgba(0, 0, 0, 0.09);
+    box-sizing: border-box;
+    padding: 10px;
+    max-width: 90%;
+    max-height: 90%;
+  }
+  &.pretix-widget-lightbox-isloading .pretix-widget-lightbox-inner {
+    position: absolute;
+    width: 1px;
+    height: 1px;
+    padding: 0;
+    margin: -1px;
+    overflow: hidden;
+    clip: rect(0,0,0,0);
+    border: 0;
+  }
+
+  .pretix-widget-lightbox-image {
+    margin: 0;
+    padding: 0;
+    text-align: center;
+  }
+  .pretix-widget-lightbox-image img {
+    max-width: 80vw;
+    max-height: 80vh;
+    object-fit: scale-down;
+  }
+  .pretix-widget-lightbox-image figcaption {
+    margin: 0.5em 0 0;
+  }
+
+  .pretix-widget-lightbox-close {
+    position: absolute;
+    right: -12px;
+    top: -12px;
+    width: 24px;
+    height: 24px;
+    background: $brand-primary;
+    margin: 0;
+    border: none;
+    border-radius: 12px;
+    -moz-border-radius: 12px;
+    -webkit-border-radius: 12px;
+    text-align: center;
+    color: white;
+    font-weight: bold;
+    font-family: sans-serif;
+    text-decoration: none;
+    padding: 4px 0;
+    display: inline-block;
+    line-height: 16px;
+    cursor: pointer;
+  }
+
+  .pretix-widget-lightbox-close svg {
+    display: inline-block;
+    border: none;
+  }
+}
+
 .pretix-widget-primary-color {
   /* in SVG */
   fill: $brand-primary;
diff --git a/src/tests/presale/test_widget.py b/src/tests/presale/test_widget.py
index 075c003d9f..e04e51fd65 100644
--- a/src/tests/presale/test_widget.py
+++ b/src/tests/presale/test_widget.py
@@ -185,6 +185,7 @@ class WidgetCartTest(CartTestMixin, TestCase):
                             "max_price": None,
                             "price": {"gross": "23.00", "net": "19.33", "tax": "3.67", "name": "", "rate": "19.00", "includes_mixed_tax_rate": False},
                             "picture": None,
+                            "picture_fullsize": None,
                             "has_variations": 0,
                             "allow_waitinglist": True,
                             "mandatory_priced_addons": False,
@@ -204,6 +205,7 @@ class WidgetCartTest(CartTestMixin, TestCase):
                             "max_price": "14.00",
                             "price": None,
                             "picture": None,
+                            "picture_fullsize": None,
                             "has_variations": 4,
                             "allow_waitinglist": True,
                             "mandatory_priced_addons": False,
@@ -265,6 +267,7 @@ class WidgetCartTest(CartTestMixin, TestCase):
                         "price": {"gross": "23.00", "net": "19.33", "tax": "3.67", "name": "", "rate": "19.00",
                                   "includes_mixed_tax_rate": False},
                         "picture": None,
+                        "picture_fullsize": None,
                         "has_variations": 0,
                         "allow_waitinglist": True,
                         "mandatory_priced_addons": False,
@@ -310,6 +313,7 @@ class WidgetCartTest(CartTestMixin, TestCase):
                         "max_price": "14.00",
                         "price": None,
                         "picture": None,
+                        "picture_fullsize": None,
                         "has_variations": 4,
                         "allow_waitinglist": True,
                         "mandatory_priced_addons": False,
@@ -371,6 +375,7 @@ class WidgetCartTest(CartTestMixin, TestCase):
                             "max_price": None,
                             "price": {"gross": "23.00", "net": "19.33", "tax": "3.67", "name": "", "rate": "19.00", "includes_mixed_tax_rate": False},
                             "picture": None,
+                            "picture_fullsize": None,
                             "has_variations": 0,
                             "allow_waitinglist": True,
                             "mandatory_priced_addons": False,
@@ -425,6 +430,7 @@ class WidgetCartTest(CartTestMixin, TestCase):
                             'id': self.shirt.pk,
                             'name': 'T-Shirt',
                             'picture': None,
+                            "picture_fullsize": None,
                             'description': None,
                             'has_variations': 2,
                             "allow_waitinglist": True,