Add the photo_clipboard feature with localStorage.

photo_card objects now have a checkbox which adds them
to the clipboard. No pasting or other operations yet.

frontends/etiquette_flask/static/common.css

@@ -130,26 +130,33 @@ is hovered over.
     display:inline;
 }
 
+.photo_card
+{
+    background-color: #ffffd4;
+}
 .photo_card_list
 {
     display: grid;
-    grid-template-columns: 1fr auto;
+    grid-template-columns: auto 1fr auto;
     grid-template-rows: auto;
     grid-template-areas:
-        "filename metadata";
+        "checkbox filename metadata";
 
     max-width: 800px;
     margin: 8px;
     padding: 4px;
-
-    background-color: #ffffd4;
 }
 .photo_card_list:hover
 {
     box-shadow: 2px 2px 5px 0px rgba(0,0,0,0.25);
 }
+.photo_card_list .photo_card_selector_checkbox
+{
+    grid-area: checkbox;
+}
 .photo_card_grid
 {
+    position: relative;
     display: inline-grid;
     grid-template-columns: auto auto;
     grid-template-rows: auto 1fr auto;
@@ -165,8 +172,12 @@ is hovered over.
 
     border-radius: 8px;
     box-shadow: 2px 2px 5px 0px rgba(0,0,0,0.25);
-
-    background-color: #ffffd4;
+}
+.photo_card_grid .photo_card_selector_checkbox
+{
+    position:absolute;
+    left:5px;
+    top:5px;
 }
 .photo_card_thumbnail
 {
@@ -187,7 +198,6 @@ is hovered over.
     The min-width:100% + width:0 prevent the info div from controlling
     card size, so we can prioritize the thumbnail instead.
     */
-    align-self: start;
     justify-self: start;
     grid-area: filename;
 
@@ -202,6 +212,14 @@ is hovered over.
 
     font-size: 12.8px;
 }
+.photo_card_grid .photo_card_filename
+{
+    align-self: start;
+}
+.photo_card_list .photo_card_filename
+{
+    align-self: center;
+}
 .photo_card_filename:hover
 {
     overflow: visible;

frontends/etiquette_flask/static/photoclipboard.js

@@ -0,0 +1,103 @@
+var photo_clipboard = new Set();
+
+function load_photo_clipboard(event)
+{
+    console.log("Loading photo clipboard");
+    var stored = localStorage.getItem("photo_clipboard");
+    if (stored === null)
+    {
+        if (photo_clipboard.size != 0)
+        {
+            photo_clipboard = new Set();
+        }
+    }
+    else
+    {
+        photo_clipboard = new Set(JSON.parse(stored));
+    }
+
+    var photo_divs = Array.from(document.getElementsByClassName("photo_card"));
+    photo_divs.forEach(apply_check);
+    return photo_clipboard;
+}
+
+function save_photo_clipboard()
+{
+    console.log("Saving photo clipboard");
+    var serialized = JSON.stringify(Array.from(photo_clipboard));
+    localStorage.setItem("photo_clipboard", serialized);
+}
+
+function apply_check(photo_div)
+{
+    var checkbox = photo_div.getElementsByClassName("photo_card_selector_checkbox")[0];
+    if (photo_clipboard.has(photo_div.dataset.id))
+    {
+        checkbox.checked = true;
+    }
+    else
+    {
+        checkbox.checked = false;
+    }
+}
+
+var previous_photo_select;
+function on_photo_select(event)
+{
+    if (event.target.checked)
+    {
+        action = function(photo_div)
+        {
+            photo_div.getElementsByClassName("photo_card_selector_checkbox")[0].checked = true;
+            photo_clipboard.add(photo_div.dataset.id);
+        }
+    }
+    else
+    {
+        action = function(photo_div)
+        {
+            photo_div.getElementsByClassName("photo_card_selector_checkbox")[0].checked = false;
+            photo_clipboard.delete(photo_div.dataset.id);
+        }
+    }
+
+    if (event.shiftKey && previous_photo_select !== undefined)
+    {
+        var current_photo_div = event.target.parentElement;
+        var previous_photo_div = previous_photo_select.target.parentElement;
+        var photo_divs = Array.from(current_photo_div.parentElement.children);
+
+        var current_index = photo_divs.indexOf(current_photo_div);
+        var previous_index = photo_divs.indexOf(previous_photo_div);
+
+        var slice;
+        if (current_index == previous_index)
+        {
+            slice = [current_photo_div];
+        }
+        else if (previous_index < current_index)
+        {
+            slice = photo_divs.slice(previous_index, current_index + 1);
+        }
+        else
+        {
+            slice = photo_divs.slice(current_index, previous_index + 1);
+        }
+
+        slice.forEach(action);
+    }
+    else
+    {
+        var photo_div = event.target.parentElement;
+        action(photo_div);
+    }
+    previous_photo_select = event;
+    save_photo_clipboard();
+}
+
+function onpageload()
+{
+    window.addEventListener("storage", load_photo_clipboard, false);
+    load_photo_clipboard();
+}
+document.addEventListener("DOMContentLoaded", onpageload);

frontends/etiquette_flask/templates/album.html

@@ -8,6 +8,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
     <link rel="stylesheet" href="/static/common.css">
     <script src="/static/common.js"></script>
+    <script src="/static/photoclipboard.js"></script>
 
 <style>
 p

frontends/etiquette_flask/templates/photo_card.html

@@ -17,12 +17,13 @@
 {% macro create_photo_card(photo, view="grid") %}
 
 {% if view == "list" %}
-<div class="photo_card_list">
+<div class="photo_card photo_card_list" data-id="{{photo.id}}">
+    <input type="checkbox" class="photo_card_selector_checkbox" onclick="on_photo_select(event)"/>
     <span class="photo_card_filename"><a target="_blank" href="/photo/{{photo.id}}">{{photo.basename}}</a></span>
     <a class="photo_card_metadata" target="_blank" href="/file/{{photo.id}}.{{photo.extension}}">{{photo.bytestring()}}</a>
 </div>
-
 {% else %}
+
 {% if photo.thumbnail %}
     {% set thumbnail_src = "/thumbnail/" + photo.id + ".jpg" %}
 {% else %}
@@ -39,6 +40,7 @@
 {% for tag in photo.tags() %}
     {% do tag_names_title.append(tag.name) %}
 {% endfor %}
+
 {% set tag_names_title = ", ".join(tag_names_title) %}
 {% if tag_names_title %}
     {% set tag_names_inner = "T" %}
@@ -54,7 +56,7 @@
     {% set metadata_inner = "{m}{d}, ".format(m=metadata_inner, d=photo.duration_string) %}
 {% endif %}
 
-<div class="photo_card_grid">
+<div class="photo_card photo_card_grid" data-id="{{photo.id}}">
     <a class="photo_card_thumbnail" target="_blank" href="/photo/{{photo.id}}">
         <img height="150" src="{{thumbnail_src}}">
     </a>
@@ -69,6 +71,8 @@
     {{- metadata_inner|safe -}}
     <a target="_blank" href="/file/{{photo.id}}.{{photo.extension}}">{{photo.bytestring()}}</a>
     </span>
+
+    <input type="checkbox" class="photo_card_selector_checkbox" onclick="on_photo_select(event)"/>
 </div>
 {% endif %}
 {% endmacro %}

frontends/etiquette_flask/templates/search.html

@@ -9,6 +9,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
     <link rel="stylesheet" href="/static/common.css">
     <script src="/static/common.js"></script>
+    <script src="/static/photoclipboard.js"></script>
 
 <style>
 form