added viewnext and viewprev routes and plumbed these in to the file viewer code. Viewer code now works has a prev/next button, and handles videos

files.py

@@ -450,6 +450,37 @@ def move_files():
     st.SetMessage( f"Created&nbsp;<a href=/job/{job.id}>Job #{job.id}</a>&nbsp;to move selected file(s)")
     return render_template("base.html")
 
+@app.route("/viewnext", methods=["GET","POST"])
+@login_required
+def viewnext():
+    if request.method=="POST":
+        id = request.form['current']
+        eids=request.form['eids']
+        lst = eids.split(',')
+        new_id = lst[lst.index(id)+1]
+        obj = Entry.query.join(File).filter(Entry.id==new_id).first()
+    return render_template("viewer.html", obj=obj, eids=eids)
+
+@app.route("/viewprev", methods=["GET","POST"])
+@login_required
+def viewprev():
+    if request.method=="POST":
+        id = request.form['current']
+        eids=request.form['eids']
+        lst = eids.split(',')
+        new_id = lst[lst.index(id)-1]
+        obj = Entry.query.join(File).filter(Entry.id==new_id).first()
+    return render_template("viewer.html", obj=obj, eids=eids)
+
+@app.route("/view/<id>", methods=["GET","POST"])
+@login_required
+def view_img(id):
+    obj = Entry.query.join(File).filter(Entry.id==id).first()
+    if request.method=="POST":
+        eids=request.form['eids']
+    else:
+        eids=''
+    return render_template("viewer.html", obj=obj, eids=eids)
 
 ################################################################################
 # /static -> returns the contents of any file referenced inside /static.