From d800f68b62360f64ab0416f8dad257c2d3b0d47c Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sat, 13 Feb 2016 17:20:11 +0530
Subject: [PATCH] Button to refresh random book

---
 src/pyj/book_list/book_details.pyj | 4 ++++
 src/pyj/book_list/top_bar.pyj      | 7 +++++++
 src/pyj/book_list/ui.pyj           | 6 +++++-
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/pyj/book_list/book_details.pyj b/src/pyj/book_list/book_details.pyj
index 8bb8f9f2ac..b716ac23da 100644
--- a/src/pyj/book_list/book_details.pyj
+++ b/src/pyj/book_list/book_details.pyj
@@ -48,6 +48,10 @@ class BookDetailsPanel:
             self.render_book(book_id)
         else:
             self.fetch_metadata(book_id)
+        get_boss().ui.set_button_visibility('random', not book_id or book_id == '0')
+
+    def show_random(self):
+        self.fetch_metadata('0')
 
     def no_book(self, book_id):
         self.container.appendChild(E.div(
diff --git a/src/pyj/book_list/top_bar.pyj b/src/pyj/book_list/top_bar.pyj
index f139e2a85c..4f2bbda715 100644
--- a/src/pyj/book_list/top_bar.pyj
+++ b/src/pyj/book_list/top_bar.pyj
@@ -107,6 +107,13 @@ class TopBar:
                 if action is not None:
                     right.lastChild.addEventListener('click', def(event): event.preventDefault(), action();)
 
+    def set_button_visibility(self, icon_name, visible):
+        for bar in self.bar, self.dummy_bar:
+            right = bar.firstChild.nextSibling
+            elem = right.querySelector('i.fa.fa-fw.fa-' + icon_name)
+            if elem:
+                elem.parentNode.style.display = 'inline' if visible else 'none'
+
     def apply_state(self, left, buttons):
         self.set_left(**left)
         for bar in self.bar, self.dummy_bar:
diff --git a/src/pyj/book_list/ui.pyj b/src/pyj/book_list/ui.pyj
index 5e8806e479..07116228e6 100644
--- a/src/pyj/book_list/ui.pyj
+++ b/src/pyj/book_list/ui.pyj
@@ -104,7 +104,8 @@ class UI:
         bss.add_button(icon_name='cogs', tooltip=_('Configure Tag Browser'), action=show_panel_action('booklist-config-tb'))
         self.panel_map['booklist-search'] = UIState(bss, main_panel=self.search_panel)
 
-        self.panel_map['book-details'] = UIState(ClosePanelBar(_('Book Details')), main_panel=self.book_details_panel)
+        self.panel_map['book-details'] = bd = UIState(ClosePanelBar(_('Book Details')), main_panel=self.book_details_panel)
+        bd.add_button(icon_name='random', tooltip=_('Pick another random book'), action=self.book_details_panel.show_random.bind(self.book_details_panel))
 
     def create_prefences_panel(self, title, close_callback=None, panel_data=None):
         ans = UIState(ClosePanelBar(title), close_callback=close_callback, main_panel=self.prefs_panel, panel_data=panel_data)
@@ -114,6 +115,9 @@ class UI:
     def set_title(self, text):
         self.top_bar.set_title(text)
 
+    def set_button_visibility(self, icon_name, visible):
+        self.top_bar.set_button_visibility(icon_name, visible)
+
     def on_resize(self):
         pass