From 96c1243515f4405bfe9bafd7f93ecabb214ba665 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 19 Nov 2013 10:13:32 +0530
Subject: [PATCH] Button to turn of preview position syncing

---
 resources/images/sync-right.png        | Bin 0 -> 4435 bytes
 src/calibre/gui2/tweak_book/preview.py |  14 ++++++++++++++
 src/calibre/gui2/tweak_book/ui.py      |   2 ++
 3 files changed, 16 insertions(+)
 create mode 100644 resources/images/sync-right.png

diff --git a/resources/images/sync-right.png b/resources/images/sync-right.png
new file mode 100644
index 0000000000000000000000000000000000000000..36df10c35bb66fcf82933ef089c9a493e46ab604
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diff --git a/src/calibre/gui2/tweak_book/preview.py b/src/calibre/gui2/tweak_book/preview.py
index 37cb32f873..2e3fc92635 100644
--- a/src/calibre/gui2/tweak_book/preview.py
+++ b/src/calibre/gui2/tweak_book/preview.py
@@ -416,6 +416,13 @@ class Preview(QWidget):
         self.auto_reload_toggled(ac.isChecked())
         self.bar.addAction(ac)
 
+        ac = actions['sync-preview-to-editor']
+        ac.setCheckable(True)
+        ac.setChecked(True)
+        ac.toggled.connect(self.sync_toggled)
+        self.sync_toggled(ac.isChecked())
+        self.bar.addAction(ac)
+
         ac = actions['reload-preview']
         ac.triggered.connect(self.refresh)
         self.bar.addAction(ac)
@@ -438,6 +445,8 @@ class Preview(QWidget):
         QTimer.singleShot(100, self._sync_to_editor)
 
     def _sync_to_editor(self):
+        if not actions['sync-preview-to-editor'].isChecked():
+            return
         try:
             if self.refresh_timer.isActive() or self.current_sync_request[0] != self.current_name:
                 return QTimer.singleShot(100, self._sync_to_editor)
@@ -487,6 +496,11 @@ class Preview(QWidget):
             'Auto reload preview when text changes in editor') if not checked else _(
                 'Disable auto reload of preview'))
 
+    def sync_toggled(self, checked):
+        actions['sync-preview-to-editor'].setToolTip(_(
+            'Disable syncing of preview position to editor position') if checked else _(
+                'Enable syncing of preview position to editor position'))
+
     def visibility_changed(self, is_visible):
         if is_visible:
             self.refresh()
diff --git a/src/calibre/gui2/tweak_book/ui.py b/src/calibre/gui2/tweak_book/ui.py
index 822f6539f2..32a29f6956 100644
--- a/src/calibre/gui2/tweak_book/ui.py
+++ b/src/calibre/gui2/tweak_book/ui.py
@@ -220,6 +220,8 @@ class Main(MainWindow):
         # Preview actions
         group = _('Preview')
         self.action_auto_reload_preview = reg('auto-reload.png', _('Auto reload preview'), None, 'auto-reload-preview', (), _('Auto reload preview'))
+        self.action_auto_sync_preview = reg('sync-right.png', _('Sync preview position to editor position'), None, 'sync-preview-to-editor', (), _(
+            'Sync preview position to editor position'))
         self.action_reload_preview = reg('view-refresh.png', _('Refresh preview'), None, 'reload-preview', ('F5',), _('Refresh preview'))
 
         # Search actions