Make spacing between covers adjustable

src/calibre/gui2/__init__.py

@@ -115,6 +115,7 @@ defs['cover_grid_width'] = 0
 defs['cover_grid_height'] = 0
 defs['cover_grid_color'] = (80, 80, 80)
 defs['cover_grid_cache_size'] = 200
+defs['cover_grid_spacing'] = 0
 del defs
 # }}}
 

src/calibre/gui2/library/alternate_views.py

@@ -368,11 +368,18 @@ class CoverDelegate(QStyledItemDelegate):
             width *= self.parent().logicalDpiX() * CM_TO_INCH
         self.cover_size = QSize(width, height)
         self.item_size = self.cover_size + QSize(8, 8)
-        self.spacing = max(10, min(50, int(0.1 * width)))
+        self.calculate_spacing()
         self.animation.setStartValue(1.0)
         self.animation.setKeyValueAt(0.5, 0.5)
         self.animation.setEndValue(1.0)
 
+    def calculate_spacing(self):
+        spc = self.original_spacing = gprefs['cover_grid_spacing']
+        if spc < 0.1:
+            self.spacing = max(10, min(50, int(0.1 * self.original_width)))
+        else:
+            self.spacing = self.parent().logicalDpiX() * CM_TO_INCH * spc
+
     def sizeHint(self, option, index):
         return self.item_size
 
@@ -479,6 +486,9 @@ class GridView(QListView):
             self.delegate.set_dimensions()
             self.setSpacing(self.delegate.spacing)
             self.delegate.cover_cache.clear()
+        if gprefs['cover_grid_spacing'] != self.delegate.original_spacing:
+            self.delegate.calculate_spacing()
+            self.setSpacing(self.delegate.spacing)
         self.set_color()
         self.delegate.cover_cache.set_limit(gprefs['cover_grid_cache_size'])
 

src/calibre/gui2/preferences/look_feel.py

@@ -113,6 +113,7 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
         r('cover_grid_width', gprefs)
         r('cover_grid_height', gprefs)
         r('cover_grid_cache_size', gprefs)
+        r('cover_grid_spacing', gprefs)
 
         r('cover_flow_queue_length', config, restart_required=True)
         r('cover_browser_reflections', gprefs)

src/calibre/gui2/preferences/look_feel.ui

@@ -231,8 +231,8 @@
       <attribute name="title">
        <string>Cover Grid</string>
       </attribute>
-      <layout class="QVBoxLayout" name="verticalLayout">
-       <item>
+      <layout class="QFormLayout" name="formLayout">
+       <item row="0" column="0" colspan="2">
         <layout class="QHBoxLayout" name="horizontalLayout_2">
          <item>
           <widget class="QLabel" name="label_11">
@@ -272,6 +272,9 @@
            <property name="toolTip">
             <string>The height of displayed covers</string>
            </property>
+           <property name="specialValueText">
+            <string>Automatic</string>
+           </property>
            <property name="suffix">
             <string> cm</string>
            </property>
@@ -305,13 +308,16 @@
          </item>
         </layout>
        </item>
-       <item>
+       <item row="1" column="0" colspan="2">
         <layout class="QHBoxLayout" name="horizontalLayout_3">
          <item>
           <widget class="QLabel" name="label_14">
            <property name="text">
             <string>Background color for the cover grid:</string>
            </property>
+           <property name="buddy">
+            <cstring>cover_grid_color_button</cstring>
+           </property>
           </widget>
          </item>
          <item>
@@ -352,9 +358,7 @@
          </item>
         </layout>
        </item>
-       <item>
-        <layout class="QHBoxLayout" name="horizontalLayout_4">
-         <item>
+       <item row="2" column="0">
         <widget class="QLabel" name="label_15">
          <property name="text">
           <string>Number of covers to cache in &amp;memory:</string>
@@ -364,40 +368,38 @@
          </property>
         </widget>
        </item>
-         <item>
+       <item row="2" column="1">
         <widget class="QSpinBox" name="opt_cover_grid_cache_size">
          <property name="maximum">
           <number>3000</number>
          </property>
         </widget>
        </item>
-         <item>
-          <spacer name="horizontalSpacer_3">
-           <property name="orientation">
-            <enum>Qt::Horizontal</enum>
+       <item row="3" column="0">
+        <widget class="QLabel" name="label_16">
+         <property name="text">
+          <string>&amp;Spacing between covers:</string>
          </property>
-           <property name="sizeHint" stdset="0">
-            <size>
-             <width>40</width>
-             <height>20</height>
-            </size>
+         <property name="buddy">
+          <cstring>opt_cover_grid_spacing</cstring>
          </property>
-          </spacer>
+        </widget>
        </item>
-        </layout>
-       </item>
-       <item>
-        <spacer name="verticalSpacer">
-         <property name="orientation">
-          <enum>Qt::Vertical</enum>
+       <item row="3" column="1">
+        <widget class="QDoubleSpinBox" name="opt_cover_grid_spacing">
+         <property name="toolTip">
+          <string>The spacing between covers. A value of zero means calculate automatically based on cover size.</string>
          </property>
-         <property name="sizeHint" stdset="0">
-          <size>
-           <width>20</width>
-           <height>355</height>
-          </size>
+         <property name="specialValueText">
+          <string>Automatic</string>
          </property>
-        </spacer>
+         <property name="suffix">
+          <string> cm</string>
+         </property>
+         <property name="decimals">
+          <number>1</number>
+         </property>
+        </widget>
        </item>
       </layout>
      </widget>