Implement #4536 (Auto fit-to-view of cover display in details view)

src/calibre/gui2/dialogs/book_info.py

@@ -7,10 +7,12 @@ __docformat__ = 'restructuredtext en'
 '''
 import textwrap, os
 
-from PyQt4.QtCore import QCoreApplication, SIGNAL, QModelIndex, QUrl
+from PyQt4.QtCore import QCoreApplication, SIGNAL, QModelIndex, QUrl, QTimer, Qt
 from PyQt4.QtGui import QDialog, QPixmap, QGraphicsScene, QIcon, QDesktopServices
 
 from calibre.gui2.dialogs.book_info_ui import Ui_BookInfo
+from calibre.gui2 import dynamic
+from calibre import fit_image
 
 class BookInfo(QDialog, Ui_BookInfo):
 
@@ -18,6 +20,7 @@ class BookInfo(QDialog, Ui_BookInfo):
         QDialog.__init__(self, parent)
         Ui_BookInfo.__init__(self)
         self.setupUi(self)
+        self.cover_pixmap = None
         desktop = QCoreApplication.instance().desktop()
         screen_height = desktop.availableGeometry().height() - 100
         self.resize(self.size().width(), screen_height)
@@ -25,12 +28,22 @@ class BookInfo(QDialog, Ui_BookInfo):
 
         self.view = view
         self.current_row = None
+        self.fit_cover.setChecked(dynamic.get('book_info_dialog_fit_cover',
+            False))
         self.refresh(row)
         self.connect(self.view.selectionModel(), SIGNAL('currentChanged(QModelIndex,QModelIndex)'), self.slave)
         self.connect(self.next_button, SIGNAL('clicked()'), self.next)
         self.connect(self.previous_button, SIGNAL('clicked()'), self.previous)
         self.connect(self.text, SIGNAL('linkActivated(QString)'), self.open_book_path)
+        self.fit_cover.stateChanged.connect(self.toggle_cover_fit)
+        self.cover.resizeEvent = self.cover_view_resized
 
+    def toggle_cover_fit(self, state):
+        dynamic.set('book_info_dialog_fit_cover', self.fit_cover.isChecked())
+        self.resize_cover()
+
+    def cover_view_resized(self, event):
+        QTimer.singleShot(1, self.resize_cover)
     def slave(self, current, previous):
         row = current.row()
         self.refresh(row)
@@ -57,6 +70,22 @@ class BookInfo(QDialog, Ui_BookInfo):
         if ni.isValid():
             self.view.setCurrentIndex(ni)
 
+    def resize_cover(self):
+        if self.cover_pixmap is None:
+            return
+        self.setWindowIcon(QIcon(self.cover_pixmap))
+        self.scene = QGraphicsScene()
+        pixmap = self.cover_pixmap
+        if self.fit_cover.isChecked():
+            scaled, new_width, new_height = fit_image(pixmap.width(),
+                    pixmap.height(), self.cover.size().width()-10,
+                    self.cover.size().height()-10)
+            if scaled:
+                pixmap = pixmap.scaled(new_width, new_height,
+                        Qt.KeepAspectRatio, Qt.SmoothTransformation)
+        self.scene.addPixmap(pixmap)
+        self.cover.setScene(self.scene)
+
     def refresh(self, row):
         if isinstance(row, QModelIndex):
             row = row.row()
@@ -71,12 +100,8 @@ class BookInfo(QDialog, Ui_BookInfo):
         self.comments.setText(info.pop(_('Comments'), ''))
 
         cdata = info.pop('cover', '')
-        pixmap = QPixmap.fromImage(cdata)
-        self.setWindowIcon(QIcon(pixmap))
-        
-        self.scene = QGraphicsScene()
-        self.scene.addPixmap(pixmap)
-        self.cover.setScene(self.scene)
+        self.cover_pixmap = QPixmap.fromImage(cdata)
+        self.resize_cover()
 
         rows = u''
         self.text.setText('')

src/calibre/gui2/dialogs/book_info.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
  <class>BookInfo</class>
  <widget class="QDialog" name="BookInfo">
@@ -53,6 +54,13 @@
        </layout>
       </widget>
      </item>
+     <item>
+      <widget class="QCheckBox" name="fit_cover">
+       <property name="text">
+        <string>Fit &amp;cover to view</string>
+       </property>
+      </widget>
+     </item>
      <item>
       <layout class="QHBoxLayout" name="horizontalLayout">
        <item>