Fix manual zoom padding, Speed up hashing

__main__.py

@@ -18,6 +18,7 @@
         ✓ Search bar in toolbar
         ✓ Shift focus to the tab that has the book open
         ✓ Tie file deletion and tab closing to model updates
+        ✓ Create separate thread for parser - Show progress in main window
         ? Create emblem per filetype
         Look into how you might group icons
         Ignore a / the / numbers for sorting purposes
@@ -26,8 +27,8 @@
         Mass tagging
         Information dialog widget
         Context menu: Cache, Read, Edit database, delete, Mark read/unread
-        Create separate thread for parser - Show progress in main window
         Set focus to newly added file
+        Better way to thread than subprocess QThread
     Reading:
         ✓ Drop down for TOC
         ✓ Override the keypress event of the textedit
@@ -494,12 +495,16 @@ class MainUI(QtWidgets.QMainWindow, mainwindow.Ui_MainWindow):
         if signal_sender == 'zoomOut':
             self.comic_profile['zoom_mode'] = 'manualZoom'
             self.comic_profile['padding'] += 50
+
+            # This prevents infinite zoom out
             if self.comic_profile['padding'] * 2 > current_tab.contentView.viewport().width():
                 self.comic_profile['padding'] -= 50
 
         if signal_sender == 'zoomIn':
             self.comic_profile['zoom_mode'] = 'manualZoom'
             self.comic_profile['padding'] -= 50
+
+            # This prevents infinite zoom in
             if self.comic_profile['padding'] < 0:
                 self.comic_profile['padding'] = 0
 
@@ -508,6 +513,8 @@ class MainUI(QtWidgets.QMainWindow, mainwindow.Ui_MainWindow):
             self.comic_profile['padding'] = 0
             self.bookToolBar.fitWidth.setChecked(True)
 
+        # Padding in the following cases is decided by
+        # the image pixmap loaded by the widget
         if signal_sender == 'bestFit':
             self.comic_profile['zoom_mode'] = 'bestFit'
             self.bookToolBar.bestFit.setChecked(True)
@@ -615,7 +622,6 @@ class MainUI(QtWidgets.QMainWindow, mainwindow.Ui_MainWindow):
             QtWidgets.qApp.exit()
 
 
-
 def main():
     app = QtWidgets.QApplication(sys.argv)
     app.setApplicationName('Lector')  # This is needed for QStandardPaths

settingsdialog.py

@@ -46,4 +46,3 @@ class SettingsUI(QtWidgets.QDialog, settingswindow.Ui_Dialog):
             QtWidgets.QFileDialog.ShowDirsOnly)
 
         # Directories will NOT be added recursively
-

sorter.py

@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 
 # TODO
-# See if tags can be generated from book content
 # See if you want to include a hash of the book's name and author
 
 import os
@@ -87,10 +86,13 @@ class BookSorter:
         # full path of the ebook file
 
         with open(filename, 'rb') as current_book:
-            file_md5 = hashlib.md5(current_book.read()).hexdigest()
+            # This should speed up addition for larger files
+            # without compromising the integrity of the process
+            first_bytes = current_book.read(1024 * 32)  # First 32KB of the file
+            salt = filename.encode()
+            first_bytes += salt
+            file_md5 = hashlib.md5(first_bytes).hexdigest()
 
-        # TODO
-        # Make use of this
         self.statistics[0] += 1
         self.progressbar.setValue(self.statistics[0])
 

widgets.py

@@ -512,6 +512,12 @@ class PliantQGraphicsView(QtWidgets.QGraphicsView):
         elif zoom_mode == 'originalSize':
             image_pixmap = self.image_pixmap
 
+            new_padding = (self.viewport().width() - image_pixmap.width()) // 2
+            if new_padding < 0:  # The image is larger than the viewport
+                self.main_window.comic_profile['padding'] = 0
+            else:
+                self.main_window.comic_profile['padding'] = new_padding
+
         elif zoom_mode == 'bestFit':
             available_width = self.viewport().width()
             available_height = self.viewport().height()
@@ -520,6 +526,9 @@ class PliantQGraphicsView(QtWidgets.QGraphicsView):
                 available_width, available_height,
                 QtCore.Qt.KeepAspectRatio, QtCore.Qt.SmoothTransformation)
 
+            self.main_window.comic_profile['padding'] = (
+                self.viewport().width() - image_pixmap.width()) // 2
+
         elif zoom_mode == 'manualZoom':
             available_width = self.viewport().width() - 2 * padding
             image_pixmap = self.image_pixmap.scaledToWidth(