Add prevParaAction

lib/read.py

@@ -53,7 +53,7 @@ class EditDialog(QDialog, Ui_Dialog):
         self.nextBtn.clicked.connect(self.nextAction)
         self.prevBtn.clicked.connect(self.prevAction)
         self.nextParaBtn.clicked.connect(self.nextParaAction)
-        # self.prevParaBtn.clicked.connect(self.prevParaAction)
+        self.prevParaBtn.clicked.connect(self.prevParaAction)
         self.paraEdit.verticalScrollBar().valueChanged.connect(self.scrollSlot)
         self.scrollBtn.clicked.connect(self.scrollAction)
         return
@@ -222,7 +222,7 @@ class EditDialog(QDialog, Ui_Dialog):
         painter.translate(1.0, c_pt.y())
         painter.fillPath(path, brush)
         return
-    
+
     @pyqtSlot()
     def nextParaAction(self) -> None:
         self.block += 1
@@ -232,6 +232,15 @@ class EditDialog(QDialog, Ui_Dialog):
         self.savePosition()
         return
 
+    @pyqtSlot()
+    def prevParaAction(self) -> None:
+        self.block -= 1
+        if self.block < 0:
+            self.prevAction()
+            return
+        self.savePosition()
+        return
+
     @pyqtSlot()
     def defineAction(self) -> None:
         #