Simplify the typewriter mode

nw/config.py

@@ -128,6 +128,7 @@ class Config:
         self.doReplaceDots   = True
         self.scrollPastEnd   = True
         self.scollWithCursor = False
+        self.scollFromPoint  = 40
 
         self.wordCountTimer  = 5.0
         self.showTabsNSpaces = False
@@ -467,6 +468,9 @@ class Config:
         self.scollWithCursor = self._parseLine(
             cnfParse, cnfSec, "scollwithcursor", self.CNF_BOOL, self.scollWithCursor
         )
+        self.scollFromPoint = self._parseLine(
+            cnfParse, cnfSec, "scollfrompoint", self.CNF_INT, self.scollFromPoint
+        )
         self.fmtSingleQuotes = self._parseLine(
             cnfParse, cnfSec, "fmtsinglequote", self.CNF_LIST, self.fmtSingleQuotes
         )
@@ -613,6 +617,7 @@ class Config:
         cnfParse.set(cnfSec, "repdots",         str(self.doReplaceDots))
         cnfParse.set(cnfSec, "scrollpastend",   str(self.scrollPastEnd))
         cnfParse.set(cnfSec, "scollwithcursor", str(self.scollWithCursor))
+        cnfParse.set(cnfSec, "scollfrompoint",  str(self.scollFromPoint))
         cnfParse.set(cnfSec, "fmtsinglequote",  self._packList(self.fmtSingleQuotes))
         cnfParse.set(cnfSec, "fmtdoublequote",  self._packList(self.fmtDoubleQuotes))
         cnfParse.set(cnfSec, "spelltool",       str(self.spellTool))

nw/gui/doceditor.py

@@ -88,8 +88,6 @@ class GuiDocEditor(QTextEdit):
         self.bigDoc     = False # Flag for very large document size
         self.doReplace  = False # Switch to temporarily disable auto-replace
         self.queuePos   = None  # Used for delayed change of cursor position
-        self.cursorLast = 0     # The last known vertical position of the cursor
-        self.lengthLast = 0
 
         # Typography
         self.typDQOpen  = self.mainConf.fmtDoubleQuotes[0]
@@ -102,8 +100,6 @@ class GuiDocEditor(QTextEdit):
         self.qDocument.contentsChange.connect(self._docChange)
         self.qDocument.documentLayout().documentSizeChanged.connect(self._docSizeChanged)
 
-        self.verticalScrollBar().sliderMoved.connect(self._doVerticalScroll)
-
         # Document Title
         self.docHeader = GuiDocEditHeader(self)
         self.docFooter = GuiDocEditFooter(self)
@@ -440,7 +436,7 @@ class GuiDocEditor(QTextEdit):
 
         if self.mainConf.scrollPastEnd:
             docFrame = self.qDocument.rootFrame().frameFormat()
-            docMargin = wH - uM - lM - 5*self.theTheme.fontPixelSize
+            docMargin = wH - uM - lM - 4*tB - 5*self.theTheme.fontPixelSize
             docFrame.setBottomMargin(max(0, docMargin))
             self.qDocument.rootFrame().setFrameFormat(docFrame)
 
@@ -496,7 +492,6 @@ class GuiDocEditor(QTextEdit):
             theCursor.setPosition(thePosition)
             self.setTextCursor(theCursor)
             self.docFooter.updateLineCount()
-            self.cursorLast = self.cursorRect().center().y()
 
         return True
 
@@ -777,20 +772,13 @@ class GuiDocEditor(QTextEdit):
             self.docFooter.updateLineCount()
 
         if self.mainConf.scollWithCursor:
-            docLen = self.qDocument.characterCount()
-            if docLen == self.lengthLast:
-                # No change, so just update last position
-                self.cursorLast = self.cursorRect().center().y()
-            else:
-                # The user typed something, so check if we need to
-                # scroll, and move the scroll bar the same distance
-                self.lengthLast = docLen
-                self.ensureCursorVisible()
+            kMod = keyEvent.modifiers()
+            if kMod == Qt.NoModifier or kMod == Qt.ShiftModifier:
                 cPos = self.cursorRect().center().y()
-                if cPos != self.cursorLast:
-                    vBar = self.verticalScrollBar()
-                    vBar.setValue(vBar.value() + cPos - self.cursorLast)
-                    self.cursorLast = self.cursorRect().center().y()
+                mPos = self.mainConf.scollFromPoint*self.height()*0.01
+                vBar = self.verticalScrollBar()
+                vBar.setValue(vBar.value() + cPos - round(mPos))
+                self.ensureCursorVisible()
 
         return
 
@@ -817,18 +805,9 @@ class GuiDocEditor(QTextEdit):
 
         QTextEdit.mouseReleaseEvent(self, mEvent)
         self.docFooter.updateLineCount()
-        self.cursorLast = self.cursorRect().center().y()
 
         return
 
-    def wheelEvent(self, theEvent):
-        """Briefly capture the mouse wheel event to capture the cursor
-        position.
-        """
-        QTextEdit.wheelEvent(self, theEvent)
-        self.cursorLast = self.cursorRect().center().y()
-        return
-
     def resizeEvent(self, theEvent):
         """If the text editor is resize, we must make sure the document
         has its margins adjusted according to user preferences.
@@ -863,13 +842,6 @@ class GuiDocEditor(QTextEdit):
             self._docAutoReplace(self.qDocument.findBlock(thePos))
         return
 
-    @pyqtSlot(int)
-    def _doVerticalScroll(self, theChange):
-        """Update the cursor position on vertical scrolling.
-        """
-        self.cursorLast = self.cursorRect().center().y()
-        return
-
     @pyqtSlot("QPoint")
     def _openContextMenu(self, thePos):
         """Triggered by right click to open the context menu. Also

nw/gui/preferences.py

@@ -555,6 +555,10 @@ class GuiConfigEditLayoutTab(QWidget):
             theUnit="px"
         )
 
+        # Scroll Behaviour
+        # ================
+        self.mainForm.addGroupLabel("Scroll Behaviour")
+
         ## Scroll Past End
         self.scrollPastEnd = QSwitch()
         self.scrollPastEnd.setChecked(self.mainConf.scrollPastEnd)
@@ -568,11 +572,25 @@ class GuiConfigEditLayoutTab(QWidget):
         self.scollWithCursor = QSwitch()
         self.scollWithCursor.setChecked(self.mainConf.scollWithCursor)
         self.mainForm.addRow(
-            "Typewriter style scrolling",
+            "Typewriter style scrolling when you type",
             self.scollWithCursor,
-            "Scrolls up when the cursor moves to a new line."
+            "Tries to keep the cursor at a fixed vertical position."
         )
 
+        ## Font Size
+        self.scollFromPoint = QSpinBox(self)
+        self.scollFromPoint.setMinimum(10)
+        self.scollFromPoint.setMaximum(90)
+        self.scollFromPoint.setSingleStep(1)
+        self.scollFromPoint.setValue(self.mainConf.scollFromPoint)
+        self.mainForm.addRow(
+            "Position in the editor to keep the cursor",
+            self.scollFromPoint,
+            "In units of percentage of the editor height.",
+            theUnit = "%"
+        )
+
+
         return
 
     def saveValues(self):
@@ -592,6 +610,7 @@ class GuiConfigEditLayoutTab(QWidget):
         tabWidth        = self.tabWidth.value()
         scrollPastEnd   = self.scrollPastEnd.isChecked()
         scollWithCursor = self.scollWithCursor.isChecked()
+        scollFromPoint  = self.scollFromPoint.value()
 
         self.mainConf.textFont        = textFont
         self.mainConf.textSize        = textSize
@@ -604,6 +623,7 @@ class GuiConfigEditLayoutTab(QWidget):
         self.mainConf.tabWidth        = tabWidth
         self.mainConf.scrollPastEnd   = scrollPastEnd
         self.mainConf.scollWithCursor = scollWithCursor
+        self.mainConf.scollFromPoint  = scollFromPoint
 
         self.mainConf.confChanged = True
 

tests/reference/novelwriter.conf

@@ -1,5 +1,5 @@
 [Main]
-timestamp = 2020-10-11 18:29:34
+timestamp = 2020-10-11 22:50:45
 theme = default
 syntax = default_light
 icons = typicons_colour_light
@@ -41,6 +41,7 @@ repdash = True
 repdots = True
 scrollpastend = True
 scollwithcursor = False
+scollfrompoint = 40
 fmtsinglequote = ‘, ’
 fmtdoublequote = “, ”
 spelltool = internal

tests/reference/novelwriter_prefs.conf

@@ -41,6 +41,7 @@ repdash = True
 repdots = True
 scrollpastend = False
 scollwithcursor = True
+scollfrompoint = 40
 fmtsinglequote = ‘, ’
 fmtdoublequote = “, ”
 spelltool = internal