replace ScaledScrollBar with BigScrollBar

step 2 - connect the line up/down, page up/down events

src/ui/bigtext/BigScrollBar.py

@@ -1,4 +1,6 @@
-from PySide6.QtWidgets import QWidget, QStylePainter, QStyle, QStyleOptionSlider, QSlider
+import enum
+
+from PySide6.QtWidgets import QWidget, QStylePainter, QStyle, QStyleOptionSlider, QSlider, QAbstractSlider
 from PySide6.QtCore import Qt, QSize, QEvent, QRect, QPoint, Signal
 
 
@@ -11,6 +13,14 @@ class BigScrollBar(QWidget):
         code involved. We work around this by converting the python int 
         into a string."""
 
+    class ScrollEvent(enum.IntEnum):
+        PageUp = 1
+        PageDown = 2
+        LinesUp = 3
+        LinesDown = 4
+
+    scroll_event = Signal(ScrollEvent)
+
     pressedControl = QStyle.SubControl.SC_None
     click_offset = 0
 
@@ -104,13 +114,13 @@ class BigScrollBar(QWidget):
 
         self.pressedControl = self.style().hitTestComplexControl(QStyle.ComplexControl.CC_ScrollBar, style_options,
                                                                  event.position().toPoint(), self)
-        # print(f"pressedControl {self.pressedControl}")
+        print(f"pressedControl {self.pressedControl}")
 
         sr: QRect = self.style().subControlRect(QStyle.ComplexControl.CC_ScrollBar, style_options,
                                                 QStyle.SubControl.SC_ScrollBarSlider, self)
         click: QPoint = event.position().toPoint()
-        pressYValue = click.y() - sr.center().y() + sr.topLeft().y()
-        pressYValue = self.pixelPosToRangeValue(pressYValue)
+        press_y_value = click.y() - sr.center().y() + sr.topLeft().y()
+        press_y_value = self.pixelPosToRangeValue(press_y_value)
         # print(f"pressYValue {pressYValue}")
 
         if self.pressedControl == QStyle.SubControl.SC_ScrollBarSlider:
@@ -126,6 +136,27 @@ class BigScrollBar(QWidget):
             self.click_offset = slider_length / 2
             pass
 
+        self.activateControl(self.pressedControl)
+        # self.repaint(self.style().subControlRect(QStyle.ComplexControl.CC_ScrollBar, style_options, self.pressedControl))
+
+    def activateControl(self, control):
+        action = QAbstractSlider.SliderAction.SliderNoAction
+        match control:
+            case QStyle.SubControl.SC_ScrollBarAddPage:
+                self.scroll_event.emit(self.ScrollEvent.PageDown)
+            case QStyle.SubControl.SC_ScrollBarSubPage:
+                self.scroll_event.emit(self.ScrollEvent.PageUp)
+            case QStyle.SubControl.SC_ScrollBarAddLine:
+                self.scroll_event.emit(self.ScrollEvent.LinesDown)
+            case QStyle.SubControl.SC_ScrollBarSubLine:
+                self.scroll_event.emit(self.ScrollEvent.LinesUp)
+            case QStyle.SubControl.SC_ScrollBarFirst:
+                self.set_value(self.minimun)
+            case QStyle.SubControl.SC_ScrollBarLast:
+                self.set_value(self.maximum)
+            case _:
+                pass
+
     def mouseReleaseEvent(self, event):
         self.pressedControl = QStyle.SubControl.SC_None
 
@@ -169,5 +200,5 @@ class BigScrollBar(QWidget):
 
     def set_value(self, value: int):
         self.value = value
-        self.value_changed.emit(str(value))
+        self.value_changed.emit(str(self.value))
         self.repaint()

src/ui/bigtext/bigtext.py

@@ -98,7 +98,8 @@ class BigText(QWidget):
         self.h_scroll_bar.valueChanged.connect(self.big_text.h_scroll_event)
 
         # self.v_scroll_bar.setPageStep(1)
-        self.v_scroll_bar.value_changed.connect(self.big_text.v_scroll_event)
+        self.v_scroll_bar.value_changed.connect(self.big_text.v_scroll_value_changed)
+        self.v_scroll_bar.scroll_event.connect(self.big_text.v_scroll_event)
 
         if show_range_slider:
             self.range_limit = RangeSlider()
@@ -399,10 +400,22 @@ class InnerBigText(QWidget):
         self.update()
 
     @Slot()
-    def v_scroll_event(self, byte_offset: str):
+    def v_scroll_value_changed(self, byte_offset: str):
         self._byte_offset = int(byte_offset)
         self.update()
 
+    @Slot()
+    def v_scroll_event(self, event: BigScrollBar.ScrollEvent):
+        match event:
+            case BigScrollBar.ScrollEvent.LinesUp:
+                self.scroll_by_lines(-3)
+            case BigScrollBar.ScrollEvent.LinesDown:
+                self.scroll_by_lines(3)
+            case BigScrollBar.ScrollEvent.PageUp:
+                self.scroll_by_lines(-(int(self.lines_shown()) - 1))
+            case BigScrollBar.ScrollEvent.PageDown:
+                self.scroll_by_lines(int(self.lines_shown()) - 1)
+
     def update_longest_line(self, length: int):
         width_in_chars = self.width() / self.char_width
         # print("width_in_chars: %d" % width_in_chars)