keep position on handle

src/ui/rangeslider.py

@@ -44,8 +44,6 @@ class RangeSlider(QWidget):
         super(RangeSlider, self).__init__()
         self.setFixedWidth(self._width)
 
-        self.draw_ticks = False
-
         self.min_value = 0
         self.max_value = 100
 
@@ -54,6 +52,7 @@ class RangeSlider(QWidget):
 
         self.selected_handle = None
         self.selection_drag_range = (self.min_value, self.max_value)
+        self.drag_y_offset_in_handle = 0
 
     def set_maximum(self, max: int):
         if self.max_value == max:
@@ -69,8 +68,6 @@ class RangeSlider(QWidget):
     def paintEvent(self, event: PySide6.QtGui.QPaintEvent) -> None:
         painter = QPainter(self)
         self._draw_background(painter)
-        if self.draw_ticks:
-            self._draw_ticks(painter)
         self._draw_handle(painter, self.lower_value)
         self._draw_handle(painter, self.upper_value, direction=-1)
 
@@ -90,19 +87,6 @@ class RangeSlider(QWidget):
                      self._value_to_pixel(self.upper_value.value - self.lower_value.value) - 2 * self._handle_width)
         painter.drawRoundedRect(rect, 3.0, 3.0)
 
-    def _draw_ticks(self, painter: QPainter) -> None:
-        painter.setPen(to_qcolor("333333"))
-
-        min_tick_distance = 25
-        full_height = self.height() - 2 * self._handle_width
-        ticks = math.floor(full_height / min_tick_distance)
-        actual_tick_distance = full_height / ticks
-        print(f"ticks {ticks}")
-        y = actual_tick_distance + self._handle_width
-        while y < full_height:
-            painter.drawLine(8, y, 12, y)
-            y = y + actual_tick_distance
-
     def _draw_handle(self, painter: QPainter, handle: RangeSliderHandle, direction=1) -> None:
         y_pixel = self._value_to_pixel(handle.value)
 
@@ -144,9 +128,11 @@ class RangeSlider(QWidget):
             if self._is_on_handle(self.lower_value, pos.y(), direction=1):
                 self.selected_handle = self.lower_value
                 self.selection_drag_range = (self.min_value, self.upper_value.value)
+                self.drag_y_offset_in_handle = self.selected_handle.value - self._pixel_to_value(pos.y())
             if self._is_on_handle(self.upper_value, pos.y(), direction=-1):
                 self.selected_handle = self.upper_value
                 self.selection_drag_range = (self.lower_value.value, self.max_value)
+                self.drag_y_offset_in_handle = self.selected_handle.value - self._pixel_to_value(pos.y())
 
     def mouseReleaseEvent(self, event: PySide6.QtGui.QMouseEvent) -> None:
         self.selected_handle = None
@@ -154,7 +140,7 @@ class RangeSlider(QWidget):
     def mouseMoveEvent(self, e: PySide6.QtGui.QMouseEvent) -> None:
         if self.selected_handle != None:
             pos: QPoint = e.pos()
-            value = self._pixel_to_value(pos.y())
+            value = self._pixel_to_value(pos.y()) + self.drag_y_offset_in_handle
             if self.selection_drag_range[0] <= value <= self.selection_drag_range[1]:
                 self.selected_handle.value = value
                 # print("%s, %s" %(self.lower_value.value, self.upper_value.value))