support files over 2 GB

ScaledScrollBar.py

@@ -0,0 +1,36 @@
+import math
+
+from PyQt6.QtWidgets import QScrollBar
+import logging
+
+log = logging.getLogger("scaledScrollBar")
+
+
+class ScaledScrollBar(QScrollBar):
+    is_huge = False
+
+    def __init__(self):
+        super(ScaledScrollBar, self).__init__()
+        self.real_maximum = self.maximum()
+
+    def setValue(self, value: int) -> None:
+        if self.is_huge:
+            real_position = value / self.real_maximum
+            super().setValue(self.maximum() * real_position)
+        else:
+            super().setValue(value)
+
+    def setMaximum(self, maximum: int) -> None:
+        if maximum > 2 ** 31:
+            new_maximum = 1000 * math.log2(maximum)
+            super().setMaximum(new_maximum)
+            self.real_maximum = maximum
+
+            if not self.is_huge:
+                old_position = self.value() / self.maximum()
+                self.setValue(new_maximum * old_position)
+
+            self.is_huge = True
+        else:
+            self.is_huge = False
+            super().setMaximum(maximum)