the same line cache was used for the file view and the filter view

repaint causes an endless loop on windows and crashes the app

requirements.txt

@@ -1,5 +1,5 @@
 pip==24.0
-PySide6_Essentials==6.6.2
+PySide6_Essentials==6.7.0
-setuptools==69.2.0
+setuptools==69.5.1
 watchdog==4.0.0
-pyinstaller==6.5.0
+pyinstaller==6.6.0

src/new_big_text/bigger_text.py

@@ -0,0 +1,273 @@
+import argparse
+import enum
+
+import signal, os
+import logging
+import signal
+import time
+from io import TextIOWrapper
+from typing import List
+
+from PySide6 import QtCore, QtGui
+from PySide6.QtGui import QPaintEvent, QPainter, QFont, QFontMetrics, QColor
+from PySide6.QtWidgets import QApplication, QMainWindow, QWidget, QStatusBar
+from PySide6.QtCore import QTimer, QPoint, Qt
+import sys
+from src.pluginregistry import PluginRegistry
+import gettext
+
+__version__ = '0.2.1'
+
+from src.i18n import _
+
+gettext.install('krowlog', 'locale')
+
+logging.basicConfig(level=logging.INFO)
+log = logging.getLogger("main")
+
+
+def register_signal_handler():
+    signal.signal(signal.SIGINT, stop_signal)
+    signal.signal(signal.SIGTERM, stop_signal)
+
+
+def stop_signal(signum, _stackframe):
+    """ Handle terminate signal """
+    try:
+        log.info("Terminate signal received. %s", signum)
+        QtCore.QCoreApplication.quit()
+    except Exception:
+        log.exception("Exception occurred while terminating")
+        sys.exit(1)
+    sys.exit(0)
+
+
+MAX_LINE_LENGTH = 4096
+
+logging.basicConfig(level=logging.INFO)
+log = logging.getLogger("main")
+
+
+class FileWithTimeout:
+    def __init__(self):
+        pass
+
+    def handler(signum, frame):
+        signame = signal.Signals(signum).name
+        print(f'Signal handler called with signal {signame} ({signum})')
+        raise OSError("Couldn't open device!")
+
+    def open(path: str, timeout_in_seconds: int = 10, mode="rb", encoding=None) -> TextIOWrapper:
+        # Set the signal handler and a 5-second alarm
+        signal.signal(signal.SIGALRM, FileWithTimeout.handler)
+        signal.alarm(timeout_in_seconds)
+        fd = open(path, mode=mode, encoding=encoding)
+        signal.alarm(0)  # Disable the alarm
+        return fd
+
+
+class MainWindow(QMainWindow):
+    def __init__(self, *args, **kwargs):
+        super(MainWindow, self).__init__(*args, **kwargs)
+
+        self.setWindowTitle(_("KrowLog"))
+        self.setMinimumWidth(600)
+        self.setMinimumHeight(480)
+        bigger_text = BiggerText()
+        self.setCentralWidget(bigger_text)
+        self.status_bar = QStatusBar(self)
+        self.setStatusBar(self.status_bar)
+        self.status_bar.setAutoFillBackground(True)
+        self.status_bar.showMessage("bla blub")
+
+
+def apply_time_workaround():
+    # workaround to make signals work in QT apps.
+    # They do not work out of the box, because the main thread
+    # is running in C++ code once app.exec() is executed
+    # Forcing an empty lambda to be executed periodically gives
+    # control back to python and allows python to react to signals
+    timer = QTimer()
+    timer.timeout.connect(lambda: None)
+    timer.start(100)
+
+
+class LineType(enum.IntEnum):
+    Full = 1
+    Begin = 2
+    Middle = 3
+    End = 4
+
+
+class Line:
+    def __init__(self, byte_offset: int, byte_end: int, text: str, type: LineType = LineType.Full):
+        """
+        :type byte_offset: int the offset of the first byte of this line
+        :type byte_end: int the offset of the last byte of this line
+        :type text: str the decoded text
+        :type continued: bool True if the previous line was too long and has been split
+        """
+        self._byte_offset = byte_offset
+        self._byte_end = byte_end
+        self._text = text
+        self._type = type
+
+    def byte_offset(self) -> int:
+        return self._byte_offset
+
+    def byte_end(self) -> int:
+        return self._byte_end
+
+    def text(self) -> str:
+        return self._text
+
+    def type(self) -> LineType:
+        return self._type
+
+    def __str__(self):
+        return "%s (%d->%d %s)" % (self._text, self._byte_offset, self._byte_end, self._type.name)
+
+    def __repr__(self):
+        return "%s (%d->%d %s)" % (repr(self._text), self._byte_offset, self._byte_end, self._type.name)
+
+    def __eq__(self, other):
+        if not isinstance(other, Line):
+            # don't attempt to compare against unrelated types
+            return NotImplemented
+
+        return (self._byte_offset == other._byte_offset
+                and self._byte_end == other._byte_end
+                and self._text == other._text
+                and self._type == other._type)
+
+    def __hash__(self):
+        # necessary for instances to behave sanely in dicts and sets.
+        return hash((self._byte_offset, self._byte_end, self._text, self._type))
+
+
+class FileModel:
+    BUFFER_SIZE = 2 ** 16  # for production use this should be at least 4096, better 64kb
+
+    def __init__(self, file: str):
+        self.file = file
+
+    def _read_line(self, file: TextIOWrapper, read_offset: int, max_line_length: int, encoding: str,
+                   previous_line_type: LineType) -> Line | None:
+        file.seek(read_offset)
+        buffer: str = file.read(self.BUFFER_SIZE)
+        if not buffer:
+            # end of file reached
+            return None
+
+        while True:
+            pos_of_newline = buffer.find(b"\n")
+            if pos_of_newline > max_line_length:
+                start_of_line = read_offset
+                end_of_line = read_offset + max_line_length - 1
+                line = buffer[0:max_line_length]
+
+                decoded_line = line.decode(encoding, errors="replace")
+                line_type = LineType.Begin if previous_line_type == LineType.End or previous_line_type == LineType.Full else LineType.Middle
+                return Line(start_of_line, end_of_line, decoded_line, line_type)
+            elif pos_of_newline >= 0:
+                start_of_line = read_offset
+                end_of_line = read_offset + pos_of_newline
+                line = buffer[0:pos_of_newline + 1]
+
+                decoded_line = line.decode(encoding, errors="replace")
+                line_type = LineType.Full if previous_line_type == LineType.End or previous_line_type == LineType.Full else LineType.End
+                return Line(start_of_line, end_of_line, decoded_line, line_type)
+
+            else:
+                # line does not end in this buffer
+                # read the next chunk and stitch the line together
+                raise "not yet implemented"
+
+    def read(self, file_offset: int, lines_to_read: int, max_line_length=512, encoding="utf8") -> [Line]:
+        lines: list[Line] = []
+        with FileWithTimeout.open(self.file, 5, 'rb') as f:
+            read_offset = max(0, file_offset - max_line_length * 6)  # factor 6 is due to multibyte characters in utf8
+            f.seek(read_offset)
+
+            previous_line_type = LineType.Full
+            while len(lines) < lines_to_read:
+                l: Line | None = self._read_line(f, read_offset, max_line_length, encoding, previous_line_type)
+                if l is None:
+                    break
+                if file_offset <= l.byte_end():
+                    lines.append(l)
+                read_offset = l.byte_end() + 1
+                previous_line_type = l.type()
+
+        return lines
+
+
+class BiggerText(QWidget):
+
+    def __init__(self, ):
+        super(BiggerText, self).__init__()
+        # font ="Andale Mono"
+        # font = "JetBrains Mono"
+        # font = "Monospace"  # not found
+        # font = "ZedMono" # is not found
+        # font = "Noto Sans Mono"
+        font = "Noto Color Emoji"
+        font_size = 20
+
+        qfont = QFont(font, font_size)
+        # qfont.setStyleHint(QFont.StyleHint.Monospace)
+        self.qfont = qfont
+
+    def mousePressEvent(self, e: QtGui.QMouseEvent) -> None:
+        if e.buttons() == Qt.MouseButton.LeftButton and e.modifiers() == Qt.KeyboardModifier.NoModifier:
+            offset = self.to_byte_offset(e.pos())
+
+            return
+
+    def to_byte_offset(self, pos: QPoint):
+        line = self.y_pos_to_line(pos.y())
+
+    def y_pos_to_line(self, y: int) -> int:
+        return int(y / self.char_height)
+
+    def paintEvent(self, event: QPaintEvent) -> None:
+        start_ns = time.process_time_ns()
+        painter = QPainter(self)
+        font = painter.font()
+        font.setPointSize(20)
+        painter.setFont(font)
+
+        font_metric: QFontMetrics = painter.fontMetrics()
+        self.char_height = font_metric.height()
+
+        lines_to_render = [
+            "im0 ひらがな 王 フーバー 🔴🟢 7²",
+            "iiiiiiiiii",
+            "１２３４５６７８",
+            "12345678",
+            "nonspacing marks:",
+            "next line consists of a%CC%88",
+            "äääääääääääääääääääääääääääääää|",
+            "アンドレアス",
+            "ｱﾝﾄﾞﾚｱｽ"
+        ]
+
+        painter.setPen(QColor(0, 0, 0))
+        line_on_screen = 1
+        for line in lines_to_render:
+            painter.drawText(QPoint(0, line_on_screen * char_height), line)
+            line_on_screen = line_on_screen + 1
+
+        painter.end()
+
+
+if __name__ == "__main__":
+    app = QApplication(sys.argv)
+
+    apply_time_workaround()
+
+    window = MainWindow()
+    window.show()
+    register_signal_handler()
+
+    app.exec()

src/new_big_text/test_file_model.py

@@ -0,0 +1,53 @@
+import unittest
+
+from src.new_big_text.bigger_text import FileModel, Line, LineType
+
+
+class FileModelTestCase(unittest.TestCase):
+    def test_read_lines_with_offset_0(self):
+        fm = FileModel("testdata/readlines.txt")
+        actual_lines = fm.read(file_offset=0, lines_to_read=5, max_line_length=16, encoding="utf8")
+        self.assertEqual([
+            Line(0, 1, '1\n'),
+            Line(2, 4, '12\n'),
+            Line(5, 8, '123\n'),
+            Line(9, 13, '1234\n'),
+            Line(14, 19, '12345\n')
+        ],
+            actual_lines)
+
+    def test_read_lines_with_offset_in_middle_of_line(self):
+        fm = FileModel("testdata/readlines.txt")
+        file_offset = "1\n12\n123\n".find("123") + 1
+        actual_lines = fm.read(
+            file_offset=file_offset,  # at char 2 in line 3
+            lines_to_read=5,
+            max_line_length=16,
+            encoding="utf8")
+        self.assertEqual([
+            Line(5, 8, '123\n'),
+            Line(9, 13, '1234\n'),
+            Line(14, 19, '12345\n'),
+            Line(20, 26, '123456\n'),
+            Line(27, 34, '1234567\n')
+        ],
+            actual_lines)
+
+    def test_read_long_line__buffer_larger_than_line(self):
+        fm = FileModel("testdata/longLines.txt")
+        fm.BUFFER_SIZE = 512
+        actual_lines = fm.read(
+            file_offset=0,
+            lines_to_read=3,
+            max_line_length=10,
+            encoding="utf8"
+        )
+        self.assertEqual([
+            Line(0, 9, "1aaaaaaaa-", LineType.Begin),
+            Line(10, 19, "bbbbbbbbb-", LineType.Middle),
+            Line(20, 27, "ccccccc\n", LineType.End),
+        ], actual_lines)
+
+
+if __name__ == '__main__':
+    unittest.main()

src/plugins/domain/menucontribution.py

@@ -55,9 +55,9 @@ def _new_recursive(current_action_id: str, items: [MenuContribution]) -> [MenuCo
     for item in items:
 
         mc: MenuContribution = item
-        print("%s checking %s" % (current_action_id, mc.action_id))
+        # print("%s checking %s" % (current_action_id, mc.action_id))
         if mc.after == current_action_id:
-            print("%s adding %s" % (current_action_id, mc.action_id))
+            #print("%s adding %s" % (current_action_id, mc.action_id))
             result.append(mc)
             result = result + _new_recursive(mc.action_id, items)
 
@@ -65,7 +65,7 @@ def _new_recursive(current_action_id: str, items: [MenuContribution]) -> [MenuCo
 
 
 def _recursive_half_order_adder(result: [MenuContribution], items: [MenuContribution]):
-    print("%s -- %s" % ([mc.action_id for mc in result], [mc.action_id for mc in items]))
+    #print("%s -- %s" % ([mc.action_id for mc in result], [mc.action_id for mc in items]))
     for item in items:
         mc: MenuContribution = item
         if mc.after:

src/plugins/logfile/filterwidget.py

@@ -38,7 +38,8 @@ class FilterTask(QRunnable):
             on_before: Callable[[], None],
             on_finish: Callable[[], None],
             show_only_matches: bool,
-            matches_separator: str
+            matches_separator: str,
+            zoned_plugin_registry: ZonedPluginRegistry
     ):
         super(FilterTask, self).__init__()
         self.source_model = source_model
@@ -53,6 +54,7 @@ class FilterTask(QRunnable):
         self.filter_match_found_listeners = filter_match_found_listeners
         self.show_only_matches = show_only_matches
         self.matches_separator = matches_separator
+        self.zoned_plugin_registry = zoned_plugin_registry
 
     def only_matches(self, line: str, regex: re.Pattern):
         result = ""
@@ -87,7 +89,10 @@ class FilterTask(QRunnable):
                 listener(-1, -1)  # notify listeners that a new search started
 
             hits_count = 0
+            hits_positions: set[float] = set(())
+            self.zoned_plugin_registry.execute("update_hit_positions", hits_positions)
             last_progress_report = time.time()
+            source_file_size = self.source_model.byte_count()
             try:
                 with open(self.source_model.get_file(), "rb") as source:
                     source.seek(self.source_model.range_start)
@@ -121,6 +126,12 @@ class FilterTask(QRunnable):
                                     target.write(line.encode("utf8"))
                                 hits_count = hits_count + 1
 
+                                hits_positions_before = len(hits_positions)
+                                hits_positions.add(round(source_line_offset / source_file_size, 3))
+                                hits_positions_after = len(hits_positions)
+                                if hits_positions_before != hits_positions_after:
+                                    self.zoned_plugin_registry.execute("update_hit_positions", hits_positions)
+
                             # sometime buffering can hide results for a while
                             # We force a flush periodically.
                             if line_count % 10000 == 0:
@@ -225,7 +236,7 @@ class FilterWidget(QWidget):
 
         (handle, self.tmp_filename) = tempfile.mkstemp()
         os.close(handle)
-        self.filter_model = LogFileModel(self.tmp_filename, self.source_model.settings)
+        self.filter_model = LogFileModel(self.tmp_filename, self.source_model.settings, source_model.get_file())
         self.hits_view = BigText(self.filter_model, show_range_slider=False)
 
         self.layout.addWidget(filter_bar)
@@ -350,6 +361,7 @@ class FilterWidget(QWidget):
             lambda: self.search_is_running.emit(True),
             lambda: self.search_is_running.emit(False),
             show_only_matches,
-            self.matches_separator.text()
+            self.matches_separator.text(),
+            self._zoned_plugin_registry
         )
         QThreadPool.globalInstance().start(self.filter_task)

src/plugins/logfile/fulltabwidget.py

@@ -1,6 +1,7 @@
 from PySide6.QtWidgets import *
 from PySide6.QtCore import *
 
+from src.pluginbase import PluginBase
 from src.ui.bigtext.bigtext import BigText
 from src.plugins.logfile.filterviewsyncer import FilterViewSyncer
 from src.plugins.logfile.filterwidget import FilterWidget
@@ -17,6 +18,7 @@ class FullTabWidget(Tab):
         self._model = model
         self._zoned_plugin_registry = zoned_plugin_registry
         self.file_view = BigText(model)
+        self._zoned_plugin_registry.register_plugin("TabWidgetPlugin", TabWidgetPlugin(self.file_view))
         self.filter_hit_view = FilterWidget(self._model, self._zoned_plugin_registry)
         self.filter_view_syncer = FilterViewSyncer(self.file_view)
         self.filter_hit_view.add_line_click_listener(self.filter_view_syncer.click_listener)
@@ -51,3 +53,12 @@ class FullTabWidget(Tab):
     # overriding abstract method
     def on_reveal(self):
         self.filter_hit_view.on_reveal()
+
+
+class TabWidgetPlugin(PluginBase):
+    def __init__(self, file_view: BigText):
+        super(TabWidgetPlugin, self).__init__()
+        self._file_view = file_view
+
+    def update_hit_positions(self, hit_positions: set[float]):
+        self._file_view.update_hit_positions(hit_positions)

src/ui/bigtext/BigScrollBar.py

@@ -0,0 +1,233 @@
+import enum
+
+from PySide6.QtGui import QWheelEvent
+from PySide6.QtWidgets import QWidget, QStylePainter, QStyle, QStyleOptionSlider
+from PySide6.QtCore import Qt, QSize, QEvent, QRect, QPoint, Signal, QTimer
+
+
+class BigScrollBar(QWidget):
+    value_changed = Signal(str)
+    """Signal emitted when the range slider value changes. 
+        **Note**: The value is a string and must be parsed into an int. 
+        QT's signal api only supports 32bit integers. Ints larger 
+        than 2**32-1 will overflow. Probably because there is some C/C++
+        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
+
+    scale = 10000
+
+    minimum = 0
+    value = 0
+    maximum = 100
+
+    def __init__(self):
+        super(BigScrollBar, self).__init__()
+        self.repeat_action_timer = QTimer()
+        self.repeat_action_control = QStyle.SubControl.SC_None
+        self.repeat_action_timer.setSingleShot(True)
+        self.repeat_action_timer.timeout.connect(self.execute_control)
+        self.repeat_action_timer.setInterval(50)
+
+    def setMinimum(self, min: int):
+        self.minimum = min
+        if self.value < self.minimum:
+            self.set_value(self.minimum)
+
+    def setMaximum(self, max: int):
+        self.maximum = max
+        if self.value > self.maximum:
+            self.set_value(self.maximum)
+
+    def paintEvent(self, event):
+        p = QStylePainter(self)
+        o = self.style_options()
+        # print(f"style_options: sliderPosition: {o.sliderPosition}")
+        p.drawComplexControl(QStyle.ComplexControl.CC_ScrollBar, o)
+
+    def style_options(self) -> QStyleOptionSlider:
+        o = QStyleOptionSlider()
+        o.initFrom(self)
+        o.orientation = Qt.Orientation.Vertical
+        o.subControls = QStyle.SubControl.SC_All
+
+        if self.pressedControl != QStyle.SubControl.SC_None:
+            o.activeSubControls = self.pressedControl  # QStyle.SubControl.SC_None
+            o.state = o.state | QStyle.StateFlag.State_Sunken
+
+        o.singleStep = 1
+
+        # scale values to 10000
+
+        t = self.scale / self.maximum
+        o.minimum = self.minimum * t
+        o.maximum = self.maximum * t
+        o.sliderPosition = int(self.value * t)
+        # print(f"t={t}")
+        # print(f"({self.minimun}, {self.value}, {self.maximum}) -> ({o.minimum},{o.sliderPosition},{o.maximum})")
+
+        return o
+
+    def sizeHint(self):
+        scroll_bar_extend: int = self.style().pixelMetric(QStyle.PixelMetric.PM_ScrollBarExtent)
+        scroll_bar_slider_min: int = self.style().pixelMetric(QStyle.PixelMetric.PM_ScrollBarSliderMin)
+        # print(f"scroll_bar_extend: {scroll_bar_extend}, scroll_bar_slider_min: {scroll_bar_slider_min}")
+        # for vertical
+        size = QSize(scroll_bar_extend, scroll_bar_extend * 2 + scroll_bar_slider_min)
+
+        opts = self.style_options()
+        return self.style().sizeFromContents(QStyle.ContentsType.CT_ScrollBar, opts, size, self)
+
+    def event(self, event: QEvent) -> bool:
+        # print(f"event type: {event.type()}")
+
+        if event.type() == QEvent.Type.MouseButtonPress:
+            pass
+            # print(f"mouse button pressed")
+
+        return super().event(event)
+
+    def mousePressEvent(self, event):
+
+        if self.repeat_action_timer.isActive():
+            self.stopRepeatAction()
+
+        if not (event.button() == Qt.MouseButton.LeftButton or event.button() == Qt.MouseButton.MiddleButton):
+            return
+
+        style_options = self.style_options()
+
+        self.pressedControl = self.style().hitTestComplexControl(QStyle.ComplexControl.CC_ScrollBar, style_options,
+                                                                 event.position().toPoint(), self)
+        # 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()
+        # print(f"pressYValue {pressYValue}")
+
+        if self.pressedControl == QStyle.SubControl.SC_ScrollBarSlider:
+            self.click_offset = click.y() - sr.y()
+            self.snap_back_position = self.value
+
+        if (self.pressedControl == QStyle.SubControl.SC_ScrollBarAddPage
+            or self.pressedControl == QStyle.SubControl.SC_ScrollBarSubPage) \
+                and event.button() == Qt.MouseButton.MiddleButton:
+            slider_length = sr.height()
+            self.set_value(self.pixelPosToRangeValue(event.position().toPoint().y()))
+            self.pressedControl = QStyle.SubControl.SC_ScrollBarSlider
+            self.click_offset = slider_length / 2
+            return
+
+        self.repeat_action_control = self.pressedControl
+        self.execute_control()
+        # self.repaint(self.style().subControlRect(QStyle.ComplexControl.CC_ScrollBar, style_options, self.pressedControl))
+
+    def execute_control(self):
+        # print(f"execute_control: {self.repeat_action_control}")
+        trigger_repeat_action = True
+        match self.repeat_action_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)
+                if self.value <= self.minimum:
+                    trigger_repeat_action = False
+            case QStyle.SubControl.SC_ScrollBarAddLine:
+                self.scroll_event.emit(self.ScrollEvent.LinesDown)
+            case QStyle.SubControl.SC_ScrollBarSubLine:
+                self.scroll_event.emit(self.ScrollEvent.LinesUp)
+                if self.value <= self.minimum:
+                    trigger_repeat_action = False
+            case QStyle.SubControl.SC_ScrollBarFirst:
+                self.set_value(self.minimum)
+                trigger_repeat_action = False
+            case QStyle.SubControl.SC_ScrollBarLast:
+                self.set_value(self.maximum)
+                trigger_repeat_action = False
+            case _:
+                trigger_repeat_action = False
+
+        if trigger_repeat_action:
+            # print(f"schedule repeat action: {self.repeat_action_control}")
+            self.repeat_action_timer.start()
+
+    def mouseReleaseEvent(self, event):
+        self.pressedControl = QStyle.SubControl.SC_None
+        self.stopRepeatAction()
+
+    def mouseMoveEvent(self, event):
+        if self.pressedControl == QStyle.SubControl.SC_None:
+            return
+
+        if self.pressedControl == QStyle.SubControl.SC_ScrollBarSlider:
+            click: QPoint = event.position().toPoint()
+            new_position = self.pixelPosToRangeValue(click.y() - self.click_offset)
+            m = self.style().pixelMetric(QStyle.PixelMetric.PM_MaximumDragDistance, self.style_options(), self)
+            if m >= 0:
+                r: QRect = self.rect()
+                r.adjust(-m, -m, m, m)
+                if not r.contains(event.position().toPoint()):
+                    new_position = self.snap_back_position
+
+            # print(f"move to value: {new_position}")
+            self.set_value(new_position)
+
+        # stop repeat action when pointer leaves control
+        pr: QRect = self.style().subControlRect(QStyle.ComplexControl.CC_ScrollBar, self.style_options(),
+                                                self.pressedControl, self)
+        if not pr.contains(event.position().toPoint()):
+            self.stopRepeatAction()
+
+    def wheelEvent(self, event: QWheelEvent):
+        event.ignore()
+
+        # when using a touchpad we can have simultaneous horizontal and vertical movement
+        horizontal = abs(event.angleDelta().x()) > abs(event.angleDelta().y())
+        if horizontal:
+            return
+
+        scroll_event = self.ScrollEvent.LinesDown if event.angleDelta().y() < 0 else self.ScrollEvent.LinesUp
+        self.scroll_event.emit(scroll_event)
+
+    def pixelPosToRangeValue(self, pos: int):
+        opt: QStyleOptionSlider = self.style_options()
+
+        gr: QRect = self.style().subControlRect(QStyle.ComplexControl.CC_ScrollBar, opt,
+                                                QStyle.SubControl.SC_ScrollBarGroove, self)
+        sr: QRect = self.style().subControlRect(QStyle.ComplexControl.CC_ScrollBar, opt,
+                                                QStyle.SubControl.SC_ScrollBarSlider, self)
+
+        # only for vertical scrollbars
+        slider_length = sr.height()
+        slider_min = gr.y()
+        slider_max = gr.bottom() - slider_length + 1
+
+        val = QStyle.sliderValueFromPosition(opt.minimum, opt.maximum, pos - slider_min,
+                                             slider_max - slider_min, opt.upsideDown)
+
+        t = self.scale / self.maximum
+        val = int(val / t)
+        # print(f"pixelPosToRangeValue({pos}) -> {val}")
+        return val
+
+    def stopRepeatAction(self):
+        self.repeat_action_control = QStyle.SubControl.SC_None
+        # print(f"stop repeat action: {self.repeat_action_control}")
+        self.repeat_action_timer.stop()
+        #self.update()
+
+    def set_value(self, value: int):
+        self.value = value
+        self.value_changed.emit(str(self.value))
+        self.update()

src/ui/bigtext/bigtext.py

@@ -11,6 +11,7 @@ from PySide6.QtGui import QMouseEvent
 from PySide6.QtWidgets import *
 
 from src.ui.ScaledScrollBar import ScaledScrollBar
+from src.ui.bigtext.BigScrollBar import BigScrollBar
 from src.ui.bigtext.highlight_regex import HighlightRegex
 from src.ui.bigtext.highlight_selection import HighlightSelection
 from src.ui.bigtext.highlighted_range import HighlightedRange
@@ -77,6 +78,7 @@ class BigText(QWidget):
     def __init__(self, model: LogFileModel, show_range_slider=True):
         super(BigText, self).__init__()
 
+        self.show_range_slider = show_range_slider
         self.model = model
 
         self.grid = QGridLayout()
@@ -85,12 +87,9 @@ class BigText(QWidget):
         self.grid.setVerticalSpacing(0)
         self.setLayout(self.grid)
 
-        self.v_scroll_bar = ScaledScrollBar()
+        self.v_scroll_bar = BigScrollBar()
 
-        self.range_limit = RangeSlider()
+        self.big_text = InnerBigText(self, model, self.v_scroll_bar)
-        self.range_limit.value_changed.connect(self._range_limit_event)
-
-        self.big_text = InnerBigText(self, model, self.v_scroll_bar, self.range_limit)
         self.big_text.setSizePolicy(QSizePolicy(QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Expanding))
 
         self.h_scroll_bar = QScrollBar(Qt.Orientation.Horizontal)
@@ -99,12 +98,12 @@ 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.scaledValueChanged.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.scrolled_to_end.connect(self.big_text.v_scroll_update_follow_tail)
+        self.v_scroll_bar.scroll_event.connect(self.big_text.v_scroll_event)
-
-
 
         if show_range_slider:
+            self.range_limit = RangeSlider()
+            self.range_limit.value_changed.connect(self._range_limit_event)
             self.grid.addWidget(self.range_limit, 0, 0)
         self.grid.addWidget(self.big_text, 0, 1)
         self.grid.addWidget(self.h_scroll_bar, 1, 1)
@@ -121,6 +120,10 @@ class BigText(QWidget):
     def get_file(self):
         return self.model.get_file()
 
+    def update_hit_positions(self, hit_positions: set[float]):
+        if self.range_limit:
+            self.range_limit.update_hit_positions(hit_positions)
+
     def add_line_click_listener(self, listener: Callable[[int], None]):
         """
         :param listener: a callable, the parameter is the byte offset of the clicked line
@@ -149,14 +152,12 @@ class InnerBigText(QWidget):
     _range_start = 0
     _range_end = -1
 
-    def __init__(self, parent: BigText, model: LogFileModel, v_scaled_scrollbar: ScaledScrollBar,
+    def __init__(self, parent: BigText, model: LogFileModel, v_scaled_scrollbar: ScaledScrollBar):
-                 range_limit: RangeSlider):
         super(InnerBigText, self).__init__()
         self.char_height = None
         self.char_width = None
         self.model = model
         self._v_scaled_scrollbar = v_scaled_scrollbar
-        self._range_limit = range_limit
         self.parent = parent
         self.setFocusPolicy(Qt.FocusPolicy.StrongFocus)
         self.setFocusPolicy(Qt.FocusPolicy.WheelFocus)
@@ -169,8 +170,6 @@ class InnerBigText(QWidget):
         self._last_double_click_time = 0
         self._last_double_click_line_number = -1
 
-        self._follow_tail = False
-
         self.highlight_selected_text = HighlightRegex(
             "",
             is_regex=False,
@@ -219,7 +218,6 @@ class InnerBigText(QWidget):
         elif e.modifiers() == Qt.KeyboardModifier.ControlModifier and e.key() == 65:  # ctrl + a
             self._select_all()
 
-
     def wheelEvent(self, event: QWheelEvent):
         direction = 1 if event.angleDelta().y() < 0 else -1
         if event.modifiers() == Qt.KeyboardModifier.ControlModifier:
@@ -262,30 +260,31 @@ class InnerBigText(QWidget):
         manage_highlighting.setShortcut("CTRL+H")
         menu.addAction(manage_highlighting)
 
-        menu.addSeparator()
+        if self.parent.show_range_slider:
+            menu.addSeparator()
 
-        set_range_start = QAction(
+            set_range_start = QAction(
-            Icon("icons/myicons/range-start.svg"),
+                Icon("icons/myicons/range-start.svg"),
-            _("Set Range Start"),
+                _("Set Range Start"),
-            self,
+                self,
-            triggered=lambda: self._set_range_start_by_y_pos(position.y())
+                triggered=lambda: self._set_range_start_by_y_pos(position.y())
-        )
+            )
-        menu.addAction(set_range_start)
+            menu.addAction(set_range_start)
 
-        set_range_end = QAction(
+            set_range_end = QAction(
-            Icon("icons/myicons/range-end.svg"),
+                Icon("icons/myicons/range-end.svg"),
-            _("Set Range End"),
+                _("Set Range End"),
-            self,
+                self,
-            triggered=lambda: self._set_range_end_by_y_pos(position.y())
+                triggered=lambda: self._set_range_end_by_y_pos(position.y())
-        )
+            )
-        menu.addAction(set_range_end)
+            menu.addAction(set_range_end)
 
-        reset_range = QAction(
+            reset_range = QAction(
-            _("Reset Range"),
+                _("Reset Range"),
-            self,
+                self,
-            triggered=lambda: self._reset_range()
+                triggered=lambda: self._reset_range()
-        )
+            )
-        menu.addAction(reset_range)
+            menu.addAction(reset_range)
 
         menu.exec(self.mapToGlobal(position))
 
@@ -311,12 +310,12 @@ class InnerBigText(QWidget):
     def scroll_by_lines(self, scroll_lines: int):
         self.scroll_lines = scroll_lines
         self.update()
-        self.parent.v_scroll_bar.setValue(self._byte_offset)
+        self.parent.v_scroll_bar.set_value(self._byte_offset)
 
     def scroll_to_byte(self, byte_offset: int):
         self._byte_offset = min(byte_offset, self.model.byte_count())
         self.update()
-        self.parent.v_scroll_bar.setValue(self._byte_offset)
+        self.parent.v_scroll_bar.set_value(self._byte_offset)
 
     # noinspection PyTypeChecker
     def mousePressEvent(self, e: QtGui.QMouseEvent) -> None:
@@ -401,13 +400,21 @@ 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_update_follow_tail(self, scrolled_to_end: bool):
+    def v_scroll_event(self, event: BigScrollBar.ScrollEvent):
-        self._follow_tail = scrolled_to_end
+        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
@@ -491,7 +498,7 @@ class InnerBigText(QWidget):
             (selected_file, _filter) = dialog.getSaveFileName(
                 parent=self,
                 caption=_("Save File"),
-                dir=os.path.dirname(self.model.get_file())
+                dir=os.path.dirname(self.model.get_original_file())
             )
             if selected_file:
                 self.model.write_range(start, end, selected_file)
@@ -533,13 +540,10 @@ class InnerBigText(QWidget):
             PluginRegistry.execute("update_status_bar", "")
 
     def _file_changed(self):
-        if self._follow_tail:
-            self.scroll_to_byte(self.model.byte_count())
         self.update()
 
     def paintEvent(self, event: QPaintEvent) -> None:
         start_ns = time.process_time_ns()
-        # print(f"paint {self.model.get_file()} at {self._byte_offset} with follow_tail={self._follow_tail}")
         painter = QPainter(self)
         # font = "Courier New" if sys.platform == 'win32' or sys.platform == 'cygwin' else "Monospace"
         painter.setFont(QFont("Courier New", self.model.settings.getint_session('general', "font_size")))
@@ -559,7 +563,8 @@ class InnerBigText(QWidget):
         byte_count = self.model.byte_count()
         vmax = byte_count - 1 if self._range_end < 0 else min(self._range_end, self.model.byte_count() - 1)
         self.parent.v_scroll_bar.setMaximum(vmax)
-        self.parent.range_limit.set_maximum(byte_count)
+        if self.parent.show_range_slider:
+            self.parent.range_limit.set_maximum(byte_count)
 
         for line in self.lines:
             self.update_longest_line(len(line.line()))

src/ui/bigtext/highlight_regex.py

@@ -1,3 +1,4 @@
+import fnmatch
 from typing import Optional
 
 from src.ui.bigtext.highlight import Highlight
@@ -12,7 +13,7 @@ import re
 class HighlightRegex(Highlight):
 
     def __init__(self, query: str, ignore_case: bool, is_regex: bool, hit_background_color: str = "None",
-                 line_background_color: str = "None", active: bool = True):
+                 line_background_color: str = "None", active: bool = True, activated_for_file_type: str = "*"):
         self.active = active
         self.query = query
         self.ignore_case = ignore_case
@@ -20,6 +21,7 @@ class HighlightRegex(Highlight):
         self.regex = self._get_regex()
         self.hit_background_color = hit_background_color
         self.line_background_color = line_background_color
+        self.activated_for_file_type = activated_for_file_type
         self._brush_hit = self.brush(self.hit_background_color)
         self._brush_line = self.brush(self.line_background_color)
 
@@ -99,3 +101,15 @@ class HighlightRegex(Highlight):
             alpha = int(color[6:8], 16)
             return QBrush(QColor(red, green, blue, alpha))
         return QBrush()
+
+    def set_activated_for_file_type(self, activated_for_file_type: str):
+        self.activated_for_file_type = activated_for_file_type
+
+    def file_type_matches(self, file_name: str) -> bool:
+        if self.activated_for_file_type is None or len(self.activated_for_file_type) == 0:
+            return True
+        glob_patterns: [str] = self.activated_for_file_type.split(",")  # support multiple globs like: "*.txt, *.csv"
+        for glob_pattern in glob_patterns:
+            if fnmatch.fnmatch(file_name, glob_pattern.strip()):
+                return True
+        return False

src/ui/bigtext/highlighting.py

@@ -25,6 +25,7 @@ class Highlighting:
             is_regex = session.getboolean(section, "is-regex", fallback=False)
             line_background_color = session.get(section, "line.background.color", fallback="None")
             hit_background_color = session.get(section, "hit.background.color", fallback="None")
+            activated_for_file_type = session.get(section, "activated-for-file-type", fallback="*")
 
             try:
                 highlight = HighlightRegex(
@@ -33,7 +34,8 @@ class Highlighting:
                     is_regex=is_regex,
                     hit_background_color=hit_background_color,
                     line_background_color=line_background_color,
-                    active=active
+                    active=active,
+                    activated_for_file_type=activated_for_file_type
                 )
                 result.append(highlight)
             except:
@@ -57,6 +59,7 @@ class Highlighting:
             settings.session.set(section, "is-regex", str(highlighter.is_regex))
             settings.session.set(section, "line.background.color", highlighter.line_background_color)
             settings.session.set(section, "hit.background.color", highlighter.hit_background_color)
+            settings.session.set(section, "activated-for-file-type", highlighter.activated_for_file_type)
 
     @staticmethod
     def remove_highlighting_sections(settings: Settings):

src/ui/bigtext/line.py

@@ -116,7 +116,7 @@ class Line:
             # todo there are many other character combinations that should be skipped
             while i < len(self._line) and unicodedata.category(self._line[i]) == "Mn":
                 self._char_to_column_cache[i] = result - 1
-                if not result in self._column_to_char_cache:
+                if (result - 1) not in self._column_to_char_cache:
                     self._column_to_char_cache[result - 1] = i
                 i = i + 1
 

src/ui/bigtext/logFileModel.py

@@ -7,6 +7,7 @@ from src.ui.bigtext.highlighting import Highlighting
 from src.ui.bigtext.line import Line
 import os
 from src.settings.settings import Settings
+from functools import lru_cache
 
 
 class LogFileModel:
@@ -21,21 +22,32 @@ class LogFileModel:
     range_start = 0
     range_end = -1
 
-    def __init__(self, file: str, settings: Settings):
+    def __init__(self, file: str, settings: Settings, original_file: str = False):
+        """
+        :param file:
+        :param settings:
+        :param original_file: used in the filter widget to denote the original file, the one being filtered, because 'file' points to the tmp file
+        """
         self.settings = settings
         self._file = os.path.realpath(file)
+        self._original_file = os.path.realpath(original_file) if original_file else self._file
+        self._file_name = os.path.basename(self._original_file)
+        self._line_cache = {}
 
     def highlighters(self):
         all_highlighters = Highlighting.read_config(self.settings)
         active_highlighters = []
         for h in all_highlighters:
-            if h.is_active():
+            if h.is_active() and h.file_type_matches(self._file_name):
                 active_highlighters.append(h)
         return active_highlighters
 
     def get_file(self):
         return self._file
 
+    def get_original_file(self):
+        return self._original_file
+
     def __str__(self):
         return self._file
 
@@ -123,6 +135,14 @@ class LogFileModel:
     def _is_word_char(self, char: str) -> bool:
         return re.match(r"\w", char) is not None
 
+    def prune_cache(self, range_start: int, range_end: int):
+        print(f"cache size: {len(self._line_cache.keys())}")
+        for key in list(self._line_cache.keys()):
+            line = self._line_cache[key]
+            if range_start > line.byte_end() or line.byte_offset() > range_end:
+                del self._line_cache[key]
+
+
     def data(self, byte_offset: int, scroll_lines: int, lines: int, range_start: int, range_end: int) -> List[Line]:
         # print("data(%s, %s, %s)" % (byte_offset, scroll_lines, lines))
         lines_before_offset: List[Line] = []
@@ -138,19 +158,36 @@ class LogFileModel:
             offset = max(0,
                          max(range_start - self.settings.max_line_length(), offset - self.settings.max_line_length()))
 
+            self.prune_cache(range_start, range_end)
+
+            previous_line_is_complete = False
             f.seek(offset)
-            while l := f.readline():
+            while True:
-                new_offset = f.tell()
+                line: Line | None = self._line_cache.get(offset)
-                if 0 <= range_end < new_offset:
+                if line is None:
-                    break
+                    line_bytes = f.readline()
-                line = Line(offset, new_offset, l.decode("utf8", errors="ignore"))
+                    if not line_bytes:
+                        break
+                    new_offset = f.tell()
+                    if 0 <= range_end < new_offset:
+                        break
+                    line = Line(offset, new_offset, line_bytes.decode("utf8", errors="ignore"))
+                    if previous_line_is_complete:  # only cache lines when we know they are complete
+                        self._line_cache[offset] = line
+                    offset = new_offset
+                    previous_line_is_complete = True
+                else:
+                    # print(f"loaded cached line at offset {offset}")
+                    offset = line.byte_end()  # line.byte_end() returns the end byte +1
+                    f.seek(offset)
+                    previous_line_is_complete = True
 
                 if line.byte_end() <= byte_offset:  # line.byte_end() returns the end byte +1
                     if line.byte_offset() >= range_start:  # only add if in range
                         lines_before_offset.append(line)
                 else:
                     lines_after_offset.append(line)
-                offset = f.tell()
+
                 if len(lines_after_offset) >= lines_to_find:
                     break
 

src/ui/bigtext/newhighlightingdialog.py

@@ -118,7 +118,7 @@ class NewHighlightingDialog(QDialog):
 
     def _new_highlighter(self):
         highlight_regex = HighlightRegex("", ignore_case=True, is_regex=True, hit_background_color="ccb400",
-                                         line_background_color="fff080")
+                                         line_background_color="None")
         self._add_highlight_regex_to_list(highlight_regex, select=True)
 
 
@@ -139,7 +139,7 @@ class HighlightListItemWidget(QWidget):
         self.active = QCheckBox("")
         self.active.setChecked(highlight_regex.is_active())
         self.active.stateChanged.connect(self._change_active_state)
-        self.layout.addWidget(self.active, row, 0, 3, 1, alignment=QtCore.Qt.AlignmentFlag.AlignVCenter)
+        self.layout.addWidget(self.active, row, 0, 4, 1, alignment=QtCore.Qt.AlignmentFlag.AlignVCenter)
 
         query = QLineEdit(self)
         query.setText(highlight_regex.query)
@@ -181,6 +181,18 @@ class HighlightListItemWidget(QWidget):
         is_regex.setEnabled(highlight_regex.is_active())
         self.layout.addWidget(is_regex, row, 3)
 
+        row = row + 1
+        activated_for_file_type_label = QLabel(_("File Type:"), self)
+        activated_for_file_type_label.setEnabled(highlight_regex.is_active())
+        self.layout.addWidget(activated_for_file_type_label, row, 1)
+        activated_for_file_type = QLineEdit(self)
+        activated_for_file_type.setEnabled(highlight_regex.is_active())
+        activated_for_file_type.setText(highlight_regex.activated_for_file_type)
+        activated_for_file_type.textChanged[str].connect(
+            lambda: highlight_regex.set_activated_for_file_type(activated_for_file_type.text()))
+        self.layout.addWidget(activated_for_file_type, row, 2)
+
+
     def _change_active_state(self):
         active = self.active.isChecked()
         self.highlight_regex.set_active(active)

src/ui/bigtext/testline.py

@@ -31,9 +31,9 @@ class MyTestCase(unittest.TestCase):
         self.assertEqual(9, line.column_to_char(15))  # tab
         self.assertEqual(10, line.column_to_char(16))  # g
 
-    def test_column_to_char_ignore_nonspacing_mark_charaters(self):
+    def test_column_to_char_ignore_nonspacing_mark_characters(self):
         """
-        nonspacing mark charaters are those little decorations that are applied to the previous character,
+        nonspacing mark characters are those little decorations that are applied to the previous character,
         e.g. x\u0308 to make ẍ
         :return:
         """
@@ -63,7 +63,7 @@ class MyTestCase(unittest.TestCase):
 
     def test_char_to_column_ignore_nonspacing_mark_charaters(self):
         """
-        nonspacing mark charaters are those little decorations that are applied to the previous character,
+        nonspacing mark characters are those little decorations that are applied to the previous character,
         e.g. x\u0308 to make ẍ
         :return:
         """
@@ -119,7 +119,7 @@ class MyTestCase(unittest.TestCase):
         for i in range(128):
             if unicodedata.category(chr(i)) == "Cc":
                 # print(i, " -> ", ord(chr(i)), " --> ", chr(9216 + i))
-                if not i in [9, 10, 11, 13]:
+                if i not in [9, 10, 11, 13]:
                     text = text + chr(i)
 
         line = Line(byte_offset=byte_offset, byte_end=byte_offset + len(text.encode("utf8")), line=text)

src/ui/rangeslider.py

@@ -4,7 +4,7 @@ from enum import Enum
 import PySide6
 from PySide6 import QtGui
 from PySide6.QtCore import QRect, QPoint, Signal
-from PySide6.QtGui import QPainter, Qt
+from PySide6.QtGui import QPainter, Qt, QColor, QPen
 from PySide6.QtWidgets import QWidget
 
 from src.pluginregistry import PluginRegistry
@@ -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 +52,8 @@ class RangeSlider(QWidget):
 
         self.selected_handle = None
         self.selection_drag_range = (self.min_value, self.max_value)
+        self.drag_y_offset_in_handle = 0
+        self._hit_positions: set[float] = set(())
 
     def set_maximum(self, max: int):
         if self.max_value == max:
@@ -66,14 +66,16 @@ class RangeSlider(QWidget):
             self.upper_value.value = max
             self._emit_value_changed()
 
+    def update_hit_positions(self, hit_positions: set[float]):
+        # print(f"updated hit positions in range slider:{len(hit_positions)} -> {hit_positions}")
+        self._hit_positions = hit_positions
+
     def paintEvent(self, event: PySide6.QtGui.QPaintEvent) -> None:
         painter = QPainter(self)
         self._draw_background(painter)
-        if self.draw_ticks:
+        self._draw_hits(painter)
-            self._draw_ticks(painter)
         self._draw_handle(painter, self.lower_value)
         self._draw_handle(painter, self.upper_value, direction=-1)
-
         painter.end()
 
     def _draw_background(self, painter: QPainter) -> None:
@@ -90,19 +92,6 @@ 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)
 
@@ -127,6 +116,25 @@ class RangeSlider(QWidget):
         pixel = (self.height() - 2 * self._handle_width) * value_percent + self._handle_width
         return pixel
 
+    def _draw_hits(self, painter: QPainter) -> None:
+        color = to_qcolor("000000")
+        color.setAlpha(192)
+        pen = QPen(color)
+        pen.setWidth(1)
+        painter.setPen(pen)
+
+        # compute where to draw a line and then deduplicate then, so that we don't draw lines multiple times
+        # this is for performance and because we use transparency and drawing a line multiple times would make it
+        # darker
+        paint_at_y_positions: set[int] = set(())
+        for hit_position in self._hit_positions:
+            y = (self.height() - 2 * self._handle_width) * hit_position + self._handle_width
+            y = round(y)
+            paint_at_y_positions.add(y)
+
+        for y in paint_at_y_positions:
+            painter.drawLine(2, y, 18, y)
+
     def _pixel_to_value(self, pixel: int) -> int:
         pixel_percent = (pixel - self._handle_width) / (self.height() - 2 * self._handle_width)
         return int(math.floor(self.max_value * pixel_percent))
@@ -144,9 +152,11 @@ 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 +164,7 @@ 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))

src/util/color.py

@@ -7,12 +7,22 @@ def is_hex_color(color: str):
     return re.match("[0-9a-f]{6}", color, flags=re.IGNORECASE)
 
 
+def is_hex_color_with_alpha(color: str):
+    return re.match("[0-9a-f]{8}", color, flags=re.IGNORECASE)
+
+
 def to_qcolor(color: str):
     if is_hex_color(color):
         red = int(color[0:2], 16)
         green = int(color[2:4], 16)
         blue = int(color[4:6], 16)
         return QColor(red, green, blue)
+    if is_hex_color_with_alpha(color):
+        red = int(color[0:2], 16)
+        green = int(color[2:4], 16)
+        blue = int(color[4:6], 16)
+        alpha = int(color[6:8], 16)
+        return QColor(red, green, blue, alpha)
     elif color in QColor().colorNames():
         return QColor(color)
     return QColor(255, 255, 255)