ScanSlicer/scanslicer/ui_builders_shared.py

import base64

from PySide6.QtCore import QPoint, QRect, Qt
from PySide6.QtGui import QFont, QFontInfo, QIcon, QPainter, QPixmap
from PySide6.QtSvg import QSvgRenderer
from PySide6.QtWidgets import (
    QComboBox,
    QGridLayout,
    QGroupBox,
    QHBoxLayout,
    QLabel,
    QPushButton,
    QScrollArea,
    QSizePolicy,
    QSlider,
    QSpacerItem,
    QVBoxLayout,
    QWidget,
)


# _icon_color_from_palette: function definition for ScanSlicer behavior.
def _icon_color_from_palette(palette):
    if palette is None:
        return "#f2f2f2"

    button_text_color = palette.buttonText().color()
    if button_text_color.isValid():
        return button_text_color.name()

    window_color = palette.window().color()
    luma = (
        (0.2126 * window_color.redF())
        + (0.7152 * window_color.greenF())
        + (0.0722 * window_color.blueF())
    )
    return "#1f1f1f" if luma >= 0.5 else "#f2f2f2"


# icon_from_svg_data_url: function definition for ScanSlicer behavior.
def icon_from_svg_data_url(data_url, size=24, color_hex=None, palette=None):
    prefix = "data:image/svg+xml;base64,"
    if not data_url.startswith(prefix):
        return None

    try:
        svg_bytes = base64.b64decode(data_url[len(prefix):], validate=True)
    except Exception:
        return None

    if color_hex is None:
        color_hex = _icon_color_from_palette(palette)

    # Most toolbar SVGs use "currentColor"; replace it with the resolved color.
    if color_hex:
        try:
            svg_text = svg_bytes.decode("utf-8")
            svg_text = svg_text.replace("currentColor", color_hex)
            svg_text = svg_text.replace("currentcolor", color_hex)
            svg_bytes = svg_text.encode("utf-8")
        except UnicodeDecodeError:
            pass

    renderer = QSvgRenderer(svg_bytes)
    if not renderer.isValid():
        return None

    pixmap = QPixmap(size, size)
    pixmap.fill(Qt.GlobalColor.transparent)
    painter = QPainter(pixmap)
    renderer.render(painter)
    painter.end()
    return QIcon(pixmap)


# ScrollbarWheelOnlyScrollArea: class definition for ScanSlicer behavior.
class ScrollbarWheelOnlyScrollArea(QScrollArea):
    # wheelEvent: function definition for ScanSlicer behavior.
    def wheelEvent(self, event):
        scrollbar = self.verticalScrollBar()
        if scrollbar is None or not scrollbar.isVisible():
            event.ignore()
            return

        global_pos = event.globalPosition().toPoint()
        scrollbar_rect = QRect(scrollbar.mapToGlobal(QPoint(0, 0)), scrollbar.size())
        if not scrollbar_rect.contains(global_pos):
            event.ignore()
            return

        super().wheelEvent(event)