PySide6 QToolButton 字体Bug分析#

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QFont::setPointSize: Point size <= 0 (-1), must be greater than 0

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"""
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PySide6 QToolButton Font Bug Test
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Demonstrates the font issue with QToolButton in PySide6 6.10.1+
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"""
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import sys
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import PySide6
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from PySide6.QtCore import Qt
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from PySide6.QtGui import QFont
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from PySide6.QtWidgets import QApplication, QWidget, QVBoxLayout, QToolButton, QLabel
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class SimpleTestWidget(QWidget):
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    """ Simple test interface for PySide6 font bug """
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    def __init__(self, parent=None):
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        super().__init__(parent)
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        self.setup_ui()
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    def setup_ui(self):
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        layout = QVBoxLayout(self)
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        layout.setSpacing(20)
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        # Title with version info
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        title = QLabel("PySide6 Version: " + PySide6.__version__ + " - QToolButton Font Bug Test")
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        title.setAlignment(Qt.AlignCenter)
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        title.setStyleSheet("font-size: 16px; font-weight: bold;")
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        layout.addWidget(title)
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        # QToolButton with setPixelSize (no stylesheet)
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        pixel_button_no_style = QToolButton(self)
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        pixel_button_no_style.setText("setPixelSize(14) - No Stylesheet")
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        font_pixel = QFont()
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        font_pixel.setFamilies(['Segoe UI', 'Microsoft YaHei'])
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        font_pixel.setPixelSize(14)  # Using setPixelSize
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        pixel_button_no_style.setFont(font_pixel)
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        layout.addWidget(pixel_button_no_style)
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        # QToolButton with setPixelSize (with stylesheet) - BUG APPEARS HERE
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        pixel_button_with_style = QToolButton(self)
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        pixel_button_with_style.setText("setPixelSize(14) - With Stylesheet (BUG)")
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        font_pixel2 = QFont()
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        font_pixel2.setFamilies(['Segoe UI', 'Microsoft YaHei'])
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        font_pixel2.setPixelSize(14)  # Using setPixelSize
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        pixel_button_with_style.setFont(font_pixel2)
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        # Apply stylesheet (simulates the bug condition)
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        style_sheet = """
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        QToolButton {
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            background: rgba(255, 255, 255, 0.7);
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            border: 1px solid rgba(0, 0, 0, 0.073);
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            border-radius: 5px;
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            padding: 5px 12px 6px 12px;
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        }
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        """
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        pixel_button_with_style.setStyleSheet(style_sheet)
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        layout.addWidget(pixel_button_with_style)
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        # QToolButton with setPointSize (with stylesheet) - WORKAROUND
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        point_button_with_style = QToolButton(self)
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        point_button_with_style.setText("setPointSize(10) - With Stylesheet (Workaround)")
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        font_point = QFont()
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        font_point.setFamilies(['Segoe UI', 'Microsoft YaHei'])
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        font_point.setPointSize(10)  # Using setPointSize (workaround)
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        point_button_with_style.setFont(font_point)
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        point_button_with_style.setStyleSheet(style_sheet)
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        layout.addWidget(point_button_with_style)
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        style_sheet2 = """
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        QToolButton {
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            background: rgba(255, 255, 255, 0.7);
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            border: 1px solid rgba(0, 0, 0, 0.073);
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            border-radius: 5px;
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            padding: 5px 12px 6px 12px;
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            font-size: 14px;
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        }
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        """
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        point_button_with_style2 = QToolButton(self)
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        point_button_with_style2.setText("setPointSize(10) - With Stylesheet and set Font-size (bug)")
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        font_point2 = QFont()
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        font_point2.setFamilies(['Segoe UI', 'Microsoft YaHei'])
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        font_point2.setPointSize(10)
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        point_button_with_style2.setFont(font_point2)
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        point_button_with_style2.setStyleSheet(style_sheet2)
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        layout.addWidget(point_button_with_style2)
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        # Instructions
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        desc = QLabel("Hover mouse over buttons to test the font bug.")
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        desc.setStyleSheet("color: gray; font-size: 12px;")
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        layout.addWidget(desc)
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        self.resize(500, 350)
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if __name__ == "__main__":
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    app = QApplication(sys.argv)
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    window = SimpleTestWidget()
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    window.setWindowTitle("PySide6 QToolButton Font Bug Test")
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    window.show()
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    sys.exit(app.exec())