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Custom QProxyStyle for visible arrows on dark themes, widen Library btn

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- QProxyStyle overrides drawPrimitive to draw arrow triangles in
  the theme's text color (extracted from QSS)
- Works for spinbox up/down and combobox dropdown arrows
- Cross-platform, no SVG resources needed
- Library button widened to 80px to prevent text clipping
This commit is contained in:
pax 2026-04-05 05:38:34 -05:00
parent 0ec72f41fa
commit 76c25aa892
1 changed files with 44 additions and 20 deletions
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64
booru_viewer/gui/app.py
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@ -327,7 +327,7 @@ class BooruApp(QMainWindow):
self._library_btn = QPushButton("Library")
self._library_btn.setCheckable(True)
self._library_btn.setFixedWidth(60)
self._library_btn.setFixedWidth(80)
self._library_btn.clicked.connect(lambda: self._switch_view(2))
nav.addWidget(self._library_btn)
@ -1806,30 +1806,54 @@ def run() -> None:
custom_css = data_dir() / "custom.qss"
if custom_css.exists():
try:
# Use Fusion style so QSS has full control over rendering
app.setStyle("Fusion")
css_text = custom_css.read_text()
app.setStyleSheet(css_text)
# Extract colors from QSS and apply to palette for Fusion
# Use Fusion style with arrow color fix
from PySide6.QtWidgets import QProxyStyle
from PySide6.QtGui import QPalette, QColor, QPainter as _P
from PySide6.QtCore import QPoint as _QP
import re
from PySide6.QtGui import QPalette, QColor
css_text = custom_css.read_text()
# Extract text color for arrows
m = re.search(r'QWidget\s*\{[^}]*?(?:^|\s)color\s*:\s*(#[0-9a-fA-F]{3,8})', css_text, re.MULTILINE)
arrow_color = QColor(m.group(1)) if m else QColor(200, 200, 200)
class _DarkArrowStyle(QProxyStyle):
"""Fusion proxy that draws visible arrows on dark themes."""
def drawPrimitive(self, element, option, painter, widget=None):
if element in (self.PrimitiveElement.PE_IndicatorSpinUp,
self.PrimitiveElement.PE_IndicatorSpinDown,
self.PrimitiveElement.PE_IndicatorArrowDown,
self.PrimitiveElement.PE_IndicatorArrowUp):
painter.save()
painter.setRenderHint(_P.RenderHint.Antialiasing)
painter.setPen(Qt.PenStyle.NoPen)
painter.setBrush(arrow_color)
r = option.rect
cx, cy = r.center().x(), r.center().y()
s = min(r.width(), r.height()) // 3
from PySide6.QtGui import QPolygon
if element in (self.PrimitiveElement.PE_IndicatorSpinUp,
self.PrimitiveElement.PE_IndicatorArrowUp):
painter.drawPolygon(QPolygon([
_QP(cx, cy - s), _QP(cx - s, cy + s), _QP(cx + s, cy + s)
]))
else:
painter.drawPolygon(QPolygon([
_QP(cx - s, cy - s), _QP(cx + s, cy - s), _QP(cx, cy + s)
]))
painter.restore()
return
super().drawPrimitive(element, option, painter, widget)
app.setStyle(_DarkArrowStyle("Fusion"))
app.setStyleSheet(css_text)
# Extract selection color for grid highlight
pal = app.palette()
m = re.search(r'selection-background-color\s*:\s*(#[0-9a-fA-F]{3,8})', css_text)
if m:
pal.setColor(QPalette.ColorRole.Highlight, QColor(m.group(1)))
# Set text color for spinbox/combobox arrows
m = re.search(r'QWidget\s*\{[^}]*?(?:^|\s)color\s*:\s*(#[0-9a-fA-F]{3,8})', css_text, re.MULTILINE)
if m:
text_color = QColor(m.group(1))
pal.setColor(QPalette.ColorRole.ButtonText, text_color)
pal.setColor(QPalette.ColorRole.WindowText, text_color)
pal.setColor(QPalette.ColorRole.Text, text_color)
m = re.search(r'QWidget\s*\{[^}]*?background-color\s*:\s*(#[0-9a-fA-F]{3,8})', css_text, re.MULTILINE)
if m:
bg_color = QColor(m.group(1))
pal.setColor(QPalette.ColorRole.Window, bg_color)
pal.setColor(QPalette.ColorRole.Base, bg_color)
pal.setColor(QPalette.ColorRole.Button, bg_color.lighter(120))
app.setPalette(pal)
except Exception as e:
log.warning(f"Operation failed: {e}")