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Jeff Patterson
1c8e7ed052
main.cpp has forced the Fusion style on macOS since 2019, but the palette
still came from Qt's macOS platform theme, which is built for the native
style. It hands Fusion a Window, Button and Base that are the same color,
a Dark lighter than Light, and in dark mode an Inactive ButtonText of
black. Fusion derives its frames, gradients and indicators from those
roles, so fields had no edges, the radio buttons in the text alignment
dialog vanished, and the "Handles" combo box in the diagram editor
toolbar drew its text black on a dark combo the moment the window lost
focus. Light mode had the same flatness, with Window, Button and Base
all white.
Add QET::Palette (sources/qetpalette.{h,cpp}) with a light and a dark
palette laid out the way Fusion expects, and install one from
QETApp::initStyle() on macOS when the running style is Fusion, choosing
by the platform palette's lightness and keeping the platform's accent
color when it reads at 4.5:1. On macOS the base palette is now applied
whether or not "use system colors" is checked, since the system palette
cannot be drawn by Fusion; that setting only decides whether style.css
is layered on top (#467). On Qt 6.5+ the app follows the OS light/dark
switch through QStyleHints::colorSchemeChanged.
Other platforms are untouched: Fusion is Qt's default style on Linux
desktops without a platform theme, and the palette there carries the
user's desktop colors. Making Fusion and this palette the default
everywhere is discussed in #870.
tests/qttest/tst_qetpalette checks every text role pair at WCAG 4.5:1
(3:1 disabled), that Inactive equals Active, and paints a Fusion combo
box, radio buttons, buttons and a line edit on the offscreen platform to
measure the ink against its background. Set QET_TEST_DUMP_DIR to keep
the rendered images.