Both panels forced a light palette on themselves (white rows, black
text, their own selection blue) so that element previews, which are
black line art drawn for the white sheet, would stay visible on a dark
desktop (bugtracker 335). On a dark palette the two docks were the
only white windows left.
The forced palettes are gone. Element previews are now kept as drawn,
on a transparent background, and adapted where they are shown:
ElementPreviewDelegate, installed on the collection tree, hands the
view a copy with its lightness inverted when the palette is dark
(QET::Palette::forPalette), so black ink becomes the palette's light
gray while colored icons such as folders stay as they are; the drag
pixmap is adapted the same way. A light palette shows the previews
untouched. This fixes bugtracker 335 on every dark desktop rather than
masking it with a white panel.
The preview cache stored the old white-sheet pictures; it records the
format now and drops a cache written before this change once. The
amber "show this directory" highlight sets black text so it reads on
both palettes. The Projects panel only shows icons from the icon
theme, which has a dark variant, so nothing else changes there.
tests/qttest/tst_qetpalette: the line-art rule tells ink from color;
inversion keeps hue and alpha; a preview reads at 3:1 on the Base
color of both palettes; in a tree on the dark palette the delegate
inverts a line-art icon and leaves a colored one alone.
Fixes#945.
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.
Jeff Patterson