Hovering a tool button changed only its frame, and on the dark palette
Fusion's hover frame is too faint to notice, so nothing told the user
which button was under the pointer (GitHub #870, PR 3 of the plan).
QETStyle wraps the running style. For QIcon::Active it returns line-art
icons tinted in the palette's highlight color, lightened until the tint
reads at 3:1 on the Light role, which is the top of Fusion's hover
gradient. Colored icons keep their colors, using the same line-art rule
as misc/make_icon_themes.py. Every other mode goes to the base style.
Fusion also asks for QIcon::Active for the icon of a highlighted menu
item and paints it on the highlight bar, where the tint would vanish.
The generated pixmap is cached per icon and cannot tell a menu from a
toolbar, so drawControl(CE_MenuItem) hands the base style an icon whose
Active pixmap is in the HighlightedText color instead.
QETApp::initStyle() installs the proxy on every platform, keeping the
base style's object name so the Fusion checks still match.
tests/qttest/tst_qeticons: hovering changes the icon ink to the tint and
stays at 3:1 on both palettes, on a raised button and on a checked one
drawn sunken, where the frame gives no hover cue at all; a colored icon is unchanged on hover; a
highlighted menu item's icon reads at 3:1 on the highlight bar.
inkcontrast.h gains background() and ink() helpers for those checks.
189 of QET's 266 fixed-size icons are black line art with no dark
variant, so on a dark palette they were black on a dark toolbar, and
Fusion's disabled rendering lightened them into something more readable
than the enabled state (GitHub #466, #870; bugtracker 335 for the
element panels, which keep their own fix).
The theme "qet-dark" holds light-ink copies of the line-art icons in
ico/themes/qet-dark, generated by misc/make_icon_themes.py. Colored
icons are not copied; the theme inherits them from "qet". An icon counts
as line art when fewer than 20% of its visible pixels are saturated. The
copies keep hue and alpha and invert lightness, scaled so each icon's
darkest ink becomes (220,220,220), the dark palette's text color. The
eight SVG icons get their color replaced the same way.
QETApp::applyIconTheme() picks "qet-dark" for a dark palette and "qet"
otherwise. It runs from initIconTheme(), again from initStyle() once the
palette is final, and on the OS color scheme switch. Icons created with
QIcon::fromTheme() re-resolve on their next paint, so nothing else
changes.
With light-ink files, Fusion's own disabled rendering comes out dimmer
than enabled with no extra code.
tests/qttest/tst_qeticons: every name resolves in both themes, every
dark file has light ink, and a Fusion tool button shows its icon at 3:1
in both themes with disabled weaker than enabled.
QET had no icon theme: the 446 entries of the icon table and the 116
iconsets in .ui files each named a resource path, so an icon could only
ever be one file, and a variant for another palette or a vector source
had nowhere to go (GitHub #466, #690, #870). This adds the theme layout
without changing a single pixel; a dark variant comes in a follow-up.
The theme "qet" follows the freedesktop layout Qt's icon loader
understands. misc/make_icon_themes.py generates ico/icon-themes.qrc,
which aliases the existing ico/<size>/<name>.png files into
themes/qet/<size>/<name>.png, and ico/themes/qet/index.theme. No file
moves. The four table entries that paired a 16 pixel file with a 22
pixel file of another name (ConductorSettings, DiagramAdd,
DiagramDelete, DialogInformation) get the 22 pixel file aliased under
the 16 pixel name.
QETApp::initIconTheme() registers the theme before initIcons() and makes
it current on every platform, so a desktop icon theme cannot replace
QET's icons. Icons are then looked up by name: QIcon::fromTheme() in
qeticons.cpp and in the few places that built a QIcon from a resource
path directly, and theme="..." on the iconsets in .ui files, with the
resource path kept as fallback. Flags, color swatches, application and
MIME icons stay on their paths.
One entry does not go through the theme. The elements panel draws the
project root with ProjectFileGP in the 50 pixel slot it reserves for
element previews, and the name "project" also carries the 128 pixel
file the configuration dialog uses. On a 2x display Qt's loader picks
that file for a 50 pixel request and fills the slot. ProjectFileGP
loads the 16 and 22 pixel files directly, as before.
tests/qttest/tst_qeticons: every name in the theme resolves, the four
aliases resolve at 22 pixels, a Fusion tool button shows its icon at
3:1 with disabled weaker than enabled, and the project root icon stays
at 22 pixels or less when asked for 50 at 2x while the configuration
dialog still gets its 128 pixel file. The rendering helpers shared
with tst_qetpalette moved to tests/qttest/inkcontrast.h.
Jeff Patterson