Merge pull request #942 from elevatormind/gitignore-ide-addition

chore: ignore IDE settings and cache files
Merge pull request #946 from jp2images/feature-panels-follow-palette
2026-09-20 07:14:13 +02:00 · 2026-09-19 20:25:12 +02:00 · 2026-09-19 20:24:05 +02:00 · 2026-09-19 20:22:29 +02:00 · 2026-09-19 20:20:58 +02:00 · 2026-09-19 20:18:20 +02:00
57 changed files with 1197 additions and 115 deletions
@@ -8,3 +8,11 @@ doc/*
 QElectroTech.tag
 !doc/doc-utils
 lang/*.qm
+
+# -- IDE settings/intermediate files --
+# zed
+.zed
+.cache
+
+# VS Code
+.vscode
@@ -250,6 +250,8 @@ set(QET_SRC_FILES
  ${QET_DIR}/sources/qeticons.h
  ${QET_DIR}/sources/qetpalette.cpp
  ${QET_DIR}/sources/qetpalette.h
+  ${QET_DIR}/sources/qetstyle.cpp
+  ${QET_DIR}/sources/qetstyle.h
  ${QET_DIR}/sources/qetinformation.cpp
  ${QET_DIR}/sources/qetinformation.h
  ${QET_DIR}/sources/qetmainwindow.cpp
@@ -434,6 +436,8 @@ set(QET_SRC_FILES
  ${QET_DIR}/sources/ElementsCollection/elementcollectionhandler.h
  ${QET_DIR}/sources/ElementsCollection/elementcollectionitem.cpp
  ${QET_DIR}/sources/ElementsCollection/elementcollectionitem.h
+  ${QET_DIR}/sources/ElementsCollection/elementpreviewdelegate.cpp
+  ${QET_DIR}/sources/ElementsCollection/elementpreviewdelegate.h
  ${QET_DIR}/sources/ElementsCollection/elementscollectionmodel.cpp
  ${QET_DIR}/sources/ElementsCollection/elementscollectionmodel.h
  ${QET_DIR}/sources/ElementsCollection/elementscollectionwidget.cpp
@@ -216,6 +216,8 @@ Clarification:
    ico/128x128/diagram.png by the QElectroTech team (License CC BY-ND 3.0)
    ico/128x128/document-export.png by the QElectroTech team (License CC BY-ND 3.0)
    ico/128x128/project.png by the QElectroTech team (License CC BY-ND 3.0)
+    ico/scalable/pdf-import.svg by Jeff Patterson from the QElectroTech team (License CC BY-ND 3.0), laid out like ico/22x22/insert-image.png
+    ico/scalable/diagram.svg, folio-new.svg, folio-delete.svg, folio-properties.svg, label.svg by Jeff Patterson from the QElectroTech team (License CC BY-ND 3.0), the folio icons redrawn in the same style
    ico/256x256/* by Nuri from the QElectroTech team (License CC BY-ND 3.0)
    ico/breeze-icons/* by Nuri from the QElectroTech team (License CC BY-ND 3.0)
    ico/diagram.png by Nuri from the QElectroTech team (License CC BY-ND 3.0)
@@ -148,15 +148,8 @@
        <file alias="themes/qet/22x22/conductor-reset.png">22x22/conductor2.png</file>
        <file alias="themes/qet/22x22/configure-toolbars.png">22x22/configure-toolbars.png</file>
        <file alias="themes/qet/22x22/configure.png">22x22/configure.png</file>
-        <file alias="themes/qet/22x22/diagram.png">22x22/diagram.png</file>
-        <file alias="themes/qet/22x22/diagram_add.png">22x22/diagram_add.png</file>
-        <file alias="themes/qet/22x22/folio-new.png">22x22/diagram_add.png</file>
        <file alias="themes/qet/22x22/diagram_bg.png">22x22/diagram_bg.png</file>
-        <file alias="themes/qet/22x22/diagram_del.png">22x22/diagram_del.png</file>
-        <file alias="themes/qet/22x22/folio-delete.png">22x22/diagram_del.png</file>
        <file alias="themes/qet/22x22/dialog-cancel.png">22x22/dialog-cancel.png</file>
-        <file alias="themes/qet/22x22/dialog-information.png">22x22/dialog-information.png</file>
-        <file alias="themes/qet/22x22/folio-properties.png">22x22/dialog-information.png</file>
        <file alias="themes/qet/22x22/dialog-ok.png">22x22/dialog-ok.png</file>
        <file alias="themes/qet/22x22/document-close.png">22x22/document-close.png</file>
        <file alias="themes/qet/22x22/document-export.png">22x22/document-export.png</file>
@@ -207,7 +200,6 @@
        <file alias="themes/qet/22x22/guides.png">22x22/guides.png</file>
        <file alias="themes/qet/22x22/hotspot.png">22x22/hotspot.png</file>
        <file alias="themes/qet/22x22/insert-image.png">22x22/insert-image.png</file>
-        <file alias="themes/qet/22x22/label.png">22x22/label.png</file>
        <file alias="themes/qet/22x22/landscape.png">22x22/landscape.png</file>
        <file alias="themes/qet/22x22/line.png">22x22/line.png</file>
        <file alias="themes/qet/22x22/list-add.png">22x22/list-add.png</file>
@@ -218,7 +210,6 @@
        <file alias="themes/qet/22x22/object-locked.png">22x22/object-locked.png</file>
        <file alias="themes/qet/22x22/object-rotate-right.png">22x22/object-rotate-right.png</file>
        <file alias="themes/qet/22x22/object-unlocked.png">22x22/object-unlocked.png</file>
-        <file alias="themes/qet/22x22/pdf-import.png">22x22/pdf-import.png</file>
        <file alias="themes/qet/22x22/polygon.png">22x22/polygon.png</file>
        <file alias="themes/qet/22x22/portrait.png">22x22/portrait.png</file>
        <file alias="themes/qet/22x22/preferences-desktop-user.png">22x22/preferences-desktop-user.png</file>
@@ -274,6 +265,12 @@
        <file alias="themes/qet/128x128/printer.png">128x128/printer.png</file>
        <file alias="themes/qet/128x128/project.png">128x128/project.png</file>
        <file alias="themes/qet/128x128/settings.png">128x128/settings.png</file>
+        <file alias="themes/qet/scalable/diagram.svg">scalable/diagram.svg</file>
+        <file alias="themes/qet/scalable/folio-delete.svg">scalable/folio-delete.svg</file>
+        <file alias="themes/qet/scalable/folio-new.svg">scalable/folio-new.svg</file>
+        <file alias="themes/qet/scalable/folio-properties.svg">scalable/folio-properties.svg</file>
+        <file alias="themes/qet/scalable/label.svg">scalable/label.svg</file>
+        <file alias="themes/qet/scalable/pdf-import.svg">scalable/pdf-import.svg</file>
        <file alias="themes/qet/scalable/edit-opacity.svg">breeze-icons/scalable/apps/hidef/edit-opacity.svg</file>
        <file alias="themes/qet/scalable/image-flip-horizontal.svg">breeze-icons/scalable/apps/hidef/image-flip-horizontal-symbolic.svg</file>
        <file alias="themes/qet/scalable/image-flip-vertical.svg">breeze-icons/scalable/apps/hidef/image-flip-vertical-symbolic.svg</file>
@@ -290,7 +287,6 @@
        <file>themes/qet-dark/16x16/conductor-edit.png</file>
        <file>themes/qet-dark/16x16/configure-toolbars.png</file>
        <file>themes/qet-dark/16x16/configure.png</file>
-        <file>themes/qet-dark/16x16/diagram.png</file>
        <file>themes/qet-dark/16x16/dialog-cancel.png</file>
        <file>themes/qet-dark/16x16/dialog-ok.png</file>
        <file>themes/qet-dark/16x16/document-export.png</file>
@@ -331,9 +327,6 @@
        <file>themes/qet-dark/16x16/folder-open.png</file>
        <file>themes/qet-dark/16x16/folder-show-all.png</file>
        <file>themes/qet-dark/16x16/folder.png</file>
-        <file>themes/qet-dark/16x16/folio-delete.png</file>
-        <file>themes/qet-dark/16x16/folio-new.png</file>
-        <file>themes/qet-dark/16x16/folio-properties.png</file>
        <file>themes/qet-dark/16x16/folio-ref-coming.png</file>
        <file>themes/qet-dark/16x16/go-company.png</file>
        <file>themes/qet-dark/16x16/go-down-double.png</file>
@@ -348,7 +341,6 @@
        <file>themes/qet-dark/16x16/item-copy.png</file>
        <file>themes/qet-dark/16x16/item-move.png</file>
        <file>themes/qet-dark/16x16/kdenlive-show-video.png</file>
-        <file>themes/qet-dark/16x16/label.png</file>
        <file>themes/qet-dark/16x16/list-add.png</file>
        <file>themes/qet-dark/16x16/list-remove.png</file>
        <file>themes/qet-dark/16x16/masquer.png</file>
@@ -381,15 +373,7 @@
        <file>themes/qet-dark/22x22/arrow-right.png</file>
        <file>themes/qet-dark/22x22/configure-toolbars.png</file>
        <file>themes/qet-dark/22x22/configure.png</file>
-        <file>themes/qet-dark/22x22/diagram.png</file>
-        <file>themes/qet-dark/22x22/diagram_add.png</file>
-        <file>themes/qet-dark/22x22/folio-new.png</file>
-        <file>themes/qet-dark/22x22/diagram_bg.png</file>
-        <file>themes/qet-dark/22x22/diagram_del.png</file>
-        <file>themes/qet-dark/22x22/folio-delete.png</file>
        <file>themes/qet-dark/22x22/dialog-cancel.png</file>
-        <file>themes/qet-dark/22x22/dialog-information.png</file>
-        <file>themes/qet-dark/22x22/folio-properties.png</file>
        <file>themes/qet-dark/22x22/dialog-ok.png</file>
        <file>themes/qet-dark/22x22/document-export.png</file>
        <file>themes/qet-dark/22x22/document-import.png</file>
@@ -425,7 +409,6 @@
        <file>themes/qet-dark/22x22/go-up.png</file>
        <file>themes/qet-dark/22x22/grid.png</file>
        <file>themes/qet-dark/22x22/insert-image.png</file>
-        <file>themes/qet-dark/22x22/label.png</file>
        <file>themes/qet-dark/22x22/landscape.png</file>
        <file>themes/qet-dark/22x22/line.png</file>
        <file>themes/qet-dark/22x22/list-add.png</file>
@@ -436,7 +419,6 @@
        <file>themes/qet-dark/22x22/object-locked.png</file>
        <file>themes/qet-dark/22x22/object-rotate-right.png</file>
        <file>themes/qet-dark/22x22/object-unlocked.png</file>
-        <file>themes/qet-dark/22x22/pdf-import.png</file>
        <file>themes/qet-dark/22x22/polygon.png</file>
        <file>themes/qet-dark/22x22/portrait.png</file>
        <file>themes/qet-dark/22x22/preferences-desktop-user.png</file>
@@ -472,8 +454,13 @@
        <file>themes/qet-dark/48x48/user-away.png</file>
        <file>themes/qet-dark/48x48/view-pim-journal.png</file>
        <file>themes/qet-dark/128x128/plasmagik.png</file>
-        <file>themes/qet-dark/128x128/printer.png</file>
        <file>themes/qet-dark/128x128/settings.png</file>
+        <file>themes/qet-dark/scalable/diagram.svg</file>
+        <file>themes/qet-dark/scalable/folio-delete.svg</file>
+        <file>themes/qet-dark/scalable/folio-new.svg</file>
+        <file>themes/qet-dark/scalable/folio-properties.svg</file>
+        <file>themes/qet-dark/scalable/label.svg</file>
+        <file>themes/qet-dark/scalable/pdf-import.svg</file>
        <file>themes/qet-dark/scalable/edit-opacity.svg</file>
        <file>themes/qet-dark/scalable/image-flip-horizontal.svg</file>
        <file>themes/qet-dark/scalable/image-flip-vertical.svg</file>
@@ -0,0 +1,12 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24">
+  <defs id="defs3051">
+    <style type="text/css" id="current-color-scheme">
+      .ColorScheme-Text {
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+      </style>
+  </defs>
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+</svg>
@@ -0,0 +1,12 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24">
+  <defs id="defs3051">
+    <style type="text/css" id="current-color-scheme">
+      .ColorScheme-Text {
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+      </style>
+  </defs>
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+  </g>
+</svg>
@@ -0,0 +1,12 @@
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+  <defs id="defs3051">
+    <style type="text/css" id="current-color-scheme">
+      .ColorScheme-Text {
+        color:#4d4d4d;
+      }
+      </style>
+  </defs>
+  <g transform="translate(1,1)">
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+</svg>
@@ -0,0 +1,12 @@
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+  <defs id="defs3051">
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+  </g>
+</svg>
@@ -0,0 +1,12 @@
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+  <defs id="defs3051">
+    <style type="text/css" id="current-color-scheme">
+      .ColorScheme-Text {
+        color:#4d4d4d;
+      }
+      </style>
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+</svg>
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+  </g>
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+  </g>
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+  </g>
+</svg>
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+  <defs id="defs3051">
+    <style type="text/css" id="current-color-scheme">
+      .ColorScheme-Text {
+        color:#dcdcdc;
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+  </g>
+</svg>
@@ -0,0 +1,13 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24">
+  <defs id="defs3051">
+    <style type="text/css" id="current-color-scheme">
+      .ColorScheme-Text {
+        color:#dcdcdc;
+      }
+      </style>
+  </defs>
+  <g transform="translate(1,1)">
+  <path style="fill:#dcdcdc;fill-opacity:1;stroke:none" d="M 3 3 h 16 v 1 h -16 Z M 3 4 h 1 v 15 h -1 Z M 4 18 h 10 v 1 h -10 Z M 18 4 h 1 v 8 h -1 Z M 16 14 h 1 v 5 h -1 Z M 14 16 h 5 v 1 h -5 Z" class="ColorScheme-Text"/>
+  <path style="fill:#dcdcdc;fill-opacity:1;stroke:none" d="M 5 7 h 1 v 1 h -1 Z M 6 7 h 1 v 1 h -1 Z M 7 7 h 1 v 1 h -1 Z M 5 8 h 1 v 1 h -1 Z M 7 8 h 1 v 1 h -1 Z M 5 9 h 1 v 1 h -1 Z M 6 9 h 1 v 1 h -1 Z M 7 9 h 1 v 1 h -1 Z M 5 10 h 1 v 1 h -1 Z M 5 11 h 1 v 1 h -1 Z M 9 7 h 1 v 1 h -1 Z M 10 7 h 1 v 1 h -1 Z M 9 8 h 1 v 1 h -1 Z M 11 8 h 1 v 1 h -1 Z M 9 9 h 1 v 1 h -1 Z M 11 9 h 1 v 1 h -1 Z M 9 10 h 1 v 1 h -1 Z M 11 10 h 1 v 1 h -1 Z M 9 11 h 1 v 1 h -1 Z M 10 11 h 1 v 1 h -1 Z M 13 7 h 1 v 1 h -1 Z M 14 7 h 1 v 1 h -1 Z M 15 7 h 1 v 1 h -1 Z M 13 8 h 1 v 1 h -1 Z M 13 9 h 1 v 1 h -1 Z M 14 9 h 1 v 1 h -1 Z M 13 10 h 1 v 1 h -1 Z M 13 11 h 1 v 1 h -1 Z" class="ColorScheme-Text"/>
+  </g>
+</svg>
@@ -38,6 +38,13 @@ An icon counts as line art when fewer than 20% of its visible pixels are
 saturated. Its dark copy keeps hue and alpha and inverts lightness, scaled
 so pure black becomes (220, 220, 220), the dark palette's text color.

+An icon drawn as a light object is left alone even when it is not
+saturated: a page sheet, a printer body, the white half of the background
+swatch. Such art already reads on a dark toolbar, and inverting it would
+turn the white body black (the PDF import icon, GitHub #919). The test is
+the share of visible pixels that are near white: 30% or more and the icon
+inherits from the light theme untouched.
+
 Requires Pillow. Idempotent: running it twice changes nothing.
 """

@@ -64,16 +71,21 @@ SIZES = ["16x16", "22x22", "32x32", "48x48", "128x128"]

 # Table entries in sources/qeticons.cpp that pair a 16 pixel file with a
 # 22 pixel file of another name. The theme needs one name per icon, so
-# the 22 pixel file is exposed under the 16 pixel name as well.
+# the 22 pixel file is exposed under the 16 pixel name as well. The folio
+# icons that used to be listed here are SVGs now (ico/scalable/).
 ALIASES = {
    "22x22/conductor2.png": "conductor-reset",
-    "22x22/diagram_add.png": "folio-new",
-    "22x22/diagram_del.png": "folio-delete",
-    "22x22/dialog-information.png": "folio-properties",
 }

-# SVG icons referenced from sources/qeticons.cpp.
+# SVG icons referenced from sources/qeticons.cpp. ico/scalable/ holds the
+# ones drawn for QET as vectors; one file serves every size.
 SVGS = [
+    "scalable/diagram.svg",
+    "scalable/folio-delete.svg",
+    "scalable/folio-new.svg",
+    "scalable/folio-properties.svg",
+    "scalable/label.svg",
+    "scalable/pdf-import.svg",
    "breeze-icons/scalable/apps/hidef/edit-opacity.svg",
    "breeze-icons/scalable/apps/hidef/image-flip-horizontal-symbolic.svg",
    "breeze-icons/scalable/apps/hidef/image-flip-vertical-symbolic.svg",
@@ -85,6 +97,8 @@ SVGS = [
 ]

 SATURATED_FRACTION = 0.20   # at or above this an icon is "colored"
+WHITE_LIGHTNESS = 0.85      # a visible pixel this light counts as white
+WHITE_FRACTION = 0.30       # at or above this an icon is "light art"
 INK = 220 / 255.0           # lightness of pure black after inversion
 SVG_INK = "#dcdcdc"

@@ -107,6 +121,16 @@ def is_line_art(image):
    return saturated / len(pixels) < SATURATED_FRACTION


+def has_light_fill(image):
+    """True when the icon is mostly white: a page, a sheet, a light body."""
+    pixels = visible_pixels(image)
+    if not pixels:
+        return False
+    white = sum(1 for r, g, b, _ in pixels
+                if colorsys.rgb_to_hls(r / 255, g / 255, b / 255)[1] > WHITE_LIGHTNESS)
+    return white / len(pixels) >= WHITE_FRACTION
+
+
 def invert_lightness(image):
    """Invert lightness, keeping hue, saturation and alpha.

@@ -177,7 +201,7 @@ def main():
    light = []   # (alias, source) pairs, paths relative to ico/
    dark = []    # paths relative to ico/, files exist on disk
    changed = 0
-    line_art = colored = 0
+    line_art = colored = light_art = 0

    for size in SIZES:
        folder = ICO / size
@@ -188,7 +212,10 @@ def main():
                names.append(ALIASES[rel])
            image = Image.open(png).convert("RGBA")
            art = is_line_art(image)
-            if art:
+            if art and has_light_fill(image):
+                art = False
+                light_art += 1
+            elif art:
                line_art += 1
                dark_image = None
            else:
@@ -213,6 +240,15 @@ def main():
        changed += write_if_changed(target, text)
        dark.append(f"themes/qet-dark/scalable/{name}")

+    # Drop dark files from an earlier run that are no longer generated, so
+    # a reclassified icon falls back to the light theme instead of keeping
+    # a stale copy.
+    for stale in sorted((THEMES / "qet-dark").glob("*/*")):
+        if stale.is_file() and stale.name != "index.theme" \
+                and str(stale.relative_to(ICO)) not in dark:
+            stale.unlink()
+            changed += 1
+
    dirs = SIZES + ["scalable"]
    changed += write_if_changed(THEMES / "qet" / "index.theme",
                                index_theme("qet", "QElectroTech icons", dirs))
@@ -231,8 +267,8 @@ def main():
    qrc += ["    </qresource>", "</RCC>", ""]
    changed += write_if_changed(QRC, "\n".join(qrc))

-    print(f"{line_art} line-art icons, {colored} colored icons, {len(SVGS)} SVGs; "
-          f"{changed} files written")
+    print(f"{line_art} line-art icons, {light_art} light icons, {colored} colored icons, "
+          f"{len(SVGS)} SVGs; {changed} files written or removed")


 if __name__ == "__main__":
@@ -93,10 +93,7 @@
        <file>ico/22x22/conductor2.png</file>
        <file>ico/22x22/configure.png</file>
        <file>ico/22x22/configure-toolbars.png</file>
-        <file>ico/22x22/diagram_add.png</file>
-        <file>ico/22x22/diagram_del.png</file>
        <file>ico/22x22/dialog-cancel.png</file>
-        <file>ico/22x22/dialog-information.png</file>
        <file>ico/22x22/dialog-ok.png</file>
        <file>ico/22x22/document-close.png</file>
        <file>ico/22x22/document-export.png</file>
@@ -140,8 +137,6 @@
        <file>ico/22x22/go-up.png</file>
        <file>ico/22x22/hotspot.png</file>
        <file>ico/22x22/insert-image.png</file>
-        <file>ico/22x22/pdf-import.png</file>
-        <file>ico/22x22/label.png</file>
        <file>ico/22x22/landscape.png</file>
        <file>ico/22x22/line.png</file>
        <file>ico/22x22/list-add.png</file>
@@ -242,7 +237,6 @@
        <file>ico/16x16/project.png</file>
        <file>ico/16x16/qt.png</file>
        <file>ico/16x16/terminalstrip.png</file>
-        <file>ico/22x22/diagram.png</file>
        <file>ico/22x22/edit-clear-locationbar-rtl.png</file>
        <file>ico/22x22/export-csv.png</file>
        <file>ico/22x22/format-text-subscript.png</file>
@@ -0,0 +1,54 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "elementpreviewdelegate.h"
+
+#include <QWidget>
+
+#include "../qetpalette.h"
+
+/**
+	@brief ElementPreviewDelegate::initStyleOption
+	After the base class has filled the option from the model, replace
+	the icon with one that reads on a dark palette. The adapted icon is
+	built from the pixmap the view is about to draw, at the view's
+	decoration size and device pixel ratio.
+*/
+void ElementPreviewDelegate::initStyleOption(QStyleOptionViewItem *option,
+                                             const QModelIndex &index) const
+{
+	QStyledItemDelegate::initStyleOption(option, index);
+	if (option->icon.isNull() || !QET::Palette::isDark(option->palette))
+		return;
+
+	const qint64 key = option->icon.cacheKey();
+	const auto it = m_dark_icons.constFind(key);
+	if (it != m_dark_icons.constEnd())
+	{
+		option->icon = *it;
+		return;
+	}
+
+	const qreal dpr = option->widget ? option->widget->devicePixelRatio() : 1.0;
+	const QPixmap source = option->icon.pixmap(option->decorationSize, dpr);
+	const QPixmap adapted = QET::Palette::forPalette(source, option->palette);
+	QIcon icon = option->icon;
+	if (adapted.cacheKey() != source.cacheKey())
+		icon = QIcon(adapted);
+	m_dark_icons.insert(key, icon);
+	option->icon = icon;
+}
@@ -0,0 +1,50 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef ELEMENTPREVIEWDELEGATE_H
+#define ELEMENTPREVIEWDELEGATE_H
+
+#include <QHash>
+#include <QIcon>
+#include <QStyledItemDelegate>
+
+/**
+	@brief The ElementPreviewDelegate class
+	Draws the items of an element collection tree with icons that read on
+	the current palette. Element previews are black line art drawn for a
+	white sheet; on a dark palette this delegate hands the view the same
+	picture with its lightness inverted (QET::Palette::forPalette), so the
+	ink is light on the dark row. Colored icons, such as folders, are left
+	alone, and nothing changes on a light palette. Adapted icons are kept
+	per source icon, so a repaint costs a hash lookup.
+*/
+class ElementPreviewDelegate : public QStyledItemDelegate
+{
+	Q_OBJECT
+
+	public:
+		using QStyledItemDelegate::QStyledItemDelegate;
+
+	protected:
+		void initStyleOption(QStyleOptionViewItem *option,
+		                     const QModelIndex &index) const override;
+
+	private:
+		mutable QHash<qint64, QIcon> m_dark_icons;
+};
+
+#endif
@@ -725,7 +725,10 @@ void ElementsCollectionWidget::showThisDir()
 		ElementCollectionItem *eci =
 				elementCollectionItemForIndex(m_showed_index);
 		if (eci)
+		{
 			eci->setBackground(QBrush());
+			eci->setForeground(QBrush());
+		}
 	}

 	m_showed_index = m_index_at_context_menu;
@@ -736,7 +739,11 @@ void ElementsCollectionWidget::showThisDir()
 		ElementCollectionItem *eci =
 				elementCollectionItemForIndex(m_showed_index);
 		if (eci)
+		{
+			// Amber under black, whatever the palette's text color.
 			eci->setBackground(QBrush(QColor(255, 204, 0, 255)));
+			eci->setForeground(QBrush(Qt::black));
+		}
 		search();
 	}
 	else
@@ -755,7 +762,10 @@ void ElementsCollectionWidget::resetShowThisDir()
 		ElementCollectionItem *eci = elementCollectionItemForIndex(
 					m_showed_index);
 		if (eci)
+		{
 			eci->setBackground(QBrush());
+			eci->setForeground(QBrush());
+		}
 	}

 	m_showed_index = QModelIndex();
@@ -16,6 +16,8 @@
 	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
 */
 #include "elementstreeview.h"
+#include "elementpreviewdelegate.h"
+#include "../qetpalette.h"

 #include "../factory/elementfactory.h"
 #include "../qetgraphicsitem/element.h"
@@ -41,24 +43,11 @@ static int MAX_DND_PIXMAP_HEIGHT = 375;
 ElementsTreeView::ElementsTreeView(QWidget *parent) :
 	QTreeView(parent)
 {
-	// force du noir sur une alternance de blanc (comme le schema) et de gris
-	// clair, avec du blanc sur bleu pas trop fonce pour la selection
-	//
-	// Element icons are rendered with colors read directly from each .elmt
-	// file (almost always black linework, matching printed-schematic
-	// convention) onto a transparent background -- so this view must keep
-	// a light background regardless of the OS/desktop theme, or the icons
-	// become invisible on dark themes. QAbstractItemView paints its rows
-	// using the viewport's palette, not the view's own, so the palette
-	// must be applied to both to actually take effect under every style.
-	QPalette qp = palette();
-	qp.setColor(QPalette::Text,            Qt::black);
-	qp.setColor(QPalette::Base,            Qt::white);
-	qp.setColor(QPalette::AlternateBase,   QColor("#e8e8e8"));
-	qp.setColor(QPalette::Highlight,       QColor("#678db2"));
-	qp.setColor(QPalette::HighlightedText, Qt::black);
-	setPalette(qp);
-	viewport()->setPalette(qp);
+	// Rows follow the application palette. Element previews are black
+	// line art drawn for a white sheet; ElementPreviewDelegate adapts them
+	// to a dark palette, so this view no longer has to force a light one
+	// (bugtracker #335).
+	setItemDelegate(new ElementPreviewDelegate(this));
 }

 /**
@@ -220,7 +209,7 @@ void ElementsTreeView::startElementDrag(const ElementsLocation &location)
 			&elmt_creation_state));
 		if (elmt_creation_state) { return; }

-		QPixmap elmt_pixmap(temp_elmt->pixmap());
+		QPixmap elmt_pixmap(QET::Palette::forPalette(temp_elmt->pixmap(), palette()));
 		QPoint elmt_hotspot(temp_elmt->hotspot());

 			//Adjust the size of the pixmap if he is too big
@@ -52,6 +52,18 @@ ElementsCollectionCache::ElementsCollectionCache(const QString &database_path, Q
 		QSqlQuery(cache_db_).exec("PRAGMA locking_mode = EXCLUSIVE");
 		QSqlQuery(cache_db_).exec("PRAGMA synchronous = OFF");

+			// Previews used to be stored on an opaque white sheet; they are
+			// transparent now, so the collection tree can adapt them to a
+			// dark palette. A cache written before that is dropped once.
+		QSqlQuery(cache_db_).exec("CREATE TABLE IF NOT EXISTS meta"
+					   "(key VARCHAR(32) NOT NULL PRIMARY KEY, value VARCHAR(64));");
+		QSqlQuery meta(cache_db_);
+		meta.exec("SELECT value FROM meta WHERE key = 'pixmaps'");
+		if (!meta.next() || meta.value(0).toString() != QLatin1String("transparent")) {
+			QSqlQuery(cache_db_).exec("DROP TABLE IF EXISTS pixmaps");
+			QSqlQuery(cache_db_).exec("DROP TABLE IF EXISTS names");
+			QSqlQuery(cache_db_).exec("REPLACE INTO meta (key, value) VALUES ('pixmaps', 'transparent')");
+		}
 #if TODO_LIST
 #pragma message("@TODO the tables could already exist, handle that case.")
 #endif
@@ -54,24 +54,8 @@ ElementsPanel::ElementsPanel(QWidget *parent) :
 	setDropIndicatorShown(true);
 	setAutoExpandDelay(1000);
 	
-	// force du noir sur une alternance de blanc (comme le schema) et de gris
-	// clair, avec du blanc sur bleu pas trop fonce pour la selection
-	//
-	// Element icons are rendered with colors read directly from each .elmt
-	// file (almost always black linework, matching printed-schematic
-	// convention) onto a transparent background -- so this view must keep
-	// a light background regardless of the OS/desktop theme, or the icons
-	// become invisible on dark themes. QAbstractItemView paints its rows
-	// using the viewport's palette, not the view's own, so the palette
-	// must be applied to both to actually take effect under every style.
-	QPalette qp = palette();
-	qp.setColor(QPalette::Text,            Qt::black);
-	qp.setColor(QPalette::Base,            Qt::white);
-	qp.setColor(QPalette::AlternateBase,   QColor("#e8e8e8"));
-	qp.setColor(QPalette::Highlight,       QColor("#678db2"));
-	qp.setColor(QPalette::HighlightedText, Qt::black);
-	setPalette(qp);
-	viewport()->setPalette(qp);
+	// Rows follow the application palette; the icons shown here come from
+	// the icon theme, which has a dark variant.
 	
 		// we handle double click on items ourselves
 	connect(this, &ElementsPanel::itemDoubleClicked, this, &ElementsPanel::slot_doubleClick);
@@ -146,12 +146,13 @@ QPixmap ElementPictureFactory::pixmap(const ElementsLocation &location)
 		QPixmap pix(w, h);
 			//Element definitions almost always draw with a hardcoded black
 			//stroke color, on the assumption of the white diagram sheet they
-			//are normally placed on. A transparent background here makes
-			//that stroke disappear against a dark widget/tree-view background
-			//(bugtracker #335). Give it an opaque white background instead -
-			//exactly what the element already assumes visually, in every
-			//context this pixmap is used (tree icons, drag icon, previews).
-		pix.fill(Qt::white);
+			//are normally placed on. The pixmap is kept as drawn, on a
+			//transparent background: the places that show it (the
+			//collection tree through ElementPreviewDelegate, the drag icon)
+			//adapt it to the palette with QET::Palette::forPalette(), so a
+			//dark palette gets light ink instead of black on black
+			//(bugtracker #335).
+		pix.fill(Qt::transparent);

 		QPainter painter(&pix);
 		painter.setRenderHint(QPainter::Antialiasing, true);
@@ -28,6 +28,7 @@
 #include "qetdiagrameditor.h"
 #include "qeticons.h"
 #include "qetpalette.h"
+#include "qetstyle.h"
 #include "utils/qetutils.h"
 #include "qetmessagebox.h"
 #include "qetproject.h"
@@ -52,6 +53,7 @@
 #include <QFontDatabase>
 #include <QProcessEnvironment>
 #include <QRegularExpression>
+#include <QStyleFactory>
 #include <QStyleHints>
 #ifdef BUILD_WITHOUT_KF
 #	include "ui/nokde/kautosavefile.h"
@@ -2368,6 +2370,12 @@ void QETApp::applyIconTheme(const QPalette &palette)
 */
 void QETApp::initStyle()
 {
+	// Wrap the running style so icons get a hover state (see qetstyle.h).
+	// The proxy keeps the base style's object name, so the Fusion checks
+	// below still see "fusion".
+	if (!qobject_cast<QETStyle *>(qApp->style()))
+		qApp->setStyle(new QETStyle(QStyleFactory::create(qApp->style()->objectName())));
+
 	initial_palette_ = qApp->palette();

 #ifdef Q_OS_MACOS
@@ -17,6 +17,7 @@
 */
 #include "qetpalette.h"

+#include <QColor>
 #include <QStyle>
 #include <cmath>

@@ -177,3 +178,68 @@ QPalette QET::Palette::forFusion(const QPalette &platform)
 	return withPlatformAccent(isDark(platform) ? fusionDark() : fusionLight(),
 	                          platform);
 }
+
+bool QET::Palette::isLineArt(const QImage &image)
+{
+	const QImage source = image.convertToFormat(QImage::Format_ARGB32);
+	int visible = 0;
+	int saturated = 0;
+	for (int y = 0; y < source.height(); ++y)
+	{
+		const QRgb *line = reinterpret_cast<const QRgb *>(source.constScanLine(y));
+		for (int x = 0; x < source.width(); ++x)
+		{
+			if (qAlpha(line[x]) <= 64)
+				continue;
+			++visible;
+			const QColor color(line[x]);
+			if (color.hslSaturationF() > 0.25 && color.value() > 60)
+				++saturated;
+		}
+	}
+	return visible > 0 && saturated < visible * 0.20;
+}
+
+QImage QET::Palette::invertedLightness(const QImage &image)
+{
+	// Lightness of pure black after inversion: the dark palette's text.
+	const qreal ink = 220.0 / 255.0;
+	QImage result = image.convertToFormat(QImage::Format_ARGB32);
+	qreal darkest = 1.0;
+	for (int y = 0; y < result.height(); ++y)
+	{
+		const QRgb *line = reinterpret_cast<const QRgb *>(result.constScanLine(y));
+		for (int x = 0; x < result.width(); ++x)
+			if (qAlpha(line[x]) > 64)
+				darkest = qMin(darkest, QColor(line[x]).lightnessF());
+	}
+	const qreal span = qMax(1.0 - darkest, 1e-6);
+	for (int y = 0; y < result.height(); ++y)
+	{
+		QRgb *line = reinterpret_cast<QRgb *>(result.scanLine(y));
+		for (int x = 0; x < result.width(); ++x)
+		{
+			const int alpha = qAlpha(line[x]);
+			if (alpha == 0)
+				continue;
+			const QColor color(line[x]);
+			const qreal lightness = qBound(0.0, ink * (1.0 - (color.lightnessF() - darkest) / span), 1.0);
+			QColor out = QColor::fromHslF(qMax(color.hslHueF(), 0.0), color.hslSaturationF(), lightness);
+			out.setAlpha(alpha);
+			line[x] = out.rgba();
+		}
+	}
+	return result;
+}
+
+QPixmap QET::Palette::forPalette(const QPixmap &pixmap, const QPalette &palette)
+{
+	if (pixmap.isNull() || !isDark(palette))
+		return pixmap;
+	const QImage image = pixmap.toImage();
+	if (!isLineArt(image))
+		return pixmap;
+	QPixmap result = QPixmap::fromImage(invertedLightness(image));
+	result.setDevicePixelRatio(pixmap.devicePixelRatio());
+	return result;
+}
@@ -18,7 +18,9 @@
 #ifndef QET_PALETTE_H
 #define QET_PALETTE_H

+#include <QImage>
 #include <QPalette>
+#include <QPixmap>

 class QStyle;

@@ -87,6 +89,29 @@ namespace QET {
 			platform's accent color kept when it is readable.
 		*/
 		QPalette forFusion(const QPalette &platform);
+
+		/**
+			True when fewer than a fifth of the visible pixels are
+			saturated: black or gray line art, which is what element
+			previews and most of QET's own icons are.
+		*/
+		bool isLineArt(const QImage &image);
+
+		/**
+			The image with its lightness inverted and hue, saturation and
+			alpha kept: the darkest ink becomes light gray (220), white
+			becomes black. The rule misc/make_icon_themes.py applies when
+			it builds the dark icon theme.
+		*/
+		QImage invertedLightness(const QImage &image);
+
+		/**
+			A picture drawn for a white sheet, made to read on palette:
+			returned as is on a light palette, and with its lightness
+			inverted on a dark one when it is line art. Colored art is
+			left alone either way.
+		*/
+		QPixmap forPalette(const QPixmap &pixmap, const QPalette &palette);
 	}
 }

@@ -0,0 +1,180 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "qetstyle.h"
+
+#include <QApplication>
+#include <QImage>
+#include <QPainter>
+#include <QPixmap>
+#include <QStyleOption>
+#include <QWidget>
+
+#include "qetpalette.h"
+
+/**
+	@brief QETStyle::QETStyle
+	@param base the style to wrap; this object takes ownership of it.
+*/
+QETStyle::QETStyle(QStyle *base) :
+	QProxyStyle(base)
+{
+	setObjectName(base ? base->objectName() : QString());
+}
+
+/**
+	@brief QETStyle::isLineArt
+	The same rule misc/make_icon_themes.py uses to pick the icons that
+	get a dark variant: an icon is line art when fewer than 20% of its
+	visible pixels are saturated.
+*/
+bool QETStyle::isLineArt(const QImage &image)
+{
+	const QImage source = image.convertToFormat(QImage::Format_ARGB32);
+	int visible = 0;
+	int saturated = 0;
+	for (int y = 0; y < source.height(); ++y)
+	{
+		const QRgb *line = reinterpret_cast<const QRgb *>(source.constScanLine(y));
+		for (int x = 0; x < source.width(); ++x)
+		{
+			const QRgb pixel = line[x];
+			if (qAlpha(pixel) <= 64)
+				continue;
+			++visible;
+			const QColor color(pixel);
+			if (color.hslSaturationF() > 0.25 && color.value() > 60)
+				++saturated;
+		}
+	}
+	return visible > 0 && saturated < visible * 0.20;
+}
+
+/**
+	@brief QETStyle::hoverColor
+	The palette's highlight color is the accent users already know from
+	selections. On a dark palette it is too dark to read on a hovered
+	button face, so it is lightened, a step at a time, until it reaches
+	3:1 (WCAG 1.4.11) against the Light role: Fusion paints a hovered
+	auto-raise button with a gradient that runs from Button up to about
+	that color, and the icon has to read on the lightest part of it.
+*/
+QColor QETStyle::hoverColor(const QPalette &palette)
+{
+	const QColor face = palette.color(QPalette::Active, QPalette::Light);
+	QColor ink = palette.color(QPalette::Active, QPalette::Highlight);
+	// 3.5 rather than 3.0: the top of Fusion's hover gradient is a shade
+	// lighter than the Light role, so the icon needs some headroom there.
+	for (int step = 0; step < 20 && QET::Palette::contrastRatio(ink, face) < 3.5; ++step)
+		ink = ink.lighter(110);
+	return ink;
+}
+
+/**
+	@brief QETStyle::tinted
+	@return pixmap with every pixel set to color, alpha kept.
+*/
+QPixmap QETStyle::tinted(const QPixmap &pixmap, const QColor &color)
+{
+	QImage image = pixmap.toImage().convertToFormat(QImage::Format_ARGB32_Premultiplied);
+	QPainter painter(&image);
+	painter.setCompositionMode(QPainter::CompositionMode_SourceIn);
+	painter.fillRect(image.rect(), color);
+	painter.end();
+
+	QPixmap result = QPixmap::fromImage(image);
+	result.setDevicePixelRatio(pixmap.devicePixelRatio());
+	return result;
+}
+
+/**
+	@brief QETStyle::menuIcon
+	An icon for a highlighted menu item: Normal as the original, Active
+	as the original in the HighlightedText color when it is line art.
+	Cached per source icon, size and device pixel ratio, since menus
+	repaint on every pointer move.
+*/
+QIcon QETStyle::menuIcon(const QIcon &icon, const QPalette &palette, int size, qreal dpr) const
+{
+	const QString key = QString("%1/%2/%3/%4")
+	                    .arg(icon.cacheKey()).arg(size).arg(dpr)
+	                    .arg(palette.color(QPalette::Active, QPalette::HighlightedText).name());
+	auto it = menu_icons_.constFind(key);
+	if (it != menu_icons_.constEnd())
+		return *it;
+
+	const QPixmap normal = icon.pixmap(QSize(size, size), dpr, QIcon::Normal);
+	QIcon result;
+	result.addPixmap(normal, QIcon::Normal);
+	result.addPixmap(isLineArt(normal.toImage())
+	                 ? tinted(normal, palette.color(QPalette::Active, QPalette::HighlightedText))
+	                 : normal,
+	                 QIcon::Active);
+	result.addPixmap(icon.pixmap(QSize(size, size), dpr, QIcon::Disabled), QIcon::Disabled);
+	menu_icons_.insert(key, result);
+	return result;
+}
+
+/**
+	@brief QETStyle::drawControl
+	CE_MenuItem with an icon and a highlight: swap the icon for menuIcon()
+	so the base style's QIcon::Active request gets an icon that reads on
+	the highlight bar. Everything else goes to the base style.
+*/
+void QETStyle::drawControl(ControlElement element,
+                           const QStyleOption *option,
+                           QPainter *painter,
+                           const QWidget *widget) const
+{
+	if (element == CE_MenuItem)
+	{
+		const auto *item = qstyleoption_cast<const QStyleOptionMenuItem *>(option);
+		if (item && !item->icon.isNull()
+		    && (item->state & State_Selected) && (item->state & State_Enabled))
+		{
+			QStyleOptionMenuItem copy = *item;
+			const int size = pixelMetric(PM_SmallIconSize, option, widget);
+			const qreal dpr = widget ? widget->devicePixelRatio()
+			                         : QApplication::instance() ? qApp->devicePixelRatio() : 1.0;
+			copy.icon = menuIcon(item->icon, item->palette, size, dpr);
+			QProxyStyle::drawControl(element, &copy, painter, widget);
+			return;
+		}
+	}
+	QProxyStyle::drawControl(element, option, painter, widget);
+}
+
+/**
+	@brief QETStyle::generatedIconPixmap
+	QIcon::Active: a line-art icon comes back tinted in hoverColor(),
+	alpha kept, so the hovered icon differs from the normal one on both
+	light and dark palettes. Colored icons and every
+	other mode go to the base style.
+*/
+QPixmap QETStyle::generatedIconPixmap(QIcon::Mode mode,
+                                      const QPixmap &pixmap,
+                                      const QStyleOption *option) const
+{
+	if (mode != QIcon::Active || pixmap.isNull())
+		return QProxyStyle::generatedIconPixmap(mode, pixmap, option);
+
+	if (!isLineArt(pixmap.toImage()))
+		return QProxyStyle::generatedIconPixmap(mode, pixmap, option);
+
+	const QPalette palette = option ? option->palette : QApplication::palette();
+	return tinted(pixmap, hoverColor(palette));
+}
@@ -0,0 +1,73 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef QET_STYLE_H
+#define QET_STYLE_H
+
+#include <QHash>
+#include <QIcon>
+#include <QProxyStyle>
+
+/**
+	@brief The QETStyle class
+	A proxy over the running widget style that gives icons a hover state.
+
+	QToolButton, QTabBar and item views ask the application style for the
+	QIcon::Active pixmap of an icon while the mouse is over it. Every
+	built-in style returns the icon unchanged for that mode, so only the
+	button frame changes on hover, and on a dark palette Fusion's frame is
+	too faint to see (GitHub #870). This proxy answers QIcon::Active for
+	line-art icons with the icon tinted in the palette's highlight color,
+	lightened when needed to reach 3:1 on a button face, so the icon
+	itself changes on both light and dark palettes. Colored icons keep
+	their colors. Every other mode is left 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 hover 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 the icon in the highlighted-text color.
+*/
+class QETStyle : public QProxyStyle
+{
+	Q_OBJECT
+
+	public:
+		explicit QETStyle(QStyle *base);
+		~QETStyle() override = default;
+
+		QPixmap generatedIconPixmap(QIcon::Mode mode,
+		                            const QPixmap &pixmap,
+		                            const QStyleOption *option) const override;
+		void drawControl(ControlElement element,
+		                 const QStyleOption *option,
+		                 QPainter *painter,
+		                 const QWidget *widget = nullptr) const override;
+
+		/// True when fewer than a fifth of the visible pixels are saturated.
+		static bool isLineArt(const QImage &image);
+		/// The highlight color, lightened until it reads at 3:1 on a button.
+		static QColor hoverColor(const QPalette &palette);
+		/// pixmap with every pixel set to color, alpha kept.
+		static QPixmap tinted(const QPixmap &pixmap, const QColor &color);
+
+	private:
+		QIcon menuIcon(const QIcon &icon, const QPalette &palette, int size, qreal dpr) const;
+		mutable QHash<QString, QIcon> menu_icons_;
+};
+
+#endif
@@ -96,7 +96,9 @@ add_executable(
  tst_qetpalette.cpp
  inkcontrast.h
  ${QET_DIR}/sources/qetpalette.cpp
-  ${QET_DIR}/sources/qetpalette.h)
+  ${QET_DIR}/sources/qetpalette.h
+  ${QET_DIR}/sources/ElementsCollection/elementpreviewdelegate.cpp
+  ${QET_DIR}/sources/ElementsCollection/elementpreviewdelegate.h)
 add_test(NAME tst_qetpalette COMMAND tst_qetpalette)
 target_include_directories(tst_qetpalette PRIVATE ${QET_DIR}/sources)
 target_link_libraries(tst_qetpalette PRIVATE Qt::Test Qt::Widgets)
@@ -110,6 +112,7 @@ add_executable(
  ${QET_DIR}/sources/qeticons.cpp
  ${QET_DIR}/sources/qeticons.h
  ${QET_DIR}/sources/qetpalette.cpp
+  ${QET_DIR}/sources/qetstyle.cpp
  ${QET_DIR}/sources/qetpalette.h
  ${QET_DIR}/ico/icon-themes.qrc)
 add_test(NAME tst_qeticons COMMAND tst_qeticons)
@@ -38,9 +38,8 @@ namespace QET {
 			image is also written there as <row>-<name>.png so a failure
 			can be looked at.
 		*/
-		inline QImage grab(QWidget *widget, const char *name)
+		inline QImage dump(const QImage &image, const char *name)
 		{
-			const QImage image = widget->grab().toImage();
 			const QByteArray dir = qgetenv("QET_TEST_DUMP_DIR");
 			if (!dir.isEmpty())
 				image.save(QString("%1/%2-%3.png").arg(QString::fromLocal8Bit(dir),
@@ -48,28 +47,55 @@ namespace QET {
 			return image;
 		}

+		inline QImage grab(QWidget *widget, const char *name)
+		{
+			return dump(widget->grab().toImage(), name);
+		}
+
 		/**
 			Contrast between the background of a rendered widget (its most
 			frequent color) and the ink drawn on it (the pixel whose
 			luminance differs most from the background), inside rect.
 		*/
-		inline double inkContrast(const QImage &image, const QRect &rect)
+		inline QHash<QRgb, int> histogram(const QImage &image, const QRect &rect)
 		{
-			QHash<QRgb, int> histogram;
+			QHash<QRgb, int> counts;
 			for (int y = rect.top(); y <= rect.bottom(); ++y)
 				for (int x = rect.left(); x <= rect.right(); ++x)
-					++histogram[image.pixel(x, y)];
+					++counts[image.pixel(x, y)];
+			return counts;
+		}

-			QRgb background = 0;
+		/// The most frequent color inside rect.
+		inline QRgb background(const QImage &image, const QRect &rect)
+		{
+			const QHash<QRgb, int> counts = histogram(image, rect);
+			QRgb color = 0;
 			int best = -1;
-			for (auto it = histogram.cbegin(); it != histogram.cend(); ++it)
-				if (it.value() > best) { best = it.value(); background = it.key(); }
+			for (auto it = counts.cbegin(); it != counts.cend(); ++it)
+				if (it.value() > best) { best = it.value(); color = it.key(); }
+			return color;
+		}

+		/// The color inside rect that contrasts most with the background: the ink.
+		inline QRgb ink(const QImage &image, const QRect &rect)
+		{
+			const QHash<QRgb, int> counts = histogram(image, rect);
+			const QColor bg(background(image, rect));
+			QRgb color = bg.rgb();
 			double contrast = 1.0;
-			for (auto it = histogram.cbegin(); it != histogram.cend(); ++it)
-				contrast = qMax(contrast, QET::Palette::contrastRatio(QColor(background),
-				                                                      QColor(it.key())));
-			return contrast;
+			for (auto it = counts.cbegin(); it != counts.cend(); ++it)
+			{
+				const double c = QET::Palette::contrastRatio(bg, QColor(it.key()));
+				if (c > contrast) { contrast = c; color = it.key(); }
+			}
+			return color;
+		}
+
+		inline double inkContrast(const QImage &image, const QRect &rect)
+		{
+			return QET::Palette::contrastRatio(QColor(background(image, rect)),
+			                                   QColor(ink(image, rect)));
 		}
 	}
 }
@@ -21,6 +21,12 @@
 #include <QMenuBar>
 #include <QShortcut>

+#ifdef Q_OS_MACOS
+// Exported from QtGui but declared in qkeysequence.h only for the
+// documentation build; Qt's own docs say to declare it like this.
+Q_GUI_EXPORT void qt_set_sequence_auto_mnemonic(bool b);
+#endif
+
 /*
 	F10 should open the menu bar, as it does in most applications and as
 	someone working without a mouse will expect. Qt provides this on Windows
@@ -38,6 +44,7 @@ class TstMenuBarKeyboard : public QObject
 	Q_OBJECT

 	private slots:
+		void initTestCase();
 		void altLetterOpensMenu();      // control -- must pass, or nothing below means anything
 		void plainF10DoesNothingInQt(); // the gap being filled
 		void shortcutOpensMenuBar();    // the mechanism QETMainWindow uses
@@ -48,6 +55,13 @@ namespace {
 QMainWindow *makeWindow(QMenu **file_menu)
 {
 	auto *w = new QMainWindow;
+#ifdef Q_OS_MACOS
+	// A QMenuBar is native on macOS: its menus live in the system menu
+	// bar, outside the Qt widget tree, where QTest key events never reach
+	// them and QMenu::isVisible() stays false. The in-window bar runs the
+	// same QMenuBar code the other platforms use.
+	w->menuBar()->setNativeMenuBar(false);
+#endif
 	*file_menu = w->menuBar()->addMenu(QStringLiteral("&File"));
 	(*file_menu)->addAction(QStringLiteral("Quit"));
 	w->menuBar()->addMenu(QStringLiteral("&Edit"))->addAction(QStringLiteral("Copy"));
@@ -60,6 +74,18 @@ QMainWindow *makeWindow(QMenu **file_menu)

 }

+/*
+	macOS has no Alt+letter menu mnemonics, so Qt does not turn "&File"
+	into a shortcut there (qt_set_sequence_auto_mnemonic is off). The
+	control below needs one; switch mnemonics on for this process.
+*/
+void TstMenuBarKeyboard::initTestCase()
+{
+#ifdef Q_OS_MACOS
+	qt_set_sequence_auto_mnemonic(true);
+#endif
+}
+
 /*
 	The control. Alt and a menu's letter is known to work, so if this fails
 	the environment cannot open menus at all and the other two tests are
@@ -18,15 +18,20 @@
 #include <QtTest>
 #include <QApplication>
 #include <QDir>
+#include <QFile>
 #include <QIcon>
 #include <QMainWindow>
+#include <QMenu>
+#include <QPainter>
 #include <QStyleFactory>
+#include <QStyleOption>
 #include <QToolBar>
 #include <QToolButton>

 #include "inkcontrast.h"
 #include "qeticons.h"
 #include "qetpalette.h"
+#include "qetstyle.h"

 /**
 	Checks on QET's two icon themes, "qet" and "qet-dark", generated by
@@ -34,11 +39,15 @@
 	table that uses them.

 	Every icon name must resolve in both themes. The dark theme's files
-	must be light ink. A toolbar button painted with Fusion must show its
-	icon at 3:1 (WCAG 1.4.11) in both themes, with the disabled state
-	reading weaker than the enabled one, which is what was reversed on
-	macOS before (GitHub #466, #870). And the icons the elements panel
-	draws in its 50 px slots must stay small.
+	must read on the dark palette, and an icon drawn as a light object
+	(a page sheet, the PDF import icon of GitHub #919) must come through
+	the dark theme untouched rather than inverted into a black page.
+	QET's own vector icons must serve every size in both themes. A
+	toolbar button painted with Fusion must show its icon at 3:1 (WCAG
+	1.4.11) in both themes, with the disabled state reading weaker than
+	the enabled one, which is what was reversed on macOS before (GitHub
+	#466, #870). And the icons the elements panel draws in its 50 px
+	slots must stay small.
 */
 class tst_qeticons : public QObject
 {
@@ -47,9 +56,16 @@ class tst_qeticons : public QObject
 	private slots:
 		void initTestCase();
 		void everyIconResolvesInBothThemes();
-		void darkThemeFilesAreLightInk();
+		void darkThemeFilesReadOnDarkPalette();
+		void lightIconsStayLightInDarkTheme();
+		void scalableIconsServeEverySize();
 		void toolbarIconIsReadable_data();
 		void toolbarIconIsReadable();
+		void hoverChangesTheIcon_data();
+		void hoverChangesTheIcon();
+		void coloredIconKeepsItsColorsOnHover();
+		void menuIconReadsOnHighlight_data();
+		void menuIconReadsOnHighlight();
 		void panelProjectIconStaysSmall();
 };

@@ -70,18 +86,26 @@ namespace {
 		return names;
 	}

-	/// Lightness of the lightest visible pixel: the ink, in a dark-theme file.
-	double maxLightness(const QImage &image)
+	/**
+		Mean color of the visible pixels: what the icon reads as, taken
+		as a whole, on the background behind it. A page-shaped icon whose
+		white body was inverted keeps a light border, so the lightest
+		pixel would pass it; the mean does not.
+	*/
+	QColor meanVisibleColor(const QImage &image)
 	{
-		double max = 0.0;
+		qint64 r = 0, g = 0, b = 0, n = 0;
 		for (int y = 0; y < image.height(); ++y)
 			for (int x = 0; x < image.width(); ++x)
 			{
 				const QColor c = image.pixelColor(x, y);
-				if (c.alpha() > 64) max = qMax(max, c.lightnessF());
+				if (c.alpha() <= 64) continue;
+				r += c.red(); g += c.green(); b += c.blue(); ++n;
 			}
-		return max;
+		return n ? QColor(r / n, g / n, b / n) : QColor();
 	}
+
+	const QStringList kSizes = {"16x16", "22x22", "32x32", "48x48", "128x128"};
 }

 void tst_qeticons::initTestCase()
@@ -111,27 +135,109 @@ void tst_qeticons::everyIconResolvesInBothThemes()
 		QVERIFY2(!QIcon::fromTheme(name).pixmap(22).isNull(), qPrintable(name));
 }

-void tst_qeticons::darkThemeFilesAreLightInk()
+/**
+	Every file the generator put in the dark theme, taken as a whole,
+	must reach 3:1 against the dark palette's window color. Inverted
+	line art passes by a wide margin; an inverted light object (a white
+	page turned black) sits below 2:1 and fails, which is the defect
+	misc/make_icon_themes.py now avoids by leaving such icons to the
+	light theme.
+*/
+void tst_qeticons::darkThemeFilesReadOnDarkPalette()
 {
+	const QColor window = QET::Palette::fusionDark().color(QPalette::Active, QPalette::Window);
 	int checked = 0;
-	for (const QString &size : {"16x16", "22x22", "32x32"})
+	for (const QString &size : kSizes)
 	{
 		QDir dir(QString(":/ico/themes/qet-dark/%1").arg(size));
 		for (const QString &file : dir.entryList({"*.png"}, QDir::Files))
 		{
 			const QImage dark(dir.filePath(file));
-			const QImage light(QString(":/ico/themes/qet/%1/%2").arg(size, file));
-			QVERIFY2(!dark.isNull() && !light.isNull(), qPrintable(file));
-			// A page-shaped icon keeps its white fill dark after inversion,
-			// so the mean would mislead; what matters is that the ink is light.
-			QVERIFY2(maxLightness(dark) >= 0.8,
-			         qPrintable(QString("%1/%2 has no light ink").arg(size, file)));
+			QVERIFY2(!dark.isNull(), qPrintable(file));
+			const QColor mean = meanVisibleColor(dark);
+			QVERIFY2(mean.isValid(), qPrintable(file));
+			const double contrast = QET::Palette::contrastRatio(mean, window);
+			QVERIFY2(contrast >= kIconRatio,
+			         qPrintable(QString("%1/%2 reads %3:1 on the dark window").arg(size, file).arg(contrast)));
 			++checked;
 		}
 	}
 	QVERIFY(checked > 100);
 }

+/**
+	Icons drawn as a light object are not in the dark theme; the theme
+	inherits them from "qet". Asking the dark theme for them must return
+	the light art, not a dark page (GitHub #919, the PDF import icon).
+*/
+void tst_qeticons::lightIconsStayLightInDarkTheme()
+{
+	const QColor window = QET::Palette::fusionDark().color(QPalette::Active, QPalette::Window);
+	QIcon::setThemeName(QStringLiteral("qet-dark"));
+	// The folio family is an SVG from 22 px up; their 16 px files are
+	// still the light page art, as is the background swatch at 22 px.
+	const QList<QPair<QString, int>> icons = {
+		{"diagram", 16}, {"label", 16}, {"folio-new", 16}, {"folio-delete", 16},
+		{"folio-properties", 16}, {"diagram_bg", 22}};
+	for (const auto &[name, size] : icons)
+	{
+		QVERIFY2(!QFile::exists(QString(":/ico/themes/qet-dark/%1x%1/%2.png").arg(size).arg(name)),
+		         qPrintable(QString("%1 has a dark copy; the generator inverted a light icon").arg(name)));
+		const QImage image = QIcon::fromTheme(name).pixmap(size).toImage();
+		QVERIFY2(!image.isNull(), qPrintable(name));
+		const QColor mean = meanVisibleColor(image);
+		QVERIFY2(mean.lightnessF() > 0.6,
+		         qPrintable(QString("%1 comes out dark in the dark theme (lightness %2)")
+		                    .arg(name).arg(mean.lightnessF())));
+		QVERIFY2(QET::Palette::contrastRatio(mean, window) >= kIconRatio, qPrintable(name));
+	}
+}
+
+/**
+	QET's own vector icons live in ico/scalable/: one file for every size
+	from the toolbar up, with a recolored copy in the dark theme. Each
+	must resolve in both themes at 22, 24, 32 and 64 px, dark ink on the
+	light theme and light ink on the dark one, with no 22 px PNG left
+	beside it. Fusion's toolbar slot is 24 px, so the files are drawn on
+	a 24 px canvas and their one pixel lines land on whole pixels there.
+*/
+void tst_qeticons::scalableIconsServeEverySize()
+{
+	const QDir scalable(":/ico/themes/qet/scalable");
+	QStringList names;
+	for (const QString &file : scalable.entryList({"*.svg"}, QDir::Files))
+		names << file.section('.', 0, -2);
+	for (const QString &name : {"pdf-import", "folio-new", "folio-delete", "folio-properties", "diagram", "label"})
+		QVERIFY2(names.contains(name), qPrintable(name + " is not in the scalable folder"));
+
+	const QByteArray dump = qgetenv("QET_TEST_DUMP_DIR");
+	for (const QString &name : names)
+	{
+		QVERIFY2(QFile::exists(QString(":/ico/themes/qet-dark/scalable/%1.svg").arg(name)), qPrintable(name));
+		QVERIFY2(!QFile::exists(QString(":/ico/themes/qet/22x22/%1.png").arg(name)),
+		         qPrintable(QString("%1 still has a 22 px PNG that hides the SVG").arg(name)));
+		for (const QString &theme : {"qet", "qet-dark"})
+		{
+			QIcon::setThemeName(theme);
+			const QIcon icon = QIcon::fromTheme(name);
+			QVERIFY2(!icon.isNull(), qPrintable(name));
+			for (int size : {22, 24, 32, 64})
+			{
+				const QPixmap pixmap = icon.pixmap(size);
+				QCOMPARE(pixmap.width(), size);
+				if (!dump.isEmpty())
+					pixmap.save(QString("%1/%2-%3-%4.png").arg(QString::fromLocal8Bit(dump), name, theme).arg(size));
+				const QColor mean = meanVisibleColor(pixmap.toImage());
+				QVERIFY2(mean.isValid(), qPrintable(QString("%1 in %2 at %3 px is empty").arg(name, theme).arg(size)));
+				if (theme == "qet")
+					QVERIFY2(mean.lightnessF() < 0.5, qPrintable(QString("%1 light theme at %2 px: lightness %3").arg(name).arg(size).arg(mean.lightnessF())));
+				else
+					QVERIFY2(mean.lightnessF() > 0.6, qPrintable(QString("%1 dark theme at %2 px: lightness %3").arg(name).arg(size).arg(mean.lightnessF())));
+			}
+		}
+	}
+}
+
 void tst_qeticons::toolbarIconIsReadable_data()
 {
 	QTest::addColumn<QString>("theme");
@@ -178,6 +284,169 @@ void tst_qeticons::toolbarIconIsReadable()
 	                    .arg(disabled_contrast).arg(enabled_contrast)));
 }

+namespace {
+	/**
+		Paint a tool button through the style with the given extra states,
+		the way QToolButton::paintEvent does, so hover can be rendered
+		without a real pointer.
+	*/
+	QImage renderToolButton(QToolButton *button, QStyle::State extra, const char *name)
+	{
+		QStyleOptionToolButton option;
+		option.initFrom(button);
+		option.state |= QStyle::State_Enabled | QStyle::State_AutoRaise | QStyle::State_Raised | extra;
+		option.icon = button->icon();
+		option.iconSize = button->iconSize();
+		option.subControls = QStyle::SC_ToolButton;
+		option.features = QStyleOptionToolButton::None;
+		option.toolButtonStyle = Qt::ToolButtonIconOnly;
+
+		QImage image(button->size(), QImage::Format_ARGB32_Premultiplied);
+		image.fill(option.palette.color(QPalette::Window));
+		QPainter painter(&image);
+		button->style()->drawComplexControl(QStyle::CC_ToolButton, &option, &painter, button);
+		painter.end();
+		return QET::Test::dump(image, name);
+	}
+
+	QToolButton *toolButton(QMainWindow &window, const QIcon &icon)
+	{
+		QToolBar *toolbar = window.addToolBar("view");
+		auto *button = new QToolButton;
+		button->setIcon(icon);
+		button->setAutoRaise(true);
+		toolbar->addWidget(button);
+		window.resize(300, 100);
+		window.show();
+		return button;
+	}
+}
+
+void tst_qeticons::hoverChangesTheIcon_data()
+{
+	QTest::addColumn<QString>("theme");
+	QTest::addColumn<QPalette>("palette");
+	QTest::addColumn<bool>("checked");
+	QTest::newRow("light") << "qet" << QET::Palette::fusionLight() << false;
+	QTest::newRow("dark") << "qet-dark" << QET::Palette::fusionDark() << false;
+	// A toggle that is on: Fusion draws it sunken, and hovering it changes
+	// nothing in the frame, so the icon is the only hover signal there.
+	QTest::newRow("light-checked") << "qet" << QET::Palette::fusionLight() << true;
+	QTest::newRow("dark-checked") << "qet-dark" << QET::Palette::fusionDark() << true;
+}
+
+/**
+	Hovering a line-art icon must change the icon itself, not only the
+	button frame, and the hovered icon must still reach 3:1 (GitHub #870).
+	QETStyle answers QIcon::Active with the icon tinted in the highlight
+	color; the built-in styles return it unchanged.
+*/
+void tst_qeticons::hoverChangesTheIcon()
+{
+	QFETCH(QString, theme);
+	QFETCH(QPalette, palette);
+	QFETCH(bool, checked);
+	QIcon::setThemeName(theme);
+	QApplication::setStyle(new QETStyle(QStyleFactory::create("Fusion")));
+	QApplication::setPalette(palette);
+
+	QMainWindow window;
+	QToolButton *button = toolButton(window, QIcon::fromTheme("zoom-fit-best"));
+	button->setCheckable(checked);
+	button->setChecked(checked);
+	QVERIFY(QTest::qWaitForWindowExposed(&window));
+
+	const QStyle::State on = checked ? (QStyle::State_On | QStyle::State_Sunken) : QStyle::State_None;
+	const QImage normal = renderToolButton(button, on, "normal");
+	const QImage hover = renderToolButton(button, on | QStyle::State_MouseOver, "hover");
+	// Inside the frame Fusion draws around a hovered button, so the ink
+	// measured is the icon's, not the frame's.
+	const QRect inside = button->rect().adjusted(3, 3, -3, -3);
+	const QColor normal_ink(QET::Test::ink(normal, inside));
+	const QColor hover_ink(QET::Test::ink(hover, inside));
+	QVERIFY2(hover_ink != normal_ink,
+	         qPrintable(QString("hover leaves the icon ink at %1").arg(normal_ink.name())));
+
+	// The tint, give or take the icon's own anti-aliasing.
+	const QColor expected = QETStyle::hoverColor(palette);
+	const int distance = qMax(qMax(qAbs(hover_ink.red() - expected.red()),
+	                               qAbs(hover_ink.green() - expected.green())),
+	                          qAbs(hover_ink.blue() - expected.blue()));
+	QVERIFY2(distance <= 16,
+	         qPrintable(QString("hovered ink %1, expected %2").arg(hover_ink.name(), expected.name())));
+
+	const double hover_contrast = QET::Test::inkContrast(hover, inside);
+	QVERIFY2(hover_contrast >= kIconRatio,
+	         qPrintable(QString("hovered icon: %1").arg(hover_contrast)));
+}
+
+/**
+	A colored icon (old Oxygen art) is not line art, so hover leaves its
+	pixels alone.
+*/
+void tst_qeticons::coloredIconKeepsItsColorsOnHover()
+{
+	QIcon::setThemeName(QStringLiteral("qet"));
+	QApplication::setStyle(new QETStyle(QStyleFactory::create("Fusion")));
+	QApplication::setPalette(QET::Palette::fusionLight());
+
+	const QIcon icon = QIcon::fromTheme("document-open");   // colored Oxygen art
+	QVERIFY(!icon.isNull());
+	const QPixmap normal = icon.pixmap(QSize(22, 22), 1.0, QIcon::Normal);
+	const QPixmap active = icon.pixmap(QSize(22, 22), 1.0, QIcon::Active);
+	QVERIFY(!QETStyle::isLineArt(normal.toImage()));
+	QCOMPARE(active.toImage(), normal.toImage());
+}
+
+void tst_qeticons::menuIconReadsOnHighlight_data()
+{
+	toolbarIconIsReadable_data();
+}
+
+/**
+	Fusion asks for the QIcon::Active pixmap of a highlighted menu item's
+	icon too, and paints it on the highlight bar. The hover tint would
+	vanish there, so on a menu item the icon must read against the bar at
+	3:1 instead: the same ink as the item's text.
+*/
+void tst_qeticons::menuIconReadsOnHighlight()
+{
+	QFETCH(QString, theme);
+	QFETCH(QPalette, palette);
+	QIcon::setThemeName(theme);
+	QApplication::setStyle(new QETStyle(QStyleFactory::create("Fusion")));
+	QApplication::setPalette(palette);
+
+	QMenu menu;
+	QAction *action = menu.addAction(QIcon::fromTheme("zoom-fit-best"), "Zoom to fit");
+	menu.resize(160, 32);
+
+	QStyleOptionMenuItem option;
+	option.initFrom(&menu);
+	option.state |= QStyle::State_Enabled | QStyle::State_Selected;
+	option.menuItemType = QStyleOptionMenuItem::Normal;
+	option.checkType = QStyleOptionMenuItem::NotCheckable;
+	option.icon = action->icon();
+	option.text = action->text();
+	option.maxIconWidth = 22;
+	option.rect = QRect(0, 0, 160, 24);
+
+	QImage image(160, 24, QImage::Format_ARGB32_Premultiplied);
+	image.fill(palette.color(QPalette::Window));
+	QPainter painter(&image);
+	menu.style()->drawControl(QStyle::CE_MenuItem, &option, &painter, &menu);
+	painter.end();
+	QET::Test::dump(image, "menu-highlight");
+
+	// The icon column: the first maxIconWidth pixels plus Fusion's margin.
+	const QRect icon_column(0, 0, 30, 24);
+	const QColor bar(QET::Test::background(image, icon_column));
+	QCOMPARE(bar, palette.color(QPalette::Active, QPalette::Highlight));
+	const double contrast = QET::Test::inkContrast(image, icon_column);
+	QVERIFY2(contrast >= kIconRatio,
+	         qPrintable(QString("highlighted menu icon: %1").arg(contrast)));
+}
+
 /**
 	The elements panel sets a 50 px icon size so element previews are
 	large. Its project root item uses ProjectFileGP, whose theme name also
@@ -24,11 +24,15 @@
 #include <QLineEdit>
 #include <QMainWindow>
 #include <QPushButton>
+#include <QPainter>
 #include <QRadioButton>
+#include <QStandardItemModel>
+#include <QTreeView>
 #include <QStyleFactory>
 #include <QToolBar>

 #include "inkcontrast.h"
+#include "ElementsCollection/elementpreviewdelegate.h"
 #include "qetpalette.h"

 using QET::Palette::contrastRatio;
@@ -62,6 +66,10 @@ class tst_qetpalette : public QObject
 		void styleIsFusionMatchesObjectName();
 		void renderedWidgetsAreReadable_data();
 		void renderedWidgetsAreReadable();
+		void lineArtRuleSeparatesInkFromColor();
+		void invertedLightnessKeepsHueAndAlpha();
+		void elementPreviewReadsOnBothPalettes();
+		void previewDelegateAdaptsLineArtOnly();

 	private:
 		static void addPaletteRows();
@@ -308,6 +316,127 @@ void tst_qetpalette::renderedWidgetsAreReadable()
 	         qPrintable(QString("line edit text: %1").arg(edit_contrast)));
 }

+namespace {
+	/// A 40 x 40 transparent picture with a 3 px stroke square in color, as
+	/// an element preview is drawn for the white sheet.
+	QImage strokeSquare(const QColor &color)
+	{
+		QImage image(40, 40, QImage::Format_ARGB32);
+		image.fill(Qt::transparent);
+		QPainter painter(&image);
+		painter.setPen(QPen(color, 3));
+		painter.drawRect(6, 6, 27, 27);
+		return image;
+	}
+
+	/// The most frequent color of a rendering: its background.
+	QRgb dominant(const QImage &image)
+	{
+		QHash<QRgb, int> histogram;
+		for (int y = 0; y < image.height(); ++y)
+			for (int x = 0; x < image.width(); ++x)
+				++histogram[image.pixel(x, y)];
+		QRgb best = 0;
+		int count = -1;
+		for (auto it = histogram.cbegin(); it != histogram.cend(); ++it)
+			if (it.value() > count) { count = it.value(); best = it.key(); }
+		return best;
+	}
+}
+
+void tst_qetpalette::lineArtRuleSeparatesInkFromColor()
+{
+	QVERIFY(QET::Palette::isLineArt(strokeSquare(Qt::black)));
+	QVERIFY(QET::Palette::isLineArt(strokeSquare(QColor(80, 80, 80))));
+	QVERIFY(!QET::Palette::isLineArt(strokeSquare(Qt::red)));
+	QVERIFY(!QET::Palette::isLineArt(strokeSquare(QColor(30, 96, 176))));
+	QVERIFY(!QET::Palette::isLineArt(QImage()));
+}
+
+/**
+	Black ink becomes the dark palette's light gray, a colored stroke keeps
+	its hue, and transparency is untouched.
+*/
+void tst_qetpalette::invertedLightnessKeepsHueAndAlpha()
+{
+	const QImage black = QET::Palette::invertedLightness(strokeSquare(Qt::black));
+	QCOMPARE(black.pixelColor(6, 20).alpha(), 255);
+	QVERIFY2(black.pixelColor(6, 20).lightnessF() > 0.8, "black ink did not become light");
+	QCOMPARE(black.pixelColor(20, 20).alpha(), 0);
+
+	const QImage red = QET::Palette::invertedLightness(strokeSquare(Qt::red));
+	const QColor stroke = red.pixelColor(6, 20);
+	QVERIFY2(qAbs(stroke.hslHueF() - QColor(Qt::red).hslHueF()) < 0.02, "hue changed");
+	QVERIFY(stroke.hslSaturationF() > 0.9);
+}
+
+/**
+	An element preview drawn for the white sheet must read at 3:1 on the
+	Base color of both palettes: unchanged on the light one, inverted on
+	the dark one.
+*/
+void tst_qetpalette::elementPreviewReadsOnBothPalettes()
+{
+	const QPixmap preview = QPixmap::fromImage(strokeSquare(Qt::black));
+	for (const QPalette &palette : {QET::Palette::fusionLight(), QET::Palette::fusionDark()})
+	{
+		const QColor base = palette.color(QPalette::Active, QPalette::Base);
+		const QPixmap shown = QET::Palette::forPalette(preview, palette);
+		QImage row(shown.size(), QImage::Format_ARGB32);
+		row.fill(base);
+		QPainter painter(&row);
+		painter.drawPixmap(0, 0, shown);
+		painter.end();
+		const double contrast = QET::Test::inkContrast(row, row.rect());
+		QVERIFY2(contrast >= 3.0, qPrintable(QString("preview reads %1:1 on Base %2").arg(contrast).arg(base.name())));
+	}
+	// A light palette hands the picture back untouched.
+	QCOMPARE(QET::Palette::forPalette(preview, QET::Palette::fusionLight()).cacheKey(), preview.cacheKey());
+}
+
+/**
+	In a tree on the dark palette, the delegate inverts a line-art icon so
+	it reads on the row, and leaves a colored icon (a folder) as it is.
+*/
+void tst_qetpalette::previewDelegateAdaptsLineArtOnly()
+{
+	QApplication::setStyle(QStyleFactory::create("Fusion"));
+	QApplication::setPalette(QET::Palette::fusionDark());
+
+	QStandardItemModel model;
+	auto *element = new QStandardItem(QIcon(QPixmap::fromImage(strokeSquare(Qt::black))), "element");
+	auto *folder = new QStandardItem(QIcon(QPixmap::fromImage(strokeSquare(QColor(30, 96, 176)))), "folder");
+	model.appendRow(element);
+	model.appendRow(folder);
+
+	QTreeView view;
+	view.setModel(&model);
+	view.setIconSize(QSize(40, 40));
+	view.setItemDelegate(new ElementPreviewDelegate(&view));
+	view.resize(300, 200);
+	view.show();
+	QVERIFY(QTest::qWaitForWindowExposed(&view));
+
+	const QImage image = view.viewport()->grab().toImage();
+	const QRect element_icon(view.visualRect(element->index()).topLeft(), QSize(40, 40));
+	const QRect folder_icon(view.visualRect(folder->index()).topLeft(), QSize(40, 40));
+	const QColor base = QET::Palette::fusionDark().color(QPalette::Active, QPalette::Base);
+	QCOMPARE(QColor(dominant(image)), base);
+
+	const double element_contrast = QET::Test::inkContrast(image, element_icon);
+	QVERIFY2(element_contrast >= 3.0, qPrintable(QString("element preview reads %1:1 on the dark row").arg(element_contrast)));
+
+	// The folder icon keeps its blue: some pixel in its slot is still saturated blue.
+	bool blue = false;
+	for (int y = folder_icon.top(); y <= folder_icon.bottom() && !blue; ++y)
+		for (int x = folder_icon.left(); x <= folder_icon.right() && !blue; ++x)
+		{
+			const QColor c = image.pixelColor(x, y);
+			blue = c.hslSaturationF() > 0.5 && c.blue() > c.red() + 60;
+		}
+	QVERIFY2(blue, "the colored icon lost its color");
+}
+
 int main(int argc, char **argv)
 {
 	// Widgets are painted for real, on Qt's offscreen platform so the test
Author	SHA1	Message	Date
Laurent Trinques	ef1fbd79b4	Merge pull request #942 from elevatormind/gitignore-ide-addition Linux build and tests / Build and test (Qt 6, Debug) (push) Failing after 2m1s Details chore: ignore IDE settings and cache files	2026-09-19 20:25:12 +02:00
Laurent Trinques	eb7abdfbc6	Merge pull request #946 from jp2images/feature-panels-follow-palette Let the Collections and Projects panels follow the palette	2026-09-19 20:24:05 +02:00
Laurent Trinques	f574d28340	Merge pull request #947 from jp2images/fix-dark-theme-light-icons Redraw the Add PDF and folio icons as SVGs, stop inverting page-shaped icons in the dark theme	2026-09-19 20:22:29 +02:00
Laurent Trinques	31f90e2c46	Merge pull request #949 from jp2images/fix-menubar-test-macos Make the menu bar keyboard test pass on macOS	2026-09-19 20:20:58 +02:00
Laurent Trinques	45bd8256b3	Merge pull request #950 from jp2images/feature-icon-hover Give icons a hover state through a proxy style	2026-09-19 20:18:20 +02:00
Jeff Patterson	4e43cde063	Give icons a hover state through a proxy style 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.	2026-09-19 12:26:06 -05:00
Jeff Patterson	aef56fe41d	Make the menu bar keyboard test pass on macOS tst_menubarkeyboard's control case presses Alt+F and expects the File menu to open. On macOS it never did, for two reasons unrelated to the F10 shortcut it guards: a QMenuBar is native there, so its menus live in the system menu bar where QTest key events do not reach them, and Qt does not turn "&File" into an Alt+F mnemonic on macOS at all. The test has failed on every Mac build since `bd6bed8d6` added it. On macOS the test now uses an in-window menu bar and switches auto mnemonics on for its own process, which runs the same QMenuBar code the other platforms exercise. What it still does not prove on macOS is the native bar: QETMainWindow::activateMenuBar() calls setActiveAction() on a bar the system draws, and only F10 in the running application can say what that does there. Other platforms are unchanged. Fixes #948.	2026-09-19 12:24:57 -05:00
Jeff Patterson	0395f90f75	Let the Collections and Projects panels follow the palette 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.	2026-09-19 12:22:24 -05:00
Jeff Patterson	a4d5b7a12a	Draw the folio icons as SVGs The folio icons (Add, Remove, Properties, New folio, Title block template) were anti-aliased gray page drawings, and the previous commit left them untouched on the dark palette, where their soft gray fills read blurry next to the line-art icons. They are now pixel-grid SVGs in ico/scalable/ in the style of the Add PDF icon: a landscape sheet with a title block line, a plus or minus badge in the corner, text lines for properties, a filled title block for the template. Same 24 pixel canvas as pdf-import.svg, same currentColor recoloring for the dark theme. Only the 22 pixel PNGs go: five files leave ico/22x22 and both .qrc files, and the alias list in misc/make_icon_themes.py that exposed three of them under a second name is down to conductor2.png. The 16 pixel files stay, so menus and the projects panel keep their icons at that size, and the 128 pixel diagram.png stays for the configuration page list. tests/qttest/tst_qeticons: every file in ico/scalable/ resolves in both themes at 22, 24, 32 and 64 pixels, dark ink on light and light ink on dark, with no 22 pixel PNG left beside it; the light-art check reads the folio family at 16 pixels, where the page art remains.	2026-09-19 12:02:55 -05:00
Jeff Patterson	ba29dc45a0	Draw the Add PDF icon as an SVG The "Add PDF" action used ico/22x22/pdf-import.png, a white page with a red PDF mark that sat apart from its neighbors "Add text" and "Add image", both gray line art in a square frame with a plus. It is now ico/scalable/pdf-import.svg, the same pixel design as insert-image.png: a frame, the letters PDF, a plus in the corner. One file serves every slot and stays sharp on high-DPI screens; the PNG is gone from both .qrc files. The canvas is 24 pixels with the art offset by one, like the Breeze SVGs already in the theme. Fusion's toolbar slot is 24 pixels: a 22 pixel PNG is drawn unscaled inside it, but a scalable icon is rendered at the slot size, and a 22 pixel grid stretched to 24 puts every one pixel line between pixels and reads blurry. The file uses currentColor like the Breeze SVGs already in the theme, so misc/make_icon_themes.py produces the dark copy the same way. A new ico/scalable/ folder holds QET's own vector icons; the direction arummler asked for in #690. tests/qttest/tst_qeticons: the icon resolves in both themes at 16, 22, 32 and 64 pixels, dark ink on the light theme and light ink on the dark one, and no 22 pixel PNG remains.	2026-09-19 12:02:54 -05:00
Jeff Patterson	d06c7be606	Leave light icons out of the dark theme misc/make_icon_themes.py sorted icons by saturation alone, so a white page with a small red mark counted as line art and its dark copy turned the page black: the PDF import icon read black on black (#919, Kellermorph), and the folio, diagram and label icons came out as dark pages with a light border. An icon whose visible pixels are at least 30% near white is now "light art" and inherits from the qet theme untouched; it already reads on a dark toolbar. The generator also removes dark files it no longer produces, so a reclassified icon falls back to the light theme instead of keeping a stale copy. Thirteen files leave ico/themes/qet-dark. tests/qttest/tst_qeticons: every dark theme file, taken as its mean visible color, reaches 3:1 on the dark palette's window color; the lightest-pixel check it replaces let a black page with a light border through. Asking the dark theme for pdf-import, diagram, label, the folio icons and diagram_bg returns the light art.	2026-09-19 12:02:54 -05:00
Magnus Hellströmer	56cbd6e23d	chore: ignore IDE settings and cache files	2026-09-19 18:10:37 +02:00