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+/*
+ * qtmaildir - a Qt6 mail client for notmuch-indexed Maildirs
+ * Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#pragma once
+
+#include "tagchip.h"
+
+/// Paints a whole card: three lines, all of it, including the tag chips.
+///
+/// It replaces both SubjectDelegate and ThreadListView::paintEvent. The view
+/// used to paint the tag strip because a delegate cannot paint outside its
+/// column and the strip spanned all five; with one column there is nothing to
+/// span, so the strip comes home to the delegate and the view stops painting
+/// entirely. That removes the two failure modes CLAUDE.md records for the
+/// strip, a deleted row cut in half and every other row showing a bare stripe,
+/// both of which existed because the view had to re-honour alternating
+/// colours, the selection and BackgroundRole across cells it did not own.
+///
+/// Inherits RowStyleDelegate for its one job, which still matters: Qt resolves
+/// Qt::ForegroundRole into the palette's Text roles and then prefers those over
+/// HighlightedText, so the read/unread dimming would otherwise win on a
+/// selected row and land as grey on the highlight colour.
+class CardDelegate : public RowStyleDelegate
+{
+    Q_OBJECT
+public:
+    using RowStyleDelegate::RowStyleDelegate;
+
+    void paint(QPainter *painter, const QStyleOptionViewItem &option,
+               const QModelIndex &index) const override;
+    QSize sizeHint(const QStyleOptionViewItem &option,
+                   const QModelIndex &index) const override;
+
+    /// The expander's rect for a row, so the VIEW can hit-test a click without
+    /// duplicating the layout. The delegate draws it and the view owns the
+    /// click, because a delegate gets no click of its own without an editor.
+    static QRect expanderRectFor(const QStyleOptionViewItem &option,
+                                 const QModelIndex &index);
+
+    /// The colour the accent bar is painted in: the account's own, undiluted.
+    ///
+    /// Blending it toward the palette's Base was tried first, at the 0.35
+    /// weight threadLineColour() uses, and produced an INVISIBLE bar on a dark
+    /// theme: against a Base of (0.169, 0.169, 0.169) it landed at (0.18, 0.22,
+    /// 0.26), which is the background. The weight is a fraction OF THE ACCOUNT
+    /// COLOUR, so a low one keeps the background rather than the hue.
+    ///
+    /// An account colour is already chosen to be a chip's fill with legible
+    /// text on top, so it is muted to begin with; three pixels of a muted
+    /// colour is nothing. Nothing is drawn on this bar, so it needs none of the
+    /// contrast that choice was made for. The SPINE is where the muting belongs
+    /// and is blended in paint(): it runs the full height of every reply in an
+    /// expansion and has to be followable without competing with the senders.
+    ///
+    /// Falls back to threadLineColour() for a thread with no account tag.
+    static QColor accentLineColour(const QColor &accountColour);
+};