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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 hue, lifted to a
/// floor of saturation and lightness.
///
/// Two earlier versions were wrong in opposite directions. Blending toward
/// the palette's Base at threadLineColour()'s 0.35 weight produced an
/// INVISIBLE bar on a dark theme, landing at (0.18, 0.22, 0.26) against a
/// Base of (0.169, 0.169, 0.169): the weight is a fraction OF THE ACCOUNT
/// COLOUR, so a low one keeps the background rather than the hue. Passing
/// the raw colour through fixed that and was still too quiet, because an
/// account colour is chosen as a CHIP's fill with legible text on top and
/// is therefore mid-tone by construction.
///
/// A floor, not a repaint: a colour already past it is returned untouched,
/// so a deliberately vivid choice is preserved. Hue is never altered, since
/// hue is the whole information the bar carries and a shifted one would
/// stop matching the account's chip and its swatch in the dropdown.
///
/// The SPINE takes its colour from this and mutes it again in paint(): it
/// runs the full height of every reply in an expansion and has to be
/// followable without competing with the senders, which is a different
/// problem from a 3px edge marker.
///
/// Falls back to threadLineColour() for a thread with no account tag.
static QColor accentLineColour(const QColor &accountColour);
/// A tag chip's colour, drained for the SIBLING tier (item 111).
///
/// Saturation only: hue stays so the tag is still recognisable, and
/// lightness stays so `TagColors::textColourOn()` keeps choosing the same
/// text colour and the chip cannot become unreadable. Exposed for a test,
/// since "muted" has to be asserted on rather than eyeballed.
static QColor mutedChipColour(const QColor &chipColour);
/// The size of one tag chip on a card, for either tier.
///
/// The delegate's own arithmetic rather than a duplicate of it: a test
/// calling `TagChip::sizeFor` directly proves what that function does and
/// nothing about what the delegate ASKS for, which is where the padding
/// scale is chosen. A mutation dropping the scale at the call site
/// survived exactly that kind of test.
static QSize chipSize(const QFontMetrics &metrics, const QString &text,
bool own);
};
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