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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 <QColor>
#include <QFont>
#include <QRect>
#include <QSize>
#include <QString>
#include <QStyledItemDelegate>
class QPainter;
class QFontMetrics;
/// Draws one rounded, filled tag chip. Shared so the account chip in the
/// thread list and the strip under the message pane cannot drift apart.
namespace TagChip {
/// Padding inside a chip and the gap between two of them.
///
/// kPaddingX allows for the rounded ends: the corner radius is half the chip's
/// height, so the leftmost and rightmost few pixels of the fill are curve
/// rather than usable width, and text set closer would touch it.
constexpr int kPaddingX = 9;
constexpr int kPaddingY = 1;
constexpr int kSpacing = 4;
QSize sizeFor(const QFontMetrics &metrics, const QString &text);
/// Paints the chip into `rect`, using `text` and `background`. The text colour
/// is derived from the fill so it stays legible.
void paint(QPainter *painter, const QRect &rect, const QString &text,
const QColor &background);
} // namespace TagChip
/// Makes the selection highlight outrank a model-supplied foreground colour.
///
/// Qt resolves Qt::ForegroundRole into the palette's Text roles and its
/// painting then prefers those over HighlightedText, so a model that supplies
/// a foreground wins even on a selected row. That is wrong for the read/unread
/// dimming, whose colour is blended against the UNSELECTED background: over
/// the selection highlight it lands as grey on the highlight colour, close to
/// unreadable.
///
/// Applied to the columns that have no delegate of their own; SubjectDelegate
/// inherits it for the subject column.
class RowStyleDelegate : public QStyledItemDelegate
{
Q_OBJECT
public:
using QStyledItemDelegate::QStyledItemDelegate;
protected:
void initStyleOption(QStyleOptionViewItem *option,
const QModelIndex &index) const override;
};
/// Item delegate for the subject column: draws the account chip in front of
/// the subject text, so which mailbox a thread came from reads at a glance
/// without a tags column spelling it out.
/// **Install on the subject column only.** It reads AccountLabelRole, which is
/// a property of the row rather than of a cell, so as a view-wide delegate it
/// draws the account chip into every column.
class SubjectDelegate : 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;
/// Vertical breathing room above the subject and below the pill row.
static constexpr int kRowPadding = 4;
/// How far a reply row is indented under its thread.
///
/// Deliberately far wider than Qt's 20px default. A thread row carries an
/// account chip in front of its subject and a reply row does not, so a
/// reply's text starts about a chip's width to the LEFT of its thread's
/// before any indent is applied. 20px does not cover that, and the replies
/// come out looking flush or outdented; this has to beat a chip's width to
/// read as nesting at all.
static constexpr int kReplyIndent = 72;
/// Horizontal room reserved in front of a thread's subject for the
/// expander glyph the delegate draws.
static constexpr int kExpanderWidth = 18;
/// The font the pill strip is drawn in: a size down from the row's own.
///
/// At the same size the pills read as a second row of content competing
/// with the subject, rather than as annotation beneath it. Derived from
/// the row font rather than fixed, so it follows the desktop's font size.
static QFont pillFont(const QFont &rowFont);
/// The height every row gets, tall enough for the subject and a pill strip
/// beneath it. The view applies this itself: a QTableView takes one height
/// for the whole row, so leaving it to a single column's sizeHint would
/// let whichever column the view happens to ask decide.
static int rowHeightFor(const QFont &rowFont);
protected:
/// The height of the band the subject text occupies. Everything below it
/// belongs to ThreadListView's row-wide pill strip.
static int subjectBandHeight(const QStyleOptionViewItem &option);
};
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