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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.
*/
#include "tagstrip.h"
#include <QContextMenuEvent>
#include <QFontMetrics>
#include <QPainter>
#include "tagchip.h"
#include "tagcolors.h"
namespace {
/// Text of the chip standing in for tags that did not fit.
QString overflowText(int count)
{
return QStringLiteral("+%1").arg(count);
}
} // namespace
TagStrip::TagStrip(QWidget *parent)
: QWidget(parent)
{
setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
}
void TagStrip::setTagColors(const TagColors *colours)
{
m_tagColors = colours;
update();
}
void TagStrip::setTags(const QStringList &tags)
{
m_tags.clear();
for (const QString &tag : tags) {
// The account tag is shown as a chip in the thread list instead: it
// says which mailbox the thread came from, not what state it is in.
if (!TagColors::isAccountTag(tag))
m_tags.append(tag);
}
m_tags.sort();
relayout();
setVisible(!m_tags.isEmpty());
update();
}
void TagStrip::relayout()
{
m_visible.clear();
m_hidden.clear();
if (m_tags.isEmpty())
return;
const QFontMetrics metrics(font());
// Reserve room for the overflow chip up front. Sizing it for the worst
// case avoids the loop having to back out a chip it already placed.
const int overflowWidth =
TagChip::sizeFor(metrics, overflowText(m_tags.size())).width()
+ TagChip::kSpacing;
int used = 0;
for (int i = 0; i < m_tags.size(); ++i) {
const int chipWidth =
TagChip::sizeFor(metrics, m_tags.at(i)).width() + TagChip::kSpacing;
const bool isLast = (i == m_tags.size() - 1);
// Every chip but the last must also leave room for the overflow chip,
// since anything after it will be hidden.
const int needed = used + chipWidth + (isLast ? 0 : overflowWidth);
if (needed > width() && !m_visible.isEmpty()) {
m_hidden = m_tags.mid(i);
break;
}
m_visible.append(m_tags.at(i));
used += chipWidth;
}
setToolTip(m_hidden.isEmpty() ? QString()
: m_hidden.join(QStringLiteral(", ")));
}
QSize TagStrip::sizeHint() const
{
const QFontMetrics metrics(font());
return QSize(0, metrics.height() + TagChip::kPaddingY * 2
+ TagChip::kSpacing * 2);
}
void TagStrip::resizeEvent(QResizeEvent *event)
{
QWidget::resizeEvent(event);
relayout();
}
QRect TagStrip::chipRectAt(int index) const
{
if (index < 0 || index >= m_visible.size())
return {};
const QFontMetrics metrics(font());
// Reproduces paintEvent's own vertical placement exactly, which is derived
// from the font's height rather than from the chip's, so a chip whose text
// is shorter than the line still lands on the same baseline.
const int top = (height() - (metrics.height() + TagChip::kPaddingY * 2)) / 2;
int x = 0;
for (int i = 0; i < index; ++i)
x += TagChip::sizeFor(metrics, m_visible.at(i)).width() + TagChip::kSpacing;
return QRect(QPoint(x, top), TagChip::sizeFor(metrics, m_visible.at(index)));
}
QString TagStrip::chipAt(const QPoint &point) const
{
for (int i = 0; i < m_visible.size(); ++i) {
if (chipRectAt(i).contains(point))
return m_visible.at(i);
}
// Deliberately nothing for the overflow chip and for empty space: the +N
// chip names a list, not a tag.
return {};
}
void TagStrip::contextMenuEvent(QContextMenuEvent *event)
{
const QString tag = chipAt(event->pos());
if (tag.isEmpty()) {
// Ignored rather than accepted, so a parent that offers its own menu
// still gets the chance to show it.
event->ignore();
return;
}
event->accept();
emit tagContextMenuRequested(tag, event->globalPos());
}
void TagStrip::paintEvent(QPaintEvent *)
{
if (m_visible.isEmpty())
return;
QPainter painter(this);
const QFontMetrics metrics(font());
const int top = (height() - (metrics.height() + TagChip::kPaddingY * 2)) / 2;
int x = 0;
for (int i = 0; i < m_visible.size(); ++i) {
const QString &tag = m_visible.at(i);
const QRect rect = chipRectAt(i);
const QColor colour = m_tagColors ? m_tagColors->colourFor(tag)
: TagColors().colourFor(tag);
TagChip::paint(&painter, rect, tag, colour);
x = rect.right() + 1 + TagChip::kSpacing;
}
if (!m_hidden.isEmpty()) {
const QString text = overflowText(m_hidden.size());
const QSize size = TagChip::sizeFor(metrics, text);
TagChip::paint(&painter, QRect(QPoint(x, top), size), text,
QColor(0x44, 0x44, 0x4c));
}
}
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