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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 "monthview.h"
#include "monthlayout.h"
#include <QLocale>
#include <QMouseEvent>
#include <QPainter>
MonthView::MonthView(QWidget *parent)
: QWidget(parent),
m_year(QDate::currentDate().year()), m_month(QDate::currentDate().month())
{
setMinimumSize(420, 320);
}
void MonthView::setMonth(int year, int month)
{
m_year = year;
m_month = month;
update();
}
void MonthView::setItems(const QList<CalendarItem> &items)
{
m_items = items;
m_selected = -1;
update();
}
void MonthView::setSelected(int item)
{
m_selected = item;
update();
}
MonthLayout MonthView::layout() const
{
const int line = fontMetrics().height();
return MonthLayout(rect().adjusted(0, line + 4, 0, 0), m_year, m_month,
QLocale().firstDayOfWeek(), line + 2, line + 2);
}
QDate MonthView::firstDay() const { return layout().dateAt(0); }
QDate MonthView::lastDay() const { return layout().dateAt(MonthLayout::kCells - 1).addDays(1); }
QList<QList<int>> MonthView::itemsPerCell(const MonthLayout &l) const
{
QList<QList<int>> cells(MonthLayout::kCells);
for (int i = 0; i < m_items.size(); ++i) {
const Occurrence &o = m_items[i].occurrence;
QDate day = o.start.toLocalTime().date();
// The end is exclusive: an event ending at midnight does not touch
// the day that midnight begins.
const QDate last = o.end > o.start ? o.end.toLocalTime().addMSecs(-1).date() : day;
for (; day <= last; day = day.addDays(1)) {
const int cell = l.cellOf(day);
if (cell >= 0)
cells[cell].append(i);
}
}
return cells;
}
void MonthView::paintEvent(QPaintEvent *)
{
QPainter p(this);
p.fillRect(rect(), palette().base());
const MonthLayout l = layout();
const QLocale locale;
const int line = fontMetrics().height();
// Weekday header.
for (int col = 0; col < 7; ++col) {
const QRect cell = l.cellRect(col);
const int dow = (locale.firstDayOfWeek() - 1 + col) % 7 + 1;
p.setPen(palette().color(QPalette::PlaceholderText));
p.drawText(QRect(cell.left(), 0, cell.width(), line + 4), Qt::AlignCenter,
locale.dayName(dow, QLocale::ShortFormat));
}
const QList<QList<int>> cells = itemsPerCell(l);
const QDate today = QDate::currentDate();
for (int c = 0; c < MonthLayout::kCells; ++c) {
const QRect cell = l.cellRect(c);
const QDate date = l.dateAt(c);
p.setPen(palette().color(QPalette::Mid));
p.drawRect(cell.adjusted(0, 0, -1, -1));
QRect number(cell.left() + 4, cell.top() + 1,
fontMetrics().horizontalAdvance(QStringLiteral("00")) + 8, line);
if (date == today) {
p.setPen(Qt::NoPen);
p.setBrush(palette().highlight());
p.drawRoundedRect(number, line / 2, line / 2);
p.setPen(palette().color(QPalette::HighlightedText));
} else {
p.setPen(palette().color(date.month() == m_month ? QPalette::Text : QPalette::PlaceholderText));
}
p.drawText(number, Qt::AlignCenter, QString::number(date.day()));
const QList<int> &items = cells[c];
const int shown = l.visibleChips(items.size());
for (int slot = 0; slot < shown; ++slot) {
const CalendarItem &item = m_items[items[slot]];
const QRect chip = l.chipRect(c, slot);
if (item.occurrence.allDay) {
p.setPen(Qt::NoPen);
p.setBrush(item.color);
p.drawRoundedRect(chip, 3, 3);
p.setPen(Qt::white);
p.drawText(chip.adjusted(4, 0, -2, 0), Qt::AlignVCenter | Qt::AlignLeft,
fontMetrics().elidedText(item.title, Qt::ElideRight, chip.width() - 6));
} else {
const int dot = chip.height() / 2;
p.setPen(Qt::NoPen);
p.setBrush(item.color);
p.drawEllipse(QRect(chip.left() + 2, chip.center().y() - dot / 2, dot, dot));
p.setPen(palette().color(QPalette::Text));
const QString text = locale.toString(item.occurrence.start.toLocalTime().time(),
QLocale::ShortFormat)
+ QLatin1Char(' ') + item.title;
const QRect textRect = chip.adjusted(dot + 6, 0, 0, 0);
p.drawText(textRect, Qt::AlignVCenter | Qt::AlignLeft,
fontMetrics().elidedText(text, Qt::ElideRight, textRect.width()));
}
if (items[slot] == m_selected) {
p.setPen(QPen(palette().color(QPalette::Highlight), 2));
p.setBrush(Qt::NoBrush);
p.drawRoundedRect(chip, 3, 3);
}
}
if (shown < items.size()) {
p.setPen(palette().color(QPalette::Link));
p.drawText(l.chipRect(c, shown).adjusted(4, 0, 0, 0), Qt::AlignVCenter | Qt::AlignLeft,
tr("+%n more", nullptr, int(items.size() - shown)));
}
}
}
void MonthView::mousePressEvent(QMouseEvent *event)
{
const MonthLayout l = layout();
const int cell = l.cellAt(event->position().toPoint());
if (cell < 0)
return;
const QList<int> items = itemsPerCell(l)[cell];
const int shown = l.visibleChips(items.size());
for (int slot = 0; slot < shown; ++slot) {
if (l.chipRect(cell, slot).contains(event->position().toPoint())) {
emit itemClicked(items[slot]);
return;
}
}
if (shown < items.size() && l.chipRect(cell, shown).contains(event->position().toPoint()))
emit moreClicked(l.dateAt(cell));
}
void MonthView::mouseDoubleClickEvent(QMouseEvent *event)
{
const MonthLayout l = layout();
const int cell = l.cellAt(event->position().toPoint());
if (cell < 0)
return;
// A double-click on a chip is two clicks on the chip, not a new event.
const QList<int> items = itemsPerCell(l)[cell];
for (int slot = 0; slot < l.visibleChips(items.size()); ++slot)
if (l.chipRect(cell, slot).contains(event->position().toPoint()))
return;
emit dayDoubleClicked(l.dateAt(cell));
}
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