1 files changed, 187 insertions, 0 deletions
diff --git a/src/monthview.cpp b/src/monthview.cpp
new file mode 100644
index 0000000..7d0df3b
--- /dev/null
+++ b/src/monthview.cpp
@@ -0,0 +1,187 @@
+/*
+ * 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));
+}