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diff --git a/src/monthview.h b/src/monthview.h
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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 "caltypes.h"
+#include "monthlayout.h"
+
+#include <QWidget>
+
+/// The month grid. Paints a MonthLayout; knows nothing of libical, files or
+/// CalEvent, only the CalendarItems it is handed.
+class MonthView : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit MonthView(QWidget *parent = nullptr);
+
+    void setMonth(int year, int month);
+    void setItems(const QList<CalendarItem> &items);
+    /// Index into the items, or -1. Drawn with an outline.
+    void setSelected(int item);
+
+    /// The first and one-past-last day on the grid, for the caller's query.
+    QDate firstDay() const;
+    QDate lastDay() const;
+
+signals:
+    void itemClicked(int item);
+    void dayDoubleClicked(const QDate &day);
+    void moreClicked(const QDate &day);
+
+protected:
+    void paintEvent(QPaintEvent *event) override;
+    void mousePressEvent(QMouseEvent *event) override;
+    void mouseDoubleClickEvent(QMouseEvent *event) override;
+
+private:
+    MonthLayout layout() const;
+    /// Items on each cell, in start order; a multi-day item is on every cell
+    /// it covers (spec, Month view).
+    QList<QList<int>> itemsPerCell(const MonthLayout &layout) const;
+
+    int m_year;
+    int m_month;
+    QList<CalendarItem> m_items;
+    int m_selected = -1;
+};