feat: paint the calendar's month grid and agenda list

1 files changed, 94 insertions, 0 deletions

diff --git a/src/agendaview.cpp b/src/agendaview.cpp
new file mode 100644
index 0000000..1808906
--- /dev/null
+++ b/src/agendaview.cpp
@@ -0,0 +1,94 @@
+/*
+ * 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 "agendaview.h"
+
+#include <QIcon>
+#include <QLocale>
+#include <QPainter>
+#include <QPixmap>
+
+namespace {
+constexpr int kItemRole = Qt::UserRole;      ///< Index into the items, or -1 for a header.
+constexpr int kDayRole = Qt::UserRole + 1;   ///< The header's date.
+}
+
+AgendaView::AgendaView(QWidget *parent) : QListWidget(parent)
+{
+    connect(this, &QListWidget::itemClicked, this, [this](QListWidgetItem *row) {
+        const int item = row->data(kItemRole).toInt();
+        if (item >= 0)
+            emit itemClicked(item);
+    });
+}
+
+void AgendaView::setItems(const QList<CalendarItem> &items)
+{
+    clear();
+    const QLocale locale;
+    QDate current;
+    for (int i = 0; i < items.size(); ++i) {
+        const CalendarItem &item = items[i];
+        // A blank item is a placeholder the window leaves so every row's
+        // index stays the same as the month grid's: skipped, not shown.
+        if (item.title.isEmpty())
+            continue;
+        const QDate day = item.occurrence.start.toLocalTime().date();
+        if (day != current) {
+            current = day;
+            auto *header = new QListWidgetItem(locale.toString(day, QLocale::LongFormat), this);
+            QFont bold = header->font();
+            bold.setBold(true);
+            header->setFont(bold);
+            header->setFlags(Qt::ItemIsEnabled);  // not selectable
+            header->setData(kItemRole, -1);
+            header->setData(kDayRole, day);
+        }
+        const QString when = item.occurrence.allDay
+            ? tr("all day")
+            : tr("%1 - %2").arg(locale.toString(item.occurrence.start.toLocalTime().time(), QLocale::ShortFormat),
+                                locale.toString(item.occurrence.end.toLocalTime().time(), QLocale::ShortFormat));
+        QPixmap swatch(10, 10);
+        swatch.fill(Qt::transparent);
+        QPainter(&swatch).fillRect(swatch.rect(), item.color);
+        auto *row = new QListWidgetItem(QIcon(swatch), when + QStringLiteral("    ") + item.title, this);
+        row->setData(kItemRole, i);
+    }
+}
+
+void AgendaView::setSelected(int item)
+{
+    for (int r = 0; r < count(); ++r) {
+        if (this->item(r)->data(kItemRole).toInt() == item) {
+            setCurrentRow(r);
+            return;
+        }
+    }
+    clearSelection();
+}
+
+void AgendaView::scrollToDay(const QDate &day)
+{
+    for (int r = 0; r < count(); ++r) {
+        const QDate header = item(r)->data(kDayRole).toDate();
+        if (header.isValid() && header >= day) {
+            scrollToItem(item(r), QAbstractItemView::PositionAtTop);
+            return;
+        }
+    }
+}