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diff --git a/src/busyindicator.h b/src/busyindicator.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 <QProgressBar>
+
+// A progress bar that carries both of the modes this application needs, so the
+// two places that show one do not each configure a bare QProgressBar. The
+// status bar's sync indicator is indeterminate, because mbsync reports no
+// percentage; the composer's send popup drains a determinate bar through its
+// undo countdown and then switches THE SAME widget to indeterminate when the
+// command starts. That switch is why one class exists rather than two.
+//
+// Deliberately no label. MainWindow's status text is m_statusLabel, which is
+// the window's and carries far more than this widget's state, and the send
+// popup's phase text belongs to the popup. A label here would be a third
+// owner of status text.
+class BusyIndicator : public QProgressBar
+{
+    Q_OBJECT
+
+public:
+    explicit BusyIndicator(QWidget *parent = nullptr);
+
+    // Indeterminate: an animating bar meaning "working, duration unknown".
+    // setRange(0, 0) is what Qt reads as indeterminate, and a bar left in that
+    // range shows no fraction however many times setValue() is called.
+    void setBusy(bool busy);
+
+    // Determinate: a real fraction. Passing a total of 0 or less would be a
+    // silent request for the indeterminate range, so it is treated as busy
+    // instead of quietly drawing an empty bar forever.
+    void setProgress(int value, int total);
+
+    bool isBusy() const;
+    bool isDeterminate() const;
+};