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diff --git a/fiv-view.h b/fiv-view.h
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+//
+// fiv-view.h: fast image viewer - view widget
+//
+// Copyright (c) 2021, Přemysl Eric Janouch <p@janouch.name>
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
+
+#pragma once
+
+#include <gtk/gtk.h>
+
+#define FIV_TYPE_VIEW (fiv_view_get_type())
+G_DECLARE_FINAL_TYPE(FivView, fiv_view, FIV, VIEW, GtkWidget)
+
+/// Try to open the given file, synchronously, to be displayed by the widget.
+gboolean fiv_view_open(FivView *self, const gchar *path, GError **error);
+
+typedef enum _FivViewCommand {
+	FIV_VIEW_COMMAND_ROTATE_LEFT = 1,
+	FIV_VIEW_COMMAND_MIRROR,
+	FIV_VIEW_COMMAND_ROTATE_RIGHT,
+
+	FIV_VIEW_COMMAND_PAGE_FIRST,
+	FIV_VIEW_COMMAND_PAGE_PREVIOUS,
+	FIV_VIEW_COMMAND_PAGE_NEXT,
+	FIV_VIEW_COMMAND_PAGE_LAST,
+
+	FIV_VIEW_COMMAND_FRAME_FIRST,
+	FIV_VIEW_COMMAND_FRAME_PREVIOUS,
+	FIV_VIEW_COMMAND_FRAME_NEXT,
+	// Going to the end frame makes no sense, wrap around if needed.
+
+	FIV_VIEW_COMMAND_PRINT,
+	FIV_VIEW_COMMAND_SAVE_PAGE,
+
+	FIV_VIEW_COMMAND_ZOOM_IN,
+	FIV_VIEW_COMMAND_ZOOM_OUT,
+	FIV_VIEW_COMMAND_ZOOM_1
+} FivViewCommand;
+
+/// Execute a user action.
+void fiv_view_command(FivView *self, FivViewCommand command);