Factor out AbstractDialogImpl template for reuse

Add a ctor to /opt/lo/bin/clang-format -i include/vcl/abstdlgimpl.hxx
to construct the dialog in-place, to simplify factory methods.
And move two abstract dialog impls where all others are in cui

Change-Id: Ia3f3a5d6c1aaa5a9aca9c11990f833842e4536e2
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/178983
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Jenkins

1 files changed, 84 insertions, 0 deletions

diff --git a/include/vcl/abstdlgimpl.hxx b/include/vcl/abstdlgimpl.hxx
new file mode 100644
index 000000000000..6e3d9150b752
--- /dev/null
+++ b/include/vcl/abstdlgimpl.hxx
@@ -0,0 +1,84 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <vcl/abstdlg.hxx>
+#include <vcl/weld.hxx>
+
+#include <memory>
+#include <type_traits>
+
+namespace vcl
+{
+// Templated base class storing the dialog pointer, and implementing Execute, StartExecuteAsync,
+// and the shared constructor used by derived classes
+template <class Base, class Dialog, template <class...> class Ptr, bool Async>
+requires std::is_base_of_v<VclAbstractDialog, Base>&&
+    std::is_base_of_v<weld::DialogController, Dialog> class AbstractDialogImpl_BASE : public Base
+{
+public:
+    explicit AbstractDialogImpl_BASE(Ptr<Dialog> p)
+        : m_pDlg(std::move(p))
+    {
+    }
+    template <typename... Arg>
+    requires std::is_constructible_v<Dialog, Arg...> explicit AbstractDialogImpl_BASE(Arg&&... arg)
+        : m_pDlg(make_dialog(std::forward<Arg>(arg)...))
+    {
+    }
+
+    short Execute() override { return m_pDlg->run(); }
+
+    bool StartExecuteAsync(VclAbstractDialog::AsyncContext& rCtx) override
+    {
+        if constexpr (Async)
+            return Dialog::runAsync(m_pDlg, rCtx.maEndDialogFn);
+        else
+            return Base::StartExecuteAsync(rCtx); // assert / fail
+    }
+
+protected:
+    Ptr<Dialog> m_pDlg;
+
+private:
+    template <typename... Arg> static auto make_dialog(Arg&&... arg)
+    {
+        if constexpr (std::is_same_v<Ptr<void>, std::shared_ptr<void>>)
+            return std::make_shared<Dialog>(std::forward<Arg>(arg)...);
+        else
+            return std::make_unique<Dialog>(std::forward<Arg>(arg)...);
+    }
+};
+
+// Base for synchronously called dialogs, using unique_ptr
+template <class Base, class Dialog>
+using AbstractDialogImpl_Sync = AbstractDialogImpl_BASE<Base, Dialog, std::unique_ptr, false>;
+
+// Base for synchronously called dialogs, using shared_ptr
+template <class Base, class Dialog>
+using AbstractDialogImpl_Sync_Shared
+    = AbstractDialogImpl_BASE<Base, Dialog, std::shared_ptr, false>;
+
+// Base for asynchronously called dialogs
+template <class Base, class Dialog>
+using AbstractDialogImpl_Async = AbstractDialogImpl_BASE<Base, Dialog, std::shared_ptr, true>;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */