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diff --git a/vcl/source/control/PriorityMergedHBox.cxx b/vcl/source/control/PriorityMergedHBox.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+* 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 .
+*/
+
+#include <vcl/toolkit/button.hxx>
+#include <vcl/layout.hxx>
+#include <bitmaps.hlst>
+#include <NotebookbarPopup.hxx>
+#include <PriorityHBox.hxx>
+#include <PriorityMergedHBox.hxx>
+#include <comphelper/lok.hxx>
+
+#define DUMMY_WIDTH 50
+#define BUTTON_WIDTH 30
+
+/*
+* PriorityMergedHBox is a VclHBox which hides its own children if there is no sufficient space.
+*/
+
+PriorityMergedHBox::PriorityMergedHBox(vcl::Window* pParent)
+ : PriorityHBox(pParent)
+{
+ m_pButton = VclPtr<PushButton>::Create(this, WB_FLATBUTTON);
+ m_pButton->SetClickHdl(LINK(this, PriorityMergedHBox, PBClickHdl));
+ m_pButton->SetModeImage(Image(StockImage::Yes, CHEVRON));
+ m_pButton->set_width_request(25);
+ m_pButton->set_pack_type(VclPackType::End);
+ m_pButton->Show();
+}
+
+void PriorityMergedHBox::Resize()
+{
+ if (comphelper::LibreOfficeKit::isActive())
+ return VclHBox::Resize();
+
+ if (!m_bInitialized)
+ Initialize();
+
+ if (!m_bInitialized)
+ {
+ return VclHBox::Resize();
+ }
+
+ tools::Long nWidth = GetSizePixel().Width();
+ tools::Long nCurrentWidth = VclHBox::calculateRequisition().getWidth() + BUTTON_WIDTH;
+
+ // Hide lower priority controls
+ for (int i = GetChildCount() - 1; i >= 0; i--)
+ {
+ vcl::Window* pWindow = GetChild(i);
+
+ if (nCurrentWidth <= nWidth)
+ break;
+
+ if (pWindow && pWindow->GetParent() == this && pWindow->IsVisible())
+ {
+ if (pWindow->GetOutputSizePixel().Width())
+ nCurrentWidth -= pWindow->GetOutputSizePixel().Width();
+ else
+ nCurrentWidth -= DUMMY_WIDTH;
+ pWindow->Hide();
+ }
+ }
+
+ // Show higher priority controls if we already have enough space
+ for (int i = 0; i < GetChildCount(); i++)
+ {
+ vcl::Window* pWindow = GetChild(i);
+
+ if (pWindow->GetParent() != this)
+ {
+ continue;
+ }
+
+ if (pWindow && !pWindow->IsVisible())
+ {
+ pWindow->Show();
+ nCurrentWidth += getLayoutRequisition(*pWindow).Width() + get_spacing();
+
+ if (nCurrentWidth > nWidth)
+ {
+ pWindow->Hide();
+ break;
+ }
+ }
+ }
+
+ VclHBox::Resize();
+
+ if (GetHiddenCount())
+ m_pButton->Show();
+ else
+ m_pButton->Hide();
+}
+
+void PriorityMergedHBox::dispose()
+{
+ m_pButton.disposeAndClear();
+ if (m_pPopup)
+ m_pPopup.disposeAndClear();
+ PriorityHBox::dispose();
+}
+
+int PriorityMergedHBox::GetHiddenCount() const
+{
+ int nCount = 0;
+
+ for (int i = GetChildCount() - 1; i >= 0; i--)
+ {
+ vcl::Window* pWindow = GetChild(i);
+ if (pWindow && pWindow->GetParent() == this && !pWindow->IsVisible())
+ nCount++;
+ }
+
+ return nCount;
+}
+
+Size PriorityMergedHBox::calculateRequisition() const
+{
+ if (!m_bInitialized)
+ {
+ return VclHBox::calculateRequisition();
+ }
+
+ sal_uInt16 nVisibleChildren = 0;
+
+ Size aSize;
+ for (vcl::Window* pChild = GetWindow(GetWindowType::FirstChild); pChild;
+ pChild = pChild->GetWindow(GetWindowType::Next))
+ {
+ if (!pChild->IsVisible())
+ continue;
+ ++nVisibleChildren;
+ Size aChildSize = getLayoutRequisition(*pChild);
+
+ tools::Long nPrimaryDimension = getPrimaryDimension(aChildSize);
+ nPrimaryDimension += pChild->get_padding() * 2;
+ setPrimaryDimension(aChildSize, nPrimaryDimension);
+
+ accumulateMaxes(aChildSize, aSize);
+ }
+
+ // find max height
+ for (vcl::Window* pChild = GetWindow(GetWindowType::FirstChild); pChild;
+ pChild = pChild->GetWindow(GetWindowType::Next))
+ {
+ Size aChildSize = getLayoutRequisition(*pChild);
+ setPrimaryDimension(aChildSize, getPrimaryDimension(aSize));
+ accumulateMaxes(aChildSize, aSize);
+ }
+
+ setPrimaryDimension(aSize, 200);
+ return finalizeMaxes(aSize, nVisibleChildren);
+}
+
+IMPL_LINK(PriorityMergedHBox, PBClickHdl, Button*, /*pButton*/, void)
+{
+ if (m_pPopup)
+ m_pPopup.disposeAndClear();
+
+ m_pPopup = VclPtr<NotebookbarPopup>::Create(this);
+
+ for (int i = 0; i < GetChildCount(); i++)
+ {
+ vcl::Window* pWindow = GetChild(i);
+ if (pWindow != m_pButton)
+ {
+ if (!pWindow->IsVisible())
+ {
+ pWindow->Show();
+ pWindow->SetParent(m_pPopup->getBox());
+ // count is decreased because we moved child
+ i--;
+ }
+ }
+ }
+
+ m_pPopup->hideSeparators(true);
+
+ tools::Long x = m_pButton->GetPosPixel().getX();
+ tools::Long y = m_pButton->GetPosPixel().getY() + GetSizePixel().Height();
+ tools::Rectangle aRect(x, y, x, y);
+
+ m_pPopup->StartPopupMode(aRect, FloatWinPopupFlags::Down | FloatWinPopupFlags::GrabFocus
+ | FloatWinPopupFlags::AllMouseButtonClose);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */