1 files changed, 197 insertions, 0 deletions
diff --git a/vcl/source/control/PriorityHBox.cxx b/vcl/source/control/PriorityHBox.cxx
new file mode 100644
index 000000000..c893cc833
--- /dev/null
+++ b/vcl/source/control/PriorityHBox.cxx
@@ -0,0 +1,197 @@
+/* -*- 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/layout.hxx>
+#include <PriorityHBox.hxx>
+#include <comphelper/lok.hxx>
+
+namespace
+{
+bool lcl_comparePriority(const vcl::IPrioritable* a, const vcl::IPrioritable* b)
+{
+    return a->GetPriority() < b->GetPriority();
+}
+}
+
+PriorityHBox::PriorityHBox(vcl::Window* pParent)
+    : VclHBox(pParent)
+    , m_bInitialized(false)
+{
+}
+
+PriorityHBox::~PriorityHBox() { disposeOnce(); }
+
+void PriorityHBox::Initialize()
+{
+    m_bInitialized = true;
+
+    GetChildrenWithPriorities();
+    SetSizeFromParent();
+}
+
+int PriorityHBox::GetHiddenCount() const
+{
+    int nCount = 0;
+
+    for (auto pWindow : m_aSortedChildren)
+        if (pWindow->IsHidden())
+            nCount++;
+
+    return nCount;
+}
+
+void PriorityHBox::SetSizeFromParent()
+{
+    vcl::Window* pParent = GetParent();
+    if (pParent)
+    {
+        Size aParentSize = pParent->GetSizePixel();
+        SetSizePixel(Size(aParentSize.getWidth(), aParentSize.getHeight()));
+    }
+}
+
+Size PriorityHBox::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);
+
+        bool bAlwaysExpanded = true;
+
+        vcl::IPrioritable* pPrioritable = dynamic_cast<vcl::IPrioritable*>(pChild);
+        if (pPrioritable && pPrioritable->GetPriority() != VCL_PRIORITY_DEFAULT)
+            bAlwaysExpanded = false;
+
+        if (bAlwaysExpanded)
+        {
+            tools::Long nPrimaryDimension = getPrimaryDimension(aChildSize);
+            nPrimaryDimension += pChild->get_padding() * 2;
+            setPrimaryDimension(aChildSize, nPrimaryDimension);
+        }
+        else
+            setPrimaryDimension(aChildSize, 0);
+
+        accumulateMaxes(aChildSize, aSize);
+    }
+
+    return finalizeMaxes(aSize, nVisibleChildren);
+}
+
+void PriorityHBox::Resize()
+{
+    if (!m_bInitialized)
+        Initialize();
+
+    if (!m_bInitialized || comphelper::LibreOfficeKit::isActive())
+    {
+        return VclHBox::Resize();
+    }
+
+    tools::Long nWidth = GetSizePixel().Width();
+    tools::Long nCurrentWidth = VclHBox::calculateRequisition().getWidth();
+
+    // Hide lower priority controls
+    for (vcl::IPrioritable* pPrioritable : m_aSortedChildren)
+    {
+        if (nCurrentWidth <= nWidth)
+            break;
+
+        vcl::Window* pWindow = dynamic_cast<vcl::Window*>(pPrioritable);
+
+        if (pWindow && pWindow->GetParent() == this)
+        {
+            nCurrentWidth -= pWindow->GetOutputSizePixel().Width() + get_spacing();
+            pWindow->Show();
+            pPrioritable->HideContent();
+            nCurrentWidth += pWindow->GetOutputSizePixel().Width() + get_spacing();
+        }
+    }
+
+    auto pChildR = m_aSortedChildren.rbegin();
+    // Show higher priority controls if we already have enough space
+    while (pChildR != m_aSortedChildren.rend())
+    {
+        vcl::Window* pWindow = dynamic_cast<vcl::Window*>(*pChildR);
+        vcl::IPrioritable* pPrioritable = *pChildR;
+
+        if (pWindow->GetParent() != this)
+        {
+            pChildR++;
+            continue;
+        }
+
+        if (pWindow)
+        {
+            nCurrentWidth -= pWindow->GetOutputSizePixel().Width() + get_spacing();
+            pWindow->Show();
+            pPrioritable->ShowContent();
+            nCurrentWidth += getLayoutRequisition(*pWindow).Width() + get_spacing();
+
+            if (nCurrentWidth > nWidth)
+            {
+                pPrioritable->HideContent();
+                break;
+            }
+        }
+
+        pChildR++;
+    }
+
+    VclHBox::Resize();
+}
+
+void PriorityHBox::Paint(vcl::RenderContext& rRenderContext, const tools::Rectangle& rRect)
+{
+    if (!m_bInitialized)
+        Initialize();
+
+    VclHBox::Paint(rRenderContext, rRect);
+}
+
+void PriorityHBox::GetChildrenWithPriorities()
+{
+    for (sal_uInt16 i = 0; i < GetChildCount(); ++i)
+    {
+        vcl::Window* pChild = GetChild(i);
+
+        // Add only containers which have explicitly assigned priority.
+        vcl::IPrioritable* pPrioritable = dynamic_cast<vcl::IPrioritable*>(pChild);
+        if (pPrioritable && pPrioritable->GetPriority() != VCL_PRIORITY_DEFAULT)
+            m_aSortedChildren.push_back(pPrioritable);
+    }
+
+    if (m_aSortedChildren.empty())
+        m_bInitialized = false;
+
+    std::sort(m_aSortedChildren.begin(), m_aSortedChildren.end(), lcl_comparePriority);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */