GSoC notebookbar: container with priority

+ extended vcl builder to parse priority
+ IPrioritable interface for controls with priorities
+ added IPrioritable as a base for VclContainer
+ Added PriorityHBox - box which shows controls if we have enough space
PriorityHBox listen vcl events from SystemWindow to detect Resize

Change-Id: I74ac1a80e7d0a061f5e7a8584dbb2abf956053c7
Reviewed-on: https://gerrit.libreoffice.org/26983
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>

10 files changed, 649 insertions, 317 deletions

diff --git a/extras/source/glade/libreoffice-catalog.xml.in b/extras/source/glade/libreoffice-catalog.xml.in
index a822164e04bc..b92d24be5670 100644
--- a/extras/source/glade/libreoffice-catalog.xml.in
+++ b/extras/source/glade/libreoffice-catalog.xml.in
@@ -827,5 +827,8 @@
     <glade-widget-class title="Button with small padding" name="vcllo-SmallButton"
                         generic-name="SmallButton" parent="GtkButton"
                         icon-name="widget-gtk-button"/>
+    <glade-widget-class title="Horizontal box hiding childs depending on its priorities" name="sfxlo-PriorityHBox"
+                        generic-name="PriorityHBox" parent="GtkBox"
+                        icon-name="widget-gtk-box"/>
   </glade-widget-classes>
 </glade-catalog>
diff --git a/include/vcl/IPrioritable.hxx b/include/vcl/IPrioritable.hxx
new file mode 100644
index 000000000000..11146681ee65
--- /dev/null
+++ b/include/vcl/IPrioritable.hxx
@@ -0,0 +1,44 @@
+/* -*- 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/.
+ */
+
+#ifndef INCLUDED_VCL_IPRIORITABLE_HXX
+#define INCLUDED_VCL_IPRIORITABLE_HXX
+
+#define VCL_PRIORITY_DEFAULT -1
+
+namespace vcl
+{
+
+class VCL_DLLPUBLIC IPrioritable
+{
+protected:
+    IPrioritable() : m_nPriority(VCL_PRIORITY_DEFAULT)
+    {
+    }
+
+public:
+    int GetPriority() const
+    {
+        return m_nPriority;
+    }
+
+    void SetPriority(int nPriority)
+    {
+        m_nPriority = nPriority;
+    }
+
+private:
+    int m_nPriority;
+};
+
+} // namespace vcl
+
+#endif // INCLUDED_VCL_IPRIORITABLE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/include/vcl/builder.hxx b/include/vcl/builder.hxx
index 13ff4200cb98..787f6ea30b81 100644
--- a/include/vcl/builder.hxx
+++ b/include/vcl/builder.hxx
@@ -351,8 +351,8 @@ private:
     void        handleChild(vcl::Window *pParent, xmlreader::XmlReader &reader);
     VclPtr<vcl::Window> handleObject(vcl::Window *pParent, xmlreader::XmlReader &reader);
     void        handlePacking(vcl::Window *pCurrent, vcl::Window *pParent, xmlreader::XmlReader &reader);
-    static std::vector<vcl::EnumContext::Context> handleStyle(xmlreader::XmlReader &reader);
-    static vcl::EnumContext::Context getContext(xmlreader::XmlReader &reader);
+    static std::vector<vcl::EnumContext::Context> handleStyle(xmlreader::XmlReader &reader, int &nPriority);
+    static OString getStyleClass(xmlreader::XmlReader &reader);
     void        applyPackingProperty(vcl::Window *pCurrent, vcl::Window *pParent, xmlreader::XmlReader &reader);
     void        collectProperty(xmlreader::XmlReader &reader, const OString &rID, stringmap &rVec);
     static void collectPangoAttribute(xmlreader::XmlReader &reader, stringmap &rMap);
diff --git a/include/vcl/layout.hxx b/include/vcl/layout.hxx
index a3e21042989c..59d7d6c6ae45 100644
--- a/include/vcl/layout.hxx
+++ b/include/vcl/layout.hxx
@@ -14,13 +14,15 @@
 #include <vcl/button.hxx>
 #include <vcl/dialog.hxx>
 #include <vcl/fixed.hxx>
+#include <vcl/IPrioritable.hxx>
 #include <vcl/scrbar.hxx>
 #include <vcl/vclmedit.hxx>
 #include <vcl/window.hxx>
 #include <vcl/vclptr.hxx>
 #include <set>
 
-class VCL_DLLPUBLIC VclContainer : public vcl::Window
+class VCL_DLLPUBLIC VclContainer : public vcl::Window,
+                                   public vcl::IPrioritable
 {
 public:
     VclContainer(vcl::Window *pParent, WinBits nStyle = WB_HIDE | WB_CLIPCHILDREN);
diff --git a/sfx2/Library_sfx.mk b/sfx2/Library_sfx.mk
index 0b77f45d62b7..fddb89b8af75 100644
--- a/sfx2/Library_sfx.mk
+++ b/sfx2/Library_sfx.mk
@@ -234,6 +234,7 @@ $(eval $(call gb_Library_add_exception_objects,sfx,\
     sfx2/source/doc/saveastemplatedlg \
     sfx2/source/explorer/nochaos \
     sfx2/source/inet/inettbc \
+    sfx2/source/notebookbar/PriorityHBox \
     sfx2/source/notebookbar/SfxNotebookBar \
     sfx2/source/notify/eventsupplier \
     sfx2/source/notify/globalevents \
diff --git a/sfx2/source/doc/objxtor.cxx b/sfx2/source/doc/objxtor.cxx
index 8f7a814bdce6..f3cc4f2d716a 100644
--- a/sfx2/source/doc/objxtor.cxx
+++ b/sfx2/source/doc/objxtor.cxx
@@ -97,6 +97,7 @@
 #include "appbaslib.hxx"
 #include <sfx2/sfxbasemodel.hxx>
 #include <shellimpl.hxx>
+#include <sfx2/notebookbar/SfxNotebookBar.hxx>
 
 #include <basic/basicmanagerrepository.hxx>
 
@@ -622,6 +623,8 @@ bool SfxObjectShell::PrepareClose
             return false;
     }
 
+    if ( pFrame )
+        sfx2::SfxNotebookBar::CloseMethod(pFrame->GetBindings());
     pImpl->bPreparedForClose = true;
     return true;
 }
diff --git a/sfx2/source/notebookbar/PriorityHBox.cxx b/sfx2/source/notebookbar/PriorityHBox.cxx
new file mode 100644
index 000000000000..88f91bc90518
--- /dev/null
+++ b/sfx2/source/notebookbar/PriorityHBox.cxx
@@ -0,0 +1,152 @@
+/* -*- 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/builderfactory.hxx>
+#include <vcl/layout.hxx>
+#include <sfx2/dllapi.h>
+#include <sfx2/viewfrm.hxx>
+
+#include <vector>
+
+bool lcl_comparePriority(const vcl::IPrioritable* a, const vcl::IPrioritable* b)
+{
+    return a->GetPriority() < b->GetPriority();
+}
+
+/*
+ * PriorityHBox is a VclHBox which hides own childs if there is no sufficient space.
+ * Hiding order can be modified using child's priorities. If a control have default
+ * priority assigned (VCL_PRIORITY_DEFAULT), it is always shown.
+ */
+
+class SFX2_DLLPUBLIC PriorityHBox : public VclHBox
+{
+private:
+    bool m_bInitialized;
+    long m_nNeededWidth;
+
+    std::vector<IPrioritable*> m_aSortedChilds;
+
+public:
+    PriorityHBox(vcl::Window *pParent)
+        : VclHBox(pParent)
+        , m_bInitialized(false)
+        , m_nNeededWidth(0)
+    {
+    }
+
+    virtual ~PriorityHBox() override
+    {
+        disposeOnce();
+    }
+
+    virtual void dispose() override
+    {
+        if (m_bInitialized && SfxViewFrame::Current())
+        {
+            SystemWindow* pSystemWindow = SfxViewFrame::Current()->GetFrame().GetSystemWindow();
+            pSystemWindow->RemoveEventListener(LINK(this, PriorityHBox, WindowEventListener));
+        }
+        VclHBox::dispose();
+    }
+
+    virtual void Resize() override
+    {
+        long nWidth = GetSizePixel().Width();
+        long nCurrentWidth = m_nNeededWidth;
+
+        // Hide lower priority controls
+        auto pChild = m_aSortedChilds.begin();
+        while (nCurrentWidth > nWidth && pChild != m_aSortedChilds.end())
+        {
+            VclContainer* pContainer = static_cast<VclContainer*>(*pChild);
+            nCurrentWidth -= pContainer->GetSizePixel().Width() + get_spacing();
+            pContainer->Hide();
+            pChild++;
+        }
+
+        // Show higher priority controls if we already have enough space
+        while (pChild != m_aSortedChilds.end())
+        {
+            static_cast<VclContainer*>(*pChild)->Show();
+            pChild++;
+        }
+
+        VclHBox::Resize();
+    }
+
+    virtual void Paint(vcl::RenderContext& rRenderContext, const Rectangle& rRect) override
+    {
+        if (!m_bInitialized)
+        {
+            m_bInitialized = true;
+
+            SystemWindow* pSystemWindow = SfxViewFrame::Current()->GetFrame().GetSystemWindow();
+            pSystemWindow->AddEventListener(LINK(this, PriorityHBox, WindowEventListener));
+
+            CalcNeededWidth();
+
+            long nWidth = pSystemWindow->GetSizePixel().Width();
+            SetSizePixel(Size(nWidth, GetSizePixel().Height()));
+        }
+
+        VclHBox::Paint(rRenderContext, rRect);
+    }
+
+    void CalcNeededWidth()
+    {
+        int spacing = get_spacing();
+
+        for (sal_uInt16 i = 0; i < GetChildCount(); ++i)
+        {
+            vcl::Window* pChild = GetChild(i);
+            m_nNeededWidth += pChild->GetSizePixel().Width() + spacing;
+
+            // Add only containers which have explicitly assigned priority.
+            if (pChild->GetType() == WINDOW_CONTAINER)
+            {
+                IPrioritable* pPrioritable = dynamic_cast<IPrioritable*>(pChild);
+                if (pPrioritable->GetPriority() != VCL_PRIORITY_DEFAULT)
+                    m_aSortedChilds.push_back(pPrioritable);
+            }
+        }
+
+        std::sort(m_aSortedChilds.begin(), m_aSortedChilds.end(), lcl_comparePriority);
+    }
+
+private:
+    DECL_LINK_TYPED( WindowEventListener, VclWindowEvent&, void );
+};
+
+IMPL_LINK_TYPED( PriorityHBox, WindowEventListener, VclWindowEvent&, rEvent, void )
+{
+    if (rEvent.GetId() == VCLEVENT_WINDOW_RESIZE)
+    {
+        vcl::Window* pEventWindow = rEvent.GetWindow();
+
+        OSL_ENSURE(pEventWindow, "PriorityHBox::WindowEventListener: no window!");
+
+        long nWidth = pEventWindow->GetSizePixel().Width();
+        SetSizePixel(Size(nWidth, GetSizePixel().Height()));
+    }
+}
+
+VCL_BUILDER_FACTORY(PriorityHBox)
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sw/uiconfig/swriter/ui/notebookbar.ui b/sw/uiconfig/swriter/ui/notebookbar.ui
index 8df7c6426143..00949e278f24 100644
--- a/sw/uiconfig/swriter/ui/notebookbar.ui
+++ b/sw/uiconfig/swriter/ui/notebookbar.ui
@@ -254,7 +254,7 @@
               </packing>
             </child>
             <child>
-              <object class="GtkBox" id="box3">
+              <object class="sfxlo-PriorityHBox" id="box3">
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
                 <property name="spacing">6</property>
@@ -323,6 +323,17 @@
                         <property name="position">1</property>
                       </packing>
                     </child>
+                  </object>
+                  <packing>
+                    <property name="expand">False</property>
+                    <property name="fill">True</property>
+                    <property name="position">0</property>
+                  </packing>
+                </child>
+                <child>
+                  <object class="GtkBox" id="box18">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
                     <child>
                       <object class="vcllo-SmallButton" id="FormatPaintbrush">
                         <property name="visible">True</property>
@@ -337,14 +348,17 @@
                       <packing>
                         <property name="expand">False</property>
                         <property name="fill">True</property>
-                        <property name="position">2</property>
+                        <property name="position">0</property>
                       </packing>
                     </child>
+                    <style>
+                      <class name="priority-2"/>
+                    </style>
                   </object>
                   <packing>
                     <property name="expand">False</property>
                     <property name="fill">True</property>
-                    <property name="position">0</property>
+                    <property name="position">1</property>
                   </packing>
                 </child>
                 <child>
@@ -356,7 +370,7 @@
                   <packing>
                     <property name="expand">False</property>
                     <property name="fill">True</property>
-                    <property name="position">1</property>
+                    <property name="position">2</property>
                   </packing>
                 </child>
                 <child>
@@ -415,72 +429,6 @@
                             <property name="position">1</property>
                           </packing>
                         </child>
-                        <child>
-                          <object class="sfxlo-SidebarToolBox" id="fontadjust">
-                            <property name="visible">True</property>
-                            <property name="can_focus">False</property>
-                            <property name="show_arrow">False</property>
-                            <child>
-                              <object class="GtkToolButton" id="grow">
-                                <property name="use_action_appearance">False</property>
-                                <property name="visible">True</property>
-                                <property name="can_focus">False</property>
-                                <property name="is_important">True</property>
-                                <property name="action_name">.uno:Grow</property>
-                                <property name="use_underline">True</property>
-                              </object>
-                              <packing>
-                                <property name="expand">False</property>
-                                <property name="homogeneous">True</property>
-                              </packing>
-                            </child>
-                            <child>
-                              <object class="GtkToolButton" id="shrink">
-                                <property name="use_action_appearance">False</property>
-                                <property name="visible">True</property>
-                                <property name="can_focus">False</property>
-                                <property name="is_important">True</property>
-                                <property name="action_name">.uno:Shrink</property>
-                                <property name="use_underline">True</property>
-                              </object>
-                              <packing>
-                                <property name="expand">False</property>
-                                <property name="homogeneous">True</property>
-                              </packing>
-                            </child>
-                          </object>
-                          <packing>
-                            <property name="expand">False</property>
-                            <property name="fill">True</property>
-                            <property name="position">2</property>
-                          </packing>
-                        </child>
-                        <child>
-                          <object class="sfxlo-SidebarToolBox" id="reset">
-                            <property name="visible">True</property>
-                            <property name="can_focus">False</property>
-                            <property name="show_arrow">False</property>
-                            <child>
-                              <object class="GtkToolButton" id="ResetAttributes">
-                                <property name="use_action_appearance">False</property>
-                                <property name="visible">True</property>
-                                <property name="can_focus">False</property>
-                                <property name="is_important">True</property>
-                                <property name="action_name">.uno:ResetAttributes</property>
-                                <property name="use_underline">True</property>
-                              </object>
-                              <packing>
-                                <property name="expand">False</property>
-                                <property name="homogeneous">True</property>
-                              </packing>
-                            </child>
-                          </object>
-                          <packing>
-                            <property name="expand">False</property>
-                            <property name="fill">True</property>
-                            <property name="position">3</property>
-                          </packing>
-                        </child>
                       </object>
                       <packing>
                         <property name="expand">False</property>
@@ -576,73 +524,6 @@
                           </packing>
                         </child>
                         <child>
-                          <object class="sfxlo-SidebarToolBox" id="position">
-                            <property name="visible">True</property>
-                            <property name="can_focus">False</property>
-                            <property name="show_arrow">False</property>
-                            <child>
-                              <object class="GtkToolButton" id="subscript">
-                                <property name="use_action_appearance">False</property>
-                                <property name="visible">True</property>
-                                <property name="can_focus">False</property>
-                                <property name="is_important">True</property>
-                                <property name="action_name">.uno:SubScript</property>
-                                <property name="use_underline">True</property>
-                              </object>
-                              <packing>
-                                <property name="expand">False</property>
-                                <property name="homogeneous">True</property>
-                              </packing>
-                            </child>
-                            <child>
-                              <object class="GtkToolButton" id="superscript">
-                                <property name="use_action_appearance">False</property>
-                                <property name="visible">True</property>
-                                <property name="can_focus">False</property>
-                                <property name="is_important">True</property>
-                                <property name="action_name">.uno:SuperScript</property>
-                                <property name="use_underline">True</property>
-                              </object>
-                              <packing>
-                                <property name="expand">False</property>
-                                <property name="homogeneous">True</property>
-                              </packing>
-                            </child>
-                          </object>
-                          <packing>
-                            <property name="expand">False</property>
-                            <property name="fill">True</property>
-                            <property name="pack_type">end</property>
-                            <property name="position">1</property>
-                          </packing>
-                        </child>
-                        <child>
-                          <object class="sfxlo-SidebarToolBox" id="spacingbar">
-                            <property name="visible">True</property>
-                            <property name="can_focus">False</property>
-                            <child>
-                              <object class="GtkMenuToolButton" id="spacing">
-                                <property name="use_action_appearance">False</property>
-                                <property name="visible">True</property>
-                                <property name="can_focus">False</property>
-                                <property name="is_important">True</property>
-                                <property name="action_name">.uno:Spacing</property>
-                                <property name="use_underline">True</property>
-                              </object>
-                              <packing>
-                                <property name="expand">False</property>
-                                <property name="homogeneous">True</property>
-                              </packing>
-                            </child>
-                          </object>
-                          <packing>
-                            <property name="expand">False</property>
-                            <property name="fill">True</property>
-                            <property name="pack_type">end</property>
-                            <property name="position">2</property>
-                          </packing>
-                        </child>
-                        <child>
                           <object class="sfxlo-SidebarToolBox" id="colorbar_writer">
                             <property name="visible">True</property>
                             <property name="can_focus">False</property>
@@ -705,7 +586,168 @@
                   <packing>
                     <property name="expand">False</property>
                     <property name="fill">True</property>
-                    <property name="position">2</property>
+                    <property name="position">3</property>
+                  </packing>
+                </child>
+                <child>
+                  <object class="GtkBox" id="box27">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="orientation">vertical</property>
+                    <child>
+                      <object class="sfxlo-SidebarToolBox" id="fontadjust">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="show_arrow">False</property>
+                        <child>
+                          <object class="GtkToolButton" id="grow1">
+                            <property name="use_action_appearance">False</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">False</property>
+                            <property name="is_important">True</property>
+                            <property name="action_name">.uno:Grow</property>
+                            <property name="use_underline">True</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="homogeneous">True</property>
+                          </packing>
+                        </child>
+                        <child>
+                          <object class="GtkToolButton" id="shrink1">
+                            <property name="use_action_appearance">False</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">False</property>
+                            <property name="is_important">True</property>
+                            <property name="action_name">.uno:Shrink</property>
+                            <property name="use_underline">True</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="homogeneous">True</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="expand">False</property>
+                        <property name="fill">True</property>
+                        <property name="position">0</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="sfxlo-SidebarToolBox" id="position1">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="show_arrow">False</property>
+                        <child>
+                          <object class="GtkToolButton" id="subscript2">
+                            <property name="use_action_appearance">False</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">False</property>
+                            <property name="is_important">True</property>
+                            <property name="action_name">.uno:SubScript</property>
+                            <property name="use_underline">True</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="homogeneous">True</property>
+                          </packing>
+                        </child>
+                        <child>
+                          <object class="GtkToolButton" id="superscript2">
+                            <property name="use_action_appearance">False</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">False</property>
+                            <property name="is_important">True</property>
+                            <property name="action_name">.uno:SuperScript</property>
+                            <property name="use_underline">True</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="homogeneous">True</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="expand">False</property>
+                        <property name="fill">True</property>
+                        <property name="position">1</property>
+                      </packing>
+                    </child>
+                    <style>
+                      <class name="priority-4"/>
+                    </style>
+                  </object>
+                  <packing>
+                    <property name="expand">False</property>
+                    <property name="fill">True</property>
+                    <property name="position">4</property>
+                  </packing>
+                </child>
+                <child>
+                  <object class="GtkBox" id="box67">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="orientation">vertical</property>
+                    <child>
+                      <object class="sfxlo-SidebarToolBox" id="reset1">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="show_arrow">False</property>
+                        <child>
+                          <object class="GtkToolButton" id="ResetAttributes2">
+                            <property name="use_action_appearance">False</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">False</property>
+                            <property name="is_important">True</property>
+                            <property name="action_name">.uno:ResetAttributes</property>
+                            <property name="use_underline">True</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="homogeneous">True</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="expand">False</property>
+                        <property name="fill">True</property>
+                        <property name="position">0</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="sfxlo-SidebarToolBox" id="spacingbar">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <child>
+                          <object class="GtkMenuToolButton" id="spacing1">
+                            <property name="use_action_appearance">False</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">False</property>
+                            <property name="is_important">True</property>
+                            <property name="action_name">.uno:Spacing</property>
+                            <property name="use_underline">True</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="homogeneous">True</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="expand">False</property>
+                        <property name="fill">True</property>
+                        <property name="position">1</property>
+                      </packing>
+                    </child>
+                    <style>
+                      <class name="priority-3"/>
+                    </style>
+                  </object>
+                  <packing>
+                    <property name="expand">False</property>
+                    <property name="fill">True</property>
+                    <property name="position">5</property>
                   </packing>
                 </child>
                 <child>
@@ -717,7 +759,7 @@
                   <packing>
                     <property name="expand">False</property>
                     <property name="fill">True</property>
-                    <property name="position">3</property>
+                    <property name="position">6</property>
                   </packing>
                 </child>
                 <child>
@@ -798,90 +840,6 @@
                             <property name="position">0</property>
                           </packing>
                         </child>
-                        <child>
-                          <object class="sfxlo-SidebarToolBox" id="indent">
-                            <property name="visible">True</property>
-                            <property name="can_focus">False</property>
-                            <property name="has_tooltip">True</property>
-                            <property name="tooltip_text" translatable="yes">Indent</property>
-                            <child>
-                              <object class="GtkToolButton" id="increaseindent">
-                                <property name="use_action_appearance">False</property>
-                                <property name="visible">True</property>
-                                <property name="can_focus">False</property>
-                                <property name="has_tooltip">True</property>
-                                <property name="tooltip_text" translatable="yes">Increase Indent</property>
-                                <property name="is_important">True</property>
-                                <property name="action_name">.uno:IncrementIndent</property>
-                                <property name="use_underline">True</property>
-                              </object>
-                              <packing>
-                                <property name="expand">False</property>
-                                <property name="homogeneous">True</property>
-                              </packing>
-                            </child>
-                            <child>
-                              <object class="GtkToolButton" id="decreaseindent">
-                                <property name="use_action_appearance">False</property>
-                                <property name="visible">True</property>
-                                <property name="can_focus">False</property>
-                                <property name="has_tooltip">True</property>
-                                <property name="tooltip_text" translatable="yes">Decrease Indent</property>
-                                <property name="is_important">True</property>
-                                <property name="action_name">.uno:DecrementIndent</property>
-                                <property name="use_underline">True</property>
-                              </object>
-                              <packing>
-                                <property name="expand">False</property>
-                                <property name="homogeneous">True</property>
-                              </packing>
-                            </child>
-                          </object>
-                          <packing>
-                            <property name="expand">False</property>
-                            <property name="fill">True</property>
-                            <property name="position">1</property>
-                          </packing>
-                        </child>
-                        <child>
-                          <object class="sfxlo-SidebarToolBox" id="writedirection">
-                            <property name="visible">True</property>
-                            <property name="can_focus">False</property>
-                            <property name="show_arrow">False</property>
-                            <child>
-                              <object class="GtkToolButton" id="lefttoright">
-                                <property name="visible">True</property>
-                                <property name="can_focus">False</property>
-                                <property name="is_important">True</property>
-                                <property name="action_name">.uno:ParaLeftToRight</property>
-                                <property name="use_underline">True</property>
-                              </object>
-                              <packing>
-                                <property name="expand">False</property>
-                                <property name="homogeneous">True</property>
-                              </packing>
-                            </child>
-                            <child>
-                              <object class="GtkToolButton" id="righttoleft">
-                                <property name="visible">True</property>
-                                <property name="can_focus">False</property>
-                                <property name="is_important">True</property>
-                                <property name="action_name">.uno:ParaRightToLeft</property>
-                                <property name="use_underline">True</property>
-                              </object>
-                              <packing>
-                                <property name="expand">False</property>
-                                <property name="homogeneous">True</property>
-                              </packing>
-                            </child>
-                          </object>
-                          <packing>
-                            <property name="expand">False</property>
-                            <property name="fill">True</property>
-                            <property name="pack_type">end</property>
-                            <property name="position">2</property>
-                          </packing>
-                        </child>
                       </object>
                       <packing>
                         <property name="expand">False</property>
@@ -957,119 +915,253 @@
                             <property name="position">0</property>
                           </packing>
                         </child>
+                      </object>
+                      <packing>
+                        <property name="expand">False</property>
+                        <property name="fill">True</property>
+                        <property name="position">1</property>
+                      </packing>
+                    </child>
+                  </object>
+                  <packing>
+                    <property name="expand">False</property>
+                    <property name="fill">True</property>
+                    <property name="position">7</property>
+                  </packing>
+                </child>
+                <child>
+                  <object class="GtkBox" id="box28">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <child>
+                      <object class="GtkBox" id="box31">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="orientation">vertical</property>
                         <child>
-                          <object class="GtkSeparator" id="separator28">
-                            <property name="visible">True</property>
-                            <property name="can_focus">False</property>
-                            <property name="orientation">vertical</property>
-                          </object>
-                          <packing>
-                            <property name="expand">False</property>
-                            <property name="fill">True</property>
-                            <property name="position">1</property>
-                          </packing>
-                        </child>
-                        <child>
-                          <object class="sfxlo-SidebarToolBox" id="line">
+                          <object class="GtkBox" id="box66">
                             <property name="visible">True</property>
                             <property name="can_focus">False</property>
-                            <property name="halign">end</property>
+                            <property name="spacing">12</property>
                             <child>
-                              <object class="GtkMenuToolButton" id="LineSpacing">
+                              <object class="sfxlo-SidebarToolBox" id="indent">
                                 <property name="visible">True</property>
                                 <property name="can_focus">False</property>
-                                <property name="halign">end</property>
-                                <property name="action_name">.uno:LineSpacing</property>
-                                <property name="use_underline">True</property>
+                                <property name="has_tooltip">True</property>
+                                <property name="tooltip_text" translatable="yes">Indent</property>
+                                <child>
+                                  <object class="GtkToolButton" id="increaseindent1">
+                                    <property name="use_action_appearance">False</property>
+                                    <property name="visible">True</property>
+                                    <property name="can_focus">False</property>
+                                    <property name="has_tooltip">True</property>
+                                    <property name="tooltip_text" translatable="yes">Increase Indent</property>
+                                    <property name="is_important">True</property>
+                                    <property name="action_name">.uno:IncrementIndent</property>
+                                    <property name="use_underline">True</property>
+                                  </object>
+                                  <packing>
+                                    <property name="expand">False</property>
+                                    <property name="homogeneous">True</property>
+                                  </packing>
+                                </child>
+                                <child>
+                                  <object class="GtkToolButton" id="decreaseindent1">
+                                    <property name="use_action_appearance">False</property>
+                                    <property name="visible">True</property>
+                                    <property name="can_focus">False</property>
+                                    <property name="has_tooltip">True</property>
+                                    <property name="tooltip_text" translatable="yes">Decrease Indent</property>
+                                    <property name="is_important">True</property>
+                                    <property name="action_name">.uno:DecrementIndent</property>
+                                    <property name="use_underline">True</property>
+                                  </object>
+                                  <packing>
+                                    <property name="expand">False</property>
+                                    <property name="homogeneous">True</property>
+                                  </packing>
+                                </child>
                               </object>
                               <packing>
                                 <property name="expand">False</property>
-                                <property name="homogeneous">False</property>
+                                <property name="fill">True</property>
+                                <property name="position">1</property>
+                              </packing>
+                            </child>
+                            <child>
+                              <object class="sfxlo-SidebarToolBox" id="writedirection">
+                                <property name="visible">True</property>
+                                <property name="can_focus">False</property>
+                                <property name="show_arrow">False</property>
+                                <child>
+                                  <object class="GtkToolButton" id="lefttoright1">
+                                    <property name="visible">True</property>
+                                    <property name="can_focus">False</property>
+                                    <property name="is_important">True</property>
+                                    <property name="action_name">.uno:ParaLeftToRight</property>
+                                    <property name="use_underline">True</property>
+                                  </object>
+                                  <packing>
+                                    <property name="expand">False</property>
+                                    <property name="homogeneous">True</property>
+                                  </packing>
+                                </child>
+                                <child>
+                                  <object class="GtkToolButton" id="righttoleft1">
+                                    <property name="visible">True</property>
+                                    <property name="can_focus">False</property>
+                                    <property name="is_important">True</property>
+                                    <property name="action_name">.uno:ParaRightToLeft</property>
+                                    <property name="use_underline">True</property>
+                                  </object>
+                                  <packing>
+                                    <property name="expand">False</property>
+                                    <property name="homogeneous">True</property>
+                                  </packing>
+                                </child>
+                              </object>
+                              <packing>
+                                <property name="expand">False</property>
+                                <property name="fill">True</property>
+                                <property name="pack_type">end</property>
+                                <property name="position">2</property>
                               </packing>
                             </child>
                           </object>
                           <packing>
                             <property name="expand">False</property>
-                            <property name="fill">False</property>
-                            <property name="position">2</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
                           </packing>
                         </child>
                         <child>
-                          <object class="sfxlo-SidebarToolBox" id="verticalalignment">
+                          <object class="GtkBox" id="box32">
                             <property name="visible">True</property>
                             <property name="can_focus">False</property>
-                            <property name="has_tooltip">True</property>
-                            <property name="tooltip_text" translatable="yes">Vertical Alignment</property>
-                            <property name="halign">end</property>
-                            <property name="hexpand">True</property>
-                            <property name="show_arrow">False</property>
+                            <property name="spacing">6</property>
                             <child>
-                              <object class="GtkToolButton" id="cellverttop">
+                              <object class="GtkSeparator" id="separator20">
                                 <property name="visible">True</property>
                                 <property name="can_focus">False</property>
-                                <property name="action_name">.uno:CellVertTop</property>
-                                <property name="use_underline">True</property>
+                                <property name="orientation">vertical</property>
                               </object>
                               <packing>
                                 <property name="expand">False</property>
-                                <property name="homogeneous">True</property>
+                                <property name="fill">True</property>
+                                <property name="position">1</property>
                               </packing>
                             </child>
                             <child>
-                              <object class="GtkToolButton" id="cellvertcenter">
+                              <object class="sfxlo-SidebarToolBox" id="line">
                                 <property name="visible">True</property>
                                 <property name="can_focus">False</property>
-                                <property name="action_name">.uno:CellVertCenter</property>
-                                <property name="use_underline">True</property>
+                                <property name="halign">end</property>
+                                <child>
+                                  <object class="GtkMenuToolButton" id="LineSpacing1">
+                                    <property name="visible">True</property>
+                                    <property name="can_focus">False</property>
+                                    <property name="halign">end</property>
+                                    <property name="action_name">.uno:LineSpacing</property>
+                                    <property name="use_underline">True</property>
+                                  </object>
+                                  <packing>
+                                    <property name="expand">False</property>
+                                    <property name="homogeneous">False</property>
+                                  </packing>
+                                </child>
                               </object>
                               <packing>
                                 <property name="expand">False</property>
-                                <property name="homogeneous">True</property>
+                                <property name="fill">False</property>
+                                <property name="position">2</property>
                               </packing>
                             </child>
                             <child>
-                              <object class="GtkToolButton" id="cellvertbottom">
+                              <object class="sfxlo-SidebarToolBox" id="verticalalignment">
                                 <property name="visible">True</property>
                                 <property name="can_focus">False</property>
-                                <property name="action_name">.uno:CellVertBottom</property>
-                                <property name="use_underline">True</property>
+                                <property name="has_tooltip">True</property>
+                                <property name="tooltip_text" translatable="yes">Vertical Alignment</property>
+                                <property name="halign">end</property>
+                                <property name="hexpand">True</property>
+                                <property name="show_arrow">False</property>
+                                <child>
+                                  <object class="GtkToolButton" id="cellverttop1">
+                                    <property name="visible">True</property>
+                                    <property name="can_focus">False</property>
+                                    <property name="action_name">.uno:CellVertTop</property>
+                                    <property name="use_underline">True</property>
+                                  </object>
+                                  <packing>
+                                    <property name="expand">False</property>
+                                    <property name="homogeneous">True</property>
+                                  </packing>
+                                </child>
+                                <child>
+                                  <object class="GtkToolButton" id="cellvertcenter1">
+                                    <property name="visible">True</property>
+                                    <property name="can_focus">False</property>
+                                    <property name="action_name">.uno:CellVertCenter</property>
+                                    <property name="use_underline">True</property>
+                                  </object>
+                                  <packing>
+                                    <property name="expand">False</property>
+                                    <property name="homogeneous">True</property>
+                                  </packing>
+                                </child>
+                                <child>
+                                  <object class="GtkToolButton" id="cellvertbottom1">
+                                    <property name="visible">True</property>
+                                    <property name="can_focus">False</property>
+                                    <property name="action_name">.uno:CellVertBottom</property>
+                                    <property name="use_underline">True</property>
+                                  </object>
+                                  <packing>
+                                    <property name="expand">False</property>
+                                    <property name="homogeneous">True</property>
+                                  </packing>
+                                </child>
                               </object>
                               <packing>
                                 <property name="expand">False</property>
-                                <property name="homogeneous">True</property>
+                                <property name="fill">True</property>
+                                <property name="position">4</property>
                               </packing>
                             </child>
                           </object>
                           <packing>
                             <property name="expand">False</property>
                             <property name="fill">True</property>
-                            <property name="position">4</property>
+                            <property name="position">1</property>
                           </packing>
                         </child>
                       </object>
                       <packing>
                         <property name="expand">False</property>
                         <property name="fill">True</property>
+                        <property name="position">0</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkSeparator" id="separator18">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="orientation">vertical</property>
+                      </object>
+                      <packing>
+                        <property name="expand">False</property>
+                        <property name="fill">True</property>
                         <property name="position">1</property>
                       </packing>
                     </child>
+                    <style>
+                      <class name="priority-1"/>
+                    </style>
                   </object>
                   <packing>
                     <property name="expand">False</property>
                     <property name="fill">True</property>
-                    <property name="position">4</property>
-                  </packing>
-                </child>
-                <child>
-                  <object class="GtkSeparator" id="separator18">
-                    <property name="visible">True</property>
-                    <property name="can_focus">False</property>
-                    <property name="orientation">vertical</property>
-                  </object>
-                  <packing>
-                    <property name="expand">False</property>
-                    <property name="fill">True</property>
-                    <property name="position">5</property>
+                    <property name="position">8</property>
                   </packing>
                 </child>
                 <child>
@@ -1142,40 +1234,57 @@
                         <property name="position">1</property>
                       </packing>
                     </child>
+                    <style>
+                      <class name="priority-3"/>
+                    </style>
                   </object>
                   <packing>
                     <property name="expand">False</property>
                     <property name="fill">True</property>
-                    <property name="position">6</property>
+                    <property name="position">10</property>
                   </packing>
                 </child>
                 <child>
-                  <object class="GtkSeparator" id="separator19">
+                  <object class="GtkBox" id="box30">
                     <property name="visible">True</property>
                     <property name="can_focus">False</property>
-                    <property name="orientation">vertical</property>
-                  </object>
-                  <packing>
-                    <property name="expand">False</property>
-                    <property name="fill">True</property>
-                    <property name="position">7</property>
-                  </packing>
-                </child>
-                <child>
-                  <object class="vcllo-SmallButton" id="SearchDialog">
-                    <property name="visible">True</property>
-                    <property name="can_focus">True</property>
-                    <property name="receives_default">True</property>
-                    <property name="action_name">.uno:SearchDialog</property>
-                    <property name="image">SearchDialogImg</property>
-                    <property name="relief">none</property>
-                    <property name="image_position">top</property>
-                    <property name="always_show_image">True</property>
+                    <child>
+                      <object class="GtkSeparator" id="separator19">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="orientation">vertical</property>
+                      </object>
+                      <packing>
+                        <property name="expand">False</property>
+                        <property name="fill">True</property>
+                        <property name="position">0</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="vcllo-SmallButton" id="SearchDialog">
+                        <property name="visible">True</property>
+                        <property name="can_focus">True</property>
+                        <property name="receives_default">True</property>
+                        <property name="action_name">.uno:SearchDialog</property>
+                        <property name="image">SearchDialogImg</property>
+                        <property name="relief">none</property>
+                        <property name="image_position">top</property>
+                        <property name="always_show_image">True</property>
+                      </object>
+                      <packing>
+                        <property name="expand">False</property>
+                        <property name="fill">True</property>
+                        <property name="position">1</property>
+                      </packing>
+                    </child>
+                    <style>
+                      <class name="priority-4"/>
+                    </style>
                   </object>
                   <packing>
                     <property name="expand">False</property>
                     <property name="fill">True</property>
-                    <property name="position">8</property>
+                    <property name="position">12</property>
                   </packing>
                 </child>
               </object>
diff --git a/vcl/source/window/builder.cxx b/vcl/source/window/builder.cxx
index 7e449982c5d4..eee51ba2a15e 100644
--- a/vcl/source/window/builder.cxx
+++ b/vcl/source/window/builder.cxx
@@ -20,6 +20,7 @@
 #include <vcl/field.hxx>
 #include <vcl/fixed.hxx>
 #include <vcl/fixedhyper.hxx>
+#include <vcl/IPrioritable.hxx>
 #include <vcl/layout.hxx>
 #include <vcl/lstbox.hxx>
 #include <vcl/menubtn.hxx>
@@ -1960,7 +1961,8 @@ void VclBuilder::handleTabChild(vcl::Window *pParent, xmlreader::XmlReader &read
             }
             else if (name.equals("style"))
             {
-                context = handleStyle(reader);
+                int nPriority = 0;
+                context = handleStyle(reader, nPriority);
                 --nLevel;
             }
             else if (name.equals("property"))
@@ -2862,6 +2864,13 @@ VclPtr<vcl::Window> VclBuilder::handleObject(vcl::Window *pParent, xmlreader::Xm
             }
             else if (name.equals("items"))
                 aItems = handleItems(reader, sID);
+            else if (name.equals("style"))
+            {
+                int nPriority = 0;
+                handleStyle(reader, nPriority);
+                if (nPriority != 0)
+                    dynamic_cast<vcl::IPrioritable*>(pCurrentChild.get())->SetPriority(nPriority);
+            }
             else
             {
                 ++nLevel;
@@ -3048,7 +3057,7 @@ void VclBuilder::applyPackingProperty(vcl::Window *pCurrent,
     }
 }
 
-std::vector<vcl::EnumContext::Context> VclBuilder::handleStyle(xmlreader::XmlReader &reader)
+std::vector<vcl::EnumContext::Context> VclBuilder::handleStyle(xmlreader::XmlReader &reader, int &nPriority)
 {
     std::vector<vcl::EnumContext::Context> aContext;
 
@@ -3070,7 +3079,24 @@ std::vector<vcl::EnumContext::Context> VclBuilder::handleStyle(xmlreader::XmlRea
             ++nLevel;
             if (name.equals("class"))
             {
-                aContext.push_back(getContext(reader));
+                OString classStyle = getStyleClass(reader);
+
+                if (classStyle.startsWith("context-"))
+                {
+                    OString sContext = classStyle.copy(classStyle.indexOf('-') + 1);
+                    OUString sContext2 = OUString(sContext.getStr(), sContext.getLength(), RTL_TEXTENCODING_UTF8);
+                    aContext.push_back(vcl::EnumContext::GetContextEnum(sContext2));
+                }
+                else if (classStyle.startsWith("priority-"))
+                {
+                    OString aPriority = classStyle.copy(classStyle.indexOf('-') + 1);
+                    OUString aPriority2 = OUString(aPriority.getStr(), aPriority.getLength(), RTL_TEXTENCODING_UTF8);
+                    nPriority = aPriority2.toInt32();
+                }
+                else
+                {
+                    SAL_WARN("vcl.layout", "unknown class: " << classStyle.getStr());
+                }
             }
         }
 
@@ -3086,32 +3112,22 @@ std::vector<vcl::EnumContext::Context> VclBuilder::handleStyle(xmlreader::XmlRea
     return aContext;
 }
 
-vcl::EnumContext::Context VclBuilder::getContext(xmlreader::XmlReader &reader)
+OString VclBuilder::getStyleClass(xmlreader::XmlReader &reader)
 {
     xmlreader::Span name;
     int nsId;
+    OString aRet;
 
     while (reader.nextAttribute(&nsId, &name))
     {
         if (name.equals("name"))
         {
             name = reader.getAttributeValue(false);
-            OString sKey(name.begin, name.length);
-
-            if (sKey.startsWith("context-"))
-            {
-                OString sContext = sKey.copy(sKey.indexOf('-') + 1);
-                OUString sContext2 = OUString(sContext.getStr(), sContext.getLength(), RTL_TEXTENCODING_UTF8);
-                return vcl::EnumContext::GetContextEnum(sContext2);
-            }
-            else
-            {
-                SAL_WARN("vcl.layout", "unknown class: " << sKey.getStr());
-            }
+            aRet = OString (name.begin, name.length);
         }
     }
 
-    return vcl::EnumContext::Context::Context_Any;
+    return aRet;
 }
 
 OString VclBuilder::getTranslation(const OString &rID, const OString &rProperty) const
diff --git a/vcl/source/window/layout.cxx b/vcl/source/window/layout.cxx
index e48a78d7e57b..f93aaaaa2af5 100644
--- a/vcl/source/window/layout.cxx
+++ b/vcl/source/window/layout.cxx
@@ -11,6 +11,7 @@
 #include <o3tl/enumarray.hxx>
 #include <o3tl/enumrange.hxx>
 #include <vcl/dialog.hxx>
+#include <vcl/IPrioritable.hxx>
 #include <vcl/layout.hxx>
 #include <vcl/msgbox.hxx>
 #include <vcl/svapp.hxx>
@@ -20,6 +21,7 @@
 
 VclContainer::VclContainer(vcl::Window *pParent, WinBits nStyle)
     : Window(WINDOW_CONTAINER)
+    , IPrioritable()
     , m_bLayoutDirty(true)
 {
     ImplInit(pParent, nStyle, nullptr);