Merge branch 'centralwidget'

.gitignore

@@ -382,3 +382,4 @@ MigrationBackup/
 FodyWeavers.xsd
 / build
 /Settings.ini
+.vscode/settings.json

examples/CMakeLists.txt

@@ -2,4 +2,5 @@ cmake_minimum_required(VERSION 3.5)
 project(QtADSExamples LANGUAGES CXX VERSION ${VERSION_SHORT})
 add_subdirectory(simple)
 add_subdirectory(sidebar)
-add_subdirectory(deleteonclose)
+add_subdirectory(deleteonclose)
+add_subdirectory(centralwidget)

examples/centralwidget/CMakeLists.txt

@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.5)
+project(ads_example_centralwidget VERSION ${VERSION_SHORT}) 
+find_package(Qt5 5.5 COMPONENTS Core Gui Widgets REQUIRED)
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+add_executable(CentralWidgetExample WIN32 
+    main.cpp
+    mainwindow.cpp
+    mainwindow.ui
+)
+target_include_directories(CentralWidgetExample PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/../../src")
+target_link_libraries(CentralWidgetExample PRIVATE qtadvanceddocking)
+target_link_libraries(CentralWidgetExample PUBLIC Qt5::Core Qt5::Gui Qt5::Widgets)
+set_target_properties(CentralWidgetExample PROPERTIES 
+    AUTOMOC ON
+    AUTORCC ON
+    AUTOUIC ON
+    CXX_STANDARD 14
+    CXX_STANDARD_REQUIRED ON
+    CXX_EXTENSIONS OFF
+    VERSION ${VERSION_SHORT}
+    EXPORT_NAME "Qt Advanced Docking System Central Widget Example"
+    ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${ads_PlatformDir}/lib"
+    LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${ads_PlatformDir}/lib"
+    RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${ads_PlatformDir}/bin"
+)

examples/centralwidget/centralwidget.pro

@@ -0,0 +1,54 @@
+ADS_OUT_ROOT = $${OUT_PWD}/../..
+
+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+TARGET = CentralWidgetExample
+DESTDIR = $${ADS_OUT_ROOT}/lib
+TEMPLATE = app
+CONFIG += c++14
+CONFIG += debug_and_release
+
+# The following define makes your compiler emit warnings if you use
+# any Qt feature that has been marked deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if it uses deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+SOURCES += \
+    main.cpp \
+    mainwindow.cpp
+
+HEADERS += \
+    mainwindow.h
+
+FORMS += \
+    mainwindow.ui
+
+LIBS += -L$${ADS_OUT_ROOT}/lib
+
+# Dependency: AdvancedDockingSystem (shared)
+CONFIG(debug, debug|release){
+    win32 {
+        LIBS += -lqtadvanceddockingd
+    }
+    else:mac {
+        LIBS += -lqtadvanceddocking_debug
+    }
+    else {
+        LIBS += -lqtadvanceddocking
+    }
+}
+else{
+    LIBS += -lqtadvanceddocking
+}
+
+INCLUDEPATH += ../../src
+DEPENDPATH += ../../src
+

examples/centralwidget/main.cpp

@@ -0,0 +1,10 @@
+#include <mainwindow.h>
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    CMainWindow w;
+    w.show();
+    return a.exec();
+}

examples/centralwidget/mainwindow.cpp

@@ -0,0 +1,83 @@
+#include "mainwindow.h"
+
+#include "ui_mainwindow.h"
+
+#include <QWidgetAction>
+#include <QLabel>
+#include <QCalendarWidget>
+#include <QTreeView>
+#include <QFileSystemModel>
+#include <QTableWidget>
+#include <QHBoxLayout>
+#include <QRadioButton>
+#include <QPushButton>
+#include <QInputDialog>
+#include <QFileDialog>
+#include <QSettings>
+#include <QMessageBox>
+
+#include "DockAreaWidget.h"
+#include "DockAreaTitleBar.h"
+#include "DockAreaTabBar.h"
+#include "FloatingDockContainer.h"
+#include "DockComponentsFactory.h"
+
+using namespace ads;
+
+CMainWindow::CMainWindow(QWidget *parent)
+    : QMainWindow(parent)
+    , ui(new Ui::CMainWindow)
+{
+    ui->setupUi(this);
+    CDockManager::setConfigFlag(CDockManager::OpaqueSplitterResize, true);
+    CDockManager::setConfigFlag(CDockManager::XmlCompressionEnabled, false);
+    DockManager = new CDockManager(this);
+
+    // Set central widget
+    QCalendarWidget* calendar = new QCalendarWidget();
+    CDockWidget* CentralDockWidget = new CDockWidget("CentralWidget");
+    CentralDockWidget->setWidget(calendar);
+    auto* CentralDockArea = DockManager->setCentralWidget(CentralDockWidget);
+    CentralDockArea->setAllowedAreas(DockWidgetArea::OuterDockAreas);
+
+    // create other dock widgets
+    QTreeView* fileTree = new QTreeView();
+    fileTree->setFrameShape(QFrame::NoFrame);
+    QFileSystemModel* fileModel = new QFileSystemModel(fileTree);
+    fileModel->setRootPath(QDir::currentPath());
+    fileTree->setModel(fileModel);
+    CDockWidget* DataDockWidget = new CDockWidget("File system");
+    DataDockWidget->setWidget(fileTree);
+    DataDockWidget->resize(150, 250);
+    DataDockWidget->setMinimumSize(100, 250);
+    auto* fileArea = DockManager->addDockWidget(DockWidgetArea::LeftDockWidgetArea, DataDockWidget, CentralDockArea);
+    ui->menuView->addAction(DataDockWidget->toggleViewAction());
+
+    QTableWidget* table = new QTableWidget();
+    table->setColumnCount(3);
+    table->setRowCount(10);
+    CDockWidget* TableDockWidget = new CDockWidget("Table");
+    TableDockWidget->setWidget(table);
+    TableDockWidget->setMinimumSizeHintMode(CDockWidget::MinimumSizeHintFromDockWidget);
+    TableDockWidget->resize(250, 150);
+    TableDockWidget->setMinimumSize(200,150);
+    DockManager->addDockWidget(DockWidgetArea::BottomDockWidgetArea, TableDockWidget, fileArea);
+    ui->menuView->addAction(TableDockWidget->toggleViewAction());
+
+    QTableWidget* propertiesTable = new QTableWidget();
+    table->setColumnCount(3);
+    table->setRowCount(10);
+    CDockWidget* PropertiesDockWidget = new CDockWidget("Properties");
+    PropertiesDockWidget->setWidget(propertiesTable);
+    PropertiesDockWidget->setMinimumSizeHintMode(CDockWidget::MinimumSizeHintFromDockWidget);
+    PropertiesDockWidget->resize(250, 150);
+    PropertiesDockWidget->setMinimumSize(200,150);
+    DockManager->addDockWidget(DockWidgetArea::RightDockWidgetArea, PropertiesDockWidget, CentralDockArea);
+    ui->menuView->addAction(PropertiesDockWidget->toggleViewAction());
+}
+
+CMainWindow::~CMainWindow()
+{
+    delete ui;
+}
+

examples/centralwidget/mainwindow.h

@@ -0,0 +1,32 @@
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+
+#include "DockManager.h"
+#include "DockAreaWidget.h"
+#include "DockWidget.h"
+
+QT_BEGIN_NAMESPACE
+namespace Ui { class CMainWindow; }
+QT_END_NAMESPACE
+
+class CMainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    CMainWindow(QWidget *parent = nullptr);
+    ~CMainWindow();
+
+private:
+    static const QString kTableTopLayout;
+    static const QString kTableBottomLayout;
+
+    Ui::CMainWindow *ui;
+
+    ads::CDockManager* DockManager;
+    ads::CDockAreaWidget* StatusDockArea;
+    ads::CDockWidget* TimelineDockWidget;
+};
+#endif // MAINWINDOW_H

examples/centralwidget/mainwindow.ui

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>CMainWindow</class>
+ <widget class="QMainWindow" name="CMainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>1284</width>
+    <height>757</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <widget class="QWidget" name="centralwidget"/>
+  <widget class="QMenuBar" name="menubar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>1284</width>
+     <height>21</height>
+    </rect>
+   </property>
+   <widget class="QMenu" name="menuView">
+    <property name="title">
+     <string>View</string>
+    </property>
+   </widget>
+   <addaction name="menuView"/>
+  </widget>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

examples/examples.pro

@@ -1,6 +1,7 @@
 TEMPLATE = subdirs
 
 SUBDIRS = \
+    centralwidget \
 	simple \
 	sidebar \
 	deleteonclose

src/DockAreaWidget.cpp

@@ -441,6 +441,7 @@ void CDockAreaWidget::insertDockWidget(int index, CDockWidget* DockWidget,
 		DockWidget->toggleViewInternal(true);
 	}
 	d->updateTitleBarButtonStates();
+    updateTitleBarVisibility();
 }
 
 
@@ -955,6 +956,18 @@ CDockAreaTitleBar* CDockAreaWidget::titleBar() const
 }
 
 
+//============================================================================
+bool CDockAreaWidget::isCentralWidgetArea() const
+{
+    if (dockWidgetsCount()!= 1)
+    {
+        return false;
+    }
+
+    return dockManager()->centralWidget() == dockWidgets()[0];
+}
+
+
 //============================================================================
 QSize CDockAreaWidget::minimumSizeHint() const
 {

src/DockAreaWidget.h

@@ -154,7 +154,7 @@ public:
 	};
 	Q_DECLARE_FLAGS(DockAreaFlags, eDockAreaFlag)
 
-	/**
+    /**
 	 * Default Constructor
 	 */
 	CDockAreaWidget(CDockManager* DockManager, CDockContainerWidget* parent);
@@ -307,6 +307,11 @@ public:
 	 */
 	void setDockAreaFlag(eDockAreaFlag Flag, bool On);
 
+    /**
+     * Returns true if the area contains the central widget of it's manager.
+     */
+    bool isCentralWidgetArea() const;
+
 public slots:
 	/**
 	 * This activates the tab for the given tab index.

src/DockContainerWidget.cpp

@@ -322,6 +322,18 @@ public:
 		Splitter->setSizes(SplitterSizes);
 	}
 
+    /**
+     * This function forces the dock container widget to update handles of splitters
+     * based if a central widget exists.
+     */
+    void updateSplitterHandles(QSplitter* splitter);
+
+    /**
+     * If no central widget exists, the widgets resize with the container.
+     * If a central widget exists, the widgets surrounding the central widget
+     * do not resize its height or width.
+     */
+    bool widgetResizesWithContainer(QWidget* widget);
 
 // private slots: ------------------------------------------------------------
 	void onDockAreaViewToggled(bool Visible)
@@ -421,7 +433,8 @@ void DockContainerWidgetPrivate::dropIntoContainer(CFloatingDockContainer* Float
 		QSplitter* NewSplitter = newSplitter(InsertParam.orientation());
 		QLayoutItem* li = Layout->replaceWidget(Splitter, NewSplitter);
 		NewSplitter->addWidget(Splitter);
-		Splitter = NewSplitter;
+        updateSplitterHandles(NewSplitter);
+        Splitter = NewSplitter;
 		delete li;
 	}
 
@@ -430,19 +443,21 @@ void DockContainerWidgetPrivate::dropIntoContainer(CFloatingDockContainer* Float
 	if (FloatingSplitter->count() == 1)
 	{
 		insertWidgetIntoSplitter(Splitter, FloatingSplitter->widget(0), InsertParam.append());
-	}
+        updateSplitterHandles(Splitter);
+    }
 	else if (FloatingSplitter->orientation() == InsertParam.orientation())
 	{
         int InsertIndex = InsertParam.append() ? Splitter->count() : 0;
 		while (FloatingSplitter->count())
 		{
             Splitter->insertWidget(InsertIndex++, FloatingSplitter->widget(0));
-		}
+            updateSplitterHandles(Splitter);
-	}
+        }
+    }
 	else
 	{
 		insertWidgetIntoSplitter(Splitter, FloatingSplitter, InsertParam.append());
-	}
+    }
 
 	RootSplitter = Splitter;
 	addDockAreasToList(NewDockAreas);
@@ -453,7 +468,7 @@ void DockContainerWidgetPrivate::dropIntoContainer(CFloatingDockContainer* Float
 	if (!Splitter->isVisible())
 	{
 		Splitter->show();
-	}
+    }
 	_this->dumpLayout();
 }
 
@@ -515,7 +530,8 @@ void DockContainerWidgetPrivate::dropIntoSection(CFloatingDockContainer* Floatin
 		QSplitter* Splitter = newSplitter(InsertParam.orientation());
 		Layout->replaceWidget(TargetArea, Splitter);
 		Splitter->addWidget(TargetArea);
-		TargetAreaSplitter = Splitter;
+        updateSplitterHandles(Splitter);
+        TargetAreaSplitter = Splitter;
 	}
 	int AreaIndex = TargetAreaSplitter->indexOf(TargetArea);
 	auto Widget = FloatingWidget->dockContainer()->findChild<QWidget*>(QString(), Qt::FindDirectChildrenOnly);
@@ -529,7 +545,8 @@ void DockContainerWidgetPrivate::dropIntoSection(CFloatingDockContainer* Floatin
 		if ((FloatingSplitter->orientation() != InsertParam.orientation()) && FloatingSplitter->count() > 1)
 		{
 			TargetAreaSplitter->insertWidget(AreaIndex + InsertParam.insertOffset(), Widget);
-		}
+            updateSplitterHandles(TargetAreaSplitter);
+        }
 		else
 		{
 			AdjustSplitterSizes = (FloatingSplitter->count() == 1);
@@ -537,8 +554,9 @@ void DockContainerWidgetPrivate::dropIntoSection(CFloatingDockContainer* Floatin
 			while (FloatingSplitter->count())
 			{
 				TargetAreaSplitter->insertWidget(InsertIndex++, FloatingSplitter->widget(0));
-			}
+                updateSplitterHandles(TargetAreaSplitter);
-		}
+            }
+        }
 
 		if (AdjustSplitterSizes)
 		{
@@ -557,28 +575,32 @@ void DockContainerWidgetPrivate::dropIntoSection(CFloatingDockContainer* Floatin
 		if ((FloatingSplitter->orientation() != InsertParam.orientation()) && FloatingSplitter->count() > 1)
 		{
 			NewSplitter->addWidget(Widget);
-		}
+            updateSplitterHandles(NewSplitter);
+        }
 		else
 		{
 			AdjustSplitterSizes = (FloatingSplitter->count() == 1);
 			while (FloatingSplitter->count())
 			{
 				NewSplitter->addWidget(FloatingSplitter->widget(0));
-			}
+                updateSplitterHandles(NewSplitter);
-		}
+            }
+        }
 
 		// Save the sizes before insertion and restore it later to prevent
 		// shrinking of existing area
 		auto Sizes = TargetAreaSplitter->sizes();
 		insertWidgetIntoSplitter(NewSplitter, TargetArea, !InsertParam.append());
-		if (AdjustSplitterSizes)
+        updateSplitterHandles(NewSplitter);
+        if (AdjustSplitterSizes)
 		{
 			int Size = TargetAreaSize / 2;
 			NewSplitter->setSizes({Size, Size});
 		}
 		TargetAreaSplitter->insertWidget(AreaIndex, NewSplitter);
 		TargetAreaSplitter->setSizes(Sizes);
-	}
+        updateSplitterHandles(TargetAreaSplitter);
+    }
 
 	addDockAreasToList(NewDockAreas);
 	_this->dumpLayout();
@@ -663,7 +685,8 @@ void DockContainerWidgetPrivate::moveToNewSection(QWidget* Widget, CDockAreaWidg
 	{
 		int TargetAreaSize = (InsertParam.orientation() == Qt::Horizontal) ? TargetArea->width() : TargetArea->height();
 		TargetAreaSplitter->insertWidget(AreaIndex + InsertParam.insertOffset(), NewDockArea);
-		int Size = (TargetAreaSize - TargetAreaSplitter->handleWidth()) / 2;
+        updateSplitterHandles(TargetAreaSplitter);
+        int Size = (TargetAreaSize - TargetAreaSplitter->handleWidth()) / 2;
 		Sizes[AreaIndex] = Size;
 		Sizes.insert(AreaIndex, Size);
 	}
@@ -674,16 +697,58 @@ void DockContainerWidgetPrivate::moveToNewSection(QWidget* Widget, CDockAreaWidg
 		QSplitter* NewSplitter = newSplitter(InsertParam.orientation());
 		NewSplitter->addWidget(TargetArea);
 		insertWidgetIntoSplitter(NewSplitter, NewDockArea, InsertParam.append());
-		int Size = TargetAreaSize / 2;
+        updateSplitterHandles(NewSplitter);
+        int Size = TargetAreaSize / 2;
 		NewSplitter->setSizes({Size, Size});
 		TargetAreaSplitter->insertWidget(AreaIndex, NewSplitter);
-	}
+        updateSplitterHandles(TargetAreaSplitter);
+    }
 	TargetAreaSplitter->setSizes(Sizes);
 
 	addDockAreasToList({NewDockArea});
 }
 
 
+//============================================================================
+void DockContainerWidgetPrivate::updateSplitterHandles( QSplitter* splitter )
+{
+	if (!DockManager->centralWidget() || !splitter)
+	{
+		return;
+	}
+
+	for (int i = 0; i < splitter->count(); ++i)
+    {
+		splitter->setStretchFactor(i, widgetResizesWithContainer(splitter->widget(i)) ? 1 : 0);
+    }
+}
+
+
+//============================================================================
+bool DockContainerWidgetPrivate::widgetResizesWithContainer(QWidget* widget)
+{
+    if (!DockManager->centralWidget())
+    {
+        return true;
+    }
+
+    auto Area = qobject_cast<CDockAreaWidget*>(widget);
+    if(Area)
+    {
+        return Area->isCentralWidgetArea();
+    }
+
+    auto innerSplitter = qobject_cast<CDockSplitter*>(widget);
+    if (innerSplitter)
+    {
+        return innerSplitter->isResizingWithContainer();
+    }
+
+    return false;
+}
+
+
+
 //============================================================================
 void DockContainerWidgetPrivate::moveToContainer(QWidget* Widget, DockWidgetArea area)
 {
@@ -892,6 +957,10 @@ bool DockContainerWidgetPrivate::restoreSplitter(CDockingStateReader& s,
 		Splitter->addWidget(ChildNode);
 		Visible |= ChildNode->isVisibleTo(Splitter);
 	}
+    if(!Testing)
+    {
+       updateSplitterHandles(Splitter);
+    }
 
 	if (Sizes.count() != WidgetCount)
 	{
@@ -1069,7 +1138,8 @@ void DockContainerWidgetPrivate::addDockArea(CDockAreaWidget* NewDockArea, DockW
 	if (Splitter->orientation() == InsertParam.orientation())
 	{
 		insertWidgetIntoSplitter(Splitter, NewDockArea, InsertParam.append());
-		if (Splitter->isHidden())
+        updateSplitterHandles(Splitter);
+        if (Splitter->isHidden())
 		{
 			Splitter->show();
 		}
@@ -1082,14 +1152,16 @@ void DockContainerWidgetPrivate::addDockArea(CDockAreaWidget* NewDockArea, DockW
 			QLayoutItem* li = Layout->replaceWidget(Splitter, NewSplitter);
 			NewSplitter->addWidget(Splitter);
 			NewSplitter->addWidget(NewDockArea);
-			delete li;
+            updateSplitterHandles(NewSplitter);
+            delete li;
 		}
 		else
 		{
 			NewSplitter->addWidget(NewDockArea);
 			QLayoutItem* li = Layout->replaceWidget(Splitter, NewSplitter);
 			NewSplitter->addWidget(Splitter);
-			delete li;
+            updateSplitterHandles(NewSplitter);
+            delete li;
 		}
 		RootSplitter = NewSplitter;
 	}
@@ -1175,7 +1247,8 @@ CDockAreaWidget* DockContainerWidgetPrivate::addDockWidgetToDockArea(DockWidgetA
 	{
 		ADS_PRINT("TargetAreaSplitter->orientation() == InsertParam.orientation()");
 		TargetAreaSplitter->insertWidget(index + InsertParam.insertOffset(), NewDockArea);
-		// do nothing, if flag is not enabled
+        updateSplitterHandles(TargetAreaSplitter);
+        // do nothing, if flag is not enabled
 		if (CDockManager::testConfigFlag(CDockManager::EqualSplitOnInsertion))
 		{
 			adjustSplitterSizesOnInsertion(TargetAreaSplitter);
@@ -1190,9 +1263,11 @@ CDockAreaWidget* DockContainerWidgetPrivate::addDockWidgetToDockArea(DockWidgetA
 		NewSplitter->addWidget(TargetDockArea);
 
 		insertWidgetIntoSplitter(NewSplitter, NewDockArea, InsertParam.append());
-		TargetAreaSplitter->insertWidget(index, NewSplitter);
+        updateSplitterHandles(NewSplitter);
-		if (CDockManager::testConfigFlag(CDockManager::EqualSplitOnInsertion))
+        TargetAreaSplitter->insertWidget(index, NewSplitter);
-		{
+        updateSplitterHandles(TargetAreaSplitter);
+        if (CDockManager::testConfigFlag(CDockManager::EqualSplitOnInsertion))
+        {
 			TargetAreaSplitter->setSizes(TargetAreaSizes);
 			adjustSplitterSizesOnInsertion(NewSplitter);
 		}
@@ -1381,9 +1456,11 @@ void CDockContainerWidget::removeDockArea(CDockAreaWidget* area)
 	}
 
 	delete Splitter;
+    Splitter = nullptr;
 
 emitAndExit:
-	CDockWidget* TopLevelWidget = topLevelDockWidget();
+    updateSplitterHandles(Splitter);
+    CDockWidget* TopLevelWidget = topLevelDockWidget();
 
 	// Updated the title bar visibility of the dock widget if there is only
     // one single visible dock widget
@@ -1732,6 +1809,13 @@ QList<CDockWidget*> CDockContainerWidget::dockWidgets() const
 }
 
 
+//============================================================================
+void CDockContainerWidget::updateSplitterHandles(QSplitter* splitter)
+{
+    d->updateSplitterHandles(splitter);
+}
+
+
 //============================================================================
 CDockWidget::DockWidgetFeatures CDockContainerWidget::features() const
 {

src/DockContainerWidget.h

@@ -155,6 +155,12 @@ protected:
      */
     QList<CDockWidget*> dockWidgets() const;
 
+    /**
+     * This function forces the dock container widget to update handles of splitters
+     * based on resize modes of dock widgets contained in the container.
+     */
+    void updateSplitterHandles(QSplitter* splitter);
+
 public:
 	/**
 	 * Default Constructor

src/DockManager.cpp

@@ -108,6 +108,7 @@ struct DockManagerPrivate
 	bool RestoringState = false;
 	QVector<CFloatingDockContainer*> UninitializedFloatingWidgets;
 	CDockFocusController* FocusController = nullptr;
+    CDockWidget* CentralWidget = nullptr;
 
 	/**
 	 * Private data constructor
@@ -406,6 +407,7 @@ bool DockManagerPrivate::restoreState(const QByteArray& State, int version)
     	return false;
     }
 
+    CentralWidget = nullptr;
     // Hide updates of floating widgets from use
     hideFloatingWidgets();
     markDockWidgetsDirty();
@@ -816,6 +818,40 @@ void CDockManager::loadPerspectives(QSettings& Settings)
 	Settings.endArray();
 }
 
+
+//============================================================================
+CDockWidget* CDockManager::centralWidget() const
+{
+    return d->CentralWidget;
+}
+
+
+//============================================================================
+CDockAreaWidget* CDockManager::setCentralWidget(CDockWidget* widget)
+{
+	if (!widget)
+	{
+		d->CentralWidget = nullptr;
+		return nullptr;
+	}
+
+	// Setting a new central widget is now allowed if there is alread a central
+	// widget
+	if (d->CentralWidget)
+	{
+		return nullptr;
+	}
+
+
+	widget->setFeature(CDockWidget::DockWidgetClosable, false);
+	widget->setFeature(CDockWidget::DockWidgetMovable, false);
+	widget->setFeature(CDockWidget::DockWidgetFloatable, false);
+	d->CentralWidget = widget;
+	CDockAreaWidget* CentralArea = addDockWidget(CenterDockWidgetArea, widget);
+	CentralArea->setDockAreaFlag(CDockAreaWidget::eDockAreaFlag::HideSingleWidgetTitleBar, true);
+	return CentralArea;
+}
+
 //============================================================================
 QAction* CDockManager::addToggleViewActionToMenu(QAction* ToggleViewAction,
 	const QString& Group, const QIcon& GroupIcon)

src/DockManager.h

@@ -378,7 +378,28 @@ public:
 	 */
 	void loadPerspectives(QSettings& Settings);
 
-	/**
+    /**
+     * This function returns managers central widget or nullptr if no central widget is set.
+     */
+    CDockWidget* centralWidget() const;
+
+    /**
+     * Adds dockwidget widget into the central area and marks it as central widget.
+     * If central widget is set, it will be the only dock widget
+     * that will resize with the dock container. A central widget if not
+     * movable, floatable or closable and the titlebar of the central
+     * dock area is not visible.
+     * If the given widget could be set as central widget, the function returns
+     * the created cok area. If the widget could not be set, because there
+     * is already a central widget, this function returns a nullptr.
+     * To clear the central widget, pass a nullptr to the function.
+     * \retval != 0 The dock area that contains the central widget
+     * \retval nullptr Indicates that the given widget can not be set as central
+     *         widget because there is already a central widget.
+     */
+    CDockAreaWidget* setCentralWidget(CDockWidget* widget);
+
+    /**
 	 * Adds a toggle view action to the the internal view menu.
 	 * You can either manage the insertion of the toggle view actions in your
 	 * application or you can add the actions to the internal view menu and

src/DockSplitter.cpp

@@ -102,6 +102,20 @@ QWidget* CDockSplitter::lastWidget() const
 	return (count() > 0) ? widget(count() - 1) : nullptr;
 }
 
+//============================================================================
+bool CDockSplitter::isResizingWithContainer() const
+{
+    for (auto area : findChildren<CDockAreaWidget*>())
+    {
+        if(area->isCentralWidgetArea())
+        {
+            return true;
+        }
+    }
+
+    return false;
+}
+
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockSplitter.h

@@ -71,6 +71,11 @@ public:
 	 * Returns last widget of nullptr is splitter is empty
 	 */
 	QWidget* lastWidget() const;
+
+    /**
+     * Returns true if the splitter contains central widget of dock manager.
+     */
+    bool isResizingWithContainer() const;
 }; // class CDockSplitter
 
 } // namespace ads

src/DockWidget.cpp

@@ -463,6 +463,13 @@ void CDockWidget::setMinimumSizeHintMode(eMinimumSizeHintMode Mode)
 }
 
 
+//============================================================================
+bool CDockWidget::isCentralWidget() const
+{
+    return dockManager()->centralWidget() == this;
+}
+
+
 //============================================================================
 void CDockWidget::toggleView(bool Open)
 {

src/DockWidget.h

@@ -360,6 +360,11 @@ public:
      */
     void setMinimumSizeHintMode(eMinimumSizeHintMode Mode);
 
+    /**
+     * Returns true if the dock widget is set as central widget of it's dock manager
+     */
+    bool isCentralWidget() const;
+
     /**
      * Sets the dock widget icon that is shown in tabs and in toggle view
      * actions