Widget stack modified so as to make it possible to split the screen in two and...

Widget stack modified so as to make it possible to split the screen in two and to keep the previous widget in one of the two sub-windows.

GUI_main/UIMainWindow.cpp

@@ -939,26 +939,110 @@ void UIMainWindow::releaseCentralWidgetStack()
 void UIMainWindow::pushCentralWidget( QWidget* widget )
 {
     if( !m_CentralWidgetStack.isEmpty() )
-        m_CentralWidgetStack.last()->hide();
+        m_CentralWidgetStack.last().widget->hide();
 
-    m_CentralWidgetStack.append( widget );
+    WidgetStackItem stackItem;
+    stackItem.isSplit = false;
+    stackItem.widget  = widget;
+
+    m_CentralWidgetStack.append( stackItem );
     centralWidget()->layout()->addWidget( widget );
 
     widget->show();
 }
 
 
+void UIMainWindow::splitCentralWidget( QWidget* widget, Qt::Orientation orientation, Qt::AlignmentFlag location, float spaceRatio )
+{
+    assert( !m_CentralWidgetStack.isEmpty() );
+    //assert( orientation == Qt::Horizontal  &&  (location == Qt::AlignLeft  ||  location == Qt::AlignRight ) );
+    //assert( orientation == Qt::Vertical    &&  (location == Qt::AlignTop   ||  location == Qt::AlignBottom) );
+
+    QWidget *previous = m_CentralWidgetStack.last().widget;
+
+    QGridLayout *layout = new QGridLayout();
+    layout->setContentsMargins( 0, 0, 0, 0 );
+    layout->setSpacing( 4 );
+
+    if( orientation == Qt::Horizontal )
+    {
+        widget->setMaximumWidth( spaceRatio*previous->width() );
+        if( location == Qt::AlignLeft )
+        {
+            layout->addWidget( widget  , 0,0 );
+            layout->addWidget( previous, 0,1 );
+        }
+        else
+        {
+            layout->addWidget( widget  , 0,1 );
+            layout->addWidget( previous, 0,0 );
+        }
+    }
+    else
+    {
+        widget->setMaximumHeight( spaceRatio*previous->height() );
+        if( location == Qt::AlignTop )
+        {
+            layout->addWidget( widget  , 0,0 );
+            layout->addWidget( previous, 1,0 );
+        }
+        else
+        {
+            layout->addWidget( widget  , 1,0 );
+            layout->addWidget( previous, 0,0 );
+        }
+    }
+
+    WidgetStackItem stackItem;
+    stackItem.isSplit     = true;
+    stackItem.widget      = new QWidget();
+
+    stackItem.widget->setLayout( layout );
+
+    m_CentralWidgetStack.append( stackItem );
+    centralWidget()->layout()->addWidget( stackItem.widget );
+
+    widget->show();
+}
+
+
 void UIMainWindow::popCentralWidget()
 {
-    QWidget *widget = m_CentralWidgetStack.takeLast();
-    widget->hide();
+    WidgetStackItem stackItem = m_CentralWidgetStack.takeLast();
+    stackItem.widget->hide();
 
-    if( !m_CentralWidgetStack.isEmpty() )
-        m_CentralWidgetStack.last()->show();
+    if( stackItem.isSplit )
+    {
+        QWidget *widgetToDelete, *widgetToKeep;
+        for( auto obj : stackItem.widget->children() )
+            if( QWidget *w = dynamic_cast<QWidget*>(obj) )
+            {
+                if( w == m_CentralWidgetStack.last().widget )
+                    widgetToKeep = w;
+                else
+                    widgetToDelete = w;
+            }
+
+        centralWidget()->layout()->removeWidget( stackItem.widget );
+        stackItem.widget->setParent( NULL );
+
+        stackItem.widget->layout()->removeWidget( widgetToKeep );
+        widgetToKeep->setParent( NULL );
+
+        centralWidget()->layout()->addWidget( widgetToKeep );
+        delete stackItem.widget;
 
-    centralWidget()->layout()->removeWidget( widget );
-    widget->setParent( NULL );
-    delete widget;
+        widgetToKeep->show();
+    }
+    else
+    {
+        centralWidget()->layout()->removeWidget( stackItem.widget );
+        stackItem.widget->setParent( NULL );
+        delete stackItem.widget;
+
+        if( !m_CentralWidgetStack.isEmpty() )
+            m_CentralWidgetStack.last().widget->show();
+    }
 }
 
 

GUI_main/UIMainWindow.h

@@ -75,7 +75,13 @@ class GUIMAIN_API UIMainWindow : public QMainWindow
     static const int                    RECENT_PROJECT_MAX_LIST_SIZE = 8;
     QList< QAction* >                   m_RecentProjects;
 
-    QList< QWidget* >                   m_CentralWidgetStack;
+    struct WidgetStackItem
+    {
+        QWidget*    widget;
+        bool        isSplit;
+    };
+
+    QList< WidgetStackItem >            m_CentralWidgetStack;
 
 public:
     UIMainWindow(QWidget *parent = 0);
@@ -177,6 +183,7 @@ public slots:
 	void			        projectListContentDropped(QDropEvent* evt);
 
     void                    pushCentralWidget( QWidget* widget );
+    void                    splitCentralWidget( QWidget* widget, Qt::Orientation orientation, Qt::AlignmentFlag location, float spaceRatio );
     void                    popCentralWidget();
 };