Dragging QDockWidgets between QMainWindows

[FelixB]

Hello everyone,

I want to create an application with two windows. One of them is a QMainWindow containing QDockWidgets. I want these DockWidgets to be draggable into the second window. How can that be done? Is there a simple way to reparent the DockWidgets when dragging over second window? Or can the DockWidgets be configured to accept the second window as DockArea?

thanks!
Felix

[FelixB]

I found a solution it still has to be "beautified", but it's working!

static QDockWidget* dw = NULL;
 
void MainWindow::CreateDockWidgets()
{
     QDockWidget *dock = new QDockWidget(tr("Customers"), this);
     dock->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);
     customerList = new QListWidget(dock);
     customerList->addItems(QStringList()
             << "John Doe, Harmony Enterprises, 12 Lakeside, Ambleton"
             << "Jane Doe, Memorabilia, 23 Watersedge, Beaton"
             << "Tammy Shea, Tiblanka, 38 Sea Views, Carlton"
             << "Tim Sheen, Caraba Gifts, 48 Ocean Way, Deal"
             << "Sol Harvey, Chicos Coffee, 53 New Springs, Eccleston"
             << "Sally Hobart, Tiroli Tea, 67 Long River, Fedula");
     dock->setWidget(customerList);
     dock->setFeatures(dock->features() & ~QDockWidget::DockWidgetFloatable);
     addDockWidget(Qt::RightDockWidgetArea, dock);
     viewMenu->addAction(dock->toggleViewAction());
     connect(dock, SIGNAL(topLevelChanged(bool)) , this, SLOT(dragStarted(bool)));
     connect(dock, SIGNAL(dockLocationChanged (Qt::DockWidgetArea)) , this, SLOT(dragEnded()));
 
//... more dock widgets
}
 
 
void MainWindow::dragStarted(bool started)
  {
    if(started)
      {
        if(QDockWidget* dock = qobject_cast<QDockWidget*>(sender()))
          dw = dock;
        else
          dw = NULL;
      }
  }
 
 
 void MainWindow::enterEvent(QEvent* event)
  {
    if(dw && dw->parent() != this)
      {
        addDockWidget(Qt::RightDockWidgetArea, dw);
        dw = NULL;
    }
  }
 
 
 void MainWindow::dragEnded()
  {
    dw = NULL;
  }

static QDockWidget* dw = NULL;

void MainWindow::CreateDockWidgets()
{
     QDockWidget *dock = new QDockWidget(tr("Customers"), this);
     dock->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);
     customerList = new QListWidget(dock);
     customerList->addItems(QStringList()
             << "John Doe, Harmony Enterprises, 12 Lakeside, Ambleton"
             << "Jane Doe, Memorabilia, 23 Watersedge, Beaton"
             << "Tammy Shea, Tiblanka, 38 Sea Views, Carlton"
             << "Tim Sheen, Caraba Gifts, 48 Ocean Way, Deal"
             << "Sol Harvey, Chicos Coffee, 53 New Springs, Eccleston"
             << "Sally Hobart, Tiroli Tea, 67 Long River, Fedula");
     dock->setWidget(customerList);
     dock->setFeatures(dock->features() & ~QDockWidget::DockWidgetFloatable);
     addDockWidget(Qt::RightDockWidgetArea, dock);
     viewMenu->addAction(dock->toggleViewAction());
     connect(dock, SIGNAL(topLevelChanged(bool)) , this, SLOT(dragStarted(bool)));
     connect(dock, SIGNAL(dockLocationChanged (Qt::DockWidgetArea)) , this, SLOT(dragEnded()));

//... more dock widgets
}


void MainWindow::dragStarted(bool started)
  {
    if(started)
      {
        if(QDockWidget* dock = qobject_cast<QDockWidget*>(sender()))
          dw = dock;
        else
          dw = NULL;
      }
  }


 void MainWindow::enterEvent(QEvent* event)
  {
    if(dw && dw->parent() != this)
      {
        addDockWidget(Qt::RightDockWidgetArea, dw);
        dw = NULL;
    }
  }


 void MainWindow::dragEnded()
  {
    dw = NULL;
  }

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[sandyam]

hi ...
i too have same requirement , i have one mainwindow and 4 dockwidgets ,and there is no central widgets also, and all dockwidgets should be floatable , movable ,draggable to all areas , so any idea how i can proceed ..................

thank u in advance ,,,

[FelixB]

Hi,

you set the central widget explicitly to NULL. Then you enable DockNesting and that should be all for your requirements...

just put these lines in your mainwindow constructor:

setDockNestingEnabled(true);
setCentralWidget(0);

setDockNestingEnabled(true);
setCentralWidget(0);

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hope that helps...
Felix