[Qt-interest] widget in dockwidget do not get resized

[Yifei Li]

On Nov 3, 2011, at 6:52 PM, Andreas Pakulat wrote:

> On 03.11.11 17:10:00, Yifei Li wrote:
>> 
>> The following is a minimal example that shows my problem.  TreeWidget does not show up in the dock widget.
>> 
>> #include <QtGui/QApplication>
>> #include <QMainWindow>
>> #include <QDockWidget>
>> #include <QVBoxLayout>
>> #include <QTreeWidget>
>> #include <QTextEdit>
>> 
>> class MainWindow : public QMainWindow {
>> public:
>>    MainWindow(QWidget* parent = 0)
>>        :QMainWindow(parent)
>>    {
>>        QTextEdit* edit = new QTextEdit();
>>        this->setCentralWidget(edit);
>>        QDockWidget * dock = new QDockWidget(this);
>>        QVBoxLayout* layout = new QVBoxLayout();
>>        QTreeWidget* tree = new QTreeWidget();
>>        layout->addWidget(tree);
>>        dock->setLayout(layout);
> 
> This is your problem. You're not supposed to set a layout on a
> dockwidget since QDockWidget will have its own layout (probably set when
> using addDockWidget, but didn't find the place right away in the
> sources). This is so it can have a maximize/minimize button etc. when
> necessary. Thats the same situation as QMainWindow and its central
> widget, so simply use the setWidget function and supply an intermediate
> QWidget on which you set the layout:
> 
>        QWidget* tmpwidget = new QWidget();
>        tmpwidget->setLayout(layout);
>        dock->setwidget(tmpwidget);

I was wrong. This approach is correct.  The reason it did not work was due to some other problem in my application.

Thank you for your help
> 
> You should also have gotten a warning on stderr (or Windows debug
> channel) when running your example that a layout is being set on
> QDockWidget while it already has one. This also hints at the fact that
> Qt internally sets a layout on the dockwidget when adding it to a
> mainwindow.
> 
> Andreas
> 
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