QGraphicsLinearLayout does not behave like QVBoxLayout

[jobrandt]

The left side(QGraphicsView,QGraphicsLinearLayout based)of the window should behave like the right side(QWidget,QVBoxLayout based) of the window.
This means QTreeWidget and QPushBotton should fill the whole area of QGraphicsView. Also if the window is resized.

Any ideas how to fix this code? Or is there a complete different way?

GraphicWidgetTest::GraphicWidgetTest(QWidget *parent, Qt::WFlags flags)
	: QMainWindow(parent, flags)
{
	ui.setupUi(this);
 
	// left side
	QGraphicsView *view = new QGraphicsView(ui.centralWidget);
	QGraphicsScene *scene = new QGraphicsScene;
	view->setScene(scene);
 
	//scene->setBackgroundBrush(QBrush(QColor(Qt::red)));
	QGraphicsLinearLayout *vboxl = new QGraphicsLinearLayout;
	vboxl->setOrientation(Qt::Vertical);
	vboxl->addItem(scene->addWidget(new QTreeWidget));
	vboxl->addItem(scene->addWidget(new QPushButton("buttonl")));
 
	QGraphicsWidget *form = new QGraphicsWidget;
	form->setLayout(vboxl);
	scene->addItem(form);
 
	// right side
	QWidget *right = new QWidget(ui.centralWidget);
	QVBoxLayout *vboxr = new QVBoxLayout;
	vboxr->addWidget(new QTreeWidget);
	vboxr->addWidget(new QPushButton("buttonr"));
	right->setLayout(vboxr);
 
	//
	QHBoxLayout *hbox = new QHBoxLayout;
	hbox->addWidget(view);
	hbox->addWidget(right);
 
	ui.centralWidget->setLayout(hbox);
}

GraphicWidgetTest::GraphicWidgetTest(QWidget *parent, Qt::WFlags flags)
	: QMainWindow(parent, flags)
{
	ui.setupUi(this);

	// left side
	QGraphicsView *view = new QGraphicsView(ui.centralWidget);
	QGraphicsScene *scene = new QGraphicsScene;
	view->setScene(scene);

	//scene->setBackgroundBrush(QBrush(QColor(Qt::red)));
	QGraphicsLinearLayout *vboxl = new QGraphicsLinearLayout;
	vboxl->setOrientation(Qt::Vertical);
	vboxl->addItem(scene->addWidget(new QTreeWidget));
	vboxl->addItem(scene->addWidget(new QPushButton("buttonl")));

	QGraphicsWidget *form = new QGraphicsWidget;
	form->setLayout(vboxl);
	scene->addItem(form);

	// right side
	QWidget *right = new QWidget(ui.centralWidget);
	QVBoxLayout *vboxr = new QVBoxLayout;
	vboxr->addWidget(new QTreeWidget);
	vboxr->addWidget(new QPushButton("buttonr"));
	right->setLayout(vboxr);

	//
	QHBoxLayout *hbox = new QHBoxLayout;
	hbox->addWidget(view);
	hbox->addWidget(right);

	ui.centralWidget->setLayout(hbox);
}

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[wysota]

To do that you have to scale the scene according to the size of the view (i.e. in it's resizeEvent).

[bunjee]

You have to be cautious with QGraphicsLinearLayout.

It's not called QGraphicsBoxLayout for a reason. It doesn't behave exactly the same.

[jobrandt]

I have implemented the resizeEvent(). It works good if the size of the window is increased. But it does not decrease the size of QTreeWidget,QPushBotton if the windows size is decreased.
Do i have to resize any other Widget?

GraphicWidgetTest::GraphicWidgetTest(QWidget *parent, Qt::WFlags flags)
	: QMainWindow(parent, flags)
{
	ui.setupUi(this);
 
	// left side
	view = new QGraphicsView(ui.centralWidget);
	scene = new QGraphicsScene;
	view->setScene(scene);
 
	scene->setBackgroundBrush(QBrush(QColor(Qt::red)));
 
	left = new QGraphicsWidget();
	left->resize(view->size());
	QVBoxLayout *vboxw = new QVBoxLayout;
	Tree = new QTreeWidget;
	Button = new QPushButton("buttonl");
    QGraphicsProxyWidget *gTree = scene->addWidget(Tree);
	QGraphicsProxyWidget *gButton = scene->addWidget(Button);
	QGraphicsLinearLayout *vboxl = new QGraphicsLinearLayout;
	vboxl->setOrientation(Qt::Vertical);
	left->setLayout(vboxl);
	vboxw->addWidget(Tree);
	vboxw->addWidget(Button);
	scene->addItem(left);
	//vboxl->addItem(scene->addWidget(left));
	vboxl->addItem(gTree);
	vboxl->addItem(gButton);
 
	//QGraphicsWidget *form = new QGraphicsWidget;
	//form->setLayout(vboxl);
	//scene->addItem(form);
 
	// right side
	right = new QWidget(ui.centralWidget);
    QVBoxLayout *vboxr = new QVBoxLayout;
	vboxr->addWidget(new QTreeWidget);
	vboxr->addWidget(new QPushButton("buttonr"));
	right->setLayout(vboxr);
 
	//
	QHBoxLayout *hbox = new QHBoxLayout;
	hbox->addWidget(view);
	hbox->addWidget(right);
 
	ui.centralWidget->setLayout(hbox);
 
	connect(Button,SIGNAL(clicked()),this,SLOT(buttonrClicked()));
}
 
GraphicWidgetTest::~GraphicWidgetTest()
{
}
 
void GraphicWidgetTest::buttonrClicked()
{
	left->resize(view->size().width()-3,view->size().height()-3);
}
 
void GraphicWidgetTest::resizeEvent(QResizeEvent *event)
{
	left->resize(view->size().width()-3,view->size().height()-3);
}

GraphicWidgetTest::GraphicWidgetTest(QWidget *parent, Qt::WFlags flags)
	: QMainWindow(parent, flags)
{
	ui.setupUi(this);

	// left side
	view = new QGraphicsView(ui.centralWidget);
	scene = new QGraphicsScene;
	view->setScene(scene);

	scene->setBackgroundBrush(QBrush(QColor(Qt::red)));
	
	left = new QGraphicsWidget();
	left->resize(view->size());
	QVBoxLayout *vboxw = new QVBoxLayout;
	Tree = new QTreeWidget;
	Button = new QPushButton("buttonl");
    QGraphicsProxyWidget *gTree = scene->addWidget(Tree);
	QGraphicsProxyWidget *gButton = scene->addWidget(Button);
	QGraphicsLinearLayout *vboxl = new QGraphicsLinearLayout;
	vboxl->setOrientation(Qt::Vertical);
	left->setLayout(vboxl);
	vboxw->addWidget(Tree);
	vboxw->addWidget(Button);
	scene->addItem(left);
	//vboxl->addItem(scene->addWidget(left));
	vboxl->addItem(gTree);
	vboxl->addItem(gButton);

	//QGraphicsWidget *form = new QGraphicsWidget;
	//form->setLayout(vboxl);
	//scene->addItem(form);

	// right side
	right = new QWidget(ui.centralWidget);
    QVBoxLayout *vboxr = new QVBoxLayout;
	vboxr->addWidget(new QTreeWidget);
	vboxr->addWidget(new QPushButton("buttonr"));
	right->setLayout(vboxr);

	//
	QHBoxLayout *hbox = new QHBoxLayout;
	hbox->addWidget(view);
	hbox->addWidget(right);

	ui.centralWidget->setLayout(hbox);
	
	connect(Button,SIGNAL(clicked()),this,SLOT(buttonrClicked()));
}

GraphicWidgetTest::~GraphicWidgetTest()
{
}

void GraphicWidgetTest::buttonrClicked()
{
	left->resize(view->size().width()-3,view->size().height()-3);
}

void GraphicWidgetTest::resizeEvent(QResizeEvent *event)
{
	left->resize(view->size().width()-3,view->size().height()-3);
}

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