(C++) QGraphicsProxyWidget example 3

 

QGraphicsProxyWidget example 3 is a QGraphicsProxyWidget example.

 

• View a screenshot of 'CppQGraphicsProxyWidgetExample3' (png)
• View a screenshot of 'CppQGraphicsProxyWidgetExample3' (png)
• Download the Qt Creator project 'CppQGraphicsProxyWidgetExample3' (zip)
• Download the Windows executable of 'CppQGraphicsProxyWidgetExample3' (zip)

 

 

 

 

 

Technical facts

 

Application type(s)

• Desktop application

Operating system(s) or programming environment(s)

• Lubuntu 12.10 (quantal)

IDE(s):

• Qt Creator 2.5.2

Project type:

• GUI application

C++ standard:

• C++98

Compiler(s):

• G++ 4.7.2

Libraries used:

• Qt: version 4.8.3 (32 bit)
• STL: GNU ISO C++ Library, version 4.7.2

 

 

 

 

 

Qt project file: CppQGraphicsProxyWidgetExample3.pro

 

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QT       += core QT       += gui QMAKE_CXXFLAGS += -Wextra -Werror TARGET = CppQGraphicsProxyWidgetExample3 CONFIG   += console CONFIG   -= app_bundle TEMPLATE = app SOURCES += main.cpp

 

 

 

 

 

main.cpp

 

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#include <cassert> #include <cmath> #include <QApplication> #include <QDesktopWidget> #include <QGraphicsProxyWidget> #include <QGraphicsScene> #include <QGraphicsView> #include <QLineEdit> #include <QLabel> #include <QVBoxLayout> #include <QDialog> #include <QGraphicsSceneMouseEvent> #include <QPointer> struct MyWidget : public QDialog {   MyWidget(QWidget *parent = 0, Qt::WindowFlags f = 0)     : QDialog(parent,f),       m_edit(new QLineEdit(this)),       m_label(new QLabel(this))   {     assert(!this->layout());     QVBoxLayout * const layout = new QVBoxLayout(this);     this->setLayout(layout);     layout->addWidget(m_label);     layout->addWidget(m_edit);   }   QLineEdit * const m_edit;   QLabel * const m_label; }; int main(int argc, char **argv) {   //Create the application   QApplication app(argc, argv);   //Create the Qt Graphics Framework components   QGraphicsScene scene;   QGraphicsView view(&scene);   view.setGeometry(0,0,600,400);   {     //Put the dialog in the screen center     const QRect screen = QApplication::desktop()->screenGeometry();     view.move( screen.center() - view.rect().center() );   }   view.show();   //Create the QLineEdit instances   const int sz = 10;   std::vector<QGraphicsProxyWidget *> proxies;   for (int i=0; i!=sz; ++i)   {     MyWidget * const mywidget = new MyWidget;     mywidget->setGeometry(0,0,64,22);     mywidget->m_label->setText(QString("#") + QString::number(i));     mywidget->m_edit->setText(QString("Text ") + QString::number(i));     //Add the QWidget and obtain its proxy     QGraphicsProxyWidget * const proxy = scene.addWidget(mywidget,Qt::Window);     proxies.push_back(proxy);   }   const double ray = 150.0; //pixels   for (int i=0; i!=sz; ++i)   {     const double angle = 2.0 * M_PI * static_cast<double>(i) / static_cast<double>(sz);     const int x = static_cast<int>(0.0 + (std::sin(angle) * ray));     const int y = static_cast<int>(0.0 - (std::cos(angle) * ray));     QGraphicsProxyWidget * const proxy = proxies[i];     proxy->setRotation(angle * 360.0 / (2.0 * M_PI));     proxy->setPos(x,y);     //proxy->setFlag(QGraphicsItem::ItemIsMovable,true); //No need to set this flag   }   return app.exec(); }