(C++) QGraphicsProxyWidget example 3

QGraphicsProxyWidget example 3 is a QGraphicsProxyWidget example.

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


QT       += core

QT       += gui

QMAKE_CXXFLAGS += -Wextra -Werror

TARGET = CppQGraphicsProxyWidgetExample3

CONFIG   += console

CONFIG   -= app_bundle

TEMPLATE = app

SOURCES += main.cpp

main.cpp


#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();

}

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