(C++) QGraphicsProxyWidget eexample 4

QGraphicsProxyWidget example 4 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: CppQGraphicsProxyWidgetExample4.pro


QT       += core

QT       += gui

QMAKE_CXXFLAGS += -Wextra -Werror

TARGET = CppQGraphicsProxyWidgetExample4

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 MyItem : public QWidget

{

  MyItem(QWidget *parent = 0, Qt::WindowFlags f = 0)

    : QWidget(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;

};



struct MyView : public QGraphicsView

{

  MyView(QWidget *parent = 0)

    : QGraphicsView(parent),

      m_scene(new QGraphicsScene(this))

  {

    this->setScene(m_scene);



    //Create the QLineEdit instances

    const int sz = 10;

    std::vector<QGraphicsProxyWidget *> proxies;

    for (int i=0; i!=sz; ++i)

    {

      MyItem * const mywidget = new MyItem;

      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 = m_scene->addWidget(mywidget);

      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

    }

  }

  QGraphicsScene * const m_scene;

};



int main(int argc, char **argv)

{

  //Create the application

  QApplication app(argc, argv);

  MyView view;

  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();

  return app.exec();

}

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