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copied!<p>The simpler way as mentioned by <a href="https://stackoverflow.com/users/307339/stephen-chu">@Stephen Chu</a> is using <a href="http://qt-project.org/doc/qt-4.8/qgraphicsscene.html" rel="nofollow noreferrer"><code>QGraphicsScene</code></a>.</p> <p>Here is an example that prints with qdebug when you click on a rectangle.</p> <p><strong>clickrect.hpp</strong></p> <pre><code>#ifndef _HANDLER_HPP_ #define _HANDLER_HPP_ #include <QtGui> class ClickRect : public QGraphicsRectItem { public: ClickRect( const QRect& rect, const QColor& color, const QString& name, QGraphicsItem* parent = 0); protected: virtual void mousePressEvent(QGraphicsSceneMouseEvent* event); private: QString mName; }; #endif </code></pre> <p><strong>clickrect.cpp</strong></p> <pre><code>#include "clickrect.hpp" ClickRect::ClickRect( const QRect& rect, const QColor& color, const QString& name, QGraphicsItem* par ) : QGraphicsRectItem(rect, par), mName(name) { setBrush(QBrush(color)); } void ClickRect::mousePressEvent(QGraphicsSceneMouseEvent* ev) { qDebug() << mName; } </code></pre> <p><strong>test.cpp</strong></p> <pre><code>#include <QtGui> #include "clickrect.hpp" int main(int argc, char** argv) { QApplication app(argc, argv); QGraphicsScene scene; QGraphicsView view(&scene); view.show(); ClickRect rect_a(QRect(0, 0, 30, 30), QColor("#FDD"), "A"); ClickRect rect_b(QRect(40, 0, 30, 30), QColor("#DFD"), "B"); scene.addItem(&rect_a); scene.addItem(&rect_b); return app.exec(); } </code></pre> <p><strong>CMakeLists.txt</strong></p> <pre><code>cmake_minimum_required(VERSION 2.8) find_package(Qt4 4.8 REQUIRED QtCore QtGui) include(${QT_USE_FILE}) add_executable(test test.cpp clickrect.hpp clickrect.cpp ${MOC_FILES}) target_link_libraries(test ${QT_LIBRARIES}) </code></pre>

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