Qt 4.8: stareditor.cpp Example File (itemviews/stardelegate/stareditor.cpp)

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# stareditor.cpp Example File

itemviews/stardelegate/stareditor.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
     **     of its contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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     #include <QtGui>

     #include "stareditor.h"
     #include "starrating.h"

     StarEditor::StarEditor(QWidget *parent)
         : QWidget(parent)
     {
         setMouseTracking(true);
         setAutoFillBackground(true);
     }

     QSize StarEditor::sizeHint() const
     {
         return myStarRating.sizeHint();
     }

     void StarEditor::paintEvent(QPaintEvent *)
     {
         QPainter painter(this);
         myStarRating.paint(&painter, rect(), this->palette(),
                            StarRating::Editable);
     }

     void StarEditor::mouseMoveEvent(QMouseEvent *event)
     {
         int star = starAtPosition(event->x());

         if (star != myStarRating.starCount() && star != -1) {
             myStarRating.setStarCount(star);
             update();
         }
     }

     void StarEditor::mouseReleaseEvent(QMouseEvent * /* event */)
     {
         emit editingFinished();
     }

     int StarEditor::starAtPosition(int x)
     {
         int star = (x / (myStarRating.sizeHint().width()
                          / myStarRating.maxStarCount())) + 1;
         if (star <= 0 || star > myStarRating.maxStarCount())
             return -1;

         return star;
     }