- Qt 5.5
- Qt Widgets
- Star Delegate Example
- stareditor.cpp Example File
- Qt 5.5.1 Reference Documentation

# stareditor.cpp Example File

itemviews/stardelegate/stareditor.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
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    #include <QtWidgets>

    #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;
    }