qTox/widget/maskablepixmapwidget.cpp

/*
    Copyright (C) 2014 by Project Tox <https://tox.im>

    This file is part of qTox, a Qt-based graphical interface for Tox.

    This program is libre software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

    See the COPYING file for more details.
*/

#include "maskablepixmapwidget.h"
#include <QPainter>

MaskablePixmapWidget::MaskablePixmapWidget(QWidget *parent, QSize size, QString maskName)
    : QWidget(parent)
{
    setFixedSize(size);
    mask = QPixmap(maskName).scaled(size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
}

void MaskablePixmapWidget::setPixmap(const QPixmap &pmap)
{
    pixmap = pmap.scaled(width(), height(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
}

QPixmap MaskablePixmapWidget::getPixmap() const
{
    return pixmap;
}

void MaskablePixmapWidget::paintEvent(QPaintEvent *)
{
    QPixmap tmp(width(), height());
    tmp.fill(Qt::transparent);

    QPoint offset((width() - pixmap.size().width())/2,(height() - pixmap.size().height())/2); // centering the pixmap

    QPainter painter(&tmp);
    painter.setCompositionMode(QPainter::CompositionMode_Source);
    painter.drawPixmap(offset,pixmap);
    painter.setCompositionMode(QPainter::CompositionMode_DestinationIn);
    painter.drawPixmap(0,0,mask);
    painter.end();

    painter.begin(this);
    painter.drawPixmap(0,0,tmp);
}

void MaskablePixmapWidget::mousePressEvent(QMouseEvent*)
{
    emit clicked();
}