OpenBoard/src/gui/UBWidgetMirror.cpp

/*
 * Copyright (C) 2012 Webdoc SA
 *
 * This file is part of Open-Sankoré.
 *
 * Open-Sankoré is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation, version 2,
 * with a specific linking exception for the OpenSSL project's
 * "OpenSSL" library (or with modified versions of it that use the
 * same license as the "OpenSSL" library).
 *
 * Open-Sankoré 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 GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with Open-Sankoré; if not, see
 * <http://www.gnu.org/licenses/>.
 */


#include "UBWidgetMirror.h"

#include "core/memcheck.h"

UBWidgetMirror::UBWidgetMirror(QWidget* sourceWidget, QWidget* parent)
    : QWidget(parent, 0)
    , mSourceWidget(sourceWidget)
{
    mSourceWidget->installEventFilter(this);
}

UBWidgetMirror::~UBWidgetMirror()
{
    // NOOP
}

bool UBWidgetMirror::eventFilter(QObject *obj, QEvent *event)
{
    bool result = QObject::eventFilter(obj, event);

    if (event->type() == QEvent::Paint && obj == mSourceWidget)
    {
        QPaintEvent *paintEvent = static_cast<QPaintEvent *>(event);
        update(paintEvent->rect());
    }

    return result;
}

void UBWidgetMirror::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);

    painter.setBackgroundMode(Qt::OpaqueMode);
    painter.setBackground(Qt::black);

    mSourceWidget->render(&painter, event->rect().topLeft(), QRegion(event->rect()));
}


void UBWidgetMirror::setSourceWidget(QWidget *sourceWidget)
{
    if (mSourceWidget)
    {
        mSourceWidget->removeEventFilter(this);
    }

    mSourceWidget = sourceWidget;

    mSourceWidget->installEventFilter(this);

    update();
}