AboutDialogGraphicsView.cpp

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/***************************************************************************
*   Copyright (C) 2006-2012 by Thomas Schweitzer                          *
*   thomas-schweitzer(at)arcor.de                                         *
*                                                                         *
*   This program is free software; you can redistribute it and/or modify  *
*   it under the terms of the GNU General Public License version 2.0 as   *
*   published by the Free Software Foundation.                            *
*                                                                         *
*   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         *
*   GNU General Public License for more details.                          *
*                                                                         *
*   You should have received a copy of the GNU General Public License     *
*   along with this program in the file LICENSE.GPL; if not, write to the *
*   Free Software Foundation, Inc.,                                       *
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***************************************************************************/

#include "AboutDialogGraphicsView.h"

#include "AboutDialog.h"

#include <QtGui>
#include <QDesktopWidget>
#include <QDate>
#include <QTimeLine>
#include <QSplashScreen>

AboutDialogGraphicsView::AboutDialogGraphicsView(AboutDialog *aboutDialog, QWidget *parentWindow) : QGraphicsView(parentWindow)
    , _aboutDialog(NULL)
    , _graphicsProxyWidget(NULL)
    , _parentWindow(NULL)
    , _timeLine(NULL)
    , _aboutDialogAsSplashScreen(NULL)
{
    _parentWindow = parentWindow;
    setWindowFlags(Qt::SplashScreen);

#ifdef Q_OS_LINUX
    QRect availableGeometry = QApplication::desktop()->availableGeometry();
    QRect newGeometry = QRect( availableGeometry.x(), availableGeometry.y(), availableGeometry.width(), availableGeometry.height() );
#else
    QRect newGeometry = QRect( -1,-1, QApplication::desktop()->rect().width()+2, QApplication::desktop()->rect().height()+2 );
#endif
    setGeometry( newGeometry );

    _aboutDialog = aboutDialog;

    _windowTitleBarWidth = 0;
    _windowPosOffset = 0;

    QGraphicsScene *scene = new QGraphicsScene(this);
    setSceneRect( newGeometry );
    _aboutDialogAsSplashScreen = new QSplashScreen(this);
    _graphicsProxyWidget = scene->addWidget(_aboutDialogAsSplashScreen);
    _graphicsProxyWidget->setWindowFlags( Qt::ToolTip );

    setScene( scene );
    setRenderHint(QPainter::Antialiasing);

    setCacheMode(QGraphicsView::CacheBackground);
    setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);

    connect(_aboutDialog, SIGNAL(finished(int)), this, SLOT(hide()));

    //setWindowOpacity(0.9);

    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    setStyleSheet("AboutDialogGraphicsView { border: 0px; }");

    _timeLine = new QTimeLine(1000, this);
    _timeLine->setFrameRange(270, 0);
    //_timeLine->setUpdateInterval(10);
    //_timeLine->setCurveShape(QTimeLine::EaseInCurve);
    connect(_timeLine, SIGNAL(frameChanged(int)), this, SLOT(updateStep(int)));
}


AboutDialogGraphicsView::~AboutDialogGraphicsView(void) {
}


void AboutDialogGraphicsView::show() {
    // Because on X11 system the window decoration is only available after a widget has been shown once,
    // we can detect _windowTitleBarWidth here for the first time.
    _windowTitleBarWidth = _parentWindow->geometry().y() - _parentWindow->y();
    // If the _windowTitleBarWidth could not be determined, try it a second way. Even the chances are low to get good results.
    if ( _windowTitleBarWidth == 0 )
        _windowTitleBarWidth = _parentWindow->frameGeometry().height() - _parentWindow->geometry().height();
#ifdef Q_OS_LINUX
    if ( _windowTitleBarWidth == 0 ) {
        //TODO: 27 pixel is a fix value for the Ubuntu 10.4 default window theme and so just a workaround for that specific case.
        _windowPosOffset = 27;
        _windowTitleBarWidth = 27;
    }
#endif
    QPixmap originalPixmap = QPixmap::grabWindow(QApplication::desktop()->winId(), QApplication::desktop()->availableGeometry().x(), QApplication::desktop()->availableGeometry().y(), geometry().width(), geometry().height() );
    QBrush brush(originalPixmap);
    QTransform transform;
    transform.translate(0, QApplication::desktop()->availableGeometry().y());
    brush.setTransform(transform);

    setBackgroundBrush(brush);

    _aboutDialogAsSplashScreen->setPixmap( QPixmap::grabWidget(_aboutDialog) );
    _graphicsProxyWidget->setGeometry( _aboutDialog->geometry() );
    _aboutDialog->hide();
    _graphicsProxyWidget->setPos( _parentWindow->geometry().x()+(_parentWindow->geometry().width()-_graphicsProxyWidget->geometry().width()) / 2, _parentWindow->y()+_windowTitleBarWidth-_windowPosOffset);

    QRectF r = _graphicsProxyWidget->boundingRect();
    _graphicsProxyWidget->setTransform(QTransform()
        .translate(r.width() / 2, -_windowTitleBarWidth)
        .rotate(270, Qt::XAxis)
        //.rotate(90, Qt::YAxis)
        //.rotate(5, Qt::ZAxis)
        //.scale(1 + 1.5 * step, 1 + 1.5 * step)
        .translate(-r.width() / 2, _windowTitleBarWidth));

    _graphicsProxyWidget->show();
    //_aboutDialogAsSplashScreen->show();
    QGraphicsView::show();

    connect(_timeLine, SIGNAL(finished()), this, SLOT(showAboutDialog()));
    _timeLine->setDirection(QTimeLine::Forward);
    _timeLine->start();
}


void AboutDialogGraphicsView::updateStep(int step) {
    QRectF r = _graphicsProxyWidget->boundingRect();
    _graphicsProxyWidget->setTransform(QTransform()
        .translate(r.width() / 2, -_windowTitleBarWidth)
        .rotate(step, Qt::XAxis)
        //.rotate(step, Qt::YAxis)
        //.rotate(step * 5, Qt::ZAxis)
        //.scale(1 + 1.5 * step, 1 + 1.5 * step)
        .translate(-r.width() / 2, _windowTitleBarWidth));
    //update();
}


void AboutDialogGraphicsView::showAboutDialog() {
    //hide();
    disconnect(_timeLine, SIGNAL(finished()), this, SLOT(showAboutDialog()));
    _aboutDialog->move( int(_parentWindow->geometry().x()+(_parentWindow->geometry().width()-_graphicsProxyWidget->geometry().width()) / 2), _parentWindow->y()+_windowTitleBarWidth-_windowPosOffset );
    _aboutDialog->exec();
}


void AboutDialogGraphicsView::hide() {
    _graphicsProxyWidget->setPos( _parentWindow->geometry().x()+(_parentWindow->geometry().width()-_graphicsProxyWidget->geometry().width()) / 2, _parentWindow->y()+_windowTitleBarWidth-_windowPosOffset);

    QRectF r = _graphicsProxyWidget->boundingRect();
    _graphicsProxyWidget->setTransform(QTransform()
        .translate(r.width() / 2, -_windowTitleBarWidth)
        .rotate(0, Qt::XAxis)
        //.rotate(90, Qt::YAxis)
        //.rotate(5, Qt::ZAxis)
        //.scale(1 + 1.5 * step, 1 + 1.5 * step)
        .translate(-r.width() / 2, _windowTitleBarWidth));

    _graphicsProxyWidget->show();
    //_aboutDialogAsSplashScreen->show();
    QGraphicsView::show();

    connect(_timeLine, SIGNAL(finished()), this, SLOT(hideReally()));
    _timeLine->setDirection(QTimeLine::Backward);
    _timeLine->start();
}


void AboutDialogGraphicsView::hideReally() {
    disconnect(_timeLine, SIGNAL(finished()), this, SLOT(hideReally()));
    QGraphicsView::hide();
    _parentWindow->activateWindow();
}