styleanimator.cpp

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/*
 * This program is free 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 GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, see <http://www.gnu.org/licenses/>
 */

#include "styleanimator.h"

#include <QStyleOption>

Animation *StyleAnimator::widgetAnimation(const QWidget *widget) const
{
    if (!widget)
        return nullptr;
    foreach (Animation *a, animations) {
        if (a->widget() == widget)
            return a;
    }
    return nullptr;
}

void Animation::paint(QPainter *painter, const QStyleOption *option)
{
    Q_UNUSED(option)
    Q_UNUSED(painter)
}

void Animation::drawBlendedImage(QPainter *painter, QRect rect, float alpha)
{
    if (m_secondaryImage.isNull() || m_primaryImage.isNull())
        return;

    if (m_tempImage.isNull())
        m_tempImage = m_secondaryImage;

    const int a = qRound(alpha * 256);
    const int ia = 256 - a;
    const int sw = m_primaryImage.width();
    const int sh = m_primaryImage.height();
    const int bpl = m_primaryImage.bytesPerLine();
    switch (m_primaryImage.depth()) {
    case 32: {
        uchar *mixed_data = m_tempImage.bits();
        const uchar *back_data = m_primaryImage.bits();
        const uchar *front_data = m_secondaryImage.bits();
        for (int sy = 0; sy < sh; sy++) {
            quint32 *mixed = reinterpret_cast<quint32 *>(mixed_data);
            const quint32 *back = reinterpret_cast<const quint32 *>(back_data);
            const quint32 *front = reinterpret_cast<const quint32 *>(front_data);
            for (int sx = 0; sx < sw; sx++) {
                quint32 bp = back[sx];
                quint32 fp = front[sx];
                mixed[sx] = qRgba(
                    (qRed(bp) * ia + qRed(fp) * a) >> 8, (qGreen(bp) * ia + qGreen(fp) * a) >> 8,
                    (qBlue(bp) * ia + qBlue(fp) * a) >> 8, (qAlpha(bp) * ia + qAlpha(fp) * a) >> 8);
            }
            mixed_data += bpl;
            back_data += bpl;
            front_data += bpl;
        }
    }
    default:
        break;
    }
    painter->drawImage(rect, m_tempImage);
}

void Transition::paint(QPainter *painter, const QStyleOption *option)
{
    float alpha = 1.0;
    if (m_duration > 0) {
        QTime current = QTime::currentTime();

        if (m_startTime > current)
            m_startTime = current;

        int timeDiff = m_startTime.msecsTo(current);
        alpha = timeDiff / (float)m_duration;
        if (timeDiff > m_duration) {
            m_running = false;
            alpha = 1.0;
        }
    } else {
        m_running = false;
    }
    drawBlendedImage(painter, option->rect, alpha);
}

void StyleAnimator::timerEvent(QTimerEvent *)
{
    for (int i = animations.size() - 1; i >= 0; --i) {
        if (animations[i]->widget())
            animations[i]->widget()->update();

        if (!animations[i]->widget() || !animations[i]->widget()->isEnabled()
            || !animations[i]->widget()->isVisible()
            || animations[i]->widget()->window()->isMinimized() || !animations[i]->running()) {
            Animation *a = animations.takeAt(i);
            delete a;
        }
    }
    if (animations.size() == 0 && animationTimer.isActive()) {
        animationTimer.stop();
    }
}

void StyleAnimator::stopAnimation(const QWidget *w)
{
    for (int i = animations.size() - 1; i >= 0; --i) {
        if (animations[i]->widget() == w) {
            Animation *a = animations.takeAt(i);
            delete a;
            break;
        }
    }
}

void StyleAnimator::startAnimation(Animation *t)
{
    stopAnimation(t->widget());
    animations.append(t);
    if (animations.size() > 0 && !animationTimer.isActive()) {
        animationTimer.start(35, this);
    }
}