qt-material-widgets/components/raisedbutton.cpp

#include "raisedbutton.h"
#include <QGraphicsDropShadowEffect>
#include <QEventTransition>
#include <QSignalTransition>
#include <QPropertyAnimation>
#include <QPainter>
#include <QStylePainter>
#include <QStyleOption>
#include <QMouseEvent>
#include <QDebug>
#include "raisedbutton_p.h"

RaisedButtonPrivate::RaisedButtonPrivate(RaisedButton *q)
    : FlatButtonPrivate(q)
{
}

RaisedButtonPrivate::~RaisedButtonPrivate()
{
}

void RaisedButtonPrivate::init()
{
    Q_Q(RaisedButton);

    q->setTextColor(Qt::white);
    q->setPeakOpacity(0.25);

    QGraphicsDropShadowEffect *effect = new QGraphicsDropShadowEffect;
    effect->setBlurRadius(7);
    effect->setOffset(QPointF(0, 0));
    effect->setColor(QColor(0, 0, 0, 60));
    q->setGraphicsEffect(effect);

    QState *normalState = new QState;
    QState *pressedState = new QState;

    machine.addState(normalState);
    machine.addState(pressedState);

    normalState->assignProperty(effect, "offset", QPointF(0, 0));
    normalState->assignProperty(effect, "blurRadius", 7);

    pressedState->assignProperty(effect, "offset", QPointF(0, 6));
    pressedState->assignProperty(effect, "blurRadius", 20);

    QAbstractTransition *transition;
    QPropertyAnimation *animation;

    //

    transition = new QEventTransition(q, QEvent::MouseButtonPress);
    transition->setTargetState(pressedState);

    animation = new QPropertyAnimation(effect, "offset");
    animation->setDuration(100);
    transition->addAnimation(animation);
    animation = new QPropertyAnimation(effect, "blurRadius");
    animation->setDuration(100);
    transition->addAnimation(animation);

    normalState->addTransition(transition);

    //

    transition = new QEventTransition(q, QEvent::MouseButtonDblClick);
    transition->setTargetState(pressedState);

    animation = new QPropertyAnimation(effect, "offset");
    animation->setDuration(100);
    transition->addAnimation(animation);
    animation = new QPropertyAnimation(effect, "blurRadius");
    animation->setDuration(100);
    transition->addAnimation(animation);

    normalState->addTransition(transition);

    //

    transition = new QEventTransition(q, QEvent::MouseButtonRelease);
    transition->setTargetState(normalState);

    animation = new QPropertyAnimation(effect, "offset");
    transition->addAnimation(animation);
    animation->setDuration(100);
    animation = new QPropertyAnimation(effect, "blurRadius");
    animation->setDuration(100);
    transition->addAnimation(animation);

    pressedState->addTransition(transition);

    //

    machine.setInitialState(normalState);
    machine.start();
}

RaisedButton::RaisedButton(QWidget *parent)
    : FlatButton(*new RaisedButtonPrivate(this), parent)
{
    Q_D(RaisedButton);

    d->init();

    setMinimumHeight(42);
}

RaisedButton::~RaisedButton()
{
}

bool RaisedButton::event(QEvent *event)
{
    Q_D(RaisedButton);

    if (QEvent::EnabledChange == event->type()) {
        if (isEnabled()) {
            d->machine.start();
        } else {
            d->machine.stop();
        }
    }
    return FlatButton::event(event);
}

void RaisedButton::paintEvent(QPaintEvent *event)
{
    Q_UNUSED(event)

    Q_D(RaisedButton);

    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);

    painter.save();

    const qreal cr = d->cornerRadius;

    QBrush brush;
    brush.setStyle(Qt::SolidPattern);
    brush.setColor(isEnabled()
       ? backgroundColor() : palette().color(QPalette::Disabled, QPalette::Background));
    painter.setBrush(brush);
    painter.setPen(Qt::NoPen);
    painter.drawRoundedRect(rect(), cr, cr);

    if (isEnabled()) {
        const qreal hs = static_cast<qreal>(width())*d->delegate->focusHaloSize()/2;
        const qreal haloOpacity = d->delegate->focusHaloOpacity();

        brush.setColor(palette().color(QPalette::Active, QPalette::ButtonText));
        painter.setBrush(brush);
        painter.setOpacity(haloOpacity);
        painter.setPen(Qt::NoPen);
        QPointF center = rect().center();
        painter.drawEllipse(center, hs, hs);
    }

    painter.restore();

    QStylePainter style(this);

    QStyleOptionButton option;
    initStyleOption(&option);
    option.features |= QStyleOptionButton::Flat;

    style.drawControl(QStyle::CE_PushButtonLabel, option);
}