dde-dock/frame/util/statebutton.cpp

#include "statebutton.h"

#include <QIcon>
#include <QPainter>
#include <QtMath>

StateButton::StateButton(QWidget *parent)
    : QWidget(parent)
{
    setAttribute(Qt::WA_TranslucentBackground, true);
}

void StateButton::setType(StateButton::Type type)
{
    m_type =  type;
    update();
}

void StateButton::paintEvent(QPaintEvent *event)
{
    QWidget::paintEvent(event);
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing, true);

    int radius = qMin(width(), height());
    painter.setPen(QPen(Qt::NoPen));
    painter.setBrush(palette().color(QPalette::Highlight));
    painter.drawPie(rect(), 0, 360 * 16);

    QPen pen(palette().color(QPalette::Text), radius / 100.0 * 6.20, Qt::SolidLine, Qt::SquareCap, Qt::MiterJoin);
    switch (m_type) {
    case Check: drawCheck(painter, pen, radius);    break;
    case Fork:  drawFork(painter, pen, radius);     break;
    }
}

void StateButton::mousePressEvent(QMouseEvent *event)
{
    QWidget::mousePressEvent(event);
    emit click();
}

void StateButton::enterEvent(QEvent *event)
{
    QWidget::enterEvent(event);
    setType(Fork);
}

void StateButton::leaveEvent(QEvent *event)
{
    QWidget::leaveEvent(event);
    setType(Check);
}

void StateButton::drawCheck(QPainter &painter, QPen &pen, int radius)
{
    painter.setPen(pen);

    QPointF points[3] = {
        QPointF(radius / 100.0 * 32,  radius / 100.0 * 57),
        QPointF(radius / 100.0 * 45,  radius / 100.0 * 70),
        QPointF(radius / 100.0 * 75,  radius / 100.0 * 35)
    };

    painter.drawPolyline(points, 3);
}

void StateButton::drawFork(QPainter &painter, QPen &pen, int radius)
{
    pen.setCapStyle(Qt::RoundCap);
    painter.setPen(pen);

    QPointF pointsl[2] = {
        QPointF(radius / 100.0 * 35,  radius / 100.0 * 35),
        QPointF(radius / 100.0 * 65,  radius / 100.0 * 65)
    };

    painter.drawPolyline(pointsl, 2);

    QPointF pointsr[2] = {
        QPointF(radius / 100.0 * 65,  radius / 100.0 * 35),
        QPointF(radius / 100.0 * 35,  radius / 100.0 * 65)
    };

    painter.drawPolyline(pointsr, 2);
}