qt-material-widgets/components/textfield.cpp

#include <QPropertyAnimation>
#include <QWidget>
#include <QPainter>
#include <QDebug>
#include "textfield.h"
#include "lib/style.h"

TextField::TextField(QWidget *parent)
    : QLineEdit(parent),
      _animation(new QPropertyAnimation(this)),
      _progress(1)
{
    setStyle(&Style::instance());

    _animation->setPropertyName("progress");
    _animation->setTargetObject(this);
    _animation->setEasingCurve(QEasingCurve::InCubic);
    _animation->setDuration(350);
    _animation->setStartValue(1);
    _animation->setEndValue(0);
}

TextField::~TextField()
{
}

void TextField::setProgress(qreal progress)
{
    if (_progress == progress)
        return;
    _progress = progress;

    emit progressChanged(progress);
    update();
}

void TextField::focusInEvent(QFocusEvent *event)
{
    _animation->setDirection(QAbstractAnimation::Forward);
    _animation->start();

    QLineEdit::focusInEvent(event);
}

void TextField::focusOutEvent(QFocusEvent *event)
{
    _animation->setDirection(QAbstractAnimation::Backward);
    _animation->start();

    QLineEdit::focusOutEvent(event);
}

void TextField::mousePressEvent(QMouseEvent *event)
{
    QLineEdit::mousePressEvent(event);
}

void TextField::mouseReleaseEvent(QMouseEvent *event)
{
    QLineEdit::mouseReleaseEvent(event);
}

void TextField::paintEvent(QPaintEvent *event)
{
    QLineEdit::paintEvent(event);

    QPainter painter(this);

    QBrush brush;
    brush.setStyle(Qt::SolidPattern);

    if (!qFuzzyCompare(1, _progress)) {

        painter.setPen(Qt::NoPen);
        painter.setBrush(brush);

        int w = _progress*static_cast<qreal>(width()/2);

        painter.drawRect(w, height()-2, width()-w*2, 2);
    }
}