120 lines
2.5 KiB
C++
120 lines
2.5 KiB
C++
#include <QPainter>
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#include <QDebug>
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#include <QMouseEvent>
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#include "slider.h"
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Handle::Handle(Slider *slider)
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: QWidget(slider),
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_slider(slider)
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{
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}
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Handle::~Handle()
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{
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}
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void Handle::refreshGeometry()
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{
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QWidget *container = parentWidget();
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const QSize s = sizeHint();
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setGeometry(QRect(_slider->orientation() == Qt::Horizontal
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? QPoint(qBound(0, _position.x(), container->width()-s.width()), container->height()/2-s.height()/2)
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: QPoint(container->width()/2-s.width()/2, qBound(0, _position.y(), container->height()-s.height())), s));
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update();
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}
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void Handle::paintEvent(QPaintEvent *event)
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{
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QPainter painter(this);
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QPen pen;
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pen.setColor(Qt::black);
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pen.setWidth(1);
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painter.setPen(pen);
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painter.drawRect(rect().adjusted(0, 0, -1, -1));
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QWidget::paintEvent(event);
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}
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void Handle::mousePressEvent(QMouseEvent *event)
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{
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_offset = pos() - event->globalPos();
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}
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void Handle::mouseMoveEvent(QMouseEvent *event)
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{
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setPosition(_offset + event->globalPos());
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}
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Slider::Slider(QWidget *parent)
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: QWidget(parent),
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_drag(false),
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_handle(new Handle(this)),
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_orientation(Qt::Horizontal)
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{
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}
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Slider::~Slider()
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{
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}
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void Slider::paintEvent(QPaintEvent *event)
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{
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QPainter painter(this);
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const int x = width()/2;
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const int y = height()/2;
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QRect r = Qt::Vertical == _orientation
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? QRect(x-2, 0, 4, height())
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: QRect(0, y-2, width(), 4);
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QBrush brush;
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brush.setStyle(Qt::SolidPattern);
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brush.setColor(QColor(0, 0, 0));
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painter.fillRect(r, brush);
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painter.drawRect(rect().adjusted(0, 0, -1, -1));
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QWidget::paintEvent(event);
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}
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void Slider::mousePressEvent(QMouseEvent *event)
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{
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const QSize s = _handle->sizeHint();
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const QPoint p = event->pos();
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const QPoint newPos = p - QPoint(s.width()/2, s.height()/2);
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if (Qt::Horizontal == _orientation ? touchesRail(p.y(), height()/2) : touchesRail(p.x(), width()/2)) {
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_handle->setPosition(newPos);
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_handle->setOffset(newPos - event->globalPos());
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_drag = true;
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} else {
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_drag = false;
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}
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QWidget::mousePressEvent(event);
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}
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void Slider::mouseMoveEvent(QMouseEvent *event)
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{
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if (_drag) {
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_handle->setPosition(_handle->offset() + event->globalPos());
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}
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QWidget::mouseMoveEvent(event);
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}
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void Slider::resizeEvent(QResizeEvent *event)
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{
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_handle->refreshGeometry();
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QWidget::resizeEvent(event);
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}
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bool Slider::touchesRail(int p, int x) const
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{
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return (p >= x-2 && p < x+2);
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}
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