implement slider functionality

This commit is contained in:
laserpants 2016-03-23 08:35:41 +03:00
parent dcef5d8ba5
commit bd5a9adfea
3 changed files with 78 additions and 8 deletions

View File

@ -1,8 +1,11 @@
#include <QPainter>
#include <QDebug>
#include <QMouseEvent>
#include "slider.h"
Handle::Handle(QWidget *parent)
: QWidget(parent)
Handle::Handle(Slider *slider)
: QWidget(slider),
_slider(slider)
{
}
@ -22,11 +25,35 @@ void Handle::paintEvent(QPaintEvent *event)
QWidget::paintEvent(event);
}
void Handle::mousePressEvent(QMouseEvent *event)
{
_eventPos = event->globalPos();
_offset = pos();
}
void Handle::mouseReleaseEvent(QMouseEvent *event)
{
Q_UNUSED(event)
}
void Handle::mouseMoveEvent(QMouseEvent *event)
{
Q_UNUSED(event)
QWidget *container = parentWidget();
const QPoint d = _offset + event->globalPos() - _eventPos;
const QSize s = sizeHint();
QRect r(_slider->orientation() == Qt::Horizontal
? QPoint(qBound(0, d.x(), container->width()-s.width()), container->height()/2-s.height()/2)
: QPoint(container->width()/2-s.width()/2, qBound(0, d.y(), container->height()-s.height())), s);
setGeometry(r);
}
Slider::Slider(QWidget *parent)
: QWidget(parent),
_handle(new Handle(this))
_handle(new Handle(this)),
_orientation(Qt::Horizontal)
{
_handle->setGeometry(10, 10, 30, 30);
}
Slider::~Slider()
@ -37,7 +64,30 @@ void Slider::paintEvent(QPaintEvent *event)
{
QPainter painter(this);
const int x = width()/2;
const int y = height()/2;
QRect r = Qt::Vertical == _orientation
? QRect(x-2, 0, 4, height())
: QRect(0, y-2, width(), 4);
QBrush brush;
brush.setStyle(Qt::SolidPattern);
brush.setColor(QColor(0, 0, 0));
painter.fillRect(r, brush);
painter.drawRect(rect().adjusted(0, 0, -1, -1));
QWidget::paintEvent(event);
}
void Slider::mousePressEvent(QMouseEvent *event)
{
const QSize s = _handle->sizeHint();
_handle->setGeometry(QRect(Qt::Horizontal == _orientation
? QPoint(event->pos().x()-s.width()/2, height()/2-s.height()/2)
: QPoint(width()/2-s.width()/2, event->pos().y()-s.height()/2), s));
QWidget::mousePressEvent(event);
}

View File

@ -2,17 +2,30 @@
#define SLIDER_H
#include <QWidget>
#include <QPoint>
class Slider;
class Handle : public QWidget
{
Q_OBJECT
public:
explicit Handle(QWidget *parent = 0);
explicit Handle(Slider *slider);
~Handle();
inline QSize sizeHint() const { return QSize(16, 16); }
protected:
void paintEvent(QPaintEvent *event);
void mousePressEvent(QMouseEvent *event);
void mouseReleaseEvent(QMouseEvent *event);
void mouseMoveEvent(QMouseEvent *event);
private:
Slider *const _slider;
QPoint _eventPos;
QPoint _offset;
};
class Slider : public QWidget
@ -23,11 +36,16 @@ public:
explicit Slider(QWidget *parent = 0);
~Slider();
inline void setOrientation(Qt::Orientation orientation) { _orientation = orientation; }
inline Qt::Orientation orientation() const { return _orientation; }
protected:
void paintEvent(QPaintEvent *event);
void mousePressEvent(QMouseEvent *event);
private:
Handle *const _handle;
Handle *const _handle;
Qt::Orientation _orientation;
};
#endif // SLIDER_H

View File

@ -22,7 +22,7 @@ SliderExamples::SliderExamples(QWidget *parent)
Frame *frame = new Frame;
frame->setCodeSnippet(
"---"
"Slider *slider = new Slider;"
);
frame->setWidget(view);
@ -35,13 +35,15 @@ SliderExamples::SliderExamples(QWidget *parent)
widget->setLayout(layout);
Slider *slider = new Slider;
slider->setOrientation(Qt::Vertical);
ExampleView *view = new ExampleView;
view->setWidget(slider);
Frame *frame = new Frame;
frame->setCodeSnippet(
"---"
"Slider *slider = new Slider;\n"
"slider->setOrientation(Qt::Vertical);"
);
frame->setWidget(view);