implement slider functionality
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@ -1,8 +1,11 @@
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#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(QWidget *parent)
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: QWidget(parent)
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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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@ -22,11 +25,35 @@ void Handle::paintEvent(QPaintEvent *event)
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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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_eventPos = event->globalPos();
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_offset = pos();
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}
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void Handle::mouseReleaseEvent(QMouseEvent *event)
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{
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Q_UNUSED(event)
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}
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void Handle::mouseMoveEvent(QMouseEvent *event)
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{
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Q_UNUSED(event)
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QWidget *container = parentWidget();
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const QPoint d = _offset + event->globalPos() - _eventPos;
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const QSize s = sizeHint();
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QRect r(_slider->orientation() == Qt::Horizontal
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? QPoint(qBound(0, d.x(), container->width()-s.width()), container->height()/2-s.height()/2)
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: QPoint(container->width()/2-s.width()/2, qBound(0, d.y(), container->height()-s.height())), s);
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setGeometry(r);
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}
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Slider::Slider(QWidget *parent)
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: QWidget(parent),
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_handle(new Handle(this))
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_handle(new Handle(this)),
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_orientation(Qt::Horizontal)
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{
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_handle->setGeometry(10, 10, 30, 30);
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}
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Slider::~Slider()
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@ -37,7 +64,30 @@ 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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_handle->setGeometry(QRect(Qt::Horizontal == _orientation
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? QPoint(event->pos().x()-s.width()/2, height()/2-s.height()/2)
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: QPoint(width()/2-s.width()/2, event->pos().y()-s.height()/2), s));
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QWidget::mousePressEvent(event);
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}
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@ -2,17 +2,30 @@
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#define SLIDER_H
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#include <QWidget>
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#include <QPoint>
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class Slider;
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class Handle : public QWidget
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{
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Q_OBJECT
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public:
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explicit Handle(QWidget *parent = 0);
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explicit Handle(Slider *slider);
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~Handle();
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inline QSize sizeHint() const { return QSize(16, 16); }
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protected:
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void paintEvent(QPaintEvent *event);
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void mousePressEvent(QMouseEvent *event);
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void mouseReleaseEvent(QMouseEvent *event);
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void mouseMoveEvent(QMouseEvent *event);
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private:
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Slider *const _slider;
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QPoint _eventPos;
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QPoint _offset;
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};
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class Slider : public QWidget
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@ -23,11 +36,16 @@ public:
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explicit Slider(QWidget *parent = 0);
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~Slider();
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inline void setOrientation(Qt::Orientation orientation) { _orientation = orientation; }
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inline Qt::Orientation orientation() const { return _orientation; }
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protected:
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void paintEvent(QPaintEvent *event);
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void mousePressEvent(QMouseEvent *event);
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private:
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Handle *const _handle;
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Handle *const _handle;
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Qt::Orientation _orientation;
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};
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#endif // SLIDER_H
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@ -22,7 +22,7 @@ SliderExamples::SliderExamples(QWidget *parent)
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Frame *frame = new Frame;
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frame->setCodeSnippet(
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"---"
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"Slider *slider = new Slider;"
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);
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frame->setWidget(view);
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@ -35,13 +35,15 @@ SliderExamples::SliderExamples(QWidget *parent)
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widget->setLayout(layout);
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Slider *slider = new Slider;
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slider->setOrientation(Qt::Vertical);
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ExampleView *view = new ExampleView;
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view->setWidget(slider);
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Frame *frame = new Frame;
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frame->setCodeSnippet(
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"---"
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"Slider *slider = new Slider;\n"
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"slider->setOrientation(Qt::Vertical);"
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);
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frame->setWidget(view);
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