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strawberry-audio-player-win.../src/widgets/volumeslider.cpp

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/***************************************************************************
amarokslider.cpp - description
-------------------
begin : Dec 15 2003
copyright : (C) 2003 by Mark Kretschmann
email : markey@web.de
copyright : (C) 2005 by Gábor Lehel
email : illissius@gmail.com
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "config.h"
#include "volumeslider.h"
#include <QApplication>
#include <QWidget>
#include <QMap>
#include <QString>
#include <QStringBuilder>
#include <QImage>
#include <QPainter>
#include <QPainterPath>
#include <QPalette>
#include <QFont>
#include <QBrush>
#include <QPen>
#include <QPoint>
#include <QPolygon>
#include <QRect>
#include <QVector>
#include <QMenu>
#include <QStyle>
#include <QStyleOption>
#include <QTimer>
#include <QAction>
#include <QSlider>
#include <QLinearGradient>
#include <QStyleOptionViewItem>
#include <QFlags>
#include <QtEvents>
SliderSlider::SliderSlider(Qt::Orientation orientation, QWidget* parent, uint max)
: QSlider(orientation, parent),
m_sliding(false),
m_outside(false),
m_prevValue(0) {
setRange(0, max);
}
void SliderSlider::wheelEvent(QWheelEvent* e) {
if (orientation() == Qt::Vertical) {
// Will be handled by the parent widget
e->ignore();
return;
}
// Position Slider (horizontal)
int step = e->angleDelta().y() * 1500 / 18;
int nval = qBound(minimum(), QSlider::value() + step, maximum());
QSlider::setValue(nval);
emit sliderReleased(value());
}
void SliderSlider::mouseMoveEvent(QMouseEvent *e) {
if (m_sliding) {
// feels better, but using set value of 20 is bad of course
QRect rect(-20, -20, width() + 40, height() + 40);
if (orientation() == Qt::Horizontal && !rect.contains(e->pos())) {
if (!m_outside) QSlider::setValue(m_prevValue);
m_outside = true;
}
else {
m_outside = false;
slideEvent(e);
emit sliderMoved(value());
}
}
else
QSlider::mouseMoveEvent(e);
}
void SliderSlider::slideEvent(QMouseEvent* e) {
QStyleOptionSlider option;
initStyleOption(&option);
QRect sliderRect(style()->subControlRect(QStyle::CC_Slider, &option, QStyle::SC_SliderHandle, this));
QSlider::setValue(
orientation() == Qt::Horizontal
? ((QApplication::layoutDirection() == Qt::RightToLeft)
? QStyle::sliderValueFromPosition(
minimum(), maximum(),
width() - (e->pos().x() - sliderRect.width() / 2),
width() + sliderRect.width(), true)
: QStyle::sliderValueFromPosition(
minimum(), maximum(),
e->pos().x() - sliderRect.width() / 2,
width() - sliderRect.width()))
: QStyle::sliderValueFromPosition(
minimum(), maximum(), e->pos().y() - sliderRect.height() / 2,
height() - sliderRect.height()));
}
void SliderSlider::mousePressEvent(QMouseEvent* e) {
QStyleOptionSlider option;
initStyleOption(&option);
QRect sliderRect(style()->subControlRect(QStyle::CC_Slider, &option, QStyle::SC_SliderHandle, this));
m_sliding = true;
m_prevValue = QSlider::value();
if (!sliderRect.contains(e->pos())) mouseMoveEvent(e);
}
void SliderSlider::mouseReleaseEvent(QMouseEvent*) {
if (!m_outside && QSlider::value() != m_prevValue)
emit sliderReleased(value());
m_sliding = false;
m_outside = false;
}
void SliderSlider::setValue(int newValue) {
// don't adjust the slider while the user is dragging it!
if (!m_sliding || m_outside)
QSlider::setValue(adjustValue(newValue));
else
m_prevValue = newValue;
}
//////////////////////////////////////////////////////////////////////////////////////////
/// CLASS PrettySlider
//////////////////////////////////////////////////////////////////////////////////////////
#define THICKNESS 7
#define MARGIN 3
PrettySlider::PrettySlider(Qt::Orientation orientation, SliderMode mode, QWidget* parent, uint max)
: SliderSlider(orientation, parent, max), m_mode(mode) {
if (m_mode == Pretty) {
setFocusPolicy(Qt::NoFocus);
}
}
void PrettySlider::mousePressEvent(QMouseEvent* e) {
SliderSlider::mousePressEvent(e);
slideEvent(e);
}
void PrettySlider::slideEvent(QMouseEvent* e) {
if (m_mode == Pretty)
QSlider::setValue(
orientation() == Qt::Horizontal
? QStyle::sliderValueFromPosition(minimum(), maximum(), e->pos().x(), width() - 2)
: QStyle::sliderValueFromPosition(minimum(), maximum(), e->pos().y(), height() - 2));
else
SliderSlider::slideEvent(e);
}
namespace Amarok {
namespace ColorScheme {
extern QColor Background;
extern QColor Foreground;
}
}
#if 0
/** these functions aren't required in our fixed size world, but they may become useful one day **/
QSize PrettySlider::minimumSizeHint() const {
return sizeHint();
}
QSize PrettySlider::sizeHint() const {
constPolish();
return (orientation() == Horizontal
? QSize( maxValue(), THICKNESS + MARGIN )
: QSize( THICKNESS + MARGIN, maxValue() )).expandedTo( QApplit ication::globalStrut() );
}
#endif
//////////////////////////////////////////////////////////////////////////////////////////
/// CLASS VolumeSlider
//////////////////////////////////////////////////////////////////////////////////////////
VolumeSlider::VolumeSlider(QWidget* parent, uint max)
: SliderSlider(Qt::Horizontal, parent, max),
m_animCount(0),
m_animTimer(new QTimer(this)),
m_pixmapInset(QPixmap(drawVolumePixmap ())) {
setFocusPolicy(Qt::NoFocus);
// Store theme colors to check theme change at paintEvent
m_previous_theme_text_color = palette().color(QPalette::WindowText);
m_previous_theme_highlight_color = palette().color(QPalette::Highlight);
drawVolumeSliderHandle();
generateGradient();
setMinimumWidth(m_pixmapInset.width());
setMinimumHeight(m_pixmapInset.height());
connect(m_animTimer, SIGNAL(timeout()), this, SLOT(slotAnimTimer()));
}
void VolumeSlider::SetEnabled(const bool enabled) {
QSlider::setEnabled(enabled);
QSlider::setVisible(enabled);
}
void VolumeSlider::generateGradient() {
const QImage mask(":/pictures/volumeslider-gradient.png");
QImage gradient_image(mask.size(), QImage::Format_ARGB32_Premultiplied);
QPainter p(&gradient_image);
QLinearGradient gradient(gradient_image.rect().topLeft(), gradient_image.rect().topRight());
gradient.setColorAt(0, palette().color(QPalette::Window));
gradient.setColorAt(1, palette().color(QPalette::Highlight));
p.fillRect(gradient_image.rect(), QBrush(gradient));
p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
p.drawImage(0, 0, mask);
p.end();
m_pixmapGradient = QPixmap::fromImage(gradient_image);
}
void VolumeSlider::slotAnimTimer() {
if (m_animEnter) {
m_animCount++;
update();
if (m_animCount == ANIM_MAX - 1) m_animTimer->stop();
}
else {
m_animCount--;
update();
if (m_animCount == 0) m_animTimer->stop();
}
}
void VolumeSlider::mousePressEvent(QMouseEvent* e) {
if (e->button() != Qt::RightButton) {
SliderSlider::mousePressEvent(e);
slideEvent(e);
}
}
void VolumeSlider::contextMenuEvent(QContextMenuEvent* e) {
QMap<QAction*, int> values;
QMenu menu;
menu.setTitle("Volume");
values[menu.addAction("100%")] = 100;
values[menu.addAction("80%")] = 80;
values[menu.addAction("60%")] = 60;
values[menu.addAction("40%")] = 40;
values[menu.addAction("20%")] = 20;
values[menu.addAction("0%")] = 0;
QAction* ret = menu.exec(mapToGlobal(e->pos()));
if (ret) {
QSlider::setValue(values[ret]);
emit sliderReleased(values[ret]);
}
}
void VolumeSlider::slideEvent(QMouseEvent* e) {
QSlider::setValue(QStyle::sliderValueFromPosition(minimum(), maximum(), e->pos().x(), width() - 2));
}
void VolumeSlider::wheelEvent(QWheelEvent* e) {
const uint step = e->angleDelta().y() / (e->angleDelta().x() == 0 ? 30 : -30);
QSlider::setValue(QSlider::value() + step);
emit sliderReleased(value());
}
void VolumeSlider::paintEvent(QPaintEvent*) {
QPainter p(this);
const int padding = 7;
const int offset = int(double((width() - 2 * padding) * value()) / maximum());
// If theme changed since last paintEvent, redraw the volume pixmap with new theme colors
if (m_previous_theme_text_color != palette().color(QPalette::WindowText)) {
m_pixmapInset = drawVolumePixmap();
m_previous_theme_text_color = palette().color(QPalette::WindowText);
}
if (m_previous_theme_highlight_color != palette().color(QPalette::Highlight)) {
drawVolumeSliderHandle();
m_previous_theme_highlight_color = palette().color(QPalette::Highlight);
}
p.drawPixmap(0, 0, m_pixmapGradient, 0, 0, offset + padding, 0);
p.drawPixmap(0, 0, m_pixmapInset);
p.drawPixmap(offset - m_handlePixmaps[0].width() / 2 + padding, 0, m_handlePixmaps[m_animCount]);
// Draw percentage number
QStyleOptionViewItem opt;
p.setPen(opt.palette.color(QPalette::Normal, QPalette::Text));
QFont vol_font(opt.font);
vol_font.setPixelSize(9);
p.setFont(vol_font);
const QRect rect(0, 0, 34, 15);
p.drawText(rect, Qt::AlignRight | Qt::AlignVCenter, QString::number(value()) + '%');
}
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
void VolumeSlider::enterEvent(QEnterEvent*) {
#else
void VolumeSlider::enterEvent(QEvent*) {
#endif
m_animEnter = true;
m_animCount = 0;
m_animTimer->start(ANIM_INTERVAL);
}
void VolumeSlider::leaveEvent(QEvent*) {
// This can happen if you enter and leave the widget quickly
if (m_animCount == 0) m_animCount = 1;
m_animEnter = false;
m_animTimer->start(ANIM_INTERVAL);
}
void VolumeSlider::paletteChange(const QPalette&) {
generateGradient();
}
QPixmap VolumeSlider::drawVolumePixmap () const {
QPixmap pixmap(112, 36);
pixmap.fill(Qt::transparent);
QPainter painter(&pixmap);
QPen pen(palette().color(QPalette::WindowText), 0.3, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin);
painter.setPen(pen);
painter.setRenderHint(QPainter::Antialiasing);
painter.setRenderHint(QPainter::SmoothPixmapTransform);
// Draw volume control pixmap
QPolygon poly;
poly << QPoint(6, 21) << QPoint(104, 21) << QPoint(104, 7) << QPoint(6, 16) << QPoint(6, 21);
QPainterPath path;
path.addPolygon(poly);
painter.drawPolygon(poly);
painter.drawLine(6, 29, 104, 29);
// Return QPixmap
return pixmap;
}
void VolumeSlider::drawVolumeSliderHandle() {
QImage pixmapHandle(":/pictures/volumeslider-handle.png");
QImage pixmapHandleGlow(":/pictures/volumeslider-handle_glow.png");
QImage pixmapHandleGlow_image(pixmapHandleGlow.size(), QImage::Format_ARGB32_Premultiplied);
QPainter painter(&pixmapHandleGlow_image);
painter.setRenderHint(QPainter::Antialiasing);
painter.setRenderHint(QPainter::SmoothPixmapTransform);
// repaint volume slider handle glow image with theme highlight color
painter.fillRect(pixmapHandleGlow_image.rect(), QBrush(palette().color(QPalette::Highlight)));
painter.setCompositionMode(QPainter::CompositionMode_DestinationIn);
painter.drawImage(0, 0, pixmapHandleGlow);
// Overlay the volume slider handle image
painter.setCompositionMode(QPainter::CompositionMode_SourceAtop);
painter.drawImage(0, 0, pixmapHandle);
// BEGIN Calculate handle animation pixmaps for mouse-over effect
float opacity = 0.0;
const float step = 1.0 / ANIM_MAX;
QImage dst;
m_handlePixmaps.clear();
for (int i = 0; i < ANIM_MAX; ++i) {
dst = pixmapHandle.copy();
QPainter p(&dst);
p.setOpacity(opacity);
p.drawImage(0, 0, pixmapHandleGlow_image);
p.end();
m_handlePixmaps.append(QPixmap::fromImage(dst));
opacity += step;
}
// END
}
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