MuseScore/awl/aslider.cpp
Mark McKay ac5bcd58c5 fix #278194 Fix crash opening play panel
No longer emitting event if value unchanged.
2018-11-19 19:44:13 -05:00

345 lines
9.9 KiB
C++

//=============================================================================
// Awl
// Audio Widget Library
//
// Copyright (C) 2002-2006 by Werner Schweer and others
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//=============================================================================
#include "fastlog.h"
#include "aslider.h"
namespace Awl {
//---------------------------------------------------------
// AbstractSlider
//---------------------------------------------------------
AbstractSlider::AbstractSlider(QWidget* parent)
: QWidget(parent), _scaleColor(Qt::darkGray), _scaleValueColor(QColor("#2456aa"))
{
__id = 0;
_value = 0.5;
_minValue = 0.0;
_maxValue = 1.0;
_lineStep = 0.1;
_pageStep = 0.2;
_center = false;
_enableMouseWheel = true;
_invert = false;
_scaleWidth = 4;
_log = false;
_useActualValue = false;
_dclickValue1 = 0.0;
_dclickValue2 = 0.0;
setFocusPolicy(Qt::StrongFocus);
}
//---------------------------------------------------------
// setEnabled
//---------------------------------------------------------
void AbstractSlider::setEnabled(bool val)
{
QWidget::setEnabled(val);
update();
}
//---------------------------------------------------------
// setEnableMouseWheel
//---------------------------------------------------------
void AbstractSlider::setEnableMouseWheel(bool enabled)
{
_enableMouseWheel = enabled;
}
//---------------------------------------------------------
// setCenter
//! If the center flag is set, a notch is drawn to
//! show the center position.
//---------------------------------------------------------
void AbstractSlider::setCenter(bool val)
{
if (val != _center) {
_center = val;
update();
}
}
//!--------------------------------------------------------
// setScaleWidth
//---------------------------------------------------------
void AbstractSlider::setScaleWidth(int val)
{
if (val != _scaleWidth) {
_scaleWidth = val;
update();
}
}
//---------------------------------------------------------
// setScaleColor
//---------------------------------------------------------
void AbstractSlider::setScaleColor(const QColor& c)
{
if (c != _scaleColor) {
_scaleColor = c;
update();
}
}
//---------------------------------------------------------
// setScaleValueColor
//---------------------------------------------------------
void AbstractSlider::setScaleValueColor(const QColor& c)
{
if (c != _scaleValueColor) {
_scaleValueColor = c;
update();
}
}
//---------------------------------------------------------
// wheelEvent
//---------------------------------------------------------
void AbstractSlider::wheelEvent(QWheelEvent* ev)
{
if (!_enableMouseWheel)
return;
int div = 50;
if (ev->modifiers() & Qt::ShiftModifier)
div = 15;
_value += (ev->delta() * lineStep()) / div;
if (_value < _minValue)
_value = _minValue;
else if (_value > _maxValue)
_value = _maxValue;
valueChange();
}
//---------------------------------------------------------
// keyPressEvent
//---------------------------------------------------------
void AbstractSlider::keyPressEvent(QKeyEvent* ev)
{
double oval = _value;
switch (ev->key()) {
case Qt::Key_Home: _value = _minValue; break;
case Qt::Key_End: _value = _maxValue; break;
case Qt::Key_Up:
case Qt::Key_Left: _value += lineStep(); break;
case Qt::Key_Down:
case Qt::Key_Right: _value -= lineStep(); break;
case Qt::Key_PageDown: _value -= pageStep(); break;
case Qt::Key_PageUp: _value += pageStep(); break;
case Qt::Key_Delete:
case Qt::Key_Backspace: _value = ev->modifiers() & Qt::ShiftModifier ? dclickValue2() : dclickValue1(); break;
default:
break;
}
if (_value < _minValue)
_value = _minValue;
else if (_value > _maxValue)
_value = _maxValue;
if (oval != _value)
valueChange();
}
//---------------------------------------------------------
// mouseDoubleClickEvent
//---------------------------------------------------------
void AbstractSlider::mouseDoubleClickEvent(QMouseEvent* ev)
{
if (ev->button() == Qt::RightButton)
_value = _dclickValue2;
else
_value = _dclickValue1;
valueChange();
}
//---------------------------------------------------------
// setValue
//---------------------------------------------------------
void AbstractSlider::setValue(double val)
{
double oldValue = _value;
if (_log) {
if (val == 0.0f)
_value = _minValue;
else {
_value = fast_log10(val) * 20.0f;
if (_value < _minValue)
_value = _minValue;
}
}
else
_value = val;
if (oldValue != _value)
emit valueChanged(val, __id);
update();
}
//---------------------------------------------------------
// valueChange
//---------------------------------------------------------
void AbstractSlider::valueChange()
{
emit valueChanged(value(), __id);
update();
}
//---------------------------------------------------------
// value
//---------------------------------------------------------
double AbstractSlider::value() const
{
return _log ? pow(10.0, _value*0.05f) : _value;
}
//---------------------------------------------------------
// userValue (between 0 and 100)
//---------------------------------------------------------
QString AbstractSlider::userValue() const
{
double result;
if (_useActualValue)
result = value();
else
result = (_value - minValue())/ ((maxValue() - minValue())/100);
return QString::number(result, 'f', 2);
}
//---------------------------------------------------------
// minLogValue
//---------------------------------------------------------
//double AbstractSlider::minValue() const {
// return _log ? pow(10.0, _minValue*0.05f) : _minValue;
//}
//---------------------------------------------------------
// setMinLogValue
//---------------------------------------------------------
void AbstractSlider::setMinLogValue(double val)
{
if (_log) {
if (val == 0.0f)
_minValue = -100;
else
_minValue = fast_log10(val) * 20.0f;
}
else
_minValue = val;
}
//---------------------------------------------------------
// maxLogValue
//---------------------------------------------------------
//double AbstractSlider::maxValue() const {
// return _log ? pow(10.0, _maxValue*0.05f) : _maxValue;
//}
//---------------------------------------------------------
// setMaxLogValue
//---------------------------------------------------------
void AbstractSlider::setMaxLogValue(double val)
{
if (_log) {
_maxValue = fast_log10(val) * 20.0f;
}
else
_maxValue = val;
}
#if 0
//---------------------------------------------------------
// init
//---------------------------------------------------------
void AbstractSlider::init(const SyntiParameter& f)
{
_minValue = f.min();
_maxValue = f.max();
_value = f.fval();
_lineStep = (_maxValue - _minValue) * 0.1;
_pageStep = _lineStep * 2.0;
}
#endif
AccessibleAbstractSlider::AccessibleAbstractSlider(AbstractSlider* s) : QAccessibleWidget(s)
{
slider = s;
}
QAccessible::Role AccessibleAbstractSlider::role() const
{
return QAccessible::Slider;
}
QString AccessibleAbstractSlider::text(QAccessible::Text t) const
{
switch (t) {
case QAccessible::Name:
return slider->accessibleName();
case QAccessible::Value:
return slider->userValue();
case QAccessible::Description:
return slider->accessibleDescription();
default:
return QString();
}
// Eliminate "unreachable code"
// return QString();
}
void AccessibleAbstractSlider::valueChanged(double, int)
{
QAccessibleValueChangeEvent ev(slider, slider->userValue());
QAccessible::updateAccessibility(&ev);
}
QAccessibleInterface* AccessibleAbstractSlider::AbstractSliderFactory(const QString& /*classname*/, QObject *object)
{
QAccessibleInterface *iface = 0;
if (object && object->isWidgetType() && object->inherits("Awl::AbstractSlider")){
AbstractSlider* slider = static_cast<AbstractSlider*>(object);
AccessibleAbstractSlider* acc = new AccessibleAbstractSlider(slider);
QObject::connect(slider, SIGNAL(valueChanged(double,int)), acc, SLOT(valueChanged(double,int)));
iface = static_cast<QAccessibleInterface*>(acc);
}
return iface;
}
}