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Rivendellaudio/lib/rdslider.cpp
Fred Gleason 698b475933 2016-05-24 Fred Gleason <fredg@paravelsystems.com> 
* Removed all CVS tags.
	* Removed 'const char *name' parameter from all QObject contructors.
2016-05-24 13:13:26 -04:00

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// rdslider.cpp
//
// An audio- and touchscreen-friendly slider widget.
//
// (C) Copyright 2009,2016 Fred Gleason <fredg@paravelsystems.com>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU Library General Public License
// version 2 as published by the Free Software Foundation.
//
// 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 <stdlib.h>
#include <stdio.h>
#include <qwidget.h>
#include <qslider.h>
#include <qpainter.h>
#include <qcolor.h>
#include <qpalette.h>
#include <qsize.h>
#include <qrect.h>
#include <rdslider.h>
#include <qpixmap.h>
RDSlider::RDSlider(QWidget *parent=0)
: QWidget(parent),QRangeControl()
{
init(RDSlider::Right);
update();
}
RDSlider::RDSlider(RDSlider::Orientation orient,QWidget *parent)
: QWidget(parent),QRangeControl()
{
init(orient);
setOrientation(orient);
}
RDSlider::RDSlider(int minValue,int maxValue,int pageStep,int value,
RDSlider::Orientation orient,QWidget *parent)
: QWidget(parent),QRangeControl()
{
init(orient);
setOrientation(orient);
setRange(minValue,maxValue);
setPageStep(pageStep);
setValue(value);
}
RDSlider::Orientation RDSlider::orientation() const
{
return rdslider_orient;
}
void RDSlider::setOrientation(RDSlider::Orientation orient)
{
rdslider_orient=orient;
update();
}
void RDSlider::setTracking(bool enable)
{
tracking_enabled=enable;
}
bool RDSlider::tracking() const
{
return tracking_enabled;
}
void RDSlider::setTickInterval(int i)
{
tick_interval=i;
update();
}
void RDSlider::setTickmarks(QSlider::TickSetting s)
{
tick_setting=s;
update();
}
void RDSlider::setMinValue(int min_value)
{
setRange(min_value,maxValue());
}
void RDSlider::setMaxValue(int max_value)
{
setRange(minValue(),max_value);
}
void RDSlider::setRange(int min_value,int max_value)
{
QRangeControl::setRange(min_value,max_value);
calcKnob();
update(prev_knob);
update(curr_knob);
}
void RDSlider::setLineStep(int step)
{
line_step=step;
}
void RDSlider::setPageStep(int step)
{
page_step=step;
}
void RDSlider::setKnobColor(QColorGroup group)
{
knob_color=group;
calcKnob();
update();
}
void RDSlider::setKnobColor(QColor color)
{
knob_color.setColor(QColorGroup::Background,color);
calcKnob();
update();
}
void RDSlider::setKnobSize(QSize size)
{
if(size!=curr_knob.size()) {
knob_size=size;
calcKnob();
}
}
void RDSlider::setKnobSize(int w,int h)
{
setKnobSize(QSize(w,h));
}
void RDSlider::setGeometry(int x,int y,int w,int h)
{
calcKnob(x,y,w,h);
QWidget::setGeometry(x,y,w,h);
}
void RDSlider::setGeometry(QRect &rect)
{
setGeometry(rect.left(),rect.top(),rect.width(),rect.height());
}
void RDSlider::setValue(int setting)
{
if(!rdslider_moving) {
if(setting!=value()) {
QRangeControl::setValue(setting);
calcKnob();
update(prev_knob);
update(curr_knob);
}
}
}
void RDSlider::addStep()
{
setValue(value()+page_step);
}
void RDSlider::subtractStep()
{
setValue(value()-page_step);
}
void RDSlider::paintEvent(QPaintEvent *paintEvent)
{
QPainter *p=new QPainter(this);
int tick_x,tick_y;
if((rdslider_orient==RDSlider::Up)||(rdslider_orient==RDSlider::Down)) {
//
// The groove
//
p->setPen(QColor(colorGroup().dark()));
p->moveTo(width()/2,knob_size.height()/2);
p->lineTo(width()/2,height()-knob_size.height()/2);
p->setPen(QColor(colorGroup().shadow()));
p->moveTo(width()/2-1,height()-knob_size.height()/2+1);
p->lineTo(width()/2-1,knob_size.height()/2-1);
p->lineTo(width()/2+1,knob_size.height()/2-1);
//
// The ticks
//
switch(rdslider_orient) {
case RDSlider::Up:
if((tick_setting==QSlider::Left)||(tick_setting==QSlider::Both)) {
p->setPen(colorGroup().shadow());
for(int i=minValue();i<=maxValue();i+=tick_interval) {
tick_y=(geometry().height()-curr_knob.height())-
((geometry().height()-curr_knob.height())*(i-minValue()))/
(maxValue()-minValue())+curr_knob.height()/2;
p->moveTo(0,tick_y);
p->lineTo(width()/2-2,tick_y);
}
}
if((tick_setting==QSlider::Right)||(tick_setting==QSlider::Both)) {
p->setPen(colorGroup().shadow());
for(int i=minValue();i<=maxValue();i+=tick_interval) {
tick_y=(geometry().height()-curr_knob.height())-
((geometry().height()-curr_knob.height())*(i-minValue()))/
(maxValue()-minValue())+curr_knob.height()/2;
p->moveTo(width()/2+2,tick_y);
p->lineTo(width(),tick_y);
}
}
break;
case RDSlider::Down:
if((tick_setting==QSlider::Left)||(tick_setting==QSlider::Both)) {
p->setPen(colorGroup().shadow());
for(int i=minValue();i<=maxValue();i+=tick_interval) {
tick_y=(geometry().height()-curr_knob.height()/2)-
abs((geometry().height()-curr_knob.height())*i)/
(maxValue()-minValue());
p->moveTo(0,tick_y);
p->lineTo(width()/2-2,tick_y);
}
}
if((tick_setting==QSlider::Right)||(tick_setting==QSlider::Both)) {
p->setPen(colorGroup().shadow());
for(int i=minValue();i<=maxValue();i+=tick_interval) {
tick_y=(geometry().height()-curr_knob.height()/2)-
abs((geometry().height()-curr_knob.height())*i)/
(maxValue()-minValue());
p->moveTo(width()/2+2,tick_y);
p->lineTo(width(),tick_y);
}
}
break;
default:
break;
}
}
if((rdslider_orient==RDSlider::Left)||(rdslider_orient==RDSlider::Right)) {
//
// The groove
//
p->setPen(QColor(colorGroup().light()));
p->moveTo(knob_size.width()/2,height()/2+1);
p->lineTo(width()-knob_size.width()/2,height()/2+1);
p->setPen(QColor(colorGroup().dark()));
p->moveTo(knob_size.width()/2,height()/2);
p->lineTo(width()-knob_size.width()/2,height()/2);
p->setPen(QColor(colorGroup().shadow()));
p->moveTo(width()-knob_size.width()/2+1,height()/2-1);
p->lineTo(knob_size.width()/2-1,height()/2-1);
//
// The ticks
//
switch(rdslider_orient) {
case RDSlider::Left:
if((tick_setting==QSlider::Above)||(tick_setting==QSlider::Both)) {
p->setPen(colorGroup().shadow());
for(int i=minValue();i<=maxValue();i+=tick_interval) {
tick_x=(geometry().width()-curr_knob.width())-
((geometry().width()-curr_knob.width())*(i-minValue()))/
(maxValue()-minValue())+curr_knob.width()/2;
p->moveTo(tick_x,0);
p->lineTo(tick_x,height()/2-2);
}
}
if((tick_setting==QSlider::Below)||(tick_setting==QSlider::Both)) {
p->setPen(colorGroup().shadow());
for(int i=minValue();i<=maxValue();i+=tick_interval) {
tick_x=(geometry().width()-curr_knob.width())-
((geometry().width()-curr_knob.width())*(i-minValue()))/
(maxValue()-minValue())+curr_knob.width()/2;
p->moveTo(tick_x,height()/2+2);
p->lineTo(tick_x,height());
}
}
break;
case RDSlider::Right:
if((tick_setting==QSlider::Above)||(tick_setting==QSlider::Both)) {
p->setPen(colorGroup().shadow());
for(int i=minValue();i<=maxValue();i+=tick_interval) {
tick_x=(geometry().width()-curr_knob.width()/2)-
abs((geometry().width()-curr_knob.width())*i)/
(maxValue()-minValue());
p->moveTo(tick_x,0);
p->lineTo(tick_x,height()/2-2);
}
}
if((tick_setting==QSlider::Below)||(tick_setting==QSlider::Both)) {
p->setPen(colorGroup().shadow());
for(int i=minValue();i<=maxValue();i+=tick_interval) {
tick_x=(geometry().width()-curr_knob.width()/2)-
abs((geometry().width()-curr_knob.width())*i)/
(maxValue()-minValue());
p->moveTo(tick_x,height()/2+2);
p->lineTo(tick_x,height());
}
}
break;
default:
break;
}
}
//
// The knob
//
p->drawPixmap(curr_knob.x(),curr_knob.y(),*knob_map);
p->end();
}
void RDSlider::mouseMoveEvent(QMouseEvent *mouse)
{
int curr_x,curr_y;
int knob_value;
if(rdslider_moving) {
prev_knob=curr_knob;
if((rdslider_orient==RDSlider::Up)||(rdslider_orient==RDSlider::Down)) {
if(mouse->y()<0) {
curr_knob=QRect(curr_knob.x(),0,curr_knob.width(),curr_knob.height());
if(prev_knob!=curr_knob) {
switch(rdslider_orient) {
case RDSlider::Up:
if(value()!=maxValue()) {
QRangeControl::setValue(maxValue());
if(tracking_enabled) {
emit valueChanged(value());
}
else {
deferred_change=true;
}
}
break;
case RDSlider::Down:
if(value()!=minValue()) {
QRangeControl::setValue(minValue());
if(tracking_enabled) {
emit valueChanged(value());
}
else {
deferred_change=true;
}
}
break;
default:
break;
}
emit sliderMoved(value());
update(prev_knob);
update(curr_knob);
}
return;
}
if(mouse->y()>geometry().height()) {
curr_knob=QRect(curr_knob.x(),height()-curr_knob.height(),
curr_knob.width(),curr_knob.height());
if(prev_knob!=curr_knob) {
switch(rdslider_orient) {
case RDSlider::Up:
if(value()!=minValue()) {
QRangeControl::setValue(minValue());
if(tracking_enabled) {
emit valueChanged(value());
}
else {
deferred_change=true;
}
}
break;
case RDSlider::Down:
if(value()!=maxValue()) {
QRangeControl::setValue(maxValue());
if(tracking_enabled) {
emit valueChanged(value());
}
else {
deferred_change=true;
}
}
break;
default:
break;
}
emit sliderMoved(value());
update(prev_knob);
update(curr_knob);
}
return;
}
curr_y=curr_knob.y()-base_y+mouse->y();
if(curr_y<0) {
curr_y=0;
}
if(curr_y>(height()-curr_knob.height())) {
curr_y=height()-curr_knob.height();
}
curr_knob=QRect(curr_knob.x(),curr_y,
curr_knob.width(),curr_knob.height());
base_y=mouse->y();
switch(rdslider_orient) {
case RDSlider::Up:
knob_value=(maxValue()-minValue())*
(geometry().height()-curr_knob.y()
-curr_knob.height())/
(geometry().height()-curr_knob.height())
+minValue();
if(value()!=knob_value) {
QRangeControl::setValue(knob_value);
if(tracking_enabled) {
emit valueChanged(value());
}
else {
deferred_change=true;
}
}
break;
case RDSlider::Down:
knob_value=((minValue()-maxValue())*
curr_knob.y()
+curr_knob.height()-geometry().height())/
(curr_knob.height()-geometry().height())
+minValue();
if(value()!=knob_value) {
QRangeControl::setValue(knob_value);
if(tracking_enabled) {
emit valueChanged(value());
}
else {
deferred_change=true;
}
}
break;
default:
break;
}
emit sliderMoved(value());
update(prev_knob);
update(curr_knob);
}
if((rdslider_orient==RDSlider::Left)||(rdslider_orient==RDSlider::Right)) {
if(mouse->x()<0) {
curr_knob=QRect(0,curr_knob.y(),curr_knob.width(),curr_knob.height());
if(prev_knob!=curr_knob) {
switch(rdslider_orient) {
case RDSlider::Left:
if(value()!=maxValue()) {
QRangeControl::setValue(maxValue());
if(tracking_enabled) {
emit valueChanged(value());
}
else {
deferred_change=true;
}
}
break;
case RDSlider::Right:
if(value()!=minValue()) {
QRangeControl::setValue(minValue());
if(tracking_enabled) {
emit valueChanged(value());
}
else {
deferred_change=true;
}
}
break;
default:
break;
}
emit sliderMoved(value());
update(prev_knob);
update(curr_knob);
}
return;
}
if(mouse->x()>geometry().width()) {
curr_knob=QRect(width()-curr_knob.width(),curr_knob.y(),
curr_knob.width(),curr_knob.height());
if(prev_knob!=curr_knob) {
switch(rdslider_orient) {
case RDSlider::Left:
if(value()!=minValue()) {
QRangeControl::setValue(minValue());
if(tracking_enabled) {
emit valueChanged(value());
}
else {
deferred_change=true;
}
}
break;
case RDSlider::Right:
if(value()!=maxValue()) {
QRangeControl::setValue(maxValue());
if(tracking_enabled) {
emit valueChanged(value());
}
else {
deferred_change=true;
}
}
break;
default:
break;
}
emit sliderMoved(value());
update(prev_knob);
update(curr_knob);
}
return;
}
curr_x=curr_knob.x()-base_x+mouse->x();
if(curr_x<0) {
curr_x=0;
}
if(curr_x>(width()-curr_knob.width())) {
curr_x=width()-curr_knob.width();
}
curr_knob=QRect(curr_x,curr_knob.y(),
curr_knob.width(),curr_knob.height());
base_x=mouse->x();
switch(rdslider_orient) {
case RDSlider::Left:
knob_value=(maxValue()-minValue())*
(geometry().width()-curr_knob.x()
-curr_knob.width())/
(geometry().width()-curr_knob.width())
+minValue();
if(value()!=knob_value) {
QRangeControl::setValue(knob_value);
if(tracking_enabled) {
emit valueChanged(value());
}
else {
deferred_change=true;
}
}
break;
case RDSlider::Right:
knob_value=((minValue()-maxValue())*curr_knob.x()
+curr_knob.width()-geometry().width())/
(curr_knob.width()-geometry().width())
+minValue();
if(value()!=knob_value) {
QRangeControl::setValue(knob_value);
if(tracking_enabled) {
emit valueChanged(value());
}
else {
deferred_change=true;
}
}
break;
default:
break;
}
emit sliderMoved(value());
update(prev_knob);
update(curr_knob);
}
}
}
void RDSlider::mousePressEvent(QMouseEvent *mouse)
{
if(mouse->button()==QMouseEvent::LeftButton) {
if(curr_knob.contains(mouse->x(),mouse->y())) {
base_x=mouse->x();
base_y=mouse->y();
rdslider_moving=true;
emit sliderPressed();
return;
}
if(page_up.contains(mouse->x(),mouse->y())) {
addStep();
return;
}
if(page_down.contains(mouse->x(),mouse->y())) {
subtractStep();
}
}
else {
QWidget::mousePressEvent(mouse);
}
}
void RDSlider::mouseReleaseEvent(QMouseEvent *mouse)
{
if(mouse->button()==QMouseEvent::LeftButton) {
rdslider_moving=false;
if(deferred_change) {
emit valueChanged(value());
deferred_change=false;
}
emit sliderReleased();
}
}
void RDSlider::init(RDSlider::Orientation orient)
{
rdslider_orient=orient;
knob_map=NULL;
knob_color=colorGroup();
rdslider_moving=false;
page_step=10;
line_step=1;
tracking_enabled=true;
deferred_change=false;
tick_interval=10;
tick_setting=QSlider::NoMarks;
setRange(0,100);
knob_size=QSize(geometry().width(),10);
}
void RDSlider::calcKnob()
{
calcKnob(geometry().x(),geometry().y(),
geometry().width(),geometry().height());
}
void RDSlider::calcKnob(int x,int y,int w,int h)
{
int knob_x=0;
int knob_y=0;
int knob_w=0;
int knob_h=0;
QPainter p;
if((rdslider_orient==RDSlider::Up)||(rdslider_orient==RDSlider::Down)) {
//
// The knob itself
//
knob_w=knob_size.width();
knob_h=knob_size.height();
knob_x=w/2-knob_w/2;
switch(rdslider_orient) {
case RDSlider::Up:
knob_y=(h-knob_h)-((h-knob_h)*(value()-minValue()))/
(maxValue()-minValue());
break;
case RDSlider::Down:
knob_y=-(h-knob_h-((h-knob_h)*(value()-minValue())))/
(maxValue()-minValue());
break;
default:
break;
}
prev_knob=curr_knob;
if((knob_w>0)&&(knob_h>0)) {
curr_knob=QRect(knob_x,knob_y,knob_w,knob_h);
}
else {
curr_knob=QRect(knob_x,knob_y,1,1);
}
if(prev_knob!=curr_knob) {
emit sliderMoved(value());
}
//
// The PageUp/PageDown areas
//
if(rdslider_orient==RDSlider::Up) {
page_up=QRect(knob_x,0,knob_w,knob_y);
page_down=QRect(knob_x,knob_y+knob_h,knob_w,height()-(knob_y+knob_h));
}
if(rdslider_orient==RDSlider::Down) {
page_down=QRect(knob_x,0,knob_w,knob_y);
page_up=QRect(knob_x,knob_y+knob_h,knob_w,height()-(knob_y+knob_h));
}
//
// The knob cap
//
if(knob_map!=NULL) {
delete knob_map;
}
knob_map=new QPixmap(curr_knob.size());
knob_map->fill(knob_color.background());
p.begin(knob_map);
//
// The outline
//
p.setPen(knob_color.light());
p.moveTo(0,curr_knob.height()-1);
p.lineTo(0,0);
p.lineTo(curr_knob.width()-1,0);
p.moveTo(1,curr_knob.height()-1);
p.lineTo(1,1);
p.lineTo(curr_knob.width()-1,1);
p.setPen(knob_color.dark());
p.lineTo(curr_knob.width()-1,curr_knob.height()-1);
p.lineTo(0,curr_knob.height()-1);
p.moveTo(curr_knob.width()-2,1);
p.lineTo(curr_knob.width()-2,curr_knob.height()-2);
p.lineTo(0,curr_knob.height()-2);
//
// The centerline
//
if(curr_knob.height()>=40) {
p.setPen(knob_color.dark());
p.moveTo(2,curr_knob.height()/2);
p.lineTo(curr_knob.width()-2,curr_knob.height()/2);
p.setPen(knob_color.shadow());
p.moveTo(2,curr_knob.height()/2-1);
p.lineTo(curr_knob.width()-2,curr_knob.height()/2-1);
p.setPen(knob_color.light());
p.moveTo(2,curr_knob.height()/2+1);
p.lineTo(curr_knob.width()-2,curr_knob.height()/2+1);
}
p.end();
}
if((rdslider_orient==RDSlider::Left)||(rdslider_orient==RDSlider::Right)) {
//
// The knob itself
//
knob_w=knob_size.width();
knob_h=knob_size.height();
knob_y=h/2-knob_h/2;
switch(rdslider_orient) {
case RDSlider::Left:
knob_x=(w-knob_w)-((w-knob_w)*(value()-minValue()))/
(maxValue()-minValue());
break;
case RDSlider::Right:
knob_x=-(w-knob_w-((w-knob_w)*(value()-minValue())))/
(maxValue()-minValue());
break;
default:
break;
}
prev_knob=curr_knob;
if((knob_w>0)&&(knob_h>0)) {
curr_knob=QRect(knob_x,knob_y,knob_w,knob_h);
}
else {
curr_knob=QRect(knob_x,knob_y,1,1);
}
//
// The PageUp/PageDown areas
//
if(rdslider_orient==RDSlider::Right) {
page_up=QRect(knob_x+knob_w,knob_y,x+w,knob_h);
page_down=QRect(0,knob_y,knob_x,knob_y+knob_h);
}
if(rdslider_orient==RDSlider::Left) {
page_down=QRect(knob_x+knob_w,knob_y,x+w,knob_h);
page_up=QRect(0,knob_y,knob_x,knob_y+knob_h);
}
//
// The knob cap
//
if(knob_map!=NULL) {
delete knob_map;
}
knob_map=new QPixmap(curr_knob.size());
knob_map->fill(knob_color.background());
p.begin(knob_map);
//
// The outline
//
p.setPen(knob_color.light());
p.moveTo(0,curr_knob.height()-1);
p.lineTo(0,0);
p.lineTo(curr_knob.width()-1,0);
p.moveTo(1,curr_knob.height()-1);
p.lineTo(1,1);
p.lineTo(curr_knob.width()-1,1);
p.setPen(knob_color.dark());
p.lineTo(curr_knob.width()-1,curr_knob.height()-1);
p.lineTo(0,curr_knob.height()-1);
p.moveTo(curr_knob.width()-2,1);
p.lineTo(curr_knob.width()-2,curr_knob.height()-2);
p.lineTo(0,curr_knob.height()-2);
//
// The centerline
//
if(curr_knob.width()>=40) {
p.setPen(knob_color.dark());
p.moveTo(curr_knob.width()/2,2);
p.lineTo(curr_knob.width()/2,curr_knob.height()-2);
p.setPen(knob_color.shadow());
p.moveTo(curr_knob.width()/2-1,2);
p.lineTo(curr_knob.width()/2-1,curr_knob.height()-2);
p.setPen(knob_color.light());
p.moveTo(curr_knob.width()/2+1,2);
p.lineTo(curr_knob.width()/2+1,curr_knob.height()-2);
}
p.end();
}
}
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