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#include <cstring>
#include <QPainter>
#include "qmppianowidget.hpp"
qmpPianoWidget::qmpPianoWidget(QWidget *parent) : QWidget(parent)
{
memset(keystates,0,sizeof(keystates));
QPalette p=palette();
p.setColor(QPalette::ColorRole::Highlight,0xff66cc);
p.setColor(QPalette::ColorRole::Base,0x66ccff);
setPalette(p);
}
void qmpPianoWidget::setKeyState(int key,bool state)
{
keystates[key]=state;
update();
}
void qmpPianoWidget::reset()
{
memset(keystates,0,sizeof(keystates));
update();
}
QSize qmpPianoWidget::minimumSizeHint()const
{
return QSize(320,22);
}
bool qmpPianoWidget::hasHeightForWidth()const
{
return true;
}
int qmpPianoWidget::heightForWidth(int w)const
{
return w*22/320;
}
void qmpPianoWidget::paintEvent(QPaintEvent *event)
{
Q_UNUSED(event)
for(int i=0;i<128;++i)
{
QRectF r=getKeyRect(i);
QColor activeColor=palette().color(QPalette::ColorRole::Highlight);
QColor inactiveColor=palette().color(QPalette::ColorRole::Base);
if(i/12%2)
{
if(inactiveColor.valueF()>0.5)
inactiveColor=inactiveColor.darker(112);
else
inactiveColor=inactiveColor.lighter(112);
}
paintKey(r,keystates[i]?activeColor:inactiveColor);
}
}
QRectF qmpPianoWidget::getKeyRect(int key)
{
int octave=key/12;key%=12;
bool is_black=(key<5&&(key&1))||(key>5&&((key&1)^1));
double key_width=width()/75.;
QRectF ret(0,0,key_width,height()/2.);
if(!is_black)
{
ret.moveTop(height()/2.);
int shift=(key+(key>=5))>>1;
ret.moveLeft((octave*7+shift)*key_width);
}
else
ret.moveLeft((octave*7+(key+(key>=5))/2.)*key_width);
return ret;
}
void qmpPianoWidget::paintKey(QRectF keyrect,QColor keycolor)
{
QColor bordercolor(keycolor);
if(keycolor.valueF()>0.5)
bordercolor=bordercolor.darker(150);
else
bordercolor=bordercolor.lighter(150);
QPainter *p=new QPainter(this);
p->setPen(bordercolor);
p->setBrush(QBrush(keycolor));
p->drawRect(keyrect.adjusted(1,1,-1,-1));
delete p;
}
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