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//===========================================
// Lumina-DE source code
// Copyright (c) 2015, Ken Moore
// Available under the 3-clause BSD license
// See the LICENSE file for full details
//===========================================
// This is a simple subclass for a QToolButton with black/white text (for transparent backgrounds)
//===========================================
#ifndef _LUMINA_DESKTOP_PLUGIN_APPLAUNCHER_OUTLINE_TOOLBUTTON_H
#define _LUMINA_DESKTOP_PLUGIN_APPLAUNCHER_OUTLINE_TOOLBUTTON_H
#include <QToolButton>
#include <QPainter>
#include <QPainterPath>
#include <QPen>
#include <QStyle>
#include <QStyleOption>
#include <QStylePainter>
#include <QFont>
#include <QDebug>
#include <QMouseEvent>
class OutlineToolButton : public QToolButton{
Q_OBJECT
public:
OutlineToolButton(QWidget *parent=0) : QToolButton(parent){
//This button needs slightly different font settings - do this in the constructor so that other widgets can take it into account.
QFont font = this->font();
font.setStyleStrategy(QFont::PreferAntialias); //Always set the font strategy (just in case it starts working down the road)
this->setFont(font);
this->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
}
~OutlineToolButton(){}
signals:
void DoubleClicked();
protected:
void mouseDoubleClickEvent(QMouseEvent *ev){
ev->accept();
emit DoubleClicked();
}
void mousePressEvent(QMouseEvent *ev){
ev->ignore();
}
void mouseReleaseEvent(QMouseEvent *ev){
ev->ignore();
}
void paintEvent(QPaintEvent*){
/* NOTE: This is what a standard QToolButton performs (peeked at Qt source code for this tidbit)
QStylePainter p(this);
QStyleOptionToolButton opt;
initStyleOption(&opt);
p.drawComplexControl(QStyle::CC_ToolButton, opt);
*/
//Modify the standard QToolButton routine to paint the text differently
QStylePainter p(this);
QStyleOptionToolButton opt;
initStyleOption(&opt);
opt.font = this->property("font").value<QFont>(); //This ensures that the stylesheet values are incorporated
opt.font.setStyleStrategy(QFont::PreferAntialias); //Always set the font strategy (just in case it starts working down the road)
opt.font.setKerning(true);
opt.fontMetrics = QFontMetrics(opt.font);
opt.text.clear(); //Don't paint the text yet - just the background/icon
p.drawComplexControl(QStyle::CC_ToolButton, opt); //This does all the normal QToolButton stuff - just not text
//Now get the text rectangle for the widget
QRect box = p.style()->itemTextRect(opt.fontMetrics, opt.rect, Qt::AlignHCenter | Qt::AlignBottom, true, this->text());
//Get the QColors for the outline/text
QColor textC = opt.palette.text().color().toHsl(); //need the lightness value in a moment
QColor outC = textC;
//qDebug() << "Font Color Values:" << textC << textC.lightness() << textC.lightnessF();
if(textC.lightnessF() > 0.5){ outC.setHsl(textC.hue(), textC.hslSaturation(), 0, 90); }
else{outC.setHsl(textC.hue(), textC.hslSaturation(), 255, 50); }
//qDebug() << "Outline Color Values:" << outC;
//Now get the size of the outline border (need to scale for high-res monitors)
qreal OWidth = opt.fontMetrics.horizontalAdvance("o")/2.0;
//qDebug() << "Outline Width:" << OWidth;
//Now generate a QPainterPath for the text
QPainterPath path;
QStringList txt = this->text().split("\n"); //need each line independently, the newline actually gets painted otherwise
for(int i=0; i<txt.length(); i++){
path.addText(box.center().x() - (opt.fontMetrics.horizontalAdvance(txt[i])/2), box.y()+((i+1)*(box.height()/txt.length()))-opt.fontMetrics.descent(), opt.font, txt[i] );
}
path.setFillRule(Qt::WindingFill);
//Now paint the text
QRadialGradient RG(box.center(), box.width()*1.5); //width is always going to be greater than height
RG.setColorAt(0, outC);
RG.setColorAt(1, Qt::transparent);
p.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing); //need antialiasing for this to work well (sub-pixel painting)
p.strokePath(path, QPen(QBrush(RG),OWidth, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin) ); //This will be the outline - 1pixel thick, semi-transparent
p.fillPath(path, QBrush(textC)); //this will be the inside/text color
}
};
#endif
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