#include <src/ckb/gradientdialogwidget.h>

Inheritance diagram for GradientDialogWidget:

Collaboration diagram for GradientDialogWidget:

Signals
void	currentChanged (QColor color, bool spontaneous, int position)

Public Member Functions
	GradientDialogWidget (QWidget *parent=0)

void	setStops (const QGradientStops &stops)

QGradientStops	stops ()

int	stopCount ()

QColor	colorAt (int position)

int	current ()

int	moveCurrent (int to)

void	setCurrentColor (const QColor &color)

Private Member Functions
QRect	fillRect ()

QRect	stopRect (int pos)

int	selectedStop ()

QMap< int, QColor >	selectionColors ()

void	makeStops ()

void	paintEvent (QPaintEvent *)

void	mousePressEvent (QMouseEvent *event)

void	mouseMoveEvent (QMouseEvent *event)

void	mouseReleaseEvent (QMouseEvent *event)

Private Attributes
QColor	selected

int	selectedPos

int	selectedOffset

int	_current

QMap< int, QColor >	_colors

QGradientStops	_stops

Detailed Description

Definition at line 8 of file gradientdialogwidget.h.

Constructor & Destructor Documentation

GradientDialogWidget::GradientDialogWidget ( QWidget * parent = 0 )

explicit

Definition at line 6 of file gradientdialogwidget.cpp.

                                                           :
     QWidget(parent), selectedPos(-1), _current(-1)
 {
     setMouseTracking(true);
 }

Member Function Documentation

QColor GradientDialogWidget::colorAt ( int position )

Definition at line 65 of file gradientdialogwidget.cpp.

References _stops.

Referenced by mousePressEvent().

                                                 {
     // Find which stops the position is between
     qreal pos = position / 100.;
     QVectorIterator<QGradientStop> i(_stops);
     QGradientStop previous = i.next();
     while(i.hasNext()){
         QGradientStop next = i.next();
         if(next.first >= pos){
             // Get color by linear interpolation. Premultiply the alpha value so that it returns the expected color
             // (i.e. stops with zero opacity won't contribute to color)
             QColor c1 = next.second, c2 = previous.second;
             qreal distance = next.first - previous.first;
             qreal dx = (pos - previous.first) / distance;
             qreal a1 = c1.alphaF(), a2 = c2.alphaF();
             qreal a3 = a1 * dx + a2 * (1.f - dx);
             if(a3 == 0.){
                 c2.setAlpha(0);
                 return c2;
             }
             qreal r = (c1.redF() * a1 * dx + c2.redF() * a2 * (1.f - dx)) / a3;
             qreal g = (c1.greenF() * a1 * dx + c2.greenF() * a2 * (1.f - dx)) / a3;
             qreal b = (c1.blueF() * a1 * dx + c2.blueF() * a2 * (1.f - dx)) / a3;
             return QColor::fromRgbF(r, g, b, a3);
         }
         previous = next;
     }
     return QColor();
 }

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int GradientDialogWidget::current ( )

inline

Definition at line 20 of file gradientdialogwidget.h.

References _current.

20 { return _current; }

GradientDialogWidget::_current

int _current

Definition: gradientdialogwidget.h:30

void GradientDialogWidget::currentChanged	(	QColor	color,
		bool	spontaneous,
		int	position
	)

signal

Definition at line 126 of file moc_gradientdialogwidget.cpp.

Referenced by mouseReleaseEvent(), and setStops().

 {
     void *_a[] = { Q_NULLPTR, const_cast<void*>(reinterpret_cast<const void*>(&_t1)), const_cast<void*>(reinterpret_cast<const void*>(&_t2)), const_cast<void*>(reinterpret_cast<const void*>(&_t3)) };
     QMetaObject::activate(this, &staticMetaObject, 0, _a);
 }

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QRect GradientDialogWidget::fillRect ( )

private

Definition at line 138 of file gradientdialogwidget.cpp.

References width, x, and y.

Referenced by mouseMoveEvent(), mousePressEvent(), paintEvent(), selectedStop(), and stopRect().

                                     {
     int x = 8, y = 1;
     int w = (width() - x * 2) / 16 * 16, h = (height() - 24) / 16 * 16;
     return QRect(x, y, w, h);
 }

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void GradientDialogWidget::makeStops ( )

private

Definition at line 30 of file gradientdialogwidget.cpp.

References _stops, and selectionColors().

Referenced by mouseMoveEvent(), mousePressEvent(), mouseReleaseEvent(), moveCurrent(), and setCurrentColor().

                                     {
     _stops.clear();
     QMap<int, QColor> colors = selectionColors();
     // If there's only a single color, put it at the beginning and end
     if(colors.count() == 1){
 #if QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
         QColor color = colors.first();
 #else
         QColor color = colors.value(colors.keys().first());
 #endif
         _stops.append(QGradientStop(0., color));
         _stops.append(QGradientStop(1., color));
         update();
         return;
     }
     // Add colors at 0 and 100 if needed
 #if QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
     if(!colors.contains(0))
         colors[0] = colors.first();
     if(!colors.contains(100))
         colors[100] = colors.last();
 #else
     if(!colors.contains(0))
         colors[0] = colors.value(colors.keys().first());
     if(!colors.contains(100))
         colors[100] = colors.value(colors.keys().last());
 #endif
     QMapIterator<int, QColor> i(colors);
     while(i.hasNext()){
         i.next();
         _stops.append(QGradientStop(i.key() / 100., i.value()));
     }
     update();
 }

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void GradientDialogWidget::mouseMoveEvent ( QMouseEvent * event )

private

Definition at line 255 of file gradientdialogwidget.cpp.

References _colors, fillRect(), left, makeStops(), right(), selected, selectedOffset, selectedPos, and top.

                                                            {
     if(!selected.isValid()){
         if(event->y() >= height() - 24)
             setCursor(QCursor(Qt::PointingHandCursor));
         else
             setCursor(QCursor(Qt::ArrowCursor));
         return;
     }
     // Move selected point (if any)
     setCursor(QCursor(Qt::ClosedHandCursor));
     selectedPos = event->x() + selectedOffset;
     // Allow the point to be deleted as long as there is at least 1 other point
     bool last = (_colors.count() == 0);
     // Hug the left/right edges
     QRect rect = fillRect();
     int left = rect.left(), right = rect.right();
     if(selectedPos < left && (last || selectedPos >= left - 30))
         selectedPos = left;
     else if(selectedPos > right && (last || selectedPos <= right + 30))
         selectedPos = right;
     // Remove point if it's too far above/below the widget
     int top = -30, bottom = height() + 30;
     if(!last && (event->y() < top || event->y() > bottom))
         selectedPos = -1;
     makeStops();
 }

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void GradientDialogWidget::mousePressEvent ( QMouseEvent * event )

private

Definition at line 222 of file gradientdialogwidget.cpp.

References _colors, colorAt(), fillRect(), makeStops(), mouseReleaseEvent(), selected, selectedOffset, selectedPos, selectedStop(), stopRect(), x, and y.

                                                             {
     int x = event->x(), y = event->y();
     if(y < height() - 24)
         return;
     QMapIterator<int, QColor> i(_colors);
     while(i.hasNext()){
         i.next();
         // If a point was selected, remove it from the color map and set it as the selected point
         QRect stop = stopRect(i.key());
         if(x >= stop.left() - 1 && x <= stop.right() + 1){
             selected = i.value();
             selectedPos = stop.x() + stop.width() / 2;
             selectedOffset = selectedPos - x;
             _colors.remove(i.key());
             // On right click, delete the point
             if(event->button() == Qt::RightButton && _colors.count() > 1){
                 selectedPos = -1;
                 mouseReleaseEvent(event);
             } else
                 update();
             return;
         }
     }
     // If nothing was selected, create a new point
     QRect fill = fillRect();
     if(x > fill.left() && x < fill.right() && event->button() != Qt::RightButton){
         selectedPos = x;
         selectedOffset = 0;
         selected = colorAt(selectedStop());
         makeStops();
     }
 }

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void GradientDialogWidget::mouseReleaseEvent ( QMouseEvent * event )

private

Definition at line 282 of file gradientdialogwidget.cpp.

References _colors, _current, currentChanged(), makeStops(), selected, selectedPos, selectedStop(), and selectionColors().

Referenced by mousePressEvent().

                                                               {
     if(selected.isValid()){
         // Rejoin selection with gradient
         _current = selectedStop();
         _colors = selectionColors();
         emit currentChanged(_colors.value(_current), true, _current);
         selectedPos = -1;
         selected = QColor();
         makeStops();
     }
     if(event->y() >= height() - 24)
         setCursor(QCursor(Qt::PointingHandCursor));
     else
         setCursor(QCursor(Qt::ArrowCursor));
 }

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int GradientDialogWidget::moveCurrent ( int to )

Definition at line 94 of file gradientdialogwidget.cpp.

References _colors, _current, makeStops(), and selected.

Referenced by GradientDialog::on_stopPos_valueChanged().

                                            {
     if(_current < 0 || to == _current || selected.isValid())
         return _current;
     // If there's a point in the way, skip past it by continuing in the current direction
     if(_current < to){
         while(_colors.contains(to)){
             to++;
             if(to > 100)
                 return _current;
         }
     } else {
         while(_colors.contains(to)){
             to--;
             if(to < 0)
                 return _current;
         }
     }
     _colors[to] = _colors.take(_current);
     _current = to;
     makeStops();
     return to;
 }

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void GradientDialogWidget::paintEvent ( QPaintEvent * )

private

Definition at line 172 of file gradientdialogwidget.cpp.

References _colors, _current, _stops, fillRect(), selected, selectedPos, stopRect(), x, and y.

                                                  {
     QPainter painter(this);
     QRect fill = fillRect();
     int x = fill.x(), y = fill.y(), w = fill.width(), h = fill.height();
 
     // Draw border around gradient
     painter.setPen(palette().color(QPalette::Dark));
     painter.drawLine(x - 1, y - 1, x + w, y - 1);
     painter.drawLine(x - 1, y - 1, x - 1, y + h);
     painter.setPen(palette().color(QPalette::Light));
     painter.drawLine(x - 1, y + h, x + w, y + h);
     painter.drawLine(x + w, y - 1, x + w, y + h);
     // Draw background grid
     for(int i = 0; i < w; i += 16){
         for(int iy = 0; iy < h; iy += 16){
             if(i % 32 != iy % 32)
                 painter.fillRect(x + i, y + iy, 16, 16, QColor(192, 192, 192));
             else
                 painter.fillRect(x + i, y + iy, 16, 16, QColor(255, 255, 255));
         }
     }
     // Draw gradient
     painter.setRenderHint(QPainter::Antialiasing);
     QLinearGradient gradient(x, 0, x + w, 0);
     gradient.setStops(_stops);
     painter.fillRect(fill, QBrush(gradient));
 
     // Draw stops
     QMapIterator<int, QColor> i(_colors);
     painter.setPen(palette().color(QPalette::Shadow));
     while(i.hasNext()){
         i.next();
         painter.setBrush(QBrush(i.value()));
         int index = i.key();
         if(index == _current){
             // Highlight currently-edited stop
             painter.setPen(QPen(palette().color(QPalette::Highlight), 2));
             painter.drawRoundedRect(stopRect(index), 4, 4);
             painter.setPen(palette().color(QPalette::Shadow));
         } else
             painter.drawRoundedRect(stopRect(index), 4, 4);
     }
     // Draw selection (if any)
     if(selected.isValid() && selectedPos >= x && selectedPos <= x + w){
         painter.setPen(QPen(palette().color(QPalette::Highlight), 2.5));
         painter.setBrush(selected);
         painter.drawRoundedRect(selectedPos - 6, height() - 18 - 2, 12, 18, 4, 4);
     }
 }

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int GradientDialogWidget::selectedStop ( )

private

Definition at line 152 of file gradientdialogwidget.cpp.

References fillRect(), and selectedPos.

Referenced by mousePressEvent(), mouseReleaseEvent(), and selectionColors().

                                       {
     QRect rect = fillRect();
     int res = round((selectedPos - rect.x()) * 100. / rect.width());
     if(res < 0 || res > 100)
         return -1;
     return res;
 }

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QMap< int, QColor > GradientDialogWidget::selectionColors ( )

private

Definition at line 160 of file gradientdialogwidget.cpp.

References _colors, selected, and selectedStop().

Referenced by makeStops(), and mouseReleaseEvent().

                                                        {
     if(!selected.isValid())
         return _colors;
     // Determine selected stop position
     int selPos = selectedStop();
     // Re-add if in range
     QMap<int, QColor> res = _colors;
     if(selPos >= 0 && selPos <= 100)
         res[selPos] = selected;
     return res;
 }

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void GradientDialogWidget::setCurrentColor ( const QColor & color )

Definition at line 117 of file gradientdialogwidget.cpp.

References _colors, _current, makeStops(), and selected.

Referenced by GradientDialog::colorChanged().

                                                              {
     if(_current < 0 || selected.isValid())
         return;
     QRgb rgb = _colors.value(_current).rgb();
     _colors[_current] = color;
     // If any points follow with the same color but different opacity, change them to match
     QMutableMapIterator<int, QColor> i(_colors);
     while(i.hasNext()){
         i.next();
         if(i.key() <= _current)
             continue;
         QColor& value = i.value();
         if(value.rgb() != rgb)
             break;
         int alpha = value.alpha();
         value = color;
         value.setAlpha(alpha);
     }
     makeStops();
 }

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void GradientDialogWidget::setStops ( const QGradientStops & stops )

Definition at line 12 of file gradientdialogwidget.cpp.

References _colors, _current, _stops, currentChanged(), and stops().

Referenced by GradientDialog::getGradient(), and GradientDialog::setPreset().

                                                               {
     _stops = stops;
     _colors.clear();
     foreach(const QGradientStop& stop, stops){
         double pos = stop.first;
         if(pos < 0. || pos > 1.)
             continue;
         _colors[round(pos * 100.)] = stop.second;
     }
     _current = 0;
 #if QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
     emit currentChanged(_colors.first(), false, 0);
 #else
     emit currentChanged(_colors.value(_colors.keys().first()), false, 0);
 #endif
     update();
 }

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int GradientDialogWidget::stopCount ( )

inline

Definition at line 16 of file gradientdialogwidget.h.

References _stops.

Referenced by GradientDialog::currentChanged().

16 { return _stops.count(); }

GradientDialogWidget::_stops

QGradientStops _stops

Definition: gradientdialogwidget.h:32

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QRect GradientDialogWidget::stopRect ( int pos )

private

Definition at line 144 of file gradientdialogwidget.cpp.

References fillRect().

Referenced by mousePressEvent(), and paintEvent().

                                            {
     QRect fill = fillRect();
     int sx = round(pos / 100. * fill.width()) + fill.x() - 6;
     int sw = 12, sh = 18;
     int sy = height() - sh - 2;
     return QRect(sx, sy, sw, sh);
 }