src/colorbox.cpp

   1 #include <QStylePainter>
   2 #include <QStyleOptionComboBox>
   3 #include <QMouseEvent>
   4 #include <QColorDialog>
   5 #include <QComboBox>
   6 #include "colorbox.h"
   7
   8
   9 ColorBox::ColorBox(QWidget *parent) : QWidget(parent)
  10 {
  11         _color = Qt::red;
  12         setSizePolicy(QSizePolicy::QSizePolicy::Minimum, QSizePolicy::Fixed);
  13 }
  14
  15 QSize ColorBox::sizeHint() const
  16 {
  17         static QSize size;
  18         if (size.isValid())
  19                 return size;
  20
  21         QComboBox cb;
  22         size = cb.sizeHint();
  23         return size;
  24 }
  25
  26 void ColorBox::paintEvent(QPaintEvent *event)
  27 {
  28         Q_UNUSED(event);
  29
  30     QStylePainter painter(this);
  31
  32     QStyleOptionComboBox option;
  33         option.initFrom(this);
  34
  35 #if defined(Q_OS_MAC) || defined(Q_OS_WIN32)
  36         painter.setBrush(_color);
  37         painter.drawPrimitive(QStyle::PE_Frame, option);
  38 #else // Q_OS_MAC || Q_OS_WIN32
  39         // Fallback for some broken QT4 styles that do not draw the background
  40         painter.setBrush(_color);
  41         painter.setPen(Qt::NoPen);
  42         painter.drawRect(event->rect().adjusted(2, 2, -2, -2));
  43         // If works (QT5 and most QT4 styles) overpaints the previous rectangle
  44         option.palette.setBrush(QPalette::Base, _color);
  45         painter.drawPrimitive(QStyle::PE_PanelLineEdit, option);
  46         painter.drawPrimitive(QStyle::PE_FrameLineEdit, option);
  47 #endif // Q_OS_MAC || Q_OS_WIN32
  48 }
  49
  50 void ColorBox::mousePressEvent(QMouseEvent *event)
  51 {
  52         if (event->button() != Qt::LeftButton)
  53                 return;
  54
  55         QColor color = QColorDialog::getColor(_color, this, QString(),
  56           QColorDialog::ShowAlphaChannel);
  57         if (color.isValid()) {
  58                 _color = color;
  59                 update();
  60                 emit colorChanged(_color);
  61         }
  62 }
  63
  64 void ColorBox::setColor(const QColor &color)
  65 {
  66         _color = color;
  67         update();
  68 }