color_button.cpp

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#include <mapviz/color_button.h>

#include <QColorDialog>

namespace mapviz
{
ColorButton::ColorButton(QWidget *parent)
  :
  QPushButton(parent)
{
  setColor(Qt::black);
  QObject::connect(this, SIGNAL(clicked(bool)),
                   this, SLOT(handleClicked()));
}

void ColorButton::setColor(const QColor &color)
{
  if (!color.isValid() || color == color_) {
    return;
  }
  
  color_ = color;
  // This was a very strange bug.  On initialization, the constructor
  // would set the stylesheet to black, then the external owner would
  // call setColor to change the color to something else.  We would
  // properly set the internal color_ and stylesheet, but it would
  // continue to display black.  If the user changed the color, it
  // would change properly.  Calling setStylesheet() twice fixes the
  // behavior.
  setStyleSheet("background: " + color_.name());
  setStyleSheet("background: " + color_.name());
  Q_EMIT colorChanged(color_);
}

void ColorButton::handleClicked()
{
  // Note: We do not pass ourself as the parent or else the dialog
  // will inherit our color as the background!
  QColor new_color = QColorDialog::getColor(color_);
  if (!new_color.isValid() || new_color == color_) {
    return;
  }
  setColor(new_color);
  Q_EMIT colorEdited(new_color);
}
}  // namespace mapviz