connect(zoomSlider, SIGNAL(valueChanged(int)),
this, SLOT(onSliderValueChanged(int)));
connect(fontButton, SIGNAL(currentFontChanged(const QFont &)),
this, SLOT(onCurrentFontChanged(const QFont &)));
connect(box, SIGNAL(buttonClicked(int)),
this, SLOT(onSchemeButtonClicked(int)));
connect(zoomSlider, SIGNAL(valueChanged(int)),
this, SLOT(onSliderValueChanged(int)));
connect(fontButton, SIGNAL(currentFontChanged(const QFont &)),
this, SLOT(onCurrentFontChanged(const QFont &)));
connect(box, SIGNAL(buttonClicked(int)),
this, SLOT(onSchemeButtonClicked(int)));