require 'Qt'

class LCDRange < Qt::Widget
    signals 'valueChanged(int)'
    slots 'setValue(int)', 'setRange(int, int)'

    def initialize(parent = nil)
        super
        lcd = Qt::LCDNumber.new(2)
        @slider = Qt::Slider.new(Qt::Horizontal)
        @slider.range = 0..99
        @slider.setValue(0)
        connect(@slider, SIGNAL('valueChanged(int)'), lcd, SLOT('display(int)'))
        connect(@slider, SIGNAL('valueChanged(int)'), SIGNAL('valueChanged(int)'))

        layout = Qt::VBoxLayout.new
        layout.addWidget(lcd)
        layout.addWidget(@slider)
        setLayout(layout)

        setFocusProxy(@slider)
    end

    def value()
        @slider.value()
    end

    def setValue( value )
        @slider.setValue( value )
    end
    
    def range=( r )
        setRange(r.begin, r.end)
    end

    def setRange( minVal, maxVal )
        if minVal < 0 || maxVal > 99 || minVal > maxVal
              printf( "LCDRange::setRange(%d,%d)\n" +
                       "\tRange must be 0..99\n" +
                       "\tand minVal must not be greater than maxVal",
                       minVal, maxVal )
            return
        end
        @slider.setRange( minVal, maxVal )
    end
end