import QtQuick 2.0
import QtGraphicalEffects 1.0

Item {
    width: 280
    height: 280

    Rectangle {
        anchors.fill: parent
        color: "black"
    }

    Text {
        id: clock
        anchors.centerIn: parent
        color: "red"

        Timer {
            repeat: true
            interval: 1000
            running: true
            property int count: 0
            onTriggered: {
                count = count +1
//                clock.width = count*2
                parent.text = count
            }
        }
        layer.enabled: true
        layer.effect: ShaderEffect {
            fragmentShader: "
                uniform lowp sampler2D source; // this item
                uniform lowp float qt_Opacity; // inherited opacity of this item
                varying highp vec2 qt_TexCoord0;
                void main() {
                    lowp vec4 p = texture2D(source, qt_TexCoord0);
                    lowp float g = dot(p.xyz, vec3(0.344, 0.5, 0.156));
                    gl_FragColor = vec4(g, g, g, p.a) * qt_Opacity;
                }"
        }
    }
}