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import QtQuick 2.10
import QtQuick.Controls.Material 2.3
import QtQuick.Controls.Material.impl 2.3

/*
   A implementation of CSS's box-shadow, used by ElevationEffect for a Material Design
   elevation shadow effect.
 */
RectangularGlow {
    // The 4 properties from CSS box-shadow, plus the inherited color property
    property int offsetX
    property int offsetY
    property int blurRadius
    property int spreadRadius

    // The source item the shadow is being applied to, used for correctly
    // calculating the corner radious
    property Item source

    property bool fullWidth
    property bool fullHeight

    x: (parent.width - width)/2 + offsetX
    y: (parent.height - height)/2 + offsetY

    implicitWidth: source ? source.width : parent.width
    implicitHeight: source ? source.height : parent.height

    width: implicitWidth + 2 * spreadRadius + (fullWidth ? 2 * cornerRadius : 0)
    height: implicitHeight + 2 * spreadRadius + (fullHeight ? 2 * cornerRadius : 0)
    glowRadius: blurRadius/2
    spread: 0.05
    cornerRadius: blurRadius + (source && source.radius || 0)
}
