// The signature: a one-pixel hairline along the top edge of a glass surface,
// running blue on the left to orchid on the right and fading out before it
// reaches either corner.
//
// It reads as light catching the bevel of a pane of glass, which is why it sits
// at the very top edge and nowhere else — put it on all four sides and it stops
// being light and becomes a border.
//
// Every glass surface in the shell carries one, so the bar, dock, popovers and
// notification cards all read as the same material.
//
// Usage — anchor it to the top of the surface and inset it past the corner
// radius so it doesn't overhang the curve:
//
//   PrismEdge {
//       anchors { top: parent.top; left: parent.left; right: parent.right }
//       inset: parent.radius
//   }

import QtQuick
import qs.config

Rectangle {
    id: root

    // Horizontal inset, normally the parent's corner radius. Below that the
    // line runs out onto the curve and looks like a rendering artefact.
    property real inset: Theme.popoverRadius

    anchors.leftMargin: root.inset
    anchors.rightMargin: root.inset

    implicitHeight: 1
    height: 1

    // The colour stops are the only place the two accents touch.
    gradient: Gradient {
        orientation: Gradient.Horizontal

        GradientStop {
            position: 0.0
            color: Theme.alpha(Theme.accent, 0)
        }
        GradientStop {
            position: Theme.prismStart
            color: Theme.alpha(Theme.accent, Theme.prismEdgeAlpha)
        }
        GradientStop {
            position: Theme.prismEnd
            color: Theme.alpha(Theme.accentSecondary, Theme.prismEdgeAlpha)
        }
        GradientStop {
            position: 1.0
            color: Theme.alpha(Theme.accentSecondary, 0)
        }
    }
}