FormDelegateBackground.qml

/*
 * Copyright 2022 Devin Lin <devin@kde.org>
 * SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
import QtQuick
import QtQuick.Layouts
import QtQuick.Templates as T
import org.kde.kirigami as Kirigami
 
/**
 * @brief A background for Form delegates.
 *
 * This is a simple background that provides opacity feedback to the user
 * when the control has focus or is currently being pressed, for example.
 *
 * This is used in AbstractFormDelegate so that new delegates provide this
 * feedback by default, and can be easily overriden with a QtQuick.Item.
 *
 * @since KirigamiAddons 0.11.0
 *
 * @see AbstractFormDelegate
 *
 * @inherit QtQuick.Rectangle
 */
Kirigami.ShadowedRectangle {
    id: root
 
    /**
     * @brief The control to which the background will be assigned.
     */
    required property T.Control control
 
    readonly property bool _roundCorners: control.parent._roundCorners === true
    readonly property bool _isFirst: _roundCorners && control.parent.children[0] === control
    readonly property bool _isLast: _roundCorners && control.parent.children[control.parent.children.length - 1] === control
 
    color: {
        let colorOpacity = 0;
 
        if (!control.enabled) {
            colorOpacity = 0;
        } else if (control.pressed) {
            colorOpacity = 0.2;
        } else if (control.visualFocus) {
            colorOpacity = 0.1;
        } else if (!Kirigami.Settings.tabletMode && control.hovered) {
            colorOpacity = 0.07;
        }
 
        return Qt.rgba(Kirigami.Theme.textColor.r, Kirigami.Theme.textColor.g, Kirigami.Theme.textColor.b, colorOpacity)
    }
 
    corners {
        topLeftRadius: _isFirst ? Kirigami.Units.smallSpacing : 0
        topRightRadius: _isFirst ? Kirigami.Units.smallSpacing : 0
        bottomLeftRadius: _isLast ? Kirigami.Units.smallSpacing : 0
        bottomRightRadius: _isLast ? Kirigami.Units.smallSpacing : 0
    }
 
    Behavior on color {
        ColorAnimation { duration: Kirigami.Units.shortDuration }
    }
}