slint/internal/compiler/widgets/cupertino/switch.slint

// Copyright © SixtyFPS GmbH <info@slint.dev>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-2.0 OR LicenseRef-Slint-Software-3.0

import { CupertinoFontSettings, CupertinoPalette } from "styling.slint";
import { FocusBorder } from "components.slint";

export component Switch {
    in property <bool> enabled: true;
    in property <string> text;
    out property <bool> has-focus: i-focus-scope.has-focus;
    in-out property <bool> checked;

    callback toggled;

    private property <brush> background: checked && root.enabled ? CupertinoPalette.accent-background : CupertinoPalette.alternate-control-background;
    private property <color> text-color: CupertinoPalette.foreground;

    function toggle-checked() {
        if(!root.enabled) {
            return;
        }

        root.checked = !root.checked;
        root.toggled();
    }

    min-width: 26px;
    min-height: max(15px, i-layout.min-height);
    vertical-stretch: 0;
    horizontal-stretch: 0;
    accessible-label: root.text;
    accessible-checkable: true;
    accessible-checked <=> root.checked;
    accessible-role: switch;
    accessible-action-default => {
        root.checked = !root.checked;
        root.toggled();
    }    
    forward-focus: i-focus-scope;

    states [
        disabled when !root.enabled : {
            root.opacity: 0.5;
        }
        pressed when i-touch-area.pressed : {
            root.background: root.checked ? CupertinoPalette.secondary-accent-background : CupertinoPalette.secondary-control-background;
        }
        selected when root.checked : {
            i-rail.background: CupertinoPalette.accent-background;
        }
    ]

    i-layout := HorizontalLayout {
        spacing: 12px;

        VerticalLayout {
            alignment: center;

           Rectangle {
                width: 26px;
                height: 15px;
                border-radius: 8px;

                i-rail := Rectangle {
                    border-radius: parent.border-radius;
                    background: root.background;
                    border-width: 0.5px;
                    border-color: CupertinoPalette.border;
                    clip: true;

                    Rectangle {
                        border-width: 1px;
                        border-color: @radial-gradient(circle, #00000026, #00000000);
                        border-radius: parent.border-radius;
                    }

                    animate background, border-color { duration: 150ms; easing: linear; }
                }

                i-thumb := Rectangle {
                    x: root.checked ? parent.width - self.width - 1px : 2px;
                    y: (parent.height - self.height) / 2;
                    height: parent.height - 2px;
                    width: self.height;
                    border-radius: self.height / 2;
                    background: CupertinoPalette.control-background-thumb;
                    drop-shadow-blur: 0.5px;
                    drop-shadow-offset-y: 0.25px;
                    drop-shadow-color: #0000001F;

                    animate background { duration: 150ms; easing: linear; }
                }

                // focus border
                if (root.has-focus && root.enabled) : FocusBorder {
                    border-radius: i-rail.border-radius;
                }
            }
        }

        if (root.text != "") : Text {
            text: root.text;
            color: root.text-color;
            font-size: CupertinoFontSettings.body.font-size;
            font-weight: CupertinoFontSettings.body.font-weight;
            vertical-alignment: center;
            horizontal-alignment: left;
        }
    }

    i-touch-area := TouchArea {
        enabled <=> root.enabled;

        clicked => {
            root.toggle-checked();
        }
    }

    i-focus-scope := FocusScope {
        x:0;
        width: 0px; // Do not react on clicks
        enabled <=> root.enabled;

        key-pressed(event) => {
            if (event.text == " " || event.text == "\n") {
                 root.toggle-checked();
                 return accept;
            }
            return reject;
        }
    }
}