slint/internal/compiler/widgets/qt/spinner.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

export component Spinner {
    in property <float> progress;
    in property <bool> indeterminate;

    private property <int> count: 12;

    min-width: 30px;
    min-height: 30px;
    horizontal-stretch: 0;
    vertical-stretch: 0;
    accessible-role: progress-indicator;
    accessible-value: !root.indeterminate ? root.progress : "";
    accessible-value-minimum: 0.0;
    accessible-value-maximum: 1.0;

    for i in count : Path {
        property <angle> angle: -90deg + i*1turn / count;
        stroke: NativeStyleMetrics.default-text-color;
        opacity: {
            if (indeterminate) {
                return 0.9 - 0.8 * Math.mod(count * animation-tick() / 1s - i, count) / count;
            } else if (i < progress * count){
                return 0.9;
            } else {
                return 0.1 + 0.8 * (i - progress * count) / count;
            }
        }
        stroke-width: 2.5px;
        viewbox-height: 1;
        viewbox-width: 1;
        MoveTo {
            x: 0.5 + 0.3 * Math.cos(angle);
            y: 0.5 + 0.3 * Math.sin(angle);
        }
        LineTo {
            x: 0.5 + 0.5 * Math.cos(angle);
            y: 0.5 + 0.5 * Math.sin(angle);
        }
    }
}