slint/internal/compiler/widgets/fluent-base/combobox.slint

// Copyright © SixtyFPS GmbH <info@slint.dev>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-1.0 OR LicenseRef-Slint-commercial

import { Typography, Palette, Icons } from "styling.slint";
import { MenuBorder, ListItem, FocusBorder } from "components.slint";

export component ComboBox {
    callback selected(string /* current-value */);

    in property <[string]> model;
    in property <bool> enabled <=> i-focus-scope.enabled;
    out property <bool> has-focus <=> i-focus-scope.has-focus;
    in-out property <int> current-index: 0;
    in-out property <string> current-value: root.model[root.current-index];

    min-width: max(160px, i-layout.min-height);
    min-height: max(32px, i-layout.min-height);
    horizontal-stretch: 1;
    vertical-stretch: 0;
    forward-focus: i-focus-scope;

    i-focus-scope := FocusScope {
        key-pressed(event) => {
            if (event.text == Key.UpArrow) {
                root.move-selection-up();
                return accept;
            } else if (event.text == Key.DownArrow) {

                root.move-selection-down();
                return accept;
            } else if (event.text == Key.Return) {
                i-popup.show();
            }
            return reject;
        }

        i-touch-area := TouchArea {
            clicked => {
                root.focus();
                i-popup.show();
            }
        }
    }

    i-background := Rectangle {
        border-radius: 3px;
        background: Palette.control-default;
        border-width: 1px;
        border-color: Palette.control-border;

        i-layout := HorizontalLayout {
            padding-left: 11px;
            padding-right: 11px;
            spacing: 8px;

            i-text := Text {
                horizontal-alignment: left;
                vertical-alignment: center;
                font-size: Typography.body.font-size;
                font-weight: Typography.body.font-weight;
                color: Palette.text-primary;
                text: root.current-value;
            }

            i-icon := Image {
                colorize: Palette.text-secondary;
                width: 12px;
                source: Icons.dropdown;
                y: 2px;

                animate colorize { duration: 150ms; }
            }
        }

        animate border-color { duration: 200ms; }
    }

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

    i-popup := PopupWindow {
        x: 0;
        y: -46px;
        width: root.width;

        MenuBorder {
            VerticalLayout {
                padding: 4px;

                for value[index] in root.model : ListItem {
                    text: value;
                    selected: index == root.current-index;

                    clicked => {
                        root.select(index);
                    }
                }
            }
        }
    }

    function select(index: int) {
        root.current-index = index;
        root.current-value = root.model[root.current-index];
        root.selected(root.current-value);
    }

    function move-selection-up() {
        root.select(Math.max(root.current-index - 1, 0));
    }

    function move-selection-down() {
        root.select(Math.min(root.current-index + 1, root.model.length - 1));
    }

    states [
        disabled when !root.enabled : {
            i-background.background: Palette.control-disabled;
            i-background.border-color: Palette.control-stroke;
            i-text.color: Palette.text-disabled;
            i-icon.colorize: Palette.text-disabled;
        }
        pressed when i-touch-area.pressed : {
            i-background.background: Palette.control-alt-tertiary;
            i-background.border-color: Palette.control-stroke;
            i-text.color: Palette.text-secondary;
            i-icon.colorize: Palette.text-tertiary;
        }
        hover when i-touch-area.has-hover : {
            i-background.background: Palette.control-secondary;
        }
    ]
}