slint/tests/cases/widgets/scrollview.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 { ScrollView } from "std-widgets.slint";
export component TestCase inherits Window {
    width: 100px;
    height: 100px;
    box := ScrollView {
        viewport-width: 500px;
        viewport-height: 500px;
    }

    callback scrolled <=> box.scrolled;
    in-out property <length> viewport-x <=> box.viewport-x;
    in-out property <length> viewport-y <=> box.viewport-y;
}

/*


```rust
use slint::{LogicalPosition, platform::WindowEvent};
use std::cell::RefCell;
use std::rc::Rc;

let instance = TestCase::new().unwrap();

let scrolled_emitted = Rc::new(RefCell::new(false));

instance.on_scrolled({
    let scrolled_emitted = scrolled_emitted.clone();
    move || {
    *scrolled_emitted.borrow_mut() = true;
}});

assert_eq!(*scrolled_emitted.borrow(), false);

let position = LogicalPosition::new(15.0, 95.0);

// Scroll horizontally by pressing on the handle
let button = slint::platform::PointerEventButton::Left;
instance.window().dispatch_event(WindowEvent::PointerPressed { position, button });

// then drag it
let position = LogicalPosition::new(50.0, 95.0);
instance.window().dispatch_event(WindowEvent::PointerMoved { position });

instance.window().dispatch_event(WindowEvent::PointerReleased { position, button });

assert_eq!(*scrolled_emitted.borrow(), true);
assert!(instance.get_viewport_x() != 0.0);
assert_eq!(instance.get_viewport_y(), 0.0);

*scrolled_emitted.borrow_mut() = false;

// Scroll vertically by pressing on the handle
let position = LogicalPosition::new(95.0, 15.0);

let button = slint::platform::PointerEventButton::Left;
instance.window().dispatch_event(WindowEvent::PointerPressed { position, button });

// ...then drag it
let position = LogicalPosition::new(95.0, 50.0);
instance.window().dispatch_event(WindowEvent::PointerMoved { position });

instance.window().dispatch_event(WindowEvent::PointerReleased { position, button });
assert_eq!(*scrolled_emitted.borrow(), true);
assert!(instance.get_viewport_x() != 0.0);
assert!(instance.get_viewport_y() != 0.0);

*scrolled_emitted.borrow_mut() = false;
```


*/