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Implement drag scroll, fixes #154

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Jeremy Soller 2025-02-05 15:28:38 -07:00
parent f4ef25e755
commit 04f2812f4e
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3 changed files with 109 additions and 53 deletions
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24
src/text_box.rs
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@ -42,6 +42,7 @@ pub struct TextBox<'a, Message> {
metrics: Metrics,
id: Option<Id>,
padding: Padding,
on_auto_scroll: Option<Box<dyn Fn(Option<f32>) -> Message + 'a>>,
on_changed: Option<Message>,
click_timing: Duration,
has_context_menu: bool,
@ -60,6 +61,7 @@ where
metrics,
id: None,
padding: Padding::new(0.0),
on_auto_scroll: None,
on_changed: None,
click_timing: Duration::from_millis(500),
has_context_menu: false,
@ -79,6 +81,11 @@ where
self
}
pub fn on_auto_scroll(mut self, on_auto_scroll: impl Fn(Option<f32>) -> Message + 'a) -> Self {
self.on_auto_scroll = Some(Box::new(on_auto_scroll));
self
}
pub fn on_changed(mut self, on_changed: Message) -> Self {
self.on_changed = Some(on_changed);
self
@ -1109,6 +1116,9 @@ where
Event::Mouse(MouseEvent::ButtonReleased(Button::Left)) => {
state.dragging = None;
status = Status::Captured;
if let Some(on_auto_scroll) = &self.on_auto_scroll {
shell.publish(on_auto_scroll(None));
}
}
Event::Mouse(MouseEvent::CursorMoved { .. }) => {
if let Some(dragging) = &state.dragging {
@ -1124,6 +1134,20 @@ where
x: x as i32,
y: y as i32,
});
let auto_scroll = editor.with_buffer(|buffer| {
//TODO: ideal auto scroll speed
let speed = 10.0;
if y < 0.0 {
Some(y * speed)
} else if y > buffer.size().1.unwrap_or(0.0) {
Some((y - buffer.size().1.unwrap_or(0.0)) * speed)
} else {
None
}
});
if let Some(on_auto_scroll) = &self.on_auto_scroll {
shell.publish(on_auto_scroll(auto_scroll));
}
}
Dragging::ScrollbarV {
start_y,