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Implement mouse wheel transactions for scrollable

Browse source 
See https://wiki.mozilla.org/Gecko:Mouse_Wheel_Scrolling#Mouse_wheel_transaction

Co-authored-by: Daniel Yoon <101683475+Koranir@users.noreply.github.com>
This commit is contained in:
Héctor Ramón Jiménez 2024-09-08 16:00:22 +02:00
parent dff14bd440
commit 502c5fdfbc
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GPG key ID: 7CC46565708259A7
1 changed files with 34 additions and 9 deletions
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43
widget/src/scrollable.rs
View file

@ -7,6 +7,7 @@ use crate::core::layout;
use crate::core::mouse;
use crate::core::overlay;
use crate::core::renderer;
use crate::core::time::{Duration, Instant};
use crate::core::touch;
use crate::core::widget;
use crate::core::widget::operation::{self, Operation};
@ -470,6 +471,24 @@ where
let (mouse_over_y_scrollbar, mouse_over_x_scrollbar) =
scrollbars.is_mouse_over(cursor);
if let Some(last_scrolled) = state.last_scrolled {
let clear_transaction = match event {
Event::Mouse(
mouse::Event::ButtonPressed(_)
| mouse::Event::ButtonReleased(_)
| mouse::Event::CursorLeft,
) => true,
Event::Mouse(mouse::Event::CursorMoved { .. }) => {
last_scrolled.elapsed() > Duration::from_millis(100)
}
_ => last_scrolled.elapsed() > Duration::from_millis(1500),
};
if clear_transaction {
state.last_scrolled = None;
}
}
if let Some(scroller_grabbed_at) = state.y_scroller_grabbed_at {
match event {
Event::Mouse(mouse::Event::CursorMoved { .. })
@ -612,7 +631,11 @@ where
}
}
let mut event_status = {
let content_status = if state.last_scrolled.is_some()
&& matches!(event, Event::Mouse(mouse::Event::WheelScrolled { .. }))
{
event::Status::Ignored
} else {
let cursor = match cursor_over_scrollable {
Some(cursor_position)
if !(mouse_over_x_scrollbar || mouse_over_y_scrollbar) =>
@ -660,10 +683,10 @@ where
state.x_scroller_grabbed_at = None;
state.y_scroller_grabbed_at = None;
return event_status;
return content_status;
}
if let event::Status::Captured = event_status {
if let event::Status::Captured = content_status {
return event::Status::Captured;
}
@ -699,7 +722,7 @@ where
state.scroll(delta, self.direction, bounds, content_bounds);
event_status = if notify_on_scroll(
if notify_on_scroll(
state,
&self.on_scroll,
bounds,
@ -709,7 +732,7 @@ where
event::Status::Captured
} else {
event::Status::Ignored
};
}
}
Event::Touch(event)
if state.scroll_area_touched_at.is_some()
@ -760,12 +783,10 @@ where
_ => {}
}
event_status = event::Status::Captured;
event::Status::Captured
}
_ => {}
_ => event::Status::Ignored,
}
event_status
}
fn draw(
@ -1133,7 +1154,9 @@ fn notify_on_scroll<Message>(
if let Some(on_scroll) = on_scroll {
shell.publish(on_scroll(viewport));
}
state.last_notified = Some(viewport);
state.last_scrolled = Some(Instant::now());
true
}
@ -1147,6 +1170,7 @@ struct State {
x_scroller_grabbed_at: Option<f32>,
keyboard_modifiers: keyboard::Modifiers,
last_notified: Option<Viewport>,
last_scrolled: Option<Instant>,
}
impl Default for State {
@ -1159,6 +1183,7 @@ impl Default for State {
x_scroller_grabbed_at: None,
keyboard_modifiers: keyboard::Modifiers::default(),
last_notified: None,
last_scrolled: None,
}
}
}