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Code Issues Projects Releases Packages Wiki Activity Actions 12

Listen for mouse events on scrollbar

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This commit is contained in:
Antonio Scandurra 2023-12-11 10:33:05 +01:00
parent 03df63aa00
commit e3c0b1f903
2 changed files with 88 additions and 48 deletions
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123
crates/editor2/src/element.rs
View file

@ -1248,7 +1248,7 @@ impl EditorElement {
let bottom = bounds.lower_left().y;
let right = bounds.lower_right().x;
let left = self.scrollbar_left(&bounds);
let row_range = &layout.scrollbar_row_range;
let row_range = layout.scrollbar_row_range.clone();
let max_row = layout.max_row as f32 + (row_range.end - row_range.start);
let mut height = bounds.size.height;
@ -1369,53 +1369,80 @@ impl EditorElement {
);
}
// cx.scene().push_cursor_region(CursorRegion {
// bounds: track_bounds,
// style: CursorStyle::Arrow,
// });
// let region_id = cx.view_id();
// cx.scene().push_mouse_region(
// MouseRegion::new::<ScrollbarMouseHandlers>(region_id, region_id, track_bounds)
// .on_move(move |event, editor: &mut Editor, cx| {
// if event.pressed_button.is_none() {
// editor.scroll_manager.show_scrollbar(cx);
// }
// })
// .on_down(MouseButton::Left, {
// let row_range = row_range.clone();
// move |event, editor: &mut Editor, cx| {
// let y = event.position.y;
// if y < thumb_top || thumb_bottom < y {
// let center_row = ((y - top) * max_row as f32 / height).round() as u32;
// let top_row = center_row
// .saturating_sub((row_range.end - row_range.start) as u32 / 2);
// let mut position = editor.scroll_position(cx);
// position.set_y(top_row as f32);
// editor.set_scroll_position(position, cx);
// } else {
// editor.scroll_manager.show_scrollbar(cx);
// }
// }
// })
// .on_drag(MouseButton::Left, {
// move |event, editor: &mut Editor, cx| {
// if event.end {
// return;
// }
let mouse_position = cx.mouse_position();
if track_bounds.contains_point(&mouse_position) {
cx.set_cursor_style(CursorStyle::Arrow);
}
// let y = event.prev_mouse_position.y;
// let new_y = event.position.y;
// if thumb_top < y && y < thumb_bottom {
// let mut position = editor.scroll_position(cx);
// position.set_y(position.y + (new_y - y) * (max_row as f32) / height);
// if position.y < 0.0 {
// position.set_y(0.);
// }
// editor.set_scroll_position(position, cx);
// }
// }
// }),
// );
cx.on_mouse_event({
let editor = self.editor.clone();
move |event: &MouseMoveEvent, phase, cx| {
if phase == DispatchPhase::Capture {
return;
}
editor.update(cx, |editor, cx| {
if event.pressed_button == Some(MouseButton::Left)
&& editor.scroll_manager.is_dragging_scrollbar()
{
let y = mouse_position.y;
let new_y = event.position.y;
if thumb_top < y && y < thumb_bottom {
let mut position = editor.scroll_position(cx);
position.y += (new_y - y) * (max_row as f32) / height;
if position.y < 0.0 {
position.y = 0.0;
}
editor.set_scroll_position(position, cx);
}
cx.stop_propagation();
} else {
editor.scroll_manager.set_is_dragging_scrollbar(false, cx);
if track_bounds.contains_point(&event.position) {
editor.scroll_manager.show_scrollbar(cx);
}
}
})
}
});
if self.editor.read(cx).scroll_manager.is_dragging_scrollbar() {
cx.on_mouse_event({
let editor = self.editor.clone();
move |event: &MouseUpEvent, phase, cx| {
editor.update(cx, |editor, cx| {
editor.scroll_manager.set_is_dragging_scrollbar(false, cx);
cx.stop_propagation();
});
}
});
} else {
cx.on_mouse_event({
let editor = self.editor.clone();
move |event: &MouseDownEvent, phase, cx| {
editor.update(cx, |editor, cx| {
if track_bounds.contains_point(&event.position) {
editor.scroll_manager.set_is_dragging_scrollbar(true, cx);
let y = event.position.y;
if y < thumb_top || thumb_bottom < y {
let center_row =
((y - top) * max_row as f32 / height).round() as u32;
let top_row = center_row
.saturating_sub((row_range.end - row_range.start) as u32 / 2);
let mut position = editor.scroll_position(cx);
position.y = top_row as f32;
editor.set_scroll_position(position, cx);
} else {
editor.scroll_manager.show_scrollbar(cx);
}
cx.stop_propagation();
}
});
}
});
}
}
#[allow(clippy::too_many_arguments)]
@ -2819,7 +2846,7 @@ impl Element for EditorElement {
})
}
self.paint_scrollbar(bounds, &mut layout, cx);
cx.with_z_index(2, |cx| self.paint_scrollbar(bounds, &mut layout, cx));
});
});
})

13
crates/editor2/src/scroll.rs
View file

@ -136,6 +136,7 @@ pub struct ScrollManager {
last_autoscroll: Option<(gpui::Point<f32>, f32, f32, AutoscrollStrategy)>,
show_scrollbars: bool,
hide_scrollbar_task: Option<Task<()>>,
dragging_scrollbar: bool,
visible_line_count: Option<f32>,
}
@ -148,6 +149,7 @@ impl ScrollManager {
autoscroll_request: None,
show_scrollbars: true,
hide_scrollbar_task: None,
dragging_scrollbar: false,
last_autoscroll: None,
visible_line_count: None,
}
@ -278,6 +280,17 @@ impl ScrollManager {
self.autoscroll_request.is_some()
}
pub fn is_dragging_scrollbar(&self) -> bool {
self.dragging_scrollbar
}
pub fn set_is_dragging_scrollbar(&mut self, dragging: bool, cx: &mut ViewContext<Editor>) {
if dragging != self.dragging_scrollbar {
self.dragging_scrollbar = dragging;
cx.notify();
}
}
pub fn clamp_scroll_left(&mut self, max: f32) -> bool {
if max < self.anchor.offset.x {
self.anchor.offset.x = max;