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Fix nested scrolling (#83)

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Add scroll_delta in FrameState to fix nested scrolling.

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
This commit is contained in:
lucaspoffo 2020-12-29 08:24:57 -03:00 committed by GitHub
parent d7e03cb186
commit 46471f930d
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 16 additions and 3 deletions
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16
egui/src/containers/scroll_area.rs
View file

@ -230,9 +230,19 @@ impl Prepared {
}
}
// TODO: check that nothing else is being interacted with
let max_offset = content_size.y - inner_rect.height();
if ui.rect_contains_mouse(outer_rect) {
state.offset.y -= ui.input().scroll_delta.y;
let mut frame_state = ui.ctx().frame_state();
let scroll_delta = frame_state.scroll_delta;
let scrolling_up = state.offset.y > 0.0 && scroll_delta.y > 0.0;
let scrolling_down = state.offset.y < max_offset && scroll_delta.y < 0.0;
if scrolling_up || scrolling_down {
state.offset.y -= scroll_delta.y;
// Clear scroll delta so no parent scroll will use it.
frame_state.scroll_delta = Vec2::zero();
}
}
let show_scroll_this_frame = content_is_too_small || always_show_scroll;
@ -286,7 +296,7 @@ impl Prepared {
}
state.offset.y = state.offset.y.max(0.0);
state.offset.y = state.offset.y.min(content_size.y - inner_rect.height());
state.offset.y = state.offset.y.min(max_offset);
// Avoid frame-delay by calculating a new handle rect:
let mut handle_rect = Rect::from_min_max(

3
egui/src/context.rs
View file

@ -38,6 +38,7 @@ pub(crate) struct FrameState {
/// How much space is used by panels.
used_by_panels: Rect,
pub(crate) scroll_delta: Vec2,
pub(crate) scroll_target: Option<(f32, Align)>,
// TODO: move some things from `Memory` to here
}
@ -48,6 +49,7 @@ impl Default for FrameState {
available_rect: Rect::invalid(),
unused_rect: Rect::invalid(),
used_by_panels: Rect::invalid(),
scroll_delta: Vec2::zero(),
scroll_target: None,
}
}
@ -58,6 +60,7 @@ impl FrameState {
self.available_rect = input.screen_rect();
self.unused_rect = input.screen_rect();
self.used_by_panels = Rect::nothing();
self.scroll_delta = input.scroll_delta;
self.scroll_target = None;
}