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Fix visual glitch in `scroll_bar_rect` added in #5070

This commit is contained in:
Emil Ernerfeldt 2024-09-05 08:09:35 +02:00
parent 9fe4028f43
commit 2be93aca5d
1 changed files with 23 additions and 22 deletions
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45
crates/egui/src/containers/scroll_area.rs
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@ -986,10 +986,6 @@ impl Prepared {
continue;
}
// left/right of a horizontal scroll (d==1)
// top/bottom of vertical scroll (d == 1)
let main_range = Rangef::new(scroll_bar_rect.min[d], scroll_bar_rect.max[d]);
// Margin on either side of the scroll bar:
let inner_margin = show_factor * scroll_style.bar_inner_margin;
let outer_margin = show_factor * scroll_style.bar_outer_margin;
@ -1043,7 +1039,7 @@ impl Prepared {
cross.min = cross.max - width;
}
let outer_scroll_rect = if d == 0 {
let outer_scroll_bar_rect = if d == 0 {
Rect::from_min_max(
pos2(scroll_bar_rect.left(), cross.min),
pos2(scroll_bar_rect.right(), cross.max),
@ -1055,22 +1051,25 @@ impl Prepared {
)
};
let from_content = |content| remap_clamp(content, 0.0..=content_size[d], main_range);
let from_content = |content| {
remap_clamp(
content,
0.0..=content_size[d],
scroll_bar_rect.min[d]..=scroll_bar_rect.max[d],
)
};
let handle_rect = if d == 0 {
Rect::from_min_max(
pos2(from_content(state.offset.x), cross.min),
pos2(
from_content(state.offset.x + scroll_bar_rect.width()),
cross.max,
),
pos2(from_content(state.offset.x + inner_rect.width()), cross.max),
)
} else {
Rect::from_min_max(
pos2(cross.min, from_content(state.offset.y)),
pos2(
cross.max,
from_content(state.offset.y + scroll_bar_rect.height()),
from_content(state.offset.y + inner_rect.height()),
),
)
};
@ -1081,7 +1080,7 @@ impl Prepared {
} else {
Sense::hover()
};
let response = ui.interact(outer_scroll_rect, interact_id, sense);
let response = ui.interact(outer_scroll_bar_rect, interact_id, sense);
state.scroll_bar_interaction[d] = response.hovered() || response.dragged();
@ -1091,16 +1090,21 @@ impl Prepared {
if handle_rect.contains(pointer_pos) {
pointer_pos[d] - handle_rect.min[d]
} else {
let handle_top_pos_at_bottom = main_range.max - handle_rect.size()[d];
let handle_top_pos_at_bottom =
scroll_bar_rect.max[d] - handle_rect.size()[d];
// Calculate the new handle top position, centering the handle on the mouse.
let new_handle_top_pos = (pointer_pos[d] - handle_rect.size()[d] / 2.0)
.clamp(main_range.min, handle_top_pos_at_bottom);
.clamp(scroll_bar_rect.min[d], handle_top_pos_at_bottom);
pointer_pos[d] - new_handle_top_pos
}
});
let new_handle_top = pointer_pos[d] - *scroll_start_offset_from_top_left;
state.offset[d] = remap(new_handle_top, main_range, 0.0..=content_size[d]);
state.offset[d] = remap(
new_handle_top,
scroll_bar_rect.min[d]..=scroll_bar_rect.max[d],
0.0..=content_size[d],
);
// some manual action taken, scroll not stuck
state.scroll_stuck_to_end[d] = false;
@ -1117,22 +1121,19 @@ impl Prepared {
state.vel[d] = 0.0;
}
if ui.is_rect_visible(outer_scroll_rect) {
if ui.is_rect_visible(outer_scroll_bar_rect) {
// Avoid frame-delay by calculating a new handle rect:
let mut handle_rect = if d == 0 {
Rect::from_min_max(
pos2(from_content(state.offset.x), cross.min),
pos2(
from_content(state.offset.x + scroll_bar_rect.width()),
cross.max,
),
pos2(from_content(state.offset.x + inner_rect.width()), cross.max),
)
} else {
Rect::from_min_max(
pos2(cross.min, from_content(state.offset.y)),
pos2(
cross.max,
from_content(state.offset.y + scroll_bar_rect.height()),
from_content(state.offset.y + inner_rect.height()),
),
)
};
@ -1207,7 +1208,7 @@ impl Prepared {
// Background:
ui.painter().add(epaint::Shape::rect_filled(
outer_scroll_rect,
outer_scroll_bar_rect,
visuals.rounding,
ui.visuals()
.extreme_bg_color