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Smoother panel animation (#8199)

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This commit is contained in:
Emil Ernerfeldt
2026-05-25 15:25:26 +02:00
committed by GitHub
parent f57291bac0
commit 5669725b1c
1 changed files with 13 additions and 4 deletions
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17
crates/egui/src/containers/panel.rs
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@@ -778,10 +778,19 @@ impl Panel {
parent_ui.set_cursor_icon(self.cursor_icon(outer_size));
}
if !resize_drag_in_progress {
// Skipping during a drag
// means the stored size reflects the panel's pre-drag size — so a
// drag-to-close followed by a drag-to-reopen restores the original size.
let is_animating = 0.0 < self.slide_fraction && self.slide_fraction < 1.0;
if !resize_drag_in_progress && !is_animating || PanelState::load(parent_ui, id).is_none() {
// We skip stoing state during a drag, so that the
// stored size reflects the panel's pre-drag size.
// This is so that drag-to-close followed by a drag-to-reopen restores the original size.
// Skipping when `!persist_state` keeps interpolated sizes (set by the
// collapse animation in `show_switched`) from polluting the panel's
// natural persisted size.
// Finally, we always store the state if it's not already stored,
// so we get a good estimate for the final size when first expanding a panel.
PanelState {
outer_rect: shifted_outer_rect,
}