djkato/egui
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Hide all Area:s and Window:s the first frame to hide first-frame-jitters (#2385)

Browse source
This commit is contained in:
Emil Ernerfeldt 2022-12-05 11:18:01 +01:00 committed by GitHub
parent 0b2d56cff0
commit 3ba39c3022
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 9 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

26
crates/egui/src/containers/area.rs
View file

@ -192,11 +192,12 @@ pub(crate) struct Prepared {
move_response: Response,
enabled: bool,
drag_bounds: Option<Rect>,
/// Set the first frame of new windows with anchors.
/// We always make windows invisible the first frame to hide "first-frame-jitters".
///
/// This is so that we use the first frame to calculate the window size,
/// and then can correctly position the window the next frame,
/// without having one frame where the window is positioned in the wrong place.
/// and then can correctly position the window and its contents the next frame,
/// without having one frame where the window is wrongly positioned or sized.
temporarily_invisible: bool,
}
@ -242,24 +243,15 @@ impl Area {
});
state.pos = new_pos.unwrap_or(state.pos);
state.interactable = interactable;
let mut temporarily_invisible = false;
if pivot != Align2::LEFT_TOP {
if is_new {
temporarily_invisible = true; // figure out the size first
} else {
state.pos.x -= pivot.x().to_factor() * state.size.x;
state.pos.y -= pivot.y().to_factor() * state.size.y;
}
state.pos.x -= pivot.x().to_factor() * state.size.x;
state.pos.y -= pivot.y().to_factor() * state.size.y;
}
if let Some((anchor, offset)) = anchor {
if is_new {
temporarily_invisible = true; // figure out the size first
} else {
let screen = ctx.available_rect();
state.pos = anchor.align_size_within_rect(state.size, screen).min + offset;
}
let screen = ctx.available_rect();
state.pos = anchor.align_size_within_rect(state.size, screen).min + offset;
}
// interact right away to prevent frame-delay
@ -319,7 +311,7 @@ impl Area {
move_response,
enabled,
drag_bounds,
temporarily_invisible,
temporarily_invisible: is_new,
}
}