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UI layout tree debug print (#8521)
# Objective Copy the `debug::print_tree` function from Taffy except display entity ids instead of Taffy's node ids and indicate which ui nodes have a measure func.
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2 changed files with 88 additions and 0 deletions
87
crates/bevy_ui/src/layout/debug.rs
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87
crates/bevy_ui/src/layout/debug.rs
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@ -0,0 +1,87 @@
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use crate::UiSurface;
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use bevy_ecs::prelude::Entity;
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use bevy_utils::HashMap;
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use std::fmt::Write;
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use taffy::prelude::Node;
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use taffy::tree::LayoutTree;
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/// Prints a debug representation of the computed layout of the UI layout tree for each window.
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pub fn print_ui_layout_tree(ui_surface: &UiSurface) {
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let taffy_to_entity: HashMap<Node, Entity> = ui_surface
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.entity_to_taffy
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.iter()
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.map(|(entity, node)| (*node, *entity))
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.collect();
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for (&entity, &node) in ui_surface.window_nodes.iter() {
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let mut out = String::new();
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print_node(
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ui_surface,
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&taffy_to_entity,
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entity,
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node,
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false,
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String::new(),
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&mut out,
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);
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bevy_log::info!("Layout tree for window entity: {entity:?}\n{out}");
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}
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}
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/// Recursively navigates the layout tree printing each node's information.
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fn print_node(
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ui_surface: &UiSurface,
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taffy_to_entity: &HashMap<Node, Entity>,
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entity: Entity,
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node: Node,
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has_sibling: bool,
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lines_string: String,
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acc: &mut String,
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) {
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let tree = &ui_surface.taffy;
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let layout = tree.layout(node).unwrap();
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let style = tree.style(node).unwrap();
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let num_children = tree.child_count(node).unwrap();
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let display_variant = match (num_children, style.display) {
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(_, taffy::style::Display::None) => "NONE",
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(0, _) => "LEAF",
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(_, taffy::style::Display::Flex) => "FLEX",
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(_, taffy::style::Display::Grid) => "GRID",
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};
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let fork_string = if has_sibling {
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"├── "
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} else {
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"└── "
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};
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writeln!(
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acc,
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"{lines}{fork} {display} [x: {x:<4} y: {y:<4} width: {width:<4} height: {height:<4}] ({entity:?}) {measured}",
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lines = lines_string,
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fork = fork_string,
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display = display_variant,
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x = layout.location.x,
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y = layout.location.y,
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width = layout.size.width,
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height = layout.size.height,
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measured = if tree.needs_measure(node) { "measured" } else { "" }
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).ok();
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let bar = if has_sibling { "│ " } else { " " };
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let new_string = lines_string + bar;
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// Recurse into children
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for (index, child_node) in tree.children(node).unwrap().iter().enumerate() {
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let has_sibling = index < num_children - 1;
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let child_entity = taffy_to_entity.get(child_node).unwrap();
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print_node(
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ui_surface,
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taffy_to_entity,
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*child_entity,
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*child_node,
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has_sibling,
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new_string.clone(),
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acc,
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);
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}
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}
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@ -1,4 +1,5 @@
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mod convert;
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pub mod debug;
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use crate::{ContentSize, Node, Style, UiScale};
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use bevy_ecs::{
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