style: add display="none"

wgui/src/drawing.rs

@@ -318,12 +318,16 @@ fn draw_children(params: &DrawParams, state: &mut DrawState, parent_node_id: taf
 	let layout = &params.layout;
 
 	for node_id in layout.state.tree.child_ids(parent_node_id) {
-		let Some(widget_id) = layout.state.tree.get_node_context(node_id).copied() else {
+		let Ok(style) = layout.state.tree.style(node_id) else {
 			debug_assert!(false);
 			continue;
 		};
 
-		let Ok(style) = layout.state.tree.style(node_id) else {
+		if style.display == taffy::Display::None {
+			continue;
+		}
+
+		let Some(widget_id) = layout.state.tree.get_node_context(node_id).copied() else {
 			debug_assert!(false);
 			continue;
 		};

wgui/src/layout.rs

@@ -405,6 +405,10 @@ impl Layout {
 
 		let style = self.state.tree.style(node_id)?;
 
+		if style.display == taffy::Display::None {
+			return Ok(());
+		}
+
 		let Some(widget) = self.state.widgets.get(widget_id) else {
 			debug_assert!(false);
 			anyhow::bail!("invalid widget");

wgui/src/parser/style.rs

@@ -117,6 +117,7 @@ pub fn parse_style(attribs: &[AttribPair]) -> taffy::Style {
 				"flex" => style.display = Display::Flex,
 				"block" => style.display = Display::Block,
 				"grid" => style.display = Display::Grid,
+				"none" => style.display = Display::None,
 				_ => {
 					print_invalid_attrib(key, value);
 				}