measure root node of layout

wgui/src/layout.rs

@@ -11,7 +11,7 @@ use crate::{
 	widget::{self, EventParams, WidgetState, div::Div},
 };
 
-use glam::Vec2;
+use glam::{Vec2, vec2};
 use slotmap::HopSlotMap;
 use taffy::{TaffyTree, TraversePartialTree};
 
@@ -37,6 +37,7 @@ pub struct Layout {
 	pub root_node: taffy::NodeId,
 
 	pub prev_size: Vec2,
+	pub content_size: Vec2,
 
 	pub needs_redraw: bool,
 
@@ -227,7 +228,7 @@ impl Layout {
 			None, // no parent
 			Div::create()?,
 			taffy::Style {
-				size: taffy::Size::percent(1.0),
+				size: taffy::Size::auto(),
 				..Default::default()
 			},
 		)?;
@@ -235,6 +236,7 @@ impl Layout {
 		Ok(Self {
 			tree,
 			prev_size: Vec2::default(),
+			content_size: Vec2::default(),
 			root_node,
 			root_widget,
 			widget_node_map,
@@ -293,6 +295,9 @@ impl Layout {
 					}
 				},
 			)?;
+			let root_size = self.tree.layout(self.root_node).unwrap().size;
+			self.content_size = vec2(root_size.width, root_size.height);
+			log::error!("ContentSize: {:?}", self.content_size);
 		}
 		Ok(())
 	}

wlx-overlay-s/src/gui/panel.rs

@@ -172,8 +172,8 @@ impl OverlayRenderer for GuiPanel {
     fn frame_meta(&mut self) -> Option<FrameMeta> {
         Some(FrameMeta {
             extent: [
-                self.max_size.max(self.layout.prev_size.x as _),
-                self.max_size.max(self.layout.prev_size.y as _),
+                self.max_size.max(self.layout.content_size.x as _),
+                self.max_size.max(self.layout.content_size.y as _),
                 1,
             ],
             ..Default::default()

wlx-overlay-s/src/overlays/keyboard/builder.rs

@@ -51,11 +51,6 @@ where
         processes: vec![],
     }));
 
-    let size = vec2(
-        layout.row_size * PIXELS_PER_UNIT,
-        (layout.main_layout.len() as f32) * PIXELS_PER_UNIT,
-    );
-
     let mut panel = GuiPanel::new_blank(app, 2048)?;
 
     let (background, _) = panel.layout.add_child(
@@ -217,8 +212,13 @@ where
         }
     }
 
+    panel.layout.update(vec2(2048., 2048.), 0.0)?;
+
     let interaction_transform = Affine2::from_translation(vec2(0.5, 0.5))
-        * Affine2::from_scale(vec2(1., -size.x as f32 / size.y as f32));
+        * Affine2::from_scale(vec2(
+            1.,
+            -panel.layout.content_size.x / panel.layout.content_size.y,
+        ));
 
     let width = layout.row_size * 0.05 * app.session.config.keyboard_scale;