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use morphorm::Node;
use vizia_storage::LayoutTreeIterator;
use crate::layout::node::SubLayout;
use crate::prelude::*;
use super::{clipping_system, text_layout_system, text_system, transform_system};
/// Determines the size and position of views.
/// TODO: Currently relayout is done on an entire tree rather than incrementally.
/// Incremental relayout can be done by keeping a list of nodes that need relayout,
/// and when a node undergoes relayout remove the descendants that have been processed from the list,
/// then continue relayout on the remaining nodes in the list.
pub(crate) fn layout_system(cx: &mut Context) {
text_system(cx);
if cx.style.system_flags.contains(SystemFlags::RELAYOUT) {
// Perform layout on the whole tree.
Entity::root().layout(
&mut cx.cache,
&cx.tree,
&cx.style,
&mut SubLayout {
text_context: &mut cx.text_context,
resource_manager: &cx.resource_manager,
},
);
let cx = &mut EventContext::new(cx);
let iter = LayoutTreeIterator::full(cx.tree);
for entity in iter {
cx.current = entity;
if cx.style.display.get(entity).copied().unwrap_or_default() == Display::None {
continue;
}
// Morphorm produces relative positions so convert to absolute.
if let Some(parent) = cx.tree.get_layout_parent(entity) {
let parent_bounds = cx.cache.get_bounds(parent);
if let Some(bounds) = cx.cache.bounds.get_mut(entity) {
if let Some(relative_bounds) = cx.cache.relative_bounds.get(entity) {
let x = relative_bounds.x + parent_bounds.x;
let y = relative_bounds.y + parent_bounds.y;
let w = relative_bounds.w;
let h = relative_bounds.h;
let mut geo_changed = GeoChanged::empty();
if x != bounds.x {
geo_changed.set(GeoChanged::POSX_CHANGED, true);
}
if y != bounds.y {
geo_changed.set(GeoChanged::POSY_CHANGED, true);
}
if w != bounds.w {
geo_changed.set(GeoChanged::WIDTH_CHANGED, true);
cx.cache.path.remove(entity);
}
if h != bounds.h {
geo_changed.set(GeoChanged::HEIGHT_CHANGED, true);
cx.cache.path.remove(entity);
}
if let Some(geo) = cx.cache.geo_changed.get_mut(entity) {
*geo = geo_changed;
}
let new_bounds = BoundingBox { x, y, w, h };
// if new_bounds != *bounds && *bounds != BoundingBox::default() {
// cx.needs_redraw();
// }
*bounds = new_bounds;
}
}
}
cx.style.needs_text_layout(entity);
if let Some(geo) = cx.cache.geo_changed.get(entity).copied() {
if !geo.is_empty()
// && cx.style.text.get(entity).is_some()
{
cx.needs_redraw();
cx.needs_retransform();
cx.needs_reclip();
// If the entity clips its children (Overflow::Hidden or ClipPath::Shape)
// and its geometry changed, the clip path has changed too, so invalidate
// all descendants' cached draw_bounds.
if matches!(cx.style.overflowx.get(entity), Some(Overflow::Hidden))
|| matches!(cx.style.overflowy.get(entity), Some(Overflow::Hidden))
|| matches!(cx.style.clip_path.get(entity), Some(ClipPath::Shape(_)))
{
for descendant in LayoutTreeIterator::subtree(cx.tree, entity).skip(1) {
cx.cache.draw_bounds.remove(descendant);
}
}
}
// TODO: Use geo changed to determine whether an entity needs to be redrawn.
if !geo.is_empty() {
let mut event = Event::new(WindowEvent::GeometryChanged(geo))
.target(entity)
.origin(entity)
.propagate(Propagation::Direct);
visit_entity(cx, entity, &mut event);
}
}
if let Some(geo) = cx.cache.geo_changed.get_mut(entity) {
*geo = GeoChanged::empty();
}
}
// A relayout, retransform, or reclip, can cause the element under the cursor to change. So we push a mouse move event here to force
// a new event cycle and the hover system to trigger.
// However, skip this during capture to avoid sending stale coordinates that interfere with drag operations.
if let Some(proxy) = &cx.event_proxy {
if cx.captured.is_null() {
let event =
Event::new(WindowEvent::MouseMove(cx.mouse.cursor_x, cx.mouse.cursor_y))
.target(Entity::root())
.origin(Entity::root())
.propagate(Propagation::Up);
proxy.send(event).expect("Failed to send event");
}
}
cx.style.system_flags.set(SystemFlags::RELAYOUT, false);
}
text_layout_system(cx);
transform_system(cx);
clipping_system(cx);
}
fn visit_entity(cx: &mut EventContext, entity: Entity, event: &mut Event) {
// Send event to models attached to the entity
if let Some(ids) =
cx.models.get(&entity).map(|models| models.keys().cloned().collect::<Vec<_>>())
{
for id in ids {
if let Some(mut model) =
cx.models.get_mut(&entity).and_then(|models| models.remove(&id))
{
cx.current = entity;
model.event(cx, event);
cx.models.get_mut(&entity).and_then(|models| models.insert(id, model));
}
}
}
// Return early if the event was consumed by a model
if event.meta.consumed {
return;
}
// Send event to the view attached to the entity
if let Some(mut view) = cx.views.remove(&entity) {
cx.current = entity;
view.event(cx, event);
cx.views.insert(entity, view);
}
}