use std::sync::{Arc, RwLock};
use bevy::{
ecs::{event::ManualEventReader, system::CommandQueue},
prelude::*,
utils::{HashMap, HashSet},
window::PrimaryWindow,
};
use morphorm::Hierarchy;
use crate::{
calculate_nodes::{calculate_layout, calculate_nodes},
children::KChildren,
clone_component::{clone_state, clone_system, EntityCloneSystems, PreviousWidget},
context_entities::ContextEntities,
cursor::PointerEvents,
event_dispatcher::EventDispatcher,
focus_tree::FocusTree,
input::query_world,
layout::{LayoutCache, Rect},
layout_dispatcher::LayoutEventDispatcher,
node::{DirtyNode, Node, WrappedIndex},
prelude::KayakWidgetContext,
render_primitive::RenderPrimitive,
styles::{
ComputedStyles, Corner, Edge, KCursorIcon, KPositionType, KStyle, LayoutType,
RenderCommand, StyleProp, Units,
},
tree::{Change, Tree},
widget_state::WidgetState,
Focusable, KayakUIPlugin, WindowSize,
};
/// A tag component representing when a widget has been mounted(added to the tree).
#[derive(Component, Reflect, Default)]
#[reflect(Component)]
pub struct Mounted;
const UPDATE_DEPTH: u32 = 0;
type WidgetSystems = HashMap<
String,
(
Box<dyn System<In = (KayakWidgetContext, Entity, Entity), Out = bool>>,
Box<dyn System<In = (KayakWidgetContext, Entity), Out = bool>>,
),
>;
///
/// Kayak Context
///
/// This bevy resource keeps track of all of the necessary UI state. This includes the widgets, tree, input, layout, and other important data.
/// The Context provides some connivent helper functions for creating and using widgets, state, and context.
///
/// Usage:
/// ```rust
/// use bevy::prelude::*;
/// use kayak_ui::prelude::{widgets::*, *};
///
/// // Bevy setup function
/// fn setup(mut commands: Commands) {
/// let mut widget_context = Context::new();
/// let app_entity = commands.spawn(KayakAppBundle {
/// ..Default::default()
/// }).id();
/// // Stores the kayak app widget in the widget context's tree.
/// widget_context.add_widget(None, app_entity);
/// commands.spawn((widget_context, EventDispatcher::default()));
/// }
///
/// fn main() {
/// App::new()
/// .add_plugins(DefaultPlugins)
/// .add_plugin(ContextPlugin)
/// .add_plugin(KayakWidgets)
/// .add_startup_system(setup);
/// }
/// ```
#[derive(Component)]
pub struct KayakRootContext {
pub tree: Arc<RwLock<Tree>>,
pub(crate) layout_cache: Arc<RwLock<LayoutCache>>,
pub(crate) focus_tree: Arc<RwLock<FocusTree>>,
systems: WidgetSystems,
pub(crate) current_z: f32,
pub(crate) context_entities: ContextEntities,
pub(crate) current_cursor: CursorIcon,
pub(crate) clone_systems: Arc<RwLock<EntityCloneSystems>>,
pub(crate) cloned_widget_entities: Arc<RwLock<HashMap<Entity, Entity>>>,
pub(crate) widget_state: WidgetState,
pub(crate) order_tree: Arc<RwLock<Tree>>,
pub(crate) index: Arc<RwLock<HashMap<Entity, usize>>>,
pub(crate) uninitilized_systems: HashSet<String>,
pub camera_entity: Entity,
}
impl Default for KayakRootContext {
fn default() -> Self {
Self::new(Entity::from_raw(0))
}
}
impl KayakRootContext {
/// Creates a new widget context.
pub fn new(camera_entity: Entity) -> Self {
Self {
tree: Arc::new(RwLock::new(Tree::default())),
layout_cache: Arc::new(RwLock::new(LayoutCache::default())),
focus_tree: Default::default(),
systems: HashMap::default(),
current_z: 0.0,
context_entities: ContextEntities::new(),
current_cursor: CursorIcon::Default,
clone_systems: Default::default(),
cloned_widget_entities: Default::default(),
widget_state: Default::default(),
index: Default::default(),
order_tree: Default::default(),
uninitilized_systems: Default::default(),
camera_entity,
}
}
/// Adds a kayak plugin and runs the build function on the context.
pub fn add_plugin(&mut self, plugin: impl KayakUIPlugin) {
plugin.build(self)
}
/// Retreives the current entity that has focus or None if nothing is focused.
pub fn get_current_focus(&self) -> Option<Entity> {
if let Ok(tree) = self.focus_tree.try_read() {
return tree.current().and_then(|a| Some(a.0));
}
None
}
/// Get's the layout for th given widget index.
pub(crate) fn get_layout(&self, id: &WrappedIndex) -> Option<Rect> {
if let Ok(cache) = self.layout_cache.try_read() {
cache.rect.get(id).cloned()
} else {
None
}
}
pub(crate) fn get_geometry_changed(&self, id: &WrappedIndex) -> bool {
if let Ok(cache) = self.layout_cache.try_read() {
if let Some(geometry_changed) = cache.geometry_changed.get(id) {
!geometry_changed.is_empty()
} else {
false
}
} else {
false
}
}
/// Adds a new set of systems for a widget type.
/// Update systems are ran every frame and return true or false depending on if the widget has "changed".
/// Render systems are ran only if the widget has changed and are meant to re-render children and handle
/// tree changes.
pub fn add_widget_system<Params, Params2>(
&mut self,
type_name: impl Into<String>,
update: impl IntoSystem<(KayakWidgetContext, Entity, Entity), bool, Params>,
render: impl IntoSystem<(KayakWidgetContext, Entity), bool, Params2>,
) {
let type_name = type_name.into();
let update_system = Box::new(IntoSystem::into_system(update));
let render_system = Box::new(IntoSystem::into_system(render));
self.systems
.insert(type_name.clone(), (update_system, render_system));
self.uninitilized_systems.insert(type_name);
}
/// Let's the widget context know what data types are used for a given widget.
/// This is useful as it allows Kayak to keep track of previous values for diffing.
/// When the default update widget system is called it checks the props and state of
/// the current widget with it's values from the previous frame.
/// This allows Kayak to diff data. Alternatively a custom widget update system can
/// be used and listen for events, resources, or any other bevy ECS data.
pub fn add_widget_data<
Props: Component + Clone + PartialEq,
State: Component + Clone + PartialEq,
>(
&mut self,
) {
if let Ok(mut clone_systems) = self.clone_systems.try_write() {
clone_systems
.0
.push((clone_system::<Props>, clone_state::<State>));
}
}
/// Adds a widget to the tree.
/// Widgets are created using entities and components.
/// Once created their id's need to be added to the widget tree
/// so that the correct ordering is preserved for updates and rendering.
pub fn add_widget(&mut self, parent: Option<Entity>, entity: Entity) {
if let Ok(mut tree) = self.tree.write() {
tree.add(WrappedIndex(entity), parent.map(WrappedIndex));
if let Ok(mut cache) = self.layout_cache.try_write() {
cache.add(WrappedIndex(entity));
}
}
}
/// Creates a new context using the context entity for the given type_id + parent id.
/// Context can be considered state that changes across multiple components.
/// Alternatively you can use bevy's resources.
pub fn set_context_entity<T: Default + 'static>(
&self,
parent_id: Option<Entity>,
context_entity: Entity,
) {
if let Some(parent_id) = parent_id {
self.context_entities
.add_context_entity::<T>(parent_id, context_entity);
}
}
/// Returns a new/existing widget entity.
/// Because a re-render can potentially spawn new entities it's advised to use this
/// to avoid creating a new entity.
///
/// Usage:
/// ```rust
/// fn setup() {
/// let mut widget_context = WidgetContext::new();
/// // Root tree node, no parent node.
/// let root_entity = widget_context.spawn_widget(&mut commands, None);
/// commands.entity(root_entity).insert(KayakAppBundle::default());
/// widget_context.add_widget(None, root_entity);
/// }
///```
pub fn spawn_widget(&self, commands: &mut Commands, parent_id: Option<Entity>) -> Entity {
let mut entity = None;
if let Some(parent_entity) = parent_id {
let children = self.get_children_ordered(parent_entity);
let child = children.get(self.get_and_add_index(parent_entity)).cloned();
if let Some(child) = child {
log::trace!("Reusing widget entity {:?}!", child.index());
entity = Some(commands.get_or_spawn(child).id());
}
}
// If we have no entity spawn it!
if entity.is_none() {
entity = Some(commands.spawn_empty().id());
log::trace!(
"Spawning new widget with entity {:?}!",
entity.unwrap().index()
);
// We need to add it to the ordered tree
if let Ok(mut tree) = self.order_tree.try_write() {
tree.add(WrappedIndex(entity.unwrap()), parent_id.map(WrappedIndex))
}
}
entity.unwrap()
}
fn get_children_ordered(&self, entity: Entity) -> Vec<Entity> {
let mut children = vec![];
if let Ok(tree) = self.order_tree.read() {
let iterator = tree.child_iter(WrappedIndex(entity));
children = iterator.map(|index| index.0).collect::<Vec<_>>();
}
children
}
fn get_and_add_index(&self, parent: Entity) -> usize {
if let Ok(mut hash_map) = self.index.try_write() {
if hash_map.contains_key(&parent) {
let index = hash_map.get_mut(&parent).unwrap();
let current_index = *index;
*index += 1;
return current_index;
} else {
hash_map.insert(parent, 1);
return 0;
}
}
0
}
/// Generates a flat list of widget render commands sorted by tree order.
/// There is no need to call this unless you are implementing your own custom renderer.
pub fn build_render_primitives(
&self,
nodes: &Query<&crate::node::Node>,
widget_names: &Query<&WidgetName>,
) -> Vec<RenderPrimitive> {
let node_tree = self.tree.try_read();
if node_tree.is_err() {
return vec![];
}
let node_tree = node_tree.unwrap();
if node_tree.root_node.is_none() {
return vec![];
}
let render_primitives = if let Ok(mut layout_cache) = self.layout_cache.try_write() {
recurse_node_tree_to_build_primitives(
&node_tree,
&mut layout_cache,
nodes,
widget_names,
node_tree.root_node.unwrap(),
0.0,
RenderPrimitive::Empty,
)
} else {
vec![]
};
// render_primitives.sort_by(|a, b| a.0.partial_cmp(&b.0).unwrap());
// render_primitives.iter().enumerate().for_each(|(index, p)| {
// log::info!("Name: {:?}, Z: {:?}", p.to_string(), index);
// });
// dbg!(&render_primitives
// .iter()
// .map(|a| (a.1.to_string(), a.0))
// .collect::<Vec<_>>());
render_primitives.into_iter().collect()
}
}
fn recurse_node_tree_to_build_primitives(
node_tree: &Tree,
layout_cache: &mut LayoutCache,
nodes: &Query<&crate::node::Node>,
widget_names: &Query<&WidgetName>,
current_node: WrappedIndex,
main_z_index: f32,
mut prev_clip: RenderPrimitive,
) -> Vec<RenderPrimitive> {
let mut render_primitives = Vec::new();
if let Ok(node) = nodes.get(current_node.0) {
let mut render_primitive = node.primitive.clone();
let mut new_z_index = main_z_index;
let layout = if let Some(layout) = layout_cache.rect.get_mut(¤t_node) {
log::trace!(
"z_index is {} and node.z is {} for: {}-{}",
new_z_index,
node.z,
widget_names.get(current_node.0).unwrap().0,
current_node.0.index(),
);
new_z_index += if node.z <= 0.0 { 0.0 } else { node.z };
layout.z_index = new_z_index;
render_primitive.set_layout(*layout);
*layout
} else {
log::warn!(
"No layout for node: {}-{}",
widget_names.get(current_node.0).unwrap().0,
current_node.0.index()
);
Rect::default()
};
match &render_primitive {
RenderPrimitive::Text {
content, layout, ..
} => {
log::trace!(
"Text node: {}-{} is equal to: {}, {:?}",
widget_names.get(current_node.0).unwrap().0,
current_node.0.index(),
content,
layout,
);
}
RenderPrimitive::Clip { layout } => {
log::trace!(
"Clip node: {}-{} is equal to: {:?}",
widget_names.get(current_node.0).unwrap().0,
current_node.0.index(),
layout,
);
}
RenderPrimitive::Empty => {
log::trace!(
"Empty node: {}-{} is equal to: {:?}",
widget_names.get(current_node.0).unwrap().0,
current_node.0.index(),
layout
);
}
_ => {}
}
render_primitives.push(render_primitive.clone());
let new_prev_clip = if matches!(render_primitive, RenderPrimitive::Clip { .. }) {
render_primitive.clone()
} else {
prev_clip
};
prev_clip = new_prev_clip.clone();
if node_tree.children.contains_key(¤t_node) {
let z = 1.0f32;
let mut children_primitives = Vec::new();
for child in node_tree.children.get(¤t_node).unwrap() {
// main_z_index += 1.0;
let mut children_p = recurse_node_tree_to_build_primitives(
node_tree,
layout_cache,
nodes,
widget_names,
*child,
main_z_index + if node.z < 0.0 { 0.0 } else { node.z } + z,
new_prev_clip.clone(),
);
// Between each child node we need to reset the clip.
if matches!(prev_clip, RenderPrimitive::Clip { .. }) {
children_p.push(prev_clip.clone());
}
if let Ok(node) = nodes.get(child.0) {
let zz = if node.z < 0.0 { z } else { z + node.z };
children_primitives.push((zz, children_p));
}
}
// Sort and add
children_primitives.sort_by(|a, b| a.0.partial_cmp(&b.0).unwrap());
for cp in children_primitives.drain(..) {
render_primitives.extend(cp.1);
}
} else {
log::trace!(
"No children for node: {}-{}",
widget_names.get(current_node.0).unwrap().0,
current_node.0.index()
);
}
} else {
log::error!(
"No render node: {}-{} > {}-{}",
node_tree
.get_parent(current_node)
.map(|v| v.0.index() as i32)
.unwrap_or(-1),
widget_names
.get(
node_tree
.get_parent(current_node)
.map(|v| v.0)
.unwrap_or(Entity::from_raw(0))
)
.map(|v| v.0.clone())
.unwrap_or_else(|_| "None".into()),
widget_names
.get(current_node.0)
.map(|v| v.0.clone())
.unwrap_or_else(|_| "None".into()),
current_node.0.index()
);
}
render_primitives
}
fn update_widgets_sys(world: &mut World) {
let mut context_data = Vec::new();
query_world::<Query<(Entity, &mut KayakRootContext)>, _, _>(
|mut query| {
for (entity, mut kayak_root_context) in query.iter_mut() {
context_data.push((entity, std::mem::take(&mut *kayak_root_context)));
}
},
world,
);
for (entity, mut context) in context_data.drain(..) {
for system_id in context.uninitilized_systems.drain() {
if let Some(system) = context.systems.get_mut(&system_id) {
system.0.initialize(world);
system.1.initialize(world);
}
}
let tree_iterator = if let Ok(tree) = context.tree.read() {
tree.down_iter().collect::<Vec<_>>()
} else {
panic!("Failed to acquire read lock.");
};
// let change_tick = world.increment_change_tick();
let old_focus = if let Ok(mut focus_tree) = context.focus_tree.try_write() {
let current = focus_tree.current();
focus_tree.clear();
if let Ok(tree) = context.tree.read() {
if let Some(root_node) = tree.root_node {
focus_tree.add(root_node, &tree);
}
}
current
} else {
None
};
let mut new_ticks = HashMap::new();
// dbg!("Updating widgets!");
update_widgets(
context.camera_entity,
world,
&context.tree,
&context.layout_cache,
&mut context.systems,
tree_iterator,
&context.context_entities,
&context.focus_tree,
&context.clone_systems,
&context.cloned_widget_entities,
&context.widget_state,
&mut new_ticks,
&context.order_tree,
&context.index,
);
if let Some(old_focus) = old_focus {
if let Ok(mut focus_tree) = context.focus_tree.try_write() {
if focus_tree.contains(old_focus) {
focus_tree.focus(old_focus);
}
}
}
// dbg!("Finished updating widgets!");
let tick = world.read_change_tick();
for (key, system) in context.systems.iter_mut() {
if let Some(new_tick) = new_ticks.get(key) {
system.0.set_last_change_tick(*new_tick);
system.1.set_last_change_tick(*new_tick);
} else {
system.0.set_last_change_tick(tick);
system.1.set_last_change_tick(tick);
}
// system.apply_buffers(world);
}
// Clear out indices
if let Ok(mut indices) = context.index.try_write() {
// for (entity, value) in indices.iter_mut() {
// if tree.root_node.unwrap().0.id() != entity.id() {
// *value = 0;
// }
// }
indices.clear();
}
world.entity_mut(entity).insert(context);
}
}
fn update_widgets(
camera_entity: Entity,
world: &mut World,
tree: &Arc<RwLock<Tree>>,
layout_cache: &Arc<RwLock<LayoutCache>>,
systems: &mut WidgetSystems,
widgets: Vec<WrappedIndex>,
context_entities: &ContextEntities,
focus_tree: &Arc<RwLock<FocusTree>>,
clone_systems: &Arc<RwLock<EntityCloneSystems>>,
cloned_widget_entities: &Arc<RwLock<HashMap<Entity, Entity>>>,
widget_state: &WidgetState,
new_ticks: &mut HashMap<String, u32>,
order_tree: &Arc<RwLock<Tree>>,
index: &Arc<RwLock<HashMap<Entity, usize>>>,
) {
for entity in widgets.iter() {
// A small hack to add parents to widgets
// let mut command_queue = CommandQueue::default();
// {
// let mut commands = Commands::new(&mut command_queue, &world);
// if let Some(mut entity_commands) = commands.get_entity(entity.0) {
// entity_commands.set_parent(camera_entity);
// }
// }
// command_queue.apply(world);
if let Some(entity_ref) = world.get_entity(entity.0) {
if let Some(widget_type) = entity_ref.get::<WidgetName>() {
let widget_context = KayakWidgetContext::new(
tree.clone(),
context_entities.clone(),
layout_cache.clone(),
widget_state.clone(),
order_tree.clone(),
index.clone(),
Some(camera_entity),
);
widget_context.copy_from_point(tree, *entity);
let children_before = widget_context.get_children(entity.0);
let widget_name = widget_type.0.clone();
let (widget_context, should_update_children) = update_widget(
systems,
tree,
world,
*entity,
widget_type.0.clone(),
widget_context,
children_before,
clone_systems,
cloned_widget_entities,
widget_state,
new_ticks,
);
if should_update_children {
if let Ok(mut tree) = tree.write() {
// let mut had_removal = false;
let diff = tree.diff_children(&widget_context, *entity, UPDATE_DEPTH);
for (_index, child, _parent, changes) in diff.changes.iter() {
if changes
.iter()
.any(|change| matches!(change, Change::Inserted))
{
if let Ok(mut cache) = layout_cache.try_write() {
cache.add(*child);
}
}
if changes
.iter()
.any(|change| matches!(change, Change::Deleted))
{
// Children of this node need to be despawned.
let mut despawn_list = Vec::default();
for child in tree.down_iter_at(*child, true) {
let children = if let Some(parent) = tree.get_parent(child) {
world.entity(parent.0).get::<KChildren>()
} else {
None
};
if let Some(children) = children {
if !children.iter().any(|c| *c == child.0) {
despawn_list.push(child.0);
}
} else {
despawn_list.push(child.0);
}
if let Ok(mut order_tree) = order_tree.try_write() {
// had_removal = true;
log::trace!(
"Removing entity! {:?} inside of: {}-{:?}",
child.0.index(),
widget_name,
entity.0.index()
);
order_tree.remove(child);
}
}
for entity in despawn_list.drain(..) {
if let Some(entity_mut) = world.get_entity_mut(entity) {
entity_mut.despawn();
}
}
}
}
// if had_removal {
// tree.dump();
// dbg!(&diff);
// }
tree.merge(&widget_context, *entity, diff, UPDATE_DEPTH);
// if had_removal {
// tree.dump();
// }
for child in widget_context.child_iter(*entity) {
if let Some(mut entity_commands) = world.get_entity_mut(child.0) {
entity_commands.insert(DirtyNode);
}
}
}
}
// if should_update_children {
let children = if let Ok(tree) = tree.read() {
tree.child_iter(*entity).collect::<Vec<_>>()
} else {
vec![]
};
update_widgets(
camera_entity,
world,
tree,
layout_cache,
systems,
children,
context_entities,
focus_tree,
clone_systems,
cloned_widget_entities,
widget_state,
new_ticks,
order_tree,
index,
);
// }
}
} else {
// In this case the entity we are trying to process no longer exists.
// The approach taken here removes said entities from the tree.
let mut despawn_list = Vec::default();
if let Ok(mut tree) = tree.write() {
for child in tree.down_iter_at(*entity, true) {
despawn_list.push(child.0);
if let Ok(mut order_tree) = order_tree.try_write() {
// had_removal = true;
log::trace!(
"Removing entity! {:?} inside of: {:?}",
child.0.index(),
entity.0.index()
);
order_tree.remove(child);
}
}
for entity in despawn_list.drain(..) {
tree.remove(WrappedIndex(entity));
if let Some(entity_mut) = world.get_entity_mut(entity) {
entity_mut.despawn();
}
}
}
}
if let Some(entity_ref) = world.get_entity(entity.0) {
if entity_ref.contains::<Focusable>() {
if let Ok(tree) = tree.try_read() {
if let Ok(mut focus_tree) = focus_tree.try_write() {
focus_tree.add(*entity, &tree);
}
}
}
}
}
}
fn update_widget(
systems: &mut WidgetSystems,
tree: &Arc<RwLock<Tree>>,
world: &mut World,
entity: WrappedIndex,
widget_type: String,
widget_context: KayakWidgetContext,
previous_children: Vec<Entity>,
clone_systems: &Arc<RwLock<EntityCloneSystems>>,
cloned_widget_entities: &Arc<RwLock<HashMap<Entity, Entity>>>,
widget_state: &WidgetState,
new_ticks: &mut HashMap<String, u32>,
) -> (Tree, bool) {
// Check if we should update this widget
let should_rerender = {
let old_props_entity =
if let Ok(mut cloned_widget_entities) = cloned_widget_entities.try_write() {
if let Some(entity) = cloned_widget_entities.get(&entity.0).cloned() {
if let Some(possible_entity) = world.get_entity(entity) {
let target = possible_entity.id();
cloned_widget_entities.insert(entity, target);
target
} else {
let target = world.spawn_empty().insert(PreviousWidget).id();
cloned_widget_entities.insert(entity, target);
target
}
} else {
let target = world.spawn_empty().insert(PreviousWidget).id();
cloned_widget_entities.insert(entity.0, target);
target
}
} else {
panic!("Couldn't get write lock!")
};
let widget_update_system = &mut systems
.get_mut(&widget_type)
.expect(&format!(
"Wasn't able to find render/update systems for widget: {}!",
widget_type
))
.0;
let old_tick = widget_update_system.get_last_change_tick();
let should_rerender =
widget_update_system.run((widget_context.clone(), entity.0, old_props_entity), world);
let new_tick = widget_update_system.get_last_change_tick();
new_ticks.insert(widget_type.clone(), new_tick);
widget_update_system.set_last_change_tick(old_tick);
widget_update_system.apply_buffers(world);
if should_rerender {
if let Ok(cloned_widget_entities) = cloned_widget_entities.try_read() {
if let Some(target_entity) = cloned_widget_entities.get(&entity.0) {
if let Ok(clone_systems) = clone_systems.try_read() {
for s in clone_systems.0.iter() {
s.0(world, *target_entity, entity.0);
s.1(world, *target_entity, entity.0, widget_state);
if let Some(styles) = world.entity(entity.0).get::<KStyle>().cloned() {
if let Some(mut entity) = world.get_entity_mut(*target_entity) {
entity.insert(styles);
}
}
if let Some(styles) =
world.entity(entity.0).get::<ComputedStyles>().cloned()
{
if let Some(mut entity) = world.get_entity_mut(*target_entity) {
entity.insert(styles);
}
}
if let Some(children) =
world.entity(entity.0).get::<KChildren>().cloned()
{
if let Some(mut entity) = world.get_entity_mut(*target_entity) {
entity.insert(children);
}
}
}
}
}
}
}
should_rerender
};
if !should_rerender {
return (widget_context.take(), false);
}
// if let Ok(tree) = tree.try_read() {
// if tree.root_node.unwrap() != entity {
// }
let should_update_children;
if let Ok(tree) = tree.try_read() {
log::trace!(
"Re-rendering: {:?} {:?}, parent: {:?}",
&widget_type,
entity.0.index(),
tree.parent(entity)
.unwrap_or(WrappedIndex(Entity::from_raw(99999)))
.0
.index()
);
}
{
// Before rendering widget we need to advance the indices correctly..
if let Some(children) = world.get::<KChildren>(entity.0) {
let child_count = children.len();
if let Ok(mut indices) = widget_context.index.try_write() {
indices.insert(entity.0, 0);
log::trace!(
"Advancing children for: {:?} by: {:?}",
entity.0.index(),
child_count
);
}
}
// Remove children from previous render.
widget_context.remove_children(previous_children);
let widget_render_system = &mut systems.get_mut(&widget_type).unwrap().1;
let old_tick = widget_render_system.get_last_change_tick();
should_update_children =
widget_render_system.run((widget_context.clone(), entity.0), world);
let new_tick = widget_render_system.get_last_change_tick();
new_ticks.insert(widget_type.clone(), new_tick);
widget_render_system.set_last_change_tick(old_tick);
widget_render_system.apply_buffers(world);
if let Ok(mut indices) = widget_context.index.try_write() {
indices.insert(entity.0, 0);
}
}
let widget_context = widget_context.take();
let mut command_queue = CommandQueue::default();
let mut commands = Commands::new(&mut command_queue, world);
commands.entity(entity.0).remove::<Mounted>();
let diff = if let Ok(tree) = tree.read() {
tree.diff_children(&widget_context, entity, UPDATE_DEPTH)
} else {
panic!("Failed to acquire read lock.");
};
log::trace!("Diff: {:?}", &diff);
// Always mark widget dirty if it's re-rendered.
// Mark node as needing a recalculation of rendering/layout.
commands.entity(entity.0).insert(DirtyNode);
for (_index, changed_entity, parent, changes) in diff.changes.iter() {
if changes.iter().any(|change| *change == Change::Deleted) {
// commands.entity(changed_entity.0).despawn();
// commands.entity(changed_entity.0).remove::<DirtyNode>();
// commands.entity(changed_entity.0).despawn_recursive();
}
if changes.iter().any(|change| *change == Change::Inserted) {
if let Some(mut entity_commands) = commands.get_entity(changed_entity.0) {
entity_commands.insert(Mounted);
entity_commands.set_parent(parent.0);
}
if let Some(mut parent_commands) = commands.get_entity(parent.0) {
parent_commands.add_child(changed_entity.0);
}
}
}
command_queue.apply(world);
if should_update_children {
if let Ok(cloned_widget_entities) = cloned_widget_entities.try_read() {
if let Some(target_entity) = cloned_widget_entities.get(&entity.0) {
if let Some(styles) = world.entity(entity.0).get::<KStyle>().cloned() {
if let Some(mut entity) = world.get_entity_mut(*target_entity) {
entity.insert(styles);
}
}
if let Some(styles) = world.entity(entity.0).get::<ComputedStyles>().cloned() {
if let Some(mut entity) = world.get_entity_mut(*target_entity) {
entity.insert(styles);
}
}
if let Some(children) = world.entity(entity.0).get::<KChildren>().cloned() {
if let Some(mut entity) = world.get_entity_mut(*target_entity) {
entity.insert(children);
}
}
}
}
for (_, child_entity, _, changes) in diff.changes.iter() {
// Clone to entity.
if changes.iter().any(|change| *change == Change::Deleted) {
if let Ok(cloned_widget_entities) = cloned_widget_entities.try_read() {
if let Some(entity) = cloned_widget_entities.get(&child_entity.0) {
world.despawn(*entity);
}
}
}
}
}
(widget_context, should_update_children)
}
/// The default Kayak Context plugin
/// Creates systems and resources for kayak.
pub struct KayakContextPlugin;
#[derive(Resource)]
pub struct CustomEventReader<T: bevy::ecs::event::Event>(pub ManualEventReader<T>);
impl Plugin for KayakContextPlugin {
fn build(&self, app: &mut App) {
app.insert_resource(WindowSize::default())
.insert_resource(CustomEventReader(ManualEventReader::<
bevy::window::CursorMoved,
>::default()))
.insert_resource(CustomEventReader(ManualEventReader::<
bevy::input::mouse::MouseButtonInput,
>::default()))
.insert_resource(CustomEventReader(ManualEventReader::<
bevy::input::mouse::MouseWheel,
>::default()))
.insert_resource(CustomEventReader(ManualEventReader::<
bevy::window::ReceivedCharacter,
>::default()))
.insert_resource(CustomEventReader(ManualEventReader::<
bevy::input::keyboard::KeyboardInput,
>::default()))
.add_plugin(crate::camera::KayakUICameraPlugin)
.add_plugin(crate::render::BevyKayakUIRenderPlugin)
.register_type::<Node>()
.add_system(crate::input::process_events.in_base_set(CoreSet::Update))
.add_system(update_widgets_sys.in_base_set(CoreSet::PostUpdate))
.add_system(
calculate_ui
.after(update_widgets_sys)
.in_base_set(CoreSet::PostUpdate),
);
// .add_system(crate::window_size::update_window_size);
// Register reflection types.
// A bit annoying..
app.register_type::<ComputedStyles>()
.register_type::<KStyle>()
.register_type::<KChildren>()
.register_type::<WidgetName>()
.register_type::<StyleProp<Color>>()
.register_type::<StyleProp<Corner<f32>>>()
.register_type::<StyleProp<Edge<f32>>>()
.register_type::<StyleProp<Units>>()
.register_type::<StyleProp<KCursorIcon>>()
.register_type::<StyleProp<String>>()
.register_type::<StyleProp<f32>>()
.register_type::<StyleProp<LayoutType>>()
.register_type::<StyleProp<Edge<Units>>>()
.register_type::<StyleProp<PointerEvents>>()
.register_type::<StyleProp<KPositionType>>()
.register_type::<StyleProp<RenderCommand>>()
.register_type::<StyleProp<i32>>();
}
}
pub use crate::window_size::update_window_size;
fn calculate_ui(world: &mut World) {
// dbg!("Calculating nodes!");
let mut context_data = Vec::new();
query_world::<Query<(Entity, &mut EventDispatcher, &mut KayakRootContext)>, _, _>(
|mut query| {
for (entity, mut event_dispatcher, mut kayak_root_context) in query.iter_mut() {
context_data.push((
entity,
std::mem::take(&mut *event_dispatcher),
std::mem::take(&mut *kayak_root_context),
));
}
},
world,
);
for (entity, event_dispatcher, mut context) in context_data.drain(..) {
let mut node_system = IntoSystem::into_system(calculate_nodes);
node_system.initialize(world);
let mut layout_system = IntoSystem::into_system(calculate_layout);
layout_system.initialize(world);
for _ in 0..3 {
context = node_system.run(context, world);
node_system.apply_buffers(world);
context = layout_system.run(context, world);
layout_system.apply_buffers(world);
LayoutEventDispatcher::dispatch(&mut context, world);
}
if event_dispatcher.hovered.is_none() {
context.current_cursor = CursorIcon::Default;
} else {
let hovered = event_dispatcher.hovered.unwrap();
if let Some(entity) = world.get_entity(hovered.0) {
if let Some(node) = entity.get::<crate::node::Node>() {
let icon = node.resolved_styles.cursor.resolve();
context.current_cursor = icon.0;
}
}
if let Ok(mut window) = world
.query_filtered::<&mut Window, With<PrimaryWindow>>()
.get_single_mut(world)
{
window.cursor.icon = context.current_cursor;
}
}
world.entity_mut(entity).insert((event_dispatcher, context));
}
// dbg!("Finished calculating nodes!");
// dbg!("Dispatching layout events!");
// dbg!("Finished dispatching layout events!");
}
/// A simple component that stores the type name of a widget
/// This is used by Kayak in order to find out which systems to run.
#[derive(Component, Reflect, Debug, Clone, PartialEq, Eq)]
#[reflect(Component)]
pub struct WidgetName(pub String);
impl Default for WidgetName {
fn default() -> Self {
log::warn!("You did not specify a widget name for a widget!");
Self("NO_NAME".to_string())
}
}
impl From<String> for WidgetName {
fn from(value: String) -> Self {
WidgetName(value)
}
}
impl Into<String> for WidgetName {
fn into(self) -> String {
self.0
}
}