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#![allow(clippy::type_complexity)]
use freya_engine::prelude::Color;
use freya_native_core::{
events::EventName,
prelude::NodeImmutable,
NodeId,
};
use rustc_hash::FxHashMap;
use super::PlatformEventData;
use crate::{
dom::FreyaDOM,
events::{
is_node_parent_of,
DomEvent,
PlatformEvent,
PotentialEvent,
},
states::StyleState,
types::PotentialEvents,
values::Fill,
};
#[derive(Clone, Debug)]
struct NodeMetadata {
layer: Option<i16>,
}
/// [`NodesState`] stores the nodes states given incoming events.
#[derive(Default)]
pub struct NodesState {
pressed_nodes: FxHashMap<NodeId, NodeMetadata>,
hovered_nodes: FxHashMap<NodeId, NodeMetadata>,
}
impl NodesState {
/// Update the node states given the new events and suggest potential collateral new events
pub fn process_collateral(
&mut self,
fdom: &FreyaDOM,
potential_events: &PotentialEvents,
dom_events: &mut Vec<DomEvent>,
events: &[PlatformEvent],
) -> PotentialEvents {
let rdom = fdom.rdom();
let layout = fdom.layout();
let mut potential_collateral_events = PotentialEvents::default();
// Any mouse press event at all
let recent_mouse_press_event = any_event_of(events, |e| e.is_pressed());
// Pressed Nodes
#[allow(unused_variables)]
self.pressed_nodes.retain(|node_id, _| {
// Check if a DOM event that presses this Node will get emitted
let no_desire_to_press = filter_dom_events_by(dom_events, node_id, |e| e.is_pressed());
// If there has been a mouse press but a DOM event was not emitted to this node, then we safely assume
// the user does no longer want to press this Node
if no_desire_to_press && recent_mouse_press_event.is_some() {
#[cfg(debug_assertions)]
tracing::info!("Unmarked as pressed {:?}", node_id);
// Remove the node from the list of pressed nodes
return false;
}
true
});
// Any mouse movement event at all
let recent_mouse_movement_event = any_event_of(events, |e| e.is_moved());
// Hovered Nodes
self.hovered_nodes.retain(|node_id, metadata| {
// Check if a DOM event that moves the cursor in this Node will get emitted
let no_desire_to_hover = filter_dom_events_by(dom_events, node_id, |e| e.is_moved());
if no_desire_to_hover {
// If there has been a mouse movement but a DOM event was not emitted to this node, then we safely assume
// the user does no longer want to hover this Node
if let Some(PlatformEventData::Mouse { cursor, button, .. }) =
recent_mouse_movement_event
{
if layout.get(*node_id).is_some() {
let events = potential_collateral_events
.entry(EventName::MouseLeave)
.or_default();
// Emit a MouseLeave event as the cursor was moved outside the Node bounds
events.push(PotentialEvent {
node_id: *node_id,
layer: metadata.layer,
name: EventName::MouseLeave,
data: PlatformEventData::Mouse { cursor, button },
});
#[cfg(debug_assertions)]
tracing::info!("Unmarked as hovered {:?}", node_id);
}
// Remove the node from the list of hovered nodes
return false;
}
}
true
});
dom_events.retain(|ev| {
match ev.name {
// Only let through enter events when the node was not hovered
_ if ev.name.is_enter() => !self.hovered_nodes.contains_key(&ev.node_id),
// Only let through release events when the node was already pressed
_ if ev.name.is_released() => self.pressed_nodes.contains_key(&ev.node_id),
_ => true,
}
});
// Update the state of the nodes given the new events.
for events in potential_events.values() {
let mut child_node: Option<NodeId> = None;
for PotentialEvent {
node_id,
name,
layer,
..
} in events.iter().rev()
{
if let Some(child_node) = child_node {
if !is_node_parent_of(rdom, child_node, *node_id) {
continue;
}
}
let node = rdom.get(*node_id).unwrap();
let StyleState { background, .. } = &*node.get::<StyleState>().unwrap();
if background != &Fill::Color(Color::TRANSPARENT) && !name.does_go_through_solid() {
// If the background isn't transparent,
// we must make sure that next nodes are parent of it
// This only matters for events that bubble up (e.g. cursor click events)
child_node = Some(*node_id);
}
match name {
// Update hovered nodes state
name if name.is_hovered() => {
// Mark the Node as hovered if it wasn't already
self.hovered_nodes.entry(*node_id).or_insert_with(|| {
#[cfg(debug_assertions)]
tracing::info!("Marked as hovered {:?}", node_id);
NodeMetadata { layer: *layer }
});
}
// Update pressed nodes state
name if name.is_pressed() => {
// Mark the Node as pressed if it wasn't already
self.pressed_nodes.entry(*node_id).or_insert_with(|| {
#[cfg(debug_assertions)]
tracing::info!("Marked as pressed {:?}", node_id);
NodeMetadata { layer: *layer }
});
}
_ => {}
}
}
}
// Order the events by their Nodes layer
for events in potential_collateral_events.values_mut() {
events.sort_by(|left, right| left.layer.cmp(&right.layer))
}
potential_collateral_events
}
}
fn any_event_of(
events: &[PlatformEvent],
filter: impl Fn(EventName) -> bool,
) -> Option<PlatformEventData> {
events
.iter()
.find_map(|event| {
if filter(event.name) {
Some(&event.data)
} else {
None
}
})
.cloned()
}
fn filter_dom_events_by(
events_to_emit: &[DomEvent],
node_id: &NodeId,
filter: impl Fn(EventName) -> bool,
) -> bool {
events_to_emit
.iter()
.find_map(|event| {
if filter(event.name) && &event.node_id == node_id {
Some(false)
} else {
None
}
})
.unwrap_or(true)
}