implement listeners for Button component back

wgui/src/components/button.rs

@@ -2,10 +2,10 @@ use std::sync::Arc;
 use taffy::{AlignItems, JustifyContent, prelude::length};
 
 use crate::{
-	animation::{Animation, AnimationEasing},
+	animation::{self, Animation, AnimationEasing},
 	components::Component,
 	drawing::{self, Color},
-	event::WidgetCallback,
+	event::{EventListenerCollection, EventListenerKind, WidgetCallback},
 	layout::{Layout, WidgetID},
 	renderer_vk::text::{FontWeight, TextStyle},
 	widget::{
@@ -38,7 +38,8 @@ impl Default for Params<'_> {
 }
 
 pub struct Button {
-	pub color: drawing::Color,
+	initial_color: drawing::Color,
+	initial_border_color: drawing::Color,
 	pub body: WidgetID,    // Rectangle
 	pub text_id: WidgetID, // Text
 	text_node: taffy::NodeId,
@@ -59,6 +60,18 @@ impl Button {
 	}
 }
 
+fn anim_hover(rect: &mut Rectangle, button: &Button, pos: f32) {
+	let brightness = pos * 0.5;
+	let border_brightness = pos;
+	rect.params.color.r = button.initial_color.r + brightness;
+	rect.params.color.g = button.initial_color.g + brightness;
+	rect.params.color.b = button.initial_color.b + brightness;
+	rect.params.border_color.r = button.initial_border_color.r + border_brightness;
+	rect.params.border_color.g = button.initial_border_color.g + border_brightness;
+	rect.params.border_color.b = button.initial_border_color.b + border_brightness;
+	rect.params.border = 3.0;
+}
+
 fn anim_hover_in(button: Arc<Button>, widget_id: WidgetID) -> Animation {
 	Animation::new(
 		widget_id,
@@ -66,12 +79,7 @@ fn anim_hover_in(button: Arc<Button>, widget_id: WidgetID) -> Animation {
 		AnimationEasing::OutQuad,
 		Box::new(move |data| {
 			let rect = data.obj.get_as_mut::<Rectangle>();
-			let brightness = data.pos * 0.5;
-			rect.params.color.r = button.color.r + brightness;
-			rect.params.color.g = button.color.g + brightness;
-			rect.params.color.b = button.color.b + brightness;
-			rect.params.border_color = Color::new(1.0, 1.0, 1.0, 1.0);
-			rect.params.border = 1.0 + data.pos;
+			anim_hover(rect, &button, data.pos);
 			data.needs_redraw = true;
 		}),
 	)
@@ -84,12 +92,7 @@ fn anim_hover_out(button: Arc<Button>, widget_id: WidgetID) -> Animation {
 		AnimationEasing::OutQuad,
 		Box::new(move |data| {
 			let rect = data.obj.get_as_mut::<Rectangle>();
-			let brightness = (1.0 - data.pos) * 0.5;
-			rect.params.color.r = button.color.r + brightness;
-			rect.params.color.g = button.color.g + brightness;
-			rect.params.color.b = button.color.b + brightness;
-			rect.params.border_color = Color::new(1.0, 1.0, 1.0, 1.0);
-			rect.params.border = 1.0 + (1.0 - data.pos) * 2.0;
+			anim_hover(rect, &button, 1.0 - data.pos);
 			data.needs_redraw = true;
 		}),
 	)
@@ -97,6 +100,7 @@ fn anim_hover_out(button: Arc<Button>, widget_id: WidgetID) -> Animation {
 
 pub fn construct(
 	layout: &mut Layout,
+	listeners: &mut EventListenerCollection<(), ()>,
 	parent: WidgetID,
 	params: Params,
 ) -> anyhow::Result<Arc<Button>> {
@@ -142,14 +146,35 @@ pub fn construct(
 
 	let button = Arc::new(Button {
 		body: rect_id,
-		color: params.color,
 		text_id,
 		text_node,
+		initial_color: params.color,
+		initial_border_color: params.border_color,
 	});
 
-	//TODO: Highlight background on mouse enter
+	//let mut widget = layout.widget_map.get(rect_id).unwrap().lock().unwrap();
 
-	//TODO: Bring back old color on mouse leave
+	let _button = button.clone();
+	listeners.add(
+		rect_id,
+		EventListenerKind::MouseEnter,
+		Box::new(move |data, _, _| {
+			data
+				.animations
+				.push(anim_hover_in(_button.clone(), data.widget_id));
+		}),
+	);
+
+	let _button = button.clone();
+	listeners.add(
+		rect_id,
+		EventListenerKind::MouseLeave,
+		Box::new(move |data, _, _| {
+			data
+				.animations
+				.push(anim_hover_out(_button.clone(), data.widget_id));
+		}),
+	);
 
 	Ok(button)
 }

wgui/src/parser/component_button.rs

@@ -45,6 +45,7 @@ pub fn parse_component_button<'a>(
 
 	let button = button::construct(
 		ctx.layout,
+		ctx.listeners,
 		parent_id,
 		button::Params {
 			color,

wgui/src/parser/mod.rs

@@ -8,6 +8,7 @@ mod widget_sprite;
 use crate::{
 	assets::AssetProvider,
 	drawing::{self},
+	event::EventListenerCollection,
 	layout::{Layout, WidgetID},
 	parser::{
 		component_button::parse_component_button, widget_div::parse_widget_div,
@@ -62,6 +63,7 @@ impl ParserResult {
 		&mut self,
 		template_name: &str,
 		layout: &mut Layout,
+		listeners: &mut EventListenerCollection<(), ()>,
 		widget_id: WidgetID,
 		template_parameters: HashMap<Rc<str>, Rc<str>>,
 	) -> anyhow::Result<()> {
@@ -71,6 +73,7 @@ impl ParserResult {
 
 		let mut ctx = ParserContext {
 			layout,
+			listeners,
 			ids: Default::default(),
 			macro_attribs: self.macro_attribs.clone(), // FIXME: prevent copying
 			var_map: self.var_map.clone(),             // FIXME: prevent copying
@@ -107,6 +110,7 @@ struct MacroAttribs {
 
 struct ParserContext<'a> {
 	layout: &'a mut Layout,
+	listeners: &'a mut EventListenerCollection<(), ()>,
 	var_map: HashMap<Rc<str>, Rc<str>>,
 	macro_attribs: HashMap<Rc<str>, MacroAttribs>,
 	ids: HashMap<Rc<str>, WidgetID>,
@@ -557,9 +561,13 @@ fn parse_children<'a>(
 	Ok(())
 }
 
-fn create_default_context(layout: &mut Layout) -> ParserContext<'_> {
+fn create_default_context<'a>(
+	layout: &'a mut Layout,
+	listeners: &'a mut EventListenerCollection<(), ()>,
+) -> ParserContext<'a> {
 	ParserContext {
 		layout,
+		listeners,
 		ids: Default::default(),
 		var_map: Default::default(),
 		templates: Default::default(),
@@ -569,12 +577,13 @@ fn create_default_context(layout: &mut Layout) -> ParserContext<'_> {
 
 pub fn parse_from_assets(
 	layout: &mut Layout,
+	listeners: &mut EventListenerCollection<(), ()>,
 	parent_id: WidgetID,
 	path: &str,
 ) -> anyhow::Result<ParserResult> {
 	let path = PathBuf::from(path);
 
-	let mut ctx = create_default_context(layout);
+	let mut ctx = create_default_context(layout, listeners);
 
 	let (file, node_layout) = get_doc_from_path(&mut ctx, &path)?;
 	parse_document_root(file, &mut ctx, parent_id, node_layout)?;
@@ -595,11 +604,12 @@ pub fn parse_from_assets(
 
 pub fn new_layout_from_assets(
 	assets: Box<dyn AssetProvider>,
+	listeners: &mut EventListenerCollection<(), ()>,
 	path: &str,
 ) -> anyhow::Result<(Layout, ParserResult)> {
 	let mut layout = Layout::new(assets)?;
 	let widget = layout.root_widget;
-	let state = parse_from_assets(&mut layout, widget, path)?;
+	let state = parse_from_assets(&mut layout, listeners, widget, path)?;
 	Ok((layout, state))
 }