WIP conversion to messages

editor/src/tool/snapping.rs

@@ -1,5 +1,6 @@
-use std::f64::consts::PI;
+use std::{collections::HashMap, f64::consts::PI};
 
+use super::DocumentMessageHandler;
 use glam::{DAffine2, DVec2};
 use graphene::{
 	layers::style::{self, Stroke},
@@ -11,41 +12,40 @@ use crate::{
 	message_prelude::*,
 };
 
-use super::DocumentMessageHandler;
-
 #[derive(Debug, Clone, Default)]
 pub struct SnapHandler {
+	enabled: bool,
+	document: DocumentMessageHandler,
 	snap_targets: Option<(Vec<f64>, Vec<f64>)>,
+	snappables: HashMap<Vec<LayerId>, Vec<Vec<LayerId>>>,
+	overlay_messages: Vec<Message>,
+
 	overlay_paths: Vec<Vec<LayerId>>,
 }
 
 impl SnapHandler {
-	fn add_overlays(&mut self, responses: &mut VecDeque<Message>, viewport_bounds: DVec2) {
-		fn add_overlay_line(responses: &mut VecDeque<Message>, transform: DAffine2) -> Vec<LayerId> {
-			let layer_path = vec![generate_uuid()];
+	fn add_overlay_line(&mut self, transform: DAffine2) -> Vec<LayerId> {
+		let layer_path = vec![generate_uuid()];
 
-			let operation = Operation::AddOverlayLine {
-				path: layer_path.clone(),
-				transform: transform.to_cols_array(),
-				style: style::PathStyle::new(Some(Stroke::new(COLOR_ACCENT, 1.0)), None),
-			};
-			responses.push_back(DocumentMessage::Overlay(operation.into()).into());
+		let operation = Operation::AddOverlayLine {
+			path: layer_path.clone(),
+			transform: transform.to_cols_array(),
+			style: style::PathStyle::new(Some(Stroke::new(COLOR_ACCENT, 1.0)), None),
+		};
+		self.overlay_messages.push(DocumentMessage::Overlay(operation.into()).into());
 
-			layer_path
-		}
+		layer_path
+	}
 
+	fn add_overlays(&mut self, viewport_bounds: DVec2) {
 		if let Some((x_targets, y_targets)) = &self.snap_targets {
 			for x_target in x_targets {
-				self.overlay_paths.push(add_overlay_line(
-					responses,
-					DAffine2::from_scale_angle_translation(DVec2::new(viewport_bounds.y, 1.), PI / 2., DVec2::new(x_target.round(), 0.)),
-				));
+				self.overlay_paths
+					.push(self.add_overlay_line(DAffine2::from_scale_angle_translation(DVec2::new(viewport_bounds.y, 1.), PI / 2., DVec2::new(x_target.round(), 0.))));
 			}
 			for y_target in y_targets {
-				self.overlay_paths.push(add_overlay_line(
-					responses,
-					DAffine2::from_scale_angle_translation(DVec2::new(viewport_bounds.x, 1.), 0., DVec2::new(0., y_target.round())),
-				));
+				self.overlay_paths
+					.push(self.add_overlay_line(DAffine2::from_scale_angle_translation(DVec2::new(viewport_bounds.x, 1.), 0., DVec2::new(0., y_target.round()))));
 			}
 		}
 	}
@@ -58,29 +58,30 @@ impl SnapHandler {
 
 	/// Gets a list of snap targets for the X and Y axes in Viewport coords for the target layers (usually all layers or all non-selected layers.)
 	/// This should be called at the start of a drag.
-	pub fn start_snap(&mut self, responses: &mut VecDeque<Message>, viewport_bounds: DVec2, document_message_handler: &DocumentMessageHandler, target_layers: Vec<Vec<LayerId>>) {
-		if document_message_handler.snapping_enabled {
+	pub fn start_snap(&mut self, viewport_bounds: DVec2, target_layers: Vec<Vec<LayerId>>) {
+		if self.document.snapping_enabled {
 			// Could be made into sorted Vec or a HashSet for more performant lookups.
 			self.snap_targets = Some(
 				target_layers
 					.iter()
-					.filter_map(|path| document_message_handler.graphene_document.viewport_bounding_box(path).ok()?)
+					.filter_map(|path| self.document.graphene_document.viewport_bounding_box(path).ok()?)
 					.flat_map(|[bound1, bound2]| [bound1, bound2, ((bound1 + bound2) / 2.)])
 					.map(|vec| vec.into())
 					.unzip(),
 			);
-			self.add_overlays(responses, viewport_bounds);
+			self.add_overlays(viewport_bounds);
 		}
 	}
 
 	/// Finds the closest snap from an array of layers to the specified snap targets in viewport coords.
 	/// Returns 0 for each axis that there is no snap less than the snap tolerance.
-	pub fn snap_layers(&self, document_message_handler: &DocumentMessageHandler, selected_layers: &[Vec<LayerId>], mouse_delta: DVec2) -> DVec2 {
-		if document_message_handler.snapping_enabled {
+	pub fn snap_layers(&self, mouse_delta: DVec2) -> DVec2 {
+		if self.enabled {
 			if let Some((targets_x, targets_y)) = &self.snap_targets {
-				let (snap_x, snap_y): (Vec<f64>, Vec<f64>) = selected_layers
+				let (snap_x, snap_y): (Vec<f64>, Vec<f64>) = self
+					.snappables
 					.iter()
-					.filter_map(|path| document_message_handler.graphene_document.viewport_bounding_box(path).ok()?)
+					.filter_map(|(path, _)| self.document.graphene_document.viewport_bounding_box(path).ok()?)
 					.flat_map(|[bound1, bound2]| [bound1, bound2, (bound1 + bound2) / 2.])
 					.map(|vec| vec.into())
 					.unzip();
@@ -112,8 +113,8 @@ impl SnapHandler {
 	}
 
 	/// Handles snapping of a viewport position, returning another viewport position.
-	pub fn snap_position(&self, document_message_handler: &DocumentMessageHandler, position_viewport: DVec2) -> DVec2 {
-		if document_message_handler.snapping_enabled {
+	pub fn snap_position(&self, position_viewport: DVec2) -> DVec2 {
+		if self.document.snapping_enabled {
 			if let Some((targets_x, targets_y)) = &self.snap_targets {
 				// For each list of snap targets, find the shortest distance to move the point to that target.
 				let closest_move = DVec2::new(
@@ -148,4 +149,18 @@ impl SnapHandler {
 		self.remove_overlays(responses);
 		self.snap_targets = None;
 	}
+
+	// ---
+	pub fn add_snappable(&mut self, layer: Vec<LayerId>) {
+		self.snappables.insert(layer, vec![]);
+	}
+
+	pub fn remove_snappable(&mut self, layer: Vec<LayerId>) {
+		self.snappables.remove(&layer);
+	}
+
+	pub fn process_overlays(&mut self, responses: &mut VecDeque<Message>) {
+		responses.extend(self.overlay_messages.into_iter());
+		self.overlay_messages.clear();
+	}
 }

editor/src/tool/tool_message_handler.rs

@@ -1,4 +1,5 @@
 use crate::message_prelude::*;
+use glam::DVec2;
 use graphene::color::Color;
 
 use crate::input::InputPreprocessor;
@@ -21,6 +22,10 @@ pub enum ToolMessage {
 	DocumentIsDirty,
 	UpdateHints,
 	SetToolOptions(ToolType, ToolOptions),
+	SetSnapping(bool),
+	AddSnappable(Vec<LayerId>),
+	RemoveSnappable(Vec<LayerId>),
+	SnapLayer(Vec<LayerId>),
 	#[child]
 	Fill(FillMessage),
 	#[child]