Implement fill tool (#254)

* Implement fill tool

* Add fill tool shortcut

* Add getters and setters to styles

* Make fill tool act on the topmost layer clicked

* Refactor fill operation

* Refactor and unify selection tolerance

* Add mark_as_dirty function

* Fix getter names

core/editor/src/consts.rs

@@ -10,3 +10,5 @@ pub const WHEEL_ZOOM_RATE: f64 = 1. / 600.;
 pub const MOUSE_ZOOM_RATE: f64 = 1. / 400.;
 
 pub const ROTATE_SNAP_INTERVAL: f64 = 15.;
+
+pub const SELECTION_TOLERANCE: f64 = 5.0;

core/editor/src/input/input_mapper.rs

@@ -169,7 +169,10 @@ impl Default for Mapping {
 			entry! {action=PenMessage::Confirm, key_down=Rmb},
 			entry! {action=PenMessage::Confirm, key_down=KeyEscape},
 			entry! {action=PenMessage::Confirm, key_down=KeyEnter},
+			// Fill
+			entry! {action=FillMessage::MouseDown, key_down=Lmb},
 			// Tool Actions
+			entry! {action=ToolMessage::SelectTool(ToolType::Fill), key_down=KeyF},
 			entry! {action=ToolMessage::SelectTool(ToolType::Rectangle), key_down=KeyM},
 			entry! {action=ToolMessage::SelectTool(ToolType::Ellipse), key_down=KeyE},
 			entry! {action=ToolMessage::SelectTool(ToolType::Select), key_down=KeyV},

core/editor/src/lib.rs

@@ -60,6 +60,7 @@ pub mod message_prelude {
 	pub use super::tool::tool_messages::*;
 	pub use super::tool::tools::crop::{CropMessage, CropMessageDiscriminant};
 	pub use super::tool::tools::eyedropper::{EyedropperMessage, EyedropperMessageDiscriminant};
+	pub use super::tool::tools::fill::{FillMessage, FillMessageDiscriminant};
 	pub use super::tool::tools::line::{LineMessage, LineMessageDiscriminant};
 	pub use super::tool::tools::navigate::{NavigateMessage, NavigateMessageDiscriminant};
 	pub use super::tool::tools::path::{PathMessage, PathMessageDiscriminant};

core/editor/src/tool/mod.rs

@@ -83,6 +83,7 @@ impl Default for ToolFsmState {
 					Line => line::Line,
 					Shape => shape::Shape,
 					Ellipse => ellipse::Ellipse,
+					Fill => fill::Fill,
 				},
 			},
 			document_tool_data: DocumentToolData {

core/editor/src/tool/tool_message_handler.rs

@@ -17,6 +17,8 @@ pub enum ToolMessage {
 	SwapColors,
 	ResetColors,
 	#[child]
+	Fill(FillMessage),
+	#[child]
 	Rectangle(RectangleMessage),
 	#[child]
 	Ellipse(EllipseMessage),
@@ -89,6 +91,7 @@ impl MessageHandler<ToolMessage, (&SvgDocument, &InputPreprocessor)> for ToolMes
 			}
 			message => {
 				let tool_type = match message {
+					Fill(_) => ToolType::Fill,
 					Rectangle(_) => ToolType::Rectangle,
 					Ellipse(_) => ToolType::Ellipse,
 					Shape(_) => ToolType::Shape,

core/editor/src/tool/tools/fill.rs

@@ -0,0 +1,43 @@
+use crate::consts::SELECTION_TOLERANCE;
+use crate::message_prelude::*;
+use crate::tool::ToolActionHandlerData;
+use document_core::Operation;
+use glam::DVec2;
+
+#[derive(Default)]
+pub struct Fill;
+
+#[impl_message(Message, ToolMessage, Fill)]
+#[derive(PartialEq, Clone, Debug)]
+pub enum FillMessage {
+	MouseDown,
+}
+
+impl<'a> MessageHandler<ToolMessage, ToolActionHandlerData<'a>> for Fill {
+	fn process_action(&mut self, _action: ToolMessage, data: ToolActionHandlerData<'a>, responses: &mut VecDeque<Message>) {
+		let mouse_pos = data.2.mouse.position;
+		let (x, y) = (mouse_pos.x as f64, mouse_pos.y as f64);
+		let (point_1, point_2) = (
+			DVec2::new(x - SELECTION_TOLERANCE, y - SELECTION_TOLERANCE),
+			DVec2::new(x + SELECTION_TOLERANCE, y + SELECTION_TOLERANCE),
+		);
+
+		let quad = [
+			DVec2::new(point_1.x, point_1.y),
+			DVec2::new(point_2.x, point_1.y),
+			DVec2::new(point_2.x, point_2.y),
+			DVec2::new(point_1.x, point_2.y),
+		];
+
+		if let Some(path) = data.0.intersects_quad_root(quad).last() {
+			responses.push_back(
+				Operation::FillLayer {
+					path: path.to_vec(),
+					color: data.1.primary_color,
+				}
+				.into(),
+			);
+		}
+	}
+	advertise_actions!(FillMessageDiscriminant; MouseDown);
+}

core/editor/src/tool/tools/mod.rs

@@ -1,5 +1,6 @@
 // already implemented
 pub mod ellipse;
+pub mod fill;
 pub mod line;
 pub mod pen;
 pub mod rectangle;

core/editor/src/tool/tools/select.rs

@@ -1,13 +1,13 @@
 use document_core::color::Color;
+use document_core::layers::style;
 use document_core::layers::style::Fill;
 use document_core::layers::style::Stroke;
-use document_core::layers::{style, SELECTION_TOLERANCE};
 use document_core::Operation;
 use glam::{DAffine2, DVec2};
 
 use crate::input::{mouse::ViewportPosition, InputPreprocessor};
 use crate::tool::{DocumentToolData, Fsm, ToolActionHandlerData};
-use crate::{message_prelude::*, SvgDocument};
+use crate::{consts::SELECTION_TOLERANCE, message_prelude::*, SvgDocument};
 
 #[derive(Default)]
 pub struct Select {