Implement tool messaging and shape flipping (#288)

core/editor/src/document/document_message_handler.rs

@@ -5,7 +5,7 @@ use crate::{
 };
 use document_core::layers::Layer;
 use document_core::{DocumentResponse, LayerId, Operation as DocumentOperation};
-use glam::DAffine2;
+use glam::{DAffine2, DVec2};
 use log::warn;
 
 use crate::document::Document;
@@ -55,6 +55,7 @@ pub enum DocumentMessage {
 	SetCanvasRotation(f64),
 	NudgeSelectedLayers(f64, f64),
 	ReorderSelectedLayers(i32),
+	FlipLayer(Vec<LayerId>, bool, bool),
 }
 
 impl From<DocumentOperation> for DocumentMessage {
@@ -594,6 +595,18 @@ impl MessageHandler<DocumentMessage, &InputPreprocessor> for DocumentMessageHand
 					responses.push_back(DocumentMessage::SelectLayers(selected_layer_paths).into());
 				}
 			}
+			FlipLayer(path, flip_horizontal, flip_vertical) => {
+				if let Ok(layer) = self.active_document_mut().document.layer_mut(&path) {
+					let scale = DVec2::new(if flip_horizontal { -1. } else { 1. }, if flip_vertical { -1. } else { 1. });
+					responses.push_back(
+						DocumentOperation::SetLayerTransform {
+							path,
+							transform: (layer.transform * DAffine2::from_scale(scale)).to_cols_array(),
+						}
+						.into(),
+					);
+				}
+			}
 			message => todo!("document_action_handler does not implement: {}", message.to_discriminant().global_name()),
 		}
 	}

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

@@ -4,6 +4,7 @@ use document_core::layers::style::Fill;
 use document_core::layers::style::Stroke;
 use document_core::Operation;
 use glam::{DAffine2, DVec2};
+use serde::{Deserialize, Serialize};
 
 use crate::input::{mouse::ViewportPosition, InputPreprocessor};
 use crate::tool::{DocumentToolData, Fsm, ToolActionHandlerData};
@@ -16,12 +17,15 @@ pub struct Select {
 }
 
 #[impl_message(Message, ToolMessage, Select)]
-#[derive(PartialEq, Clone, Debug)]
+#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
 pub enum SelectMessage {
 	DragStart,
 	DragStop,
 	MouseMove,
 	Abort,
+
+	FlipHorizontal,
+	FlipVertical,
 }
 
 impl<'a> MessageHandler<ToolMessage, ToolActionHandlerData<'a>> for Select {
@@ -121,6 +125,22 @@ impl Fsm for SelectToolFsmState {
 
 					Ready
 				}
+				(_, FlipHorizontal) => {
+					let selected_layers = document.layer_data.iter().filter_map(|(path, data)| data.selected.then(|| path.clone()));
+					for path in selected_layers {
+						responses.push_back(DocumentMessage::FlipLayer(path, true, false).into());
+					}
+
+					self
+				}
+				(_, FlipVertical) => {
+					let selected_layers = document.layer_data.iter().filter_map(|(path, data)| data.selected.then(|| path.clone()));
+					for path in selected_layers {
+						responses.push_back(DocumentMessage::FlipLayer(path, false, true).into());
+					}
+
+					self
+				}
 				_ => self,
 			}
 		} else {