(G)rab, (R)otate, and (S)cale layers with hotkeys (#356)

* Add handler and input mapping.

* Selecting transform type

* Add translation and axis constraints

* Remove unnecessary Key::

* Add rotation

* Centre pivot point for rotation

* Add scaling

* Select Tool bounding box now updates when transforming

* Add typing

* Shift to slow mouse movements

* Add snapping

* Refactor modifier keys

* Refactor to apply only 1 operation per frame

* Refactor to fix scale 0 issue

* Remove logging

* Avoid multiple decimol points in queue

* Add typing negative

* Add typing negative values

* Fix bounding box on apply/abort; fix some variable names

* Allow transform to daffine2 identity

* Revert previous operation when changing operation

* Remove repopulate transforms method

* Code readability tweaks

Co-authored-by: Keavon Chambers <keavon@keavon.com>

Author: 0HyperCube

editor/src/consts.rs

@@ -15,6 +15,11 @@ pub const VIEWPORT_SCROLL_RATE: f64 = 0.6;
 
 pub const VIEWPORT_ROTATE_SNAP_INTERVAL: f64 = 15.;
 
+// TRANSFORMING LAYER
+pub const ROTATE_SNAP_ANGLE: f64 = 15.;
+pub const SCALE_SNAP_INTERVAL: f64 = 0.1;
+pub const SLOWING_DIVISOR: f64 = 10.;
+
 // SELECT TOOL
 pub const SELECTION_TOLERANCE: f64 = 1.;
 

editor/src/document/document_file.rs

@@ -18,6 +18,7 @@ use log::warn;
 use std::collections::VecDeque;
 
 use super::movement_handler::{MovementMessage, MovementMessageHandler};
+use super::transform_layer_handler::{TransformLayerMessage, TransformLayerMessageHandler};
 
 type DocumentSave = (InternalDocument, HashMap<Vec<LayerId>, LayerData>);
 
@@ -63,6 +64,7 @@ pub struct DocumentMessageHandler {
 	pub name: String,
 	pub layer_data: HashMap<Vec<LayerId>, LayerData>,
 	movement_handler: MovementMessageHandler,
+	transform_layer_handler: TransformLayerMessageHandler,
 }
 
 impl Default for DocumentMessageHandler {
@@ -74,6 +76,7 @@ impl Default for DocumentMessageHandler {
 			name: String::from("Untitled Document"),
 			layer_data: vec![(vec![], LayerData::new(true))].into_iter().collect(),
 			movement_handler: MovementMessageHandler::default(),
+			transform_layer_handler: TransformLayerMessageHandler::default(),
 		}
 	}
 }
@@ -83,6 +86,8 @@ impl Default for DocumentMessageHandler {
 pub enum DocumentMessage {
 	#[child]
 	Movement(MovementMessage),
+	#[child]
+	TransformLayers(TransformLayerMessage),
 	DispatchOperation(Box<DocumentOperation>),
 	SetSelectedLayers(Vec<Vec<LayerId>>),
 	AddSelectedLayers(Vec<Vec<LayerId>>),
@@ -260,6 +265,7 @@ impl DocumentMessageHandler {
 			name,
 			layer_data: vec![(vec![], LayerData::new(true))].into_iter().collect(),
 			movement_handler: MovementMessageHandler::default(),
+			transform_layer_handler: TransformLayerMessageHandler::default(),
 		}
 	}
 
@@ -361,6 +367,7 @@ impl MessageHandler<DocumentMessage, &InputPreprocessor> for DocumentMessageHand
 		use DocumentMessage::*;
 		match message {
 			Movement(message) => self.movement_handler.process_action(message, (layer_data(&mut self.layer_data, &[]), &self.document, ipp), responses),
+			TransformLayers(message) => self.transform_layer_handler.process_action(message, (&mut self.layer_data, &mut self.document, ipp), responses),
 			DeleteLayer(path) => responses.push_back(DocumentOperation::DeleteLayer { path }.into()),
 			StartTransaction => self.backup(),
 			RollbackTransaction => {
@@ -710,6 +717,7 @@ impl MessageHandler<DocumentMessage, &InputPreprocessor> for DocumentMessageHand
 			common.extend(select);
 		}
 		common.extend(self.movement_handler.actions());
+		common.extend(self.transform_layer_handler.actions());
 		common
 	}
 }

editor/src/document/document_message_handler.rs

@@ -1,6 +1,6 @@
 use crate::input::InputPreprocessor;
 use crate::message_prelude::*;
-use graphene::layers::{Layer, LayerDataType};
+use graphene::layers::Layer;
 use graphene::{LayerId, Operation as DocumentOperation};
 use log::warn;
 

editor/src/document/mod.rs

@@ -2,6 +2,7 @@ mod document_file;
 mod document_message_handler;
 pub mod layer_panel;
 mod movement_handler;
+mod transform_layer_handler;
 
 #[doc(inline)]
 pub use document_file::LayerData;
@@ -12,3 +13,5 @@ pub use document_file::{AlignAggregate, AlignAxis, DocumentMessage, DocumentMess
 pub use document_message_handler::{DocumentsMessage, DocumentsMessageDiscriminant, DocumentsMessageHandler};
 #[doc(inline)]
 pub use movement_handler::{MovementMessage, MovementMessageDiscriminant};
+#[doc(inline)]
+pub use transform_layer_handler::{TransformLayerMessage, TransformLayerMessageDiscriminant};