Reduce tool code duplication and boilerplate (#993)

* Reduce tool code duplication

* Add doc comments

* Fix Mac key variant, which can't be auto-converted without false positives

* Rename "key" to "keys"

---------

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

editor/src/messages/input_mapper/utility_types/input_keyboard.rs

@@ -423,6 +423,10 @@ impl<const LENGTH: usize> BitVector<LENGTH> {
 		(self.0[offset] & bit) != 0
 	}
 
+	pub fn key(&self, key: Key) -> bool {
+		self.get(key as usize)
+	}
+
 	pub fn is_empty(&self) -> bool {
 		let mut result = 0;
 

editor/src/messages/input_mapper/utility_types/input_mouse.rs

@@ -1,6 +1,10 @@
+use crate::consts::DRAG_THRESHOLD;
+use crate::messages::prelude::*;
+
 use bitflags::bitflags;
 use glam::DVec2;
 use serde::{Deserialize, Serialize};
+use std::collections::VecDeque;
 
 // Origin is top left
 pub type ViewportPosition = DVec2;
@@ -85,6 +89,13 @@ impl MouseState {
 			scroll_delta: ScrollDelta::default(),
 		}
 	}
+
+	pub fn finish_transaction(&self, drag_start: DVec2, responses: &mut VecDeque<Message>) {
+		match drag_start.distance(self.position) <= DRAG_THRESHOLD {
+			true => responses.push_back(DocumentMessage::AbortTransaction.into()),
+			false => responses.push_back(DocumentMessage::CommitTransaction.into()),
+		}
+	}
 }
 
 #[derive(Debug, Copy, Clone, Default, PartialEq, Serialize, Deserialize)]