From f1542b7789fb227c59c6407c6c01cc4025436bd2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Manuel=20V=C3=B6gele?= <develop@manuel-voegele.de>
Date: Fri, 5 Feb 2021 11:11:32 +0100
Subject: [PATCH] Start measuring immediately when the token is being dragged

---
 CHANGELOG.md           |  1 +
 src/foundry_imports.js | 20 ++++++++++++++++++++
 src/main.js            |  4 ++--
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0f58c64..81409c0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 ## In development
 ### Bugfixes
 - Fixed a bug where tokens wouldn't be moved to the corect end position on gridless maps
+- Ruler now appears immediately when the token is being dragged
 
 ## v1.1.0
 ### New features
diff --git a/src/foundry_imports.js b/src/foundry_imports.js
index 2c8263b..4914389 100644
--- a/src/foundry_imports.js
+++ b/src/foundry_imports.js
@@ -74,3 +74,23 @@ function calculateTokenOffset(tokenA, tokenB) {
 function applyOffsetToRay(ray, offset) {
 	return new Ray({x: ray.A.x + offset.x, y: ray.A.y + offset.y}, {x: ray.B.x + offset.x, y: ray.B.y + offset.y})
 }
+
+// This is a modified version of Ruler._onMouseMove from foundry 0.7.9
+export function onMouseMove(event) {
+	if (this._state === Ruler.STATES.MOVING) return;
+
+	// Extract event data
+	const mt = event._measureTime || 0;
+	const { destination, originalEvent } = event.data;
+
+	// Hide any existing Token HUD
+	canvas.hud.token.clear();
+	delete event.data.hudState;
+
+	// Draw measurement updates
+	if (Date.now() - mt > 50) {
+		this.measure(destination, { gridSpaces: !originalEvent.shiftKey });
+		event._measureTime = Date.now();
+		this._state = Ruler.STATES.MEASURING;
+	}
+}
diff --git a/src/main.js b/src/main.js
index f291eaa..625c49b 100644
--- a/src/main.js
+++ b/src/main.js
@@ -1,7 +1,7 @@
 "use strict"
 
 import {availableSpeedProviders, currentSpeedProvider, registerModule, registerSystem, setCurrentSpeedProvider} from "./api.js"
-import {moveTokens} from "./foundry_imports.js"
+import {moveTokens, onMouseMove} from "./foundry_imports.js"
 import {registerSettings, settingsKey} from "./settings.js"
 
 Hooks.once("init", () => {
@@ -98,7 +98,7 @@ function onTokenLeftDragStart(event) {
 
 function onTokenLeftDragMove(event) {
 	if (canvas.controls.ruler.isDragRuler)
-		canvas.controls.ruler._onMouseMove(event)
+		onMouseMove.call(canvas.controls.ruler, event)
 }
 
 function onTokenDragLeftDrop(event) {