From a81a1f0b6016c272c42a1d09acee0b2822543cd1 Mon Sep 17 00:00:00 2001
From: Stewart Allen <stewart.allen@gmail.com>
Date: Thu, 20 Jan 2022 17:19:15 -0500
Subject: [PATCH] allow select, clear, toggle faces with alt and shift key
 modifiers

---
 src/main/mesh.js  |  6 ++++--
 src/mesh/model.js | 17 ++++++++++++-----
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/src/main/mesh.js b/src/main/mesh.js
index 596c0613..ce21b98b 100644
--- a/src/main/mesh.js
+++ b/src/main/mesh.js
@@ -388,7 +388,7 @@ function space_init(data) {
             }
             if (model) {
                 let group = model.group;
-                let { ctrlKey, metaKey, shiftKey } = event;
+                let { altKey, ctrlKey, metaKey, shiftKey } = event;
                 if (metaKey) {
                     // set focus on intersected face
                     let { x, y, z } = int.point;
@@ -408,7 +408,9 @@ function space_init(data) {
                         case modes.line:
                         case modes.vertex:
                             // find faces adjacent to point/line clicked
-                            model.find(int.point, int.face);
+                            model.find(int,
+                                altKey ? { toggle: true } :
+                                shiftKey ? { clear: true } : { select: true });
                             break;
                     }
                 }
diff --git a/src/mesh/model.js b/src/mesh/model.js
index 717f7bdb..0cccbc61 100644
--- a/src/mesh/model.js
+++ b/src/mesh/model.js
@@ -508,10 +508,16 @@ mesh.model = class MeshModel extends mesh.object {
         }
     }
 
-    toggleSelectedFaces(toggle = []) {
+    selectFaces(list = [], action = {}) {
         let faces = this.sel.faces;
-        for (let t of toggle) {
-            faces.remove(t) || faces.addOnce(t);
+        for (let t of list) {
+            if (action.toggle) {
+                faces.remove(t) || faces.addOnce(t);
+            } else if (action.clear) {
+                faces.remove(t);
+            } else if (action.select) {
+                faces.addOnce(t);
+            }
         }
     }
 
@@ -543,7 +549,8 @@ mesh.model = class MeshModel extends mesh.object {
     }
 
     // find adjacent faces to clicked point/line on a face
-    find(point, face) {
+    find(int, action) {
+        let { point, face } = int;
         let { x, y, z } = point;
         let { a, b, c } = face;
         worker.model_select({
@@ -552,7 +559,7 @@ mesh.model = class MeshModel extends mesh.object {
             let { faces, edges, verts, point } = data;
             // console.log({data});
             // this.toggleSelectedVertices(verts);
-            this.toggleSelectedFaces(faces);
+            this.selectFaces(faces, action);
             this.updateSelections();
         });
     }