refactor: use better mapping logic in _setupBlocksContainerEvents (#4039)

* reduce duplication

* revert a rookie error

Author: retrogtx

js/activity.js

@@ -1756,25 +1756,17 @@ class Activity {
          */
         this._setupBlocksContainerEvents = () => {
             const moving = false;
-            let lastCoords = {
-                x: 0,
-                y: 0,
-                delta: 0
-            };
-
             const that = this;
+            let lastCoords = { x: 0, y: 0, delta: 0 };
 
             /**
              * Closes any open menus and labels.
              */
             const closeAnyOpenMenusAndLabels = () => {
-                if (docById("wheelDiv") !== null) docById("wheelDiv").style.display = "none";
-                if (docById("contextWheelDiv") !== null)
-                    docById("contextWheelDiv").style.display = "none";
-                if (docById("helpfulWheelDiv") !== null)
-                    docById("helpfulWheelDiv").style.display = "none";
-                if (docById("textLabel") !== null) docById("textLabel").style.display = "none";
-                if (docById("numberLabel") !== null) docById("numberLabel").style.display = "none";
+                ['wheelDiv', 'contextWheelDiv', 'helpfulWheelDiv', 'textLabel', 'numberLabel'].forEach(id => {
+                    const elem = docById(id);
+                    if (elem) elem.style.display = 'none';
+                });
             };
 
             /**
@@ -1898,30 +1890,23 @@ class Activity {
              * @param {WheelEvent} event - The wheel event object.
              */
             const __wheelHandler = (event) => {
-                const data = normalizeWheel(event); // normalize over different browsers
+                const data = normalizeWheel(event);
                 const delY = data.pixelY;
                 const delX = data.pixelX;
-               
-                //Ctrl+MouseWheel Zoom functionality
+    
                 if (event.ctrlKey) {
-                    event.preventDefault(); // Prevent default scrolling behavior
-                   
-                    if (delY < 0 && doLargerBlocks(this));//Zoom IN
-                    if (delY >= 0 && doSmallerBlocks(this));//Zoom Out
-                }
-                if (delY !== 0 && event.axis === event.VERTICAL_AXIS) {
-                    closeAnyOpenMenusAndLabels(); // closes all wheelnavs when scrolling .
+                    event.preventDefault();
+                    delY < 0 ? doLargerBlocks(that) : doSmallerBlocks(that);
+                } else if (delY !== 0 && event.axis === event.VERTICAL_AXIS) {
+                    closeAnyOpenMenusAndLabels();
                     that.blocksContainer.y -= delY;
-                }
-                // horizontal scroll
-                if (that.scrollBlockContainer) {
-                    if (delX !== 0 && event.axis === event.HORIZONTAL_AXIS) {
-                        closeAnyOpenMenusAndLabels();
-                        that.blocksContainer.x -= delX;
-                    }
+                } else if (that.scrollBlockContainer && delX !== 0 && event.axis === event.HORIZONTAL_AXIS) {
+                    closeAnyOpenMenusAndLabels();
+                    that.blocksContainer.x -= delX;
                 } else {
                     event.preventDefault();
                 }
+    
                 that.refreshCanvas();
             };
 
@@ -1973,12 +1958,10 @@ class Activity {
 
                 that.stage.removeAllEventListeners("stagemousemove");
                 that.stage.on("stagemousemove", (event) => {
-                    that.stageX = event.stageX;
-                    that.stageY = event.stageY;
-
-                    if (!moving) {
-                        return;
-                    }
+                    that.stageX = moveEvent.stageX;
+                    that.stageY = moveEvent.stageY;
+    
+                    if (!that.moving) return;
 
                     // if we are moving the block container, deselect the active block.
                     // Deselect active block if moving the block container
@@ -4182,7 +4165,7 @@ class Activity {
                     let st = sched[j].start;
                     let ed= sched[j].end;
                     let dur = ed - st;
-                    var temp = this.getClosestStandardNoteValue(dur * 3 / 8);
+                    let temp = this.getClosestStandardNoteValue(dur * 3 / 8);
                     shortestNoteDenominator=Math.max(shortestNoteDenominator,temp[1]);
                 }
 
@@ -4224,7 +4207,7 @@ class Activity {
                         }
                         return ar;
                     };
-                    var obj = this.getClosestStandardNoteValue(duration * 3 / 8);
+                    let obj = this.getClosestStandardNoteValue(duration * 3 / 8);
                     // let scalingFactor=1;
                     // if(shortestNoteDenominator>32)
                     // scalingFactor=shortestNoteDenominator/32;