feat(): Additional controls examples in extensions

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## [next]
 
+- feat(): Additional controls examples in extensions [#10558](https://github.com/fabricjs/fabric.js/pull/10558)
 - refactor(tests): move path tests from qunit to vitest [#10552](https://github.com/fabricjs/fabric.js/pull/10552)
 - refactor(tests): Migrate Env, ClassRegistry, Rect to vitest [#10557](https://github.com/fabricjs/fabric.js/pull/10557)
 - refactor(tests): move textbox tests from qunit to vitest [#10556](https://github.com/fabricjs/fabric.js/pull/10556)

src/controls/changeWidth.ts

@@ -1,10 +1,48 @@
 import type { TransformActionHandler } from '../EventTypeDefs';
-import { CENTER, LEFT, RESIZING, RIGHT } from '../constants';
+import { CENTER, LEFT, RESIZING, RIGHT, BOTTOM, TOP } from '../constants';
 import { resolveOrigin } from '../util/misc/resolveOrigin';
 import { getLocalPoint, isTransformCentered } from './util';
 import { wrapWithFireEvent } from './wrapWithFireEvent';
 import { wrapWithFixedAnchor } from './wrapWithFixedAnchor';
 
+const changeObjectSize =
+  (
+    originName: 'originX' | 'originY',
+    localCoord: 'x' | 'y',
+    scaleProp: 'scaleX' | 'scaleY',
+    prop: 'width' | 'height',
+  ): TransformActionHandler =>
+  (eventData, transform, x, y): boolean => {
+    const localPoint = getLocalPoint(
+      transform,
+      transform.originX,
+      transform.originY,
+      x,
+      y,
+    );
+    const coord = localPoint[localCoord];
+    const origin = resolveOrigin(transform[originName]);
+    //  make sure the control changes width ONLY from it's side of target
+    if (
+      origin === resolveOrigin(CENTER) ||
+      (origin === resolveOrigin(prop === 'width' ? RIGHT : BOTTOM) &&
+        coord < 0) ||
+      (origin === resolveOrigin(prop === 'width' ? LEFT : TOP) && coord > 0)
+    ) {
+      const { target } = transform,
+        strokePadding =
+          target.strokeWidth / (target.strokeUniform ? target[scaleProp] : 1),
+        multiplier = isTransformCentered(transform) ? 2 : 1,
+        oldSize = target[prop],
+        newSize =
+          Math.abs((coord * multiplier) / target[scaleProp]) - strokePadding;
+      target.set(prop, Math.max(newSize, 1));
+      //  check against actual target width in case `newWidth` was rejected
+      return oldSize !== target[prop];
+    }
+    return false;
+  };
+
 /**
  * Action handler to change object's width
  * Needs to be wrapped with `wrapWithFixedAnchor` to be effective
@@ -14,42 +52,35 @@ import { wrapWithFixedAnchor } from './wrapWithFixedAnchor';
  * @param {number} y current mouse y position, canvas normalized
  * @return {Boolean} true if some change happened
  */
-export const changeObjectWidth: TransformActionHandler = (
-  eventData,
-  transform,
-  x,
-  y,
-) => {
-  const localPoint = getLocalPoint(
-    transform,
-    transform.originX,
-    transform.originY,
-    x,
-    y,
-  );
-  //  make sure the control changes width ONLY from it's side of target
-  if (
-    resolveOrigin(transform.originX) === resolveOrigin(CENTER) ||
-    (resolveOrigin(transform.originX) === resolveOrigin(RIGHT) &&
-      localPoint.x < 0) ||
-    (resolveOrigin(transform.originX) === resolveOrigin(LEFT) &&
-      localPoint.x > 0)
-  ) {
-    const { target } = transform,
-      strokePadding =
-        target.strokeWidth / (target.strokeUniform ? target.scaleX : 1),
-      multiplier = isTransformCentered(transform) ? 2 : 1,
-      oldWidth = target.width,
-      newWidth =
-        Math.abs((localPoint.x * multiplier) / target.scaleX) - strokePadding;
-    target.set('width', Math.max(newWidth, 1));
-    //  check against actual target width in case `newWidth` was rejected
-    return oldWidth !== target.width;
-  }
-  return false;
-};
+export const changeObjectWidth = changeObjectSize(
+  'originX',
+  'x',
+  'scaleX',
+  'width',
+);
+
+/**
+ * Action handler to change object's height
+ * Needs to be wrapped with `wrapWithFixedAnchor` to be effective
+ * @param {Event} eventData javascript event that is doing the transform
+ * @param {Object} transform javascript object containing a series of information around the current transform
+ * @param {number} x current mouse x position, canvas normalized
+ * @param {number} y current mouse y position, canvas normalized
+ * @return {Boolean} true if some change happened
+ */
+export const changeObjectHeight = changeObjectSize(
+  'originY',
+  'y',
+  'scaleY',
+  'height',
+);
 
 export const changeWidth = wrapWithFireEvent(
   RESIZING,
   wrapWithFixedAnchor(changeObjectWidth),
 );
+
+export const changeHeight = wrapWithFireEvent(
+  RESIZING,
+  wrapWithFixedAnchor(changeObjectHeight),
+);