first commit

node_modules/panzoom/lib/domController.js

@@ -0,0 +1,52 @@
+module.exports = makeDomController;
+
+module.exports.canAttach = isDomElement;
+
+function makeDomController(domElement, options) {
+  var elementValid = isDomElement(domElement); 
+  if (!elementValid) {
+    throw new Error('panzoom requires DOM element to be attached to the DOM tree');
+  }
+
+  var owner = domElement.parentElement;
+  domElement.scrollTop = 0;
+  
+  if (!options.disableKeyboardInteraction) {
+    owner.setAttribute('tabindex', 0);
+  }
+
+  var api = {
+    getBBox: getBBox,
+    getOwner: getOwner,
+    applyTransform: applyTransform,
+  };
+  
+  return api;
+
+  function getOwner() {
+    return owner;
+  }
+
+  function getBBox() {
+    // TODO: We should probably cache this?
+    return  {
+      left: 0,
+      top: 0,
+      width: domElement.clientWidth,
+      height: domElement.clientHeight
+    };
+  }
+
+  function applyTransform(transform) {
+    // TODO: Should we cache this?
+    domElement.style.transformOrigin = '0 0 0';
+    domElement.style.transform = 'matrix(' +
+      transform.scale + ', 0, 0, ' +
+      transform.scale + ', ' +
+      transform.x + ', ' + transform.y + ')';
+  }
+}
+
+function isDomElement(element) {
+  return element && element.parentElement && element.style;
+}