fix(panel): allow numbers in offset methods

Allows for numbers to be pass to the `withOffsetX` and `withOffsetY` methods, assuming that the units are pixels.

Fixes #9604.

Author: crisbeto

src/components/panel/panel.js

@@ -617,7 +617,7 @@ angular
  * @description
  * Sets the value of the offset in the x-direction.
  *
- * @param {string} offsetX
+ * @param {string|number} offsetX
  * @returns {!MdPanelPosition}
  */
 
@@ -627,7 +627,7 @@ angular
  * @description
  * Sets the value of the offset in the y-direction.
  *
- * @param {string} offsetY
+ * @param {string|number} offsetY
  * @returns {!MdPanelPosition}
  */
 
@@ -2166,23 +2166,23 @@ MdPanelPosition.prototype._validateXPosition = function(xPosition) {
 /**
  * Sets the value of the offset in the x-direction. This will add to any
  * previously set offsets.
- * @param {string|function(MdPanelPosition): string} offsetX
+ * @param {string|number|function(MdPanelPosition): string} offsetX
  * @returns {!MdPanelPosition}
  */
 MdPanelPosition.prototype.withOffsetX = function(offsetX) {
-  this._translateX.push(offsetX);
+  this._translateX.push(addUnits(offsetX));
   return this;
 };
 
 
 /**
  * Sets the value of the offset in the y-direction. This will add to any
  * previously set offsets.
- * @param {string|function(MdPanelPosition): string} offsetY
+ * @param {string|number|function(MdPanelPosition): string} offsetY
  * @returns {!MdPanelPosition}
  */
 MdPanelPosition.prototype.withOffsetY = function(offsetY) {
-  this._translateY.push(offsetY);
+  this._translateY.push(addUnits(offsetY));
   return this;
 };
 
@@ -2280,9 +2280,8 @@ MdPanelPosition.prototype.getActualPosition = function() {
 MdPanelPosition.prototype._reduceTranslateValues =
     function(translateFn, values) {
       return values.map(function(translation) {
-        // TODO(crisbeto): this should add the units after #9609 is merged.
         var translationValue = angular.isFunction(translation) ?
-            translation(this) : translation;
+            addUnits(translation(this)) : translation;
         return translateFn + '(' + translationValue + ')';
       }, this).join(' ');
     };
@@ -2719,3 +2718,12 @@ function getElement(el) {
       document.querySelector(el) : el;
   return angular.element(queryResult);
 }
+
+/**
+ * Adds units to a number value.
+ * @param {string|number} value
+ * @return {string}
+ */
+function addUnits(value) {
+  return angular.isNumber(value) ? value + 'px' : value;
+}

src/components/panel/panel.spec.js

@@ -1422,6 +1422,26 @@ describe('$mdPanel', function() {
             .toBeApproximately(middleOfPage + parseInt(offset));
       });
 
+      it('horizontally with an integer value', function() {
+        var left = '50px';
+        var offset = -15;
+
+        var position = mdPanelPosition
+            .absolute()
+            .left(left)
+            .withOffsetX(offset);
+
+        config['position'] = position;
+
+        openPanel(config);
+
+        var panelRect = document.querySelector(PANEL_EL)
+            .getBoundingClientRect();
+
+        expect(panelRect.left)
+            .toBeApproximately(parseInt(left) + offset);
+      });
+
       it('vertically', function() {
         var top = '50px';
         var offset = '-15px';
@@ -1491,6 +1511,50 @@ describe('$mdPanel', function() {
         expect(middleOfPanel)
             .toBeApproximately(middleOfPage + parseInt(offset));
       });
+
+      it('vertically with an integer value', function() {
+        var top = '50px';
+        var offset = -15;
+
+        var position = mdPanelPosition
+            .absolute()
+            .top(top)
+            .withOffsetY(offset);
+
+        config['position'] = position;
+
+        openPanel(config);
+
+        var panelRect = document.querySelector(PANEL_EL)
+            .getBoundingClientRect();
+
+        expect(panelRect.top)
+            .toBeApproximately(parseInt(top) + offset);
+      });
+
+      it('with a function that does not return units', function() {
+        var left = '50px';
+        var offset = -15;
+        var obj = {
+          getOffsetX: function() {
+            return offset;
+          }
+        };
+
+        var position = mdPanelPosition
+            .absolute()
+            .left(left)
+            .withOffsetX(obj.getOffsetX);
+
+        config['position'] = position;
+
+        openPanel(config);
+
+        var panelRect = document.querySelector(PANEL_EL)
+            .getBoundingClientRect();
+
+        expect(panelRect.left).toBeApproximately(parseInt(left) + offset);
+      });
     });
 
     describe('should absolutely position the panel at', function() {