Implement view hints architecture

src/ol/view.js

@@ -1,10 +1,19 @@
 goog.provide('ol.View');
+goog.provide('ol.ViewHint');
 
 goog.require('ol.IView');
 goog.require('ol.IView2D');
 goog.require('ol.IView3D');
 
 
+/**
+ * @enum {number}
+ */
+ol.ViewHint = {
+  PANNING: 0
+};
+
+
 
 /**
  * @constructor
@@ -12,10 +21,25 @@ goog.require('ol.IView3D');
  * @extends {ol.Object}
  */
 ol.View = function() {
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.hints_ = [0];
+
 };
 goog.inherits(ol.View, ol.Object);
 
 
+/**
+ * @return {Array.<number>} Hint.
+ */
+ol.View.prototype.getHints = function() {
+  return this.hints_;
+};
+
+
 /**
  * @inheritDoc
  */
@@ -27,3 +51,13 @@ ol.View.prototype.getView2D = goog.abstractMethod;
  */
 ol.View.prototype.getView3D = goog.abstractMethod;
 
+
+/**
+ * @param {ol.ViewHint} hint Hint.
+ * @param {number} delta Delta.
+ */
+ol.View.prototype.setHint = function(hint, delta) {
+  goog.asserts.assert(0 <= hint && hint < this.hints_.length);
+  this.hints_[hint] += delta;
+  goog.asserts.assert(this.hints_[hint] >= 0);
+};