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gaia/distros/spark/apps/studio/js/navigation.js

@@ -0,0 +1,64 @@
+/* global
+  Defer,
+  Main
+*/
+
+(function(exports) {
+  'use strict';
+
+  var stack = [Main.prepareForDisplay()];
+
+  exports.Navigation = {
+    waitForTransition() {
+      var defer = new Defer();
+
+      var count = 2;
+      document.body.addEventListener('transitionend', function onTransition(e) {
+        if (!e.target.classList.contains('panel')) {
+          return;
+        }
+
+        if (--count) {
+          return;
+        }
+
+        document.body.removeEventListener('transitionend', onTransition);
+        defer.resolve();
+      });
+
+      return defer.promise;
+    },
+
+    push: function(panel) {
+      return Promise.resolve(panel).then((panel) => {
+        stack[stack.length - 1].classList.add('back');
+        panel.classList.remove('next');
+        stack.push(panel);
+
+        return this.waitForTransition();
+      });
+    },
+
+    pop: function() {
+      var toPop = stack.pop();
+      toPop.classList.add('next');
+      var toDisplay = stack[stack.length - 1];
+      toDisplay.classList.remove('back');
+
+      return this.waitForTransition().then(() => {
+        toPop.dispatchEvent(new CustomEvent('Navigation:pop'));
+        toDisplay.dispatchEvent(new CustomEvent('Navigation:display'));
+      });
+    },
+
+    popToRoot: function() {
+      if (stack.length == 1) {
+        return Promise.resolve();
+      }
+
+      return this.pop().then(() => {
+        return this.popToRoot();
+      });
+    }
+  };
+})(window);