From b353f83e09769bdaafc2c2377d8b09e5450b1f5e Mon Sep 17 00:00:00 2001
From: yiinho <yiinho@google.com>
Date: Tue, 18 Oct 2016 15:14:35 -0700
Subject: [PATCH] Add class to disable js layout switching

This is helpful when using MDL with other frameworks that provide routing such as Angular2.
---
 src/layout/layout.js | 16 ++++++++++------
 test/unit/layout.js  | 45 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+), 6 deletions(-)

diff --git a/src/layout/layout.js b/src/layout/layout.js
index 9e1e4e68..a1cc1dcd 100644
--- a/src/layout/layout.js
+++ b/src/layout/layout.js
@@ -110,6 +110,7 @@
     TAB_BAR_BUTTON: 'mdl-layout__tab-bar-button',
     TAB_BAR_LEFT_BUTTON: 'mdl-layout__tab-bar-left-button',
     TAB_BAR_RIGHT_BUTTON: 'mdl-layout__tab-bar-right-button',
+    TAB_MANUAL_SWITCH: 'mdl-layout__tab-manual-switch',
     PANEL: 'mdl-layout__tab-panel',
 
     HAS_DRAWER: 'has-drawer',
@@ -549,12 +550,15 @@
       tab.appendChild(rippleContainer);
     }
 
-    tab.addEventListener('click', function(e) {
-      if (tab.getAttribute('href').charAt(0) === '#') {
-        e.preventDefault();
-        selectTab();
-      }
-    });
+    if (!layout.tabBar_.classList.contains(
+      layout.CssClasses_.TAB_MANUAL_SWITCH)) {
+      tab.addEventListener('click', function(e) {
+        if (tab.getAttribute('href').charAt(0) === '#') {
+          e.preventDefault();
+          selectTab();
+        }
+      });
+    }
 
     tab.show = selectTab;
   }
diff --git a/test/unit/layout.js b/test/unit/layout.js
index 8a9d53bf..f5a8bdb0 100644
--- a/test/unit/layout.js
+++ b/test/unit/layout.js
@@ -151,4 +151,49 @@ describe('MaterialLayout', function () {
       expect($(drawerBtn)).to.have.attr('aria-expanded', 'false');
     });
   });
+
+  describe('Manual switch mode', function () {
+    it('should disable content switching', function (done) {
+      var el = document.createElement('div');
+      el.innerHTML = '' +
+        '  <header class="mdl-layout__header">' +
+        '    <div class="mdl-layout__tab-bar mdl-js-ripple-effect mdl-layout__tab-manual-switch">' +
+        '      <a id="tab1" href="#scroll-tab-1" class="mdl-layout__tab is-active">Tab 1</a>' +
+        '      <a id="tab2" href="#scroll-tab-2" class="mdl-layout__tab">Tab 2</a>' +
+        '    </div>' +
+        '  </header>' +
+        '  <main class="mdl-layout__content">' +
+        '    <section class="mdl-layout__tab-panel is-active" id="scroll-tab-1">' +
+        '      <div class="page-content"><!-- Your content goes here --></div>' +
+        '    </section>' +
+        '    <section class="mdl-layout__tab-panel" id="scroll-tab-2">' +
+        '      <div class="page-content"><!-- Your content goes here --></div>' +
+        '    </section>' +
+        '  </main>';
+
+      var parent = document.createElement('div');
+      parent.appendChild(el); // MaterialLayout.init() expects a parent
+
+      var tab1 = el.querySelector('#tab1');
+      var tab2 = el.querySelector('#tab2');
+      var content1 = el.querySelector('#scroll-tab-1');
+      var content2 = el.querySelector('#scroll-tab-2');
+
+      componentHandler.upgradeElement(el, 'MaterialLayout');
+
+      var ev = document.createEvent('MouseEvents');
+      ev.initEvent('click', true, true);
+      tab2.dispatchEvent(ev);
+
+      window.setTimeout(function() {
+        // Since content switching has been set to manual, layout shouldn't
+        // have been switched.
+        expect($(tab1)).to.have.class('is-active');
+        expect($(content1)).to.have.class('is-active');
+        expect($(tab2)).to.not.have.class('is-active');
+        expect($(content2)).to.not.have.class('is-active');
+        done();
+      }, 100);
+    });
+  });
 });