Bug 475203 - regression tests for tabstrip scrolling

browser/base/content/test/Makefile.in

@@ -67,6 +67,7 @@ _BROWSER_FILES = browser_sanitize-timespans.js \
                  browser_bug405137.js \
                  browser_bug409481.js \
                  browser_bug413915.js \
+                 browser_bug419612.js \
                  browser_bug420160.js \
                  browser_bug424101.js \
                  browser_bug427559.js \
@@ -105,7 +106,7 @@ _BROWSER_FILES = browser_sanitize-timespans.js \
                  browser_bug479408.js \
                  browser_bug479408_sample.html \
                  browser_scope.js \
-                 browser_bug419612.js \
+                 browser_overflowScroll.js \
     $(NULL)
 
 ifeq (,$(filter mac cocoa,$(MOZ_WIDGET_TOOLKIT)))

browser/base/content/test/browser_overflowScroll.js

@@ -0,0 +1,69 @@
+var tabContainer = gBrowser.tabContainer;
+var tabstrip = tabContainer.mTabstrip;
+var scrollbox = tabstrip._scrollbox;
+var originalSmoothScroll = tabstrip.smoothScroll;
+
+function rect(ele)           ele.getBoundingClientRect();
+function width(ele)          rect(ele).width;
+function left(ele)           rect(ele).left;
+function right(ele)          rect(ele).right;
+function isLeft(ele, msg)    is(left(ele), left(scrollbox), msg);
+function isRight(ele, msg)   is(right(ele), right(scrollbox), msg);
+function elementFromPoint(x) tabstrip._elementFromPoint(x);
+function nextLeftElement()   elementFromPoint(left(scrollbox) - 1);
+function nextRightElement()  elementFromPoint(right(scrollbox) + 1);
+
+function test() {
+  waitForExplicitFinish();
+
+  tabstrip.smoothScroll = false;
+
+  var tabMinWidth = gPrefService.getIntPref("browser.tabs.tabMinWidth");
+  var tabCountForOverflow = Math.ceil(width(tabstrip) / tabMinWidth * 3);
+  while (tabContainer.childNodes.length < tabCountForOverflow)
+    gBrowser.addTab();
+
+  tabstrip.addEventListener("overflow", runOverflowTests, false);
+}
+
+function runOverflowTests(aEvent) {
+  if (aEvent.detail != 1)
+    return;
+
+  tabstrip.removeEventListener("overflow", runOverflowTests, false);
+
+  var upButton = tabstrip._scrollButtonUp;
+  var downButton = tabstrip._scrollButtonDown;
+  var element;
+
+  gBrowser.selectedTab = tabContainer.firstChild;
+  isLeft(tabContainer.firstChild, "Selecting the first tab scrolls it into view");
+
+  element = nextRightElement();
+  EventUtils.synthesizeMouse(downButton, 0, 0, {});
+  isRight(element, "Scrolled one tab to the right with a single click");
+
+  gBrowser.selectedTab = tabContainer.lastChild;
+  isRight(tabContainer.lastChild, "Selecting the last tab scrolls it into view");
+
+  element = nextLeftElement();
+  EventUtils.synthesizeMouse(upButton, 0, 0, {});
+  isLeft(element, "Scrolled one tab to the left with a single click");
+
+  element = elementFromPoint(left(scrollbox) - width(scrollbox));
+  EventUtils.synthesizeMouse(upButton, 0, 0, {clickCount: 2});
+  isLeft(element, "Scrolled one page of tabs with a double click");
+
+  EventUtils.synthesizeMouse(upButton, 0, 0, {clickCount: 3});
+  isLeft(tabContainer.firstChild, "Scrolled to the start with a triple click");
+
+  element = nextRightElement();
+  EventUtils.synthesizeMouseScroll(scrollbox, 0, 0, {delta: 1});
+  isRight(element, "Scrolled one tab to the right with the mouse wheel");
+
+  while (tabContainer.childNodes.length > 1)
+    gBrowser.removeTab(tabContainer.lastChild);
+
+  tabstrip.smoothScroll = originalSmoothScroll;
+  finish();
+}