Bug 890195 - device-width media queries should use the page width, not the actual device width. r=bz

browser/devtools/responsivedesign/responsivedesign.jsm

@@ -171,6 +171,12 @@ function ResponsiveUI(aWindow, aTab)
   this.buildUI();
   this.checkMenus();
 
+  this.docShell = this.browser.contentWindow.QueryInterface(Ci.nsIInterfaceRequestor)
+                      .getInterface(Ci.nsIWebNavigation)
+                      .QueryInterface(Ci.nsIDocShell);
+
+  this.docShell.deviceSizeIsPageSize = true;
+
   try {
     if (Services.prefs.getBoolPref("devtools.responsiveUI.rotate")) {
       this.rotate();
@@ -208,6 +214,8 @@ ResponsiveUI.prototype = {
       return;
     this.closing = true;
 
+    this.docShell.deviceSizeIsPageSize = false;
+
     if (this._floatingScrollbars)
       switchToNativeScrollbars(this.tab);
 
@@ -241,6 +249,7 @@ ResponsiveUI.prototype = {
     this.container.removeAttribute("responsivemode");
     this.stack.removeAttribute("responsivemode");
 
+    delete this.docShell;
     delete this.tab.__responsiveUI;
     this._telemetry.toolClosed("responsive");
     ResponsiveUIManager.emit("off", this.tab, this);

browser/devtools/responsivedesign/test/Makefile.in

@@ -16,6 +16,7 @@ MOCHITEST_BROWSER_FILES := \
 		browser_responsiveruleview.js \
 		browser_responsive_cmd.js \
 		browser_responsivecomputedview.js \
+		browser_responsive_devicewidth.js \
 		head.js \
 		$(NULL)
 

browser/devtools/responsivedesign/test/browser_responsive_devicewidth.js

@@ -0,0 +1,61 @@
+/* Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  let instance;
+  let mgr = ResponsiveUI.ResponsiveUIManager;
+
+  waitForExplicitFinish();
+
+  gBrowser.selectedTab = gBrowser.addTab();
+  gBrowser.selectedBrowser.addEventListener("load", function onload() {
+    gBrowser.selectedBrowser.removeEventListener("load", onload, true);
+    waitForFocus(startTest, content);
+  }, true);
+
+  content.location = "data:text/html,mop";
+
+  function startTest() {
+    mgr.once("on", function() {executeSoon(onUIOpen)});
+    document.getElementById("Tools:ResponsiveUI").doCommand();
+  }
+
+  function onUIOpen() {
+    instance = gBrowser.selectedTab.__responsiveUI;
+    instance.stack.setAttribute("notransition", "true");
+    ok(instance, "instance of the module is attached to the tab.");
+
+    let mql = content.matchMedia("(max-device-width:100px)")
+
+    ok(!mql.matches, "media query doesn't match.");
+
+    mql.addListener(onMediaChange);
+    instance.setSize(90, 500);
+  }
+
+  function onMediaChange(mql) {
+    mql.removeListener(onMediaChange);
+    ok(mql.matches, "media query matches.");
+    ok(window.screen.width != content.screen.width, "screen.width is not the size of the screen.");
+    is(content.screen.width, 90, "screen.width is the width of the page.");
+    is(content.screen.height, 500, "screen.height is the height of the page.");
+
+
+    let docShell = content.QueryInterface(Ci.nsIInterfaceRequestor)
+                          .getInterface(Ci.nsIWebNavigation)
+                          .QueryInterface(Ci.nsIDocShell);
+
+    mql.addListener(onMediaChange2);
+    docShell.deviceSizeIsPageSize = false;
+  }
+
+  function onMediaChange2(mql) {
+    mql.removeListener(onMediaChange);
+    ok(!mql.matches, "media query has been re-evaluated.");
+    ok(window.screen.width == content.screen.width, "screen.width is not the size of the screen.");
+    instance.stack.removeAttribute("notransition");
+    document.getElementById("Tools:ResponsiveUI").doCommand();
+    gBrowser.removeCurrentTab();
+    finish();
+  }
+}

docshell/base/nsDocShell.cpp

@@ -771,6 +771,7 @@ nsDocShell::nsDocShell():
     mIsAppTab(false),
     mUseGlobalHistory(false),
     mInPrivateBrowsing(false),
+    mDeviceSizeIsPageSize(false),
     mFiredUnloadEvent(false),
     mEODForCurrentDocument(false),
     mURIResultedInDocument(false),
@@ -3930,6 +3931,27 @@ nsDocShell::GetCurrentSHEntry(nsISHEntry** aEntry, bool* aOSHE)
     return NS_OK;
 }
 
+NS_IMETHODIMP
+nsDocShell::SetDeviceSizeIsPageSize(bool aValue)
+{
+    if (mDeviceSizeIsPageSize != aValue) {
+      mDeviceSizeIsPageSize = aValue;
+      nsRefPtr<nsPresContext> presContext;
+      GetPresContext(getter_AddRefs(presContext));
+      if (presContext) {
+          presContext->MediaFeatureValuesChanged(presContext->eAlwaysRebuildStyle);
+      }
+    }
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDocShell::GetDeviceSizeIsPageSize(bool* aValue)
+{
+    *aValue = mDeviceSizeIsPageSize;
+    return NS_OK;
+}
+
 void
 nsDocShell::ClearFrameHistory(nsISHEntry* aEntry)
 {

docshell/base/nsDocShell.h

@@ -824,6 +824,7 @@ protected:
     bool                       mIsAppTab;
     bool                       mUseGlobalHistory;
     bool                       mInPrivateBrowsing;
+    bool                       mDeviceSizeIsPageSize;
 
     // This boolean is set to true right before we fire pagehide and generally
     // unset when we embed a new content viewer.  While it's true no navigation

docshell/base/nsIDocShell.idl

@@ -873,4 +873,12 @@ interface nsIDocShell : nsIDocShellTreeItem
    * Returns false for mLSHE, true for mOSHE
    */
   boolean getCurrentSHEntry(out nsISHEntry aEntry);
+
+  /**
+   * If deviceSizeIsPageSize is set to true, device-width/height media queries
+   * will be calculated from the page size, not the device size.
+   *
+   * Used by the Responsive Design View.
+   */
+  [infallible] attribute boolean deviceSizeIsPageSize;
 };

dom/base/nsScreen.cpp

@@ -387,6 +387,19 @@ nsScreen::SlowMozUnlockOrientation()
   return NS_OK;
 }
 
+bool
+nsScreen::IsDeviceSizePageSize()
+{
+  nsPIDOMWindow* owner = GetOwner();
+  if (owner) {
+    nsIDocShell* docShell = owner->GetDocShell();
+    if (docShell) {
+      return docShell->GetDeviceSizeIsPageSize();
+    }
+  }
+  return false;
+}
+
 /* virtual */
 JSObject*
 nsScreen::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aScope)

dom/base/nsScreen.h

@@ -56,6 +56,15 @@ public:
   int32_t GetWidth(ErrorResult& aRv)
   {
     nsRect rect;
+    if (IsDeviceSizePageSize()) {
+      nsCOMPtr<nsPIDOMWindow> owner = GetOwner();
+      if (owner) {
+        int32_t innerWidth = 0;
+        aRv = owner->GetInnerWidth(&innerWidth);
+        return innerWidth;
+      }
+    }
+
     aRv = GetRect(rect);
     return rect.width;
   }
@@ -63,6 +72,15 @@ public:
   int32_t GetHeight(ErrorResult& aRv)
   {
     nsRect rect;
+    if (IsDeviceSizePageSize()) {
+      nsCOMPtr<nsPIDOMWindow> owner = GetOwner();
+      if (owner) {
+        int32_t innerHeight = 0;
+        aRv = owner->GetInnerHeight(&innerHeight);
+        return innerHeight;
+      }
+    }
+
     aRv = GetRect(rect);
     return rect.height;
   }
@@ -145,6 +163,8 @@ private:
 
   LockPermission GetLockOrientationPermission() const;
 
+  bool IsDeviceSizePageSize();
+
   nsRefPtr<FullScreenEventListener> mEventListener;
 };
 

layout/base/nsPresContext.cpp

@@ -2586,6 +2586,17 @@ nsPresContext::IsCrossProcessRootContentDocument()
   return (tabChild && tabChild->IsRootContentDocument());
 }
 
+bool
+nsPresContext::IsDeviceSizePageSize()
+{
+  bool isDeviceSizePageSize = false;
+  nsCOMPtr<nsIDocShell> docShell(do_QueryReferent(mContainer));
+  if (docShell) {
+    isDeviceSizePageSize = docShell->GetDeviceSizeIsPageSize();
+  }
+  return isDeviceSizePageSize;
+}
+
 nsRootPresContext::nsRootPresContext(nsIDocument* aDocument,
                                      nsPresContextType aType)
   : nsPresContext(aDocument, aType),

layout/base/nsPresContext.h

@@ -1006,6 +1006,8 @@ public:
     mExistThrottledUpdates = aExistThrottledUpdates;
   }
 
+  bool IsDeviceSizePageSize();
+
 protected:
   friend class nsRunnableMethod<nsPresContext>;
   NS_HIDDEN_(void) ThemeChangedInternal();

layout/style/nsMediaFeatures.cpp

@@ -109,14 +109,19 @@ static nsSize
 GetDeviceSize(nsPresContext* aPresContext)
 {
     nsSize size;
-    if (aPresContext->IsRootPaginatedDocument())
+
+    if (aPresContext->IsDeviceSizePageSize()) {
+        size = GetSize(aPresContext);
+    } else if (aPresContext->IsRootPaginatedDocument()) {
         // We want the page size, including unprintable areas and margins.
         // XXX The spec actually says we want the "page sheet size", but
         // how is that different?
         size = aPresContext->GetPageSize();
-    else
+    } else {
         GetDeviceContextFor(aPresContext)->
             GetDeviceSurfaceDimensions(size.width, size.height);
+    }
+
     return size;
 }