Ensure compatibility with OS X 10.7's arrowless scrollbar. r=mstange

widget/public/nsILookAndFeel.h

@@ -43,10 +43,10 @@
   // for |#ifdef NS_DEBUG|
 struct nsSize;
 
-// 2e89c566-0a31-4c93-bdff-222651df45a0
+// 89401022-94b3-413e-a6b8-2203dab824f3
 #define NS_ILOOKANDFEEL_IID \
-{ 0x2e89c566, 0x0a31, 0x4c93, \
-  { 0xbd, 0xff, 0x22, 0x26, 0x51, 0xdf, 0x45, 0xa0 } }
+{ 0x89401022, 0x94b3, 0x413e, \
+  { 0xa6, 0xb8, 0x22, 0x03, 0xda, 0xb8, 0x24, 0xf3 } }
 
 class nsILookAndFeel: public nsISupports {
 public:
@@ -326,6 +326,7 @@ public:
   };
 
   enum {
+    eMetric_ScrollArrowNone = 0,
     eMetric_ScrollArrowStartBackward = 0x1000,
     eMetric_ScrollArrowStartForward = 0x0100,
     eMetric_ScrollArrowEndBackward = 0x0010,

widget/src/cocoa/nsLookAndFeel.mm

@@ -343,22 +343,25 @@ NS_IMETHODIMP nsLookAndFeel::GetMetric(const nsMetricID aID, PRInt32 & aMetric)
       aMetric = 4;
       break;
     case eMetric_ScrollArrowStyle:
-    {
-      NSString *buttonPlacement = [[NSUserDefaults standardUserDefaults] objectForKey:@"AppleScrollBarVariant"];
-      if ([buttonPlacement isEqualToString:@"Single"]) {
-        aMetric = eMetric_ScrollArrowStyleSingle;
-      } else if ([buttonPlacement isEqualToString:@"DoubleMin"]) {
-        aMetric = eMetric_ScrollArrowStyleBothAtTop;
-      } else if ([buttonPlacement isEqualToString:@"DoubleBoth"]) {
-        aMetric = eMetric_ScrollArrowStyleBothAtEachEnd;
+      if (nsToolkit::OnLionOrLater()) {
+        // OS X Lion's scrollbars have no arrows
+        aMetric = eMetric_ScrollArrowNone;
       } else {
-        aMetric = eMetric_ScrollArrowStyleBothAtBottom; // The default is BothAtBottom.
+        NSString *buttonPlacement = [[NSUserDefaults standardUserDefaults] objectForKey:@"AppleScrollBarVariant"];
+        if ([buttonPlacement isEqualToString:@"Single"]) {
+          aMetric = eMetric_ScrollArrowStyleSingle;
+        } else if ([buttonPlacement isEqualToString:@"DoubleMin"]) {
+          aMetric = eMetric_ScrollArrowStyleBothAtTop;
+        } else if ([buttonPlacement isEqualToString:@"DoubleBoth"]) {
+          aMetric = eMetric_ScrollArrowStyleBothAtEachEnd;
+        } else {
+          aMetric = eMetric_ScrollArrowStyleBothAtBottom; // The default is BothAtBottom.
+        }
       }
-    }
-        break;
+      break;
     case eMetric_ScrollSliderStyle:
-        aMetric = eMetric_ScrollThumbStyleProportional;
-        break;
+      aMetric = eMetric_ScrollThumbStyleProportional;
+      break;
     case eMetric_TreeOpenDelay:
       aMetric = 1000;
       break;

widget/src/cocoa/nsNativeThemeCocoa.mm

@@ -1428,9 +1428,12 @@ nsNativeThemeCocoa::GetScrollbarDrawInfo(HIThemeTrackDrawInfo& aTdi, nsIFrame *a
 
   aTdi.trackInfo.scrollbar.pressState = 0;
 
-  // Only go get these scrollbar button states if we need it. For example, there's no reaon to look up scrollbar button 
-  // states when we're only creating a TrackDrawInfo to determine the size of the thumb.
-  if (aShouldGetButtonStates) {
+  // Only go get these scrollbar button states if we need it. For example,
+  // there's no reason to look up scrollbar button states when we're only
+  // creating a TrackDrawInfo to determine the size of the thumb. There's
+  // also no reason to do this on Lion or later, whose scrollbars have no
+  // arrow buttons.
+  if (aShouldGetButtonStates && !nsToolkit::OnLionOrLater()) {
     nsEventStates buttonStates[4];
     GetScrollbarPressStates(aFrame, buttonStates);
     NSString *buttonPlacement = [[NSUserDefaults standardUserDefaults] objectForKey:@"AppleScrollBarVariant"];
@@ -2155,23 +2158,26 @@ nsNativeThemeCocoa::GetWidgetBorder(nsDeviceContext* aContext,
     case NS_THEME_SCROLLBAR_TRACK_HORIZONTAL:
     case NS_THEME_SCROLLBAR_TRACK_VERTICAL:
     {
-      // There's only an endcap to worry about when both arrows are on the bottom
-      NSString *buttonPlacement = [[NSUserDefaults standardUserDefaults] objectForKey:@"AppleScrollBarVariant"];
-      if (!buttonPlacement || [buttonPlacement isEqualToString:@"DoubleMax"]) {
-        PRBool isHorizontal = (aWidgetType == NS_THEME_SCROLLBAR_TRACK_HORIZONTAL);
+      // On Lion and later, scrollbars have no arrows.
+      if (!nsToolkit::OnLionOrLater()) {
+        // There's only an endcap to worry about when both arrows are on the bottom
+        NSString *buttonPlacement = [[NSUserDefaults standardUserDefaults] objectForKey:@"AppleScrollBarVariant"];
+        if (!buttonPlacement || [buttonPlacement isEqualToString:@"DoubleMax"]) {
+          PRBool isHorizontal = (aWidgetType == NS_THEME_SCROLLBAR_TRACK_HORIZONTAL);
 
-        nsIFrame *scrollbarFrame = GetParentScrollbarFrame(aFrame);
-        if (!scrollbarFrame) return NS_ERROR_FAILURE;
-        PRBool isSmall = (scrollbarFrame->GetStyleDisplay()->mAppearance == NS_THEME_SCROLLBAR_SMALL);
+          nsIFrame *scrollbarFrame = GetParentScrollbarFrame(aFrame);
+          if (!scrollbarFrame) return NS_ERROR_FAILURE;
+          PRBool isSmall = (scrollbarFrame->GetStyleDisplay()->mAppearance == NS_THEME_SCROLLBAR_SMALL);
 
-        // There isn't a metric for this, so just hardcode a best guess at the value.
-        // This value is even less exact due to the fact that the endcap is partially concave.
-        PRInt32 endcapSize = isSmall ? 5 : 6;
+          // There isn't a metric for this, so just hardcode a best guess at the value.
+          // This value is even less exact due to the fact that the endcap is partially concave.
+          PRInt32 endcapSize = isSmall ? 5 : 6;
 
-        if (isHorizontal)
-          aResult->SizeTo(endcapSize, 0, 0, 0);
-        else
-          aResult->SizeTo(0, endcapSize, 0, 0);
+          if (isHorizontal)
+            aResult->SizeTo(endcapSize, 0, 0, 0);
+          else
+            aResult->SizeTo(0, endcapSize, 0, 0);
+        }
       }
       break;
     }

widget/src/cocoa/nsToolkit.h

@@ -48,6 +48,7 @@
 
 #define MAC_OS_X_VERSION_10_5_HEX 0x00001050
 #define MAC_OS_X_VERSION_10_6_HEX 0x00001060
+#define MAC_OS_X_VERSION_10_7_HEX 0x00001070
 
 class nsToolkit : public nsIToolkit
 {
@@ -60,6 +61,7 @@ public:
 
   static PRInt32     OSXVersion();
   static PRBool      OnSnowLeopardOrLater();
+  static PRBool      OnLionOrLater();
 
   static void        PostSleepWakeNotification(const char* aNotification);
 

widget/src/cocoa/nsToolkit.mm

@@ -407,6 +407,11 @@ PRBool nsToolkit::OnSnowLeopardOrLater()
   return (OSXVersion() >= MAC_OS_X_VERSION_10_6_HEX);
 }
 
+PRBool nsToolkit::OnLionOrLater()
+{
+  return (OSXVersion() >= MAC_OS_X_VERSION_10_7_HEX);
+}
+
 // An alternative to [NSObject poseAsClass:] that isn't deprecated on OS X
 // Leopard and is available to 64-bit binaries on Leopard and above.  Based on
 // ideas and code from http://www.cocoadev.com/index.pl?MethodSwizzling.