Bug 448704 – Eliminate <gripper> as an independent element. r=vlad/dbaron/enndeakin

content/base/src/nsGkAtomList.h

@@ -377,7 +377,6 @@ GK_ATOM(functionAvailable, "function-available")
 GK_ATOM(generateId, "generate-id")
 GK_ATOM(getter, "getter")
 GK_ATOM(grid, "grid")
-GK_ATOM(gripper, "gripper")
 GK_ATOM(grippy, "grippy")
 GK_ATOM(group, "group")
 GK_ATOM(groupingSeparator, "grouping-separator")

gfx/public/nsThemeConstants.h

@@ -153,10 +153,6 @@
 #define NS_THEME_SCROLLBAR_THUMB_HORIZONTAL                88
 #define NS_THEME_SCROLLBAR_THUMB_VERTICAL                  89
 
-// The gripper that goes on the thumb
-#define NS_THEME_SCROLLBAR_GRIPPER_HORIZONTAL              90
-#define NS_THEME_SCROLLBAR_GRIPPER_VERTICAL                91
-
 // A textfield or text area
 #define NS_THEME_TEXTFIELD                                 95
 

layout/style/nsCSSKeywordList.h

@@ -532,8 +532,6 @@ CSS_KEY(scrollbartrack-horizontal, scrollbartrack_horizontal)
 CSS_KEY(scrollbartrack-vertical, scrollbartrack_vertical)
 CSS_KEY(scrollbarthumb-horizontal, scrollbarthumb_horizontal)
 CSS_KEY(scrollbarthumb-vertical, scrollbarthumb_vertical)
-CSS_KEY(scrollbargripper-horizontal, scrollbargripper_horizontal)
-CSS_KEY(scrollbargripper-vertical, scrollbargripper_vertical)
 CSS_KEY(textfield, textfield)
 CSS_KEY(textfield-multiline, textfield_multiline)
 CSS_KEY(caret, caret)

layout/style/nsCSSProps.cpp

@@ -291,8 +291,6 @@ const PRInt32 nsCSSProps::kAppearanceKTable[] = {
   eCSSKeyword_scrollbartrack_vertical,      NS_THEME_SCROLLBAR_TRACK_VERTICAL,
   eCSSKeyword_scrollbarthumb_horizontal,    NS_THEME_SCROLLBAR_THUMB_HORIZONTAL,
   eCSSKeyword_scrollbarthumb_vertical,      NS_THEME_SCROLLBAR_THUMB_VERTICAL,
-  eCSSKeyword_scrollbargripper_horizontal,  NS_THEME_SCROLLBAR_GRIPPER_HORIZONTAL,
-  eCSSKeyword_scrollbargripper_vertical,    NS_THEME_SCROLLBAR_GRIPPER_VERTICAL,
   eCSSKeyword_textfield,              NS_THEME_TEXTFIELD,
   eCSSKeyword_textfield_multiline,    NS_THEME_TEXTFIELD_MULTILINE,
   eCSSKeyword_caret,                  NS_THEME_TEXTFIELD_CARET,

toolkit/content/widgets/scrollbar.xml

@@ -5,11 +5,7 @@
    xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
    xmlns:xbl="http://www.mozilla.org/xbl">
   
-  <binding id="thumb" extends="xul:button">
+  <binding id="thumb" extends="xul:button" />
-    <content>
-      <xul:gripper/>
-    </content>
-  </binding>
 
   <binding id="scrollbar-base">
     <handlers>

toolkit/themes/winstripe/global/xulscrollbars.css

@@ -81,14 +81,6 @@ thumb[orient="horizontal"] {
   min-width: 8px;
 }
 
-thumb > gripper {
-  -moz-appearance: scrollbargripper-vertical;
-}
-
-thumb[orient="horizontal"] > gripper {
-  -moz-appearance: scrollbargripper-horizontal;
-}
-
 /* ::::: scrollbar button ::::: */
 
 scrollbarbutton {
@@ -197,14 +189,6 @@ scrollbar[orient="vertical"] > scrollbarbutton[type="decrement"][disabled="true"
     min-width: 8px;
   }
 
-  html|div thumb > gripper {
-    -moz-appearance: scrollbargripper-vertical;
-  }
-
-  html|div thumb[orient="horizontal"] > gripper {
-    -moz-appearance: scrollbargripper-horizontal;
-  }
-
   /* ::::: scrollbar button ::::: */
 
   html|div scrollbarbutton {

widget/src/gtk2/nsNativeThemeGTK.cpp

@@ -1265,8 +1265,6 @@ nsNativeThemeGTK::ThemeSupportsWidget(nsPresContext* aPresContext,
   case NS_THEME_SCROLLBAR_TRACK_VERTICAL:
   case NS_THEME_SCROLLBAR_THUMB_HORIZONTAL:
   case NS_THEME_SCROLLBAR_THUMB_VERTICAL:
-    // case NS_THEME_SCROLLBAR_GRIPPER_HORIZONTAL:  (n/a for gtk)
-    // case NS_THEME_SCROLLBAR_GRIPPER_VERTICAL:  (n/a for gtk)
   case NS_THEME_TEXTFIELD:
   case NS_THEME_TEXTFIELD_MULTILINE:
   case NS_THEME_TEXTFIELD_CARET:

widget/src/windows/nsNativeThemeWin.cpp

@@ -304,8 +304,6 @@ nsNativeThemeWin::GetTheme(PRUint8 aWidgetType)
     case NS_THEME_SCROLLBAR_BUTTON_RIGHT:
     case NS_THEME_SCROLLBAR_THUMB_VERTICAL:
     case NS_THEME_SCROLLBAR_THUMB_HORIZONTAL:
-    case NS_THEME_SCROLLBAR_GRIPPER_VERTICAL:
-    case NS_THEME_SCROLLBAR_GRIPPER_HORIZONTAL:
       return nsUXThemeData::GetTheme(eUXScrollbar);
     case NS_THEME_SCALE_HORIZONTAL:
     case NS_THEME_SCALE_VERTICAL:
@@ -615,27 +613,6 @@ nsNativeThemeWin::GetThemePartAndState(nsIFrame* aFrame, PRUint8 aWidgetType,
       }
       return NS_OK;
     }
-    case NS_THEME_SCROLLBAR_GRIPPER_VERTICAL:
-    case NS_THEME_SCROLLBAR_GRIPPER_HORIZONTAL: {
-      aPart = (aWidgetType == NS_THEME_SCROLLBAR_GRIPPER_HORIZONTAL) ?
-              SP_GRIPPERHOR : SP_GRIPPERVERT;
-      if (!aFrame)
-        aState = TS_NORMAL;
-      else if (IsDisabled(aFrame->GetParent()))
-        aState = TS_DISABLED;
-      else {
-        PRInt32 eventState = GetContentState(aFrame->GetParent(), aWidgetType);
-        if (eventState & NS_EVENT_STATE_ACTIVE) // Hover is not also a requirement for
-                                                // the gripper, since the drag is not canceled
-                                                // when you move outside the gripper.
-          aState = TS_ACTIVE;
-        else if (eventState & NS_EVENT_STATE_HOVER)
-          aState = TS_HOVER;
-        else 
-          aState = TS_NORMAL;
-      }
-      return NS_OK;
-    }
     case NS_THEME_SCALE_HORIZONTAL:
     case NS_THEME_SCALE_VERTICAL: {
       aPart = (aWidgetType == NS_THEME_SCALE_HORIZONTAL) ?
@@ -1176,6 +1153,24 @@ RENDER_AGAIN:
     widgetRect.bottom = widgetRect.top + TB_SEPARATOR_HEIGHT;
     nsUXThemeData::drawThemeEdge(theme, hdc, RP_BAND, 0, &widgetRect, EDGE_ETCHED, BF_TOP, NULL);
   }
+  else if (aWidgetType == NS_THEME_SCROLLBAR_THUMB_HORIZONTAL ||
+           aWidgetType == NS_THEME_SCROLLBAR_THUMB_VERTICAL)
+  {
+    // Draw the decorative gripper for the scrollbar thumb button, if it fits
+
+    SIZE gripSize;
+    MARGINS thumbMgns;
+    int gripPart = (aWidgetType == NS_THEME_SCROLLBAR_THUMB_HORIZONTAL) ?
+                   SP_GRIPPERHOR : SP_GRIPPERVERT;
+
+    if (nsUXThemeData::getThemePartSize(theme, hdc, gripPart, state, NULL, TS_TRUE, &gripSize) == S_OK &&
+        nsUXThemeData::getThemeMargins(theme, hdc, part, state, TMT_CONTENTMARGINS, NULL, &thumbMgns) == S_OK &&
+        gripSize.cx + thumbMgns.cxLeftWidth + thumbMgns.cxRightWidth <= widgetRect.right - widgetRect.left &&
+        gripSize.cy + thumbMgns.cyTopHeight + thumbMgns.cyBottomHeight <= widgetRect.bottom - widgetRect.top)
+    {
+      nsUXThemeData::drawThemeBG(theme, hdc, gripPart, state, &widgetRect, &clipRect);
+    }
+  }
 
   nativeDrawing.EndNativeDrawing();