Use refs for non-null GraphicsContext, Scrollbar, etc. in scrollbar related code

third_party/WebKit/Source/platform/exported/WebScrollbarThemeGeometryNative.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 15 matching lines @@
 #include "config.h"
 
 #include "platform/exported/WebScrollbarThemeGeometryNative.h"
 
 #include "platform/exported/WebScrollbarThemeClientImpl.h"
 #include "platform/scroll/ScrollbarTheme.h"
 #include "public/platform/WebScrollbar.h"
 
 namespace blink {
 
-PassOwnPtr<WebScrollbarThemeGeometryNative> WebScrollbarThemeGeometryNative::create(ScrollbarTheme* theme)
+PassOwnPtr<WebScrollbarThemeGeometryNative> WebScrollbarThemeGeometryNative::create(ScrollbarTheme& theme)
 {
     return adoptPtr(new WebScrollbarThemeGeometryNative(theme));
 }
 
-WebScrollbarThemeGeometryNative::WebScrollbarThemeGeometryNative(ScrollbarTheme* theme)
+WebScrollbarThemeGeometryNative::WebScrollbarThemeGeometryNative(ScrollbarTheme& theme)
     : m_theme(theme)
 {
 }
 
 WebScrollbarThemeGeometryNative* WebScrollbarThemeGeometryNative::clone() const
 {
     return new WebScrollbarThemeGeometryNative(m_theme);
 }
 
 int WebScrollbarThemeGeometryNative::thumbPosition(WebScrollbar* scrollbar)
 {
-    WebScrollbarThemeClientImpl client(scrollbar);
-    return m_theme->thumbPosition(&client);
+    return m_theme.thumbPosition(WebScrollbarThemeClientImpl(*scrollbar));
 }
 
 int WebScrollbarThemeGeometryNative::thumbLength(WebScrollbar* scrollbar)
 {
-    WebScrollbarThemeClientImpl client(scrollbar);
-    return m_theme->thumbLength(&client);
+    return m_theme.thumbLength(WebScrollbarThemeClientImpl(*scrollbar));
 }
 
 int WebScrollbarThemeGeometryNative::trackPosition(WebScrollbar* scrollbar)
 {
-    WebScrollbarThemeClientImpl client(scrollbar);
-    return m_theme->trackPosition(&client);
+    return m_theme.trackPosition(WebScrollbarThemeClientImpl(*scrollbar));
 }
 
 int WebScrollbarThemeGeometryNative::trackLength(WebScrollbar* scrollbar)
 {
-    WebScrollbarThemeClientImpl client(scrollbar);
-    return m_theme->trackLength(&client);
+    return m_theme.trackLength(WebScrollbarThemeClientImpl(*scrollbar));
 }
 
 bool WebScrollbarThemeGeometryNative::hasButtons(WebScrollbar* scrollbar)
 {
-    WebScrollbarThemeClientImpl client(scrollbar);
-    return m_theme->hasButtons(&client);
+    return m_theme.hasButtons(WebScrollbarThemeClientImpl(*scrollbar));
 }
 
 bool WebScrollbarThemeGeometryNative::hasThumb(WebScrollbar* scrollbar)
 {
-    WebScrollbarThemeClientImpl client(scrollbar);
-    return m_theme->hasThumb(&client);
+    return m_theme.hasThumb(WebScrollbarThemeClientImpl(*scrollbar));
 }
 
 WebRect WebScrollbarThemeGeometryNative::trackRect(WebScrollbar* scrollbar)
 {
-    WebScrollbarThemeClientImpl client(scrollbar);
-    return m_theme->trackRect(&client);
+    return m_theme.trackRect(WebScrollbarThemeClientImpl(*scrollbar));
 }
 
 WebRect WebScrollbarThemeGeometryNative::thumbRect(WebScrollbar* scrollbar)
 {
-    WebScrollbarThemeClientImpl client(scrollbar);
-    return m_theme->thumbRect(&client);
+    return m_theme.thumbRect(WebScrollbarThemeClientImpl(*scrollbar));
 }
 
 int WebScrollbarThemeGeometryNative::minimumThumbLength(WebScrollbar* scrollbar)
 {
-    WebScrollbarThemeClientImpl client(scrollbar);
-    return m_theme->minimumThumbLength(&client);
+    return m_theme.minimumThumbLength(WebScrollbarThemeClientImpl(*scrollbar));
 }
 
 int WebScrollbarThemeGeometryNative::scrollbarThickness(WebScrollbar* scrollbar)
 {
-    WebScrollbarThemeClientImpl client(scrollbar);
-    return m_theme->scrollbarThickness(client.controlSize());
+    return m_theme.scrollbarThickness(WebScrollbarThemeClientImpl(*scrollbar).controlSize());
 }
 
 WebRect WebScrollbarThemeGeometryNative::backButtonStartRect(WebScrollbar* scrollbar)
 {
-    WebScrollbarThemeClientImpl client(scrollbar);
-    return m_theme->backButtonRect(&client, BackButtonStartPart, false);
+    return m_theme.backButtonRect(WebScrollbarThemeClientImpl(*scrollbar), BackButtonStartPart, false);
 }
 
 WebRect WebScrollbarThemeGeometryNative::backButtonEndRect(WebScrollbar* scrollbar)
 {
-    WebScrollbarThemeClientImpl client(scrollbar);
-    return m_theme->backButtonRect(&client, BackButtonEndPart, false);
+    return m_theme.backButtonRect(WebScrollbarThemeClientImpl(*scrollbar), BackButtonEndPart, false);
 }
 
 WebRect WebScrollbarThemeGeometryNative::forwardButtonStartRect(WebScrollbar* scrollbar)
 {
-    WebScrollbarThemeClientImpl client(scrollbar);
-    return m_theme->forwardButtonRect(&client, ForwardButtonStartPart, false);
+    return m_theme.forwardButtonRect(WebScrollbarThemeClientImpl(*scrollbar), ForwardButtonStartPart, false);
 }
 
 WebRect WebScrollbarThemeGeometryNative::forwardButtonEndRect(WebScrollbar* scrollbar)
 {
-    WebScrollbarThemeClientImpl client(scrollbar);
-    return m_theme->forwardButtonRect(&client, ForwardButtonEndPart, false);
+    return m_theme.forwardButtonRect(WebScrollbarThemeClientImpl(*scrollbar), ForwardButtonEndPart, false);
 }
 
 WebRect WebScrollbarThemeGeometryNative::constrainTrackRectToTrackPieces(WebScrollbar* scrollbar, const WebRect& rect)
 {
-    WebScrollbarThemeClientImpl client(scrollbar);
-    return m_theme->constrainTrackRectToTrackPieces(&client, IntRect(rect));
+    return m_theme.constrainTrackRectToTrackPieces(WebScrollbarThemeClientImpl(*scrollbar), IntRect(rect));
 }
 
 void WebScrollbarThemeGeometryNative::splitTrack(WebScrollbar* scrollbar, const WebRect& webTrack, WebRect& webStartTrack, WebRect& webThumb, WebRect& webEndTrack)
 {
-    WebScrollbarThemeClientImpl client(scrollbar);
     IntRect track(webTrack);
     IntRect startTrack;
     IntRect thumb;
     IntRect endTrack;
-    m_theme->splitTrack(&client, track, startTrack, thumb, endTrack);
+    m_theme.splitTrack(WebScrollbarThemeClientImpl(*scrollbar), track, startTrack, thumb, endTrack);
 
     webStartTrack = startTrack;
     webThumb = thumb;
     webEndTrack = endTrack;
 }
 
 } // namespace blink