Add implementation of WebThemeEngine for the Mac (declared by

http://webkit.org/b/51507). This allows scrollbar thumb rendering to be
overridden, so that we can match the Mac port's when running under the DRT.

BUG=23498
TEST=Layout tests
Review URL: http://codereview.chromium.org/6041005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@70278 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 58 insertions, 0 deletions

diff --git a/webkit/glue/webthemeengine_impl_mac.cc b/webkit/glue/webthemeengine_impl_mac.cc
new file mode 100644
index 0000000..ac28334
--- /dev/null
+++ b/webkit/glue/webthemeengine_impl_mac.cc
@@ -0,0 +1,58 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "webkit/glue/webthemeengine_impl_mac.h"
+
+#include <Carbon/Carbon.h>
+
+#include "third_party/WebKit/WebKit/chromium/public/WebCanvas.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebRect.h"
+
+using WebKit::WebCanvas;
+using WebKit::WebRect;
+using WebKit::WebThemeEngine;
+
+namespace webkit_glue {
+
+static ThemeTrackEnableState stateToHIEnableState(WebThemeEngine::State state) {
+  switch (state) {
+    case WebThemeEngine::StateDisabled:
+      return kThemeTrackDisabled;
+    case WebThemeEngine::StateInactive:
+      return kThemeTrackInactive;
+    default:
+      return kThemeTrackActive;
+  }
+}
+
+void WebThemeEngineImpl::paintScrollbarThumb(
+    WebCanvas* canvas,
+    WebThemeEngine::State state,
+    WebThemeEngine::Size size,
+    const WebRect& rect,
+    const WebThemeEngine::ScrollbarInfo& scrollbarInfo) {
+  HIThemeTrackDrawInfo trackInfo;
+  trackInfo.version = 0;
+  trackInfo.kind = size == WebThemeEngine::SizeRegular ?
+      kThemeMediumScrollBar : kThemeSmallScrollBar;
+  trackInfo.bounds = CGRectMake(rect.x, rect.y, rect.width, rect.height);
+  trackInfo.min = 0;
+  trackInfo.max = scrollbarInfo.maxValue;
+  trackInfo.value = scrollbarInfo.currentValue;
+  trackInfo.trackInfo.scrollbar.viewsize = scrollbarInfo.visibleSize;
+  trackInfo.attributes = 0;
+  if (scrollbarInfo.orientation ==
+      WebThemeEngine::ScrollbarOrientationHorizontal) {
+    trackInfo.attributes |= kThemeTrackHorizontal;
+  }
+
+  trackInfo.enableState = stateToHIEnableState(state);
+
+  trackInfo.trackInfo.scrollbar.pressState =
+      state == WebThemeEngine::StatePressed ? kThemeThumbPressed : 0;
+  trackInfo.attributes |= (kThemeTrackShowThumb | kThemeTrackHideTrack);
+  HIThemeDrawTrack(&trackInfo, 0, canvas, kHIThemeOrientationNormal);
+}
+
+}  // namespace webkit_glue